| WGL_I3D_swap_frame_usage | |
| http://oss.sgi.com/projects/ogl-sample/registry/I3D/wgl_swap_frame_usage.txt | |
| BOOL wglBeginFrameTrackingI3D (void) | |
| BOOL wglEndFrameTrackingI3D (void) | |
| BOOL wglGetFrameUsageI3D (float* pUsage) | |
| BOOL wglQueryFrameTrackingI3D (DWORD* pFrameCount, DWORD *pMissedFrames, float *pLastMissedUsage) |