Irrlicht Engine

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video::EGSL_DEFAULT 

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//saturation_vertexShader.vert
 
uniform mat4 matViewProjection;
 
varying vec2 texCoord;
 
void main(void) {
    gl_Position = matViewProjection*gl_Vertex;
    texCoord = gl_MultiTexCoord0.xy;
}

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//saturation_fragmentShader.frag
 
uniform sampler2D TextureSampler;
 
varying vec2 texCoord;
 
void main(void) {
    vec4 Color = texture2D(TextureSampler, texCoord);
    gl_FragColor = clamp((Color - 0.3) / (1.0 - 0.3),0.0,1.0);
}

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//don't use absolute paths
psFileName4 = "saturation_vertexShader.vert";
vsFileName4 = "saturation_fragmentShader.frag";
 
video::IGPUProgrammingServices* gpu = driver->getGPUProgrammingServices();
 
s32 saturation_pass = video::EMT_SOLID;
 
if (gpu)
{
    Saturation_Shader* mc_12 = new Saturation_Shader();
 
    const video::E_GPU_SHADING_LANGUAGE shadingLanguage =
        video::EGSL_CG; video::EGSL_DEFAULT;
 
    saturation_pass = gpu->addHighLevelShaderMaterialFromFiles(
        vsFileName4, "vs_main", video::EVST_VS_1_0,
        psFileName4, "ps_main", video::EPST_PS_1_0,
        mc_12, video::EMT_SOLID, 0, shadingLanguage);
    mc_12->drop();
}