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Ways of passing information to a Shader

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Hi, I have a shader that needs to know some additional information about a vertex than just its position. And I was wondering what other ways there are of passing information to a shader. Here's what I thought I was going to do: <Vertex Shader> if(gl_Vertex.w == 0.0) doSomething; else if(gl_Vertex.w == 1.0) doSomethingElse; else if(gl_Vertex.w == 2.0) doSomethingElse; But I found that that doesn't work. Because the w component actually does have meaning. (Which I didn't know). So what other ways are there of passing this information to my shader? Thanks a lot -Patrick

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