playcanvas
Version:
PlayCanvas WebGL game engine
37 lines (34 loc) • 1.2 kB
JavaScript
import { BUFFERUSAGE_INDIRECT, BUFFERUSAGE_COPY_DST } from '../constants.js';
import { StorageBuffer } from '../storage-buffer.js';
class WebgpuDrawCommands {
constructor(device){
this.gpuIndirect = null;
this.gpuIndirectSigned = null;
this.storage = null;
this.device = device;
}
allocate(maxCount) {
this.gpuIndirect = new Uint32Array(5 * maxCount);
this.gpuIndirectSigned = new Int32Array(this.gpuIndirect.buffer);
this.storage = new StorageBuffer(this.device, this.gpuIndirect.byteLength, BUFFERUSAGE_INDIRECT | BUFFERUSAGE_COPY_DST);
}
add(i, indexOrVertexCount, instanceCount, firstIndexOrVertex, baseVertex = 0, firstInstance = 0) {
const o = i * 5;
this.gpuIndirect[o + 0] = indexOrVertexCount;
this.gpuIndirect[o + 1] = instanceCount;
this.gpuIndirect[o + 2] = firstIndexOrVertex;
this.gpuIndirectSigned[o + 3] = baseVertex;
this.gpuIndirect[o + 4] = firstInstance;
}
update(count) {
if (this.storage && count > 0) {
const used = count * 5;
this.storage.write(0, this.gpuIndirect, 0, used);
}
}
destroy() {
this.storage?.destroy();
this.storage = null;
}
}
export { WebgpuDrawCommands };