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import {
getCompositorCanvas,
getLastFrameProfile,
initCompositor,
releaseTexture,
renderFrame,
resizeCompositor,
uploadTexture,
} from "opencut-wasm";
import {
incrementCounter,
isRenderPerfEnabled,
recordWasmFrameProfile,
} from "@/diagnostics/render-perf";
import type {
ExternalTextureDescriptor,
FrameDescriptor,
RenderedTextureDescriptor,
TextureUploadDescriptor,
} from "./types";
/**
* One slot in the derived-texture cache. The OffscreenCanvas is persistent —
* we reuse and redraw into it across frames, which is the change that takes
* the WebGL upload path off the per-frame critical path for static content.
*/
type RenderedCacheEntry = {
kind: "rendered";
canvas: OffscreenCanvas;
contentHash: string;
width: number;
height: number;
};
type ExternalCacheEntry = {
kind: "external";
source: CanvasImageSource;
width: number;
height: number;
};
class WasmCompositor {
private canvas: HTMLCanvasElement | null = null;
private initializedSize: { width: number; height: number } | null = null;
private cache = new Map<string, RenderedCacheEntry | ExternalCacheEntry>();
ensureInitialized({ width, height }: { width: number; height: number }) {
if (!this.canvas) {
initCompositor(width, height);
this.canvas = getCompositorCanvas();
this.initializedSize = { width, height };
return;
}
if (
!this.initializedSize ||
this.initializedSize.width !== width ||
this.initializedSize.height !== height
) {
resizeCompositor(width, height);
this.initializedSize = { width, height };
}
}
getCanvas(): HTMLCanvasElement {
if (!this.canvas) {
throw new Error("Compositor is not initialized");
}
return this.canvas;
}
syncTextures(textures: TextureUploadDescriptor[]) {
const nextIds = new Set(textures.map((texture) => texture.id));
for (const previousId of this.cache.keys()) {
if (!nextIds.has(previousId)) {
releaseTexture(previousId);
this.cache.delete(previousId);
}
}
for (const texture of textures) {
if (texture.kind === "external") {
this.syncExternalTexture(texture);
} else {
this.syncRenderedTexture(texture);
}
}
}
render(frame: FrameDescriptor) {
renderFrame(frame);
if (isRenderPerfEnabled()) {
recordWasmFrameProfile(
getLastFrameProfile() as Array<{ name: string; durationMs: number }>,
);
}
}
private syncExternalTexture(texture: ExternalTextureDescriptor) {
const previous = this.cache.get(texture.id);
if (
previous?.kind === "external" &&
previous.source === texture.source &&
previous.width === texture.width &&
previous.height === texture.height
) {
incrementCounter({ name: "textureCacheHit" });
return;
}
incrementCounter({ name: "textureUpload" });
incrementCounter({
name: "textureUploadPixels",
by: texture.width * texture.height,
});
uploadTexture({
id: texture.id,
source: ensureOffscreenCanvas({
source: texture.source,
width: texture.width,
height: texture.height,
label: `texture upload ${texture.id}`,
}),
width: texture.width,
height: texture.height,
});
this.cache.set(texture.id, {
kind: "external",
source: texture.source,
width: texture.width,
height: texture.height,
});
}
private syncRenderedTexture(texture: RenderedTextureDescriptor) {
const previous = this.cache.get(texture.id);
if (
previous?.kind === "rendered" &&
previous.contentHash === texture.contentHash &&
previous.width === texture.width &&
previous.height === texture.height
) {
incrementCounter({ name: "textureCacheHit" });
return;
}
const canvas =
previous?.kind === "rendered" &&
previous.width === texture.width &&
previous.height === texture.height
? previous.canvas
: createBackingCanvas({
width: texture.width,
height: texture.height,
});
const ctx = canvas.getContext("2d");
if (!ctx) {
throw new Error(`Failed to get 2d context for texture ${texture.id}`);
}
ctx.clearRect(0, 0, texture.width, texture.height);
texture.draw(ctx);
incrementCounter({ name: "textureUpload" });
incrementCounter({
name: "textureUploadPixels",
by: texture.width * texture.height,
});
uploadTexture({
id: texture.id,
source: canvas,
width: texture.width,
height: texture.height,
});
this.cache.set(texture.id, {
kind: "rendered",
canvas,
contentHash: texture.contentHash,
width: texture.width,
height: texture.height,
});
}
}
export const wasmCompositor = new WasmCompositor();
function createBackingCanvas({
width,
height,
}: {
width: number;
height: number;
}): OffscreenCanvas {
if (typeof OffscreenCanvas === "undefined") {
throw new Error("OffscreenCanvas is not supported in this environment");
}
return new OffscreenCanvas(width, height);
}
function ensureOffscreenCanvas({
source,
width,
height,
label,
}: {
source: CanvasImageSource;
width: number;
height: number;
label: string;
}): OffscreenCanvas {
if (source instanceof OffscreenCanvas) {
return source;
}
if (typeof OffscreenCanvas === "undefined") {
throw new Error(`OffscreenCanvas is required for ${label}`);
}
const canvas = new OffscreenCanvas(width, height);
const context = canvas.getContext("2d");
if (!context) {
throw new Error(`Failed to get 2d context for ${label}`);
}
context.clearRect(0, 0, width, height);
context.drawImage(source, 0, 0, width, height);
return canvas;
}
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