@motion-core/motion-gpu/dist/core/render-graph.js

Framework-agnostic WebGPU runtime for fullscreen WGSL shaders with explicit Svelte, React, and Vue adapter entrypoints.

//#region src/lib/core/render-graph.ts
/**
* Creates a copy of RGBA clear color.
*/
function cloneClearColor(color) {
	return [
		color[0],
		color[1],
		color[2],
		color[3]
	];
}
/**
* Builds validated render graph plan from runtime pass list.
*
* @param passes - Runtime passes.
* @param defaultClearColor - Global clear color fallback.
* @returns Resolved render graph plan.
*/
function planRenderGraph(passes, defaultClearColor, renderTargetSlots) {
	const steps = [];
	const computeSteps = [];
	const renderSteps = [];
	const declaredTargets = new Set(renderTargetSlots ?? []);
	const availableSlots = new Set(["source"]);
	let finalOutput = "canvas";
	let enabledIndex = 0;
	for (const pass of passes ?? []) {
		if (pass.enabled === false) continue;
		if ("isCompute" in pass && pass.isCompute === true) {
			const step = {
				kind: "compute",
				pass,
				input: "source",
				output: "source",
				needsSwap: false,
				clear: false,
				clearColor: cloneClearColor(defaultClearColor),
				preserve: true
			};
			steps.push(step);
			computeSteps.push(step);
			continue;
		}
		const rp = pass;
		const needsSwap = rp.needsSwap ?? true;
		const input = rp.input ?? "source";
		const output = rp.output ?? (needsSwap ? "target" : "source");
		if (input === "canvas") throw new Error(`Render pass #${enabledIndex} cannot read from "canvas".`);
		if (input !== "source" && input !== "target" && !declaredTargets.has(input)) throw new Error(`Render pass #${enabledIndex} reads unknown target "${input}".`);
		if (output !== "source" && output !== "target" && output !== "canvas" && !declaredTargets.has(output)) throw new Error(`Render pass #${enabledIndex} writes unknown target "${output}".`);
		if (needsSwap && (input !== "source" || output !== "target")) throw new Error(`Render pass #${enabledIndex} uses needsSwap=true but does not follow source->target flow.`);
		if (!availableSlots.has(input)) throw new Error(`Render pass #${enabledIndex} reads "${input}" before it is written.`);
		const step = {
			kind: "render",
			pass,
			input,
			output,
			needsSwap,
			clear: rp.clear ?? false,
			clearColor: cloneClearColor(rp.clearColor ?? defaultClearColor),
			preserve: rp.preserve ?? true
		};
		steps.push(step);
		renderSteps.push(step);
		if (needsSwap) {
			availableSlots.add("target");
			availableSlots.add("source");
			finalOutput = "source";
		} else {
			if (output !== "canvas") availableSlots.add(output);
			finalOutput = output;
		}
		enabledIndex += 1;
	}
	return {
		steps,
		computeSteps,
		renderSteps,
		finalOutput
	};
}
//#endregion
export { planRenderGraph };

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