I''m trying to write a program that let''s me animate 2d transforms of bitmaps. My basic strategy is to load the pixel colors of the bitmap into a lookup table and then to render each frame by locking the back surface, set the color value for each pixel, and flip the front and back surfaces. Here''s the heart of the program: void RenderFrame() { unsigned uColor; DDSURFACEDESC description; ZeroMemory(&description, sizeof(DDSURFACEDESC)); description.dwSize = sizeof(DDSURFACEDESC); g_pDDSBack->Lock(NULL, &description, DDLOCK_WAIT, NULL); unsigned char *pSurfaceBits = (unsigned char*) description.lpSurface; for (int i = 0; i < 640; i ++) { for (int j = 0; j < 480; j ++) { uColor = GetTransformValue(i, j); memcpy(pSurfaceBits + i * 4 + j * description.lPitch, &uColor, 4); } } g_pDDSBack->Unlock(NULL); DDFlip(); } Basically, my problem is that this is too slow. I''m getting about 5 fps on a pretty fast machine and I''m just using an identity transform so there''s no extra math. How can I optimize this? Blitting each pixel individually instead of a lock only slows things down. I don''t know what else to try. Thanks in advance. Kevin

Actually, I am trying to write to it. Not read from it.

It doesn''t matter, system memory doesn''t have the disadvantage of trying to work through a bus. Do all CPU stuff (your code) in system memory. Do all video card stuff (Blt, BltFast, et cetera) in video memory if possible.

Null and Void
It is an inexperienced programmer who speaks of the length of his works.
It is an experienced one who speaks of the briefness.
http://www.crosswinds.net/~druidgames/

By bus I meant a slower bus. Also, I fixed my signature (I changed servers, heh).

Null and Void
It is an inexperienced programmer who speaks of the length of his works.
It is an experienced one who speaks of the briefness.
http://www.gdarchive.net/druidgames/