Comments about Opengl extenions :
- If the graphic card is not made by NVIDIA, Vbo and Shader are desactivated by default.
- If Vertex Buffer Object (VBO) (OpenGL 1.4) extension is not used, GLC_Player use Vertex Array (OpenGL 1.1).
- If OpenGL Shading Language (GLSL) (OpenGL 2.0) extension is not used, GLC_Player's shaders are desactivated.
- If Frame Buffer Object extension is not used, screenshot quality will be degaded.
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