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gSPViewport
Format#include "gbi.h"
typedef struct {
short vscale[4];
/* scale, 2 bits fraction */
short vtrans[4];
/* translate, 2 bits fraction */
/* both arrays are padded to
the 64-bit boundary */
} Vp_t;
typedef union {
Vp_t vp;
long long int force_structure_alignment;
} Vp;
gSPViewport(Gfx *gdl, Vp *v)
gsSPViewport(Vp *v)
Arguments
- gdl is the pointer to the graphics display list
- v is the pointer to the viewport (segmented address)
- vscale is the scale applied to the normalized homogeneous coordinates after 4x4 projection transformation
- vtrans is the offset added to the scaled number
It sets up the viewport region of the graphics pipeline and loads the viewport projection parameter. Both vc and vo are S13.2 numbers.
Both the vscale and vtrans numbers are in screen coordinates. Array indices of 0, 1, 2 correspond to x, y, z. An array index of 3 is used for padding.
See Also
gDPSetScissor
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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 |