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Corrects S-Video output.

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Thomas Harte 2019-02-12 19:31:12 -05:00
parent 037cbd534e
commit ec8f1157c8
1 changed files with 9 additions and 3 deletions
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12
Outputs/OpenGL/ScanTargetGLSLFragments.cpp
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@ -389,11 +389,17 @@ std::unique_ptr<Shader> ScanTarget::conversion_shader() const {
case DisplayType::SVideo:
fragment_shader +=
// Sample four times over, at proper angle offsets.
"vec2 sample = svideo_sample(textureCoordinates[1], compositeAngle);"
// Sample the S-Video stream once, to obtain luminance.
"vec2 sample = svideo_sample(textureCoordinate, compositeAngle);"
// Split and average chrominance.
"vec2 channels = vec2(0.0, 0.0);"
"vec2 chrominances[4] = vec2[4]("
"textureLod(qamTextureName, qamTextureCoordinates[0], 0).gb,"
"textureLod(qamTextureName, qamTextureCoordinates[1], 0).gb,"
"textureLod(qamTextureName, qamTextureCoordinates[2], 0).gb,"
"textureLod(qamTextureName, qamTextureCoordinates[3], 0).gb"
");"
"vec2 channels = (chrominances[0] + chrominances[1] + chrominances[2] + chrominances[3])*0.5 - vec2(1.0);"
// Apply a colour space conversion to get RGB.
"fragColour3 = lumaChromaToRGB * vec3(sample.r, channels);";