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Re: [Dri-devel] Mach64 native template & PPC fp format
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From: F. <j_r...@ya...> - 2002-07-01 11:03:24
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On Mon, Jul 01, 2002 at 11:37:59AM +0100, Keith Whitwell wrote: >José Fonseca wrote: [...] >> >>Indeed! Here are the results of the 'b' and 'B' benchmark with the >>default settings before: >> >>Benchmarking... >>Result: triangles/sec: 205098 fps: 28.5771 >>Benchmarking... >>Result: triangles/sec: 204282 fps: 28.4634 >> >>and after: >> >>Benchmarking... >>Result: triangles/sec: 277690 fps: 38.6917 >>Benchmarking... >>Result: triangles/sec: 275819 fps: 38.4309 >> >>so the difference isn't that marginal as I thought. > >Indeed. That looks like a pretty good speedup... The Mach64 format is quite different from the D3D. For example the X,Y and Z coordinates are in fixed point and not in floating point. By making all the conversions on the vertex buffer template these operations are factored out in reused vertices. And in the 3D model used in the isosurf demo (a triangular mesh) I would say that every vertex is roughly used about 3-4 times, hence the impact. I also removed an extra fp multiplication for backface culling by using signbit() instead. José Fonseca |