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VRAM conflicts during halt/stop on a CGB

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This commit is contained in:
Lior Halphon 2022-01-22 22:52:34 +02:00
parent 196aaaa7ed
commit 0ab7bf7749
1 changed files with 3 additions and 2 deletions
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5
Core/display.c
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@ -679,18 +679,19 @@ static inline uint8_t vram_read(GB_gameboy_t *gb, uint16_t addr)
// DMAing from VRAM!
/* TODO: AGS has its own, very different pattern, but AGS is not currently a supported model */
/* TODO: Research this when researching odd modes */
/* TODO: probably not 100% on the first few reads during halt/stop modes*/
if (GB_is_cgb(gb)) {
if (gb->dma_ppu_vram_conflict) {
addr = (gb->dma_ppu_vram_conflict_addr & 0x1FFF) | (addr & 0x2000);
}
else if (gb->dma_cycles_modulo) {
else if (gb->dma_cycles_modulo && !gb->halted && !gb->stopped) {
addr &= 0x2000;
addr |= ((gb->dma_current_src - 1) & 0x1FFF);
}
else {
addr &= 0x2000 | ((gb->dma_current_src - 1) & 0x1FFF);
gb->dma_ppu_vram_conflict_addr = addr;
gb->dma_ppu_vram_conflict = true;
gb->dma_ppu_vram_conflict = !gb->halted && !gb->stopped;
}
}
else {