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Corrected: PAL machines can now be overt in terms of odd/even colour burst.

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This commit is contained in:
Thomas Harte 2021-03-20 23:45:49 -04:00
parent 07a63d62dd
commit 986c4006a6
2 changed files with 7 additions and 6 deletions
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9
Outputs/CRT/CRT.cpp
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@ -32,7 +32,7 @@ void CRT::set_new_timing(int cycles_per_line, int height_of_display, Outputs::Di
phase_numerator_ = 0;
colour_cycle_numerator_ = int64_t(colour_cycle_numerator);
phase_alternates_ = should_alternate;
is_alernate_line_ &= phase_alternates_;
should_be_alternate_line_ &= phase_alternates_;
cycles_per_line_ = cycles_per_line;
const int multiplied_cycles_per_line = cycles_per_line * time_multiplier_;
@ -275,7 +275,7 @@ void CRT::advance_cycles(int number_of_cycles, bool hsync_requested, bool vsync_
// If retrace is starting, update phase if required and mark no colour burst spotted yet.
if(next_horizontal_sync_event == Flywheel::SyncEvent::StartRetrace) {
is_alernate_line_ ^= phase_alternates_;
should_be_alternate_line_ ^= phase_alternates_;
colour_burst_amplitude_ = 0;
}
}
@ -408,18 +408,19 @@ void CRT::output_level(int number_of_cycles) {
output_scan(&scan);
}
void CRT::output_colour_burst(int number_of_cycles, uint8_t phase, uint8_t amplitude) {
void CRT::output_colour_burst(int number_of_cycles, uint8_t phase, bool is_alternate_line, uint8_t amplitude) {
Scan scan;
scan.type = Scan::Type::ColourBurst;
scan.number_of_cycles = number_of_cycles;
scan.phase = phase;
scan.amplitude = amplitude >> 1;
is_alernate_line_ = is_alternate_line;
output_scan(&scan);
}
void CRT::output_default_colour_burst(int number_of_cycles, uint8_t amplitude) {
// TODO: avoid applying a rounding error here?
output_colour_burst(number_of_cycles, uint8_t((phase_numerator_ * 256) / phase_denominator_), amplitude);
output_colour_burst(number_of_cycles, uint8_t((phase_numerator_ * 256) / phase_denominator_), should_be_alternate_line_, amplitude);
}
void CRT::set_immediate_default_phase(float phase) {

4
Outputs/CRT/CRT.hpp
View File

@ -61,7 +61,7 @@ class CRT {
int64_t phase_denominator_ = 1;
int64_t phase_numerator_ = 0;
int64_t colour_cycle_numerator_ = 1;
bool is_alernate_line_ = false, phase_alternates_ = false;
bool is_alernate_line_ = false, phase_alternates_ = false, should_be_alternate_line_ = false;
void advance_cycles(int number_of_cycles, bool hsync_requested, bool vsync_requested, const Scan::Type type, int number_of_samples);
Flywheel::SyncEvent get_next_vertical_sync_event(bool vsync_is_requested, int cycles_to_run_for, int *cycles_advanced);
@ -207,7 +207,7 @@ class CRT {
@param amplitude The amplitude of the colour burst in 1/255ths of the amplitude of the
positive portion of the wave.
*/
void output_colour_burst(int number_of_cycles, uint8_t phase, uint8_t amplitude = DefaultAmplitude);
void output_colour_burst(int number_of_cycles, uint8_t phase, bool is_alternate_line = false, uint8_t amplitude = DefaultAmplitude);
/*! Outputs a colour burst exactly in phase with CRT expectations using the idiomatic amplitude.