bellbind/index.html

## index.html
<!doctype html>
<html>
  <head>
    <!-- IMPORTANT: The current Chrome requires some origin-trial token in <meta>.
         To register origins at the last "WebGPU REGISTER" in https://developer.chrome.com/origintrials/
         This token is for a Web Origin "http://localhost:8000" (maybe expired at Mar 31, 2022)
      -->
    <meta http-equiv="origin-trial"
          content="AkIL+/THBoi1QEsWbX5SOuMpL6+KGAXKrZE5Bz6yHTuijzvKz2MznuLqE+MH4YSqRi/v1fDK/6JyFzgibTTeNAsAAABJeyJvcmlnaW4iOiJodHRwOi8vbG9jYWxob3N0OjgwMDAiLCJmZWF0dXJlIjoiV2ViR1BVIiwiZXhwaXJ5IjoxNjUyODMxOTk5fQ==" />
    <meta http-equiv="origin-trial"
          content="Akv07qcAop5MFaZYxJtHHjUuM8eV3GpbHkTeuhZo/4wsNjYnQ7GSGJyo7hRVZvpvyjYwilbJ8KbFVchI4O1DpA0AAABQeyJvcmlnaW4iOiJodHRwczovL2dpc3QuZ2l0aGFjay5jb206NDQzIiwiZmVhdHVyZSI6IldlYkdQVSIsImV4cGlyeSI6MTY1MjgzMTk5OX0=" />
    <script src="./main.js" type="module"></script>
    <style>@media(prefers-color-scheme: dark){:root {color-scheme: dark;}}</style>
    <link rel="icon" href="data:image/x-icon;," />
  </head>
  <body>
    <h1>(Notice: The origin-trial token in this page will be expired at May 15, 2022)</h1>
    <canvas style="width: 80vmin; height: 80vmin; border: solid;" id="canvas"></canvas>
  </body>
</html>

## main.js
// Image texture example for WebGPU API for Chrome-100: https://www.w3.org/TR/webgpu/
const adapter = await navigator.gpu.requestAdapter();
const device = await adapter.requestDevice();

// prepare image
const img = new Image();
img.src = "data:image/svg+xml," + encodeURIComponent(`
<svg xmlns="http://www.w3.org/2000/svg" width="900" height="600">
  <rect fill="#ffffff" width="900" height="600" />
  <circle fill="#bc002d" cx="450" cy="300" r="180" />
</svg>
`);
await img.decode();
const bitmap = await createImageBitmap(img);
const max = Math.max(bitmap.width, bitmap.height);
const [w, h] = [bitmap.width / max, bitmap.height / max];

// triangle-strip square: 4-(x,y, u, v); top-left: (u,v)=(0,0)
const square = new Float32Array([
  -w, -h, 0, 1,
  -w, +h, 0, 0,
  +w, -h, 1, 1,
  +w, +h, 1, 0,
]);
const vertexBuffer = device.createBuffer({size: square.byteLength, usage: GPUBufferUsage.VERTEX, mappedAtCreation: true});
new Float32Array(vertexBuffer.getMappedRange()).set(square);
vertexBuffer.unmap();
const stride = {arrayStride: 4 * square.BYTES_PER_ELEMENT, attributes: [
  {shaderLocation: 0, offset: 0, format: "float32x2"},
  {shaderLocation: 1, offset: 2 * square.BYTES_PER_ELEMENT, format: "float32x2"},
]};

// WGSL shaders: https://www.w3.org/TR/WGSL/
const vertexWgsl = `
struct Out {
@builtin(position) pos: vec4<f32>;
@location(0) uv: vec2<f32>;
};
@stage(vertex) fn main(@location(0) xy: vec2<f32>, @location(1) uv: vec2<f32>) -> Out {
  return Out(vec4<f32>(xy, 0.0, 1.0), uv);
}
`;
const vertexShader = device.createShaderModule({code: vertexWgsl});
const fragmentWgsl = `
@group(0) @binding(0) var samp: sampler;
@group(0) @binding(1) var tex: texture_2d<f32>;
@stage(fragment) fn main(@location(0) uv: vec2<f32>) -> @location(0) vec4<f32> {
  return textureSample(tex, samp, uv);
}
`;
const fragmentShader = device.createShaderModule({code: fragmentWgsl});

// gpu config for canvas
const canvas = document.getElementById("canvas");
const gpu = canvas.getContext("webgpu");
const format = gpu.getPreferredFormat(adapter);
gpu.configure({device, format, size: [canvas.width, canvas.height]});

// texture and sampler
const samp = device.createSampler({minFilter: "linear", magFilter: "linear"});
const tex = device.createTexture({
  format: "rgba8unorm", size: [bitmap.width, bitmap.height],
  usage: GPUTextureUsage.TEXTURE_BINDING | GPUTextureUsage.COPY_DST | GPUTextureUsage.RENDER_ATTACHMENT,
});
device.queue.copyExternalImageToTexture({source: bitmap}, {texture: tex}, [bitmap.width, bitmap.height]);

// pipeline
const pipeline = device.createRenderPipeline({
  primitive: {topology: "triangle-strip"},
  vertex: {module: vertexShader, entryPoint: "main", buffers: [stride]},
  fragment: {module: fragmentShader, entryPoint: "main", targets: [{format}]},
});

// bind group
const bindGroupLayout = pipeline.getBindGroupLayout(0);
const bindGroup = device.createBindGroup({
  layout: bindGroupLayout,
  entries: [
    {binding: 0, resource: samp},
    {binding: 1, resource: tex.createView()},
  ]
});

// render
const render = () => {
  const view = gpu.getCurrentTexture().createView();
  const renderPass = {colorAttachments: [{view, loadOp: "clear", clearValue: {r: 0, g: 0, b: 0, a: 1}, storeOp: "store"}]};
  const commandEncoder = device.createCommandEncoder();
  const passEncoder = commandEncoder.beginRenderPass(renderPass);
  passEncoder.setPipeline(pipeline);
  passEncoder.setBindGroup(0, bindGroup);
  passEncoder.setVertexBuffer(0, vertexBuffer);
  passEncoder.draw(4,  1);
  passEncoder.end();
  device.queue.submit([commandEncoder.finish()]);
};
(function loop() {
  render();
  requestAnimationFrame(loop);
})();
	<!doctype html>
	<html>
	<head>
	<!-- IMPORTANT: The current Chrome requires some origin-trial token in <meta>.
	To register origins at the last "WebGPU REGISTER" in https://developer.chrome.com/origintrials/
	This token is for a Web Origin "http://localhost:8000" (maybe expired at Mar 31, 2022)
	-->
	<meta http-equiv="origin-trial"
	content="AkIL+/THBoi1QEsWbX5SOuMpL6+KGAXKrZE5Bz6yHTuijzvKz2MznuLqE+MH4YSqRi/v1fDK/6JyFzgibTTeNAsAAABJeyJvcmlnaW4iOiJodHRwOi8vbG9jYWxob3N0OjgwMDAiLCJmZWF0dXJlIjoiV2ViR1BVIiwiZXhwaXJ5IjoxNjUyODMxOTk5fQ==" />
	<meta http-equiv="origin-trial"
	content="Akv07qcAop5MFaZYxJtHHjUuM8eV3GpbHkTeuhZo/4wsNjYnQ7GSGJyo7hRVZvpvyjYwilbJ8KbFVchI4O1DpA0AAABQeyJvcmlnaW4iOiJodHRwczovL2dpc3QuZ2l0aGFjay5jb206NDQzIiwiZmVhdHVyZSI6IldlYkdQVSIsImV4cGlyeSI6MTY1MjgzMTk5OX0=" />
	<script src="./main.js" type="module"></script>
	<style>@media(prefers-color-scheme: dark){:root {color-scheme: dark;}}</style>
	<link rel="icon" href="data:image/x-icon;," />
	</head>
	<body>
	<h1>(Notice: The origin-trial token in this page will be expired at May 15, 2022)</h1>
	<canvas style="width: 80vmin; height: 80vmin; border: solid;" id="canvas"></canvas>
	</body>
	</html>
	// Image texture example for WebGPU API for Chrome-100: https://www.w3.org/TR/webgpu/
	const adapter = await navigator.gpu.requestAdapter();
	const device = await adapter.requestDevice();

	// prepare image
	const img = new Image();
	img.src = "data:image/svg+xml," + encodeURIComponent(`
	<svg xmlns="http://www.w3.org/2000/svg" width="900" height="600">
	<rect fill="#ffffff" width="900" height="600" />
	<circle fill="#bc002d" cx="450" cy="300" r="180" />
	</svg>
	`);
	await img.decode();
	const bitmap = await createImageBitmap(img);
	const max = Math.max(bitmap.width, bitmap.height);
	const [w, h] = [bitmap.width / max, bitmap.height / max];

	// triangle-strip square: 4-(x,y, u, v); top-left: (u,v)=(0,0)
	const square = new Float32Array([
	-w, -h, 0, 1,
	-w, +h, 0, 0,
	+w, -h, 1, 1,
	+w, +h, 1, 0,
	]);
	const vertexBuffer = device.createBuffer({size: square.byteLength, usage: GPUBufferUsage.VERTEX, mappedAtCreation: true});
	new Float32Array(vertexBuffer.getMappedRange()).set(square);
	vertexBuffer.unmap();
	const stride = {arrayStride: 4 * square.BYTES_PER_ELEMENT, attributes: [
	{shaderLocation: 0, offset: 0, format: "float32x2"},
	{shaderLocation: 1, offset: 2 * square.BYTES_PER_ELEMENT, format: "float32x2"},
	]};

	// WGSL shaders: https://www.w3.org/TR/WGSL/
	const vertexWgsl = `
	struct Out {
	@builtin(position) pos: vec4<f32>;
	@location(0) uv: vec2<f32>;
	};
	@stage(vertex) fn main(@location(0) xy: vec2<f32>, @location(1) uv: vec2<f32>) -> Out {
	return Out(vec4<f32>(xy, 0.0, 1.0), uv);
	}
	`;
	const vertexShader = device.createShaderModule({code: vertexWgsl});
	const fragmentWgsl = `
	@group(0) @binding(0) var samp: sampler;
	@group(0) @binding(1) var tex: texture_2d<f32>;
	@stage(fragment) fn main(@location(0) uv: vec2<f32>) -> @location(0) vec4<f32> {
	return textureSample(tex, samp, uv);
	}
	`;
	const fragmentShader = device.createShaderModule({code: fragmentWgsl});

	// gpu config for canvas
	const canvas = document.getElementById("canvas");
	const gpu = canvas.getContext("webgpu");
	const format = gpu.getPreferredFormat(adapter);
	gpu.configure({device, format, size: [canvas.width, canvas.height]});

	// texture and sampler
	const samp = device.createSampler({minFilter: "linear", magFilter: "linear"});
	const tex = device.createTexture({
	format: "rgba8unorm", size: [bitmap.width, bitmap.height],
	usage: GPUTextureUsage.TEXTURE_BINDING \| GPUTextureUsage.COPY_DST \| GPUTextureUsage.RENDER_ATTACHMENT,
	});
	device.queue.copyExternalImageToTexture({source: bitmap}, {texture: tex}, [bitmap.width, bitmap.height]);

	// pipeline
	const pipeline = device.createRenderPipeline({
	primitive: {topology: "triangle-strip"},
	vertex: {module: vertexShader, entryPoint: "main", buffers: [stride]},
	fragment: {module: fragmentShader, entryPoint: "main", targets: [{format}]},
	});

	// bind group
	const bindGroupLayout = pipeline.getBindGroupLayout(0);
	const bindGroup = device.createBindGroup({
	layout: bindGroupLayout,
	entries: [
	{binding: 0, resource: samp},
	{binding: 1, resource: tex.createView()},
	]
	});

	// render
	const render = () => {
	const view = gpu.getCurrentTexture().createView();
	const renderPass = {colorAttachments: [{view, loadOp: "clear", clearValue: {r: 0, g: 0, b: 0, a: 1}, storeOp: "store"}]};
	const commandEncoder = device.createCommandEncoder();
	const passEncoder = commandEncoder.beginRenderPass(renderPass);
	passEncoder.setPipeline(pipeline);
	passEncoder.setBindGroup(0, bindGroup);
	passEncoder.setVertexBuffer(0, vertexBuffer);
	passEncoder.draw(4, 1);
	passEncoder.end();
	device.queue.submit([commandEncoder.finish()]);
	};
	(function loop() {
	render();
	requestAnimationFrame(loop);
	})();