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glslDevil won't debug shader code

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Hey guys, I recently happened upon glslDevil and it is awesome. The only problem I'm having is that it won't let me step through my shader code. When a glUseProgram function is called, it displays the shader source code, but I can't step through it. Has anyone who uses glslDevil had this problem?

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What GPU do you have?

From the glslDevil FAQ (which is here).

Vertex shader debugging is disabled. Why?
To debug vertex shaders your graphics hardware needs to support the NV_transform_feedback extension. This is currently supported for example on NVIDIA G80 based cards.

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