static bool _statIRQAsserted(struct GBVideo* video, GBRegisterSTAT stat) {
// TODO: variable for the IRQ line value?
if (GBRegisterSTATIsLYCIRQ(stat) && GBRegisterSTATIsLYC(stat)) {
return true;
}
switch (GBRegisterSTATGetMode(stat)) {
case 0:
if (GBRegisterSTATIsHblankIRQ(stat)) {
return true;
}
break;
case 1:
if (GBRegisterSTATIsVblankIRQ(stat)) {
return true;
}
break;
case 2:
if (GBRegisterSTATIsOAMIRQ(stat)) {
return true;
}
break;
case 3:
break;
}
return false;
}
void _endMode0(struct mTiming* timing, void* context, uint32_t cyclesLate) {
struct GBVideo* video = context;
if (video->frameskipCounter <= 0) {
video->renderer->finishScanline(video->renderer, video->ly);
}
int lyc = video->p->memory.io[REG_LYC];
int32_t next;
++video->ly;
video->p->memory.io[REG_LY] = video->ly;
GBRegisterSTAT oldStat = video->stat;
if (video->ly < GB_VIDEO_VERTICAL_PIXELS) {
next = GB_VIDEO_MODE_2_LENGTH;
video->mode = 2;
video->modeEvent.callback = _endMode2;
} else {
next = GB_VIDEO_HORIZONTAL_LENGTH;
video->mode = 1;
video->modeEvent.callback = _endMode1;
mTimingDeschedule(&video->p->timing, &video->frameEvent);
mTimingSchedule(&video->p->timing, &video->frameEvent, -cyclesLate);
if (!_statIRQAsserted(video, oldStat) && GBRegisterSTATIsOAMIRQ(video->stat)) {
video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
}
video->p->memory.io[REG_IF] |= (1 << GB_IRQ_VBLANK);
}
video->stat = GBRegisterSTATSetMode(video->stat, video->mode);
if (!_statIRQAsserted(video, oldStat) && _statIRQAsserted(video, video->stat)) {
video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
}
// LYC stat is delayed 1 T-cycle
oldStat = video->stat;
video->stat = GBRegisterSTATSetLYC(video->stat, lyc == video->ly);
if (!_statIRQAsserted(video, oldStat) && _statIRQAsserted(video, video->stat)) {
video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
}
GBUpdateIRQs(video->p);
video->p->memory.io[REG_STAT] = video->stat;
mTimingSchedule(timing, &video->modeEvent, (next << video->p->doubleSpeed) - cyclesLate);
}
int32_t GBVideoProcessEvents(struct GBVideo* video, int32_t cycles) {
video->eventDiff += cycles;
if (video->nextEvent != INT_MAX) {
video->nextEvent -= cycles;
}
if (video->nextEvent <= 0) {
if (video->nextEvent != INT_MAX) {
video->nextMode -= video->eventDiff;
video->nextFrame -= video->eventDiff;
}
video->nextEvent = INT_MAX;
GBVideoProcessDots(video);
if (video->nextMode <= 0) {
int lyc = video->p->memory.io[REG_LYC];
switch (video->mode) {
case 0:
if (video->frameskipCounter <= 0) {
video->renderer->finishScanline(video->renderer, video->ly);
}
++video->ly;
video->p->memory.io[REG_LY] = video->ly;
video->stat = GBRegisterSTATSetLYC(video->stat, lyc == video->ly);
if (video->ly < GB_VIDEO_VERTICAL_PIXELS) {
video->nextMode = GB_VIDEO_MODE_2_LENGTH;
video->mode = 2;
if (!GBRegisterSTATIsHblankIRQ(video->stat) && GBRegisterSTATIsOAMIRQ(video->stat)) {
video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
}
} else {
video->nextMode = GB_VIDEO_HORIZONTAL_LENGTH;
video->mode = 1;
--video->frameskipCounter;
if (video->frameskipCounter < 0) {
mCoreSyncPostFrame(video->p->sync);
video->frameskipCounter = video->frameskip;
}
++video->frameCounter;
if (video->nextFrame != 0) {
video->nextFrame = 0;
}
if (video->p->stream && video->p->stream->postVideoFrame) {
const color_t* pixels;
unsigned stride;
video->renderer->getPixels(video->renderer, &stride, (const void**) &pixels);
video->p->stream->postVideoFrame(video->p->stream, pixels, stride);
}
if (GBRegisterSTATIsVblankIRQ(video->stat) || GBRegisterSTATIsOAMIRQ(video->stat)) {
video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
}
video->p->memory.io[REG_IF] |= (1 << GB_IRQ_VBLANK);
}
if (GBRegisterSTATIsLYCIRQ(video->stat) && lyc == video->ly) {
video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
}
GBUpdateIRQs(video->p);
break;
case 1:
// TODO: One M-cycle delay
++video->ly;
if (video->ly == GB_VIDEO_VERTICAL_TOTAL_PIXELS + 1) {
video->ly = 0;
video->p->memory.io[REG_LY] = video->ly;
video->nextMode = GB_VIDEO_MODE_2_LENGTH;
video->mode = 2;
if (GBRegisterSTATIsOAMIRQ(video->stat)) {
video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
GBUpdateIRQs(video->p);
}
video->renderer->finishFrame(video->renderer);
break;
} else if (video->ly == GB_VIDEO_VERTICAL_TOTAL_PIXELS) {
video->p->memory.io[REG_LY] = 0;
video->nextMode = GB_VIDEO_HORIZONTAL_LENGTH - 8;
} else if (video->ly == GB_VIDEO_VERTICAL_TOTAL_PIXELS - 1) {
video->p->memory.io[REG_LY] = video->ly;
video->nextMode = 8;
} else {
video->p->memory.io[REG_LY] = video->ly;
video->nextMode = GB_VIDEO_HORIZONTAL_LENGTH;
}
video->stat = GBRegisterSTATSetLYC(video->stat, lyc == video->p->memory.io[REG_LY]);
if (GBRegisterSTATIsLYCIRQ(video->stat) && lyc == video->p->memory.io[REG_LY]) {
video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
GBUpdateIRQs(video->p);
}
if (video->p->memory.mbcType == GB_MBC7 && video->p->memory.rotation && video->p->memory.rotation->sample) {
video->p->memory.rotation->sample(video->p->memory.rotation);
}
break;
case 2:
_cleanOAM(video, video->ly);
video->dotCounter = 0;
video->nextEvent = GB_VIDEO_HORIZONTAL_LENGTH;
video->x = 0;
video->nextMode = GB_VIDEO_MODE_3_LENGTH_BASE + video->objMax * 12;
video->mode = 3;
break;
case 3:
video->nextMode = GB_VIDEO_MODE_0_LENGTH_BASE - video->objMax * 12;
video->mode = 0;
if (GBRegisterSTATIsHblankIRQ(video->stat)) {
video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
GBUpdateIRQs(video->p);
}
if (video->ly < GB_VIDEO_VERTICAL_PIXELS && video->p->memory.isHdma && video->p->memory.io[REG_HDMA5] != 0xFF) {
video->p->memory.hdmaRemaining = 0x10;
video->p->memory.hdmaNext = video->p->cpu->cycles;
}
break;
}
video->stat = GBRegisterSTATSetMode(video->stat, video->mode);
video->p->memory.io[REG_STAT] = video->stat;
}
if (video->nextFrame <= 0) {
if (video->p->cpu->executionState == LR35902_CORE_FETCH) {
GBFrameEnded(video->p);
struct mCoreThread* thread = mCoreThreadGet();
if (thread && thread->frameCallback) {
thread->frameCallback(thread);
}
video->nextFrame = GB_VIDEO_TOTAL_LENGTH;
} else {
video->nextFrame = 4 - ((video->p->cpu->executionState + 1) & 3);
if (video->nextFrame < video->nextEvent) {
video->nextEvent = video->nextFrame;
}
}
}
if (video->nextMode < video->nextEvent) {
video->nextEvent = video->nextMode;
}
video->eventDiff = 0;
}
return video->nextEvent;
}