Function
gSPObjSubMatrix
Sets the 2D matrix for a rotating sprite
Syntax
#include <ultra64.h> /* gs2dex.h */
gSPObjSubMatrix(Gfx *gdl, uObjSubMtx *mtx)
gsSPObjSubMatrix( uObjSubMtx *mtx)
Arguments
Description
Loads the 2D matrix parameters of the uObjSubMtx structure into the 2D matrix area in the RSP. The uObjSubMtx structure is a subset of the uObjMtx structure. It holds the 2D matrix elements {X, Y, BaseScaleX, BaseScaleY} used by g*SPObjRectangleR. This macro is used primarily in concert with g*SPObjRectangleR.
The uObjSubMtx structure is shown below:
typedef struct {
s16 X, Y; /* s10.2 */
u16 BaseScaleX; /* u5.10 */
u16 BaseScaleY; /* u5.10 */
} uObjSubMtx_t;
typedef union {
uObjSubMtx_t m;
long long int force_structure_alignment;
} uObjSubMtx;
This macro only changes the 2D matrix parameters that are member variables of the uObjSubMtx structure {X, Y, BaseScaleX, BaseScaleY}. It has no effect on the values of the other parameters {A, B, C, D}.
See Also
gSPObjMatrix, gSPObjRectangleR
Revision History
02/01/99 Entirely revised.