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Some minor optimiSome minor optimizations to the BG mosaic func. 

Feel free to correct any problem I may have introduced!
This commit is contained in:
luigi__ 2009-01-21 21:48:44 +00:00
parent d742dd7745
commit 47785d2015
1 changed files with 32 additions and 25 deletions
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57
desmume/src/GPU.cpp
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@ -1591,40 +1591,47 @@ static BOOL setFinal3DColorSpecialDecreaseWnd(GPU *gpu, u32 passing, u8 *dst, u1
static void __setFinalColorBck(GPU *gpu, u32 passing, u8 bgnum, u8 *dst, u16 color, u16 x, bool opaque)
{
if(!opaque) color = 0xFFFF;
else color &= 0x7FFF;
u8 y = gpu->currLine;
//I intend to cache all this at the beginning of line rendering
struct _BGxCNT *bgCnt = &(gpu->dispx_st)->dispx_BGxCNT[bgnum].bits;
u16 mosaic_control = T1ReadWord((u8 *)&gpu->dispx_st->dispx_MISC.MOSAIC, 0);
bool enabled = bgCnt->Mosaic_Enable;
u8 mw = (mosaic_control & 0xF) +1 ; // horizontal granularity of the mosaic
u8 mh = ((mosaic_control>>4) & 0xF) +1 ; // vertical granularity of the mosaic
//mosaic test hacks
//mw = 4;
//mh = 4;
//enabled = true;
// if(!opaque) color = 0xFFFF;
// else color &= 0x7FFF;
if(!opaque)
return;
//I intend to make all this a 16x256 lookup table
if(enabled)
{
bool x_zero = (x%mw)==0;
bool y_zero = (y%mh)==0;
int x_int;
if(enabled)
x_int = x/mw*mw;
else
x_int = x;
u8 y = gpu->currLine;
if(x_zero && y_zero) {}
else color = gpu->MosaicColors.bg[bgnum][x_int];
gpu->MosaicColors.bg[bgnum][x] = color;
//I intend to cache all this at the beginning of line rendering
u16 mosaic_control = T1ReadWord((u8 *)&gpu->dispx_st->dispx_MISC.MOSAIC, 0);
u8 mw = (mosaic_control & 0xF) +1 ; // horizontal granularity of the mosaic
u8 mh = ((mosaic_control>>4) & 0xF) +1 ; // vertical granularity of the mosaic
//mosaic test hacks
//mw = 4;
//mh = 4;
//enabled = true;
//I intend to make all this a 16x256 lookup table
// if(enabled)
{
bool x_zero = (x%mw)==0;
bool y_zero = (y%mh)==0;
int x_int;
if(enabled)
x_int = x/mw*mw;
else
x_int = x;
if(x_zero && y_zero) {}
else color = gpu->MosaicColors.bg[bgnum][x_int];
gpu->MosaicColors.bg[bgnum][x] = color;
}
}
if(color != 0xFFFF)
// if(color != 0xFFFF)
gpu->setFinalColorBck(gpu,0,bgnum,dst,color,x);
}