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OverlayBlend

by Mewatools

Blends 2 images using the overlay blend method.

Source Code

// Brief: Blends 2 images using overlay blend method

shaderSource = "
    vec3 blend(vec3 a, vec3 b) {
        float threashold = 0.5;
        float light = (a.x + a.y + a.z) / 3.0;
        if( light < threashold ){
            return 2. * a * b;
        }
        return 1. - 2.*(1.-a)*(1. - b);
    }
    
    void mainImage( out vec4 fragColor, in vec2 fragCoordA, in vec2 fragCoordB ){	
	    vec3  a = texture2D(iChannel0, fragCoordA).rgb;
        vec3  b = texture2D(iChannel1, fragCoordB).rgb;   
        fragColor = vec4( blend(a,b), 1.0 );
    }";
    

node = addShaderNode("OverlayBlend", shaderSource);
node.setRenderArea( "iChannel0+iChannel1" );