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Shifts S-Video processing into the compute shader.

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This commit is contained in:
Thomas Harte 2020-09-01 20:37:11 -04:00
parent 67ca298a72
commit 245f2654f0
2 changed files with 44 additions and 7 deletions
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4
OSBindings/Mac/Clock Signal/ScanTarget/CSScanTarget.mm
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@ -369,7 +369,7 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
// The finalised texture will definitely exist.
if(!_finalisedLineTexture) {
_finalisedLineTexture = [_view.device newTextureWithDescriptor:lineTextureDescriptor];
_finalisedLineState = [_view.device newComputePipelineStateWithFunction:[library newFunctionWithName:@"copyKernel"] error:nil];
_finalisedLineState = [_view.device newComputePipelineStateWithFunction:[library newFunctionWithName:@"filterChromaKernel"] error:nil];
}
// A luma separation texture will exist only for composite colour.
@ -581,7 +581,7 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
pipelineDescriptor.vertexFunction = [library newFunctionWithName:_pipeline == Pipeline::DirectToDisplay ? @"scanToDisplay" : @"lineToDisplay"];
if(_pipeline != Pipeline::DirectToDisplay) {
pipelineDescriptor.fragmentFunction = [library newFunctionWithName:isSVideoOutput ? @"filterSVideoFragment" : @"filterCompositeFragment"];
pipelineDescriptor.fragmentFunction = [library newFunctionWithName:@"copyFragment"];
} else {
const bool isRGBOutput = modals.display_type == Outputs::Display::DisplayType::RGB;
pipelineDescriptor.fragmentFunction =

47
OSBindings/Mac/Clock Signal/ScanTarget/ScanTarget.metal
View File

@ -48,6 +48,10 @@ constexpr sampler standardSampler( coord::pixel,
address::clamp_to_edge, // Although arbitrary, stick with this address mode for compatibility all the way to MTLFeatureSet_iOS_GPUFamily1_v1.
filter::nearest);
constexpr sampler linearSampler( coord::pixel,
address::clamp_to_edge, // Although arbitrary, stick with this address mode for compatibility all the way to MTLFeatureSet_iOS_GPUFamily1_v1.
filter::linear);
}
// MARK: - Structs used for receiving data from the emulation.
@ -101,6 +105,8 @@ float2 textureLocation(constant Scan *scan, float offset, constant Uniforms &) {
scan->dataY);
}
// TODO: add 0.5f to the y coordinates above to ensure the middle of each line is hit?
template <typename Input> SourceInterpolator toDisplay(
constant Uniforms &uniforms [[buffer(1)]],
constant Input *inputs [[buffer(0)]],
@ -385,12 +391,43 @@ fragment float4 filterCompositeFragment(SourceInterpolator vert [[stage_in]], te
return applyFilter<true>(vert, texture, uniforms);
}
fragment float4 interpolateFragment(CopyInterpolator vert [[stage_in]], texture2d<float> texture [[texture(0)]]) {
return texture.sample(linearSampler, vert.textureCoordinates);
}
// MARK: - Kernel functions
// TEST FUNCTION. Just copies from input to output.
kernel void copyKernel( texture2d<float, access::read> inTexture [[texture(0)]],
texture2d<float, access::write> outTexture [[texture(1)]],
uint2 gid [[thread_position_in_grid]],
constant Uniforms &uniforms [[buffer(0)]]) {
outTexture.write(inTexture.read(gid), gid);
kernel void filterChromaKernel( texture2d<float, access::read> inTexture [[texture(0)]],
texture2d<float, access::write> outTexture [[texture(1)]],
uint2 gid [[thread_position_in_grid]],
constant Uniforms &uniforms [[buffer(0)]]) {
constexpr float4 moveToZero = float4(0.0f, 0.5f, 0.5f, 0.0f);
const float4 rawSamples[] = {
inTexture.read(gid) - moveToZero,
inTexture.read(gid + uint2(1, 0)) - moveToZero,
inTexture.read(gid + uint2(2, 0)) - moveToZero,
inTexture.read(gid + uint2(3, 0)) - moveToZero,
inTexture.read(gid + uint2(4, 0)) - moveToZero,
inTexture.read(gid + uint2(5, 0)) - moveToZero,
inTexture.read(gid + uint2(6, 0)) - moveToZero,
inTexture.read(gid + uint2(7, 0)) - moveToZero,
inTexture.read(gid + uint2(8, 0)) - moveToZero,
inTexture.read(gid + uint2(9, 0)) - moveToZero,
inTexture.read(gid + uint2(10, 0)) - moveToZero,
inTexture.read(gid + uint2(11, 0)) - moveToZero,
inTexture.read(gid + uint2(12, 0)) - moveToZero,
inTexture.read(gid + uint2(13, 0)) - moveToZero,
inTexture.read(gid + uint2(14, 0)) - moveToZero,
};
#define Sample(x, y) uniforms.firCoefficients[y] * rawSamples[x].rgb
const float3 colour =
Sample(0, 0) + Sample(1, 1) + Sample(2, 2) + Sample(3, 3) + Sample(4, 4) + Sample(5, 5) + Sample(6, 6) +
Sample(7, 7) +
Sample(8, 6) + Sample(9, 5) + Sample(10, 4) + Sample(11, 3) + Sample(12, 2) + Sample(13, 1) + Sample(14, 0);
#undef Sample
outTexture.write(float4(uniforms.toRGB * colour, 1.0f), gid + uint2(7, 0));
}