A problem to multiple lights

OpenGL
1

I am a beginner.I want to write a shader about multiple lights.
But whenever I use gl_LightSource[2], the frag color turn out to be black. And if I don’t use the shader, I can use the light2.
What the problem is?

2

:o
I find the problem now.
The reason is thar I put the gl_LightSource[2] in the fragment shader. When I put it in vertex shader, the problem will be solved.
So I think we’d better put the light computation in vertex shader.

3

Sounds like a driver bug. Using your own uniforms would be another solution.

4

You are probably using an ATI card with old drivers.

5

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