void CPU::scanline() {
synchronize_smp();
synchronize_ppu();
synchronize_coprocessor();
system.scanline();
if(vcounter() == 0) hdma_init();
queue.enqueue(534, QueueEvent::DramRefresh);
if(vcounter() <= (ppu.overscan() == false ? 224 : 239)) {
queue.enqueue(1104 + 8, QueueEvent::HdmaRun);
}
if(vcounter() == input.latchy) {
queue.enqueue(input.latchx, QueueEvent::ControllerLatch);
}
bool nmi_valid = status.nmi_valid;
status.nmi_valid = vcounter() >= (ppu.overscan() == false ? 225 : 240);
if(!nmi_valid && status.nmi_valid) {
status.nmi_line = true;
if(status.nmi_enabled) status.nmi_transition = true;
} else if(nmi_valid && !status.nmi_valid) {
status.nmi_line = false;
}
if(status.auto_joypad_poll_enabled && vcounter() == (ppu.overscan() == false ? 227 : 242)) {
input.poll();
run_auto_joypad_poll();
}
}
//called by ppu.tick() when Hcounter=0
void CPU::scanline() {
status.lineclocks = lineclocks();
//forcefully sync S-CPU to other processors, in case chips are not communicating
synchronize_ppu();
synchronize_smp();
synchronize_coprocessor();
system.scanline();
if(vcounter() == 0) {
//HDMA init triggers once every frame
status.hdma_init_position = (cpu_version == 1 ? 12 + 8 - dma_counter() : 12 + dma_counter());
status.hdma_init_triggered = false;
status.auto_joypad_counter = 0;
}
//DRAM refresh occurs once every scanline
if(cpu_version == 2) status.dram_refresh_position = 530 + 8 - dma_counter();
status.dram_refreshed = false;
//HDMA triggers once every visible scanline
if(vcounter() <= (ppu.overscan() == false ? 224 : 239)) {
status.hdma_position = 1104;
status.hdma_triggered = false;
}
}
void CPU::add_clocks(unsigned clocks) {
if(status.hirq_enabled) {
if(status.virq_enabled) {
unsigned cpu_time = vcounter() * 1364 + hcounter();
unsigned irq_time = status.vtime * 1364 + status.htime * 4;
unsigned framelines = (system.region() == System::Region::NTSC ? 262 : 312) + field();
if(cpu_time > irq_time) irq_time += framelines * 1364;
bool irq_valid = status.irq_valid;
status.irq_valid = cpu_time <= irq_time && cpu_time + clocks > irq_time;
if(!irq_valid && status.irq_valid) status.irq_line = true;
} else {
unsigned irq_time = status.htime * 4;
if(hcounter() > irq_time) irq_time += 1364;
bool irq_valid = status.irq_valid;
status.irq_valid = hcounter() <= irq_time && hcounter() + clocks > irq_time;
if(!irq_valid && status.irq_valid) status.irq_line = true;
}
if(status.irq_line) status.irq_transition = true;
} else if(status.virq_enabled) {
bool irq_valid = status.irq_valid;
status.irq_valid = vcounter() == status.vtime;
if(!irq_valid && status.irq_valid) status.irq_line = true;
if(status.irq_line) status.irq_transition = true;
} else {
status.irq_valid = false;
}
tick(clocks);
queue.tick(clocks);
step(clocks);
}
void CPU::add_clocks(unsigned clocks) {
if(status.hirq_enabled) {
if(status.virq_enabled) {
unsigned cpu_time = vcounter() * 1364 + hcounter();
unsigned irq_time = status.virq_pos * 1364 + status.hirq_pos * 4;
if(cpu_time > irq_time) irq_time += fieldlines() * 1364;
bool irq_valid = status.irq_valid;
status.irq_valid = cpu_time <= irq_time && cpu_time + clocks > irq_time;
if(!irq_valid && status.irq_valid) status.irq_line = true;
} else {
unsigned irq_time = status.hirq_pos * 4;
if(hcounter() > irq_time) irq_time += 1364;
bool irq_valid = status.irq_valid;
status.irq_valid = hcounter() <= irq_time && hcounter() + clocks > irq_time;
if(!irq_valid && status.irq_valid) status.irq_line = true;
}
if(status.irq_line) status.irq_transition = true;
} else if(status.virq_enabled) {
bool irq_valid = status.irq_valid;
status.irq_valid = vcounter() == status.virq_pos;
if(!irq_valid && status.irq_valid) status.irq_line = true;
if(status.irq_line) status.irq_transition = true;
} else {
status.irq_valid = false;
}
tick(clocks);
queue.tick(clocks);
step(clocks);
}
//HVBJOY
//7 = VBLANK acknowledge
//6 = HBLANK acknowledge
//5-1 = MDR
//0 = JOYPAD acknowledge
uint8 CPU::mmio_r4212() {
uint8 r = (regs.mdr & 0x3e);
uint16 vs = ppu.overscan() == false ? 225 : 240;
if(vcounter() >= vs && vcounter() <= (vs + 2)) r |= 0x01; //auto joypad polling
if(hcounter() <= 2 || hcounter() >= 1096) r |= 0x40; //hblank
if(vcounter() >= vs) r |= 0x80; //vblank
return r;
}
void PPU::enter() {
while(true) {
if(scheduler.sync == Scheduler::SynchronizeMode::All) {
scheduler.exit(Scheduler::ExitReason::SynchronizeEvent);
}
scanline();
if(vcounter() < display.height && vcounter()) {
add_clocks(512);
render_scanline();
add_clocks(lineclocks() - 512);
} else {
add_clocks(lineclocks());
}
}
}
void PPU::scanline() {
if(vcounter() == 0) {
frame();
bg1.frame();
bg2.frame();
bg3.frame();
bg4.frame();
}
bg1.scanline();
bg2.scanline();
bg3.scanline();
bg4.scanline();
oam.scanline();
window.scanline();
screen.scanline();
}
void PPU::scanline() {
line = vcounter();
if(line == 0) {
frame();
//RTO flag reset
regs.time_over = false;
regs.range_over = false;
}
if(line == 1) {
//mosaic reset
for(int bg = BG1; bg <= BG4; bg++) regs.bg_y[bg] = 1;
regs.mosaic_countdown = regs.mosaic_size + 1;
regs.mosaic_countdown--;
} else {
for(int bg = BG1; bg <= BG4; bg++) {
if(!regs.mosaic_enabled[bg] || !regs.mosaic_countdown) regs.bg_y[bg] = line;
}
if(!regs.mosaic_countdown) regs.mosaic_countdown = regs.mosaic_size + 1;
regs.mosaic_countdown--;
}
}
uint8 CPU::mmio_read(unsigned addr) {
if((addr & 0xffc0) == 0x2140) {
synchronize_smp();
return smp.port_read(addr & 3);
}
switch(addr & 0xffff) {
case 0x2180: {
uint8 result = bus.read(0x7e0000 | status.wram_addr);
status.wram_addr = (status.wram_addr + 1) & 0x01ffff;
return result;
}
case 0x4016: {
uint8 result = regs.mdr & 0xfc;
result |= input.port1->data() & 3;
return result;
}
case 0x4017: {
uint8 result = (regs.mdr & 0xe0) | 0x1c;
result |= input.port2->data() & 3;
if (!status.auto_joypad_poll_enabled) interface()->inputNotify(0x4017);
return result;
}
case 0x4210: {
uint8 result = (regs.mdr & 0x70);
result |= status.nmi_line << 7;
result |= 0x02; //CPU revision
status.nmi_line = false;
return result;
}
case 0x4211: {
uint8 result = (regs.mdr & 0x7f);
result |= status.irq_line << 7;
status.irq_line = false;
return result;
}
case 0x4212: {
uint8 result = (regs.mdr & 0x3e);
unsigned vbstart = ppu.overscan() == false ? 225 : 240;
if(vcounter() >= vbstart && vcounter() <= vbstart + 2) result |= 0x01;
if(hcounter() <= 2 || hcounter() >= 1096) result |= 0x40;
if(vcounter() >= vbstart) result |= 0x80;
return result;
}
case 0x4213:
// interface()->inputNotify(0x4213); // if there are lag counter issues with super scope, uncomment this
return status.pio;
case 0x4214: return status.rddiv >> 0;
case 0x4215: return status.rddiv >> 8;
case 0x4216: return status.rdmpy >> 0;
case 0x4217: return status.rdmpy >> 8;
case 0x4218: interface()->inputNotify(0x4218); return status.joy1l;
case 0x4219: interface()->inputNotify(0x4219); return status.joy1h;
case 0x421a: interface()->inputNotify(0x421a); return status.joy2l;
case 0x421b: interface()->inputNotify(0x421b); return status.joy2h;
case 0x421c: interface()->inputNotify(0x421c); return status.joy3l;
case 0x421d: interface()->inputNotify(0x421d); return status.joy3h;
case 0x421e: interface()->inputNotify(0x421e); return status.joy4l;
case 0x421f: interface()->inputNotify(0x421f); return status.joy4h;
}
if((addr & 0xff80) == 0x4300) {
unsigned i = (addr >> 4) & 7;
switch(addr & 0xff8f) {
case 0x4300: {
return (channel[i].direction << 7)
| (channel[i].indirect << 6)
| (channel[i].unused << 5)
| (channel[i].reverse_transfer << 4)
| (channel[i].fixed_transfer << 3)
| (channel[i].transfer_mode << 0);
}
case 0x4301: return channel[i].dest_addr;
case 0x4302: return channel[i].source_addr >> 0;
case 0x4303: return channel[i].source_addr >> 8;
case 0x4304: return channel[i].source_bank;
case 0x4305: return channel[i].transfer_size >> 0;
case 0x4306: return channel[i].transfer_size >> 8;
case 0x4307: return channel[i].indirect_bank;
case 0x4308: return channel[i].hdma_addr >> 0;
case 0x4309: return channel[i].hdma_addr >> 8;
case 0x430a: return channel[i].line_counter;
case 0x430b: case 0x430f: return channel[i].unknown;
}
}
void PPU::scanline() {
display.width = !hires() ? 256 : 512;
display.height = !overscan() ? 225 : 240;
if(vcounter() == 0) frame();
if(vcounter() == display.height && regs.display_disable == false) oam.address_reset();
}
uint16 PPUcounter::hdot() const {
if(system.region.i == System::Region::NTSC && status.interlace == false && vcounter() == 240 && field() == 1) {
return (hcounter() >> 2);
} else {
return (hcounter() - ((hcounter() > 1292) << 1) - ((hcounter() > 1310) << 1)) >> 2;
