The geometry processor performs the vertex processing tasks shown in Table: Vertex Processing Tasks Performed by the Geometry Processor.
Table 5-1: Vertex Processing Tasks Performed by the Geometry Processor
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Processing Task
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Description
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Transform and lighting
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The geometry processor scales, rotates, and positions the geometry of objects in the scene, and also calculates and assigns values to the vertices.
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Primitive assembly
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The PLB links vertices together to form different primitives.
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Culling
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This step discards polygons that must not be rendered.
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Primitive list assembly
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The pixel processor is a tile-based renderer. The geometry processor prepares a list of all primitives required for the pixel processor to render. For each primitive, the PLB writes a list entry for each tile that the primitive touches.
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Rendering
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Describes the various tasks the pixel processor performs. During rendering, the pixel processor uses the information from the polygon list to produce a final frame buffer image.
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