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Makes the TMS a sequence-point-generating JustInTimeActor.

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This commit is contained in:
Thomas Harte
2021-04-05 21:02:37 -04:00
parent bd1ea5740a
commit 1266bbb224
7 changed files with 33 additions and 40 deletions
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14
Machines/MasterSystem/MasterSystem.cpp
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@@ -214,7 +214,9 @@ class ConcreteMachine:
}
forceinline HalfCycles perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
vdp_ += cycle.length;
if(vdp_ += cycle.length) {
z80_.set_interrupt_line(vdp_->get_interrupt_line(), vdp_.last_sequence_point_overrun());
}
time_since_sn76489_update_ += cycle.length;
if(cycle.is_terminal()) {
@@ -266,7 +268,6 @@ class ConcreteMachine:
case 0x80: case 0x81:
*cycle.value = vdp_->read(address);
z80_.set_interrupt_line(vdp_->get_interrupt_line());
time_until_interrupt_ = vdp_->get_time_until_interrupt();
break;
case 0xc0: {
if(memory_control_ & 0x4) {
@@ -330,7 +331,6 @@ class ConcreteMachine:
case 0x80: case 0x81: // i.e. ports 0x80–0xbf.
vdp_->write(address, *cycle.value);
z80_.set_interrupt_line(vdp_->get_interrupt_line());
time_until_interrupt_ = vdp_->get_time_until_interrupt();
break;
case 0xc1: case 0xc0: // i.e. ports 0xc0–0xff.
if(has_fm_audio_) {
@@ -374,13 +374,6 @@ class ConcreteMachine:
}
}
if(time_until_interrupt_ > 0) {
time_until_interrupt_ -= cycle.length;
if(time_until_interrupt_ <= HalfCycles(0)) {
z80_.set_interrupt_line(true, time_until_interrupt_);
}
}
// The pause button is debounced and takes effect only one line before pixels
// begin; time_until_debounce_ keeps track of the time until then.
time_until_debounce_ -= cycle.length;
@@ -505,7 +498,6 @@ class ConcreteMachine:
bool reset_is_pressed_ = false, pause_is_pressed_ = false;
HalfCycles time_since_sn76489_update_;
HalfCycles time_until_interrupt_;
HalfCycles time_until_debounce_;
uint8_t ram_[8*1024];