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objects\n if position.z >= opaqueDepth {\n discard;\n }\n\n // The index in the heads buffer corresponding to the head data for the fragment at\n // the current location.\n let headsIndex = u32(fragCoords.y - sliceInfo.sliceStartY) * uniforms.targetWidth + u32(fragCoords.x);\n\n // The index in the linkedList buffer at which to store the new fragment\n let fragIndex = atomicAdd(&heads.numFragments, 1u);\n\n // If we run out of space to store the fragments, we just lose them\n if fragIndex < uniforms.maxStorableFragments {\n let lastHead = atomicExchange(&heads.data[headsIndex], fragIndex);\n linkedList.data[fragIndex].depth = position.z;\n linkedList.data[fragIndex].next = lastHead;\n linkedList.data[fragIndex].color = vec4(colors[(instance + 3u) % 6u], 0.3);\n }\n}",c="struct Uniforms {\n modelViewProjectionMatrix: mat4x4,\n maxStorableFragments: u32,\n targetWidth: u32,\n};\n\nstruct SliceInfo {\n sliceStartY: i32\n};\n\nstruct Heads {\n numFragments: u32,\n data: array\n};\n\nstruct LinkedListElement {\n color: vec4,\n depth: f32,\n next: u32\n};\n\nstruct LinkedList {\n data: array\n};\n\n@binding(0) @group(0) var uniforms: Uniforms;\n@binding(1) @group(0) var heads: Heads;\n@binding(2) @group(0) var linkedList: LinkedList;\n@binding(3) @group(0) var sliceInfo: SliceInfo;\n\n// Output a full screen quad\n@vertex\nfn main_vs(@builtin(vertex_index) vertIndex: u32) -> @builtin(position) vec4 {\n const position = array, 6>(\n vec2(-1.0, -1.0),\n vec2(1.0, -1.0),\n vec2(1.0, 1.0),\n vec2(-1.0, -1.0),\n vec2(1.0, 1.0),\n vec2(-1.0, 1.0),\n );\n \n return vec4(position[vertIndex], 0.0, 1.0);\n}\n\n@fragment\nfn main_fs(@builtin(position) position: vec4) -> @location(0) vec4 {\n let fragCoords = vec2(position.xy);\n let headsIndex = u32(fragCoords.y - sliceInfo.sliceStartY) * uniforms.targetWidth + u32(fragCoords.x);\n\n // The maximum layers we can process for any pixel\n const maxLayers = 24u;\n\n var layers: array;\n\n var numLayers = 0u;\n var elementIndex = heads.data[headsIndex];\n\n // copy the list elements into an array up to the maximum amount of layers\n while elementIndex != 0xFFFFFFFFu && numLayers < maxLayers {\n layers[numLayers] = linkedList.data[elementIndex];\n numLayers++;\n elementIndex = linkedList.data[elementIndex].next;\n }\n\n if numLayers == 0u {\n discard;\n }\n \n // sort the fragments by depth\n for (var i = 1u; i < numLayers; i++) {\n let toInsert = layers[i];\n var j = i;\n\n while j > 0u && toInsert.depth > layers[j - 1u].depth {\n layers[j] = layers[j - 1u];\n j--;\n }\n\n layers[j] = toInsert;\n }\n\n // pre-multiply alpha for the first layer\n var color = vec4(layers[0].color.a * layers[0].color.rgb, layers[0].color.a);\n\n // blend the remaining layers\n for (var i = 1u; i < numLayers; i++) {\n let mixed = mix(color.rgb, layers[i].color.rgb, layers[i].color.aaa);\n color = vec4(mixed, color.a);\n }\n\n return color;\n}",f="src/sample/a-buffer/main.ts";let d=async e=>{let{canvas:n,pageState:t,gui:r}=e,a=await navigator.gpu.requestAdapter(),o=await a.requestDevice();if(!t.active)return;let f=n.getContext("webgpu"),d=navigator.gpu.getPreferredCanvasFormat();f.configure({device:o,format:d,alphaMode:"premultiplied"});let m=new URLSearchParams(window.location.search),p={memoryStrategy:m.get("memoryStrategy")||"multipass"},g=o.createBuffer({size:3*s.positions.length*Float32Array.BYTES_PER_ELEMENT,usage:GPUBufferUsage.VERTEX,mappedAtCreation:!0,label:"vertexBuffer"});{let h=new Float32Array(g.getMappedRange());for(let b=0;b{let e=window.devicePixelRatio;"clamp-pixel-ratio"===p.memoryStrategy&&(e=Math.min(window.devicePixelRatio,3)),n.width=n.clientWidth*e,n.height=n.clientHeight*e;let t=o.createTexture({size:[n.width,n.height],format:"depth24plus",usage:GPUTextureUsage.RENDER_ATTACHMENT|GPUTextureUsage.TEXTURE_BINDING,label:"depthTexture"}),r=t.createView({label:"depthTextureView"}),a=5*Float32Array.BYTES_PER_ELEMENT+1*Uint32Array.BYTES_PER_ELEMENT,l=4*n.width*a,u=Math.floor(o.limits.maxStorageBufferBindingSize/l),c=Math.ceil(n.height/u),d=Math.ceil(n.height/c),m=o.createBuffer({size:d*l,usage:GPUBufferUsage.STORAGE|GPUBufferUsage.COPY_DST,label:"linkedListBuffer"}),h=o.createBuffer({size:c*o.limits.minUniformBufferOffsetAlignment,usage:GPUBufferUsage.UNIFORM,mappedAtCreation:!0,label:"sliceInfoBuffer"});{let b=new Int32Array(h.getMappedRange()),v=o.limits.minUniformBufferOffsetAlignment/Int32Array.BYTES_PER_ELEMENT;for(let E=0;E{C=z()};r.add(p,"memoryStrategy",["multipass","clamp-pixel-ratio"]).onFinishChange(N),requestAnimationFrame(function e(){t.active&&(C(),requestAnimationFrame(e))})},m=()=>(0,r.Tl)({name:"A-Buffer",description:"Demonstrates order independent transparency using a per-pixel \n linked-list of translucent fragments. Provides a choice for \n limiting memory usage (when required).",gui:!0,init:d,sources:[{name:f.substring(20),contents:"import { mat4, vec3 } from 'wgpu-matrix';\nimport { makeSample, SampleInit } from '../../components/SampleLayout';\n\nimport { mesh } from '../../meshes/teapot';\n\nimport opaqueWGSL from './opaque.wgsl';\nimport translucentWGSL from './translucent.wgsl';\nimport compositeWGSL from './composite.wgsl';\n\nfunction roundUp(n: number, k: number): number {\n return Math.ceil(n / k) * k;\n}\n\nconst init: SampleInit = async ({ canvas, pageState, gui }) => {\n const adapter = await navigator.gpu.requestAdapter();\n const device = await adapter.requestDevice();\n\n if (!pageState.active) return;\n\n const context = canvas.getContext('webgpu') as GPUCanvasContext;\n const presentationFormat = navigator.gpu.getPreferredCanvasFormat();\n\n context.configure({\n device,\n format: presentationFormat,\n alphaMode: 'premultiplied',\n });\n\n const params = new URLSearchParams(window.location.search);\n\n const settings = {\n memoryStrategy: params.get('memoryStrategy') || 'multipass',\n };\n\n // Create the model vertex buffer\n const vertexBuffer = device.createBuffer({\n size: 3 * mesh.positions.length * Float32Array.BYTES_PER_ELEMENT,\n usage: GPUBufferUsage.VERTEX,\n mappedAtCreation: true,\n label: 'vertexBuffer',\n });\n {\n const mapping = new Float32Array(vertexBuffer.getMappedRange());\n for (let i = 0; i < mesh.positions.length; ++i) {\n mapping.set(mesh.positions[i], 3 * i);\n }\n vertexBuffer.unmap();\n }\n\n // Create the model index buffer\n const indexCount = mesh.triangles.length * 3;\n const indexBuffer = device.createBuffer({\n size: indexCount * Uint16Array.BYTES_PER_ELEMENT,\n usage: GPUBufferUsage.INDEX,\n mappedAtCreation: true,\n label: 'indexBuffer',\n });\n {\n const mapping = new Uint16Array(indexBuffer.getMappedRange());\n for (let i = 0; i < mesh.triangles.length; ++i) {\n mapping.set(mesh.triangles[i], 3 * i);\n }\n indexBuffer.unmap();\n }\n\n // Uniforms contains:\n // * modelViewProjectionMatrix: mat4x4\n // * maxStorableFragments: u32\n // * targetWidth: u32\n const uniformsSize = roundUp(\n 16 * Float32Array.BYTES_PER_ELEMENT + 2 * Uint32Array.BYTES_PER_ELEMENT,\n 16\n );\n\n const uniformBuffer = device.createBuffer({\n size: uniformsSize,\n usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST,\n label: 'uniformBuffer',\n });\n\n const opaqueModule = device.createShaderModule({\n code: opaqueWGSL,\n label: 'opaqueModule',\n });\n\n const opaquePipeline = device.createRenderPipeline({\n layout: 'auto',\n vertex: {\n module: opaqueModule,\n entryPoint: 'main_vs',\n buffers: [\n {\n arrayStride: 3 * Float32Array.BYTES_PER_ELEMENT,\n attributes: [\n {\n // position\n format: 'float32x3',\n offset: 0,\n shaderLocation: 0,\n },\n ],\n },\n ],\n },\n fragment: {\n module: opaqueModule,\n entryPoint: 'main_fs',\n targets: [\n {\n format: presentationFormat,\n },\n ],\n },\n primitive: {\n topology: 'triangle-list',\n },\n depthStencil: {\n depthWriteEnabled: true,\n depthCompare: 'less',\n format: 'depth24plus',\n },\n label: 'opaquePipeline',\n });\n\n const opaquePassDescriptor: GPURenderPassDescriptor = {\n colorAttachments: [\n {\n view: undefined,\n clearValue: { r: 0, g: 0, b: 0, a: 1.0 },\n loadOp: 'clear',\n storeOp: 'store',\n },\n ],\n depthStencilAttachment: {\n view: undefined,\n depthClearValue: 1.0,\n depthLoadOp: 'clear',\n depthStoreOp: 'store',\n },\n label: 'opaquePassDescriptor',\n };\n\n const opaqueBindGroup = device.createBindGroup({\n layout: opaquePipeline.getBindGroupLayout(0),\n entries: [\n {\n binding: 0,\n resource: {\n buffer: uniformBuffer,\n size: 16 * Float32Array.BYTES_PER_ELEMENT,\n label: 'modelViewProjection',\n },\n },\n ],\n label: 'opaquePipeline',\n });\n\n const translucentModule = device.createShaderModule({\n code: translucentWGSL,\n label: 'translucentModule',\n });\n\n const translucentBindGroupLayout = device.createBindGroupLayout({\n label: 'translucentBindGroupLayout',\n entries: [\n {\n binding: 0,\n visibility: GPUShaderStage.VERTEX | GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'uniform',\n },\n },\n {\n binding: 1,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'storage',\n },\n },\n {\n binding: 2,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'storage',\n },\n },\n {\n binding: 3,\n visibility: GPUShaderStage.FRAGMENT,\n texture: { sampleType: 'depth' },\n },\n {\n binding: 4,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'uniform',\n hasDynamicOffset: true,\n },\n },\n ],\n });\n\n const translucentPipeline = device.createRenderPipeline({\n layout: device.createPipelineLayout({\n bindGroupLayouts: [translucentBindGroupLayout],\n label: 'translucentPipelineLayout',\n }),\n vertex: {\n module: translucentModule,\n entryPoint: 'main_vs',\n buffers: [\n {\n arrayStride: 3 * Float32Array.BYTES_PER_ELEMENT,\n attributes: [\n {\n format: 'float32x3',\n offset: 0,\n shaderLocation: 0,\n },\n ],\n },\n ],\n },\n fragment: {\n module: translucentModule,\n entryPoint: 'main_fs',\n targets: [\n {\n format: presentationFormat,\n writeMask: 0x0,\n },\n ],\n },\n primitive: {\n topology: 'triangle-list',\n },\n label: 'translucentPipeline',\n });\n\n const translucentPassDescriptor: GPURenderPassDescriptor = {\n colorAttachments: [\n {\n loadOp: 'load',\n storeOp: 'store',\n view: undefined,\n },\n ],\n label: 'translucentPassDescriptor',\n };\n\n const compositeModule = device.createShaderModule({\n code: compositeWGSL,\n label: 'compositeModule',\n });\n\n const compositeBindGroupLayout = device.createBindGroupLayout({\n label: 'compositeBindGroupLayout',\n entries: [\n {\n binding: 0,\n visibility: GPUShaderStage.VERTEX | GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'uniform',\n },\n },\n {\n binding: 1,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'storage',\n },\n },\n {\n binding: 2,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'storage',\n },\n },\n {\n binding: 3,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'uniform',\n hasDynamicOffset: true,\n },\n },\n ],\n });\n\n const compositePipeline = device.createRenderPipeline({\n layout: device.createPipelineLayout({\n bindGroupLayouts: [compositeBindGroupLayout],\n label: 'compositePipelineLayout',\n }),\n vertex: {\n module: compositeModule,\n entryPoint: 'main_vs',\n },\n fragment: {\n module: compositeModule,\n entryPoint: 'main_fs',\n targets: [\n {\n format: presentationFormat,\n blend: {\n color: {\n srcFactor: 'one',\n operation: 'add',\n dstFactor: 'one-minus-src-alpha',\n },\n alpha: {},\n },\n },\n ],\n },\n primitive: {\n topology: 'triangle-list',\n },\n label: 'compositePipeline',\n });\n\n const compositePassDescriptor: GPURenderPassDescriptor = {\n colorAttachments: [\n {\n view: undefined,\n loadOp: 'load',\n storeOp: 'store',\n },\n ],\n label: 'compositePassDescriptor',\n };\n\n const configure = () => {\n let devicePixelRatio = window.devicePixelRatio;\n\n // The default maximum storage buffer binding size is 128Mib. The amount\n // of memory we need to store transparent fragments depends on the size\n // of the canvas and the average number of layers per fragment we want to\n // support. When the devicePixelRatio is 1, we know that 128Mib is enough\n // to store 4 layers per pixel at 600x600. However, when the device pixel\n // ratio is high enough we will exceed this limit.\n //\n // We provide 2 choices of mitigations to this issue:\n // 1) Clamp the device pixel ratio to a value which we know will not break\n // the limit. The tradeoff here is that the canvas resolution will not\n // match the native resolution and therefore may have a reduction in\n // quality.\n // 2) Break the frame into a series of horizontal slices using the scissor\n // functionality and process a single slice at a time. This limits memory\n // usage because we only need enough memory to process the dimensions\n // of the slice. The tradeoff is the performance reduction due to multiple\n // passes.\n if (settings.memoryStrategy === 'clamp-pixel-ratio') {\n devicePixelRatio = Math.min(window.devicePixelRatio, 3);\n }\n\n canvas.width = canvas.clientWidth * devicePixelRatio;\n canvas.height = canvas.clientHeight * devicePixelRatio;\n\n const depthTexture = device.createTexture({\n size: [canvas.width, canvas.height],\n format: 'depth24plus',\n usage:\n GPUTextureUsage.RENDER_ATTACHMENT | GPUTextureUsage.TEXTURE_BINDING,\n label: 'depthTexture',\n });\n\n const depthTextureView = depthTexture.createView({\n label: 'depthTextureView',\n });\n\n // Determines how much memory is allocated to store linked-list elements\n const averageLayersPerFragment = 4;\n\n // Each element stores\n // * color : vec4\n // * depth : f32\n // * index of next element in the list : u32\n const linkedListElementSize =\n 5 * Float32Array.BYTES_PER_ELEMENT + 1 * Uint32Array.BYTES_PER_ELEMENT;\n\n // We want to keep the linked-list buffer size under the maxStorageBufferBindingSize.\n // Split the frame into enough slices to meet that constraint.\n const bytesPerline =\n canvas.width * averageLayersPerFragment * linkedListElementSize;\n const maxLinesSupported = Math.floor(\n device.limits.maxStorageBufferBindingSize / bytesPerline\n );\n const numSlices = Math.ceil(canvas.height / maxLinesSupported);\n const sliceHeight = Math.ceil(canvas.height / numSlices);\n const linkedListBufferSize = sliceHeight * bytesPerline;\n\n const linkedListBuffer = device.createBuffer({\n size: linkedListBufferSize,\n usage: GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_DST,\n label: 'linkedListBuffer',\n });\n\n // To slice up the frame we need to pass the starting fragment y position of the slice.\n // We do this using a uniform buffer with a dynamic offset.\n const sliceInfoBuffer = device.createBuffer({\n size: numSlices * device.limits.minUniformBufferOffsetAlignment,\n usage: GPUBufferUsage.UNIFORM,\n mappedAtCreation: true,\n label: 'sliceInfoBuffer',\n });\n {\n const mapping = new Int32Array(sliceInfoBuffer.getMappedRange());\n\n // This assumes minUniformBufferOffsetAlignment is a multiple of 4\n const stride =\n device.limits.minUniformBufferOffsetAlignment /\n Int32Array.BYTES_PER_ELEMENT;\n for (let i = 0; i < numSlices; ++i) {\n mapping[i * stride] = i * sliceHeight;\n }\n sliceInfoBuffer.unmap();\n }\n\n // `Heads` struct contains the start index of the linked-list of translucent fragments\n // for a given pixel.\n // * numFragments : u32\n // * data : array\n const headsBuffer = device.createBuffer({\n size: (1 + canvas.width * sliceHeight) * Uint32Array.BYTES_PER_ELEMENT,\n usage: GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_DST,\n label: 'headsBuffer',\n });\n\n const headsInitBuffer = device.createBuffer({\n size: (1 + canvas.width * sliceHeight) * Uint32Array.BYTES_PER_ELEMENT,\n usage: GPUBufferUsage.COPY_SRC,\n mappedAtCreation: true,\n label: 'headsInitBuffer',\n });\n {\n const buffer = new Uint32Array(headsInitBuffer.getMappedRange());\n\n for (let i = 0; i < buffer.length; ++i) {\n buffer[i] = 0xffffffff;\n }\n\n headsInitBuffer.unmap();\n }\n\n const translucentBindGroup = device.createBindGroup({\n layout: translucentBindGroupLayout,\n entries: [\n {\n binding: 0,\n resource: {\n buffer: uniformBuffer,\n label: 'uniforms',\n },\n },\n {\n binding: 1,\n resource: {\n buffer: headsBuffer,\n label: 'headsBuffer',\n },\n },\n {\n binding: 2,\n resource: {\n buffer: linkedListBuffer,\n label: 'linkedListBuffer',\n },\n },\n {\n binding: 3,\n resource: depthTextureView,\n },\n {\n binding: 4,\n resource: {\n buffer: sliceInfoBuffer,\n size: device.limits.minUniformBufferOffsetAlignment,\n label: 'sliceInfoBuffer',\n },\n },\n ],\n label: 'translucentBindGroup',\n });\n\n const compositeBindGroup = device.createBindGroup({\n layout: compositePipeline.getBindGroupLayout(0),\n entries: [\n {\n binding: 0,\n resource: {\n buffer: uniformBuffer,\n label: 'uniforms',\n },\n },\n {\n binding: 1,\n resource: {\n buffer: headsBuffer,\n label: 'headsBuffer',\n },\n },\n {\n binding: 2,\n resource: {\n buffer: linkedListBuffer,\n label: 'linkedListBuffer',\n },\n },\n {\n binding: 3,\n resource: {\n buffer: sliceInfoBuffer,\n size: device.limits.minUniformBufferOffsetAlignment,\n label: 'sliceInfoBuffer',\n },\n },\n ],\n });\n\n opaquePassDescriptor.depthStencilAttachment.view = depthTextureView;\n\n // Rotates the camera around the origin based on time.\n function getCameraViewProjMatrix() {\n const aspect = canvas.width / canvas.height;\n\n const projectionMatrix = mat4.perspective(\n (2 * Math.PI) / 5,\n aspect,\n 1,\n 2000.0\n );\n\n const upVector = vec3.fromValues(0, 1, 0);\n const origin = vec3.fromValues(0, 0, 0);\n const eyePosition = vec3.fromValues(0, 5, -100);\n\n const rad = Math.PI * (Date.now() / 5000);\n const rotation = mat4.rotateY(mat4.translation(origin), rad);\n vec3.transformMat4(eyePosition, rotation, eyePosition);\n\n const viewMatrix = mat4.lookAt(eyePosition, origin, upVector);\n\n const viewProjMatrix = mat4.multiply(projectionMatrix, viewMatrix);\n return viewProjMatrix as Float32Array;\n }\n\n return function doDraw() {\n // update the uniform buffer\n {\n const buffer = new ArrayBuffer(uniformBuffer.size);\n\n new Float32Array(buffer).set(getCameraViewProjMatrix());\n new Uint32Array(buffer, 16 * Float32Array.BYTES_PER_ELEMENT).set([\n averageLayersPerFragment * canvas.width * sliceHeight,\n canvas.width,\n ]);\n\n device.queue.writeBuffer(uniformBuffer, 0, buffer);\n }\n\n const commandEncoder = device.createCommandEncoder();\n const textureView = context.getCurrentTexture().createView();\n\n // Draw the opaque objects\n opaquePassDescriptor.colorAttachments[0].view = textureView;\n const opaquePassEncoder =\n commandEncoder.beginRenderPass(opaquePassDescriptor);\n opaquePassEncoder.setPipeline(opaquePipeline);\n opaquePassEncoder.setBindGroup(0, opaqueBindGroup);\n opaquePassEncoder.setVertexBuffer(0, vertexBuffer);\n opaquePassEncoder.setIndexBuffer(indexBuffer, 'uint16');\n opaquePassEncoder.drawIndexed(mesh.triangles.length * 3, 8);\n opaquePassEncoder.end();\n\n for (let slice = 0; slice < numSlices; ++slice) {\n // initialize the heads buffer\n commandEncoder.copyBufferToBuffer(\n headsInitBuffer,\n 0,\n headsBuffer,\n 0,\n headsInitBuffer.size\n );\n\n const scissorX = 0;\n const scissorY = slice * sliceHeight;\n const scissorWidth = canvas.width;\n const scissorHeight =\n Math.min((slice + 1) * sliceHeight, canvas.height) -\n slice * sliceHeight;\n\n // Draw the translucent objects\n translucentPassDescriptor.colorAttachments[0].view = textureView;\n const translucentPassEncoder = commandEncoder.beginRenderPass(\n translucentPassDescriptor\n );\n\n // Set the scissor to only process a horizontal slice of the frame\n translucentPassEncoder.setScissorRect(\n scissorX,\n scissorY,\n scissorWidth,\n scissorHeight\n );\n\n translucentPassEncoder.setPipeline(translucentPipeline);\n translucentPassEncoder.setBindGroup(0, translucentBindGroup, [\n slice * device.limits.minUniformBufferOffsetAlignment,\n ]);\n translucentPassEncoder.setVertexBuffer(0, vertexBuffer);\n translucentPassEncoder.setIndexBuffer(indexBuffer, 'uint16');\n translucentPassEncoder.drawIndexed(mesh.triangles.length * 3, 8);\n translucentPassEncoder.end();\n\n // Composite the opaque and translucent objects\n compositePassDescriptor.colorAttachments[0].view = textureView;\n const compositePassEncoder = commandEncoder.beginRenderPass(\n compositePassDescriptor\n );\n\n // Set the scissor to only process a horizontal slice of the frame\n compositePassEncoder.setScissorRect(\n scissorX,\n scissorY,\n scissorWidth,\n scissorHeight\n );\n\n compositePassEncoder.setPipeline(compositePipeline);\n compositePassEncoder.setBindGroup(0, compositeBindGroup, [\n slice * device.limits.minUniformBufferOffsetAlignment,\n ]);\n compositePassEncoder.draw(6);\n compositePassEncoder.end();\n }\n\n device.queue.submit([commandEncoder.finish()]);\n };\n };\n\n let doDraw = configure();\n\n const updateSettings = () => {\n doDraw = configure();\n };\n\n gui\n .add(settings, 'memoryStrategy', ['multipass', 'clamp-pixel-ratio'])\n .onFinishChange(updateSettings);\n\n function frame() {\n // Sample is no longer the active page.\n if (!pageState.active) return;\n\n doDraw();\n\n requestAnimationFrame(frame);\n }\n\n requestAnimationFrame(frame);\n};\n\nconst ABuffer: () => JSX.Element = () =>\n makeSample({\n name: 'A-Buffer',\n description: `Demonstrates order independent transparency using a per-pixel \n linked-list of translucent fragments. Provides a choice for \n limiting memory usage (when required).`,\n gui: true,\n init,\n sources: [\n {\n name: __filename.substring(__dirname.length + 1),\n contents: __SOURCE__,\n },\n {\n name: 'opaque.wsgl',\n contents: opaqueWGSL,\n },\n {\n name: 'translucent.wsgl',\n contents: translucentWGSL,\n },\n {\n name: 'composite.wsgl',\n contents: compositeWGSL,\n },\n ],\n filename: __filename,\n });\n\nexport default ABuffer;\n"},{name:"opaque.wsgl",contents:l},{name:"translucent.wsgl",contents:u},{name:"composite.wsgl",contents:c}],filename:f});var 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Uniforms;\n\nstruct VertexOutput {\n @builtin(position) position: vec4,\n @location(0) @interpolate(flat) instance: u32\n};\n\n@vertex\nfn main_vs(@location(0) position: vec4, @builtin(instance_index) instance: u32) -> VertexOutput {\n var output: VertexOutput;\n\n // distribute instances into a staggered 4x4 grid\n const gridWidth = 125.0;\n const cellSize = gridWidth / 4.0;\n let row = instance / 2u;\n let col = instance % 2u;\n\n let xOffset = -gridWidth / 2.0 + cellSize / 2.0 + 2.0 * cellSize * f32(col) + f32(row % 2u != 0u) * cellSize;\n let zOffset = -gridWidth / 2.0 + cellSize / 2.0 + 2.0 + f32(row) * cellSize;\n\n let offsetPos = vec4(position.x + xOffset, position.y, position.z + zOffset, position.w);\n\n output.position = uniforms.modelViewProjectionMatrix * offsetPos;\n output.instance = instance;\n return output;\n}\n\n@fragment\nfn main_fs(@location(0) @interpolate(flat) instance: u32) -> @location(0) vec4 {\n const colors = array,6>(\n vec3(1.0, 0.0, 0.0),\n vec3(0.0, 1.0, 0.0),\n vec3(0.0, 0.0, 1.0),\n vec3(1.0, 0.0, 1.0),\n vec3(1.0, 1.0, 0.0),\n vec3(0.0, 1.0, 1.0),\n );\n\n return vec4(colors[instance % 6u], 1.0);\n}",u="struct Uniforms {\n modelViewProjectionMatrix: mat4x4,\n maxStorableFragments: u32,\n targetWidth: u32,\n};\n\nstruct SliceInfo {\n sliceStartY: i32\n};\n\nstruct Heads {\n numFragments: atomic,\n data: array>\n};\n\nstruct LinkedListElement {\n color: vec4,\n depth: f32,\n next: u32\n};\n\nstruct LinkedList {\n data: array\n};\n\n@binding(0) @group(0) var uniforms: Uniforms;\n@binding(1) @group(0) var heads: Heads;\n@binding(2) @group(0) var linkedList: LinkedList;\n@binding(3) @group(0) var opaqueDepthTexture: texture_depth_2d;\n@binding(4) @group(0) var sliceInfo: SliceInfo;\n\nstruct VertexOutput {\n @builtin(position) position: vec4,\n @location(0) @interpolate(flat) instance: u32\n};\n\n@vertex\nfn main_vs(@location(0) position: vec4, @builtin(instance_index) instance: u32) -> VertexOutput {\n var output: VertexOutput;\n\n // distribute instances into a staggered 4x4 grid\n const gridWidth = 125.0;\n const cellSize = gridWidth / 4.0;\n let row = instance / 2u;\n let col = instance % 2u;\n\n let xOffset = -gridWidth / 2.0 + cellSize / 2.0 + 2.0 * cellSize * f32(col) + f32(row % 2u == 0u) * cellSize;\n let zOffset = -gridWidth / 2.0 + cellSize / 2.0 + 2.0 + f32(row) * cellSize;\n\n let offsetPos = vec4(position.x + xOffset, position.y, position.z + zOffset, position.w);\n\n output.position = uniforms.modelViewProjectionMatrix * offsetPos;\n output.instance = instance;\n\n return output;\n}\n\n@fragment\nfn main_fs(@builtin(position) position: vec4, @location(0) @interpolate(flat) instance: u32) {\n const colors = array,6>(\n vec3(1.0, 0.0, 0.0),\n vec3(0.0, 1.0, 0.0),\n vec3(0.0, 0.0, 1.0),\n vec3(1.0, 0.0, 1.0),\n vec3(1.0, 1.0, 0.0),\n vec3(0.0, 1.0, 1.0),\n );\n\n let fragCoords = vec2(position.xy);\n let opaqueDepth = textureLoad(opaqueDepthTexture, fragCoords, 0);\n\n // reject fragments behind opaque objects\n if position.z >= opaqueDepth {\n discard;\n }\n\n // The index in the heads buffer corresponding to the head data for the fragment at\n // the current location.\n let headsIndex = u32(fragCoords.y - sliceInfo.sliceStartY) * uniforms.targetWidth + u32(fragCoords.x);\n\n // The index in the linkedList buffer at which to store the new fragment\n let fragIndex = atomicAdd(&heads.numFragments, 1u);\n\n // If we run out of space to store the fragments, we just lose them\n if fragIndex < uniforms.maxStorableFragments {\n let lastHead = atomicExchange(&heads.data[headsIndex], fragIndex);\n linkedList.data[fragIndex].depth = position.z;\n linkedList.data[fragIndex].next = lastHead;\n linkedList.data[fragIndex].color = vec4(colors[(instance + 3u) % 6u], 0.3);\n }\n}",c="struct Uniforms {\n modelViewProjectionMatrix: mat4x4,\n maxStorableFragments: u32,\n targetWidth: u32,\n};\n\nstruct SliceInfo {\n sliceStartY: i32\n};\n\nstruct Heads {\n numFragments: u32,\n data: array\n};\n\nstruct LinkedListElement {\n color: vec4,\n depth: f32,\n next: u32\n};\n\nstruct LinkedList {\n data: array\n};\n\n@binding(0) @group(0) var uniforms: Uniforms;\n@binding(1) @group(0) var heads: Heads;\n@binding(2) @group(0) var linkedList: LinkedList;\n@binding(3) @group(0) var sliceInfo: SliceInfo;\n\n// Output a full screen quad\n@vertex\nfn main_vs(@builtin(vertex_index) vertIndex: u32) -> @builtin(position) vec4 {\n const position = array, 6>(\n vec2(-1.0, -1.0),\n vec2(1.0, -1.0),\n vec2(1.0, 1.0),\n vec2(-1.0, -1.0),\n vec2(1.0, 1.0),\n vec2(-1.0, 1.0),\n );\n \n return vec4(position[vertIndex], 0.0, 1.0);\n}\n\n@fragment\nfn main_fs(@builtin(position) position: vec4) -> @location(0) vec4 {\n let fragCoords = vec2(position.xy);\n let headsIndex = u32(fragCoords.y - sliceInfo.sliceStartY) * uniforms.targetWidth + u32(fragCoords.x);\n\n // The maximum layers we can process for any pixel\n const maxLayers = 24u;\n\n var layers: array;\n\n var numLayers = 0u;\n var elementIndex = heads.data[headsIndex];\n\n // copy the list elements into an array up to the maximum amount of layers\n while elementIndex != 0xFFFFFFFFu && numLayers < maxLayers {\n layers[numLayers] = linkedList.data[elementIndex];\n numLayers++;\n elementIndex = linkedList.data[elementIndex].next;\n }\n\n if numLayers == 0u {\n discard;\n }\n \n // sort the fragments by depth\n for (var i = 1u; i < numLayers; i++) {\n let toInsert = layers[i];\n var j = i;\n\n while j > 0u && toInsert.depth > layers[j - 1u].depth {\n layers[j] = layers[j - 1u];\n j--;\n }\n\n layers[j] = toInsert;\n }\n\n // pre-multiply alpha for the first layer\n var color = vec4(layers[0].color.a * layers[0].color.rgb, layers[0].color.a);\n\n // blend the remaining layers\n for (var i = 1u; i < numLayers; i++) {\n let mixed = mix(color.rgb, layers[i].color.rgb, layers[i].color.aaa);\n color = vec4(mixed, color.a);\n }\n\n return color;\n}",f="src/sample/a-buffer/main.ts";let d=async e=>{let{canvas:n,pageState:t,gui:r}=e,a=await 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t=o.createTexture({size:[n.width,n.height],format:"depth24plus",usage:GPUTextureUsage.RENDER_ATTACHMENT|GPUTextureUsage.TEXTURE_BINDING,label:"depthTexture"}),r=t.createView({label:"depthTextureView"}),a=5*Float32Array.BYTES_PER_ELEMENT+1*Uint32Array.BYTES_PER_ELEMENT,l=4*n.width*a,u=Math.floor(o.limits.maxStorageBufferBindingSize/l),c=Math.ceil(n.height/u),d=Math.ceil(n.height/c),m=o.createBuffer({size:d*l,usage:GPUBufferUsage.STORAGE|GPUBufferUsage.COPY_DST,label:"linkedListBuffer"}),h=o.createBuffer({size:c*o.limits.minUniformBufferOffsetAlignment,usage:GPUBufferUsage.UNIFORM,mappedAtCreation:!0,label:"sliceInfoBuffer"});{let b=new Int32Array(h.getMappedRange()),v=o.limits.minUniformBufferOffsetAlignment/Int32Array.BYTES_PER_ELEMENT;for(let E=0;E{C=z()};r.add(p,"memoryStrategy",["multipass","clamp-pixel-ratio"]).onFinishChange(N),requestAnimationFrame(function e(){t.active&&(C(),requestAnimationFrame(e))})},m=()=>(0,r.Tl)({name:"A-Buffer",description:"Demonstrates order independent transparency using a per-pixel \n linked-list of translucent fragments. Provides a choice for \n limiting memory usage (when required).",gui:!0,init:d,sources:[{name:f.substring(20),contents:"import { mat4, vec3 } from 'wgpu-matrix';\nimport { makeSample, SampleInit } from '../../components/SampleLayout';\n\nimport { mesh } from '../../meshes/teapot';\n\nimport opaqueWGSL from './opaque.wgsl';\nimport translucentWGSL from './translucent.wgsl';\nimport compositeWGSL from './composite.wgsl';\n\nfunction roundUp(n: number, k: number): number {\n return Math.ceil(n / k) * k;\n}\n\nconst init: SampleInit = async ({ canvas, pageState, gui }) => {\n const adapter = await navigator.gpu.requestAdapter();\n const device = await adapter.requestDevice();\n\n if (!pageState.active) return;\n\n const context = canvas.getContext('webgpu') as GPUCanvasContext;\n const presentationFormat = navigator.gpu.getPreferredCanvasFormat();\n\n context.configure({\n device,\n format: presentationFormat,\n alphaMode: 'premultiplied',\n });\n\n const params = new URLSearchParams(window.location.search);\n\n const settings = {\n memoryStrategy: params.get('memoryStrategy') || 'multipass',\n };\n\n // Create the model vertex buffer\n const vertexBuffer = device.createBuffer({\n size: 3 * mesh.positions.length * Float32Array.BYTES_PER_ELEMENT,\n usage: GPUBufferUsage.VERTEX,\n mappedAtCreation: true,\n label: 'vertexBuffer',\n });\n {\n const mapping = new Float32Array(vertexBuffer.getMappedRange());\n for (let i = 0; i < mesh.positions.length; ++i) {\n mapping.set(mesh.positions[i], 3 * i);\n }\n vertexBuffer.unmap();\n }\n\n // Create the model index buffer\n const indexCount = mesh.triangles.length * 3;\n const indexBuffer = device.createBuffer({\n size: indexCount * Uint16Array.BYTES_PER_ELEMENT,\n usage: GPUBufferUsage.INDEX,\n mappedAtCreation: true,\n label: 'indexBuffer',\n });\n {\n const mapping = new Uint16Array(indexBuffer.getMappedRange());\n for (let i = 0; i < mesh.triangles.length; ++i) {\n mapping.set(mesh.triangles[i], 3 * i);\n }\n indexBuffer.unmap();\n }\n\n // Uniforms contains:\n // * modelViewProjectionMatrix: mat4x4\n // * maxStorableFragments: u32\n // * targetWidth: u32\n const uniformsSize = roundUp(\n 16 * Float32Array.BYTES_PER_ELEMENT + 2 * Uint32Array.BYTES_PER_ELEMENT,\n 16\n );\n\n const uniformBuffer = device.createBuffer({\n size: uniformsSize,\n usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST,\n label: 'uniformBuffer',\n });\n\n const opaqueModule = device.createShaderModule({\n code: opaqueWGSL,\n label: 'opaqueModule',\n });\n\n const opaquePipeline = device.createRenderPipeline({\n layout: 'auto',\n vertex: {\n module: opaqueModule,\n entryPoint: 'main_vs',\n buffers: [\n {\n arrayStride: 3 * Float32Array.BYTES_PER_ELEMENT,\n attributes: [\n {\n // position\n format: 'float32x3',\n offset: 0,\n shaderLocation: 0,\n },\n ],\n },\n ],\n },\n fragment: {\n module: opaqueModule,\n entryPoint: 'main_fs',\n targets: [\n {\n format: presentationFormat,\n },\n ],\n },\n primitive: {\n topology: 'triangle-list',\n },\n depthStencil: {\n depthWriteEnabled: true,\n depthCompare: 'less',\n format: 'depth24plus',\n },\n label: 'opaquePipeline',\n });\n\n const opaquePassDescriptor: GPURenderPassDescriptor = {\n colorAttachments: [\n {\n view: undefined,\n clearValue: { r: 0, g: 0, b: 0, a: 1.0 },\n loadOp: 'clear',\n storeOp: 'store',\n },\n ],\n depthStencilAttachment: {\n view: undefined,\n depthClearValue: 1.0,\n depthLoadOp: 'clear',\n depthStoreOp: 'store',\n },\n label: 'opaquePassDescriptor',\n };\n\n const opaqueBindGroup = device.createBindGroup({\n layout: opaquePipeline.getBindGroupLayout(0),\n entries: [\n {\n binding: 0,\n resource: {\n buffer: uniformBuffer,\n size: 16 * Float32Array.BYTES_PER_ELEMENT,\n label: 'modelViewProjection',\n },\n },\n ],\n label: 'opaquePipeline',\n });\n\n const translucentModule = device.createShaderModule({\n code: translucentWGSL,\n label: 'translucentModule',\n });\n\n const translucentBindGroupLayout = device.createBindGroupLayout({\n label: 'translucentBindGroupLayout',\n entries: [\n {\n binding: 0,\n visibility: GPUShaderStage.VERTEX | GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'uniform',\n },\n },\n {\n binding: 1,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'storage',\n },\n },\n {\n binding: 2,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'storage',\n },\n },\n {\n binding: 3,\n visibility: GPUShaderStage.FRAGMENT,\n texture: { sampleType: 'depth' },\n },\n {\n binding: 4,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'uniform',\n hasDynamicOffset: true,\n },\n },\n ],\n });\n\n const translucentPipeline = device.createRenderPipeline({\n layout: device.createPipelineLayout({\n bindGroupLayouts: [translucentBindGroupLayout],\n label: 'translucentPipelineLayout',\n }),\n vertex: {\n module: translucentModule,\n entryPoint: 'main_vs',\n buffers: [\n {\n arrayStride: 3 * Float32Array.BYTES_PER_ELEMENT,\n attributes: [\n {\n format: 'float32x3',\n offset: 0,\n shaderLocation: 0,\n },\n ],\n },\n ],\n },\n fragment: {\n module: translucentModule,\n entryPoint: 'main_fs',\n targets: [\n {\n format: presentationFormat,\n writeMask: 0x0,\n },\n ],\n },\n primitive: {\n topology: 'triangle-list',\n },\n label: 'translucentPipeline',\n });\n\n const translucentPassDescriptor: GPURenderPassDescriptor = {\n colorAttachments: [\n {\n loadOp: 'load',\n storeOp: 'store',\n view: undefined,\n },\n ],\n label: 'translucentPassDescriptor',\n };\n\n const compositeModule = device.createShaderModule({\n code: compositeWGSL,\n label: 'compositeModule',\n });\n\n const compositeBindGroupLayout = device.createBindGroupLayout({\n label: 'compositeBindGroupLayout',\n entries: [\n {\n binding: 0,\n visibility: GPUShaderStage.VERTEX | GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'uniform',\n },\n },\n {\n binding: 1,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'storage',\n },\n },\n {\n binding: 2,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'storage',\n },\n },\n {\n binding: 3,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'uniform',\n hasDynamicOffset: true,\n },\n },\n ],\n });\n\n const compositePipeline = device.createRenderPipeline({\n layout: device.createPipelineLayout({\n bindGroupLayouts: [compositeBindGroupLayout],\n label: 'compositePipelineLayout',\n }),\n vertex: {\n module: compositeModule,\n entryPoint: 'main_vs',\n },\n fragment: {\n module: compositeModule,\n entryPoint: 'main_fs',\n targets: [\n {\n format: presentationFormat,\n blend: {\n color: {\n srcFactor: 'one',\n operation: 'add',\n dstFactor: 'one-minus-src-alpha',\n },\n alpha: {},\n },\n },\n ],\n },\n primitive: {\n topology: 'triangle-list',\n },\n label: 'compositePipeline',\n });\n\n const compositePassDescriptor: GPURenderPassDescriptor = {\n colorAttachments: [\n {\n view: undefined,\n loadOp: 'load',\n storeOp: 'store',\n },\n ],\n label: 'compositePassDescriptor',\n };\n\n const configure = () => {\n let devicePixelRatio = window.devicePixelRatio;\n\n // The default maximum storage buffer binding size is 128Mib. The amount\n // of memory we need to store transparent fragments depends on the size\n // of the canvas and the average number of layers per fragment we want to\n // support. When the devicePixelRatio is 1, we know that 128Mib is enough\n // to store 4 layers per pixel at 600x600. However, when the device pixel\n // ratio is high enough we will exceed this limit.\n //\n // We provide 2 choices of mitigations to this issue:\n // 1) Clamp the device pixel ratio to a value which we know will not break\n // the limit. The tradeoff here is that the canvas resolution will not\n // match the native resolution and therefore may have a reduction in\n // quality.\n // 2) Break the frame into a series of horizontal slices using the scissor\n // functionality and process a single slice at a time. This limits memory\n // usage because we only need enough memory to process the dimensions\n // of the slice. The tradeoff is the performance reduction due to multiple\n // passes.\n if (settings.memoryStrategy === 'clamp-pixel-ratio') {\n devicePixelRatio = Math.min(window.devicePixelRatio, 3);\n }\n\n canvas.width = canvas.clientWidth * devicePixelRatio;\n canvas.height = canvas.clientHeight * devicePixelRatio;\n\n const depthTexture = device.createTexture({\n size: [canvas.width, canvas.height],\n format: 'depth24plus',\n usage:\n GPUTextureUsage.RENDER_ATTACHMENT | GPUTextureUsage.TEXTURE_BINDING,\n label: 'depthTexture',\n });\n\n const depthTextureView = depthTexture.createView({\n label: 'depthTextureView',\n });\n\n // Determines how much memory is allocated to store linked-list elements\n const averageLayersPerFragment = 4;\n\n // Each element stores\n // * color : vec4\n // * depth : f32\n // * index of next element in the list : u32\n const linkedListElementSize =\n 5 * Float32Array.BYTES_PER_ELEMENT + 1 * Uint32Array.BYTES_PER_ELEMENT;\n\n // We want to keep the linked-list buffer size under the maxStorageBufferBindingSize.\n // Split the frame into enough slices to meet that constraint.\n const bytesPerline =\n canvas.width * averageLayersPerFragment * linkedListElementSize;\n const maxLinesSupported = Math.floor(\n device.limits.maxStorageBufferBindingSize / bytesPerline\n );\n const numSlices = Math.ceil(canvas.height / maxLinesSupported);\n const sliceHeight = Math.ceil(canvas.height / numSlices);\n const linkedListBufferSize = sliceHeight * bytesPerline;\n\n const linkedListBuffer = device.createBuffer({\n size: linkedListBufferSize,\n usage: GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_DST,\n label: 'linkedListBuffer',\n });\n\n // To slice up the frame we need to pass the starting fragment y position of the slice.\n // We do this using a uniform buffer with a dynamic offset.\n const sliceInfoBuffer = device.createBuffer({\n size: numSlices * device.limits.minUniformBufferOffsetAlignment,\n usage: GPUBufferUsage.UNIFORM,\n mappedAtCreation: true,\n label: 'sliceInfoBuffer',\n });\n {\n const mapping = new Int32Array(sliceInfoBuffer.getMappedRange());\n\n // This assumes minUniformBufferOffsetAlignment is a multiple of 4\n const stride =\n device.limits.minUniformBufferOffsetAlignment /\n Int32Array.BYTES_PER_ELEMENT;\n for (let i = 0; i < numSlices; ++i) {\n mapping[i * stride] = i * sliceHeight;\n }\n sliceInfoBuffer.unmap();\n }\n\n // `Heads` struct contains the start index of the linked-list of translucent fragments\n // for a given pixel.\n // * numFragments : u32\n // * data : array\n const headsBuffer = device.createBuffer({\n size: (1 + canvas.width * sliceHeight) * Uint32Array.BYTES_PER_ELEMENT,\n usage: GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_DST,\n label: 'headsBuffer',\n });\n\n const headsInitBuffer = device.createBuffer({\n size: (1 + canvas.width * sliceHeight) * Uint32Array.BYTES_PER_ELEMENT,\n usage: GPUBufferUsage.COPY_SRC,\n mappedAtCreation: true,\n label: 'headsInitBuffer',\n });\n {\n const buffer = new Uint32Array(headsInitBuffer.getMappedRange());\n\n for (let i = 0; i < buffer.length; ++i) {\n buffer[i] = 0xffffffff;\n }\n\n headsInitBuffer.unmap();\n }\n\n const translucentBindGroup = device.createBindGroup({\n layout: translucentBindGroupLayout,\n entries: [\n {\n binding: 0,\n resource: {\n buffer: uniformBuffer,\n label: 'uniforms',\n },\n },\n {\n binding: 1,\n resource: {\n buffer: headsBuffer,\n label: 'headsBuffer',\n },\n },\n {\n binding: 2,\n resource: {\n buffer: linkedListBuffer,\n label: 'linkedListBuffer',\n },\n },\n {\n binding: 3,\n resource: depthTextureView,\n },\n {\n binding: 4,\n resource: {\n buffer: sliceInfoBuffer,\n size: device.limits.minUniformBufferOffsetAlignment,\n label: 'sliceInfoBuffer',\n },\n },\n ],\n label: 'translucentBindGroup',\n });\n\n const compositeBindGroup = device.createBindGroup({\n layout: compositePipeline.getBindGroupLayout(0),\n entries: [\n {\n binding: 0,\n resource: {\n buffer: uniformBuffer,\n label: 'uniforms',\n },\n },\n {\n binding: 1,\n resource: {\n buffer: headsBuffer,\n label: 'headsBuffer',\n },\n },\n {\n binding: 2,\n resource: {\n buffer: linkedListBuffer,\n label: 'linkedListBuffer',\n },\n },\n {\n binding: 3,\n resource: {\n buffer: sliceInfoBuffer,\n size: device.limits.minUniformBufferOffsetAlignment,\n label: 'sliceInfoBuffer',\n },\n },\n ],\n });\n\n opaquePassDescriptor.depthStencilAttachment.view = depthTextureView;\n\n // Rotates the camera around the origin based on time.\n function getCameraViewProjMatrix() {\n const aspect = canvas.width / canvas.height;\n\n const projectionMatrix = mat4.perspective(\n (2 * Math.PI) / 5,\n aspect,\n 1,\n 2000.0\n );\n\n const upVector = vec3.fromValues(0, 1, 0);\n const origin = vec3.fromValues(0, 0, 0);\n const eyePosition = vec3.fromValues(0, 5, -100);\n\n const rad = Math.PI * (Date.now() / 5000);\n const rotation = mat4.rotateY(mat4.translation(origin), rad);\n vec3.transformMat4(eyePosition, rotation, eyePosition);\n\n const viewMatrix = mat4.lookAt(eyePosition, origin, upVector);\n\n const viewProjMatrix = mat4.multiply(projectionMatrix, viewMatrix);\n return viewProjMatrix as Float32Array;\n }\n\n return function doDraw() {\n // update the uniform buffer\n {\n const buffer = new ArrayBuffer(uniformBuffer.size);\n\n new Float32Array(buffer).set(getCameraViewProjMatrix());\n new Uint32Array(buffer, 16 * Float32Array.BYTES_PER_ELEMENT).set([\n averageLayersPerFragment * canvas.width * sliceHeight,\n canvas.width,\n ]);\n\n device.queue.writeBuffer(uniformBuffer, 0, buffer);\n }\n\n const commandEncoder = device.createCommandEncoder();\n const textureView = context.getCurrentTexture().createView();\n\n // Draw the opaque objects\n opaquePassDescriptor.colorAttachments[0].view = textureView;\n const opaquePassEncoder =\n commandEncoder.beginRenderPass(opaquePassDescriptor);\n opaquePassEncoder.setPipeline(opaquePipeline);\n opaquePassEncoder.setBindGroup(0, opaqueBindGroup);\n opaquePassEncoder.setVertexBuffer(0, vertexBuffer);\n opaquePassEncoder.setIndexBuffer(indexBuffer, 'uint16');\n opaquePassEncoder.drawIndexed(mesh.triangles.length * 3, 8);\n opaquePassEncoder.end();\n\n for (let slice = 0; slice < numSlices; ++slice) {\n // initialize the heads buffer\n commandEncoder.copyBufferToBuffer(\n headsInitBuffer,\n 0,\n headsBuffer,\n 0,\n headsInitBuffer.size\n );\n\n const scissorX = 0;\n const scissorY = slice * sliceHeight;\n const scissorWidth = canvas.width;\n const scissorHeight =\n Math.min((slice + 1) * sliceHeight, canvas.height) -\n slice * sliceHeight;\n\n // Draw the translucent objects\n translucentPassDescriptor.colorAttachments[0].view = textureView;\n const translucentPassEncoder = commandEncoder.beginRenderPass(\n translucentPassDescriptor\n );\n\n // Set the scissor to only process a horizontal slice of the frame\n translucentPassEncoder.setScissorRect(\n scissorX,\n scissorY,\n scissorWidth,\n scissorHeight\n );\n\n translucentPassEncoder.setPipeline(translucentPipeline);\n translucentPassEncoder.setBindGroup(0, translucentBindGroup, [\n slice * device.limits.minUniformBufferOffsetAlignment,\n ]);\n translucentPassEncoder.setVertexBuffer(0, vertexBuffer);\n translucentPassEncoder.setIndexBuffer(indexBuffer, 'uint16');\n translucentPassEncoder.drawIndexed(mesh.triangles.length * 3, 8);\n translucentPassEncoder.end();\n\n // Composite the opaque and translucent objects\n compositePassDescriptor.colorAttachments[0].view = textureView;\n const compositePassEncoder = commandEncoder.beginRenderPass(\n compositePassDescriptor\n );\n\n // Set the scissor to only process a horizontal slice of the frame\n compositePassEncoder.setScissorRect(\n scissorX,\n scissorY,\n scissorWidth,\n scissorHeight\n );\n\n compositePassEncoder.setPipeline(compositePipeline);\n compositePassEncoder.setBindGroup(0, compositeBindGroup, [\n slice * device.limits.minUniformBufferOffsetAlignment,\n ]);\n compositePassEncoder.draw(6);\n compositePassEncoder.end();\n }\n\n device.queue.submit([commandEncoder.finish()]);\n };\n };\n\n let doDraw = configure();\n\n const updateSettings = () => {\n doDraw = configure();\n };\n\n gui\n .add(settings, 'memoryStrategy', ['multipass', 'clamp-pixel-ratio'])\n .onFinishChange(updateSettings);\n\n function frame() {\n // Sample is no longer the active page.\n if (!pageState.active) return;\n\n doDraw();\n\n requestAnimationFrame(frame);\n }\n\n requestAnimationFrame(frame);\n};\n\nconst ABuffer: () => JSX.Element = () =>\n makeSample({\n name: 'A-Buffer',\n description: `Demonstrates order independent transparency using a per-pixel \n linked-list of translucent fragments. Provides a choice for \n limiting memory usage (when required).`,\n gui: true,\n init,\n sources: [\n {\n name: __filename.substring(__dirname.length + 1),\n contents: __SOURCE__,\n },\n {\n name: 'opaque.wgsl',\n contents: opaqueWGSL,\n },\n {\n name: 'translucent.wgsl',\n contents: translucentWGSL,\n },\n {\n name: 'composite.wgsl',\n contents: compositeWGSL,\n },\n ],\n filename: __filename,\n });\n\nexport default ABuffer;\n"},{name:"opaque.wgsl",contents:l},{name:"translucent.wgsl",contents:u},{name:"composite.wgsl",contents:c}],filename:f});var 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\ No newline at end of file diff --git a/_next/static/chunks/webpack-2d4af2aa9b98b264.js b/_next/static/chunks/webpack-078c99310462cd53.js similarity index 98% rename from _next/static/chunks/webpack-2d4af2aa9b98b264.js rename to _next/static/chunks/webpack-078c99310462cd53.js index 7be4c3a9..76f2ef64 100644 --- a/_next/static/chunks/webpack-2d4af2aa9b98b264.js +++ b/_next/static/chunks/webpack-078c99310462cd53.js @@ -1 +1 @@ -!function(){"use strict";var e,t,r,n,f,a,c,o,i,u,b={},d={};function l(e){var t=d[e];if(void 0!==t)return t.exports;var r=d[e]={exports:{}},n=!0;try{b[e].call(r.exports,r,r.exports,l),n=!1}finally{n&&delete d[e]}return r.exports}l.m=b,e=[],l.O=function(t,r,n,f){if(r){f=f||0;for(var a=e.length;a>0&&e[a-1][2]>f;a--)e[a]=e[a-1];e[a]=[r,n,f];return}for(var c=1/0,a=0;a=f&&Object.keys(l.O).every(function(e){return l.O[e](r[i])})?r.splice(i--,1):(o=!1,f0&&e[a-1][2]>f;a--)e[a]=e[a-1];e[a]=[r,n,f];return}for(var c=1/0,a=0;a=f&&Object.keys(l.O).every(function(e){return l.O[e](r[i])})?r.splice(i--,1):(o=!1,fWebGPU Samples

The WebGPU Samples are a set of samples and demos demonstrating the use of the WebGPU API. Please see the current implementation status and how to run WebGPU in your browser at webgpu.io.

\ No newline at end of file +WebGPU Samples

The WebGPU Samples are a set of samples and demos demonstrating the use of the WebGPU API. Please see the current implementation status and how to run WebGPU in your browser at webgpu.io.

\ No newline at end of file diff --git a/samples/A-buffer.html b/samples/A-buffer.html index fd897742..66729d58 100644 --- a/samples/A-buffer.html +++ b/samples/A-buffer.html @@ -10,6 +10,6 @@ } A-Buffer - WebGPU Samples

A-Buffer

See it on Github!

Demonstrates order independent transparency using a per-pixel + limiting memory usage (when required)."/>

A-Buffer

See it on Github!

Demonstrates order independent transparency using a per-pixel linked-list of translucent fragments. Provides a choice for - limiting memory usage (when required).

\ No newline at end of file + limiting memory usage (when required).

\ No newline at end of file diff --git a/samples/animometer.html b/samples/animometer.html index b4107b8a..734115ef 100644 --- a/samples/animometer.html +++ b/samples/animometer.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Animometer - WebGPU Samples

Animometer

See it on Github!

A WebGPU port of the Animometer MotionMark benchmark.

\ No newline at end of file + Animometer - WebGPU Samples

Animometer

See it on Github!

A WebGPU port of the Animometer MotionMark benchmark.

\ No newline at end of file diff --git a/samples/bitonicSort.html b/samples/bitonicSort.html index 429be061..5414d0a8 100644 --- a/samples/bitonicSort.html +++ b/samples/bitonicSort.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Bitonic Sort - WebGPU Samples

Bitonic Sort

See it on Github!

A naive bitonic sort algorithm executed on the GPU, based on tgfrerer's implementation at poniesandlight.co.uk/reflect/bitonic_merge_sort/. Each invocation of the bitonic sort shader dispatches a workgroup containing elements/2 threads. The GUI's Execution Information folder contains information about the sort's current state. The visualizer displays the sort's results as colored cells sorted from brightest to darkest.

\ No newline at end of file + Bitonic Sort - WebGPU Samples

Bitonic Sort

See it on Github!

A naive bitonic sort algorithm executed on the GPU, based on tgfrerer's implementation at poniesandlight.co.uk/reflect/bitonic_merge_sort/. Each invocation of the bitonic sort shader dispatches a workgroup containing elements/2 threads. The GUI's Execution Information folder contains information about the sort's current state. The visualizer displays the sort's results as colored cells sorted from brightest to darkest.

\ No newline at end of file diff --git a/samples/cameras.html b/samples/cameras.html index bd250d6f..0ca0752b 100644 --- a/samples/cameras.html +++ b/samples/cameras.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Cameras - WebGPU Samples

Cameras

See it on Github!

This example provides example camera implementations

\ No newline at end of file + Cameras - WebGPU Samples

Cameras

See it on Github!

This example provides example camera implementations

\ No newline at end of file diff --git a/samples/computeBoids.html b/samples/computeBoids.html index 77b2f4c9..3f35572d 100644 --- a/samples/computeBoids.html +++ b/samples/computeBoids.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Compute Boids - WebGPU Samples

Compute Boids

See it on Github!

A GPU compute particle simulation that mimics the flocking behavior of birds. A compute shader updates two ping-pong buffers which store particle data. The data is used to draw instanced particles.

\ No newline at end of file + Compute Boids - WebGPU Samples

Compute Boids

See it on Github!

A GPU compute particle simulation that mimics the flocking behavior of birds. A compute shader updates two ping-pong buffers which store particle data. The data is used to draw instanced particles.

\ No newline at end of file diff --git a/samples/cornell.html b/samples/cornell.html index cdcf1c2b..0d28a981 100644 --- a/samples/cornell.html +++ b/samples/cornell.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Cornell box - WebGPU Samples

Cornell box

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A classic Cornell box, using a lightmap generated using software ray-tracing.

\ No newline at end of file + Cornell box - WebGPU Samples

Cornell box

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A classic Cornell box, using a lightmap generated using software ray-tracing.

\ No newline at end of file diff --git a/samples/cubemap.html b/samples/cubemap.html index a1b37ead..f7de5fd1 100644 --- a/samples/cubemap.html +++ b/samples/cubemap.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Cubemap - WebGPU Samples

Cubemap

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This example shows how to render and sample from a cubemap texture.

\ No newline at end of file + Cubemap - WebGPU Samples

Cubemap

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This example shows how to render and sample from a cubemap texture.

\ No newline at end of file diff --git a/samples/deferredRendering.html b/samples/deferredRendering.html index 2d88443a..e87b2707 100644 --- a/samples/deferredRendering.html +++ b/samples/deferredRendering.html @@ -16,7 +16,7 @@ We also update light position in a compute shader, where further operations like tile/cluster culling could happen. The debug view shows the depth buffer on the left (flipped and scaled a bit to make it more visible), the normal G buffer in the middle, and the albedo G-buffer on the right side of the screen. - "/>

Deferred Rendering

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This example shows how to do deferred rendering with webgpu. + "/>

Deferred Rendering

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This example shows how to do deferred rendering with webgpu. Render geometry info to multiple targets in the gBuffers in the first pass. In this sample we have 2 gBuffers for normals and albedo, along with a depth texture. And then do the lighting in a second pass with per fragment data read from gBuffers so it's independent of scene complexity. @@ -24,4 +24,4 @@ We also update light position in a compute shader, where further operations like tile/cluster culling could happen. The debug view shows the depth buffer on the left (flipped and scaled a bit to make it more visible), the normal G buffer in the middle, and the albedo G-buffer on the right side of the screen. -

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\ No newline at end of file diff --git a/samples/fractalCube.html b/samples/fractalCube.html index 3d72cb51..873f4c34 100644 --- a/samples/fractalCube.html +++ b/samples/fractalCube.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Fractal Cube - WebGPU Samples

Fractal Cube

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This example uses the previous frame's rendering result as the source texture for the next frame.

\ No newline at end of file + Fractal Cube - WebGPU Samples

Fractal Cube

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This example uses the previous frame's rendering result as the source texture for the next frame.

\ No newline at end of file diff --git a/samples/gameOfLife.html b/samples/gameOfLife.html index 7e89101b..6369801d 100644 --- a/samples/gameOfLife.html +++ b/samples/gameOfLife.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Conway's Game of Life - WebGPU Samples

Conway's Game of Life

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This example shows how to make Conway's game of life. First, use compute shader to calculate how cells grow or die. Then use render pipeline to draw cells by using instance mesh.

\ No newline at end of file + Conway's Game of Life - WebGPU Samples

Conway's Game of Life

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This example shows how to make Conway's game of life. First, use compute shader to calculate how cells grow or die. Then use render pipeline to draw cells by using instance mesh.

\ No newline at end of file diff --git a/samples/helloTriangle.html b/samples/helloTriangle.html index 7c410e00..d34d98b4 100644 --- a/samples/helloTriangle.html +++ b/samples/helloTriangle.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Hello Triangle - WebGPU Samples

Hello Triangle

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Shows rendering a basic triangle.

\ No newline at end of file + Hello Triangle - WebGPU Samples

Hello Triangle

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Shows rendering a basic triangle.

\ No newline at end of file diff --git a/samples/helloTriangleMSAA.html b/samples/helloTriangleMSAA.html index 368ea54b..701b726a 100644 --- a/samples/helloTriangleMSAA.html +++ b/samples/helloTriangleMSAA.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Hello Triangle MSAA - WebGPU Samples

Hello Triangle MSAA

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Shows multisampled rendering a basic triangle.

\ No newline at end of file + Hello Triangle MSAA - WebGPU Samples

Hello Triangle MSAA

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Shows multisampled rendering a basic triangle.

\ No newline at end of file diff --git a/samples/imageBlur.html b/samples/imageBlur.html index 10050a97..8872f38e 100644 --- a/samples/imageBlur.html +++ b/samples/imageBlur.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Image Blur - WebGPU Samples

Image Blur

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This example shows how to blur an image using a WebGPU compute shader.

\ No newline at end of file + Image Blur - WebGPU Samples

Image Blur

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This example shows how to blur an image using a WebGPU compute shader.

\ No newline at end of file diff --git a/samples/instancedCube.html b/samples/instancedCube.html index 2e3005fd..fe474e95 100644 --- a/samples/instancedCube.html +++ b/samples/instancedCube.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Instanced Cube - WebGPU Samples

Instanced Cube

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This example shows the use of instancing.

\ No newline at end of file + Instanced Cube - WebGPU Samples

Instanced Cube

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This example shows the use of instancing.

\ No newline at end of file diff --git a/samples/normalMap.html b/samples/normalMap.html index 2848708e..125cd45e 100644 --- a/samples/normalMap.html +++ b/samples/normalMap.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Normal Mapping - WebGPU Samples

Normal Mapping

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This example demonstrates multiple different methods that employ fragment shaders to achieve additional perceptual depth on the surface of a cube mesh. Demonstrated methods include normal mapping, parallax mapping, and steep parallax mapping.

\ No newline at end of file + Normal Mapping - WebGPU Samples

Normal Mapping

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This example demonstrates multiple different methods that employ fragment shaders to achieve additional perceptual depth on the surface of a cube mesh. Demonstrated methods include normal mapping, parallax mapping, and steep parallax mapping.

\ No newline at end of file diff --git a/samples/particles.html b/samples/particles.html index 2b5ebb75..1dabbc5a 100644 --- a/samples/particles.html +++ b/samples/particles.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Particles - WebGPU Samples

Particles

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This example demonstrates rendering of particles simulated with compute shaders.

\ No newline at end of file + Particles - WebGPU Samples

Particles

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This example demonstrates rendering of particles simulated with compute shaders.

\ No newline at end of file diff --git a/samples/renderBundles.html b/samples/renderBundles.html index 1b9815c8..c1007575 100644 --- a/samples/renderBundles.html +++ b/samples/renderBundles.html @@ -11,7 +11,7 @@ Render Bundles - WebGPU Samples

Render Bundles

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This example shows how to use render bundles. It renders a large number of + of instancing to reduce draw overhead.)"/>

Render Bundles

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This example shows how to use render bundles. It renders a large number of meshes individually as a proxy for a more complex scene in order to demonstrate the reduction in JavaScript time spent to issue render commands. (Typically a scene like this would make use - of instancing to reduce draw overhead.)

\ No newline at end of file + of instancing to reduce draw overhead.)

\ No newline at end of file diff --git a/samples/resizeCanvas.html b/samples/resizeCanvas.html index 1e47e5e4..adfc440a 100644 --- a/samples/resizeCanvas.html +++ b/samples/resizeCanvas.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Resize Canvas - WebGPU Samples

Resize Canvas

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Shows multisampled rendering a basic triangle on a dynamically sized canvas.

\ No newline at end of file + Resize Canvas - WebGPU Samples

Resize Canvas

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Shows multisampled rendering a basic triangle on a dynamically sized canvas.

\ No newline at end of file diff --git a/samples/reversedZ.html b/samples/reversedZ.html index 9fdb3c00..360bbbe9 100644 --- a/samples/reversedZ.html +++ b/samples/reversedZ.html @@ -17,7 +17,7 @@ Related reading: https://developer.nvidia.com/content/depth-precision-visualized https://thxforthefish.com/posts/reverse_z/ - "/>

Reversed Z

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This example shows the use of reversed z technique for better utilization of depth buffer precision. + "/>

Reversed Z

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This example shows the use of reversed z technique for better utilization of depth buffer precision. The left column uses regular method, while the right one uses reversed z technique. Both are using depth32float as their depth buffer format. A set of red and green planes are positioned very close to each other. Higher sets are placed further from camera (and are scaled for better visual purpose). @@ -26,4 +26,4 @@ Related reading: https://developer.nvidia.com/content/depth-precision-visualized https://thxforthefish.com/posts/reverse_z/ -

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\ No newline at end of file diff --git a/samples/rotatingCube.html b/samples/rotatingCube.html index f94bef28..e5de32ee 100644 --- a/samples/rotatingCube.html +++ b/samples/rotatingCube.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Rotating Cube - WebGPU Samples

Rotating Cube

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This example shows how to upload uniform data every frame to render a rotating object.

\ No newline at end of file + Rotating Cube - WebGPU Samples

Rotating Cube

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This example shows how to upload uniform data every frame to render a rotating object.

\ No newline at end of file diff --git a/samples/samplerParameters.html b/samples/samplerParameters.html index 1eb1a497..9119d034 100644 --- a/samples/samplerParameters.html +++ b/samples/samplerParameters.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Sampler Parameters - WebGPU Samples

Sampler Parameters

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Visualizes what all the sampler parameters do. Shows a textured plane at various scales (rotated, head-on, in perspective, and in vanishing perspective). The bottom-right view shows the raw contents of the 4 mipmap levels of the test texture (16x16, 8x8, 4x4, and 2x2).

\ No newline at end of file + Sampler Parameters - WebGPU Samples

Sampler Parameters

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Visualizes what all the sampler parameters do. Shows a textured plane at various scales (rotated, head-on, in perspective, and in vanishing perspective). The bottom-right view shows the raw contents of the 4 mipmap levels of the test texture (16x16, 8x8, 4x4, and 2x2).

\ No newline at end of file diff --git a/samples/shadowMapping.html b/samples/shadowMapping.html index 675c7d88..b523465f 100644 --- a/samples/shadowMapping.html +++ b/samples/shadowMapping.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Shadow Mapping - WebGPU Samples

Shadow Mapping

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This example shows how to sample from a depth texture to render shadows.

\ No newline at end of file + Shadow Mapping - WebGPU Samples

Shadow Mapping

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This example shows how to sample from a depth texture to render shadows.

\ No newline at end of file diff --git a/samples/texturedCube.html b/samples/texturedCube.html index 6f3293eb..3bc3d2a2 100644 --- a/samples/texturedCube.html +++ b/samples/texturedCube.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Textured Cube - WebGPU Samples

Textured Cube

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This example shows how to bind and sample textures.

\ No newline at end of file + Textured Cube - WebGPU Samples

Textured Cube

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This example shows how to bind and sample textures.

\ No newline at end of file diff --git a/samples/twoCubes.html b/samples/twoCubes.html index 3ad0d062..17d325e9 100644 --- a/samples/twoCubes.html +++ b/samples/twoCubes.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Two Cubes - WebGPU Samples

Two Cubes

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This example shows some of the alignment requirements involved when updating and binding multiple slices of a uniform buffer. It renders two rotating cubes which have transform matrices at different offsets in a uniform buffer.

\ No newline at end of file + Two Cubes - WebGPU Samples

Two Cubes

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This example shows some of the alignment requirements involved when updating and binding multiple slices of a uniform buffer. It renders two rotating cubes which have transform matrices at different offsets in a uniform buffer.

\ No newline at end of file diff --git a/samples/videoUploading.html b/samples/videoUploading.html index bb775426..d79b9d81 100644 --- a/samples/videoUploading.html +++ b/samples/videoUploading.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Video Uploading - WebGPU Samples

Video Uploading

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This example shows how to upload video frame to WebGPU.

\ No newline at end of file + Video Uploading - WebGPU Samples

Video Uploading

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This example shows how to upload video frame to WebGPU.

\ No newline at end of file diff --git a/samples/videoUploadingWebCodecs.html b/samples/videoUploadingWebCodecs.html index a2266f8c..e8cbbbe5 100644 --- a/samples/videoUploadingWebCodecs.html +++ b/samples/videoUploadingWebCodecs.html @@ -8,4 +8,4 @@ height: auto !important; overflow: visible !important; } - Video Uploading with WebCodecs - WebGPU Samples

Video Uploading with WebCodecs

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This example shows how to upload a WebCodecs VideoFrame to WebGPU.

\ No newline at end of file + Video Uploading with WebCodecs - WebGPU Samples

Video Uploading with WebCodecs

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This example shows how to upload a WebCodecs VideoFrame to WebGPU.

\ No newline at end of file diff --git a/samples/worker.html b/samples/worker.html index e77563b3..2443359b 100644 --- a/samples/worker.html +++ b/samples/worker.html @@ -10,6 +10,6 @@ } WebGPU in a Worker - WebGPU Samples

WebGPU in a Worker

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This example shows one method of using WebGPU in a web worker and presenting to + which is then transferred to the worker where all the WebGPU calls are made."/>

WebGPU in a Worker

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This example shows one method of using WebGPU in a web worker and presenting to the main thread. It uses canvas.transferControlToOffscreen() to produce an offscreen canvas - which is then transferred to the worker where all the WebGPU calls are made.

\ No newline at end of file + which is then transferred to the worker where all the WebGPU calls are made.

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