Ported all the post processing regl passes to WebGPU. Fixed the CORS stuff in loadTexture. Renamed createRenderTargetTexture to makePassFBO, to conform with the regl project. Added make1DTexture, which stripePass uses.

js/webgpu/imagePass.js

@@ -0,0 +1,94 @@
+import std140 from "./std140.js";
+import { loadTexture, loadShaderModule, makeUniformBuffer, makePassFBO, makePass } from "./utils.js";
+
+// Multiplies the rendered rain and bloom by a loaded in image
+
+const defaultBGURL = "https://upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Flammarion_Colored.jpg/917px-Flammarion_Colored.jpg";
+const numVerticesPerQuad = 2 * 3;
+
+export default (context, getInputs) => {
+	const { config, adapter, device, canvasContext } = context;
+	const ditherMagnitude = 0.05;
+
+	const configLayout = std140(["f32", "vec3<f32>"]);
+	const configBuffer = makeUniformBuffer(device, configLayout, [ditherMagnitude, config.backgroundColor]);
+
+	const linearSampler = device.createSampler({
+		magFilter: "linear",
+		minFilter: "linear",
+	});
+
+	const renderPassConfig = {
+		colorAttachments: [
+			{
+				view: null,
+				loadValue: { r: 0, g: 0, b: 0, a: 1 },
+				storeOp: "store",
+			},
+		],
+	};
+
+	const presentationFormat = canvasContext.getPreferredFormat(adapter);
+
+	let renderPipeline;
+	let output;
+	let backgroundTex;
+
+	const bgURL = "bgURL" in config ? config.bgURL : defaultBGURL;
+	const assets = [loadTexture(device, bgURL), loadShaderModule(device, "shaders/wgsl/imagePass.wgsl")];
+
+	const ready = (async () => {
+		const [bgTex, rainShader] = await Promise.all(assets);
+
+		backgroundTex = bgTex;
+
+		renderPipeline = device.createRenderPipeline({
+			vertex: {
+				module: rainShader,
+				entryPoint: "vertMain",
+			},
+			fragment: {
+				module: rainShader,
+				entryPoint: "fragMain",
+				targets: [
+					{
+						format: presentationFormat,
+					},
+				],
+			},
+		});
+	})();
+
+	const setSize = (width, height) => {
+		output?.destroy();
+		output = makePassFBO(device, width, height, presentationFormat);
+	};
+
+	const getOutputs = () => ({
+		primary: output,
+	});
+
+	const execute = (encoder) => {
+		const inputs = getInputs();
+		const tex = inputs.primary;
+		const bloomTex = inputs.primary; // TODO: bloom
+		const renderBindGroup = device.createBindGroup({
+			layout: renderPipeline.getBindGroupLayout(0),
+			entries: [linearSampler, tex.createView(), bloomTex.createView(), backgroundTex.createView()]
+				.map((resource) => (resource instanceof GPUBuffer ? { buffer: resource } : resource))
+				.map((resource, binding) => ({
+					binding,
+					resource,
+				})),
+		});
+
+		renderPassConfig.colorAttachments[0].view = output.createView();
+		const renderPass = encoder.beginRenderPass(renderPassConfig);
+		renderPass.setPipeline(renderPipeline);
+		renderPass.setBindGroup(0, renderBindGroup);
+		renderPass.draw(numVerticesPerQuad, 1, 0, 0);
+		renderPass.endPass();
+	};
+
+	return makePass(ready, setSize, getOutputs, execute);
+};