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However, I doubt that there's anything I can use, because the two critical features I need for improving the GF2 path are either doubling the result of the framebuffer blend or another texture stage, both of which are doubtful.

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Let's start with the most powerful cards and work down: You might be wondering why I'm using Direct3D instead of Open GL.The problem is that different drivers and applications are inconsistent about how they treat or format odd-width and odd-height YV12 images.Some support it by truncating the chroma planes (dumb). Now, if people had sense, they would have handled this the way that MPEG and JPEG do, and simply require that the bitmap always be padded to the nearest even boundaries and that the extra pixels be ignored on decoding.NET 2003, but it still isn't able to resolve binary ops of the form push ebp mov ebp,esp pxor xmm0,xmm0 movdqa xmm1,xmm0 movd xmm0,dword ptr [ebp 8] punpcklbw xmm0,xmm1 pshuflw xmm1,xmm0,0FFh pmullw xmm0,xmm1 psrlw xmm0,8 movdqa xmm1,xmm0 packuswb xmm1,xmm0 and esp,0FFFFFFF0h movd eax,xmm1 mov esp,ebp pop ebp ret push ebp mov ebp,esp pxor xmm0,xmm0 movdqa xmm1,xmm0 movd xmm0,dword ptr [ebp 8] punpcklbw xmm0,xmm1 pshuflw xmm1,xmm0,0FFh pmullw xmm0,xmm1 psrlw xmm0,8 movdqa xmm1,xmm0 packuswb xmm1,xmm0 and esp,0FFFFFFF0h movd eax,xmm1 mov esp,ebp pop ebp ret The code is at least correct this time, but it is still full of unnecessary data movement, which consumes decode and execution bandwidth.Now for the real kicker: those extraneous moves hurt on a Pentium 4, because on a P4, a register-to-register MMX/SSE/SSE2 move has a latency of 6 clocks.