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Optimizing Pixomatic For Modern x86 Processors: Part II

By Michael Abrash, September 01, 2004

Michael discusses his greatest performance challenge ever-optimizing an x86 3D software rasterizer.
September, 2004: Optimizing Pixomatic For Modern x86 Processors: Part II

EAX Scratch register
EBX Z-buffer pixel address
ECX Loop counter
EDX Texture 0 pointer
ESI Span-list pointer
EDI Pixel-buffer pixel address
EBP Texture 1 pointer
ESP 1/z
MM0 Texture 0 coordinates (u0, v0)
MM1 Texture 1 coordinates (u1, v1)
MM2 Gouraud color
MM3 Specular color
MM4-MM7 Scratch registers

Table 1: Pixel pipeline register allocation.



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