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Adding WebGPU to TODO.md. Annotating the parts of the WebGPU code that involve uniform buffer layout issues.

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Rezmason
2021-10-27 22:34:47 -07:00
parent c27c20f2cf
commit c3254c3aa1
4 changed files with 27 additions and 9 deletions
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3
TODO.txt
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@@ -1,5 +1,8 @@
TODO:
WebGPU
std140 problem with uniform buffers
Write an explanation of the rain pass (and include images)
Compute
Volumetric quads

28
js/webgpu_main.js
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@@ -33,7 +33,6 @@ export default async (canvas, config) => {
console.log(config);
const NUM_VERTICES_PER_QUAD = 6;
const THIRTY_TWO_BITS = 4; // 4 bytes = 32 bits
const numColumns = config.numColumns;
const numRows = config.numColumns;
@@ -70,7 +69,8 @@ export default async (canvas, config) => {
const msdfTexture = await loadTexture(device, config.glyphTexURL);
const configBufferSize = THIRTY_TWO_BITS * (1 * 1 + 1 * 1);
// prettier-ignore
const configBufferSize = Float32Array.BYTES_PER_ELEMENT * (1 + 1);
const configBuffer = device.createBuffer({
size: configBufferSize,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST, // Which of these are necessary?
@@ -79,7 +79,8 @@ export default async (canvas, config) => {
new Int32Array(configBuffer.getMappedRange()).set([numColumns, numRows]);
configBuffer.unmap();
const msdfBufferSize = THIRTY_TWO_BITS * (1 * 1);
// prettier-ignore
const msdfBufferSize = Float32Array.BYTES_PER_ELEMENT * (1);
const msdfBuffer = device.createBuffer({
size: msdfBufferSize,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.FRAGMENT | GPUBufferUsage.COPY_DST, // Which of these are necessary?
@@ -88,23 +89,34 @@ export default async (canvas, config) => {
new Int32Array(msdfBuffer.getMappedRange()).set([config.glyphTextureColumns]);
msdfBuffer.unmap();
const timeBufferSize = THIRTY_TWO_BITS * (1 * 1 + 1 * 1);
// prettier-ignore
const timeBufferSize = Float32Array.BYTES_PER_ELEMENT * (1 + 1);
const timeBuffer = device.createBuffer({
size: configBufferSize,
size: timeBufferSize,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.VERTEX | GPUBufferUsage.FRAGMENT | GPUBufferUsage.COMPUTE | GPUBufferUsage.COPY_DST, // Which of these are necessary?
});
const cameraBufferSize = THIRTY_TWO_BITS * (1 * 2);
// prettier-ignore
const cameraBufferSize = Float32Array.BYTES_PER_ELEMENT * (2 /* ??? */ + 2 + 16 + 16);
const cameraBuffer = device.createBuffer({
size: configBufferSize,
size: cameraBufferSize,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.VERTEX | GPUBufferUsage.COMPUTE | GPUBufferUsage.COPY_DST, // Which of these are necessary?
});
const { mat4, vec3 } = glMatrix;
const camera = mat4.create();
const translation = vec3.set(vec3.create(), 0, 0.5 / numRows, -1);
const scale = vec3.set(vec3.create(), 1, 1, 1);
const transform = mat4.create();
mat4.translate(transform, transform, translation);
mat4.scale(transform, transform, scale);
const updateCameraBuffer = () => {
const canvasSize = canvasConfig.size;
const aspectRatio = canvasSize[0] / canvasSize[1];
mat4.perspective(camera, (Math.PI / 180) * 90, aspectRatio, 0.0001, 1000);
const screenSize = aspectRatio > 1 ? [1, aspectRatio] : [1 / aspectRatio, 1];
queue.writeBuffer(cameraBuffer, 0, new Float32Array(screenSize));
queue.writeBuffer(cameraBuffer, 0, new Float32Array([...screenSize, /* ??? */ -1, -1, ...camera, ...transform]));
};
updateCameraBuffer();

2
shaders/rainRenderPass.wgsl
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@@ -23,6 +23,8 @@ let TWO_PI:f32 = 6.28318530718; // No, I'm not using Tau.
[[block]] struct CameraUniforms {
screenSize: vec2<f32>;
camera: mat4x4<f32>;
transform: mat4x4<f32>;
};
[[group(0), binding(5)]] var<uniform> cameraUniforms:CameraUniforms;

3
webgpu_notes.txt
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@@ -41,4 +41,5 @@ Textures were never resizable, you simply forgot
Bind groups let you bind a bunch of resources at once
Render bundles let you reissue commands
You can only use up to FOUR bind groups on your laptop's device!
You can only use up to FOUR bind groups on your laptop's device!
Here's an annoying gotcha: uniform buffers are like classic UBOs, and have esoteric ("std140") layout requirements!