void GL_CheckError()
{
	GLenum err;
	char str[64];

	for( int i = 0; i < 10; i++ )
	{
		if( ( err = glGetError() ) != GL_NO_ERROR )
		{
			switch( err )
			{
				case GL_INVALID_ENUM:
					strcpy( str, "GL_INVALID_ENUM" );
					break;
				case GL_INVALID_VALUE:
					strcpy( str, "GL_INVALID_VALUE" );
					break;
				case GL_INVALID_OPERATION:
					strcpy( str, "GL_INVALID_OPERATION" );
					break;
				case GL_STACK_OVERFLOW:
					strcpy( str, "GL_STACK_OVERFLOW" );
					break;
				case GL_STACK_UNDERFLOW:
					strcpy( str, "GL_STACK_UNDERFLOW" );
					break;
				case GL_OUT_OF_MEMORY:
					strcpy( str, "GL_OUT_OF_MEMORY" );
					break;
				case GL_INVALID_FRAMEBUFFER_OPERATION:
					strcpy( str, "GL_INVALID_FRAMEBUFFER_OPERATION" );
					break;
				default: break;
			}
			printf( "GL error %s %#x\n", str, err );
		}
	}
}