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desmume
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core: 

- temporary implementations for clearing VRAM (garbage on screen);
This commit is contained in:
mtabachenko 2008-11-15 18:09:41 +00:00
parent 9cbd4d7035
commit da981a84ed
1 changed files with 98 additions and 4 deletions
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102
desmume/src/MMU.cpp
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@ -227,6 +227,8 @@ u32 MMU_ARM7_WAIT32[16]={
1, 1, 1, 1, 1, 1, 1, 1, 8, 8, 5, 1, 1, 1, 1, 1,
};
static u8 MMU_VRAMcntSaved[10];
void MMU_Init(void) {
int i;
@ -256,6 +258,8 @@ void MMU_Init(void) {
MMU.MMU_WAIT32[0] = MMU_ARM9_WAIT32;
MMU.MMU_WAIT32[1] = MMU_ARM7_WAIT32;
memset(MMU_VRAMcntSaved, 0, sizeof(MMU_VRAMcntSaved[0])*10);
FIFOclear(&MMU.fifos[0]);
FIFOclear(&MMU.fifos[1]);
@ -312,6 +316,8 @@ void MMU_clearMem()
memset(MMU.ARM7_ERAM, 0, 0x010000);
memset(MMU.ARM7_REG, 0, 0x010000);
memset(MMU_VRAMcntSaved, 0, sizeof(MMU_VRAMcntSaved[0])*10);
FIFOclear(&MMU.fifos[0]);
FIFOclear(&MMU.fifos[1]);
@ -355,6 +361,96 @@ void MMU_clearMem()
rtcInit();
}
// temporary implementations for clearing VRAM (garbage on screen)
// TODO: rewrite VRAM control
static u8 MMU_checkVRAM(u8 block, u8 val)
{
u32 size = 0;
u8 *destination = NULL;
if ((val & 0x80))
{
MMU_VRAMcntSaved[block] = val;
return 1;
}
if (MMU_VRAMcntSaved[block] == 0) return 2;
switch (MMU_VRAMcntSaved[block] & 0x07)
{
case 0:
break;
case 1:
switch (block)
{
case 0: // A
case 1: // B
case 2: // C
case 3: // D
size = 0x20000 ;
destination = ARM9Mem.ARM9_ABG + ((MMU_VRAMcntSaved[block] >> 3) & 3) * 0x20000 ;
break;
case 4: // E
size = 0x10000;
destination = ARM9Mem.ARM9_ABG ;
break;
case 5: // F
case 6: // G
size = 0x4000;
destination = ARM9Mem.ARM9_ABG +
(((MMU_VRAMcntSaved[block] >> 3) & 0x01) * 0x4000) +
(((MMU_VRAMcntSaved[block] >> 4) & 0x1) * 0x10000) ;
break;
case 8: // H
size = 0x8000;
destination = ARM9Mem.ARM9_BBG ;
break;
case 9: // I
size = 0x4000;
destination = ARM9Mem.ARM9_BBG + 0x8000;
break ;
}
break;
case 2:
switch(block)
{
case 0:
case 1:
// banks A,B are in use for OBJ at AOBJ + ofs * 0x20000
size = 0x20000;
destination = ARM9Mem.ARM9_AOBJ+(((MMU_VRAMcntSaved[block]>>3)&1)*0x20000);
break;
case 4: // E
size = 0x10000;
destination = ARM9Mem.ARM9_AOBJ;
break;
case 5:
case 6:
size = 0x4000;
destination = ARM9Mem.ARM9_AOBJ+
(((MMU_VRAMcntSaved[block]>>3)&1)*0x4000)+
(((MMU_VRAMcntSaved[block]>>4)&1)*0x10000);
break;
}
break;
case 4:
switch(block)
{
case 2: // C
size = 0x20000;
destination = ARM9Mem.ARM9_BBG ;
break ;
case 3: // D
size = 0x20000;
break ;
}
break;
}
if (!destination) return 3;
memset(destination, 0, size) ;
return 0;
}
/* the VRAM blocks keep their content even when not blended in */
/* to ensure that we write the content back to the LCD ram */
/* FIXME: VRAM Bank E,F,G,H,I missing */
@ -485,10 +581,6 @@ static void MMU_VRAMWriteBackToLCD(u8 block)
if (!destination) return ;
if (!source) return ;
memcpy(destination,source,size) ;
//zero 10/10/08 - if vram is not mapped, then when it is read from, it should be zero
//mimic this by clearing it now.
memset(source,0,size) ;
}
static void MMU_VRAMReloadFromLCD(u8 block,u8 VRAMBankCnt)
@ -1091,6 +1183,8 @@ void FASTCALL _MMU_write8(u32 adr, u8 val)
case REG_VRAMCNTD:
if(proc == ARMCPU_ARM9)
{
if (MMU_checkVRAM(adr-REG_VRAMCNTA, val) == 1) break;
MMU_VRAMWriteBackToLCD(adr-REG_VRAMCNTA) ;
switch(val & 0x1F)
{