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export const description = `
Stress tests covering vertex buffer usage.
`;
import { makeTestGroup } from '../../common/framework/test_group.js';
import { GPUTest } from '../../webgpu/gpu_test.js';
export const g = makeTestGroup(GPUTest);
function createHugeVertexBuffer(t: GPUTest, size: number) {
const kBufferSize = size * size * 8;
const buffer = t.device.createBuffer({
size: kBufferSize,
usage: GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_SRC,
});
const pipeline = t.device.createComputePipeline({
layout: 'auto',
compute: {
module: t.device.createShaderModule({
code: `
struct Buffer { data: array<vec2<u32>>, };
@group(0) @binding(0) var<storage, read_write> buffer: Buffer;
@compute @workgroup_size(1) fn main(
@builtin(global_invocation_id) id: vec3<u32>) {
let base = id.x * ${size}u;
for (var x: u32 = 0u; x < ${size}u; x = x + 1u) {
buffer.data[base + x] = vec2<u32>(x, id.x);
}
}
`,
}),
entryPoint: 'main',
},
});
const bindGroup = t.device.createBindGroup({
layout: pipeline.getBindGroupLayout(0),
entries: [
{
binding: 0,
resource: { buffer },
},
],
});
const encoder = t.device.createCommandEncoder();
const pass = encoder.beginComputePass();
pass.setPipeline(pipeline);
pass.setBindGroup(0, bindGroup);
pass.dispatchWorkgroups(size);
pass.end();
const vertexBuffer = t.device.createBuffer({
size: kBufferSize,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST,
});
encoder.copyBufferToBuffer(buffer, 0, vertexBuffer, 0, kBufferSize);
t.device.queue.submit([encoder.finish()]);
return vertexBuffer;
}
g.test('many')
.desc(`Tests execution of draw calls using a huge vertex buffer.`)
.fn(async t => {
const kSize = 4096;
const buffer = createHugeVertexBuffer(t, kSize);
const module = t.device.createShaderModule({
code: `
@vertex fn vmain(@location(0) position: vec2<u32>)
-> @builtin(position) vec4<f32> {
let r = vec2<f32>(1.0 / f32(${kSize}));
let a = 2.0 * r;
let b = r - vec2<f32>(1.0);
return vec4<f32>(fma(vec2<f32>(position), a, b), 0.0, 1.0);
}
@fragment fn fmain() -> @location(0) vec4<f32> {
return vec4<f32>(1.0, 0.0, 1.0, 1.0);
}
`,
});
const pipeline = t.device.createRenderPipeline({
layout: 'auto',
vertex: {
module,
entryPoint: 'vmain',
buffers: [
{
arrayStride: 8,
attributes: [
{
format: 'uint32x2',
offset: 0,
shaderLocation: 0,
},
],
},
],
},
primitive: { topology: 'point-list' },
fragment: {
targets: [{ format: 'rgba8unorm' }],
module,
entryPoint: 'fmain',
},
});
const renderTarget = t.device.createTexture({
size: [kSize, kSize],
usage: GPUTextureUsage.RENDER_ATTACHMENT | GPUTextureUsage.COPY_SRC,
format: 'rgba8unorm',
});
const renderPassDescriptor: GPURenderPassDescriptor = {
colorAttachments: [
{
view: renderTarget.createView(),
loadOp: 'load',
storeOp: 'store',
},
],
};
const encoder = t.device.createCommandEncoder();
const pass = encoder.beginRenderPass(renderPassDescriptor);
pass.setPipeline(pipeline);
pass.setVertexBuffer(0, buffer);
pass.draw(kSize * kSize);
pass.end();
t.device.queue.submit([encoder.finish()]);
t.expectSingleColor(renderTarget, 'rgba8unorm', {
size: [kSize, kSize, 1],
exp: { R: 1, G: 0, B: 1, A: 1 },
});
});
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