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Corrects calculation of intermediate buffer width multiplier.

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Specifically: I had failed to factor in that the multiplied-up input frequency might be less than than the full width of the bitmap.

The Atari and MSX in particular now look much better.
This commit is contained in:
Thomas Harte 2018-01-15 16:52:40 -05:00
parent 93ece2aec7
commit 23c34a8c14
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_);
}
/*!
@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 {
return static_cast<float>(colour_cycle_numerator_ * 8) / 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() {