Simulates chromatic aberration to the input texture sampler2D tex.

ChromaticAberration_Fragment.glsl

#version 150
uniform sampler2D tex;

in vec2 f_texCoord;

out vec4 fColor;

vec3 refractiveIndex = vec3(1.03, 1.05, 1.08);

void main(void)
{
    vec2 normalizedTexCoord = 2 * f_texCoord - 1;    // [0, 1] -> [-1, 1]
    vec3 texVec = vec3(normalizedTexCoord, 1.0);
    vec3 normalVec = vec3(0.0, 0.0, -1.0);
    vec3 redRefractionVec = refract(texVec, normalVec, refractiveIndex.r);
    vec3 greenRefractionVec = refract(texVec, normalVec, refractiveIndex.g);
    vec3 blueRefractionVec = refract(texVec, normalVec, refractiveIndex.b);
    vec2 redTexCoord = ((redRefractionVec / redRefractionVec.z).xy + 1) / 2;
    vec2 greenTexCoord = ((greenRefractionVec / greenRefractionVec.z).xy + 1) / 2;
    vec2 blueTexCoord = ((blueRefractionVec / blueRefractionVec.z).xy + 1) / 2;

    fColor = vec4
    (
        texture(tex, redTexCoord).r, 
        texture(tex, greenTexCoord).g, 
        texture(tex, blueTexCoord).b, 
        1.0
    );
}