mirror of https://github.com/bsnes-emu/bsnes.git
116 lines
3.3 KiB
C++
116 lines
3.3 KiB
C++
auto CPU::queue_event(uint id) -> void {
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switch(id) {
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case QueueEvent::DramRefresh: return add_clocks(40);
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case QueueEvent::HdmaRun: return hdma_run();
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}
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}
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auto CPU::last_cycle() -> void {
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if(status.irq_lock) {
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status.irq_lock = false;
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return;
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}
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if(status.nmi_transition) {
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regs.wai = false;
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status.nmi_transition = false;
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status.nmi_pending = true;
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}
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if(status.irq_transition || regs.irq) {
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regs.wai = false;
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status.irq_transition = false;
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status.irq_pending = !regs.p.i;
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}
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}
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auto CPU::add_clocks(uint clocks) -> void {
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if(status.hirq_enabled) {
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if(status.virq_enabled) {
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uint cpu_time = vcounter() * 1364 + hcounter();
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uint irq_time = status.vtime * 1364 + status.htime * 4;
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uint framelines = (system.region() == System::Region::NTSC ? 262 : 312) + (ppu.interlace() && !field());
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if(cpu_time > irq_time) irq_time += framelines * 1364;
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bool irq_valid = status.irq_valid;
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status.irq_valid = cpu_time <= irq_time && cpu_time + clocks > irq_time;
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if(!irq_valid && status.irq_valid) status.irq_line = true;
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} else {
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uint irq_time = status.htime * 4;
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if(hcounter() > irq_time) irq_time += 1364;
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bool irq_valid = status.irq_valid;
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status.irq_valid = hcounter() <= irq_time && hcounter() + clocks > irq_time;
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if(!irq_valid && status.irq_valid) status.irq_line = true;
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}
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if(status.irq_line) status.irq_transition = true;
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} else if(status.virq_enabled) {
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bool irq_valid = status.irq_valid;
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status.irq_valid = vcounter() == status.vtime;
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if(!irq_valid && status.irq_valid) status.irq_line = true;
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if(status.irq_line) status.irq_transition = true;
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} else {
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status.irq_valid = false;
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}
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tick(clocks);
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queue.tick(clocks);
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step(clocks);
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}
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auto CPU::scanline() -> void {
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synchronizeSMP();
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synchronizePPU();
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synchronizeCoprocessors();
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system.scanline();
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if(vcounter() == 0) hdma_init();
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queue.enqueue(534, QueueEvent::DramRefresh);
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if(vcounter() <= (ppu.overscan() == false ? 224 : 239)) {
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queue.enqueue(1104 + 8, QueueEvent::HdmaRun);
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}
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bool nmi_valid = status.nmi_valid;
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status.nmi_valid = vcounter() >= (ppu.overscan() == false ? 225 : 240);
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if(!nmi_valid && status.nmi_valid) {
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status.nmi_line = true;
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if(status.nmi_enabled) status.nmi_transition = true;
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} else if(nmi_valid && !status.nmi_valid) {
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status.nmi_line = false;
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}
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if(status.auto_joypad_poll_enabled && vcounter() == (ppu.overscan() == false ? 227 : 242)) {
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run_auto_joypad_poll();
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}
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}
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auto CPU::run_auto_joypad_poll() -> void {
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device.controllerPort1->latch(1);
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device.controllerPort2->latch(1);
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device.controllerPort1->latch(0);
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device.controllerPort2->latch(0);
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uint16 joy1 = 0, joy2 = 0, joy3 = 0, joy4 = 0;
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for(uint i = 0; i < 16; i++) {
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uint8 port0 = device.controllerPort1->data();
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uint8 port1 = device.controllerPort2->data();
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joy1 |= (port0 & 1) ? (0x8000 >> i) : 0;
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joy2 |= (port1 & 1) ? (0x8000 >> i) : 0;
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joy3 |= (port0 & 2) ? (0x8000 >> i) : 0;
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joy4 |= (port1 & 2) ? (0x8000 >> i) : 0;
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}
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status.joy1l = joy1;
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status.joy1h = joy1 >> 8;
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status.joy2l = joy2;
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status.joy2h = joy2 >> 8;
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status.joy3l = joy3;
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status.joy3h = joy3 >> 8;
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status.joy4l = joy4;
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status.joy4h = joy4 >> 8;
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}
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