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Starts upon a macro-oriented means of RGB input function generation.

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Thomas Harte 2020-08-10 22:03:39 -04:00
parent b9309268ba
commit 4b55df1cb4
1 changed files with 19 additions and 2 deletions
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21
OSBindings/Mac/Clock Signal/ScanTarget/ScanTarget.metal
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@ -142,11 +142,28 @@ fragment float4 compositeSampleLuminance8Phase8(SourceInterpolator vert [[stage_
}
// All the RGB formats can produce RGB, composite or S-Video.
//
// Note on the below: in Metal you may not call a fragment function. Also I can find no
// functioning way to offer a templated fragment function. So I don't currently know how
// I would avoid the mess below.
fragment float4 sampleRed8Green8Blue8(SourceInterpolator vert [[stage_in]], texture2d<float> texture [[texture(0)]]) {
return float4(texture.sample(standardSampler, vert.textureCoordinates));
float3 convertRed8Green8Blue8(SourceInterpolator vert, texture2d<float> texture) {
return float3(texture.sample(standardSampler, vert.textureCoordinates));
}
#define DeclareShaders(name) \
fragment float4 sample##name(SourceInterpolator vert [[stage_in]], texture2d<float> texture [[texture(0)]]) { \
return float4(convert##name(vert, texture), 1.0); \
} \
\
fragment float4 svideoSample##name(SourceInterpolator vert [[stage_in]], texture2d<float> texture [[texture(0)]]) { \
const auto colour = convert##name(vert, texture); \
return float4(colour, 1.0); \
}
// TODO: a colour-space conversion matrix is required to proceed.
DeclareShaders(Red8Green8Blue8)
fragment float4 sampleRed1Green1Blue1(SourceInterpolator vert [[stage_in]], texture2d<ushort> texture [[texture(0)]]) {
const auto sample = texture.sample(standardSampler, vert.textureCoordinates).r;
return float4(sample&4, sample&2, sample&1, 1.0);