Dx11 Present hook spikes GPU usage

[lmoe]

Dx11 Present hook spikes GPU usage

[lmoe]

So. I have some results. I've learned a big lession today. Don't use cheap Dx11 demos for hook performance tests. It turns out that the demo is calling Present ~8000 times per second. As the detour places a jmp, and my hook jmp's back into the original Present function, it's safe to estimate ~24000 calls per second just for the render function alone. I've also assumed that this overhead would just put load on the CPU, because the real Present function still only gets called 8000 times like before. Well that a mistake as well.

I've just tested a real demanding game to verify, and it turns out that neither Detours 4, nor Minhook had any considerable impact at all. Who would have guessed. However, Detours seemed to handle the load/overhead a bit better than Minhook as the GPU load was ~10% less.

Sigh. Talking about fundamentals. It was basically right in front of my eyes.
Maybe this is a lession for someone else too.