utility function to convert GLenum error codes to strings like gluErrorString

gistfile1.c

const char* GLErrorToString(GLenum err)
{
    switch (err)
    {
    case GL_NO_ERROR:                      return "GL_NO_ERROR";
    case GL_INVALID_ENUM:                  return "GL_INVALID_ENUM";
    case GL_INVALID_VALUE:                 return "GL_INVALID_VALUE";
    case GL_INVALID_OPERATION:             return "GL_INVALID_OPERATION";
    case GL_STACK_OVERFLOW:                return "GL_STACK_OVERFLOW";
    case GL_STACK_UNDERFLOW:               return "GL_STACK_UNDERFLOW";
    case GL_OUT_OF_MEMORY:                 return "GL_OUT_OF_MEMORY";
    case 0x8031: /* not core */            return "GL_TABLE_TOO_LARGE_EXT";
    case 0x8065: /* not core */            return "GL_TEXTURE_TOO_LARGE_EXT";
    case GL_INVALID_FRAMEBUFFER_OPERATION: return "GL_INVALID_FRAMEBUFFER_OPERATION";
    default:
        assert(!"Unhandled GL error code");
        return NULL;
    }
}