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Old 09 September 2018, 22:15   #1
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Do I need WaitBlit before releasing image buffers?

I want to use BltBitMapRastPort() or BltMaskBitMapRastPort() and when these functions return I would like to release the bitmap plane buffers (the planar image) as soon as possible without wasting time.

Do I need to call WaitBlit() before using FreeMem() or is it guaranteed that the blitting is already finished when these two functions return?
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Old 09 September 2018, 22:33   #2
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I would imagine you would need to call WaitBlit() because the allocation scheme would have no knowledge of custom chip usage and could end up with a race condition between the blitter and CPU.
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Old 09 September 2018, 22:48   #3
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Yes, the RKM says:
"The graphics library rendering and data movement routines generally wait to get access to the blitter, start their blit, and then exit without waiting for the blit to finish. Therefore, you must WaitBlit() after a graphics rendering or data movement call if you intend to immediately deallocate, examine, or perform order-dependent processor operations on the memory used in the call."
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Old 09 September 2018, 23:22   #4
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Many thanks, that's exactly what I wanted to know. So I better keep the WaitBlit() in my code.
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