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Increases documentation slightly.

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This commit is contained in:
Thomas Harte 2018-09-09 17:17:38 -04:00
parent 3a3dec92c7
commit 4c8781c762
1 changed files with 4 additions and 0 deletions
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4
Outputs/CRT/Internals/Shaders/IntermediateShader.cpp
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@ -240,10 +240,14 @@ std::unique_ptr<IntermediateShader> IntermediateShader::make_chroma_luma_separat
"texture(texID, inputPositionsVarying[5]).r,"
"texture(texID, inputPositionsVarying[6]).r"
");"
// calculate luminance as either the straight average of the samples, if a colour subcarrier
// was present, or else a weighted sample around the third sample if not.
"float luminance = mix(dot(samples, vec4(0.25)), dot(samples, vec4(0.0, 0.16, 0.66, 0.16)), step(phaseAndAmplitudeVarying.z, 0.0));"
// define chroma to be whatever was here, minus luma
"float chrominance = 0.5 * (samples.z - luminance) * phaseAndAmplitudeVarying.z;"
// scale luminance up to the range [0, 1)
"luminance /= (1.0 - abs(phaseAndAmplitudeVarying.y));"
// split choma colours here, as the most direct place, writing out