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Restricts S-Video processing to updated lines.
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Thomas Harte
parent
245f2654f0
commit
9e2bf2af7e
@ -207,6 +207,11 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
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id<MTLComputePipelineState> _separatedLumaState;
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NSUInteger _lineBufferPixelsPerLine;
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size_t _lineOffsetBuffer;
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id<MTLBuffer> _lineOffsetBuffers[NumBufferedLines]; // Allocating NumBufferedLines buffers ensures these can't possibly be exhausted;
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// for this list to be exhausted there'd have to be more draw calls in flight than
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// there are lines for them to operate upon.
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// The scan target in C++-world terms and the non-GPU storage for it.
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BufferingScanTarget _scanTarget;
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BufferingScanTarget::LineMetadata _lineMetadataBuffer[NumBufferedLines];
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@ -266,6 +271,13 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
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depthStencilDescriptor.frontFaceStencil.stencilFailureOperation = MTLStencilOperationReplace;
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_clearStencilState = [view.device newDepthStencilStateWithDescriptor:depthStencilDescriptor];
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// Allocate a large number of single-int buffers, for supplying offsets to the compute shaders.
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// There's a ridiculous amount of overhead in this, but it avoids allocations during drawing,
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// and a single int per instance is all I need.
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for(size_t c = 0; c < NumBufferedLines; ++c) {
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_lineOffsetBuffers[c] = [_view.device newBufferWithLength:sizeof(int) options:SharedResourceOptionsStandard];
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}
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// Ensure the is-drawing flag is initially clear.
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_isDrawing.clear();
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}
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@ -667,7 +679,12 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
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[encoder endEncoding];
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}
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- (void)dispatchComputeCommandEncoder:(id<MTLComputeCommandEncoder>)encoder pipelineState:(id<MTLComputePipelineState>)pipelineState width:(NSUInteger)width height:(NSUInteger)height {
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- (void)dispatchComputeCommandEncoder:(id<MTLComputeCommandEncoder>)encoder pipelineState:(id<MTLComputePipelineState>)pipelineState width:(NSUInteger)width height:(NSUInteger)height offset:(size_t)offset {
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// Store and apply the offset.
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*(reinterpret_cast<int *>(_lineOffsetBuffers[_lineOffsetBuffer].contents)) = int(offset);
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[encoder setBuffer:_lineOffsetBuffers[_lineOffsetBuffer] offset:0 atIndex:1];
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_lineOffsetBuffer = (_lineOffsetBuffer + 1) % NumBufferedLines;
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// This follows the recommendations at https://developer.apple.com/documentation/metal/calculating_threadgroup_and_grid_sizes ;
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// I currently have no independent opinion whatsoever.
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const MTLSize threadsPerThreadgroup = MTLSizeMake(
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@ -677,6 +694,7 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
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);
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const MTLSize threadsPerGrid = MTLSizeMake(width, height, 1);
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// Set the pipeline state and dispatch the drawing. Which may slightly overdraw.
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[encoder setComputePipelineState:pipelineState];
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[encoder dispatchThreads:threadsPerGrid threadsPerThreadgroup:threadsPerThreadgroup];
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}
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@ -740,29 +758,37 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
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// Build the composition buffer.
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[self composeOutputArea:outputArea commandBuffer:commandBuffer];
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// Filter to the finalised line texture.
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id<MTLComputeCommandEncoder> computeEncoder = [commandBuffer computeCommandEncoder];
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[computeEncoder setTexture:_compositionTexture atIndex:0];
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[computeEncoder setTexture:_finalisedLineTexture atIndex:1];
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[computeEncoder setBuffer:_uniformsBuffer offset:0 atIndex:0];
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if(outputArea.end.line != outputArea.start.line) {
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// Filter to the finalised line texture.
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id<MTLComputeCommandEncoder> computeEncoder = [commandBuffer computeCommandEncoder];
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[computeEncoder setTexture:_compositionTexture atIndex:0];
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[computeEncoder setTexture:_finalisedLineTexture atIndex:1];
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[computeEncoder setBuffer:_uniformsBuffer offset:0 atIndex:0];
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// TODO: limit processed area to those lines that are actually in use.
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[self dispatchComputeCommandEncoder:computeEncoder pipelineState:_finalisedLineState width:_lineBufferPixelsPerLine height:NumBufferedLines];
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[computeEncoder endEncoding];
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// Output lines, broken up by frame.
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size_t startLine = outputArea.start.line;
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size_t line = outputArea.start.line;
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while(line != outputArea.end.line) {
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if(_lineMetadataBuffer[line].is_first_in_frame && _lineMetadataBuffer[line].previous_frame_was_complete) {
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[self outputFrom:startLine to:line commandBuffer:commandBuffer];
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[self outputFrameCleanerToCommandBuffer:commandBuffer];
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startLine = line;
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if(outputArea.end.line > outputArea.start.line) {
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[self dispatchComputeCommandEncoder:computeEncoder pipelineState:_finalisedLineState width:_lineBufferPixelsPerLine height:outputArea.end.line - outputArea.start.line offset:outputArea.start.line];
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} else {
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[self dispatchComputeCommandEncoder:computeEncoder pipelineState:_finalisedLineState width:_lineBufferPixelsPerLine height:NumBufferedLines - outputArea.start.line offset:outputArea.start.line];
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if(outputArea.end.line) {
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[self dispatchComputeCommandEncoder:computeEncoder pipelineState:_finalisedLineState width:_lineBufferPixelsPerLine height:outputArea.end.line offset:0];
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}
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}
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line = (line + 1) % NumBufferedLines;
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[computeEncoder endEncoding];
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// Output lines, broken up by frame.
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size_t startLine = outputArea.start.line;
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size_t line = outputArea.start.line;
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while(line != outputArea.end.line) {
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if(_lineMetadataBuffer[line].is_first_in_frame && _lineMetadataBuffer[line].previous_frame_was_complete) {
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[self outputFrom:startLine to:line commandBuffer:commandBuffer];
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[self outputFrameCleanerToCommandBuffer:commandBuffer];
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startLine = line;
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}
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line = (line + 1) % NumBufferedLines;
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}
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[self outputFrom:startLine to:outputArea.end.line commandBuffer:commandBuffer];
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}
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[self outputFrom:startLine to:outputArea.end.line commandBuffer:commandBuffer];
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} break;
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}
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@ -7,6 +7,7 @@
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//
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#include <metal_stdlib>
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using namespace metal;
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// TODO: I'm being very loose, so far, in use of alpha. Sometimes it's 0.64, somtimes its 1.0.
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@ -402,24 +403,25 @@ fragment float4 interpolateFragment(CopyInterpolator vert [[stage_in]], texture2
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kernel void filterChromaKernel( texture2d<float, access::read> inTexture [[texture(0)]],
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texture2d<float, access::write> outTexture [[texture(1)]],
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uint2 gid [[thread_position_in_grid]],
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constant Uniforms &uniforms [[buffer(0)]]) {
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constant Uniforms &uniforms [[buffer(0)]],
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constant int &offset [[buffer(1)]]) {
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constexpr float4 moveToZero = float4(0.0f, 0.5f, 0.5f, 0.0f);
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const float4 rawSamples[] = {
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inTexture.read(gid) - moveToZero,
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inTexture.read(gid + uint2(1, 0)) - moveToZero,
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inTexture.read(gid + uint2(2, 0)) - moveToZero,
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inTexture.read(gid + uint2(3, 0)) - moveToZero,
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inTexture.read(gid + uint2(4, 0)) - moveToZero,
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inTexture.read(gid + uint2(5, 0)) - moveToZero,
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inTexture.read(gid + uint2(6, 0)) - moveToZero,
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inTexture.read(gid + uint2(7, 0)) - moveToZero,
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inTexture.read(gid + uint2(8, 0)) - moveToZero,
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inTexture.read(gid + uint2(9, 0)) - moveToZero,
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inTexture.read(gid + uint2(10, 0)) - moveToZero,
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inTexture.read(gid + uint2(11, 0)) - moveToZero,
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inTexture.read(gid + uint2(12, 0)) - moveToZero,
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inTexture.read(gid + uint2(13, 0)) - moveToZero,
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inTexture.read(gid + uint2(14, 0)) - moveToZero,
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inTexture.read(gid + uint2(0, offset)) - moveToZero,
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inTexture.read(gid + uint2(1, offset)) - moveToZero,
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inTexture.read(gid + uint2(2, offset)) - moveToZero,
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inTexture.read(gid + uint2(3, offset)) - moveToZero,
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inTexture.read(gid + uint2(4, offset)) - moveToZero,
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inTexture.read(gid + uint2(5, offset)) - moveToZero,
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inTexture.read(gid + uint2(6, offset)) - moveToZero,
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inTexture.read(gid + uint2(7, offset)) - moveToZero,
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inTexture.read(gid + uint2(8, offset)) - moveToZero,
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inTexture.read(gid + uint2(9, offset)) - moveToZero,
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inTexture.read(gid + uint2(10, offset)) - moveToZero,
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inTexture.read(gid + uint2(11, offset)) - moveToZero,
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inTexture.read(gid + uint2(12, offset)) - moveToZero,
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inTexture.read(gid + uint2(13, offset)) - moveToZero,
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inTexture.read(gid + uint2(14, offset)) - moveToZero,
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};
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#define Sample(x, y) uniforms.firCoefficients[y] * rawSamples[x].rgb
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@ -429,5 +431,5 @@ kernel void filterChromaKernel( texture2d<float, access::read> inTexture [[textu
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Sample(8, 6) + Sample(9, 5) + Sample(10, 4) + Sample(11, 3) + Sample(12, 2) + Sample(13, 1) + Sample(14, 0);
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#undef Sample
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outTexture.write(float4(uniforms.toRGB * colour, 1.0f), gid + uint2(7, 0));
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outTexture.write(float4(uniforms.toRGB * colour, 1.0f), gid + uint2(7, offset));
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}
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