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import type { CanvasRenderer } from "../canvas-renderer";
import { getEffect } from "@/lib/effects";
import type { EffectParamValues } from "@/types/effects";
import { BaseNode } from "./base-node";
import { webglEffectRenderer } from "../webgl-effect-renderer";
const TIME_EPSILON = 1e-6;
export type EffectLayerNodeParams = {
effectType: string;
effectParams: EffectParamValues;
timeOffset: number;
duration: number;
};
function isInRange({
time,
timeOffset,
duration,
}: {
time: number;
timeOffset: number;
duration: number;
}): boolean {
return (
time >= timeOffset - TIME_EPSILON &&
time < timeOffset + duration + TIME_EPSILON
);
}
// snapshots whatever is currently on the canvas, applies the effect, draws it back
export class EffectLayerNode extends BaseNode<EffectLayerNodeParams> {
async render({
renderer,
time,
}: {
renderer: CanvasRenderer;
time: number;
}): Promise<void> {
if (
!isInRange({
time,
timeOffset: this.params.timeOffset,
duration: this.params.duration,
})
) {
return;
}
const source = renderer.context.canvas as CanvasImageSource;
const effectDefinition = getEffect({
effectType: this.params.effectType,
});
const passes = effectDefinition.renderer.passes.map((pass) => ({
fragmentShader: pass.fragmentShader,
uniforms: pass.uniforms({
effectParams: this.params.effectParams,
width: renderer.width,
height: renderer.height,
}),
}));
const effectResult = webglEffectRenderer.applyEffect({
source,
width: renderer.width,
height: renderer.height,
passes,
});
renderer.context.save();
renderer.context.clearRect(0, 0, renderer.width, renderer.height);
renderer.context.drawImage(
effectResult,
0,
0,
renderer.width,
renderer.height,
);
renderer.context.restore();
}
}
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