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Avoid missed interrupts on wraparound.

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This commit is contained in:
Thomas Harte 2024-08-26 21:13:49 -04:00
parent 12846317cb
commit b5932edff3
1 changed files with 20 additions and 11 deletions
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31
Machines/Acorn/Electron/Video.cpp
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@ -237,18 +237,27 @@ void VideoOutput::run_for(const Cycles cycles) {
const auto start_position = output_position_;
output_position_ = (output_position_ + number_of_cycles) % cycles_per_frame;
if(
(start_position < real_time_clock_interrupt_1 && output_position_ >= real_time_clock_interrupt_1) ||
(start_position < real_time_clock_interrupt_2 && output_position_ >= real_time_clock_interrupt_2)
) {
interrupts_ = Electron::Interrupt(interrupts_ | Electron::Interrupt::RealTimeClock);
}
const auto test_range = [&](int start, int end) {
if(
(start < real_time_clock_interrupt_1 && end >= real_time_clock_interrupt_1) ||
(start < real_time_clock_interrupt_2 && end >= real_time_clock_interrupt_2)
) {
interrupts_ = Electron::Interrupt(interrupts_ | Electron::Interrupt::RealTimeClock);
}
if(
(start_position < display_end_interrupt_1 && output_position_ >= display_end_interrupt_1) ||
(start_position < display_end_interrupt_2 && output_position_ >= display_end_interrupt_2)
) {
interrupts_ = Electron::Interrupt(interrupts_ | Electron::Interrupt::DisplayEnd);
if(
(start < display_end_interrupt_1 && end >= display_end_interrupt_1) ||
(start < display_end_interrupt_2 && end >= display_end_interrupt_2)
) {
interrupts_ = Electron::Interrupt(interrupts_ | Electron::Interrupt::DisplayEnd);
}
};
if(output_position_ >= start_position) {
test_range(start_position, output_position_);
} else {
test_range(start_position, cycles_per_frame);
test_range(0, output_position_);
}
while(number_of_cycles) {