Testing GLEW_ARB_texture_gather is not sufficient in this case. We need to test if GL_ARB_texture_gather is defined in the shader, which is always true on some NVIDIA drivers who does not support it... So trying to make everything work.
Testing GLEW_ARB_texture_gather is not sufficient in this case. We need to test if GL_ARB_texture_gather is defined in the shader, which is always true on some NVIDIA drivers who does not support it... So trying to make everything work.