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block reading of BGxHOFS and BGxVOFS registers. fixes some ratatouille stages

This commit is contained in:
zeromus 2014-08-10 04:42:33 +00:00
parent bbc1517cc8
commit 204e9b46e5
1 changed files with 33 additions and 0 deletions
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33
desmume/src/MMU.cpp
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@ -4391,6 +4391,26 @@ u8 FASTCALL _MMU_ARM9_read08(u32 adr)
case REG_SQRTCNT+2: printf("ERROR 8bit SQRTCNT+2 READ\n"); return 0;
case REG_SQRTCNT+3: printf("ERROR 8bit SQRTCNT+3 READ\n"); return 0;
//these aren't readable
case REG_DISPA_BG0HOFS: case REG_DISPA_BG0HOFS+1:
case REG_DISPA_BG1HOFS: case REG_DISPA_BG1HOFS+1:
case REG_DISPA_BG2HOFS: case REG_DISPA_BG2HOFS+1:
case REG_DISPA_BG3HOFS: case REG_DISPA_BG3HOFS+1:
case REG_DISPB_BG0HOFS: case REG_DISPB_BG0HOFS+1:
case REG_DISPB_BG1HOFS: case REG_DISPB_BG1HOFS+1:
case REG_DISPB_BG2HOFS: case REG_DISPB_BG2HOFS+1:
case REG_DISPB_BG3HOFS: case REG_DISPB_BG3HOFS+1:
case REG_DISPA_BG0VOFS: case REG_DISPA_BG0VOFS+1:
case REG_DISPA_BG1VOFS: case REG_DISPA_BG1VOFS+1:
case REG_DISPA_BG2VOFS: case REG_DISPA_BG2VOFS+1:
case REG_DISPA_BG3VOFS: case REG_DISPA_BG3VOFS+1:
case REG_DISPB_BG0VOFS: case REG_DISPB_BG0VOFS+1:
case REG_DISPB_BG1VOFS: case REG_DISPB_BG1VOFS+1:
case REG_DISPB_BG2VOFS: case REG_DISPB_BG2VOFS+1:
case REG_DISPB_BG3VOFS: case REG_DISPB_BG3VOFS+1:
return 0;
//Nostalgia's options menu requires that these work
case REG_DIVCNT: return (MMU_new.div.read16() & 0xFF);
case REG_DIVCNT+1: return ((MMU_new.div.read16()>>8) & 0xFF);
@ -4463,6 +4483,13 @@ u16 FASTCALL _MMU_ARM9_read16(u32 adr)
case REG_DISPA_DISPSTAT:
break;
//these aren't readable
case REG_DISPA_BG0HOFS: case REG_DISPA_BG1HOFS: case REG_DISPA_BG2HOFS: case REG_DISPA_BG3HOFS:
case REG_DISPB_BG0HOFS: case REG_DISPB_BG1HOFS: case REG_DISPB_BG2HOFS: case REG_DISPB_BG3HOFS:
case REG_DISPA_BG0VOFS: case REG_DISPA_BG1VOFS: case REG_DISPA_BG2VOFS: case REG_DISPA_BG3VOFS:
case REG_DISPB_BG0VOFS: case REG_DISPB_BG1VOFS: case REG_DISPB_BG2VOFS: case REG_DISPB_BG3VOFS:
return 0;
case REG_SQRTCNT: return MMU_new.sqrt.read16();
//sqrtcnt isnt big enough for this to exist. but it'd probably return 0 so its ok
case REG_SQRTCNT+2: printf("ERROR 16bit SQRTCNT+2 READ\n"); return 0;
@ -4573,6 +4600,12 @@ u32 FASTCALL _MMU_ARM9_read32(u32 adr)
if(!nds.Is_DSI()) break;
return 0x8000;
//these aren't readable.
//note: ratatouille stage 3 begins testing this.. it will write a 256, then read it, and if it reads back a 256, the 3d display will be scrolled invisibly. it needs to read a 0 to cause an unscrolled 3d display.
case REG_DISPA_BG0HOFS: case REG_DISPA_BG1HOFS: case REG_DISPA_BG2HOFS: case REG_DISPA_BG3HOFS:
case REG_DISPB_BG0HOFS: case REG_DISPB_BG1HOFS: case REG_DISPB_BG2HOFS: case REG_DISPB_BG3HOFS:
return 0;
case REG_DISPA_DISPSTAT:
break;