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Take a swing at vertical sync.

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This commit is contained in:
Thomas Harte 2024-09-27 21:14:57 -04:00
parent 432854aeb5
commit 7817b23857
1 changed files with 14 additions and 6 deletions
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20
Components/6845/CRTC6845.hpp
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@ -190,6 +190,7 @@ template <class BusHandlerT, Personality personality, CursorType cursor_type> cl
uint8_t next_line_counter_ = 0;
bool adjustment_in_progress_ = false;
uint16_t next_row_address_ = 0;
bool odd_field_ = false;
void run_for(Cycles cycles) {
auto cyles_remaining = cycles.as_integral();
@ -276,13 +277,20 @@ template <class BusHandlerT, Personality personality, CursorType cursor_type> cl
next_row_address_ = bus_state_.row_address;
}
// Sync. [TODO]
const bool vsync_hit = line_counter_ == layout_.vertical.start_sync;
if(character_total_hit) {
if(vsync_hit) {
vsync_counter_ = 0;
// Sync.
const bool vsync_horizontal =
(!odd_field_ && !character_counter_) ||
(odd_field_ && character_counter_ == (layout_.horizontal.total >> 1));
if(vsync_horizontal) {
if(line_counter_ == layout_.vertical.start_sync || bus_state_.vsync) {
bus_state_.vsync = true;
vsync_counter_ = (vsync_counter_ + 1) & 0xf;
} else {
++vsync_counter_;
vsync_counter_ = 0;
}
if(vsync_counter_ == layout_.vertical.sync_lines) {
bus_state_.vsync = false;
}
}