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Merge pull request #476 from TomHarte/LongLines

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Increases permissible error in scanline length.
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Thomas Harte 2018-06-19 22:25:37 -04:00 committed by GitHub
commit ad57caed5e
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1 changed files with 10 additions and 2 deletions
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12
Outputs/CRT/CRT.cpp
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@ -42,8 +42,16 @@ void CRT::set_new_timing(unsigned int cycles_per_line, unsigned int height_of_di
// the gist for simple debugging
sync_capacitor_charge_threshold_ = ((vertical_sync_half_lines - 2) * cycles_per_line) >> 1;
// create the two flywheels
horizontal_flywheel_.reset(new Flywheel(multiplied_cycles_per_line, (millisecondsHorizontalRetraceTime * multiplied_cycles_per_line) >> 6, multiplied_cycles_per_line >> 6));
// Create the two flywheels:
//
// The horizontal flywheel has an ideal period of `multiplied_cycles_per_line`, will accept syncs
// within 1/32nd of that (i.e. tolerates 3.125% error) and takes millisecondsHorizontalRetraceTime
// to retrace.
//
// The vertical slywheel has an ideal period of `multiplied_cycles_per_line * height_of_display`,
// will accept syncs within 1/8th of that (i.e. tolerates 12.5% error) and takes scanlinesVerticalRetraceTime
// to retrace.
horizontal_flywheel_.reset(new Flywheel(multiplied_cycles_per_line, (millisecondsHorizontalRetraceTime * multiplied_cycles_per_line) >> 6, multiplied_cycles_per_line >> 5));
vertical_flywheel_.reset(new Flywheel(multiplied_cycles_per_line * height_of_display, scanlinesVerticalRetraceTime * multiplied_cycles_per_line, (multiplied_cycles_per_line * height_of_display) >> 3));
// figure out the divisor necessary to get the horizontal flywheel into a 16-bit range