cables_dev/cables/src/core/cgl/cgl_shader_lib.js

import { Uniform } from "./cgl_shader_uniform.js";
import { Texture } from "./cgl_texture.js";
import { TextureEffect } from "./cgl_textureeffect.js";

const ShaderLibMods = {
    "CGL.BLENDMODES": function ()
    {
        this.name = "blendmodes";
        this.srcHeadFrag = TextureEffect.getBlendCode();
    },
    "CGL.BLENDMODES3": function ()
    {
        this.name = "blendmodes3";
        this.srcHeadFrag = TextureEffect.getBlendCode(3);
    },

    "CGL.LUMINANCE": function ()
    {
        this.name = "luminance";
        this.srcHeadFrag = "".endl()
            + "float cgl_luminance(vec3 c)".endl()
            + "{".endl()
            + "    return dot(vec3(0.2126,0.7152,0.0722),c);".endl()
            + "}".endl();
    },


    // quite good random numbers, but somehow don't work in ANGLE
    "CGL.RANDOM_OLD": function ()
    {
        this.name = "randomNumber";
        this.srcHeadFrag = "".endl()
            + "float cgl_random(vec2 co)".endl()
            + "{".endl()
            + "    return fract(sin(dot(co.xy ,vec2(12.9898,4.1414))) * 432758.5453);".endl()
            + "}".endl()
            + "vec3 cgl_random3(vec2 co)".endl()
            + "{".endl()
            + "    return vec3( cgl_random(co),cgl_random(co+0.5711),cgl_random(co+1.5711));".endl()
            + "}";
    },


    // low quality generative ranodm numbers
    "CGL.RANDOM_LOW": function ()
    {
        this.name = "randomNumber";
        this.srcHeadFrag = "".endl()
            + "float cgl_random(vec2 co)".endl()
            + "{".endl()
            + "    return fract(sin(dot(co.xy ,vec2(12.9898,4.1414))) * 358.5453);".endl()
            + "}".endl()
            + "vec3 cgl_random3(vec2 co)".endl()
            + "{".endl()
            + "    return vec3( cgl_random(co),cgl_random(co+0.5711),cgl_random(co+1.5711));".endl()
            + "}";
    },

    // texture based random numbers
    "CGL.RANDOM_TEX": function ()
    {
        this.name = "randomNumbertex";
        this.srcHeadFrag = "".endl()
            + "UNI sampler2D CGLRNDTEX;".endl()
            + "float cgl_random(vec2 co)".endl()
            + "{".endl()
            + "    return texture(CGLRNDTEX,co*5711.0).r;".endl()
            + "}".endl()
            + "vec3 cgl_random3(vec2 co)".endl()
            + "{".endl()
            + "    return texture(CGLRNDTEX,co*5711.0).rgb;".endl()
            + "}";

        this.initUniforms = function (shader)
        {
            return [new Uniform(shader, "t", "CGLRNDTEX", 7)];
        };

        this.onBind = function (cgl, shader)
        {
            Texture.getRandomTexture(cgl);
            cgl.setTexture(7, Texture.getRandomTexture(cgl).tex);
        };
    },
};

export { ShaderLibMods };