Silicon Graphics Inc. Graphics Workstation

Geometry Engine & Triangle Bus

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• Geometry Engines

• Intel i860XP,50MHz,100Mflops
• 2 Mbytes of combined code/data DRAM, 1 AS/C
• Code programming

>> Code is first developed in C, cross compiled for i860XP

>> Code that is executed frequently is then re-coded in i860XP assembly code.

• Treat each parameter as a plane equation, compute signed slope in the positive X and Y screen directions.
• Decompose all polygon to triangles

• Triangle Bus

-Handle over 1 million triangles

-Broadcast rasterization data, point, line segment, texture images.