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Reintroduce colour burst.

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This commit is contained in:
Thomas Harte 2024-12-27 09:25:36 -05:00
parent 9670d5f4de
commit e19fe5d0e2
1 changed files with 5 additions and 2 deletions
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7
Machines/Commodore/Plus4/Video.hpp
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@ -237,8 +237,7 @@ public:
if(vertical_sync_ || horizontal_sync_) {
state = OutputState::Sync;
} else if(vertical_blank_ || horizontal_blank_) {
// state = horizontal_burst_ ? OutputState::Burst : OutputState::Blank;
state = OutputState::Blank;
state = horizontal_burst_ ? OutputState::Burst : OutputState::Blank;
} else {
const bool pixel_screen = columns_40_ ? wide_screen_ : narrow_screen_;
state = enable_display_ && pixel_screen ? OutputState::Pixels : OutputState::Border;
@ -441,6 +440,7 @@ public:
case HorizontalEvent::EndOfScreen:
schedule<8>(DelayedEvent::IncrementVerticalLine);
next_vertical_counter_ = video_line_ == eos() ? 0 : ((vertical_counter_ + 1) & 511);
horizontal_burst_ = true;
break;
case HorizontalEvent::EndExternalFetchWindow:
@ -485,6 +485,8 @@ public:
case HorizontalEvent::BeginAttributeFetch:
dma_window_ = true;
horizontal_burst_ = false; // Should be 1 cycle later, if the data sheet is completely accurate.
// Though all other timings work on the assumption that it isn't.
break;
case HorizontalEvent::EndBlank:
@ -590,6 +592,7 @@ private:
bool character_window_ = false;
bool horizontal_blank_ = false;
bool horizontal_sync_ = false;
bool horizontal_burst_ = false;
bool enable_display_ = false;
bool vertical_sub_active_ = false; // Indicates the the 3-bit row counter is active.
bool video_shift_ = false; // Indicates that the shift register is shifting.