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gSPPerspNormalize
Format#include "gbi.h" gSPPerspNormalize(Gfx *gdl, u16 scale) gsSPPerspNormalize(u16 scale)Arguments
- gdl is the pointer to the graphics display list
- scale is the perspective normalization scale in .16 format
It normalizes the perspective. The scale value is used to scale the transformed w coordinate down prior to dividing out w to compute the screen coordinates, which are similarly scaled. The effect of this is to maximize the precision of this divide, which is computed with a limited precision in the RSP geometry engine.
Note The library macro guPerspective returns one approximation for this scale value, which is suitable for most cases. This estimate normalizes w so that w = 1.0 halfway between the near and far clipping planes.
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Nintendo® Confidential Warning: all information in this document is confidential and covered by a non-disclosure agreement. You are responsible for keeping this information confidential and protected. Nintendo will vigorously enforce this responsibility. Copyright © 1998 Nintendo of America Inc. All rights reserved Nintendo and N64 are registered trademarks of Nintendo Last updated January 1998 |