D3dswapeffect_copy

Just a side note to all those attempting to directly access the back buffer in D3D. Make sure you have your swap effect set to D3DSWAPPEFFECT_COPY or you will get a very annoying flicker.

Also make sure that you specify your back buffer is a lockable one in your D3DPRESENT_PARAMETERS structure.

Since you are only locking the buffer once per frame, you shouldn't notice too much of a hit. You should not need to unlock the buffer until you are done with the entire scene.

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Originally Posted by Bubba

Just a side note to all those attempting to directly access the back buffer in D3D. Make sure you have your swap effect set to D3DSWAPPEFFECT_COPY or you will get a very annoying flicker.

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Isn't that because D3DSWAPEFFECT_FLIP switches the primary and back surfaces so that the primary surface becomes the back surface and vice versa. That would explain the flicker -- you're only drawing something on the screen every other frame, half of the frames would be black or something.

This is just a guess, I haven't tried anything.