An idea would be to make sure and clear the backbuffer at the beginning of each frame, before you draw anything. Something like this would do it:


DDBLTFX ddbltfx;
ddbltfx.dwSize = sizeof(ddbltfx);
ddbltfx.dwFillColor = 0L;

lpDDSBack->Blt(NULL, NULL, NULL, DDBLT_COLORFILL, &ddbltfx);


That'll be trouble if you're trying to keep all your polygons onscreen, but should work otherwise.

Jonathan

I'm just doing a simple blt and flip with a primary surface and back buffer. I blit a random colored rectangle to the back surface and then flip. The problem I'm having is that every other flip shows parts of my workspace in the background. I'm assuming that I'm not clearing a surface properly, but I've tried everything I've seen on these boards and from the books I have.

I have this before my initial surface creations which are declared with the Caps,complex, and flip flags.
//////////////////////////////////
memset(&ddsd, 0, sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);
/////////////////////////////////
then after the primary surface has been created I zero out the ddsCaps structure the same as above except with (ddsCaps).

Is there something else I have to do to get rid of the garbage?

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Still Learning...

Thanks Jonathon. I'll give it a whirl and see how it goes.