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GB Video: Fix state after skipping BIOS (fixes #1715 and fixes #1716)

This commit is contained in:
Vicki Pfau 2020-05-13 01:56:46 -07:00
parent f33593537b
commit 9ddf82bebc
4 changed files with 22 additions and 1 deletions
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1
CHANGES
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@ -6,6 +6,7 @@ Emulation fixes:
- ARM: Fix ALU reading PC after shifting
- ARM: Fix STR storing PC after address calculation
- GB: Fix GBC game registers after skipping BIOS
- GB Video: Fix state after skipping BIOS (fixes mgba.io/i/1715 and mgba.io/i/1716)
- GBA: Add missing RTC overrides for Legendz games
- GBA BIOS: Implement dummy sound driver calls
- GBA BIOS: Improve HLE BIOS timing

1
include/mgba/internal/gb/video.h
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@ -161,6 +161,7 @@ void GBVideoInit(struct GBVideo* video);
void GBVideoReset(struct GBVideo* video);
void GBVideoDeinit(struct GBVideo* video);
void GBVideoAssociateRenderer(struct GBVideo* video, struct GBVideoRenderer* renderer);
void GBVideoSkipBIOS(struct GBVideo* video);
void GBVideoProcessDots(struct GBVideo* video, uint32_t cyclesLate);
void GBVideoWriteLCDC(struct GBVideo* video, GBRegisterLCDC value);

3
src/gb/gb.c
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@ -460,13 +460,13 @@ void GBReset(struct SM83Core* cpu) {
GBVideoReset(&gb->video);
GBTimerReset(&gb->timer);
GBIOReset(gb);
if (!gb->biosVf) {
GBSkipBIOS(gb);
} else {
mTimingSchedule(&gb->timing, &gb->timer.event, 0);
}
GBIOReset(gb);
GBAudioReset(&gb->audio);
GBSIOReset(&gb->sio);
@ -561,6 +561,7 @@ void GBSkipBIOS(struct GB* gb) {
mTimingSchedule(&gb->timing, &gb->timer.event, 0);
GBIOWrite(gb, REG_LCDC, 0x91);
GBVideoSkipBIOS(&gb->video);
if (gb->biosVf) {
GBUnmapBIOS(gb);

18
src/gb/video.c
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@ -214,6 +214,24 @@ static bool _statIRQAsserted(GBRegisterSTAT stat) {
return false;
}
void GBVideoSkipBIOS(struct GBVideo* video) {
video->mode = 1;
video->modeEvent.callback = _endMode1;
if (video->p->model == GB_MODEL_CGB) {
video->ly = GB_VIDEO_VERTICAL_PIXELS;
video->p->memory.io[REG_LY] = video->ly;
video->stat = GBRegisterSTATClearLYC(video->stat);
}
video->stat = GBRegisterSTATSetMode(video->stat, video->mode);
video->p->memory.io[REG_IF] |= (1 << GB_IRQ_VBLANK);
GBUpdateIRQs(video->p);
video->p->memory.io[REG_STAT] = video->stat;
mTimingDeschedule(&video->p->timing, &video->modeEvent);
mTimingSchedule(&video->p->timing, &video->modeEvent, GB_VIDEO_HORIZONTAL_LENGTH << video->p->doubleSpeed);
}
void _endMode0(struct mTiming* timing, void* context, uint32_t cyclesLate) {
struct GBVideo* video = context;
if (video->frameskipCounter <= 0) {