6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2025-02-27 00:30:26 +00:00
Code Issues Projects Releases Wiki Activity

Limit vertical visibility.

Browse Source
This commit is contained in:
Thomas Harte 2024-09-30 13:35:28 -04:00
parent e5ff4c65b7
commit e650f3772a
1 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
Components/6845/CRTC6845.hpp
View File

@ -203,7 +203,7 @@ template <class BusHandlerT, Personality personality, CursorType cursor_type> cl
// bus_state_.cursor = is_cursor_line_ &&
// bus_state_.refresh_address == layout_.cursor_address;
bus_state_.display_enable = character_is_visible_; // TODO: && row_visible_ or somesuch
bus_state_.display_enable = character_is_visible_ && line_is_visible_;
// TODO: considate the two below.
perform_bus_cycle_phase1();
@ -279,8 +279,10 @@ template <class BusHandlerT, Personality personality, CursorType cursor_type> cl
row_counter_ = next_row_counter_;
if(new_frame) {
next_row_counter_ = 0;
is_first_scanline_ = true;
} else {
next_row_counter_ = row_end_hit && character_total_hit ? (next_row_counter_ + 1) : next_row_counter_;
is_first_scanline_ &= !row_end_hit;
}
// Sync.
@ -300,6 +302,13 @@ template <class BusHandlerT, Personality personality, CursorType cursor_type> cl
}
}
if(is_first_scanline_) {
line_is_visible_ = true;
} else if(line_is_visible_ && row_counter_ == layout_.vertical.displayed) {
line_is_visible_ = false;
// ++field_counter_;
}
//
// Addressing.
//
@ -482,7 +491,7 @@ template <class BusHandlerT, Personality personality, CursorType cursor_type> cl
uint8_t character_counter_ = 0;
uint8_t row_counter_ = 0, next_row_counter_ = 0;;
bool character_is_visible_ = false, line_is_visible_ = false;
bool character_is_visible_ = false, line_is_visible_ = false, is_first_scanline_ = false;
int hsync_counter_ = 0;
int vsync_counter_ = 0;