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Reorder HDMA to do transfer 0-7, then update indirect address 0-7.

This commit is contained in:
Brandon Wright 2018-04-10 16:44:12 -05:00
parent cfa6ab1c84
commit a230f67567
1 changed files with 13 additions and 4 deletions
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17
dma.cpp
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@ -1423,13 +1423,14 @@ void S9xStartHDMA (void)
uint8 S9xDoHDMA (uint8 byte) uint8 S9xDoHDMA (uint8 byte)
{ {
struct SDMA *p = &DMA[0]; struct SDMA *p;
uint32 ShiftedIBank; uint32 ShiftedIBank;
uint16 IAddr; uint16 IAddr;
bool8 temp; bool8 temp;
int32 tmpch; int32 tmpch;
int d = 0; int d;
uint8 mask;
CPU.InHDMA = TRUE; CPU.InHDMA = TRUE;
CPU.InDMAorHDMA = TRUE; CPU.InDMAorHDMA = TRUE;
@ -1440,7 +1441,7 @@ uint8 S9xDoHDMA (uint8 byte)
// XXX: Not quite right... // XXX: Not quite right...
ADD_CYCLES(Timings.DMACPUSync); ADD_CYCLES(Timings.DMACPUSync);
for (uint8 mask = 1; mask; mask <<= 1, p++, d++) for (mask = 1, p = &DMA[0], d = 0; mask; mask <<= 1, p++, d++)
{ {
if (byte & mask) if (byte & mask)
{ {
@ -1755,7 +1756,16 @@ uint8 S9xDoHDMA (uint8 byte)
#undef DOBYTE #undef DOBYTE
} }
}
}
}
for (mask = 1, p = &DMA[0], d = 0; mask; mask <<= 1, p++, d++)
{
if (byte & mask)
{
if (p->DoTransfer)
{
if (p->HDMAIndirectAddressing) if (p->HDMAIndirectAddressing)
p->IndirectAddress += HDMA_ModeByteCounts[p->TransferMode]; p->IndirectAddress += HDMA_ModeByteCounts[p->TransferMode];
else else
@ -1771,7 +1781,6 @@ uint8 S9xDoHDMA (uint8 byte)
byte &= ~mask; byte &= ~mask;
PPU.HDMAEnded |= mask; PPU.HDMAEnded |= mask;
p->DoTransfer = FALSE; p->DoTransfer = FALSE;
continue;
} }
} }
else else