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core: 

- fix BGs;
This commit is contained in:
mtabachenko 2008-12-31 14:07:09 +00:00
parent ed782533b8
commit 7c7cd504d2
1 changed files with 9 additions and 7 deletions
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16
desmume/src/GPU.cpp
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@ -1102,14 +1102,16 @@ INLINE void renderline_textBG(GPU * gpu, u8 num, u8 * dst, u32 Y, u16 XBG, u16 Y
//zero 30-dec-2008 - if you mask by 31 here, you lose the ability to correctly map the bottom half of 512-tall BG.
//the masking to keep it to a reasonable value was already done when tmp was calculated
//map = (u8 *)MMU_RenderMapToLCD(gpu->BG_map_ram[num] + (tmp&31) * 64);
map = (u8 *)MMU_RenderMapToLCD(gpu->BG_map_ram[num] + (tmp) * 64);
if (!map) return;
if(tmp>31)
map+= ADDRESS_STEP_512B << bgCnt->ScreenSize ;
// this is broke some games
//map = (u8 *)MMU_RenderMapToLCD(gpu->BG_map_ram[num] + (tmp) * 64);
u32 tmp_map = gpu->BG_map_ram[num] + (tmp&31) * 64;
if(tmp>31)
tmp_map+= ADDRESS_STEP_512B << bgCnt->ScreenSize ;
map = (u8 *)MMU_RenderMapToLCD(tmp_map);
if(!map) return; // no map
tile = (u8*) MMU_RenderMapToLCD(gpu->BG_tile_ram[num]);
if(!tile) return; // no tiles