126 lines
3 KiB
TypeScript
126 lines
3 KiB
TypeScript
import { setUpFullScreenQuad } from '../../utils/full-screen-quad';
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import shader from './swipe.wgsl';
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import { vec2 } from 'gl-matrix';
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export class SwipePipeline {
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private static readonly UNIFORM_COUNT = 8;
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private readonly pipeline: GPURenderPipeline;
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private readonly uniforms: GPUBuffer;
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private readonly quadVertexBuffer: GPUBuffer;
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private bindGroup?: GPUBindGroup;
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private previousTrailMapIn?: GPUTexture;
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public constructor(private readonly device: GPUDevice) {
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const { buffer, vertex } = setUpFullScreenQuad(device);
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this.quadVertexBuffer = buffer;
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this.pipeline = device.createRenderPipeline({
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layout: 'auto',
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vertex,
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fragment: {
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module: device.createShaderModule({
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code: shader,
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}),
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entryPoint: 'fragment',
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targets: [
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{
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format: 'rgba16float',
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},
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],
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},
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primitive: {
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topology: 'triangle-strip',
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},
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});
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this.uniforms = this.device.createBuffer({
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size: SwipePipeline.UNIFORM_COUNT * Float32Array.BYTES_PER_ELEMENT,
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usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST,
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});
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}
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public setParameters({
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width,
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height,
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isSwipeActive,
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swipe,
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swipeRadius,
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}: {
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width: number;
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height: number;
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isSwipeActive: boolean;
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swipe: vec2;
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swipeRadius: number;
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}) {
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this.device.queue.writeBuffer(
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this.uniforms,
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0,
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new Float32Array([
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width,
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height,
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swipe ? swipe[0] : 0,
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swipe ? swipe[1] : 0,
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swipeRadius,
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isSwipeActive ? 1 : 0,
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])
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);
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}
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public execute(
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commandEncoder: GPUCommandEncoder,
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trailMapIn: GPUTexture,
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trailMapOut: GPUTexture
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) {
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this.ensureBindGroupExists(trailMapIn);
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const renderPassDescriptor: GPURenderPassDescriptor = {
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colorAttachments: [
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{
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view: trailMapOut.createView(),
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clearValue: { r: 1.0, g: 1.0, b: 1.0, a: 1.0 },
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loadOp: 'clear',
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storeOp: 'store',
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},
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],
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};
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const passEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);
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passEncoder.setPipeline(this.pipeline);
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passEncoder.setVertexBuffer(0, this.quadVertexBuffer);
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passEncoder.setBindGroup(0, this.bindGroup);
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passEncoder.draw(4, 1);
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passEncoder.end();
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}
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private ensureBindGroupExists(trailMapIn: GPUTexture) {
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if (this.previousTrailMapIn !== trailMapIn) {
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this.bindGroup = this.device.createBindGroup({
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layout: this.pipeline.getBindGroupLayout(0),
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entries: [
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{
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binding: 0,
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resource: {
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buffer: this.uniforms,
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},
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},
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{
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binding: 1,
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resource: this.device.createSampler({
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magFilter: 'linear',
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minFilter: 'linear',
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}),
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},
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{
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binding: 2,
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resource: trailMapIn.createView(),
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},
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],
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});
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this.previousTrailMapIn = trailMapIn;
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}
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}
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}
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