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GLSL

#version 120
uniform sampler2D DiffuseSampler;
varying vec2 texCoord;
uniform float InverseAmount;
void main(){
vec4 diffuseColor = texture2D(DiffuseSampler, texCoord);
vec4 invertColor = 1.0 - diffuseColor;
vec4 outColor = mix(diffuseColor, invertColor, InverseAmount);
gl_FragColor = vec4(outColor.rgb, diffuseColor.a);
}