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interop-demo-2.html
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interop-demo-2.html
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<!doctype html>
<html>
<head>
</head>
<body>
<p>Use WebGPU combined with Canvas2D</p>
<canvas id=c width=256 height=256></canvas>
<canvas id=d width=256 height=256></canvas>
<script type="module">
import "./webgpu-polyfill.js";
import { mat4, vec3 } from './wgpu-matrix.module.js';
const cubeVertexSize = 4 * 10; // Byte size of one cube vertex.
const cubePositionOffset = 0;
const cubeColorOffset = 4 * 4; // Byte offset of cube vertex color attribute.
const cubeUVOffset = 4 * 8;
const cubeVertexCount = 36;
// prettier-ignore
const cubeVertexArray = new Float32Array([
// float4 position, float4 color, float2 uv,
1, -1, 1, 1, 1, 0, 1, 1, 0, 1,
-1, -1, 1, 1, 0, 0, 1, 1, 1, 1,
-1, -1, -1, 1, 0, 0, 0, 1, 1, 0,
1, -1, -1, 1, 1, 0, 0, 1, 0, 0,
1, -1, 1, 1, 1, 0, 1, 1, 0, 1,
-1, -1, -1, 1, 0, 0, 0, 1, 1, 0,
1, 1, 1, 1, 1, 1, 1, 1, 0, 1,
1, -1, 1, 1, 1, 0, 1, 1, 1, 1,
1, -1, -1, 1, 1, 0, 0, 1, 1, 0,
1, 1, -1, 1, 1, 1, 0, 1, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 0, 1,
1, -1, -1, 1, 1, 0, 0, 1, 1, 0,
-1, 1, 1, 1, 0, 1, 1, 1, 0, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, -1, 1, 1, 1, 0, 1, 1, 0,
-1, 1, -1, 1, 0, 1, 0, 1, 0, 0,
-1, 1, 1, 1, 0, 1, 1, 1, 0, 1,
1, 1, -1, 1, 1, 1, 0, 1, 1, 0,
-1, -1, 1, 1, 0, 0, 1, 1, 0, 1,
-1, 1, 1, 1, 0, 1, 1, 1, 1, 1,
-1, 1, -1, 1, 0, 1, 0, 1, 1, 0,
-1, -1, -1, 1, 0, 0, 0, 1, 0, 0,
-1, -1, 1, 1, 0, 0, 1, 1, 0, 1,
-1, 1, -1, 1, 0, 1, 0, 1, 1, 0,
1, 1, 1, 1, 1, 1, 1, 1, 0, 1,
-1, 1, 1, 1, 0, 1, 1, 1, 1, 1,
-1, -1, 1, 1, 0, 0, 1, 1, 1, 0,
-1, -1, 1, 1, 0, 0, 1, 1, 1, 0,
1, -1, 1, 1, 1, 0, 1, 1, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 0, 1,
1, -1, -1, 1, 1, 0, 0, 1, 0, 1,
-1, -1, -1, 1, 0, 0, 0, 1, 1, 1,
-1, 1, -1, 1, 0, 1, 0, 1, 1, 0,
1, 1, -1, 1, 1, 1, 0, 1, 0, 0,
1, -1, -1, 1, 1, 0, 0, 1, 0, 1,
-1, 1, -1, 1, 0, 1, 0, 1, 1, 0,
]);
const basicVertWGSL = `
struct Uniforms {
modelViewProjectionMatrix : mat4x4<f32>,
}
@binding(0) @group(0) var<uniform> uniforms : Uniforms;
struct VertexOutput {
@builtin(position) Position : vec4<f32>,
@location(0) fragUV : vec2<f32>,
@location(1) fragPosition: vec4<f32>,
}
@vertex
fn main(
@location(0) position : vec4<f32>,
@location(1) uv : vec2<f32>
) -> VertexOutput {
var output : VertexOutput;
output.Position = uniforms.modelViewProjectionMatrix * position;
output.fragUV = uv;
output.fragPosition = 0.5 * (position + vec4(1.0, 1.0, 1.0, 1.0));
return output;
}
`;
const sampleTextureMixColorWGSL = `
@group(0) @binding(1) var mySampler: sampler;
@group(0) @binding(2) var myTexture: texture_2d<f32>;
@fragment
fn main(
@location(0) fragUV: vec2<f32>,
@location(1) fragPosition: vec4<f32>
) -> @location(0) vec4<f32> {
return textureSample(myTexture, mySampler, fragUV) * fragPosition;
}
`;
const init = async ({ canvas }) => {
const adapter = await navigator.gpu.requestAdapter();
const device = await adapter.requestDevice();
const context = canvas.getContext('webgpu');
const tc = document.getElementById("d");
const ctx = tc.getContext("2d");
const presentationFormat = ctx.getTextureFormat();
context.configure({
device,
format: presentationFormat,
alphaMode: 'premultiplied',
});
// Create a vertex buffer from the cube data.
const verticesBuffer = device.createBuffer({
size: cubeVertexArray.byteLength,
usage: GPUBufferUsage.VERTEX,
mappedAtCreation: true,
});
new Float32Array(verticesBuffer.getMappedRange()).set(cubeVertexArray);
verticesBuffer.unmap();
const pipeline = device.createRenderPipeline({
layout: 'auto',
vertex: {
module: device.createShaderModule({
code: basicVertWGSL,
}),
entryPoint: 'main',
buffers: [
{
arrayStride: cubeVertexSize,
attributes: [
{
// position
shaderLocation: 0,
offset: cubePositionOffset,
format: 'float32x4',
},
{
// uv
shaderLocation: 1,
offset: cubeUVOffset,
format: 'float32x2',
},
],
},
],
},
fragment: {
module: device.createShaderModule({
code: sampleTextureMixColorWGSL,
}),
entryPoint: 'main',
targets: [
{
format: presentationFormat,
},
],
},
primitive: {
topology: 'triangle-list',
// Backface culling since the cube is solid piece of geometry.
// Faces pointing away from the camera will be occluded by faces
// pointing toward the camera.
cullMode: 'back',
},
// Enable depth testing so that the fragment closest to the camera
// is rendered in front.
depthStencil: {
depthWriteEnabled: true,
depthCompare: 'less',
format: 'depth24plus',
},
});
const depthTexture = device.createTexture({
size: [canvas.width, canvas.height],
format: 'depth24plus',
usage: GPUTextureUsage.RENDER_ATTACHMENT,
});
const uniformBufferSize = 4 * 16; // 4x4 matrix
const uniformBuffer = device.createBuffer({
size: uniformBufferSize,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST,
});
// Fetch the image and upload it into a GPUTexture.
const response = await fetch(
new URL('./Di-3d.png', import.meta.url).toString()
);
const imageBitmap = await createImageBitmap(await response.blob());
let cubeTexture = device.createTexture({
size: [imageBitmap.width, imageBitmap.height, 1],
format: 'rgba8unorm',
usage:
GPUTextureUsage.TEXTURE_BINDING |
GPUTextureUsage.COPY_DST |
GPUTextureUsage.RENDER_ATTACHMENT,
});
device.queue.copyExternalImageToTexture(
{ source: imageBitmap },
{ texture: cubeTexture },
[imageBitmap.width, imageBitmap.height]
);
// Create a sampler with linear filtering for smooth interpolation.
const sampler = device.createSampler({
magFilter: 'linear',
minFilter: 'linear',
});
const uniformBindGroup = device.createBindGroup({
layout: pipeline.getBindGroupLayout(0),
entries: [
{
binding: 0,
resource: {
buffer: uniformBuffer,
},
},
{
binding: 1,
resource: sampler,
},
{
binding: 2,
resource: cubeTexture.createView(),
},
],
});
const renderPassDescriptor = {
colorAttachments: [
{
view: undefined, // Assigned later
loadOp: 'load',
storeOp: 'store',
},
],
depthStencilAttachment: {
view: depthTexture.createView(),
depthClearValue: 1.0,
depthLoadOp: 'clear',
depthStoreOp: 'store',
},
};
const aspect = canvas.width / canvas.height;
const projectionMatrix = mat4.perspective(
(2 * Math.PI) / 5,
aspect,
1,
100.0
);
const modelViewProjectionMatrix = mat4.create();
function getTransformationMatrix() {
const viewMatrix = mat4.identity();
mat4.translate(viewMatrix, vec3.fromValues(0, 0, -4), viewMatrix);
const now = Date.now() / 1000;
mat4.rotate(
viewMatrix,
vec3.fromValues(Math.sin(now), Math.cos(now), 0),
1,
viewMatrix
);
mat4.multiply(projectionMatrix, viewMatrix, modelViewProjectionMatrix);
return modelViewProjectionMatrix;
}
function frame() {
ctx.reset();
ctx.font = "bold 80px Arial";
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 256, 256);
ctx.fillStyle = "blue";
ctx.textAlign = "center";
ctx.fillText("Hello", 128, 100);
const texture = ctx.transferToGPUTexture({device});
const transformationMatrix = getTransformationMatrix();
device.queue.writeBuffer(
uniformBuffer,
0,
transformationMatrix.buffer,
transformationMatrix.byteOffset,
transformationMatrix.byteLength
);
renderPassDescriptor.colorAttachments[0].view = texture.createView();
const commandEncoder = device.createCommandEncoder();
const passEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);
passEncoder.setPipeline(pipeline);
passEncoder.setBindGroup(0, uniformBindGroup);
passEncoder.setVertexBuffer(0, verticesBuffer);
passEncoder.draw(cubeVertexCount);
passEncoder.end();
device.queue.submit([commandEncoder.finish()]);
ctx.transferBackFromGPUTexture();
ctx.fillStyle = "green";
ctx.textAlign = "center";
ctx.fillText("Hello", 128, 200);
requestAnimationFrame(frame);
}
frame();
};
const canvas = document.getElementById("c");
init({canvas});
</script>
</body>
</html>