print opengl errors

OpenGL.cpp

		void PrintOpenGLErrors(c8 const * const Function, c8 const * const File, s32 const Line);

#ifdef _DEBUG
		#define CheckedGLCall(x) do { PrintOpenGLErrors("before "#x, __FILE__, __LINE__); (x); PrintOpenGLErrors(#x, __FILE__, __LINE__); } while (0)
#else
		#define CheckedGLCall(x) (x)
#endif

		void PrintOpenGLErrors(char const * const Function, char const * const File, int const Line)
		{
			bool Succeeded = true;

			GLenum Error = glGetError();
			if (Error != GL_NO_ERROR)
			{
				char const * ErrorString = (char const *) gluErrorString(Error);
				std::cerr << "OpenGL Error in " << File << " at line " << Line << " calling function " << Function << ": " << (ErrorString ? ErrorString : "") << std::endl;
			}
		}