View Full Version : double-buffering with buffer_region extension

07-28-2004, 07:20 AM
I'm a bit unclear on the use of wglCreateBufferRegion with double buffering. It works the way I expect when I stick to the front buffer, but it doesn't work when I try to save/restore the contents of the back buffer.

This works:
1) CreateBufferRegion with WGL_FRONT_COLOR_BUFFER_BIT_ARB
2) Draw the scene to the back buffer, swap buffers, and then SaveBufferRegion
3) RestoreBufferRegion brings back my scene

This doesn't work:
1)CreateBufferRegion with WGL_BACK_COLOR_BUFFER_BIT_ARB
2) Draw my scene to the back buffer and then, without swapping buffers call SaveBufferRegion.
3) Call RestoreBufferRegion and then swap buffers. Scene doesn't update.

If a region was created for the back buffer, shouldn't restore put it back into the back buffer?