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/*---------------------------------------------------------------------
$Id: us2dex.c,v 1.4 1998/10/09 06:15:30 has Exp $
File : us2dex.c
Coded by Yoshitaka Yasumoto. Mar 19, 1997.
Copyright by Nintendo, Co., Ltd. 1997.
---------------------------------------------------------------------*/
#include <ultra64.h>
#include <PR/gs2dex.h>
/*
* Routines that support processing of S2DEX microcode
*/
/*
* guS2DInitBG
* Set BG screen draw parameters
*
* If called at time of initialization, then it only needs to be
* called again when changes made to imageFmt, imageSiz, imageLoad, * imageW, frameW. However, if imageLoad == G_BGLT_LOADBLOCK and * only frameW is changed, another call is unnecessary.
*/
void guS2DInitBg(uObjBg *bg)
{
u16 tmemUse;
u16 shift;
#if BUILD_VERSION >= VERSION_J
u32 tsize;
#endif
/*
* Get the useable volume for TMEM
* If imageFmt is CI then TLUT will use half.
*/
tmemUse = (bg->b.imageFmt == G_IM_FMT_CI) ? 256 : 512;
/*
* Get shift volume for conversion to TMEM word.
*/
shift = 6 - bg->b.imageSiz;
/*
* Set other parameters for Load Mode.
*/
if (bg->b.imageLoad == G_BGLT_LOADBLOCK){
bg->b.tmemW = bg->b.imageW >> shift;
bg->b.tmemH = (tmemUse / bg->b.tmemW) << 2;
bg->b.tmemSizeW = bg->b.tmemW << 1;
bg->b.tmemSize = bg->b.tmemH * bg->b.tmemSizeW;
bg->b.tmemLoadSH = (bg->b.tmemSize>>1) - 1;
bg->b.tmemLoadTH = GS_CALC_DXT(bg->b.tmemW);
} else {
#if BUILD_VERSION >= VERSION_J
bg->b.tmemW = (bg->b.frameW >> shift) + 3;
bg->b.tmemH = (tmemUse / bg->b.tmemW) << 2;
bg->b.tmemSizeW = (bg->b.imageW >> shift) * 2;
tsize = bg->b.tmemH * bg->b.tmemSizeW;
bg->b.tmemSize = tsize >> 16;
bg->b.tmemLoadSH = tsize & 0xffff;
bg->b.tmemLoadTH = bg->b.tmemH - 1;
#else
bg->b.tmemW = (bg->b.frameW >> shift) + 1;
bg->b.tmemH = (tmemUse / bg->b.tmemW) << 2;
bg->b.tmemSizeW = (bg->b.imageW >> shift) * 2;
bg->b.tmemSize = bg->b.tmemH * bg->b.tmemSizeW;
bg->b.tmemLoadSH = (bg->b.tmemW<<4) - 1;
bg->b.tmemLoadTH = bg->b.tmemH - 1;
#endif
}
return;
}
/*======== End of us2dex.c ========*/
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