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Resolves video timing issues.

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This commit is contained in:
Thomas Harte 2020-11-07 21:28:08 -05:00
parent 228d901253
commit 35ba5fc894
1 changed files with 9 additions and 4 deletions
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13
Machines/Apple/AppleIIgs/Video.cpp
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@ -57,9 +57,13 @@ void VideoBase::advance(Cycles cycles) {
const int row_end = cycles_into_frame_ / CyclesPerLine;
if(row_end == row_start) {
output_row(row_start, column_start, column_end);
if(column_end != column_start) {
output_row(row_start, column_start, column_end);
}
} else {
output_row(row_start, column_start, FinalColumn);
if(column_start != FinalColumn) {
output_row(row_start, column_start, FinalColumn);
}
for(int row = row_start+1; row < row_end; row++) {
output_row(row, 0, FinalColumn);
}
@ -119,6 +123,7 @@ void VideoBase::output_row(int row, int start, int end) {
if(start < blank_ticks && end >= blank_ticks) {
crt_.output_blank(blank_ticks * CyclesPerTick);
start = blank_ticks;
if(start == end) return;
}
// Output left border as far as currently known.
@ -152,8 +157,8 @@ void VideoBase::output_row(int row, int start, int end) {
// TODO: output real border colour.
crt_.output_blank((end_of_period - start) * CyclesPerTick);
start = end_of_period;
if(start == end) return;
// There's no point updating start here; just fall
// through to the end == FinalColumn test.
}
// Output sync if the moment has arrived.