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import { createCanvasSurface } from "./canvas-utils";
import { effectsRegistry, resolveEffectPasses } from "@/effects";
import { buildDefaultParamValues } from "@/params/registry";
import type { ParamValues } from "@/params";
import { gpuRenderer } from "./gpu-renderer";
const PREVIEW_SIZE = 160;
const PREVIEW_IMAGE_PATH = "/effects/preview.jpg";
class EffectPreviewService {
private testSourceCanvas: OffscreenCanvas | null = null;
private previewImageElement: HTMLImageElement | null = null;
private onReadyCallbacks = new Set<() => void>();
readonly PREVIEW_SIZE = PREVIEW_SIZE;
constructor() {
this.loadPreviewImage();
}
onPreviewImageReady({ callback }: { callback: () => void }): () => void {
this.onReadyCallbacks.add(callback);
return () => this.onReadyCallbacks.delete(callback);
}
renderPreview({
effectType,
params,
targetCanvas,
uniformDimensions,
}: {
effectType: string;
params: ParamValues;
targetCanvas: HTMLCanvasElement;
uniformDimensions?: { width: number; height: number };
}): void {
const size = PREVIEW_SIZE;
const targetCtx = targetCanvas.getContext(
"2d",
) as CanvasRenderingContext2D | null;
if (!targetCtx) {
return;
}
targetCanvas.width = size;
targetCanvas.height = size;
const source = this.getTestSource({ width: size, height: size });
if (!source) {
targetCtx.clearRect(0, 0, size, size);
return;
}
try {
const definition = effectsRegistry.get(effectType);
const resolvedParams =
Object.keys(params).length > 0
? params
: buildDefaultParamValues(definition.params);
const passes = resolveEffectPasses({
definition,
effectParams: resolvedParams,
width: uniformDimensions?.width ?? size,
height: uniformDimensions?.height ?? size,
});
const result = this.applyGpuEffect({
source,
width: size,
height: size,
passes,
});
targetCtx.drawImage(result, 0, 0, size, size);
} catch (error) {
console.warn("Failed to render effect preview", { effectType, error });
targetCtx.clearRect(0, 0, size, size);
targetCtx.drawImage(source, 0, 0, size, size);
}
}
private loadPreviewImage(): void {
if (typeof window === "undefined") return;
const image = new Image();
image.onload = () => {
this.testSourceCanvas = null;
for (const callback of this.onReadyCallbacks) {
callback();
}
};
image.src = PREVIEW_IMAGE_PATH;
this.previewImageElement = image;
}
private createTestSource({
width,
height,
}: {
width: number;
height: number;
}): OffscreenCanvas | null {
const isImageReady =
this.previewImageElement?.complete &&
(this.previewImageElement.naturalWidth ?? 0) > 0;
if (!isImageReady || !this.previewImageElement) {
return null;
}
const { canvas, context } = createCanvasSurface({ width, height });
context.drawImage(this.previewImageElement, 0, 0, width, height);
return canvas;
}
private getTestSource({
width,
height,
}: {
width: number;
height: number;
}): OffscreenCanvas | null {
if (
!this.testSourceCanvas ||
this.testSourceCanvas.width !== width ||
this.testSourceCanvas.height !== height
) {
this.testSourceCanvas = this.createTestSource({ width, height });
}
return this.testSourceCanvas;
}
private applyGpuEffect({
source,
width,
height,
passes,
}: {
source: OffscreenCanvas;
width: number;
height: number;
passes: ReturnType<typeof resolveEffectPasses>;
}): OffscreenCanvas {
return gpuRenderer.applyEffect({
source,
width,
height,
passes,
});
}
}
export const effectPreviewService = new EffectPreviewService();
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