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Introduces some preliminary line length unit tests.

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Thereby fixes one potential issue with load_ toggling.
This commit is contained in:
Thomas Harte
2019-12-28 22:50:34 -05:00
parent 13f11e071a
commit 93f6964d8a
3 changed files with 227 additions and 25 deletions
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Machines/Atari/ST/Video.cpp
+5 -6
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@@ -197,10 +197,6 @@ void Video::advance(HalfCycles duration) {
}
}
// TODO: if I'm asserting that sync and blank override the shifter (but, presumably,
// the shifter keeps shifting), then output_sync and output_blank need to have an effect
// inside the shifter on the temporary register values.
if(horizontal_.sync || vertical_.sync) {
video_stream_.output(run_length, VideoStream::OutputMode::Sync);
} else if(horizontal_.blank || vertical_.blank) {
@@ -295,14 +291,17 @@ void Video::advance(HalfCycles duration) {
x_ += run_length;
integer_duration -= run_length;
// Check horizontal events.
// Check horizontal events; the first six are guaranteed to occur separately.
if(horizontal_timings.reset_blank == x_) horizontal_.blank = false;
else if(horizontal_timings.set_blank == x_) horizontal_.blank = true;
else if(horizontal_timings.reset_enable == x_) horizontal_.enable = false;
else if(horizontal_timings.set_enable == x_) horizontal_.enable = true;
else if(line_length_ - hsync_start == x_) { horizontal_.sync = true; horizontal_.enable = false; }
else if(line_length_ - hsync_end == x_) horizontal_.sync = false;
else if(next_load_toggle_ == x_) {
// next_load_toggle_ is less predictable; test separately because it may coincide
// with one of the above tests.
if(next_load_toggle_ == x_) {
next_load_toggle_ = -1;
load_ ^= true;
load_base_ = x_;