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Improves commentary.

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This commit is contained in:
Thomas Harte 2020-09-15 22:21:05 -04:00
parent 5651ef606d
commit 69d21daaa3
1 changed files with 2 additions and 2 deletions
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4
Outputs/CRT/CRT.cpp
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@ -194,8 +194,8 @@ Outputs::Display::ScanTarget::Scan::EndPoint CRT::end_point(uint16_t data_offset
end_point.y = uint16_t(vertical_flywheel_->get_current_output_position() / vertical_flywheel_output_divider_);
end_point.data_offset = data_offset;
// TODO: this is a workaround for the limited precision that can be posted onwards;
// it'd be better to make time_multiplier_ an explicit modal and just not divide by it.
// Ensure .composite_angle is sampled at the location indicated by .cycles_since_end_of_horizontal_retrace.
// TODO: I could supply time_multiplier_ as a modal and just not round .cycles_since_end_of_horizontal_retrace. Would that be better?
const auto lost_precision = cycles_since_horizontal_sync_ % time_multiplier_;
end_point.composite_angle = int16_t(((phase_numerator_ - lost_precision * colour_cycle_numerator_) << 6) / phase_denominator_) * (is_alernate_line_ ? -1 : 1);
end_point.cycles_since_end_of_horizontal_retrace = uint16_t(cycles_since_horizontal_sync_ / time_multiplier_);