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Adds commentary, shrinks some intermediate texture sizes.

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This commit is contained in:
Thomas Harte 2020-08-30 12:06:29 -04:00
parent 1e1f007bb7
commit bb547610f2
1 changed files with 41 additions and 24 deletions
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65
OSBindings/Mac/Clock Signal/ScanTarget/CSScanTarget.mm
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@ -30,8 +30,8 @@ struct Uniforms {
float cyclesMultiplier;
};
constexpr size_t NumBufferedScans = 2048;
constexpr size_t NumBufferedLines = 2048;
constexpr size_t NumBufferedLines = 500;
constexpr size_t NumBufferedScans = NumBufferedLines * 4;
/// The shared resource options this app would most favour; applied as widely as possible.
constexpr MTLResourceOptions SharedResourceOptionsStandard = MTLResourceCPUCacheModeWriteCombined | MTLResourceStorageModeShared;
@ -58,41 +58,58 @@ constexpr MTLResourceOptions SharedResourceOptionsTexture = MTLResourceCPUCacheM
using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
@implementation CSScanTarget {
// The command queue for the device in use.
id<MTLCommandQueue> _commandQueue;
id<MTLFunction> _vertexShader;
id<MTLFunction> _fragmentShader;
id<MTLRenderPipelineState> _composePipeline;
id<MTLRenderPipelineState> _outputPipeline;
id<MTLRenderPipelineState> _copyPipeline;
id<MTLRenderPipelineState> _clearPipeline;
// Pipelines.
id<MTLRenderPipelineState> _composePipeline; // For rendering to the composition texture.
id<MTLRenderPipelineState> _outputPipeline; // For drawing to the frame buffer.
id<MTLRenderPipelineState> _copyPipeline; // For copying the frame buffer to the visible surface.
id<MTLRenderPipelineState> _clearPipeline; // For applying additional inter-frame clearing (cf. the stencil).
// Buffers.
id<MTLBuffer> _uniformsBuffer;
id<MTLBuffer> _uniformsBuffer; // A static buffer, containing a copy of the Uniforms struct.
id<MTLBuffer> _scansBuffer; // A dynamic buffer, into which the CPU writes Scans for later display.
id<MTLBuffer> _linesBuffer; // A dynamic buffer, into which the CPU writes Lines for later display.
id<MTLBuffer> _scansBuffer;
id<MTLBuffer> _linesBuffer;
id<MTLBuffer> _writeAreaBuffer;
// Textures.
// Textures: the write area.
//
// The write area receives fragments of output from the emulated machine.
// So it is written by the CPU and read by the GPU.
id<MTLTexture> _writeAreaTexture;
size_t _bytesPerInputPixel;
size_t _totalTextureBytes;
id<MTLBuffer> _writeAreaBuffer; // The storage underlying the write-area texture.
size_t _bytesPerInputPixel; // Determines per-pixel sizing within the write-area texture.
size_t _totalTextureBytes; // Holds the total size of the write-area texture.
// Textures: the frame buffer.
//
// When inter-frame blending is in use, the frame buffer contains the most recent output.
// Metal isn't really set up for single-buffered output, so this acts as if it were that
// single buffer. This texture is complete 2d data, copied directly to the display.
id<MTLTexture> _frameBuffer;
MTLRenderPassDescriptor *_frameBufferRenderPass;
MTLRenderPassDescriptor *_frameBufferRenderPass; // The render pass for _drawing to_ the frame buffer.
id<MTLTexture> _compositionTexture;
MTLRenderPassDescriptor *_compositionRenderPass;
// The stencil buffer and the two ways it's used.
// Textures: the stencil.
//
// Scan targets recceive scans, not full frames. Those scans may not cover the entire display,
// either because unlit areas have been omitted or because a sync discrepancy means that the full
// potential vertical or horizontal width of the display isn't used momentarily.
//
// In order to manage inter-frame blending correctly in those cases, a stencil is attached to the
// frame buffer so that a clearing step can darken any pixels that weren't naturally painted during
// any frame.
id<MTLTexture> _frameBufferStencil;
id<MTLDepthStencilState> _drawStencilState; // Always draws, sets stencil to 1.
id<MTLDepthStencilState> _clearStencilState; // Draws only where stencil is 0, clears all to 0.
// The composition pipeline, and whether it's in use.
BOOL _isUsingCompositionPipeline;
// Textures: the composition texture.
//
// If additional temporal processing is required (i.e. for S-Video and colour composite output),
// fragments from the write-area texture are assembled into the composition texture, where they
// properly adjoin their neighbours and everything is converted to a common clock.
id<MTLTexture> _compositionTexture;
MTLRenderPassDescriptor *_compositionRenderPass; // The render pass for _drawing to_ the composition buffer.
BOOL _isUsingCompositionPipeline; // Whether the composition pipeline is in use.
// The scan target in C++-world terms and the non-GPU storage for it.
BufferingScanTarget _scanTarget;