Latencies of Direct3D 9 API calls
I've recently been looking with PIX for Windows at an application using
Direct3D 9 for rendering. What I've noticed is that the first operations
of a given frame on render targets or textures that wrap them seem to take
a very long time. The system is running Windows 7 and is not out of
graphics memory. No thrashing should thus be happening. What I find
interesting is that operations on 16-bit floating point surfaces take
about double the time as on 8-bit integer surfaces.
Anyone have any explanation for this phenomena?
-Timo
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