Basic Android / GLES support

Cargo.toml

@@ -17,7 +17,7 @@ name = "gfx_app"
 env_logger = "0.3"
 getopts = "0.2"
 time = "0.1"
-glutin = "0.5"
+glutin = "0.6"
 gfx_core = { path = "src/core", version = "0.3" }
 gfx_device_gl = { path = "src/backend/gl", version = "0.10" }
 gfx_window_glutin = { path = "src/window/glutin", version = "0.11" }

examples/cube/main.rs

@@ -26,8 +26,8 @@ use gfx::Bundle;
 // Notice the use of FixedPoint.
 gfx_defines!{
     vertex Vertex {
-        pos: [i8; 4] = "a_Pos",
-        tex_coord: [i8; 2] = "a_TexCoord",
+        pos: [f32; 4] = "a_Pos",
+        tex_coord: [f32; 2] = "a_TexCoord",
     }
 
     constant Locals {
@@ -49,8 +49,8 @@ gfx_defines!{
 impl Vertex {
     fn new(p: [i8; 3], t: [i8; 2]) -> Vertex {
         Vertex {
-            pos: [p[0], p[1], p[2], 1],
-            tex_coord: t,
+            pos: [p[0] as f32, p[1] as f32, p[2] as f32, 1.0],
+            tex_coord: [t[0] as f32, t[1] as f32],
         }
     }
 }
@@ -69,12 +69,14 @@ impl<R: gfx::Resources> gfx_app::Application<R> for App<R> {
         let vs = gfx_app::shade::Source {
             glsl_120: include_bytes!("shader/cube_120.glslv"),
             glsl_150: include_bytes!("shader/cube_150.glslv"),
+            glsl_es_100: include_bytes!("shader/cube_100_es.glslv"),
             hlsl_40:  include_bytes!("data/vertex.fx"),
             .. gfx_app::shade::Source::empty()
         };
         let ps = gfx_app::shade::Source {
             glsl_120: include_bytes!("shader/cube_120.glslf"),
             glsl_150: include_bytes!("shader/cube_150.glslf"),
+            glsl_es_100: include_bytes!("shader/cube_100_es.glslf"),
             hlsl_40:  include_bytes!("data/pixel.fx"),
             .. gfx_app::shade::Source::empty()
         };

examples/cube/shader/cube.hlsl

@@ -7,7 +7,7 @@ cbuffer Locals {
 	float4x4 u_Transform;
 };
 
-VsOutput Vertex(int4 pos: a_Pos, int2 tc: a_TexCoord) {
+VsOutput Vertex(float4 pos: a_Pos, float2 tc: a_TexCoord) {
     VsOutput output = {
     	mul(u_Transform, pos),
     	tc,

examples/cube/shader/cube_100_es.glslf

@@ -0,0 +1,13 @@
+#version 100
+
+precision mediump float;
+precision mediump int;
+
+varying vec2 v_TexCoord;
+uniform sampler2D t_Color;
+
+void main() {
+    vec4 tex = texture2D(t_Color, v_TexCoord);
+    float blend = dot(v_TexCoord-vec2(0.5,0.5), v_TexCoord-vec2(0.5,0.5));
+    gl_FragColor = mix(tex, vec4(0.0,0.0,0.0,0.0), blend*1.0);
+}

examples/cube/shader/cube_100_es.glslv

@@ -0,0 +1,12 @@
+#version 100
+
+attribute vec4 a_Pos;
+attribute vec2 a_TexCoord;
+varying vec2 v_TexCoord;
+
+uniform mat4 u_Transform;
+
+void main() {
+    v_TexCoord = a_TexCoord;
+    gl_Position = u_Transform * a_Pos;
+}

examples/cube/shader/cube_120.glslv

@@ -1,7 +1,7 @@
 #version 120
 
-attribute ivec4 a_Pos;
-attribute ivec2 a_TexCoord;
+attribute vec4 a_Pos;
+attribute vec2 a_TexCoord;
 varying vec2 v_TexCoord;
 
 uniform mat4 u_Transform;

examples/cube/shader/cube_150.glslv

@@ -1,7 +1,7 @@
 #version 150 core
 
-in ivec4 a_Pos;
-in ivec2 a_TexCoord;
+in vec4 a_Pos;
+in vec2 a_TexCoord;
 out vec2 v_TexCoord;
 
 uniform mat4 u_Transform;

examples/shadow/main.rs

@@ -604,7 +604,7 @@ impl<R, C> gfx_app::ApplicationBase<R, C> for App<R, C> where
 // Section-6: main entry point
 
 pub fn main() {
-    <App<_, _> as gfx_app::ApplicationGL2>::launch(
+    <App<_, _> as gfx_app::ApplicationGL>::launch(
         "Multi-threaded shadow rendering example with gfx-rs",
         gfx_app::DEFAULT_CONFIG);
 }

src/backend/gl/src/info.rs

@@ -21,6 +21,7 @@ use gfx_core::Capabilities;
 /// A version number for a specific component of an OpenGL implementation
 #[derive(Copy, Clone, Eq, Ord, PartialEq, PartialOrd)]
 pub struct Version {
+    pub is_embedded: bool,
     pub major: u32,
     pub minor: u32,
     pub revision: Option<u32>,
@@ -32,12 +33,23 @@ impl Version {
     pub fn new(major: u32, minor: u32, revision: Option<u32>,
                vendor_info: &'static str) -> Version {
         Version {
+            is_embedded: false,
             major: major,
             minor: minor,
             revision: revision,
             vendor_info: vendor_info,
         }
     }
+    /// Create a new OpenGL ES version number
+    pub fn new_embedded(major: u32, minor: u32, vendor_info: &'static str) -> Version {
+        Version {
+            is_embedded: true,
+            major: major,
+            minor: minor,
+            revision: None,
+            vendor_info: vendor_info,
+        }
+    }
 
     /// According to the OpenGL specification, the version information is
     /// expected to follow the following syntax:
@@ -54,9 +66,17 @@ impl Version {
     /// Note that this function is intentionally lenient in regards to parsing,
     /// and will try to recover at least the first two version numbers without
     /// resulting in an `Err`.
-    pub fn parse(src: &'static str) -> Result<Version, &'static str> {
+    pub fn parse(mut src: &'static str) -> Result<Version, &'static str> {
+        let es_sig = " ES ";
+        let is_es = match src.rfind(es_sig) {
+            Some(pos) => {
+                src = &src[pos + es_sig.len() ..];
+                true
+            },
+            None => false,
+        };
         let (version, vendor_info) = match src.find(' ') {
-            Some(i) => (&src[..i], &src[(i + 1)..]),
+            Some(i) => (&src[..i], &src[i+1..]),
             None => (src, ""),
         };
 
@@ -69,6 +89,7 @@ impl Version {
 
         match (major, minor, revision) {
             (Some(major), Some(minor), revision) => Ok(Version {
+                is_embedded: is_es,
                 major: major,
                 minor: minor,
                 revision: revision,
@@ -185,7 +206,11 @@ impl Info {
     }
 
     pub fn is_version_supported(&self, major: u32, minor: u32) -> bool {
-        self.version >= Version::new(major, minor, None, "")
+        !self.version.is_embedded && self.version >= Version::new(major, minor, None, "")
+    }
+
+    pub fn is_embedded_version_supported(&self, major: u32, minor: u32) -> bool {
+        self.version.is_embedded && self.version >= Version::new(major, minor, None, "")
     }
 
     /// Returns `true` if the implementation supports the extension
@@ -218,7 +243,8 @@ pub fn get(gl: &gl::Gl) -> (Info, Capabilities, PrivateCaps) {
     };
     let private = PrivateCaps {
         array_buffer_supported:            info.is_version_or_extension_supported(3, 0, "GL_ARB_vertex_array_object"),
-        frame_buffer_supported:            info.is_version_or_extension_supported(3, 0, "GL_ARB_framebuffer_object"),
+        frame_buffer_supported:            info.is_version_or_extension_supported(3, 0, "GL_ARB_framebuffer_object") |
+                                           info.is_embedded_version_supported(2, 0),
         immutable_storage_supported:       info.is_version_or_extension_supported(4, 2, "GL_ARB_texture_storage"),
         sampler_objects_supported:         info.is_version_or_extension_supported(3, 3, "GL_ARB_sampler_objects"),
         program_interface_supported:       info.is_version_or_extension_supported(4, 3, "GL_ARB_program_interface_query"),
@@ -243,5 +269,8 @@ mod tests {
         assert_eq!(Version::parse("1.2. h3l1o. W0rld"), Ok(Version::new(1, 2, None, "h3l1o. W0rld")));
         assert_eq!(Version::parse("1.2.3.h3l1o. W0rld"), Ok(Version::new(1, 2, Some(3), "W0rld")));
         assert_eq!(Version::parse("1.2.3 h3l1o. W0rld"), Ok(Version::new(1, 2, Some(3), "h3l1o. W0rld")));
+        assert_eq!(Version::parse("OpenGL ES 3.1"), Ok(Version::new_embedded(3, 1, "")));
+        assert_eq!(Version::parse("OpenGL ES 2.0 Google Nexus"), Ok(Version::new_embedded(2, 0, "Google Nexus")));
+        assert_eq!(Version::parse("GLSL ES 1.1"), Ok(Version::new_embedded(1, 1, "")));
     }
 }

src/backend/gl/src/lib.rs

@@ -436,7 +436,7 @@ impl Device {
                     assert!(d::MAX_SAMPLERS <= d::MAX_RESOURCE_VIEWS);
                     debug_assert_eq!(sampler.object, 0);
                     if let Some(bind) = bind_opt {
-                        tex::bind_sampler(gl, bind, &sampler.info);
+                        tex::bind_sampler(gl, bind, &sampler.info, self.info.version.is_embedded);
                     }else {
                         error!("Trying to bind a sampler to slot {}, when sampler objects are not supported, and no texture is bound there", slot);
                     }
@@ -480,7 +480,7 @@ impl Device {
                 state::bind_draw_color_buffers(&self.share.context, mask);
             },
             Command::SetRasterizer(rast) => {
-                state::bind_rasterizer(&self.share.context, &rast);
+                state::bind_rasterizer(&self.share.context, &rast, self.info.version.is_embedded);
             },
             Command::SetViewport(rect) => {
                 state::bind_viewport(&self.share.context, rect);

src/backend/gl/src/state.rs

@@ -44,7 +44,7 @@ pub fn bind_raster_method(gl: &gl::Gl, method: s::RasterMethod, offset: Option<s
     }
 }
 
-pub fn bind_rasterizer(gl: &gl::Gl, r: &s::Rasterizer) {
+pub fn bind_rasterizer(gl: &gl::Gl, r: &s::Rasterizer, is_embedded: bool) {
     unsafe {
         gl.FrontFace(match r.front_face {
             FrontFace::Clockwise => gl::CW,
@@ -63,8 +63,10 @@ pub fn bind_rasterizer(gl: &gl::Gl, r: &s::Rasterizer) {
             gl.CullFace(gl::BACK);
         }}
     }
-
-    bind_raster_method(gl, r.method, r.offset);
+
+    if !is_embedded {
+        bind_raster_method(gl, r.method, r.offset);
+    }
     match r.samples {
         Some(_) => unsafe { gl.Enable(gl::MULTISAMPLE) },
         None => unsafe { gl.Disable(gl::MULTISAMPLE) },

src/backend/gl/src/tex.rs

@@ -534,7 +534,7 @@ pub fn make_with_storage(gl: &gl::Gl, desc: &t::Descriptor, cty: ChannelType) ->
 
 /// Bind a sampler using a given binding anchor.
 /// Used for GL compatibility profile only. The core profile has sampler objects
-pub fn bind_sampler(gl: &gl::Gl, target: GLenum, info: &t::SamplerInfo) { unsafe {
+pub fn bind_sampler(gl: &gl::Gl, target: GLenum, info: &t::SamplerInfo, is_embedded: bool) { unsafe {
     let (min, mag) = filter_to_gl(info.filter);
 
     match info.filter {
@@ -551,9 +551,11 @@ pub fn bind_sampler(gl: &gl::Gl, target: GLenum, info: &t::SamplerInfo) { unsafe
     gl.TexParameteri(target, gl::TEXTURE_WRAP_T, wrap_to_gl(t) as GLint);
     gl.TexParameteri(target, gl::TEXTURE_WRAP_R, wrap_to_gl(r) as GLint);
 
-    gl.TexParameterf(target, gl::TEXTURE_LOD_BIAS, info.lod_bias.into());
-    let border: [f32; 4] = info.border.into();
-    gl.TexParameterfv(target, gl::TEXTURE_BORDER_COLOR, &border[0]);
+    if !is_embedded {
+        let border: [f32; 4] = info.border.into();
+        gl.TexParameterfv(target, gl::TEXTURE_BORDER_COLOR, &border[0]);
+        gl.TexParameterf(target, gl::TEXTURE_LOD_BIAS, info.lod_bias.into());
+    }
 
     let (min, max) = info.lod_range;
     gl.TexParameterf(target, gl::TEXTURE_MIN_LOD, min.into());

src/lib.rs

@@ -96,7 +96,7 @@ pub trait Application<R: gfx::Resources>: Sized {
         WrapD3D11::<Self>::launch(name, DEFAULT_CONFIG);
     }
     #[cfg(not(target_os = "windows"))]
-    fn launch_default(name: &str) where WrapGL2<Self>: ApplicationGL2 {
+    fn launch_default(name: &str) where WrapGL2<Self>: ApplicationGL {
         WrapGL2::<Self>::launch(name, DEFAULT_CONFIG);
     }
 }
@@ -137,7 +137,7 @@ impl<R, C, A> ApplicationBase<R, C> for Wrap<R, C, A> where
 }
 
 
-pub trait ApplicationGL2 {
+pub trait ApplicationGL {
     fn launch(&str, Config);
 }
 
@@ -146,25 +146,35 @@ pub trait ApplicationD3D11 {
     fn launch(&str, Config);
 }
 
-impl<A> ApplicationGL2 for A where
+impl<A> ApplicationGL for A where
     A: ApplicationBase<gfx_device_gl::Resources,
                        gfx_device_gl::CommandBuffer>
 {
     fn launch(title: &str, config: Config) {
         use gfx::traits::Device;
 
         env_logger::init().unwrap();
+        let gl_version = glutin::GlRequest::GlThenGles {
+            opengl_version: (3, 2), //TODO: try more versions
+            opengles_version: (2, 0),
+        };
         let builder = glutin::WindowBuilder::new()
             .with_title(title.to_string())
             .with_dimensions(config.size.0 as u32, config.size.1 as u32)
+            .with_gl(gl_version)
             .with_vsync();
         let (window, mut device, mut factory, main_color, main_depth) =
             gfx_window_glutin::init::<ColorFormat, DepthFormat>(builder);
         let (width, height) = window.get_inner_size().unwrap();
         let combuf = factory.create_command_buffer();
+        let shade_lang = device.get_info().shading_language;
 
         let mut app = Self::new(factory, combuf.into(), Init {
-            backend: shade::Backend::Glsl(device.get_info().shading_language),
+            backend: if shade_lang.is_embedded {
+                shade::Backend::GlslEs(shade_lang)
+            } else {
+                shade::Backend::Glsl(shade_lang)
+            },
             color: main_color,
             depth: main_depth,
             aspect_ratio: width as f32 / height as f32,

src/shade.rs

@@ -21,6 +21,7 @@ pub use gfx_device_dx11::ShaderModel as DxShaderModel;
 #[derive(Copy, Clone, PartialEq, Debug)]
 pub enum Backend {
     Glsl(GlslVersion),
+    GlslEs(GlslVersion),
     #[cfg(target_os = "windows")]
     Hlsl(DxShaderModel),
 }
@@ -35,6 +36,9 @@ pub struct Source<'a> {
     pub glsl_140: &'a [u8],
     pub glsl_150: &'a [u8],
     pub glsl_430: &'a [u8],
+    pub glsl_es_100: &'a [u8],
+    pub glsl_es_200: &'a [u8],
+    pub glsl_es_300: &'a [u8],
     pub hlsl_30 : &'a [u8],
     pub hlsl_40 : &'a [u8],
     pub hlsl_41 : &'a [u8],
@@ -51,6 +55,9 @@ impl<'a> Source<'a> {
             glsl_140: EMPTY,
             glsl_150: EMPTY,
             glsl_430: EMPTY,
+            glsl_es_100: EMPTY,
+            glsl_es_200: EMPTY,
+            glsl_es_300: EMPTY,
             hlsl_30:  EMPTY,
             hlsl_40:  EMPTY,
             hlsl_41:  EMPTY,
@@ -72,6 +79,15 @@ impl<'a> Source<'a> {
                     _ => return Err(())
                 }
             },
+            Backend::GlslEs(version) => {
+                let v = version.major * 100 + version.minor;
+                match *self {
+                    Source { glsl_es_100: s, .. } if s != EMPTY && v >= 100 => s,
+                    Source { glsl_es_200: s, .. } if s != EMPTY && v >= 200 => s,
+                    Source { glsl_es_300: s, .. } if s != EMPTY && v >= 300 => s,
+                    _ => return Err(())
+                }
+            },
             #[cfg(target_os = "windows")]
             Backend::Hlsl(model) => match *self {
                 Source { hlsl_50: s, .. } if s != EMPTY && model >= 50 => s,

src/window/glutin/Cargo.toml

@@ -26,6 +26,6 @@ authors = ["The Gfx-rs Developers"]
 name = "gfx_window_glutin"
 
 [dependencies]
-glutin = "0.5"
+glutin = "0.6"
 gfx_core = { path = "../../core", version = "0.3" }
 gfx_device_gl = { path = "../../backend/gl", version = "0.10" }