invert.fsh
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#version 150
uniform sampler2D InSampler;
in vec2 texCoord;
uniform float InverseAmount;
out vec4 fragColor;
void main(){
vec4 diffuseColor = texture(InSampler, texCoord);
vec4 invertColor = 1.0 - diffuseColor;
vec4 outColor = mix(diffuseColor, invertColor, InverseAmount);
fragColor = vec4(outColor.rgb, 1.0);
}