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Corrects SVideo-as-composite output; the Atari and Vic-20 now both supply svideo.

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This commit is contained in:
Thomas Harte 2018-03-30 13:16:18 -04:00
parent 207d462dbf
commit 163a61dd63
3 changed files with 14 additions and 13 deletions
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11
Components/6560/6560.hpp
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@ -54,14 +54,15 @@ template <class T> class MOS6560 {
audio_generator_(audio_queue_),
speaker_(audio_generator_)
{
crt_->set_composite_sampling_function(
"float composite_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase, float amplitude)"
crt_->set_svideo_sampling_function(
"vec2 svideo_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase)"
"{"
"vec2 yc = texture(texID, coordinate).rg / vec2(255.0);"
"float phaseOffset = 6.283185308 * 2.0 * yc.y;"
"float chroma = cos(phase + phaseOffset);"
"return mix(yc.x, step(yc.y, 0.75) * chroma, amplitude);"
"float phaseOffset = 6.283185308 * 2.0 * yc.y;"
"float chroma = step(yc.y, 0.75) * cos(phase + phaseOffset);"
"return vec2(yc.x, chroma);"
"}");
// default to NTSC

12
Machines/Atari2600/TIA.cpp
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@ -123,20 +123,20 @@ void TIA::set_output_mode(Atari2600::TIA::OutputMode output_mode) {
Outputs::CRT::DisplayType display_type;
if(output_mode == OutputMode::NTSC) {
crt_->set_composite_sampling_function(
"float composite_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase, float amplitude)"
crt_->set_svideo_sampling_function(
"vec2 svideo_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase)"
"{"
"uint c = texture(texID, coordinate).r;"
"uint y = c & 14u;"
"uint iPhase = (c >> 4);"
"float phaseOffset = 6.283185308 * float(iPhase) / 13.0 + 5.074880441076923;"
"return mix(float(y) / 14.0, step(1, iPhase) * cos(phase + phaseOffset), amplitude);"
"return vec2(float(y) / 14.0, step(1, iPhase) * cos(phase + phaseOffset));"
"}");
display_type = Outputs::CRT::DisplayType::NTSC60;
} else {
crt_->set_composite_sampling_function(
"float composite_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase, float amplitude)"
crt_->set_svideo_sampling_function(
"vec2 svideo_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase)"
"{"
"uint c = texture(texID, coordinate).r;"
"uint y = c & 14u;"
@ -145,7 +145,7 @@ void TIA::set_output_mode(Atari2600::TIA::OutputMode output_mode) {
"uint direction = iPhase & 1u;"
"float phaseOffset = float(7u - direction) + (float(direction) - 0.5) * 2.0 * float(iPhase >> 1);"
"phaseOffset *= 6.283185308 / 12.0;"
"return mix(float(y) / 14.0, step(4, (iPhase + 2u) & 15u) * cos(phase + phaseOffset), amplitude);"
"return vec2(float(y) / 14.0, step(4, (iPhase + 2u) & 15u) * cos(phase + phaseOffset));"
"}");
display_type = Outputs::CRT::DisplayType::PAL50;
}

4
Outputs/CRT/Internals/Shaders/IntermediateShader.cpp
View File

@ -180,7 +180,7 @@ std::unique_ptr<IntermediateShader> IntermediateShader::make_svideo_source_shade
fragment_shader
<< rgb_shader <<
"uniform mat3 rgbToLumaChroma;"
"float svideo_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase)"
"vec2 svideo_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase)"
"{"
"vec3 rgbColour = clamp(rgb_sample(texID, coordinate, iCoordinate), vec3(0.0), vec3(1.0));"
"vec3 lumaChromaColour = rgbToLumaChroma * rgbColour;"
@ -194,7 +194,7 @@ std::unique_ptr<IntermediateShader> IntermediateShader::make_svideo_source_shade
"{"
"vec2 sample = svideo_sample(texID, inputPositionsVarying[5], iInputPositionVarying, phaseAndAmplitudeVarying.x);"
"vec2 quadrature = vec2(cos(phaseAndAmplitudeVarying.x), -sin(phaseAndAmplitudeVarying.x));"
"fragColour = vec3(luminance, vec2(0.5) + (chrominance * quadrature));"
"fragColour = vec3(sample.x, vec2(0.5) + (sample.y * quadrature));"
"}";
return make_shader(fragment_shader.str(), true, true);