@tolokoban/tgd/lib/dist/filter/anti-aliasing.js

ToloGameDev library for WebGL2

import { TgdFilter } from "./filter.js";
export class TgdFilterAntiAliasing extends TgdFilter {
    constructor(options = {}) {
        const { strength = 1 } = options;
        const ang = Math.atan(1 / 2);
        const radius = Math.sqrt(5) / 4;
        const A = Math.cos(ang) * radius;
        const B = Math.sin(ang) * radius;
        super({
            name: `TgdFilterAntiAliasing/${TgdFilter.id++}`,
            fragmentShaderCode: [
                `float a = ${A.toFixed(9)} * uniStrength;`,
                `float b = ${B.toFixed(9)} * uniStrength;`,
                "vec4 col1 = texture(uniTexture, varUV + vec2(a, b) * varPixel);",
                "vec4 col2 = texture(uniTexture, varUV + vec2(-b, a) * varPixel);",
                "vec4 col3 = texture(uniTexture, varUV + vec2(-a, -b) * varPixel);",
                "vec4 col4 = texture(uniTexture, varUV + vec2(b, -a) * varPixel);",
                `FragColor = 0.25 * (col1 + col2 + col3 + col4);`,
            ],
            uniforms: {
                uniStrength: "float",
            },
            setUniforms: ({ program }) => {
                program.uniform1f("uniStrength", this.strength);
            },
        });
        /**
         * Percentage of displacement of the color or the border of the image.
         * The blue is push await from the center, and the red is pulled to
         * the center. But if you use a negative `strength`, the process is
         * reversed.
         *
         * Default to 1.0 (means 1% of displacement).
         */
        this.strength = 1;
        this.strength = strength;
    }
}
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