GL_NORMALIZE and is it needed with GLSL

OpenGL
1

Do I need to call GL_NORMALIZE when calling glScale still with GLSL? Or when vec3 normal = normalize(gl_NormalMatrix * gl_Normal); is called does that solve that issue?
Thanks

2

GL_NORMALIZE doesn’t work with shaders. If you use shaders, you have to normalize yourself.

3

Ok got it. So what functions from FFP are left that you need to use with GLSL?
Alpha testing doesn’t work with shaders correct??
What about blending?

4

Both alpha testing and blending still work when using shaders, they’ll both get done after the pixel shader.

5

Go read the spec (3.11.2 Shader Execution). It explicitly tells you which parts of the fixed function pipeline are disabled when you have a fragment shader bound.

6

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