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Picks a phase for the TMS empirically.

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Thomas Harte 2018-03-03 13:53:00 -05:00
parent 35b18d58af
commit 705d53cc21
3 changed files with 18 additions and 0 deletions
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6
Components/9918/9918.cpp
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@ -99,6 +99,12 @@ TMS9918::TMS9918(Personality p) {
crt_->set_output_device(Outputs::CRT::OutputDevice::Monitor);
crt_->set_visible_area(Outputs::CRT::Rect(0.055f, 0.025f, 0.9f, 0.9f));
crt_->set_input_gamma(2.8f);
// The TMS remains in-phase with the NTSC colour clock; this is an empirical measurement
// intended to produce the correct relationship between the hard edges between pixels and
// the colour clock. It was eyeballed rather than derived from any knowledge of the TMS
// colour burst generator because I've yet to find any.
crt_->set_immediate_default_phase(0.85f);
}
Outputs::CRT::CRT *TMS9918::get_crt() {

5
Outputs/CRT/CRT.cpp
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@ -379,6 +379,11 @@ void CRT::output_default_colour_burst(unsigned int number_of_cycles) {
output_colour_burst(number_of_cycles, static_cast<uint8_t>((phase_numerator_ * 256) / phase_denominator_ + (is_alernate_line_ ? 128 : 0)));
}
void CRT::set_immediate_default_phase(float phase) {
phase = fmodf(phase, 1.0f);
phase_numerator_ = static_cast<unsigned int>(phase * static_cast<float>(phase_denominator_));
}
void CRT::output_data(unsigned int number_of_cycles, unsigned int source_divider) {
openGL_output_builder_.texture_builder.reduce_previous_allocation_to(number_of_cycles / source_divider);
Scan scan;

7
Outputs/CRT/CRT.hpp
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@ -210,6 +210,13 @@ class CRT {
*/
void output_default_colour_burst(unsigned int number_of_cycles);
/*! Sets the current phase of the colour subcarrier used by output_default_colour_burst.
@param phase The normalised instantaneous phase — 0.0f is the start of a colour cycle, 1.0f is the
end of a colour cycle, 0.25f is a quarter of the way through a colour cycle, etc.
*/
void set_immediate_default_phase(float phase);
/*! Attempts to allocate the given number of output samples for writing.
The beginning of the most recently allocated area is used as the start