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GLSL fixed function fragment program replacement

You might be interested in having a look at ShaderGen. From the description: ShaderGen is a program that can automatically produce shaders that mimic the results of a set of fixed function state. This tool was used to verify the fixed function shader code that is described in Chapter 9. By the way, you will … Read more

How does the calculation of the light model work in a shader program?

Lambertian reflectance model To model the reflection of light in computer graphics is used a Bidirectional reflectance distribution function (BRDF). BRDF is a function that gives the relation between the light reflected along an outgoing direction and the light incident from an incoming direction. A perfect diffuse surface has a BRDF that has the same … Read more