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Use drawIndirect instead of draw in particles sample #471

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Use drawIndirect instead of draw in particles sample #471

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15 changes: 14 additions & 1 deletion sample/particles/main.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -398,6 +398,11 @@ const computeBindGroup = device.createBindGroup({
],
});

const drawBuffer = device.createBuffer({
size: 16,
usage: GPUBufferUsage.INDIRECT | GPUBufferUsage.COPY_DST,
});

const aspect = canvas.width / canvas.height;
const projection = mat4.perspective((2 * Math.PI) / 5, aspect, 1, 100.0);
const view = mat4.create();
Expand Down Expand Up @@ -456,13 +461,21 @@ function frame() {
passEncoder.dispatchWorkgroups(Math.ceil(numParticles / 64));
passEncoder.end();
}
device.queue.writeBuffer(
drawBuffer,
0,
new Uint32Array([
6, // vertex count
numParticles, // instance count
])
);
{
const passEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);
passEncoder.setPipeline(renderPipeline);
passEncoder.setBindGroup(0, uniformBindGroup);
passEncoder.setVertexBuffer(0, particlesBuffer);
passEncoder.setVertexBuffer(1, quadVertexBuffer);
passEncoder.draw(6, numParticles, 0, 0);
passEncoder.drawIndirect(drawBuffer, 0);
passEncoder.end();
}

Expand Down