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Restores S-Video through line, as monochrome.

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This commit is contained in:
Thomas Harte 2019-02-09 17:13:43 -05:00
parent eecd4417e7
commit 1cd6d58f17
1 changed files with 4 additions and 18 deletions
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22
Outputs/OpenGL/ScanTargetGLSLFragments.cpp
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@ -320,27 +320,13 @@ std::unique_ptr<Shader> ScanTarget::conversion_shader() const {
case DisplayType::SVideo:
fragment_shader +=
// Sample four times over, at proper angle offsets.
"vec2 samples[4] = vec2[4]("
"svideo_sample(textureCoordinates[0], angles[0]),"
"svideo_sample(textureCoordinates[1], angles[1]),"
"svideo_sample(textureCoordinates[2], angles[2]),"
"svideo_sample(textureCoordinates[3], angles[3])"
");"
"vec4 chrominances = vec4("
"samples[0].y,"
"samples[1].y,"
"samples[2].y,"
"samples[3].y"
");"
"vec2 sample = svideo_sample(textureCoordinates[1], compositeAngle);"
// Split and average chrominance.
"vec2 channels = vec2("
"dot(cos(angles), chrominances),"
"dot(sin(angles), chrominances)"
") * vec2(0.25);"
"vec2 channels = vec2(0.0, 0.0);"
// Apply a colour space conversion to get RGB.
"fragColour3 = lumaChromaToRGB * vec3(samples[1].x, channels);";
"fragColour3 = lumaChromaToRGB * vec3(sample.r, channels);";
break;
case DisplayType::CompositeColour:
@ -593,7 +579,7 @@ std::unique_ptr<Shader> ScanTarget::qam_separation_shader() const {
if(is_svideo) {
vertex_shader +=
"textureCoordinate = vec2(centreClock + textureCoordinateOffsets[0], lineY + 0.5) / textureSize(textureName, 0)";
"textureCoordinate = vec2(centreClock, lineY + 0.5) / textureSize(textureName, 0);";
} else {
vertex_shader +=
"textureCoordinates[0] = vec2(centreClock + textureCoordinateOffsets[0], lineY + 0.5) / textureSize(textureName, 0);"