Parhelia has a vertex shader unit whose T&L subsystem consists of four individual shaders. Combined with a 512-unit instruction cache, 256 constant registers and optimized control, the Parhelia-512 reaches a very high vertex throughput.
The vertex shaders correspond to Microsoft's DirectX 9 (v2.0). The hardware displacement mapping engine is connected directly to the vertex shader unit, via the vertex fetcher and cache. Refer to the diagram here .
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