threepipe/lib/postprocessing/GenericBlendTexturePass.js

A modern 3D viewer framework built on top of three.js, written in TypeScript, designed to make creating high-quality, modular, and extensible 3D experiences on the web simple and enjoyable.

import { CopyShader } from 'three/examples/jsm/shaders/CopyShader.js';
import { ExtendedShaderPass } from './ExtendedShaderPass';
export class GenericBlendTexturePass extends ExtendedShaderPass {
    constructor(uniforms, blendFunc = 'c = a + b;', extraFrag = '', texture, maxIntensity = 120) {
        super({
            vertexShader: CopyShader.vertexShader,
            fragmentShader: `
                varying vec2 vUv;
                ${extraFrag}
                void main() {
                    vec4 a = tDiffuseTexelToLinear ( texture2D( tDiffuse, vUv ) );
                    vec4 b = tDiffuse2TexelToLinear ( texture2D( tDiffuse2, vUv ) );
                    vec4 c = vec4(0);
                    ${blendFunc}
                    c = clamp(c, vec4(0), vec4(MAX_INTENSITY));
                    gl_FragColor = c;
                    #include <colorspace_fragment>
                }
            `,
            uniforms: {
                'tDiffuse': { value: null },
                'tDiffuse2': { value: texture },
                ...uniforms,
            },
            defines: {
                ['MAX_INTENSITY']: maxIntensity,
            },
        }, 'tDiffuse', 'tDiffuse2');
        this.clear = false;
        this.needsSwap = true;
    }
}
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