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Merge pull request #337 from TomHarte/DoublePhase

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Corrects calculation of intermediate buffer width multiplier.
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Thomas Harte 2018-01-15 13:57:26 -08:00 committed by GitHub
commit c187c5a637
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1 changed files with 9 additions and 1 deletions
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10
Outputs/CRT/Internals/CRTOpenGL.cpp
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@ -412,8 +412,16 @@ void OpenGLOutputBuilder::set_gamma() {
if(output_shader_program_) output_shader_program_->set_gamma_ratio(gamma_); if(output_shader_program_) output_shader_program_->set_gamma_ratio(gamma_);
} }
/*!
@returns The multiplier to apply to x positions received at the shader in order to produce locations in the intermediate
texture. Intermediate textures are in phase with the composite signal, so this is a function of (i) composite frequency
(determining how much of the texture adds up to a single line); and (ii) input frequency (determining what the input
positions mean as a fraction of a line).
*/
float OpenGLOutputBuilder::get_composite_output_width() const { float OpenGLOutputBuilder::get_composite_output_width() const {
return (static_cast<float>(colour_cycle_numerator_) * 4.0f) / static_cast<float>(colour_cycle_denominator_ * IntermediateBufferWidth); return
(static_cast<float>(colour_cycle_numerator_ * 4) / static_cast<float>(colour_cycle_denominator_ * IntermediateBufferWidth)) *
(static_cast<float>(IntermediateBufferWidth) / static_cast<float>(cycles_per_line_));
} }
void OpenGLOutputBuilder::set_output_shader_width() { void OpenGLOutputBuilder::set_output_shader_width() {