main_pass {
    wrap_s = clamp_to_edge;
    wrap_t = clamp_to_edge;
    internal_format = rgba;
    source_type = unsigned_int;
    source_format = rgba;
}

uniform_float uGamma {
    default = 1.0;
    step = 0.01;
    min = 0.0;
    max = 5.0;
    description = "gamma level";
}

uniform_float uContrast {
    default = 1.0;
    step = 0.01;
    min = 0.0;
    max = 5.0;
    description = "constrast level";
}

fragment main {

    omw_In vec2 omw_TexCoord;

    void main()
    {
        vec4 color = omw_GetLastShader(omw_TexCoord);
        color.rgb = (color.rgb - vec3(0.5)) * uContrast + 0.5;
        color.rgb = pow(color.rgb, vec3(1.0 / uGamma));

        omw_FragColor = color;
    }
}

technique {
    description = "Main pass.";
    version = "1.0";
    author = "OpenMW";
    passes = main;
    hdr = false;
}