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GB I/O: Fix STAT writing IRQ trigger conditions (fixes #2501)

This commit is contained in:
Vicki Pfau 2023-08-23 14:35:16 -07:00
parent 0acc8c2af2
commit 85c9872cd6
2 changed files with 5 additions and 1 deletions
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1
CHANGES
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@ -11,6 +11,7 @@ Emulation fixes:
- GB Audio: Fix channels 1/2 staying muted if restarted after long silence
- GB Audio: Fix channel 1 restarting if sweep applies after stop (fixes mgba.io/i/2965)
- GB I/O: Read back proper SVBK value after writing 0 (fixes mgba.io/i/2921)
- GB I/O: Fix STAT writing IRQ trigger conditions (fixes mgba.io/i/2501)
- GB Serialize: Add missing Pocket Cam state to savestates
- GB SIO: Disabling SIO should cancel pending transfers (fixes mgba.io/i/2537)
- GB Video: Implement DMG-style sprite ordering

5
src/gb/video.c
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@ -770,7 +770,10 @@ void GBVideoWriteSTAT(struct GBVideo* video, GBRegisterSTAT value) {
if (!GBRegisterLCDCIsEnable(video->p->memory.io[GB_REG_LCDC]) || video->p->model >= GB_MODEL_CGB) {
return;
}
if (!_statIRQAsserted(oldStat) && video->mode < 3) {
// Writing to STAT on a DMG selects all STAT IRQ types for one cycle.
// However, the signal that the mode 2 IRQ relies on is only high for
// one cycle, which we don't handle yet. TODO: Handle it.
if (!_statIRQAsserted(oldStat) && (video->mode < 2 || GBRegisterSTATIsLYC(video->stat))) {
// TODO: variable for the IRQ line value?
video->p->memory.io[GB_REG_IF] |= (1 << GB_IRQ_LCDSTAT);
GBUpdateIRQs(video->p);