@tolokoban/tgd/lib/dist/filter/zoom.js

ToloGameDev library for WebGL2

import { TgdVec2 } from "../math/index.js";
import { TgdFilter } from "./filter.js";
export class TgdFilterZoom extends TgdFilter {
    constructor({ zoom = 1 } = {}) {
        super({
            name: `TgdFilterZoom/${TgdFilter.id++}`,
            fragmentShaderCode: [
                "vec2 uv = (varUV - vec2(0.5)) * uniZoom + uniTranslation + vec2(0.5);",
                "vec4 color = texture(uniTexture, uv);",
                "FragColor = color;",
            ],
            uniforms: {
                uniZoom: "float",
                uniTranslation: "vec2",
            },
        });
        this.zoom = 1;
        this.setUniforms = ({ program }) => {
            program.uniform1f("uniZoom", 1 / this.zoom);
            program.uniform2fv("uniTranslation", this.translation);
        };
        this.zoom = zoom;
        this.translation = new TgdVec2();
    }
}
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