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"},365:function(t,s,a){t.exports=a.p+"assets/img/ambient_diffuse_specular_lighting.76386148.png"},366:function(t,s,a){t.exports=a.p+"assets/img/specular_lighting.b3869eb1.png"},367:function(t,s,a){t.exports=a.p+"assets/img/half_dir.bbcc23b8.png"},443:function(t,s,a){"use strict";a.r(s);var n=a(7),e=Object(n.a)({},(function(){var t=this,s=t._self._c;return s("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[s("h1",{attrs:{id:"working-with-lights"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#working-with-lights"}},[t._v("#")]),t._v(" Working with Lights")]),t._v(" "),s("p",[t._v("While we can tell our scene is 3D because of our camera, it still feels very flat. That's because our model stays the same color regardless of its orientation. If we want to change that, we need to add lighting to our scene.")]),t._v(" "),s("p",[t._v("In the real world, a light source emits photons that bounce around until they enter our eyes. The color we see is the light's original color minus whatever energy it lost while bouncing around.")]),t._v(" "),s("p",[t._v("In the computer graphics world, modeling individual photons would be hilariously computationally expensive. A single 100 Watt light bulb emits about 3.27 x 10^20 photons "),s("em",[t._v("per second")]),t._v(". Just imagine that for the sun! To get around this, we're going to use math to cheat.")]),t._v(" "),s("p",[t._v("Let's discuss a few options.")]),t._v(" "),s("h2",{attrs:{id:"ray-path-tracing"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#ray-path-tracing"}},[t._v("#")]),t._v(" Ray/Path Tracing")]),t._v(" "),s("p",[t._v("This is an "),s("em",[t._v("advanced")]),t._v(" topic, and we won't be covering it in depth here. It's the closest model to the way light really works so I felt I had to mention it. Check out the "),s("RouterLink",{attrs:{to:"/todo/"}},[t._v("ray tracing tutorial")]),t._v(" if you want to learn more.")],1),t._v(" "),s("h2",{attrs:{id:"the-blinn-phong-model"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#the-blinn-phong-model"}},[t._v("#")]),t._v(" The Blinn-Phong Model")]),t._v(" "),s("p",[t._v("Ray/path tracing is often too computationally expensive for most real-time applications (though that is starting to change), so a more efficient, if less accurate method based on the "),s("a",{attrs:{href:"https://en.wikipedia.org/wiki/Phong_shading",target:"_blank",rel:"noopener noreferrer"}},[t._v("Phong reflection model"),s("OutboundLink")],1),t._v(" is often used. It splits up the lighting calculation into three parts: ambient lighting, diffuse lighting, and specular lighting. 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This will involve creating an "),s("code",[t._v("")]),t._v(" tag in Rust to get the image and then a "),s("code",[t._v("")]),t._v(" to get the pixel data, but I'll leave this as an exercise for the reader.")])]),t._v(" "),s("p",[t._v("In "),s("code",[t._v("State")]),t._v("'s "),s("code",[t._v("new()")]),t._v(" method, add the following just after configuring the "),s("code",[t._v("surface")]),t._v(":")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[t._v("surface"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("configure")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("device"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("config"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// NEW!")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" diffuse_bytes "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token macro property"}},[t._v("include_bytes!")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"happy-tree.png"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" diffuse_image "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("image"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("load_from_memory")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("diffuse_bytes"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" diffuse_rgba "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" diffuse_image"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_rgba8")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("use")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("image"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("GenericImageView")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" dimensions "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" diffuse_image"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("dimensions")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),s("p",[t._v("Here, we grab the bytes from our image file and load them into an image, which is then converted into a "),s("code",[t._v("Vec")]),t._v(" of RGBA bytes. We also save the image's dimensions for when we create the actual "),s("code",[t._v("Texture")]),t._v(".")]),t._v(" "),s("p",[t._v("Now, let's create the "),s("code",[t._v("Texture")]),t._v(":")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" texture_size "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Extent3d")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n width"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" dimensions"),s("span",{pre:!0,attrs:{class:"token number"}},[t._v(".0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n 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"),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TextureDescriptor")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// All textures are stored as 3D, we represent our 2D texture")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// by setting depth to 1.")]),t._v("\n size"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" texture_size"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n mip_level_count"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// We'll talk about this a little later")]),t._v("\n sample_count"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n dimension"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TextureDimension")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("D2")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Most images are stored using sRGB, so we need to reflect that here.")]),t._v("\n format"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TextureFormat")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Rgba8UnormSrgb")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// TEXTURE_BINDING tells wgpu that we want to use this texture in shaders")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// COPY_DST means that we want to copy data to this texture")]),t._v("\n usage"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token 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It")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// specifies what texture formats can be used to")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create TextureViews for this texture. The base")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// texture format (Rgba8UnormSrgb in this case) is")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// always supported. Note that using a different")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// texture format is not supported on the WebGL2")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// backend.")]),t._v("\n view_formats"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),s("h2",{attrs:{id:"getting-data-into-a-texture"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#getting-data-into-a-texture"}},[t._v("#")]),t._v(" Getting data into a Texture")]),t._v(" "),s("p",[t._v("The "),s("code",[t._v("Texture")]),t._v(" struct has no methods to interact with the data directly. However, we can use a method on the "),s("code",[t._v("queue")]),t._v(" we created earlier called "),s("code",[t._v("write_texture")]),t._v(" to load in the texture. Let's take a look at how we do that:")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[t._v("queue"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("write_texture")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Tells wgpu where to copy the pixel data")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("ImageCopyTexture")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n texture"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("diffuse_texture"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n mip_level"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n origin"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Origin3d")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("ZERO")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n aspect"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TextureAspect")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("All")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// The actual pixel data")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("diffuse_rgba"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// The layout of the texture")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("ImageDataLayout")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n offset"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n bytes_per_row"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("4")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("*")]),t._v(" dimensions"),s("span",{pre:!0,attrs:{class:"token number"}},[t._v(".0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n rows_per_image"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("dimensions"),s("span",{pre:!0,attrs:{class:"token number"}},[t._v(".1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n texture_size"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),s("div",{staticClass:"note"},[s("p",[t._v("The old way of writing data to a texture was to copy the pixel data to a buffer and then copy it to the texture. 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This value needs to be a multiple of 256. Check out "),s("RouterLink",{attrs:{to:"/showcase/gifs/#how-do-we-make-the-frames"}},[t._v("the gif tutorial")]),t._v(" for more details.")],1)]),t._v(" "),s("h2",{attrs:{id:"textureviews-and-samplers"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#textureviews-and-samplers"}},[t._v("#")]),t._v(" TextureViews and Samplers")]),t._v(" "),s("p",[t._v("Now that our texture has data in it, we need a way to use it. This is where a "),s("code",[t._v("TextureView")]),t._v(" and a "),s("code",[t._v("Sampler")]),t._v(" come in. A "),s("code",[t._v("TextureView")]),t._v(" offers us a "),s("em",[t._v("view")]),t._v(" into our texture. A "),s("code",[t._v("Sampler")]),t._v(" controls how the "),s("code",[t._v("Texture")]),t._v(" is "),s("em",[t._v("sampled")]),t._v(". Sampling works similar to the eyedropper tool in GIMP/Photoshop. 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While we can make a game with just triangles, trying to draw highly detailed objects would massively limit what devices could even run our game. However, we can get around this problem with "),s("strong",[t._v("textures")]),t._v(".")]),t._v(" "),s("p",[t._v("Textures are images overlaid on a triangle mesh to make it seem more detailed. There are multiple types of textures, such as normal maps, bump maps, specular maps, and diffuse maps. We're going to talk about diffuse maps or, more simply, the color texture.")]),t._v(" "),s("h2",{attrs:{id:"loading-an-image-from-a-file"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#loading-an-image-from-a-file"}},[t._v("#")]),t._v(" Loading an image from a file")]),t._v(" "),s("p",[t._v("If we want to map an image to our mesh, we first need an image. 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Let's add it to our dependencies:")]),t._v(" "),s("div",{staticClass:"language-toml extra-class"},[s("pre",{pre:!0,attrs:{class:"language-toml"}},[s("code",[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token table class-name"}},[t._v("dependencies.image")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token key property"}},[t._v("version")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"0.24"')]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token key property"}},[t._v("default-features")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token boolean"}},[t._v("false")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token key property"}},[t._v("features")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"png"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"jpeg"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n")])])]),s("p",[t._v("The jpeg decoder that "),s("code",[t._v("image")]),t._v(" includes uses "),s("a",{attrs:{href:"https://docs.rs/rayon",target:"_blank",rel:"noopener noreferrer"}},[t._v("rayon"),s("OutboundLink")],1),t._v(" to speed up the decoding with threads. WASM doesn't support threads currently, so we need to disable this so our code won't crash when we try to load a jpeg on the web.")]),t._v(" "),s("div",{staticClass:"note"},[s("p",[t._v("Decoding jpegs in WASM isn't very performant. If you want to speed up image loading in general in WASM, you could opt to use the browser's built-in decoders instead of "),s("code",[t._v("image")]),t._v(" when building with "),s("code",[t._v("wasm-bindgen")]),t._v(". This will involve creating an "),s("code",[t._v("")]),t._v(" tag in Rust to get the image and then a "),s("code",[t._v("")]),t._v(" to get the pixel data, but I'll leave this as an exercise for the reader.")])]),t._v(" "),s("p",[t._v("In "),s("code",[t._v("State")]),t._v("'s "),s("code",[t._v("new()")]),t._v(" method, add the following just after configuring the "),s("code",[t._v("surface")]),t._v(":")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[t._v("surface"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("configure")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("device"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("config"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// NEW!")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" diffuse_bytes "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token macro property"}},[t._v("include_bytes!")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"happy-tree.png"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" diffuse_image "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("image"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("load_from_memory")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("diffuse_bytes"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" diffuse_rgba "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" diffuse_image"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_rgba8")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("use")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("image"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("GenericImageView")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" dimensions "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" diffuse_image"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("dimensions")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),s("p",[t._v("Here, we grab the bytes from our image file and load them into an image, which is then converted into a "),s("code",[t._v("Vec")]),t._v(" of RGBA bytes. 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"),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TextureDescriptor")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// All textures are stored as 3D, we represent our 2D texture")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// by setting depth to 1.")]),t._v("\n size"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" texture_size"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n mip_level_count"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// We'll talk about this a little later")]),t._v("\n sample_count"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n dimension"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TextureDimension")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("D2")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Most images are stored using sRGB, so we need to reflect that here.")]),t._v("\n 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It")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// specifies what texture formats can be used to")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create TextureViews for this texture. The base")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// texture format (Rgba8UnormSrgb in this case) is")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// always supported. 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However, we can use a method on the "),s("code",[t._v("queue")]),t._v(" we created earlier called "),s("code",[t._v("write_texture")]),t._v(" to load in the texture. Let's take a look at how we do that:")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[t._v("queue"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("write_texture")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Tells wgpu where to copy the pixel data")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("ImageCopyTexture")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n texture"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("diffuse_texture"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n mip_level"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n origin"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Origin3d")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("ZERO")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n aspect"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TextureAspect")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("All")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// The actual pixel data")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("diffuse_rgba"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// The layout of the texture")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("ImageDataLayout")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n offset"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n bytes_per_row"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("4")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("*")]),t._v(" dimensions"),s("span",{pre:!0,attrs:{class:"token number"}},[t._v(".0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n rows_per_image"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("dimensions"),s("span",{pre:!0,attrs:{class:"token number"}},[t._v(".1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n texture_size"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),s("div",{staticClass:"note"},[s("p",[t._v("The old way of writing data to a texture was to copy the pixel data to a buffer and then copy it to the texture. 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strict";a.r(s);var n=a(7),e=Object(n.a)({},(function(){var t=this,s=t._self._c;return s("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[s("h1",{attrs:{id:"buffers-and-indices"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#buffers-and-indices"}},[t._v("#")]),t._v(" Buffers and Indices")]),t._v(" "),s("h2",{attrs:{id:"we-re-finally-talking-about-them"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#we-re-finally-talking-about-them"}},[t._v("#")]),t._v(" We're finally talking about them!")]),t._v(" "),s("p",[t._v("You were probably getting sick of me saying stuff like, \"We'll get to that when we talk about buffers\". Well, now's the time to finally talk about buffers, but first...")]),t._v(" "),s("h2",{attrs:{id:"what-is-a-buffer"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#what-is-a-buffer"}},[t._v("#")]),t._v(" What is a buffer?")]),t._v(" "),s("p",[t._v("A buffer is a blob of data on the GPU. A buffer is guaranteed to be contiguous, meaning that all the data is stored sequentially in memory. Buffers are generally used to store simple things like structs or arrays, but they can store more complex stuff such as graph structures like trees (provided all the nodes are stored together and don't reference anything outside the buffer). We are going to use buffers a lot, so let's get started with two of the most important ones: the vertex buffer and the index buffer.")]),t._v(" "),s("h2",{attrs:{id:"the-vertex-buffer"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#the-vertex-buffer"}},[t._v("#")]),t._v(" The vertex buffer")]),t._v(" "),s("p",[t._v("Previously, we've stored vertex data directly in the vertex shader. While that worked fine to get our bootstraps on, it simply won't do for the long term. The types of objects we need to draw will vary in size, and recompiling the shader whenever we need to update the model would massively slow down our program. Instead, we are going to use buffers to store the vertex data we want to draw. Before we do that, though, we need to describe what a vertex looks like. 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You can only have one index buffer set at a time.")]),t._v(" "),s("li",[t._v("When using an index buffer, you need to use "),s("code",[t._v("draw_indexed")]),t._v(". The "),s("code",[t._v("draw")]),t._v(" method ignores the index buffer. Also, make sure you use the number of indices ("),s("code",[t._v("num_indices")]),t._v("), not vertices, as your model will either draw wrong or the method will "),s("code",[t._v("panic")]),t._v(" because there are not enough indices.")])]),t._v(" "),s("p",[t._v("With all that you should have a garishly magenta pentagon in your window.")]),t._v(" "),s("p",[s("img",{attrs:{src:a(333),alt:"Magenta pentagon in window"}})]),t._v(" "),s("h2",{attrs:{id:"color-correction"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#color-correction"}},[t._v("#")]),t._v(" Color Correction")]),t._v(" "),s("p",[t._v("If you use a color picker on the magenta pentagon, you'll get a hex value of #BC00BC. If you convert this to RGB values, you'll get (188, 0, 188). Dividing these values by 255 to get them into the [0, 1] range, we get roughly (0.737254902, 0, 0.737254902). This is not the same as what we are using for our vertex colors, which is (0.5, 0.0, 0.5). The reason for this has to do with color spaces.")]),t._v(" "),s("p",[t._v("Most monitors use a color space known as sRGB. Our surface is (most likely depending on what is returned from "),s("code",[t._v("surface.get_preferred_format()")]),t._v(") using an sRGB texture format. The sRGB format stores colors according to their relative brightness instead of their actual brightness. The reason for this is that our eyes don't perceive light linearly. We notice more differences in darker colors than in lighter colors.")]),t._v(" "),s("p",[t._v("You get the correct color using the following formula: "),s("code",[t._v("srgb_color = ((rgb_color / 255 + 0.055) / 1.055) ^ 2.4")]),t._v(". Doing this with an RGB value of (188, 0, 188) will give us (0.5028864580325687, 0.0, 0.5028864580325687). A little off from our (0.5, 0.0, 0.5). Instead of doing a manual color conversion, you'll likely save a lot of time by using textures instead, as they are stored as sRGB by default, so they don't suffer from the same color inaccuracies that vertex colors do. We'll cover textures in the next lesson.")]),t._v(" "),s("h2",{attrs:{id:"challenge"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#challenge"}},[t._v("#")]),t._v(" Challenge")]),t._v(" "),s("p",[t._v("Create a more complex shape than the one we made (aka. more than three triangles) using a vertex buffer and an index buffer. Toggle between the two with the space key.")]),t._v(" "),s("WasmExample",{attrs:{example:"tutorial4_buffer"}}),t._v(" "),s("AutoGithubLink")],1)}),[],!1,null,null,null);s.default=e.exports}}]); \ No newline at end of file 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strict";a.r(s);var n=a(7),e=Object(n.a)({},(function(){var t=this,s=t._self._c;return s("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[s("h1",{attrs:{id:"buffers-and-indices"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#buffers-and-indices"}},[t._v("#")]),t._v(" Buffers and Indices")]),t._v(" "),s("h2",{attrs:{id:"we-re-finally-talking-about-them"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#we-re-finally-talking-about-them"}},[t._v("#")]),t._v(" We're finally talking about them!")]),t._v(" "),s("p",[t._v("You were probably getting sick of me saying stuff like, \"We'll get to that when we talk about buffers\". Well, now's the time to finally talk about buffers, but first...")]),t._v(" "),s("h2",{attrs:{id:"what-is-a-buffer"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#what-is-a-buffer"}},[t._v("#")]),t._v(" What is a buffer?")]),t._v(" "),s("p",[t._v("A buffer is a blob of data on the GPU. A buffer is guaranteed to be contiguous, meaning that all the data is stored sequentially in memory. Buffers are generally used to store simple things like structs or arrays, but they can store more complex stuff such as graph structures like trees (provided all the nodes are stored together and don't reference anything outside the buffer). We are going to use buffers a lot, so let's get started with two of the most important ones: the vertex buffer and the index buffer.")]),t._v(" "),s("h2",{attrs:{id:"the-vertex-buffer"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#the-vertex-buffer"}},[t._v("#")]),t._v(" The vertex buffer")]),t._v(" "),s("p",[t._v("Previously, we've stored vertex data directly in the vertex shader. While that worked fine to get our bootstraps on, it simply won't do for the long term. The types of objects we need to draw will vary in size, and recompiling the shader whenever we need to update the model would massively slow down our program. Instead, we are going to use buffers to store the vertex data we want to draw. Before we do that, though, we need to describe what a vertex looks like. 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You can only have one index buffer set at a time.")]),t._v(" "),s("li",[t._v("When using an index buffer, you need to use "),s("code",[t._v("draw_indexed")]),t._v(". The "),s("code",[t._v("draw")]),t._v(" method ignores the index buffer. Also, make sure you use the number of indices ("),s("code",[t._v("num_indices")]),t._v("), not vertices, as your model will either draw wrong or the method will "),s("code",[t._v("panic")]),t._v(" because there are not enough indices.")])]),t._v(" "),s("p",[t._v("With all that you should have a garishly magenta pentagon in your window.")]),t._v(" "),s("p",[s("img",{attrs:{src:a(335),alt:"Magenta pentagon in window"}})]),t._v(" "),s("h2",{attrs:{id:"color-correction"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#color-correction"}},[t._v("#")]),t._v(" Color Correction")]),t._v(" "),s("p",[t._v("If you use a color picker on the magenta pentagon, you'll get a hex value of #BC00BC. If you convert this to RGB values, you'll get (188, 0, 188). 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A little off from our (0.5, 0.0, 0.5). Instead of doing a manual color conversion, you'll likely save a lot of time by using textures instead, as they are stored as sRGB by default, so they don't suffer from the same color inaccuracies that vertex colors do. We'll cover textures in the next lesson.")]),t._v(" "),s("h2",{attrs:{id:"challenge"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#challenge"}},[t._v("#")]),t._v(" Challenge")]),t._v(" "),s("p",[t._v("Create a more complex shape than the one we made (aka. more than three triangles) using a vertex buffer and an index buffer. 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This is great when you want to get your shading code just right, but most applications will want to fill the screen with more interesting things. You could approach this in a variety of ways. You could create a bunch of models in Blender and load them into the scene. This method works great if you have some decent artistic skills and some patience. I'm lacking in both those departments, so let's write some code to make something that looks nice.")]),t._v(" "),a("p",[t._v("As the name of this article suggests, we're going to create a terrain. Now, the traditional method to create a terrain mesh is to use a pre-generated noise texture and sample it to get the height values at each point in the mesh. This is a valid approach, but I opted to generate the noise using a compute shader directly. 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I'll admit to not really understanding the math behind OpenSimplex noise. The basics are that it's similar to Perlin Noise, but instead of a square grid, it's a hexagonal grid that removes some of the artifacts that generating the noise on a square grid gets you. Again, I'm not an expert on this, so to summarize: "),a("code",[t._v("permute3()")]),t._v(" takes a "),a("code",[t._v("vec3")]),t._v(" and returns a pseudorandom "),a("code",[t._v("vec3")]),t._v(", "),a("code",[t._v("snoise2()")]),t._v(" takes a "),a("code",[t._v("vec2")]),t._v(" and returns a floating point number between [-1, 1]. If you want to learn more about noise functions, check out "),a("a",{attrs:{href:"https://thebookofshaders.com/11/",target:"_blank",rel:"noopener noreferrer"}},[t._v("this article from The Book of Shaders"),a("OutboundLink")],1),t._v(". The code's in GLSL, but the concepts are the same.")]),t._v(" "),a("p",[t._v("While we can use the output of "),a("code",[t._v("snoise")]),t._v(" directly to generate the terrain's height values, the result of this tends to be very smooth, which may be what you want, but it doesn't look very organic, as you can see below:")]),t._v(" "),a("p",[a("img",{attrs:{src:s(377),alt:"smooth terrain"}})]),t._v(" "),a("p",[t._v("To make the terrain a bit rougher, we're going to use a technique called "),a("a",{attrs:{href:"https://thebookofshaders.com/13/",target:"_blank",rel:"noopener noreferrer"}},[t._v("Fractal Brownian Motion"),a("OutboundLink")],1),t._v(". This technique works by sampling the noise function multiple times, cutting the strength in half each time while doubling the frequency of the noise. This means that the overall shape of the terrain will be fairly smooth, but it will have sharper details. You can see what that will look like below:")]),t._v(" "),a("p",[a("img",{attrs:{src:s(378),alt:"more organic terrain"}})]),t._v(" "),a("p",[t._v("The code for this function is actually quite simple:")]),t._v(" "),a("div",{staticClass:"language-wgsl extra-class"},[a("pre",{pre:!0,attrs:{class:"language-wgsl"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token functions function"}},[t._v("fbm")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("p"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("vec2")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("f32")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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More octaves will add more texture to the terrain mesh, but you'll get diminishing returns at higher levels. I find that 5 is a good number.")]),t._v(" "),a("li",[t._v("We multiply "),a("code",[t._v("p")]),t._v(" by "),a("code",[t._v("0.01")]),t._v(' to "zoom in" on the noise function. This is because our mesh will be 1x1 quads, and the simplex noise function resembles white noise when stepping by one each time. You can see what it looks like to use '),a("code",[t._v("p")]),t._v(" directly: "),a("img",{attrs:{src:s(379),alt:"spiky terrain"}})]),t._v(" "),a("li",[t._v("The "),a("code",[t._v("a")]),t._v(" variable is the amplitude of the noise at the given noise level.")]),t._v(" "),a("li",[a("code",[t._v("shift")]),t._v(" and "),a("code",[t._v("rot")]),t._v(" are used to reduce artifacts in the generated noise. 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I'll admit to not really understanding the math behind OpenSimplex noise. The basics are that it's similar to Perlin Noise, but instead of a square grid, it's a hexagonal grid that removes some of the artifacts that generating the noise on a square grid gets you. Again, I'm not an expert on this, so to summarize: "),a("code",[t._v("permute3()")]),t._v(" takes a "),a("code",[t._v("vec3")]),t._v(" and returns a pseudorandom "),a("code",[t._v("vec3")]),t._v(", "),a("code",[t._v("snoise2()")]),t._v(" takes a "),a("code",[t._v("vec2")]),t._v(" and returns a floating point number between [-1, 1]. If you want to learn more about noise functions, check out "),a("a",{attrs:{href:"https://thebookofshaders.com/11/",target:"_blank",rel:"noopener noreferrer"}},[t._v("this article from The Book of Shaders"),a("OutboundLink")],1),t._v(". The code's in GLSL, but the concepts are the same.")]),t._v(" "),a("p",[t._v("While we can use the output of "),a("code",[t._v("snoise")]),t._v(" directly to generate the terrain's height values, the result of this tends to be very smooth, which may be what you want, but it doesn't look very organic, as you can see below:")]),t._v(" "),a("p",[a("img",{attrs:{src:s(377),alt:"smooth terrain"}})]),t._v(" "),a("p",[t._v("To make the terrain a bit rougher, we're going to use a technique called "),a("a",{attrs:{href:"https://thebookofshaders.com/13/",target:"_blank",rel:"noopener noreferrer"}},[t._v("Fractal Brownian Motion"),a("OutboundLink")],1),t._v(". This technique works by sampling the noise function multiple times, cutting the strength in half each time while doubling the frequency of the noise. This means that the overall shape of the terrain will be fairly smooth, but it will have sharper details. You can see what that will look like below:")]),t._v(" "),a("p",[a("img",{attrs:{src:s(378),alt:"more organic terrain"}})]),t._v(" "),a("p",[t._v("The code for this function is actually quite simple:")]),t._v(" "),a("div",{staticClass:"language-wgsl extra-class"},[a("pre",{pre:!0,attrs:{class:"language-wgsl"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token functions function"}},[t._v("fbm")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("p"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("vec2")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("f32")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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More octaves will add more texture to the terrain mesh, but you'll get diminishing returns at higher levels. I find that 5 is a good number.")]),t._v(" "),a("li",[t._v("We multiply "),a("code",[t._v("p")]),t._v(" by "),a("code",[t._v("0.01")]),t._v(' to "zoom in" on the noise function. This is because our mesh will be 1x1 quads, and the simplex noise function resembles white noise when stepping by one each time. You can see what it looks like to use '),a("code",[t._v("p")]),t._v(" directly: "),a("img",{attrs:{src:s(379),alt:"spiky terrain"}})]),t._v(" "),a("li",[t._v("The "),a("code",[t._v("a")]),t._v(" variable is the amplitude of the noise at the given noise level.")]),t._v(" "),a("li",[a("code",[t._v("shift")]),t._v(" and "),a("code",[t._v("rot")]),t._v(" are used to reduce artifacts in the generated noise. 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My previous code used a GLSL struct similar to my "),s("code",[t._v("ModelVertex")]),t._v(".")]),t._v(" "),s("div",{staticClass:"language-glsl extra-class"},[s("pre",{pre:!0,attrs:{class:"language-glsl"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("struct")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("ModelVertex")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("vec3")]),t._v(" position"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("vec2")]),t._v(" tex_coords"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("vec3")]),t._v(" normal"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("vec3")]),t._v(" tangent"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("vec3")]),t._v(" bitangent"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),s("p",[t._v("At first glance, this seems just fine, but OpenGL experts would likely see a problem with the structure. Our fields aren't aligned properly to support the "),s("code",[t._v("std430")]),t._v(" alignment that storage buffers require. I won't get into detail but you can check out the "),s("a",{attrs:{href:"../alignment"}},[t._v("alignment showcase")]),t._v(" if you want to know more. To summarize, the "),s("code",[t._v("vec2")]),t._v(" for the "),s("code",[t._v("tex_coords")]),t._v(" was messing up the byte alignment, corrupting the vertex data resulting in the following:")]),t._v(" "),s("p",[s("img",{attrs:{src:a(382),alt:"./corruption.png"}})]),t._v(" "),s("p",[t._v("I could have fixed this by adding a padding field after "),s("code",[t._v("tex_coords")]),t._v(" on the Rust side, but that would require modifying the "),s("code",[t._v("VertexBufferLayout")]),t._v(". I ended up solving this problem by using the components of the vectors directly which resulted in a struct like this:")]),t._v(" "),s("div",{staticClass:"language-glsl extra-class"},[s("pre",{pre:!0,attrs:{class:"language-glsl"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("struct")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("ModelVertex")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" x"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" y"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" z"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" uv"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" uw"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" nx"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" ny"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" nz"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" tx"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" ty"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" tz"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" bx"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" by"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("float")]),t._v(" bz"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),s("p",[t._v("Since "),s("code",[t._v("std430")]),t._v(" will use the alignment of the largest element of the struct, using all floats means the struct will be aligned to 4 bytes. This is alignment matches what "),s("code",[t._v("ModelVertex")]),t._v(" uses in Rust. This was kind of a pain to work with, but it fixed the corruption issue.")]),t._v(" "),s("p",[t._v("The second problem required me to rethink how I was computing the tangent and bitangent. The previous algorithm I was using only computed the tangent and bitangent for each triangle and set all the vertices in that triangle to use the same tangent and bitangent. While this is fine in a single-threaded context, the code breaks down when trying to compute the triangles in parallel. The reason is that multiple triangles can share the same vertices. This means that when we go to save the resulting tangents, we inevitably end up trying to write to the same vertex from multiple different threads which is a big no no. You can see the issue with this method below:")]),t._v(" "),s("p",[s("img",{attrs:{src:a(383),alt:"./black_triangles.png"}})]),t._v(" "),s("p",[t._v("Those black triangles were the result of multiple GPU threads trying to modify the same vertices. Looking at the data in Render Doc I could see that the tangents and bitangents were garbage numbers such as "),s("code",[t._v("NaN")]),t._v(".")]),t._v(" "),s("p",[s("img",{attrs:{src:a(384),alt:"./render_doc_output.png"}})]),t._v(" "),s("p",[t._v("While on the CPU we could introduce a synchronization primitive such as a "),s("code",[t._v("Mutex")]),t._v(" to fix this issue, AFAIK there isn't really such a thing on the GPU. Instead, I decided to swap my code to work with each vertex individually. There are some hurdles with that, but those will be easier to explain in code. Let's start with the "),s("code",[t._v("main")]),t._v(" function.")]),t._v(" "),s("div",{staticClass:"language-glsl extra-class"},[s("pre",{pre:!0,attrs:{class:"language-glsl"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("void")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("uint")]),t._v(" vertexIndex "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" gl_GlobalInvocationID"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("x"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n ModelVertex result "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("calcTangentBitangent")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("vertexIndex"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n dstVertices"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("vertexIndex"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" result"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("We use the "),s("code",[t._v("gl_GlobalInvocationID.x")]),t._v(" to get the index of the vertex we want to compute the tangents for. I opted to put the actual calculation into its own method. Let's take a look at that.")]),t._v(" "),s("div",{staticClass:"language-glsl extra-class"},[s("pre",{pre:!0,attrs:{class:"language-glsl"}},[s("code",[t._v("ModelVertex "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("calcTangentBitangent")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("uint")]),t._v(" vertexIndex"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n ModelVertex v "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" srcVertices"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("vertexIndex"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("vec3")]),t._v(" tangent "),s("span",{pre:!0,attrs:{class:"token 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Using it as a storage buffer proved less convenient. 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First, we need to get a frame to render to.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// impl State")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("render")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("self")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("->")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Result")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SurfaceError")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" output "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("self")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("surface"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_current_texture")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),s("p",[t._v("The "),s("code",[t._v("get_current_texture")]),t._v(" function will wait for the "),s("code",[t._v("surface")]),t._v(" to provide a new "),s("code",[t._v("SurfaceTexture")]),t._v(" that we will render to. 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We need to do this because we want to control how the render code interacts with the texture.")]),t._v(" "),s("p",[t._v("We also need to create a "),s("code",[t._v("CommandEncoder")]),t._v(" to create the actual commands to send to the GPU. Most modern graphics frameworks expect commands to be stored in a command buffer before being sent to the GPU. The "),s("code",[t._v("encoder")]),t._v(" builds a command buffer that we can then send to the GPU.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" encoder "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("self")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("device"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("create_command_encoder")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("CommandEncoderDescriptor")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n label"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Render Encoder"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),s("p",[t._v("Now we can get to clearing the screen (a long time coming). 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"),s("p",[s("img",{attrs:{src:a(328),alt:"Window with a blue background"}})]),t._v(" "),s("h2",{attrs:{id:"wait-what-s-going-on-with-renderpassdescriptor"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#wait-what-s-going-on-with-renderpassdescriptor"}},[t._v("#")]),t._v(" Wait, what's going on with RenderPassDescriptor?")]),t._v(" "),s("p",[t._v("Some of you may be able to tell what's going on just by looking at it, but I'd be remiss if I didn't go over it. Let's take a look at the code again.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("RenderPassDescriptor")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n label"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Render Pass"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n color_attachments"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// ...")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n depth_stencil_attachment"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("A "),s("code",[t._v("RenderPassDescriptor")]),t._v(" only has three fields: "),s("code",[t._v("label")]),t._v(", "),s("code",[t._v("color_attachments")]),t._v(" and "),s("code",[t._v("depth_stencil_attachment")]),t._v(". 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This allows you to use a pipeline that expects multiple render targets and only supplies the ones you care about.')])]),t._v(" "),s("p",[t._v("We'll use "),s("code",[t._v("depth_stencil_attachment")]),t._v(" later, but we'll set it to "),s("code",[t._v("None")]),t._v(" for now.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("RenderPassColorAttachment")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n view"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("view"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n resolve_target"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n ops"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Operations")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n load"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("LoadOp")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Clear")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Color")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n r"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0.1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n g"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0.2")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n b"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0.3")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n a"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1.0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n store"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("StoreOp")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Store")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),s("p",[t._v("The "),s("code",[t._v("RenderPassColorAttachment")]),t._v(" has the "),s("code",[t._v("view")]),t._v(" field, which informs "),s("code",[t._v("wgpu")]),t._v(" what texture to save the colors to. 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If your scene doesn't cover the entire screen, however, you can end up with something like this.")]),t._v(" "),s("p",[s("img",{attrs:{src:a(329),alt:"./no-clear.png"}})])]),t._v(" "),s("h2",{attrs:{id:"validation-errors"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#validation-errors"}},[t._v("#")]),t._v(" Validation Errors?")]),t._v(" "),s("p",[t._v("If wgpu is using Vulkan on your machine, you may run into validation errors if you are running an older version of the Vulkan SDK. You should be using at least version "),s("code",[t._v("1.2.182")]),t._v(" as older versions can give out some false positives. If errors persist, you may have encountered a bug in wgpu. 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That's the reason we stored the physical "),s("code",[t._v("size")]),t._v(" and the "),s("code",[t._v("config")]),t._v(" used to configure the "),s("code",[t._v("surface")]),t._v(". 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indicate whether an event has been fully processed. If the method returns "),s("code",[t._v("true")]),t._v(", the main loop won't process the event any further.")]),t._v(" "),s("p",[t._v("We're just going to return false for now because we don't have any events we want to capture.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// impl State")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("input")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("self")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" event"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("WindowEvent")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("->")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("bool")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token boolean"}},[t._v("false")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("We need to do a little more work in the event loop. We want "),s("code",[t._v("State")]),t._v(" to have priority over "),s("code",[t._v("run()")]),t._v(". Doing that (and previous changes) should make your loop look like this.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// run()")]),t._v("\nevent_loop"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("run")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("move")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token closure-params"}},[s("span",{pre:!0,attrs:{class:"token closure-punctuation punctuation"}},[t._v("|")]),t._v("event"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" control_flow"),s("span",{pre:!0,attrs:{class:"token closure-punctuation punctuation"}},[t._v("|")])]),t._v(" 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"),s("p",[s("img",{attrs:{src:a(330),alt:"Window with a blue background"}})]),t._v(" "),s("h2",{attrs:{id:"wait-what-s-going-on-with-renderpassdescriptor"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#wait-what-s-going-on-with-renderpassdescriptor"}},[t._v("#")]),t._v(" Wait, what's going on with RenderPassDescriptor?")]),t._v(" "),s("p",[t._v("Some of you may be able to tell what's going on just by looking at it, but I'd be remiss if I didn't go over it. Let's take a look at the code again.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("RenderPassDescriptor")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n label"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Render Pass"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n color_attachments"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// ...")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n depth_stencil_attachment"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("A "),s("code",[t._v("RenderPassDescriptor")]),t._v(" only has three fields: "),s("code",[t._v("label")]),t._v(", "),s("code",[t._v("color_attachments")]),t._v(" and "),s("code",[t._v("depth_stencil_attachment")]),t._v(". The "),s("code",[t._v("color_attachments")]),t._v(" describe where we are going to draw our color to. We use the "),s("code",[t._v("TextureView")]),t._v(" we created earlier to make sure that we render to the screen.")]),t._v(" "),s("div",{staticClass:"note"},[s("p",[t._v("The "),s("code",[t._v("color_attachments")]),t._v(' field is a "sparse" array. This allows you to use a pipeline that expects multiple render targets and only supplies the ones you care about.')])]),t._v(" "),s("p",[t._v("We'll use "),s("code",[t._v("depth_stencil_attachment")]),t._v(" later, but we'll set it to "),s("code",[t._v("None")]),t._v(" for now.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("RenderPassColorAttachment")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n view"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("view"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n resolve_target"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n ops"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Operations")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n load"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("LoadOp")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Clear")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Color")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n r"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0.1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n g"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0.2")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n b"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0.3")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n a"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1.0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n store"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("StoreOp")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Store")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),s("p",[t._v("The "),s("code",[t._v("RenderPassColorAttachment")]),t._v(" has the "),s("code",[t._v("view")]),t._v(" field, which informs "),s("code",[t._v("wgpu")]),t._v(" what texture to save the colors to. In this case, we specify the "),s("code",[t._v("view")]),t._v(" that we created using "),s("code",[t._v("surface.get_current_texture()")]),t._v(". This means that any colors we draw to this attachment will get drawn to the screen.")]),t._v(" "),s("p",[t._v("The "),s("code",[t._v("resolve_target")]),t._v(" is the texture that will receive the resolved output. This will be the same as "),s("code",[t._v("view")]),t._v(" unless multisampling is enabled. We don't need to specify this, so we leave it as "),s("code",[t._v("None")]),t._v(".")]),t._v(" "),s("p",[t._v("The "),s("code",[t._v("ops")]),t._v(" field takes a "),s("code",[t._v("wpgu::Operations")]),t._v(" object. This tells wgpu what to do with the colors on the screen (specified by "),s("code",[t._v("view")]),t._v("). The "),s("code",[t._v("load")]),t._v(" field tells wgpu how to handle colors stored from the previous frame. Currently, we are clearing the screen with a bluish color. The "),s("code",[t._v("store")]),t._v(" field tells wgpu whether we want to store the rendered results to the "),s("code",[t._v("Texture")]),t._v(" behind our "),s("code",[t._v("TextureView")]),t._v(" (in this case, it's the "),s("code",[t._v("SurfaceTexture")]),t._v("). We use "),s("code",[t._v("StoreOp::Store")]),t._v(" as we do want to store our render results.")]),t._v(" "),s("div",{staticClass:"note"},[s("p",[t._v("It's not uncommon to not clear the screen if the screen is going to be completely covered up with objects. If your scene doesn't cover the entire screen, however, you can end up with something like this.")]),t._v(" "),s("p",[s("img",{attrs:{src:a(331),alt:"./no-clear.png"}})])]),t._v(" "),s("h2",{attrs:{id:"validation-errors"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#validation-errors"}},[t._v("#")]),t._v(" Validation Errors?")]),t._v(" "),s("p",[t._v("If wgpu is using Vulkan on your machine, you may run into validation errors if you are running an older version of the Vulkan SDK. You should be using at least version "),s("code",[t._v("1.2.182")]),t._v(" as older versions can give out some false positives. If errors persist, you may have encountered a bug in wgpu. You can post an issue at "),s("a",{attrs:{href:"https://github.com/gfx-rs/wgpu",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://github.com/gfx-rs/wgpu"),s("OutboundLink")],1)]),t._v(" "),s("h2",{attrs:{id:"challenge"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#challenge"}},[t._v("#")]),t._v(" Challenge")]),t._v(" "),s("p",[t._v("Modify the "),s("code",[t._v("input()")]),t._v(" method to capture mouse events, and update the clear color using that. 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For now, we're just going to use vertex and fragment shaders.")]),t._v(" "),s("h2",{attrs:{id:"vertex-fragment-what-are-those"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#vertex-fragment-what-are-those"}},[t._v("#")]),t._v(" Vertex, fragment... what are those?")]),t._v(" "),s("p",[t._v("A vertex is a point in 3D space (can also be 2D). These vertices are then bundled in groups of 2s to form lines and/or 3s to form triangles.")]),t._v(" "),s("img",{attrs:{alt:"Vertices Graphic",src:a(341)}}),t._v(" "),s("p",[t._v("Most modern rendering uses triangles to make all shapes, from simple shapes (such as cubes) to complex ones (such as people). These triangles are stored as vertices, which are the points that make up the corners of the triangles.")]),t._v(" "),s("p",[t._v("We use a vertex shader to manipulate the vertices in order to transform the shape to look the way we want it.")]),t._v(" "),s("p",[t._v("The vertices are then converted into fragments. 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The fragment shader decides what color the fragment will be.")]),t._v(" "),s("h2",{attrs:{id:"wgsl"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#wgsl"}},[t._v("#")]),t._v(" WGSL")]),t._v(" "),s("p",[s("a",{attrs:{href:"https://www.w3.org/TR/WGSL/",target:"_blank",rel:"noopener noreferrer"}},[t._v("WebGPU Shading Language"),s("OutboundLink")],1),t._v(" (WGSL) is the shader language for WebGPU.\nWGSL's development focuses on getting it to easily convert into the shader language corresponding to the backend; for example, SPIR-V for Vulkan, MSL for Metal, HLSL for DX12, and GLSL for OpenGL.\nThe conversion is done internally, and we usually don't need to care about the details.\nIn the case of wgpu, it's done by the library called "),s("a",{attrs:{href:"https://github.com/gfx-rs/naga",target:"_blank",rel:"noopener noreferrer"}},[t._v("naga"),s("OutboundLink")],1),t._v(".")]),t._v(" "),s("p",[t._v("Note that, at the time of writing this, some WebGPU implementations also support SPIR-V, but it's just a temporary measure during the transition period to WGSL and will be removed (If you are curious about the drama behind SPIR-V and WGSL, please refer to "),s("a",{attrs:{href:"https://kvark.github.io/spirv/2021/05/01/spirv-horrors.html",target:"_blank",rel:"noopener noreferrer"}},[t._v("this blog post"),s("OutboundLink")],1),t._v(").")]),t._v(" "),s("div",{staticClass:"note"},[s("p",[t._v("If you've gone through this tutorial before, you'll likely notice that I've switched from using GLSL to using WGSL. 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This currently consists of only one field, which is our vertex's "),s("code",[t._v("clip_position")]),t._v(". The "),s("code",[t._v("@builtin(position)")]),t._v(" bit tells WGPU that this is the value we want to use as the vertex's "),s("a",{attrs:{href:"https://en.wikipedia.org/wiki/Clip_coordinates",target:"_blank",rel:"noopener noreferrer"}},[t._v("clip coordinates"),s("OutboundLink")],1),t._v(". This is analogous to GLSL's "),s("code",[t._v("gl_Position")]),t._v(" variable.")]),t._v(" "),s("div",{staticClass:"note"},[s("p",[t._v("Vector types such as "),s("code",[t._v("vec4")]),t._v(" are generic. Currently, you must specify the type of value the vector will contain. Thus, a 3D vector using 32bit floats would be "),s("code",[t._v("vec3")]),t._v(".")])]),t._v(" "),s("p",[t._v("The next part of the shader code is the "),s("code",[t._v("vs_main")]),t._v(" function. We are using "),s("code",[t._v("@vertex")]),t._v(" to mark this function as a valid entry point for a vertex shader. We expect a "),s("code",[t._v("u32")]),t._v(" called "),s("code",[t._v("in_vertex_index")]),t._v(", which gets its value from "),s("code",[t._v("@builtin(vertex_index)")]),t._v(".")]),t._v(" "),s("p",[t._v("We then declare a variable called "),s("code",[t._v("out")]),t._v(" using our "),s("code",[t._v("VertexOutput")]),t._v(" struct. We create two other variables for the "),s("code",[t._v("x")]),t._v(" and "),s("code",[t._v("y")]),t._v(" of a triangle.")]),t._v(" "),s("div",{staticClass:"note"},[s("p",[t._v("The "),s("code",[t._v("f32()")]),t._v(" and "),s("code",[t._v("i32()")]),t._v(" bits are examples of casts.")])]),t._v(" "),s("div",{staticClass:"note"},[s("p",[t._v("Variables defined with "),s("code",[t._v("var")]),t._v(" can be modified but must specify their type. Variables created with "),s("code",[t._v("let")]),t._v(" can have their types inferred, but their value cannot be changed during the shader.")])]),t._v(" "),s("p",[t._v("Now we can save our "),s("code",[t._v("clip_position")]),t._v(" to "),s("code",[t._v("out")]),t._v(". 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Still in "),s("code",[t._v("shader.wgsl")]),t._v(" add the following:")]),t._v(" "),s("div",{staticClass:"language-wgsl extra-class"},[s("pre",{pre:!0,attrs:{class:"language-wgsl"}},[s("code",[s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Fragment shader")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("@")]),s("span",{pre:!0,attrs:{class:"token attributes attr-name"}},[t._v("fragment")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token functions function"}},[t._v("fs_main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("in"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("VertexOutput")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("->")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("@")]),s("span",{pre:!0,attrs:{class:"token attributes attr-name"}},[t._v("location")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token int-literal number"}},[t._v("0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("vec4")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),s("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("f32")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("return")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("vec4")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),s("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("f32")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token decimal-float-literal number"}},[t._v("0.3")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token decimal-float-literal number"}},[t._v("0.2")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token decimal-float-literal number"}},[t._v("0.1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token decimal-float-literal number"}},[t._v("1.0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("This sets the color of the current fragment to brown.")]),t._v(" "),s("div",{staticClass:"note"},[s("p",[t._v("Notice that the entry point for the vertex shader was named "),s("code",[t._v("vs_main")]),t._v(" and that the entry point for the fragment shader is called "),s("code",[t._v("fs_main")]),t._v(". 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strict";a.r(s);var e=a(7),n=Object(e.a)({},(function(){var t=this,s=t._self._c;return s("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[s("h1",{attrs:{id:"the-pipeline"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#the-pipeline"}},[t._v("#")]),t._v(" The Pipeline")]),t._v(" "),s("h2",{attrs:{id:"what-s-a-pipeline"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#what-s-a-pipeline"}},[t._v("#")]),t._v(" What's a pipeline?")]),t._v(" "),s("p",[t._v("If you're familiar with OpenGL, you may remember using shader programs. 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For now, we're just going to use vertex and fragment shaders.")]),t._v(" "),s("h2",{attrs:{id:"vertex-fragment-what-are-those"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#vertex-fragment-what-are-those"}},[t._v("#")]),t._v(" Vertex, fragment... what are those?")]),t._v(" "),s("p",[t._v("A vertex is a point in 3D space (can also be 2D). These vertices are then bundled in groups of 2s to form lines and/or 3s to form triangles.")]),t._v(" "),s("img",{attrs:{alt:"Vertices Graphic",src:a(328)}}),t._v(" "),s("p",[t._v("Most modern rendering uses triangles to make all shapes, from simple shapes (such as cubes) to complex ones (such as people). These triangles are stored as vertices, which are the points that make up the corners of the triangles.")]),t._v(" "),s("p",[t._v("We use a vertex shader to manipulate the vertices in order to transform the shape to look the way we want it.")]),t._v(" "),s("p",[t._v("The vertices are then converted into fragments. 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The fragment shader decides what color the fragment will be.")]),t._v(" "),s("h2",{attrs:{id:"wgsl"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#wgsl"}},[t._v("#")]),t._v(" WGSL")]),t._v(" "),s("p",[s("a",{attrs:{href:"https://www.w3.org/TR/WGSL/",target:"_blank",rel:"noopener noreferrer"}},[t._v("WebGPU Shading Language"),s("OutboundLink")],1),t._v(" (WGSL) is the shader language for WebGPU.\nWGSL's development focuses on getting it to easily convert into the shader language corresponding to the backend; for example, SPIR-V for Vulkan, MSL for Metal, HLSL for DX12, and GLSL for OpenGL.\nThe conversion is done internally, and we usually don't need to care about the details.\nIn the case of wgpu, it's done by the library called "),s("a",{attrs:{href:"https://github.com/gfx-rs/naga",target:"_blank",rel:"noopener noreferrer"}},[t._v("naga"),s("OutboundLink")],1),t._v(".")]),t._v(" "),s("p",[t._v("Note that, at the time of writing this, some WebGPU implementations also support SPIR-V, but it's just a temporary measure during the transition period to WGSL and will be removed (If you are curious about the drama behind SPIR-V and WGSL, please refer to "),s("a",{attrs:{href:"https://kvark.github.io/spirv/2021/05/01/spirv-horrors.html",target:"_blank",rel:"noopener noreferrer"}},[t._v("this blog post"),s("OutboundLink")],1),t._v(").")]),t._v(" "),s("div",{staticClass:"note"},[s("p",[t._v("If you've gone through this tutorial before, you'll likely notice that I've switched from using GLSL to using WGSL. 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This currently consists of only one field, which is our vertex's "),s("code",[t._v("clip_position")]),t._v(". The "),s("code",[t._v("@builtin(position)")]),t._v(" bit tells WGPU that this is the value we want to use as the vertex's "),s("a",{attrs:{href:"https://en.wikipedia.org/wiki/Clip_coordinates",target:"_blank",rel:"noopener noreferrer"}},[t._v("clip coordinates"),s("OutboundLink")],1),t._v(". This is analogous to GLSL's "),s("code",[t._v("gl_Position")]),t._v(" variable.")]),t._v(" "),s("div",{staticClass:"note"},[s("p",[t._v("Vector types such as "),s("code",[t._v("vec4")]),t._v(" are generic. Currently, you must specify the type of value the vector will contain. Thus, a 3D vector using 32bit floats would be "),s("code",[t._v("vec3")]),t._v(".")])]),t._v(" "),s("p",[t._v("The next part of the shader code is the "),s("code",[t._v("vs_main")]),t._v(" function. We are using "),s("code",[t._v("@vertex")]),t._v(" to mark this function as a valid entry point for a vertex shader. We expect a "),s("code",[t._v("u32")]),t._v(" called "),s("code",[t._v("in_vertex_index")]),t._v(", which gets its value from "),s("code",[t._v("@builtin(vertex_index)")]),t._v(".")]),t._v(" "),s("p",[t._v("We then declare a variable called "),s("code",[t._v("out")]),t._v(" using our "),s("code",[t._v("VertexOutput")]),t._v(" struct. We create two other variables for the "),s("code",[t._v("x")]),t._v(" and "),s("code",[t._v("y")]),t._v(" of a triangle.")]),t._v(" "),s("div",{staticClass:"note"},[s("p",[t._v("The "),s("code",[t._v("f32()")]),t._v(" and "),s("code",[t._v("i32()")]),t._v(" bits are examples of casts.")])]),t._v(" "),s("div",{staticClass:"note"},[s("p",[t._v("Variables defined with "),s("code",[t._v("var")]),t._v(" can be modified but must specify their type. Variables created with "),s("code",[t._v("let")]),t._v(" can have their types inferred, but their value cannot be changed during the shader.")])]),t._v(" "),s("p",[t._v("Now we can save our "),s("code",[t._v("clip_position")]),t._v(" to "),s("code",[t._v("out")]),t._v(". 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Still in "),s("code",[t._v("shader.wgsl")]),t._v(" add the following:")]),t._v(" "),s("div",{staticClass:"language-wgsl extra-class"},[s("pre",{pre:!0,attrs:{class:"language-wgsl"}},[s("code",[s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Fragment shader")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("@")]),s("span",{pre:!0,attrs:{class:"token attributes attr-name"}},[t._v("fragment")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token functions function"}},[t._v("fs_main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("in"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("VertexOutput")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("->")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("@")]),s("span",{pre:!0,attrs:{class:"token attributes attr-name"}},[t._v("location")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token int-literal number"}},[t._v("0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("vec4")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),s("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("f32")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("return")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("vec4")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),s("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("f32")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token decimal-float-literal number"}},[t._v("0.3")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token decimal-float-literal number"}},[t._v("0.2")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token decimal-float-literal number"}},[t._v("0.1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token decimal-float-literal number"}},[t._v("1.0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("This sets the color of the current fragment to brown.")]),t._v(" "),s("div",{staticClass:"note"},[s("p",[t._v("Notice that the entry point for the vertex shader was named "),s("code",[t._v("vs_main")]),t._v(" and that the entry point for the fragment shader is called "),s("code",[t._v("fs_main")]),t._v(". 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This is only an issue if you aren't using a camera matrix.")])]),t._v(" "),s("p",[t._v("Now let's add a "),s("code",[t._v("camera")]),t._v(" field to "),s("code",[t._v("State")]),t._v(".")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("struct")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token type-definition class-name"}},[t._v("State")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// ...")]),t._v("\n camera"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Camera")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// ...")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token 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...")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("Now that we have our camera, and it can make us a view projection matrix, we need somewhere to put it. 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The camera slowly moves back when you rotate it. It works for our purposes, though. Feel free to improve it!")]),t._v(" "),s("p",[t._v("We still need to plug this into our existing code to make it do anything. 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The camera slowly moves back when you rotate it. It works for our purposes, though. Feel free to improve it!")]),t._v(" "),s("p",[t._v("We still need to plug this into our existing code to make it do anything. Add the controller to "),s("code",[t._v("State")]),t._v(" and create it in "),s("code",[t._v("new()")]),t._v(".")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("struct")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token type-definition class-name"}},[t._v("State")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// ...")]),t._v("\n camera"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Camera")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// NEW!")]),t._v("\n camera_controller"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token 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"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" output\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("texture\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("create_view")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),e("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("wgpu"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TextureViewDescriptor")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("default")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),e("p",[t._v("The Pong and imgui examples are broken again. I may remove the imgui example as the corresponding crate already has examples of how to use it. I'm also considering reworking the Pong example, but I may end up just updating it.")]),t._v(" "),e("h2",{attrs:{id:"pong-and-imgui-demos-are-fixed"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#pong-and-imgui-demos-are-fixed"}},[t._v("#")]),t._v(" Pong and imgui demos are fixed!")]),t._v(" "),e("p",[t._v("The "),e("code",[t._v("imgui_wgpu")]),t._v(" and "),e("code",[t._v("wgpu_glyph")]),t._v(" crates have been updated to "),e("code",[t._v("wgpu")]),t._v(" 0.8 so I was able to fix the demos! They both still use GLSL, and I don't think I'll be changing that for now. I may switch them over to "),e("code",[t._v("naga")]),t._v(" at some point.")]),t._v(" "),e("h2",{attrs:{id:"_0-8-and-wgsl"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#_0-8-and-wgsl"}},[t._v("#")]),t._v(" 0.8 and WGSL")]),t._v(" "),e("h3",{attrs:{id:"the-glsl-shaders-have-been-translated-to-wgsl"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#the-glsl-shaders-have-been-translated-to-wgsl"}},[t._v("#")]),t._v(" The GLSL shaders have been translated to WGSL")]),t._v(" "),e("p",[t._v("Originally I wanted to wait until the WGSL spec fully stabilized, but due to some issues with the GLSL code, I've decided to switch over the code now. While GLSL is supported by WebGPU, it's currently secondary to WGSL. I'll keep an example of how to use GLSL (and maybe add HLSL and Metal as well), but I'm going to use WGSL from now on.")]),t._v(" "),e("h3",{attrs:{id:"shaderc-has-been-removed"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#shaderc-has-been-removed"}},[t._v("#")]),t._v(" Shaderc has been removed")]),t._v(" "),e("p",[t._v("I've been thinking about doing this for a while now. Because shaderc is a c library, it often has to be redownloaded during builds. This has been slowing down my ability to add new content and maintain old content. I had been considering switching to naga earlier, but some of my shaders (notably the lighting ones) weren't compiling with naga as I was using features not available for compatibility reasons ("),e("code",[t._v("inverse")]),t._v(" is not available in all languages targeting spirv).")]),t._v(" "),e("p",[t._v("Since I needed to make a bunch of changes to the code base to make the glsl, and because I wanted to switch the tutorial to WGSL anyways, I decided to bite the bullet and recode everything in WGSL and remove shaderc from the tutorials.")]),t._v(" "),e("h3",{attrs:{id:"some-of-the-showcase-examples-are-broken"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#some-of-the-showcase-examples-are-broken"}},[t._v("#")]),t._v(" Some of the showcase examples are broken")]),t._v(" "),e("p",[t._v("The "),e("code",[t._v("wgpu_glyph")]),t._v(", and "),e("code",[t._v("imgui-wgpu")]),t._v(" crates currently depend on "),e("code",[t._v("wgpu")]),t._v(" 0.7, which is causing the "),e("code",[t._v("pong")]),t._v(" and "),e("code",[t._v("imgui-demo")]),t._v(" to not compile. I decided to exclude them from the workspace until the underlying crates update to using "),e("code",[t._v("wgpu")]),t._v(" 0.8. (Feel free to submit a issue or even PR when that happens!)")]),t._v(" "),e("h3",{attrs:{id:"various-api-changes"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#various-api-changes"}},[t._v("#")]),t._v(" Various API changes")]),t._v(" "),e("ul",[e("li",[t._v("The "),e("code",[t._v("depth")]),t._v(" field is now "),e("code",[t._v("depth_or_array_layers")])]),t._v(" "),e("li",[e("code",[t._v("wgpu::VertexFormat::Float3")]),t._v(" is now "),e("code",[t._v("wgpu::VertexFormat::Float32x3")]),t._v(". Similar things apply to "),e("code",[t._v("Float2")]),t._v(" and "),e("code",[t._v("Float4")])]),t._v(" "),e("li",[e("code",[t._v("CullMode")]),t._v(" is no longer a thing, instead "),e("code",[t._v("PrimitiveState::cull_mode")]),t._v(" will require an "),e("code",[t._v("Option")])]),t._v(" "),e("li",[t._v("Added "),e("code",[t._v("clamp_depth")]),t._v(" and "),e("code",[t._v("conservative")]),t._v(" to "),e("code",[t._v("PrimitiveState")]),t._v(". Part of this means that "),e("code",[t._v("DepthStencilState")]),t._v(" no longer has a "),e("code",[t._v("clamp_depth")]),t._v(" field.")]),t._v(" "),e("li",[e("code",[t._v("color_blend")]),t._v(" and "),e("code",[t._v("alpha_blend")]),t._v(" have been moved into the new "),e("code",[t._v("blend")]),t._v(" field with accepts an "),e("code",[t._v("Option")])]),t._v(" "),e("li",[e("code",[t._v("adapter.get_preferred_format()")]),t._v(" now returns an "),e("code",[t._v("Option")])]),t._v(" "),e("li",[e("code",[t._v("wgpu::RenderPassColorAttachmentDescriptor")]),t._v(" has been renamed "),e("code",[t._v("wgpu::RenderPassColorAttachement")]),t._v(" and the "),e("code",[t._v("attachment")]),t._v(" field has been renamed to "),e("code",[t._v("view")])]),t._v(" "),e("li",[e("code",[t._v("wgpu::RenderPassDepthStencialAttachmentDescriptor")]),t._v(" also loses the "),e("code",[t._v("Descriptor")]),t._v(" part of it's name. "),e("code",[t._v("attachment")]),t._v(" gets renamed to "),e("code",[t._v("view")]),t._v(" as well.")]),t._v(" "),e("li",[e("code",[t._v("wgpu::TextureCopyView")]),t._v(" has been renamed to "),e("code",[t._v("wgpu::ImageCopyTexture")]),t._v(". This is a typedef for "),e("code",[t._v("wgpu::ImageCopyTextureBase")])]),t._v(" "),e("li",[e("code",[t._v("wgpu::TextureDataLayout")]),t._v(" is now "),e("code",[t._v("wgpu::ImageDataLayout")]),t._v(" and it's "),e("code",[t._v("bytes_per_row")]),t._v(" and "),e("code",[t._v("rows_per_image")]),t._v(" now take "),e("code",[t._v("NonZeroU32")]),t._v(".")]),t._v(" "),e("li",[e("code",[t._v("wgpu::ImageCopyBuffer")]),t._v(" is now "),e("code",[t._v("wgpu::ImageCopyBuffer")]),t._v(".")])]),t._v(" "),e("h2",{attrs:{id:"_0-7"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#_0-7"}},[t._v("#")]),t._v(" 0.7")]),t._v(" "),e("p",[t._v("There were a lot of changes, particularly to the "),e("code",[t._v("RenderPipelineDescriptor")]),t._v(". Most other things have not changed. You can check out the "),e("a",{attrs:{href:"https://github.com/sotrh/learn-wgpu/pull/140",target:"_blank",rel:"noopener noreferrer"}},[t._v("0.9 PR"),e("OutboundLink")],1),t._v(" for the full details.")]),t._v(" "),e("h2",{attrs:{id:"november-2020-cleanup-content-freeze-and-patreon"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#november-2020-cleanup-content-freeze-and-patreon"}},[t._v("#")]),t._v(" November 2020 Cleanup, Content Freeze, and Patreon")]),t._v(" "),e("p",[t._v("School is starting to ramp up, so I haven't had as much time to work on the site as I would like to. Because of that, there were some issues piling up. I decided to tackle a bunch of them in one go. Here's a snapshot of what I did:")]),t._v(" "),e("ul",[e("li",[t._v("The tutorial now handles "),e("code",[t._v("SurfaceError")]),t._v(" properly")]),t._v(" "),e("li",[t._v("I'm now using bytemuck's derive feature on all buffer data structs.")]),t._v(" "),e("li",[t._v("The "),e("a",{attrs:{href:"../beginner/tutorial7-instancing"}},[t._v("instancing tutorial")]),t._v(" now uses vertex buffers instead of storage buffers.")]),t._v(" "),e("li",[e("code",[t._v("build.rs")]),t._v(" now updates when individual shaders are changed, not whenever "),e("code",[t._v("/src")]),t._v(" is changed.")]),t._v(" "),e("li",[t._v("Had some help from Github user @kanerogers to clean up the "),e("a",{attrs:{href:"../beginner/tutorial5-textures"}},[t._v("texturing tutorial")]),t._v(".")]),t._v(" "),e("li",[t._v("I made a "),e("a",{attrs:{href:"../showcase/compute"}},[t._v("compute pipeline showcase")]),t._v(" that computes the tangent and bitangent for each vertex in a model.")]),t._v(" "),e("li",[t._v("I made a "),e("a",{attrs:{href:"../showcase/imgui-demo"}},[t._v("imgui showcase")]),t._v(". It's very basic, but it should be a good starting point.")])]),t._v(" "),e("p",[t._v('Now in the headline, I mentioned a "Content Freeze". Wgpu is still a moving target. The migration from '),e("code",[t._v("0.4")]),t._v(" to "),e("code",[t._v("0.5")]),t._v(" was a lot of work. The same goes for "),e("code",[t._v("0.5")]),t._v(" to "),e("code",[t._v("0.6")]),t._v(". I expect the next migration to be just as much work. As such, I won't be adding much content until the API becomes a bit more stable. That being said, I still plan on resolving any issues with the content.")]),t._v(" "),e("p",[t._v("One more thing. This is actually quite awkward for me (especially since I'll be slowing down development), but I've started a "),e("a",{attrs:{href:"https://www.patreon.com/sotrh",target:"_blank",rel:"noopener noreferrer"}},[t._v("patreon"),e("OutboundLink")],1),t._v(". My job doesn't give me a ton of hours, so things are a bit tight. You are by no means obligated to donate, but I would appreciate it.")]),t._v(" "),e("p",[t._v("You can find out more about contributing to this project on the "),e("RouterLink",{attrs:{to:"/news/#contribution-and-support"}},[t._v("introduction page")])],1),t._v(" "),e("h2",{attrs:{id:"_0-6"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#_0-6"}},[t._v("#")]),t._v(" 0.6")]),t._v(" "),e("p",[t._v("This took me way too long. The changes weren't difficult, but I had to do a lot of copy pasting. The main changes are using "),e("code",[t._v("queue.write_buffer()")]),t._v(" and "),e("code",[t._v("queue.write_texture()")]),t._v(" everywhere. I won't get into the nitty gritty, but you can check out the "),e("a",{attrs:{href:"https://github.com/sotrh/learn-wgpu/pull/90",target:"_blank",rel:"noopener noreferrer"}},[t._v("pull request"),e("OutboundLink")],1),t._v(" if you're interested.")]),t._v(" "),e("h2",{attrs:{id:"added-pong-showcase"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#added-pong-showcase"}},[t._v("#")]),t._v(" Added Pong Showcase")]),t._v(" "),e("p",[e("RouterLink",{attrs:{to:"/news/showcase/pong/"}},[t._v("See it here")])],1),t._v(" "),e("h2",{attrs:{id:"normal-mapping"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#normal-mapping"}},[t._v("#")]),t._v(" Normal mapping")]),t._v(" "),e("p",[t._v('My perfectionism got in my way a bit with this one. I wasn\'t sure that what I was getting was "physically accurate", but it seems to look good.')]),t._v(" "),e("p",[e("img",{attrs:{src:a(381),alt:""}})]),t._v(" "),e("h2",{attrs:{id:"_0-5"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#_0-5"}},[t._v("#")]),t._v(" 0.5!")]),t._v(" "),e("p",[t._v("Too many things changed to make note of them here. Check out "),e("a",{attrs:{href:"https://github.com/sotrh/learn-wgpu/pull/29",target:"_blank",rel:"noopener noreferrer"}},[t._v("the 0.5 pull request"),e("OutboundLink")],1),t._v(" if you're curious about specifics. That being said, 2 things are worth mentioning directly: the y-axis now points up like with DirectX and Metal, and requesting an adapter and creating a device now use "),e("code",[t._v("Future")]),t._v("s. The tutorials have been updated as well as the code.")]),t._v(" "),e("h2",{attrs:{id:"reworked-lighting-tutorial"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#reworked-lighting-tutorial"}},[t._v("#")]),t._v(" Reworked lighting tutorial")]),t._v(" "),e("p",[t._v("The "),e("RouterLink",{attrs:{to:"/intermediate/tutorial10-lighting/"}},[t._v("lighting tutorial")]),t._v(" was not up to par, so I redid it.")],1),t._v(" "),e("h2",{attrs:{id:"added-gif-showcase"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#added-gif-showcase"}},[t._v("#")]),t._v(" Added GIF showcase")]),t._v(" "),e("p",[e("RouterLink",{attrs:{to:"/showcase/gifs/"}},[t._v("Creating GIFs")])],1),t._v(" "),e("h2",{attrs:{id:"updated-texture-tutorials"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#updated-texture-tutorials"}},[t._v("#")]),t._v(" Updated texture tutorials")]),t._v(" "),e("p",[t._v("Up to this point, we created textures manually every time. I've pulled out the texture creation code into a new "),e("code",[t._v("texture.rs")]),t._v(" file and included it in every tutorial from the "),e("RouterLink",{attrs:{to:"/beginner/tutorial5-textures/#cleaning-things-up"}},[t._v("textures tutorial")]),t._v(" onward.")],1),t._v(" "),e("h2",{attrs:{id:"fixed-panics-due-to-not-specifying-the-correct-usage"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#fixed-panics-due-to-not-specifying-the-correct-usage"}},[t._v("#")]),t._v(" Fixed panics due to not specifying the correct "),e("code",[t._v("usage")])]),t._v(" "),e("p",[t._v("Wgpu has become more strict about what "),e("code",[t._v("BufferUsages")]),t._v("s and "),e("code",[t._v("TextureUsages")]),t._v("s are required when performing certain operations. For example in the "),e("RouterLink",{attrs:{to:"/intermediate/windowless/"}},[t._v("Wgpu without a window example")]),t._v(", the "),e("code",[t._v("texture_desc")]),t._v(" only specified the usage to by "),e("code",[t._v("COPY_SRC")]),t._v(". This caused a crash when the "),e("code",[t._v("texture")]),t._v(" was used as a render target. Adding "),e("code",[t._v("OUTPUT_ATTACHMENT")]),t._v(" fixed the issue.")],1),t._v(" "),e("h2",{attrs:{id:"updating-winit-from-0-20-0-alpha5-to-0-20"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#updating-winit-from-0-20-0-alpha5-to-0-20"}},[t._v("#")]),t._v(" Updating Winit from 0.20.0-alpha5 to 0.20")]),t._v(" "),e("p",[t._v("There were a lot of small changes to how the dpi stuff works. You can see all the changes "),e("a",{attrs:{href:"https://github.com/rust-windowing/winit/blob/master/CHANGELOG.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("in the changelog"),e("OutboundLink")],1),t._v(". That means that some of the tutorials had to change.")]),t._v(" "),e("ul",[e("li",[t._v("I've removed "),e("code",[t._v("hidpi_factor")]),t._v(" from "),e("code",[t._v("State")]),t._v(" entirely. They removed the "),e("code",[t._v("hidpi_factor()")]),t._v(" method from "),e("code",[t._v("winit::window::Window")]),t._v(", and changed "),e("code",[t._v("inner_size()")]),t._v(" to return "),e("code",[t._v("PhysicalSize")]),t._v(" instead of "),e("code",[t._v("LogicalSize")]),t._v(", so we don't need to store the "),e("code",[t._v("hidpi_factor")]),t._v(" anymore.")]),t._v(" "),e("li",[e("code",[t._v("update_hidpi_and_resize")]),t._v(" is no more. Since "),e("code",[t._v("ScaleFactorChanged")]),t._v(" passes in the windows new "),e("code",[t._v("PhysicalSize")]),t._v(", we can simply use "),e("code",[t._v("resize()")]),t._v(".")]),t._v(" "),e("li",[e("code",[t._v("State::size")]),t._v(" is now "),e("code",[t._v("PhysicalSize")]),t._v(" instead of the pre 0.20 "),e("code",[t._v("LogicalSize")]),t._v(".")]),t._v(" "),e("li",[e("code",[t._v("EventsCleared")]),t._v(" is now "),e("code",[t._v("MainEventsCleared")]),t._v(".")])]),t._v(" "),e("p",[t._v("I may have missed a change, but I made sure that all the examples compile and run, so if you have trouble with your code you can use them as a reference.")]),t._v(" "),e("h2",{attrs:{id:"changed-tutorial-examples-to-use-a-src-directory"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#changed-tutorial-examples-to-use-a-src-directory"}},[t._v("#")]),t._v(" Changed tutorial examples to use a src directory")]),t._v(" "),e("p",[t._v("I wasn't using the traditional cargo binary folder setup. I've changed it to the standardized form now.")]),t._v(" "),e("h2",{attrs:{id:"updating-to-0-4-from-0-3"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#updating-to-0-4-from-0-3"}},[t._v("#")]),t._v(" Updating to 0.4 from 0.3")]),t._v(" "),e("p",[t._v("There are a few things that have changed:")]),t._v(" "),e("ol",[e("li",[t._v("The use of "),e("code",[t._v("Instance")]),t._v(" has been removed. 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"),e("code",[t._v("SurfaceTexture")]),t._v(" to draw to will use the surface directly.")]),t._v(" "),e("div",{staticClass:"language-rust extra-class"},[e("pre",{pre:!0,attrs:{class:"language-rust"}},[e("code",[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" output "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("self")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("surface"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_current_texture")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" view 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punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),e("p",[t._v("The Pong and imgui examples are broken again. I may remove the imgui example as the corresponding crate already has examples of how to use it. I'm also considering reworking the Pong example, but I may end up just updating it.")]),t._v(" "),e("h2",{attrs:{id:"pong-and-imgui-demos-are-fixed"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#pong-and-imgui-demos-are-fixed"}},[t._v("#")]),t._v(" Pong and imgui demos are fixed!")]),t._v(" "),e("p",[t._v("The "),e("code",[t._v("imgui_wgpu")]),t._v(" and "),e("code",[t._v("wgpu_glyph")]),t._v(" crates have been updated to "),e("code",[t._v("wgpu")]),t._v(" 0.8 so I was able to fix the demos! They both still use GLSL, and I don't think I'll be changing that for now. I may switch them over to "),e("code",[t._v("naga")]),t._v(" at some point.")]),t._v(" "),e("h2",{attrs:{id:"_0-8-and-wgsl"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#_0-8-and-wgsl"}},[t._v("#")]),t._v(" 0.8 and WGSL")]),t._v(" "),e("h3",{attrs:{id:"the-glsl-shaders-have-been-translated-to-wgsl"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#the-glsl-shaders-have-been-translated-to-wgsl"}},[t._v("#")]),t._v(" The GLSL shaders have been translated to WGSL")]),t._v(" "),e("p",[t._v("Originally I wanted to wait until the WGSL spec fully stabilized, but due to some issues with the GLSL code, I've decided to switch over the code now. While GLSL is supported by WebGPU, it's currently secondary to WGSL. I'll keep an example of how to use GLSL (and maybe add HLSL and Metal as well), but I'm going to use WGSL from now on.")]),t._v(" "),e("h3",{attrs:{id:"shaderc-has-been-removed"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#shaderc-has-been-removed"}},[t._v("#")]),t._v(" Shaderc has been removed")]),t._v(" "),e("p",[t._v("I've been thinking about doing this for a while now. Because shaderc is a c library, it often has to be redownloaded during builds. This has been slowing down my ability to add new content and maintain old content. I had been considering switching to naga earlier, but some of my shaders (notably the lighting ones) weren't compiling with naga as I was using features not available for compatibility reasons ("),e("code",[t._v("inverse")]),t._v(" is not available in all languages targeting spirv).")]),t._v(" "),e("p",[t._v("Since I needed to make a bunch of changes to the code base to make the glsl, and because I wanted to switch the tutorial to WGSL anyways, I decided to bite the bullet and recode everything in WGSL and remove shaderc from the tutorials.")]),t._v(" "),e("h3",{attrs:{id:"some-of-the-showcase-examples-are-broken"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#some-of-the-showcase-examples-are-broken"}},[t._v("#")]),t._v(" Some of the showcase examples are broken")]),t._v(" "),e("p",[t._v("The "),e("code",[t._v("wgpu_glyph")]),t._v(", and "),e("code",[t._v("imgui-wgpu")]),t._v(" crates currently depend on "),e("code",[t._v("wgpu")]),t._v(" 0.7, which is causing the "),e("code",[t._v("pong")]),t._v(" and "),e("code",[t._v("imgui-demo")]),t._v(" to not compile. I decided to exclude them from the workspace until the underlying crates update to using "),e("code",[t._v("wgpu")]),t._v(" 0.8. (Feel free to submit a issue or even PR when that happens!)")]),t._v(" "),e("h3",{attrs:{id:"various-api-changes"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#various-api-changes"}},[t._v("#")]),t._v(" Various API changes")]),t._v(" "),e("ul",[e("li",[t._v("The "),e("code",[t._v("depth")]),t._v(" field is now "),e("code",[t._v("depth_or_array_layers")])]),t._v(" "),e("li",[e("code",[t._v("wgpu::VertexFormat::Float3")]),t._v(" is now "),e("code",[t._v("wgpu::VertexFormat::Float32x3")]),t._v(". Similar things apply to "),e("code",[t._v("Float2")]),t._v(" and "),e("code",[t._v("Float4")])]),t._v(" "),e("li",[e("code",[t._v("CullMode")]),t._v(" is no longer a thing, instead "),e("code",[t._v("PrimitiveState::cull_mode")]),t._v(" will require an "),e("code",[t._v("Option")])]),t._v(" "),e("li",[t._v("Added "),e("code",[t._v("clamp_depth")]),t._v(" and "),e("code",[t._v("conservative")]),t._v(" to "),e("code",[t._v("PrimitiveState")]),t._v(". Part of this means that "),e("code",[t._v("DepthStencilState")]),t._v(" no longer has a "),e("code",[t._v("clamp_depth")]),t._v(" field.")]),t._v(" "),e("li",[e("code",[t._v("color_blend")]),t._v(" and "),e("code",[t._v("alpha_blend")]),t._v(" have been moved into the new "),e("code",[t._v("blend")]),t._v(" field with accepts an "),e("code",[t._v("Option")])]),t._v(" "),e("li",[e("code",[t._v("adapter.get_preferred_format()")]),t._v(" now returns an "),e("code",[t._v("Option")])]),t._v(" "),e("li",[e("code",[t._v("wgpu::RenderPassColorAttachmentDescriptor")]),t._v(" has been renamed "),e("code",[t._v("wgpu::RenderPassColorAttachement")]),t._v(" and the "),e("code",[t._v("attachment")]),t._v(" field has been renamed to "),e("code",[t._v("view")])]),t._v(" "),e("li",[e("code",[t._v("wgpu::RenderPassDepthStencialAttachmentDescriptor")]),t._v(" also loses the "),e("code",[t._v("Descriptor")]),t._v(" part of it's name. "),e("code",[t._v("attachment")]),t._v(" gets renamed to "),e("code",[t._v("view")]),t._v(" as well.")]),t._v(" "),e("li",[e("code",[t._v("wgpu::TextureCopyView")]),t._v(" has been renamed to "),e("code",[t._v("wgpu::ImageCopyTexture")]),t._v(". This is a typedef for "),e("code",[t._v("wgpu::ImageCopyTextureBase")])]),t._v(" "),e("li",[e("code",[t._v("wgpu::TextureDataLayout")]),t._v(" is now "),e("code",[t._v("wgpu::ImageDataLayout")]),t._v(" and it's "),e("code",[t._v("bytes_per_row")]),t._v(" and "),e("code",[t._v("rows_per_image")]),t._v(" now take "),e("code",[t._v("NonZeroU32")]),t._v(".")]),t._v(" "),e("li",[e("code",[t._v("wgpu::ImageCopyBuffer")]),t._v(" is now "),e("code",[t._v("wgpu::ImageCopyBuffer")]),t._v(".")])]),t._v(" "),e("h2",{attrs:{id:"_0-7"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#_0-7"}},[t._v("#")]),t._v(" 0.7")]),t._v(" "),e("p",[t._v("There were a lot of changes, particularly to the "),e("code",[t._v("RenderPipelineDescriptor")]),t._v(". Most other things have not changed. You can check out the "),e("a",{attrs:{href:"https://github.com/sotrh/learn-wgpu/pull/140",target:"_blank",rel:"noopener noreferrer"}},[t._v("0.9 PR"),e("OutboundLink")],1),t._v(" for the full details.")]),t._v(" "),e("h2",{attrs:{id:"november-2020-cleanup-content-freeze-and-patreon"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#november-2020-cleanup-content-freeze-and-patreon"}},[t._v("#")]),t._v(" November 2020 Cleanup, Content Freeze, and Patreon")]),t._v(" "),e("p",[t._v("School is starting to ramp up, so I haven't had as much time to work on the site as I would like to. Because of that, there were some issues piling up. I decided to tackle a bunch of them in one go. Here's a snapshot of what I did:")]),t._v(" "),e("ul",[e("li",[t._v("The tutorial now handles "),e("code",[t._v("SurfaceError")]),t._v(" properly")]),t._v(" "),e("li",[t._v("I'm now using bytemuck's derive feature on all buffer data structs.")]),t._v(" "),e("li",[t._v("The "),e("a",{attrs:{href:"../beginner/tutorial7-instancing"}},[t._v("instancing tutorial")]),t._v(" now uses vertex buffers instead of storage buffers.")]),t._v(" "),e("li",[e("code",[t._v("build.rs")]),t._v(" now updates when individual shaders are changed, not whenever "),e("code",[t._v("/src")]),t._v(" is changed.")]),t._v(" "),e("li",[t._v("Had some help from Github user @kanerogers to clean up the "),e("a",{attrs:{href:"../beginner/tutorial5-textures"}},[t._v("texturing tutorial")]),t._v(".")]),t._v(" "),e("li",[t._v("I made a "),e("a",{attrs:{href:"../showcase/compute"}},[t._v("compute pipeline showcase")]),t._v(" that computes the tangent and bitangent for each vertex in a model.")]),t._v(" "),e("li",[t._v("I made a "),e("a",{attrs:{href:"../showcase/imgui-demo"}},[t._v("imgui showcase")]),t._v(". It's very basic, but it should be a good starting point.")])]),t._v(" "),e("p",[t._v('Now in the headline, I mentioned a "Content Freeze". Wgpu is still a moving target. The migration from '),e("code",[t._v("0.4")]),t._v(" to "),e("code",[t._v("0.5")]),t._v(" was a lot of work. The same goes for "),e("code",[t._v("0.5")]),t._v(" to "),e("code",[t._v("0.6")]),t._v(". I expect the next migration to be just as much work. As such, I won't be adding much content until the API becomes a bit more stable. That being said, I still plan on resolving any issues with the content.")]),t._v(" "),e("p",[t._v("One more thing. This is actually quite awkward for me (especially since I'll be slowing down development), but I've started a "),e("a",{attrs:{href:"https://www.patreon.com/sotrh",target:"_blank",rel:"noopener noreferrer"}},[t._v("patreon"),e("OutboundLink")],1),t._v(". My job doesn't give me a ton of hours, so things are a bit tight. You are by no means obligated to donate, but I would appreciate it.")]),t._v(" "),e("p",[t._v("You can find out more about contributing to this project on the "),e("RouterLink",{attrs:{to:"/news/#contribution-and-support"}},[t._v("introduction page")])],1),t._v(" "),e("h2",{attrs:{id:"_0-6"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#_0-6"}},[t._v("#")]),t._v(" 0.6")]),t._v(" "),e("p",[t._v("This took me way too long. The changes weren't difficult, but I had to do a lot of copy pasting. The main changes are using "),e("code",[t._v("queue.write_buffer()")]),t._v(" and "),e("code",[t._v("queue.write_texture()")]),t._v(" everywhere. I won't get into the nitty gritty, but you can check out the "),e("a",{attrs:{href:"https://github.com/sotrh/learn-wgpu/pull/90",target:"_blank",rel:"noopener noreferrer"}},[t._v("pull request"),e("OutboundLink")],1),t._v(" if you're interested.")]),t._v(" "),e("h2",{attrs:{id:"added-pong-showcase"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#added-pong-showcase"}},[t._v("#")]),t._v(" Added Pong Showcase")]),t._v(" "),e("p",[e("RouterLink",{attrs:{to:"/news/showcase/pong/"}},[t._v("See it here")])],1),t._v(" "),e("h2",{attrs:{id:"normal-mapping"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#normal-mapping"}},[t._v("#")]),t._v(" Normal mapping")]),t._v(" "),e("p",[t._v('My perfectionism got in my way a bit with this one. I wasn\'t sure that what I was getting was "physically accurate", but it seems to look good.')]),t._v(" "),e("p",[e("img",{attrs:{src:a(381),alt:""}})]),t._v(" "),e("h2",{attrs:{id:"_0-5"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#_0-5"}},[t._v("#")]),t._v(" 0.5!")]),t._v(" "),e("p",[t._v("Too many things changed to make note of them here. Check out "),e("a",{attrs:{href:"https://github.com/sotrh/learn-wgpu/pull/29",target:"_blank",rel:"noopener noreferrer"}},[t._v("the 0.5 pull request"),e("OutboundLink")],1),t._v(" if you're curious about specifics. That being said, 2 things are worth mentioning directly: the y-axis now points up like with DirectX and Metal, and requesting an adapter and creating a device now use "),e("code",[t._v("Future")]),t._v("s. The tutorials have been updated as well as the code.")]),t._v(" "),e("h2",{attrs:{id:"reworked-lighting-tutorial"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#reworked-lighting-tutorial"}},[t._v("#")]),t._v(" Reworked lighting tutorial")]),t._v(" "),e("p",[t._v("The "),e("RouterLink",{attrs:{to:"/intermediate/tutorial10-lighting/"}},[t._v("lighting tutorial")]),t._v(" was not up to par, so I redid it.")],1),t._v(" "),e("h2",{attrs:{id:"added-gif-showcase"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#added-gif-showcase"}},[t._v("#")]),t._v(" Added GIF showcase")]),t._v(" "),e("p",[e("RouterLink",{attrs:{to:"/showcase/gifs/"}},[t._v("Creating GIFs")])],1),t._v(" "),e("h2",{attrs:{id:"updated-texture-tutorials"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#updated-texture-tutorials"}},[t._v("#")]),t._v(" Updated texture tutorials")]),t._v(" "),e("p",[t._v("Up to this point, we created textures manually every time. I've pulled out the texture creation code into a new "),e("code",[t._v("texture.rs")]),t._v(" file and included it in every tutorial from the "),e("RouterLink",{attrs:{to:"/beginner/tutorial5-textures/#cleaning-things-up"}},[t._v("textures tutorial")]),t._v(" onward.")],1),t._v(" "),e("h2",{attrs:{id:"fixed-panics-due-to-not-specifying-the-correct-usage"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#fixed-panics-due-to-not-specifying-the-correct-usage"}},[t._v("#")]),t._v(" Fixed panics due to not specifying the correct "),e("code",[t._v("usage")])]),t._v(" "),e("p",[t._v("Wgpu has become more strict about what "),e("code",[t._v("BufferUsages")]),t._v("s and "),e("code",[t._v("TextureUsages")]),t._v("s are required when performing certain operations. For example in the "),e("RouterLink",{attrs:{to:"/intermediate/windowless/"}},[t._v("Wgpu without a window example")]),t._v(", the "),e("code",[t._v("texture_desc")]),t._v(" only specified the usage to by "),e("code",[t._v("COPY_SRC")]),t._v(". This caused a crash when the "),e("code",[t._v("texture")]),t._v(" was used as a render target. Adding "),e("code",[t._v("OUTPUT_ATTACHMENT")]),t._v(" fixed the issue.")],1),t._v(" "),e("h2",{attrs:{id:"updating-winit-from-0-20-0-alpha5-to-0-20"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#updating-winit-from-0-20-0-alpha5-to-0-20"}},[t._v("#")]),t._v(" Updating Winit from 0.20.0-alpha5 to 0.20")]),t._v(" "),e("p",[t._v("There were a lot of small changes to how the dpi stuff works. You can see all the changes "),e("a",{attrs:{href:"https://github.com/rust-windowing/winit/blob/master/CHANGELOG.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("in the changelog"),e("OutboundLink")],1),t._v(". That means that some of the tutorials had to change.")]),t._v(" "),e("ul",[e("li",[t._v("I've removed "),e("code",[t._v("hidpi_factor")]),t._v(" from "),e("code",[t._v("State")]),t._v(" entirely. They removed the "),e("code",[t._v("hidpi_factor()")]),t._v(" method from "),e("code",[t._v("winit::window::Window")]),t._v(", and changed "),e("code",[t._v("inner_size()")]),t._v(" to return "),e("code",[t._v("PhysicalSize")]),t._v(" instead of "),e("code",[t._v("LogicalSize")]),t._v(", so we don't need to store the "),e("code",[t._v("hidpi_factor")]),t._v(" anymore.")]),t._v(" "),e("li",[e("code",[t._v("update_hidpi_and_resize")]),t._v(" is no more. 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I've changed it to the standardized form now.")]),t._v(" "),e("h2",{attrs:{id:"updating-to-0-4-from-0-3"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#updating-to-0-4-from-0-3"}},[t._v("#")]),t._v(" Updating to 0.4 from 0.3")]),t._v(" "),e("p",[t._v("There are a few things that have changed:")]),t._v(" "),e("ol",[e("li",[t._v("The use of "),e("code",[t._v("Instance")]),t._v(" has been removed. 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I created a "),t("code",[A._v("SoundPack")]),A._v(" class to store the sounds. Deciding how to get the sounds to play took some thinking. I chose to pass in a "),t("code",[A._v("Vec")]),A._v(" into the "),t("code",[A._v("update_state")]),A._v(" method. The system would then push an event to the "),t("code",[A._v("Vec")]),A._v(". 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I could have kept the old format by using wasm-bindgen directly, but I ran into issues with using the wrong version of wasm-bindgen, so I elected to stick with wasm-pack.")]),A._v(" "),t("p",[A._v("In order for wasm-pack to work properly I first needed to add some dependencies:")]),A._v(" "),t("div",{staticClass:"language-toml[dependencies] extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[A._v('cfg-if = "1"\nenv_logger = "0.10"\nwinit = "0.28"\nanyhow = "1.0"\nbytemuck = { version = "1.12", features = [ "derive" ] }\ncgmath = "0.18"\npollster = "0.3"\nwgpu = { version = "0.18", features = ["spirv"]}\nwgpu_glyph = "0.18"\nrand = "0.8"\nrodio = { version = "0.15", default-features = false, features = ["wav"] }\nlog = "0.4"\ninstant = "0.1"\n\n[target.\'cfg(target_arch = "wasm32")\'.dependencies]\nconsole_error_panic_hook = "0.1.6"\nconsole_log = "1.0"\ngetrandom = { version = "0.2", features = ["js"] }\nrodio = { version = "0.15", default-features = false, features = ["wasm-bindgen", "wav"] }\nwasm-bindgen-futures = "0.4.20"\nwasm-bindgen = "=0.2.87"\nweb-sys = { version = "0.3.53", features = [\n "Document",\n "Window",\n "Element",\n]}\nwgpu = { version = "0.18", features = ["spirv", "webgl"]}\n\n[build-dependencies]\nanyhow = "1.0"\nfs_extra = "1.2"\nglob = "0.3"\nrayon = "1.4"\nnaga = { version = "0.9", features = ["glsl-in", "spv-out", "wgsl-out"]}\n\n')])])]),t("p",[A._v("I'll highlight a few of these:")]),A._v(" "),t("ul",[t("li",[A._v("rand: If you want to use rand on the web, you need to include getrandom directly and enable its "),t("code",[A._v("js")]),A._v(" feature.")]),A._v(" "),t("li",[A._v("rodio: I had to disable all of the features for the WASM build, and then enabled them separately. 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If you are building using the wasm-bindgen command you need to make sure that the command version of wasm-bindgen matches the version in Cargo.toml "),t("strong",[A._v("exactly")]),A._v(" otherwise you'll have problems. If you use wasm-pack it will download the appropriate wasm-bindgen binary to use for your crate.")]),A._v(" "),t("li",[A._v('web-sys: This has functions and types that allow you to use different methods available in js such as "getElementById()".')])]),A._v(" "),t("p",[A._v("Now that that's out of the way let's talk about some code. 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It was overly architected, and kinda hard to make changes, but a good experience nonetheless.")]),A._v(" "),t("p",[A._v("Try the code down below! 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I created a "),t("code",[A._v("SoundPack")]),A._v(" class to store the sounds. Deciding how to get the sounds to play took some thinking. I chose to pass in a "),t("code",[A._v("Vec")]),A._v(" into the "),t("code",[A._v("update_state")]),A._v(" method. The system would then push an event to the "),t("code",[A._v("Vec")]),A._v(". 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I could have kept the old format by using wasm-bindgen directly, but I ran into issues with using the wrong version of wasm-bindgen, so I elected to stick with wasm-pack.")]),A._v(" "),t("p",[A._v("In order for wasm-pack to work properly I first needed to add some dependencies:")]),A._v(" "),t("div",{staticClass:"language-toml[dependencies] extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[A._v('cfg-if = "1"\nenv_logger = "0.10"\nwinit = "0.28"\nanyhow = "1.0"\nbytemuck = { version = "1.12", features = [ "derive" ] }\ncgmath = "0.18"\npollster = "0.3"\nwgpu = { version = "0.18", features = ["spirv"]}\nwgpu_glyph = "0.18"\nrand = "0.8"\nrodio = { version = "0.15", default-features = false, features = ["wav"] }\nlog = "0.4"\ninstant = "0.1"\n\n[target.\'cfg(target_arch = "wasm32")\'.dependencies]\nconsole_error_panic_hook = "0.1.6"\nconsole_log = "1.0"\ngetrandom = { version = "0.2", features = ["js"] }\nrodio = { version = "0.15", default-features = false, features = ["wasm-bindgen", "wav"] }\nwasm-bindgen-futures = "0.4.20"\nwasm-bindgen = "=0.2.87"\nweb-sys = { version = "0.3.53", features = [\n "Document",\n "Window",\n "Element",\n]}\nwgpu = { version = "0.18", features = ["spirv", "webgl"]}\n\n[build-dependencies]\nanyhow = "1.0"\nfs_extra = "1.2"\nglob = "0.3"\nrayon = "1.4"\nnaga = { version = "0.9", features = ["glsl-in", "spv-out", "wgsl-out"]}\n\n')])])]),t("p",[A._v("I'll highlight a few of these:")]),A._v(" "),t("ul",[t("li",[A._v("rand: If you want to use rand on the web, you need to include getrandom directly and enable its "),t("code",[A._v("js")]),A._v(" feature.")]),A._v(" "),t("li",[A._v("rodio: I had to disable all of the features for the WASM build, and then enabled them separately. 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If you are building using the wasm-bindgen command you need to make sure that the command version of wasm-bindgen matches the version in Cargo.toml "),t("strong",[A._v("exactly")]),A._v(" otherwise you'll have problems. If you use wasm-pack it will download the appropriate wasm-bindgen binary to use for your crate.")]),A._v(" "),t("li",[A._v('web-sys: This has functions and types that allow you to use different methods available in js such as "getElementById()".')])]),A._v(" "),t("p",[A._v("Now that that's out of the way let's talk about some code. 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zr(Object.assign(n,{router:r,render:e=>e("div",{attrs:{id:"app"}},[e("RouterView",{ref:"layout"}),e("div",{class:"global-ui"},Uf.map(t=>e(t)))])})),router:r}}(!1).then(({app:e,router:t})=>{t.onReady(()=>{e.$mount("#app")})})}]); \ No newline at end of file diff --git a/beginner/tutorial1-window/index.html b/beginner/tutorial1-window/index.html index f45b19447..817c9f610 100644 --- a/beginner/tutorial1-window/index.html +++ b/beginner/tutorial1-window/index.html @@ -8,7 +8,7 @@ - + @@ -139,7 +139,7 @@ </body> </html> -

Press the button below, and you will see the code running!

Check out the code! (opens new window)
Last Updated: 12/27/2023, 9:52:25 PM

+

Press the button below, and you will see the code running!

Check out the code! (opens new window)
Last Updated: 1/20/2024, 10:13:50 PM

← →

- + diff --git a/beginner/tutorial2-surface/index.html b/beginner/tutorial2-surface/index.html index e05d36e6e..14b83d5fd 100644 --- a/beginner/tutorial2-surface/index.html +++ b/beginner/tutorial2-surface/index.html @@ -8,7 +8,7 @@ - + @@ -333,7 +333,7 @@ store: wgpu::StoreOp::Store, }, }) -

The RenderPassColorAttachment has the view field, which informs wgpu what texture to save the colors to. In this case, we specify the view that we created using surface.get_current_texture(). This means that any colors we draw to this attachment will get drawn to the screen.

The resolve_target is the texture that will receive the resolved output. This will be the same as view unless multisampling is enabled. We don't need to specify this, so we leave it as None.

The ops field takes a wpgu::Operations object. This tells wgpu what to do with the colors on the screen (specified by view). The load field tells wgpu how to handle colors stored from the previous frame. Currently, we are clearing the screen with a bluish color. The store field tells wgpu whether we want to store the rendered results to the Texture behind our TextureView (in this case, it's the SurfaceTexture). We use StoreOp::Store as we do want to store our render results.

It's not uncommon to not clear the screen if the screen is going to be completely covered up with objects. If your scene doesn't cover the entire screen, however, you can end up with something like this.

./no-clear.png

# Validation Errors?

If wgpu is using Vulkan on your machine, you may run into validation errors if you are running an older version of the Vulkan SDK. You should be using at least version 1.2.182 as older versions can give out some false positives. If errors persist, you may have encountered a bug in wgpu. You can post an issue at https://github.com/gfx-rs/wgpu (opens new window)

# Challenge

Modify the input() method to capture mouse events, and update the clear color using that. Hint: you'll probably need to use WindowEvent::CursorMoved.

Check out the code! (opens new window)
Last Updated: 12/27/2023, 9:52:25 PM

+

The RenderPassColorAttachment has the view field, which informs wgpu what texture to save the colors to. In this case, we specify the view that we created using surface.get_current_texture(). This means that any colors we draw to this attachment will get drawn to the screen.

The resolve_target is the texture that will receive the resolved output. This will be the same as view unless multisampling is enabled. We don't need to specify this, so we leave it as None.

The ops field takes a wpgu::Operations object. This tells wgpu what to do with the colors on the screen (specified by view). The load field tells wgpu how to handle colors stored from the previous frame. Currently, we are clearing the screen with a bluish color. The store field tells wgpu whether we want to store the rendered results to the Texture behind our TextureView (in this case, it's the SurfaceTexture). We use StoreOp::Store as we do want to store our render results.

It's not uncommon to not clear the screen if the screen is going to be completely covered up with objects. If your scene doesn't cover the entire screen, however, you can end up with something like this.

./no-clear.png

# Validation Errors?

If wgpu is using Vulkan on your machine, you may run into validation errors if you are running an older version of the Vulkan SDK. You should be using at least version 1.2.182 as older versions can give out some false positives. If errors persist, you may have encountered a bug in wgpu. You can post an issue at https://github.com/gfx-rs/wgpu (opens new window)

# Challenge

Modify the input() method to capture mouse events, and update the clear color using that. Hint: you'll probably need to use WindowEvent::CursorMoved.

Check out the code! (opens new window)
Last Updated: 1/20/2024, 10:13:50 PM

← →

- + diff --git a/beginner/tutorial3-pipeline/index.html b/beginner/tutorial3-pipeline/index.html index 1a8826e36..428a9f32b 100644 --- a/beginner/tutorial3-pipeline/index.html +++ b/beginner/tutorial3-pipeline/index.html @@ -8,7 +8,7 @@ - + @@ -162,7 +162,7 @@ render_pass.draw(0..3, 0..1); // 3. } // ... -

We didn't change much, but let's talk about what we did change.

  1. We renamed _render_pass to render_pass and made it mutable.
  2. We set the pipeline on the render_pass using the one we just created.
  3. We tell wgpu to draw something with three vertices and one instance. This is where @builtin(vertex_index) comes from.

With all that you should be seeing a lovely brown triangle.

Said lovely brown triangle

# Challenge

Create a second pipeline that uses the triangle's position data to create a color that it then sends to the fragment shader. Have the app swap between these when you press the spacebar. Hint: you'll need to modify VertexOutput

Check out the code! (opens new window)
Last Updated: 12/27/2023, 9:52:25 PM

+

We didn't change much, but let's talk about what we did change.

  1. We renamed _render_pass to render_pass and made it mutable.
  2. We set the pipeline on the render_pass using the one we just created.
  3. We tell wgpu to draw something with three vertices and one instance. This is where @builtin(vertex_index) comes from.

With all that you should be seeing a lovely brown triangle.

Said lovely brown triangle

# Challenge

Create a second pipeline that uses the triangle's position data to create a color that it then sends to the fragment shader. Have the app swap between these when you press the spacebar. Hint: you'll need to modify VertexOutput

Check out the code! (opens new window)
Last Updated: 1/20/2024, 10:13:50 PM

← →

- + diff --git a/beginner/tutorial4-buffer/index.html b/beginner/tutorial4-buffer/index.html index 94163061c..afcf79e13 100644 --- a/beginner/tutorial4-buffer/index.html +++ b/beginner/tutorial4-buffer/index.html @@ -8,7 +8,7 @@ - + @@ -259,7 +259,7 @@ render_pass.set_vertex_buffer(0, self.vertex_buffer.slice(..)); render_pass.set_index_buffer(self.index_buffer.slice(..), wgpu::IndexFormat::Uint16); // 1. render_pass.draw_indexed(0..self.num_indices, 0, 0..1); // 2. -

A couple of things to note:

  1. The method name is set_index_buffer, not set_index_buffers. You can only have one index buffer set at a time.
  2. When using an index buffer, you need to use draw_indexed. The draw method ignores the index buffer. Also, make sure you use the number of indices (num_indices), not vertices, as your model will either draw wrong or the method will panic because there are not enough indices.

With all that you should have a garishly magenta pentagon in your window.

Magenta pentagon in window

# Color Correction

If you use a color picker on the magenta pentagon, you'll get a hex value of #BC00BC. If you convert this to RGB values, you'll get (188, 0, 188). Dividing these values by 255 to get them into the [0, 1] range, we get roughly (0.737254902, 0, 0.737254902). This is not the same as what we are using for our vertex colors, which is (0.5, 0.0, 0.5). The reason for this has to do with color spaces.

Most monitors use a color space known as sRGB. Our surface is (most likely depending on what is returned from surface.get_preferred_format()) using an sRGB texture format. The sRGB format stores colors according to their relative brightness instead of their actual brightness. The reason for this is that our eyes don't perceive light linearly. We notice more differences in darker colors than in lighter colors.

You get the correct color using the following formula: srgb_color = ((rgb_color / 255 + 0.055) / 1.055) ^ 2.4. Doing this with an RGB value of (188, 0, 188) will give us (0.5028864580325687, 0.0, 0.5028864580325687). A little off from our (0.5, 0.0, 0.5). Instead of doing a manual color conversion, you'll likely save a lot of time by using textures instead, as they are stored as sRGB by default, so they don't suffer from the same color inaccuracies that vertex colors do. We'll cover textures in the next lesson.

# Challenge

Create a more complex shape than the one we made (aka. more than three triangles) using a vertex buffer and an index buffer. Toggle between the two with the space key.

Check out the code! (opens new window)
Last Updated: 12/27/2023, 9:52:25 PM

+

A couple of things to note:

  1. The method name is set_index_buffer, not set_index_buffers. You can only have one index buffer set at a time.
  2. When using an index buffer, you need to use draw_indexed. The draw method ignores the index buffer. Also, make sure you use the number of indices (num_indices), not vertices, as your model will either draw wrong or the method will panic because there are not enough indices.

With all that you should have a garishly magenta pentagon in your window.

Magenta pentagon in window

# Color Correction

If you use a color picker on the magenta pentagon, you'll get a hex value of #BC00BC. If you convert this to RGB values, you'll get (188, 0, 188). Dividing these values by 255 to get them into the [0, 1] range, we get roughly (0.737254902, 0, 0.737254902). This is not the same as what we are using for our vertex colors, which is (0.5, 0.0, 0.5). The reason for this has to do with color spaces.

Most monitors use a color space known as sRGB. Our surface is (most likely depending on what is returned from surface.get_preferred_format()) using an sRGB texture format. The sRGB format stores colors according to their relative brightness instead of their actual brightness. The reason for this is that our eyes don't perceive light linearly. We notice more differences in darker colors than in lighter colors.

You get the correct color using the following formula: srgb_color = ((rgb_color / 255 + 0.055) / 1.055) ^ 2.4. Doing this with an RGB value of (188, 0, 188) will give us (0.5028864580325687, 0.0, 0.5028864580325687). A little off from our (0.5, 0.0, 0.5). Instead of doing a manual color conversion, you'll likely save a lot of time by using textures instead, as they are stored as sRGB by default, so they don't suffer from the same color inaccuracies that vertex colors do. We'll cover textures in the next lesson.

# Challenge

Create a more complex shape than the one we made (aka. more than three triangles) using a vertex buffer and an index buffer. Toggle between the two with the space key.

Check out the code! (opens new window)
Last Updated: 1/20/2024, 10:13:50 PM

← →

- + diff --git a/beginner/tutorial5-textures/index.html b/beginner/tutorial5-textures/index.html index bdf2aad2c..84832c4a8 100644 --- a/beginner/tutorial5-textures/index.html +++ b/beginner/tutorial5-textures/index.html @@ -8,7 +8,7 @@ - + @@ -404,7 +404,7 @@ } } } -

Phew!

With these changes in place, the code should be working the same as before, but we now have a much easier way to create textures.

# Challenge

Create another texture and swap it out when you press the space key.

Check out the code! (opens new window)
Last Updated: 12/27/2023, 9:52:25 PM

+

Phew!

With these changes in place, the code should be working the same as before, but we now have a much easier way to create textures.

# Challenge

Create another texture and swap it out when you press the space key.

Check out the code! (opens new window)
Last Updated: 1/20/2024, 10:13:50 PM

← →

- + diff --git a/beginner/tutorial6-uniforms/index.html b/beginner/tutorial6-uniforms/index.html index d184c9007..a3302d8c3 100644 --- a/beginner/tutorial6-uniforms/index.html +++ b/beginner/tutorial6-uniforms/index.html @@ -8,7 +8,7 @@ - + @@ -312,7 +312,7 @@ self.camera_uniform.update_view_proj(&self.camera); self.queue.write_buffer(&self.camera_buffer, 0, bytemuck::cast_slice(&[self.camera_uniform])); } -

That's all we need to do. If you run the code now, you should see a pentagon with our tree texture that you can rotate around and zoom into with the wasd/arrow keys.

# Challenge

Have our model rotate on its own independently of the camera. Hint: you'll need another matrix for this.

Check out the code! (opens new window)
Last Updated: 12/27/2023, 9:52:25 PM

+

That's all we need to do. If you run the code now, you should see a pentagon with our tree texture that you can rotate around and zoom into with the wasd/arrow keys.

# Challenge

Have our model rotate on its own independently of the camera. Hint: you'll need another matrix for this.

Check out the code! (opens new window)
Last Updated: 1/20/2024, 10:13:50 PM

← →

- + diff --git a/beginner/tutorial7-instancing/index.html b/beginner/tutorial7-instancing/index.html index 5ac58ed34..e3f79c831 100644 --- a/beginner/tutorial7-instancing/index.html +++ b/beginner/tutorial7-instancing/index.html @@ -8,7 +8,7 @@ - + @@ -171,7 +171,7 @@ out.clip_position = camera.view_proj * model_matrix * vec4<f32>(model.position, 1.0); return out; } -

With all that done, we should have a forest of trees!

./forest.png

# Challenge

Modify the position and/or rotation of the instances every frame.

Check out the code! (opens new window)
Last Updated: 12/27/2023, 9:52:25 PM

+

With all that done, we should have a forest of trees!

./forest.png

# Challenge

Modify the position and/or rotation of the instances every frame.

Check out the code! (opens new window)
Last Updated: 1/20/2024, 10:13:50 PM

← →

- + diff --git a/beginner/tutorial8-depth/index.html b/beginner/tutorial8-depth/index.html index fe54be429..f92d5c359 100644 --- a/beginner/tutorial8-depth/index.html +++ b/beginner/tutorial8-depth/index.html @@ -8,7 +8,7 @@ - + @@ -112,7 +112,7 @@ stencil_ops: None, }), }); -

And that's all we have to do! No shader code is needed! If you run the application, the depth issues will be fixed.

forest_fixed.png

# Challenge

Since the depth buffer is a texture, we can sample it in the shader. Because it's a depth texture, we'll have to use the sampler_comparison uniform type and the textureSampleCompare function instead of sampler and sampler2D respectively. Create a bind group for the depth texture (or reuse an existing one), and render it to the screen.

Check out the code! (opens new window)
Last Updated: 12/27/2023, 9:52:25 PM

+

And that's all we have to do! No shader code is needed! If you run the application, the depth issues will be fixed.

forest_fixed.png

# Challenge

Since the depth buffer is a texture, we can sample it in the shader. Because it's a depth texture, we'll have to use the sampler_comparison uniform type and the textureSampleCompare function instead of sampler and sampler2D respectively. Create a bind group for the depth texture (or reuse an existing one), and render it to the screen.

Check out the code! (opens new window)
Last Updated: 1/20/2024, 10:13:50 PM

← →

- + diff --git a/beginner/tutorial9-models/index.html b/beginner/tutorial9-models/index.html index a8b22277a..60490bef5 100644 --- a/beginner/tutorial9-models/index.html +++ b/beginner/tutorial9-models/index.html @@ -8,7 +8,7 @@ - + @@ -245,7 +245,7 @@ m.mesh.positions[i * 3 + 1], m.mesh.positions[i * 3 + 2], ], - tex_coords: [m.mesh.texcoords[i * 2], m.mesh.texcoords[i * 2 + 1]], + tex_coords: [m.mesh.texcoords[i * 2], 1.0 - m.mesh.texcoords[i * 2 + 1]], normal: [ m.mesh.normals[i * 3], m.mesh.normals[i * 3 + 1], @@ -411,7 +411,7 @@

The code in lib.rs will change accordingly.

render_pass.set_vertex_buffer(1, self.instance_buffer.slice(..));
 render_pass.set_pipeline(&self.render_pipeline);
 render_pass.draw_model_instanced(&self.obj_model, 0..self.instances.len() as u32, &self.camera_bind_group);
-
Check out the code! (opens new window)
Last Updated: 12/27/2023, 9:52:25 PM

+

Check out the code! (opens new window)
Last Updated: 1/20/2024, 10:13:50 PM

← →

- + diff --git a/c647d563b62e7aa135b2.module.wasm b/c647d563b62e7aa135b2.module.wasm new file mode 100644 index 000000000..c3b27fa64 Binary files /dev/null and b/c647d563b62e7aa135b2.module.wasm differ diff --git a/cd654cff24f9679296af.module.wasm b/cd654cff24f9679296af.module.wasm new file mode 100644 index 000000000..ad4eb79b0 Binary files /dev/null and b/cd654cff24f9679296af.module.wasm differ diff --git a/d067d0cf1e0a7404a1f4.module.wasm b/d067d0cf1e0a7404a1f4.module.wasm deleted file mode 100644 index 26502e43a..000000000 Binary files a/d067d0cf1e0a7404a1f4.module.wasm and /dev/null differ diff --git a/d86566f33755bcff2c58.module.wasm b/d86566f33755bcff2c58.module.wasm new file mode 100644 index 000000000..3f342490b Binary files /dev/null and b/d86566f33755bcff2c58.module.wasm differ diff --git a/d97281fb699f0f310919.module.wasm b/d97281fb699f0f310919.module.wasm deleted file mode 100644 index 7704e1fa1..000000000 Binary files a/d97281fb699f0f310919.module.wasm and /dev/null differ diff --git a/6aedf8224dc13b5d0a82.module.wasm b/db7bc65eef98067d8211.module.wasm similarity index 76% rename from 6aedf8224dc13b5d0a82.module.wasm rename to db7bc65eef98067d8211.module.wasm index 0cc3785f2..a9008e227 100644 Binary files a/6aedf8224dc13b5d0a82.module.wasm and b/db7bc65eef98067d8211.module.wasm differ diff --git a/dbc238f3b2a972436c43.module.wasm b/dbc238f3b2a972436c43.module.wasm deleted file mode 100644 index 2f05522d8..000000000 Binary files a/dbc238f3b2a972436c43.module.wasm and /dev/null differ diff --git a/fd2282b68a5c4113609e.module.wasm b/fd2282b68a5c4113609e.module.wasm new file mode 100644 index 000000000..7c268fe16 Binary files /dev/null and b/fd2282b68a5c4113609e.module.wasm differ diff --git a/index.html b/index.html index fb6f11ded..a99137e65 100644 --- a/index.html +++ b/index.html @@ -8,15 +8,15 @@ - + -
Learn Wgpu

# Introduction

# What is wgpu?

Wgpu (opens new window) is a Rust implementation of the WebGPU API spec (opens new window). WebGPU is a specification published by the GPU for the Web Community Group. It aims to allow web code access to GPU functions in a safe and reliable manner. It does this by mimicking the Vulkan API, and translating that down to whatever API the host hardware is using (ie. DirectX, Metal, Vulkan).

Wgpu is still in development, so some of this doc is subject to change.

# Why Rust?

Wgpu actually has C bindings to allow you to write C/C++ code with it, as well as use other languages that interface with C. That being said, wgpu is written in Rust, and it has some convenient Rust bindings that don't have to jump through any hoops. On top of that, I've been enjoying writing in Rust.

You should be fairly familiar with Rust before using this tutorial as I won't go into much detail on Rust syntax. If you're not super comfortable with Rust you can review the Rust tutorial (opens new window). You should also be familiar with Cargo (opens new window).

I'm using this project to learn wgpu myself, so I might miss some important details, or explain things badly. I'm always open to constructive feedback.

# Contribution and Support

  • I accept pull requests (GitHub repo (opens new window)) for fixing issues with this tutorial such as typos, incorrect information, and other inconsistencies.
  • Due to wgpu's rapidly changing api, I'm not accepting any new pull requests for showcase demos.
  • If you want to support me directly, check out my patreon (opens new window)!

# Translations

# Special thanks to these patrons!

  • David Laban
  • Lennart
  • Ian Gowen
  • Aron Granberg
  • Bernard Llanos
  • Jan Šipr
  • Zeh Fernando
  • Youngsuk Kim
  • オリトイツキ
  • Andrea Postal
  • Julius Liu
  • Feng Liang
  • Mattia Samiolo
  • Joris Willems
  • Jani Turkia
  • papyDoctor
  • Filip
Last Updated: 12/27/2023, 9:52:25 PM

+

Learn Wgpu

# Introduction

# What is wgpu?

Wgpu (opens new window) is a Rust implementation of the WebGPU API spec (opens new window). WebGPU is a specification published by the GPU for the Web Community Group. It aims to allow web code access to GPU functions in a safe and reliable manner. It does this by mimicking the Vulkan API, and translating that down to whatever API the host hardware is using (ie. DirectX, Metal, Vulkan).

Wgpu is still in development, so some of this doc is subject to change.

# Why Rust?

Wgpu actually has C bindings to allow you to write C/C++ code with it, as well as use other languages that interface with C. That being said, wgpu is written in Rust, and it has some convenient Rust bindings that don't have to jump through any hoops. On top of that, I've been enjoying writing in Rust.

You should be fairly familiar with Rust before using this tutorial as I won't go into much detail on Rust syntax. If you're not super comfortable with Rust you can review the Rust tutorial (opens new window). You should also be familiar with Cargo (opens new window).

I'm using this project to learn wgpu myself, so I might miss some important details, or explain things badly. I'm always open to constructive feedback.

# Contribution and Support

  • I accept pull requests (GitHub repo (opens new window)) for fixing issues with this tutorial such as typos, incorrect information, and other inconsistencies.
  • Due to wgpu's rapidly changing api, I'm not accepting any new pull requests for showcase demos.
  • If you want to support me directly, check out my patreon (opens new window)!

# Translations

# Special thanks to these patrons!

  • David Laban
  • Lennart
  • Ian Gowen
  • Aron Granberg
  • Bernard Llanos
  • Jan Šipr
  • Zeh Fernando
  • Youngsuk Kim
  • オリトイツキ
  • Andrea Postal
  • Julius Liu
  • Feng Liang
  • Mattia Samiolo
  • Joris Willems
  • Jani Turkia
  • papyDoctor
  • Filip
Last Updated: 1/20/2024, 10:13:50 PM

Dependencies and the window →

- + diff --git a/intermediate/pbr-notes.html b/intermediate/pbr-notes.html index bf7252451..30c236fa7 100644 --- a/intermediate/pbr-notes.html +++ b/intermediate/pbr-notes.html @@ -8,11 +8,11 @@ - + -
Learn Wgpu

# Sources

  • https://www.scratchapixel.com/lessons/3d-basic-rendering/introduction-to-shading/diffuse-lambertian-shading
  • http://jimmiejohnsson84.me/pages/rendering_pbr.html
Last Updated: 12/27/2023, 9:52:25 PM
- +
Learn Wgpu

# Sources

  • https://www.scratchapixel.com/lessons/3d-basic-rendering/introduction-to-shading/diffuse-lambertian-shading
  • http://jimmiejohnsson84.me/pages/rendering_pbr.html
Last Updated: 1/20/2024, 10:13:50 PM
+ diff --git a/intermediate/tutorial10-lighting/index.html b/intermediate/tutorial10-lighting/index.html index 6a302c9e6..8398e452d 100644 --- a/intermediate/tutorial10-lighting/index.html +++ b/intermediate/tutorial10-lighting/index.html @@ -8,7 +8,7 @@ - + @@ -625,7 +625,7 @@ let half_dir = normalize(view_dir + light_dir); let specular_strength = pow(max(dot(in.world_normal, half_dir), 0.0), 32.0); -

It's hard to tell the difference, but here are the results.

./half_dir.png

Check out the code! (opens new window)
Last Updated: 12/27/2023, 9:52:25 PM

+

It's hard to tell the difference, but here are the results.

./half_dir.png

Check out the code! (opens new window)
Last Updated: 1/20/2024, 10:13:50 PM

← →

- + diff --git a/intermediate/tutorial11-normals/index.html b/intermediate/tutorial11-normals/index.html index 3092df0cf..336b208b7 100644 --- a/intermediate/tutorial11-normals/index.html +++ b/intermediate/tutorial11-normals/index.html @@ -8,7 +8,7 @@ - + @@ -181,7 +181,7 @@ m.mesh.positions[i * 3 + 1], m.mesh.positions[i * 3 + 2], ], - tex_coords: [m.mesh.texcoords[i * 2], m.mesh.texcoords[i * 2 + 1]], + tex_coords: [m.mesh.texcoords[i * 2], 1.0 - m.mesh.texcoords[i * 2 + 1]], normal: [ m.mesh.normals[i * 3], m.mesh.normals[i * 3 + 1], @@ -475,7 +475,7 @@ &self.camera_bind_group, &self.light_bind_group, ); -

That gives us something like this.

You can find the textures I use in the GitHub Repository.

Check out the code! (opens new window)
Last Updated: 12/27/2023, 9:52:25 PM

+

That gives us something like this.

You can find the textures I use in the GitHub Repository.

Check out the code! (opens new window)
Last Updated: 1/20/2024, 10:13:50 PM

← →

- + diff --git a/intermediate/tutorial12-camera/index.html b/intermediate/tutorial12-camera/index.html index 90f866f3d..bbc25d89d 100644 --- a/intermediate/tutorial12-camera/index.html +++ b/intermediate/tutorial12-camera/index.html @@ -8,7 +8,7 @@ - + @@ -370,7 +370,7 @@ } }); } -

With that, we should be able to move our camera wherever we want.

./screenshot.png

Check out the code! (opens new window)
Last Updated: 12/27/2023, 9:52:25 PM

+

With that, we should be able to move our camera wherever we want.

./screenshot.png

Check out the code! (opens new window)
Last Updated: 1/20/2024, 10:13:50 PM

← →

- + diff --git a/intermediate/tutorial13-hdr/index.html b/intermediate/tutorial13-hdr/index.html index 7775900c9..6128d2575 100644 --- a/intermediate/tutorial13-hdr/index.html +++ b/intermediate/tutorial13-hdr/index.html @@ -8,7 +8,7 @@ - + @@ -967,7 +967,7 @@ return vec4<f32>(result, object_color.a); } -

A little note on the reflection math. The view_dir gives us the direction to the camera from the surface. The reflection math needs the direction from the camera to the surface, so we negate view_dir. We then use wgsl's built-in reflect function to reflect the inverted view_dir about the world_normal. This gives us a direction that we can use to sample the environment map and get the color of the sky in that direction. Just looking at the reflection component gives us the following:

just-reflections

Here's the finished scene:

with-reflections

# Demo

If your browser doesn't support WebGPU, this example won't work for you.

Check out the code! (opens new window)
Last Updated: 12/27/2023, 9:52:25 PM

+

A little note on the reflection math. The view_dir gives us the direction to the camera from the surface. The reflection math needs the direction from the camera to the surface, so we negate view_dir. We then use wgsl's built-in reflect function to reflect the inverted view_dir about the world_normal. This gives us a direction that we can use to sample the environment map and get the color of the sky in that direction. Just looking at the reflection component gives us the following:

just-reflections

Here's the finished scene:

with-reflections

# Demo

If your browser doesn't support WebGPU, this example won't work for you.

Check out the code! (opens new window)
Last Updated: 1/20/2024, 10:13:50 PM

← →

- + diff --git a/intermediate/wip-terrain/index.html b/intermediate/wip-terrain/index.html index 95f19c81e..e06bbc8e9 100644 --- a/intermediate/wip-terrain/index.html +++ b/intermediate/wip-terrain/index.html @@ -8,7 +8,7 @@ - + @@ -123,7 +123,7 @@ gen_terrain(global_invocation_id)

If you want to learn more about workgroups, check out the docs (opens new window).

TODO:

  • Note changes to create_render_pipeline
  • Mention swizzle feature for cgmath
  • Compare workgroups and workgroups sizes to nested for-loops -
    • Maybe make a diagram in Blender?
  • Change to camera movement speed
Last Updated: 12/27/2023, 9:52:25 PM
- +
  • Maybe make a diagram in Blender?
  • Change to camera movement speed
    • Last Updated: 1/20/2024, 10:13:50 PM
    + diff --git a/news/0.12/index.html b/news/0.12/index.html index c11576015..e48bebf4c 100644 --- a/news/0.12/index.html +++ b/news/0.12/index.html @@ -8,7 +8,7 @@ - + @@ -50,7 +50,7 @@ breaks glob imports (aka. use anyhow::*), I had to switch qualified imports and uses (ie. anyhow::Result). This was mostly an issue on my build scripts for some of the showcase examples.

    The main tutorial examples weren't affected, and the changes are minor, so -if you're curious feel free to look at the repo.

    Last Updated: 12/27/2023, 9:52:25 PM

    +if you're curious feel free to look at the repo.

    Last Updated: 1/20/2024, 10:13:50 PM

    ← →

    - + diff --git a/news/0.13/index.html b/news/0.13/index.html index ec79b781c..25e130f70 100644 --- a/news/0.13/index.html +++ b/news/0.13/index.html @@ -8,7 +8,7 @@ - + @@ -47,7 +47,7 @@ } output_buffer.unmap(); -

    You can explore the reasoning for the change to map_async in this PR (opens new window).

    Another thing to note is that presentation modes need to match what the surface supports. You can get a list of supported modes from Surface::get_surface_modes() (opens new window).

    As always, let me know if I missed anything in the migration process. You can open an issue/submit a PR on the Learn Wgpu repo (opens new window)!

    Last Updated: 12/27/2023, 9:52:25 PM

    +

    You can explore the reasoning for the change to map_async in this PR (opens new window).

    Another thing to note is that presentation modes need to match what the surface supports. You can get a list of supported modes from Surface::get_surface_modes() (opens new window).

    As always, let me know if I missed anything in the migration process. You can open an issue/submit a PR on the Learn Wgpu repo (opens new window)!

    Last Updated: 1/20/2024, 10:13:50 PM

    ← →

    - + diff --git a/news/0.14/index.html b/news/0.14/index.html index 9a02c607b..662162b7f 100644 --- a/news/0.14/index.html +++ b/news/0.14/index.html @@ -8,7 +8,7 @@ - + @@ -21,7 +21,7 @@ alpha_mode: wgpu::CompositeAlphaMode::Auto, // NEW! };

    # Winit updated

    Winit has been updated to version "0.27" so if you build on linux you may need to update some of your packages:

    sudo apt install libfontconfig libfontconfig1-dev
-
    Last Updated: 12/27/2023, 9:52:25 PM

    +

    Last Updated: 1/20/2024, 10:13:50 PM

    ← →

    - + diff --git a/news/0.15/index.html b/news/0.15/index.html index 586a83f90..705e06051 100644 --- a/news/0.15/index.html +++ b/news/0.15/index.html @@ -8,7 +8,7 @@ - + @@ -35,7 +35,7 @@ alpha_mode: surface_caps.alpha_modes[0], view_formats: vec![], }; -

    As always let me know if I missed anything. You can check out the full changelog for 0.15 here (opens new window)

    Last Updated: 12/27/2023, 9:52:25 PM

    +

    As always let me know if I missed anything. You can check out the full changelog for 0.15 here (opens new window)

    Last Updated: 1/20/2024, 10:13:50 PM

    ← →

    - + diff --git a/news/0.16/index.html b/news/0.16/index.html index 0f89cfaad..76d80f589 100644 --- a/news/0.16/index.html +++ b/news/0.16/index.html @@ -8,7 +8,7 @@ - + @@ -42,7 +42,7 @@ "Element", "Location", ]} -

    No other changes need to be made to switch to using WebGPU in browser, so once the WebGPU samples at https://webgpu.github.io/ (opens new window) work in Chrome on Linux, I'll look into removing the webgl feature.

    That's all! As always let me know if I missed anything!

    Last Updated: 12/27/2023, 9:52:25 PM

    +

    No other changes need to be made to switch to using WebGPU in browser, so once the WebGPU samples at https://webgpu.github.io/ (opens new window) work in Chrome on Linux, I'll look into removing the webgl feature.

    That's all! As always let me know if I missed anything!

    Last Updated: 1/20/2024, 10:13:50 PM

    ← →

    - + diff --git a/news/0.17/index.html b/news/0.17/index.html index 7cc4766a5..345114b17 100644 --- a/news/0.17/index.html +++ b/news/0.17/index.html @@ -8,11 +8,11 @@ - + -
    Learn Wgpu

    # Update to 0.17

    No changes needed to the tutorial!

    Last Updated: 12/27/2023, 9:52:25 PM

    +

    - + diff --git a/news/0.18 and hdr/index.html b/news/0.18 and hdr/index.html index fe34305da..8bf50f59f 100644 --- a/news/0.18 and hdr/index.html +++ b/news/0.18 and hdr/index.html @@ -8,7 +8,7 @@ - + @@ -24,7 +24,7 @@ writing a tutorial for them.

    Also, I'm been interested learning how to load HDR images from places like Polyhaven, so I decided to introduce compute shaders by creating one that will load an HDR and -convert it to a Cubemap to be rendered.

    You can check it out here!

    Last Updated: 12/27/2023, 9:52:25 PM
    - +convert it to a Cubemap to be rendered.

    You can check it out here!

    Last Updated: 1/20/2024, 10:13:50 PM
    + diff --git a/news/pre-0.12/index.html b/news/pre-0.12/index.html index 0d6afad3f..268be8971 100644 --- a/news/pre-0.12/index.html +++ b/news/pre-0.12/index.html @@ -8,7 +8,7 @@ - + @@ -43,11 +43,11 @@
    1. The request_device method now returns a (Device, Queue) tuple. This means that you can borrow the Queue mutably while using the Device immutably. Because of this change, submitting CommandBuffers to the queue uses the submit method on the Queue directly.
    self.queue.submit(&[
     encoder.finish()
 ]);
-
    1. The create method on Surface takes in any struct that implements the HasRawWindow trait, instead of a RawWindowHandle. This means that the raw-window-handle = "0.3" line in Cargo.toml is no longer needed.

    I don't know if this is a change from 0.4, but you use wgpu = "0.4" line in dependencies instead of the [dependencies.wgpu] as wgpu will determine the best back end for you.

    # New/Recent Articles

    Last Updated: 12/27/2023, 9:52:25 PM

    +

    1. The create method on Surface takes in any struct that implements the HasRawWindow trait, instead of a RawWindowHandle. This means that the raw-window-handle = "0.3" line in Cargo.toml is no longer needed.

    I don't know if this is a change from 0.4, but you use wgpu = "0.4" line in dependencies instead of the [dependencies.wgpu] as wgpu will determine the best back end for you.

    # New/Recent Articles

    Last Updated: 1/20/2024, 10:13:50 PM

    ←

    - + diff --git a/showcase/alignment/index.html b/showcase/alignment/index.html index 7d3cfd184..81c36e71d 100644 --- a/showcase/alignment/index.html +++ b/showcase/alignment/index.html @@ -8,7 +8,7 @@ - + @@ -37,7 +37,7 @@ | = note: source type: `LightUniform` (256 bits) = note: target type: `_::{closure#0}::TypeWithoutPadding` (192 bits) -

    # Additional resources

    If you're looking for more information check out the write-up (opens new window) by @teoxoy.

    Last Updated: 12/27/2023, 9:52:25 PM

    +

    # Additional resources

    If you're looking for more information check out the write-up (opens new window) by @teoxoy.

    Last Updated: 1/20/2024, 10:13:50 PM

    ← →

    - + diff --git a/showcase/compute/index.html b/showcase/compute/index.html index a01a11f7a..e570ec7ed 100644 --- a/showcase/compute/index.html +++ b/showcase/compute/index.html @@ -8,7 +8,7 @@ - + @@ -113,7 +113,7 @@ }); flat_triangle_map.extend(t_list); } -

    I ultimately decided against this method as it was more complicated, and I haven't had time to benchmark it to see if it's faster than the simple method.

    # Results

    The tangents and bitangents are now getting calculated correctly and on the GPU!

    ./results.png

    Check out the code! (opens new window)
    Last Updated: 12/27/2023, 9:52:25 PM

    +

    I ultimately decided against this method as it was more complicated, and I haven't had time to benchmark it to see if it's faster than the simple method.

    # Results

    The tangents and bitangents are now getting calculated correctly and on the GPU!

    ./results.png

    Check out the code! (opens new window)
    Last Updated: 1/20/2024, 10:13:50 PM

    ← →

    - + diff --git a/showcase/gifs/index.html b/showcase/gifs/index.html index 920e17fee..17fdae2fc 100644 --- a/showcase/gifs/index.html +++ b/showcase/gifs/index.html @@ -8,7 +8,7 @@ - + @@ -140,7 +140,7 @@ }

    Once that's done we can pass our frames into save_gif().

    save_gif("output.gif", &mut frames, 1, texture_size as u16).unwrap();
-

    That's the gist of it. We can improve things using a texture array, and sending the draw commands all at once, but this gets the idea across. With the shader I wrote we get the following GIF.

    ./output.gif

    Check out the code! (opens new window)
    Last Updated: 12/27/2023, 9:52:25 PM

    +

    That's the gist of it. We can improve things using a texture array, and sending the draw commands all at once, but this gets the idea across. With the shader I wrote we get the following GIF.

    ./output.gif

    Check out the code! (opens new window)
    Last Updated: 1/20/2024, 10:13:50 PM

    ← →

    - + diff --git a/showcase/imgui-demo/index.html b/showcase/imgui-demo/index.html index 3f811ff0b..ea285c568 100644 --- a/showcase/imgui-demo/index.html +++ b/showcase/imgui-demo/index.html @@ -8,7 +8,7 @@ - + @@ -106,7 +106,7 @@ drop(pass); display.queue.submit(Some(encoder.finish())); -

    That's all there is to it. Here's a picture of the results!

    ./screenshot.png

    Check out the code! (opens new window)
    Last Updated: 12/27/2023, 9:52:25 PM
    - +

    That's all there is to it. Here's a picture of the results!

    ./screenshot.png

    Check out the code! (opens new window)
    Last Updated: 1/20/2024, 10:13:50 PM
    + diff --git a/showcase/index.html b/showcase/index.html index d340b833d..75cea2301 100644 --- a/showcase/index.html +++ b/showcase/index.html @@ -8,11 +8,11 @@ - + -
    Learn Wgpu

    # Foreword

    The articles in this section are not meant to be tutorials. They are showcases of the various things you can do with wgpu. I won't go over the specifics of creating wgpu resources, as those will be covered elsewhere. The code for these examples is still available however and will be accessible on Github.

    Last Updated: 12/27/2023, 9:52:25 PM

    +

    Learn Wgpu

    # Foreword

    The articles in this section are not meant to be tutorials. They are showcases of the various things you can do with wgpu. I won't go over the specifics of creating wgpu resources, as those will be covered elsewhere. The code for these examples is still available however and will be accessible on Github.

    Last Updated: 1/20/2024, 10:13:50 PM

    ← →

    - + diff --git a/showcase/pong/index.html b/showcase/pong/index.html index c9cea0f33..737271e1a 100644 --- a/showcase/pong/index.html +++ b/showcase/pong/index.html @@ -8,7 +8,7 @@ - + @@ -282,7 +282,7 @@ }) .expect("Couldn't append canvas to document body."); } -

    Everything else works the same.

    # Summary

    A fun project to work on. It was overly architected, and kinda hard to make changes, but a good experience nonetheless.

    Try the code down below! (Controls currently require a keyboard.)

    Last Updated: 12/27/2023, 9:52:25 PM

    +

    Everything else works the same.

    # Summary

    A fun project to work on. It was overly architected, and kinda hard to make changes, but a good experience nonetheless.

    Try the code down below! (Controls currently require a keyboard.)

    Last Updated: 1/20/2024, 10:13:50 PM

    ← →

    - + diff --git a/showcase/threading/index.html b/showcase/threading/index.html index 8985fa85f..5b1068e0b 100644 --- a/showcase/threading/index.html +++ b/showcase/threading/index.html @@ -8,7 +8,7 @@ - + @@ -102,7 +102,7 @@ }

    We've parallelized loading the meshes, and making the vertex array for them. Probably a bit overkill, but rayon should prevent us from using too many threads.

    You'll notice that we didn't use rayon for calculating the tangent, and bitangent. I tried to get it to work, but I was having trouble finding a way to do it without multiple mutable references to vertices. I don't feel like introducing a std::sync::Mutex, so I'll leave it for now.

    This is honestly a better job for a compute shader, as the model data is going to get loaded into a buffer anyway.

    # It's that easy!

    Most of the wgpu types are Send + Sync, so we can use them in threads without much trouble. It was so easy, that I feel like this tutorial is too short! I'll just leave off with a speed comparison between the previous model loading code and the current code.

    Elapsed (Original): 309.596382ms
 Elapsed (Threaded): 199.645027ms
-

    We're not loading that many resources, so the speedup is minimal. We'll be doing more stuff with threading, but this is a good introduction.

    Check out the code! (opens new window)
    Last Updated: 12/27/2023, 9:52:25 PM
    - +

    We're not loading that many resources, so the speedup is minimal. We'll be doing more stuff with threading, but this is a good introduction.

    Check out the code! (opens new window)
    Last Updated: 1/20/2024, 10:13:50 PM
    + diff --git a/showcase/windowless/index.html b/showcase/windowless/index.html index e4dd918af..3b8706b18 100644 --- a/showcase/windowless/index.html +++ b/showcase/windowless/index.html @@ -8,7 +8,7 @@ - + @@ -229,7 +229,7 @@ fn main() { pollster::block_on(run()); } -

    With all that you should have an image like this.

    a brown triangle

    Check out the code! (opens new window)
    Last Updated: 12/27/2023, 9:52:25 PM

    +

    With all that you should have an image like this.

    a brown triangle

    Check out the code! (opens new window)
    Last Updated: 1/20/2024, 10:13:50 PM

    ← →

    - + diff --git a/todo.html b/todo.html index 1b0e2ad58..57f2c67c9 100644 --- a/todo.html +++ b/todo.html @@ -8,11 +8,11 @@ - + - - + + diff --git a/topics/index.html b/topics/index.html index 35b4a6f77..1cc666d65 100644 --- a/topics/index.html +++ b/topics/index.html @@ -8,12 +8,12 @@ - + - +who are looking for a specific thing!

    # Basics

    # Lighting

    # Misc

    Last Updated: 1/20/2024, 10:13:50 PM
    +