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Took vertical sync detection logic entirely out of the loop.

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This commit is contained in:
Thomas Harte 2017-03-05 20:17:55 -05:00
parent abd4d2c42a
commit ad73379d1c
2 changed files with 10 additions and 11 deletions
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19
Outputs/CRT/CRT.cpp
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@ -37,7 +37,7 @@ void CRT::set_new_timing(unsigned int cycles_per_line, unsigned int height_of_di
unsigned int multiplied_cycles_per_line = cycles_per_line * time_multiplier_;
// generate timing values implied by the given arbuments
sync_capacitor_charge_threshold_ = ((int)(syncCapacityLineChargeThreshold * multiplied_cycles_per_line) * 3) / 4;
sync_capacitor_charge_threshold_ = ((int)(syncCapacityLineChargeThreshold * cycles_per_line) * 3) / 4;
// create the two flywheels
horizontal_flywheel_.reset(new Flywheel(multiplied_cycles_per_line, (millisecondsHorizontalRetraceTime * multiplied_cycles_per_line) >> 6, multiplied_cycles_per_line >> 6));
@ -113,7 +113,7 @@ Flywheel::SyncEvent CRT::get_next_horizontal_sync_event(bool hsync_is_requested,
#define source_phase() next_run[SourceVertexOffsetOfPhaseTimeAndAmplitude + 0]
#define source_amplitude() next_run[SourceVertexOffsetOfPhaseTimeAndAmplitude + 2]
void CRT::advance_cycles(unsigned int number_of_cycles, bool hsync_requested, bool vsync_requested, const bool vsync_charging, const Scan::Type type)
void CRT::advance_cycles(unsigned int number_of_cycles, bool hsync_requested, bool vsync_requested, const Scan::Type type)
{
std::unique_lock<std::mutex> output_lock = openGL_output_builder_.get_output_lock();
number_of_cycles *= time_multiplier_;
@ -154,13 +154,6 @@ void CRT::advance_cycles(unsigned int number_of_cycles, bool hsync_requested, bo
// horizontal counter appropriately
number_of_cycles -= next_run_length;
// either charge or deplete the vertical retrace capacitor (making sure it stops at 0)
if(vsync_charging)
sync_capacitor_charge_level_ += next_run_length;
else
sync_capacitor_charge_level_ = std::max(sync_capacitor_charge_level_ - (int)next_run_length, 0);
// if(sync_capacitor_charge_level_) printf(":%c %d ", vsync_charging ? '+' : '-', sync_capacitor_charge_level_);
// react to the incoming event...
horizontal_flywheel_->apply_event(next_run_length, (next_run_length == time_until_horizontal_sync_event) ? next_horizontal_sync_event : Flywheel::SyncEvent::None);
vertical_flywheel_->apply_event(next_run_length, (next_run_length == time_until_vertical_sync_event) ? next_vertical_sync_event : Flywheel::SyncEvent::None);
@ -299,7 +292,13 @@ void CRT::output_scan(const Scan *const scan)
// TODO: inspect raw data for potential colour burst if required
sync_period_ = is_receiving_sync_ ? (sync_period_ + scan->number_of_cycles) : 0;
advance_cycles(scan->number_of_cycles, hsync_requested, vsync_requested, this_is_sync, scan->type);
advance_cycles(scan->number_of_cycles, hsync_requested, vsync_requested, scan->type);
// either charge or deplete the vertical retrace capacitor (making sure it stops at 0)
if(this_is_sync)
sync_capacitor_charge_level_ += scan->number_of_cycles;
else
sync_capacitor_charge_level_ = std::max(sync_capacitor_charge_level_ - (int)scan->number_of_cycles, 0);
}
/*

2
Outputs/CRT/CRT.hpp
View File

@ -66,7 +66,7 @@ class CRT {
bool is_alernate_line_, phase_alternates_;
// the outer entry point for dispatching output_sync, output_blank, output_level and output_data
void advance_cycles(unsigned int number_of_cycles, bool hsync_requested, bool vsync_requested, const bool vsync_charging, const Scan::Type type);
void advance_cycles(unsigned int number_of_cycles, bool hsync_requested, bool vsync_requested, const Scan::Type type);
// the inner entry point that determines whether and when the next sync event will occur within
// the current output window