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Seemingly proves that proper geometry is reaching Metal by drawing scans.

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No in-buffer accumulation yet, but this is progress. If I can add accumulation and stencil clearing, I'm not doing badly.
This commit is contained in:
Thomas Harte 2020-08-08 23:11:44 -04:00
parent df89a8771c
commit e340685a99
1 changed files with 31 additions and 35 deletions
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66
OSBindings/Mac/Clock Signal/ScanTarget/CSScanTarget.mm
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@ -8,6 +8,7 @@
#import "CSScanTarget.h"
#include <atomic>
#import <Metal/Metal.h>
#include "BufferingScanTarget.hpp"
@ -22,6 +23,8 @@ struct Uniforms {
constexpr size_t NumBufferedScans = 2048;
constexpr size_t NumBufferedLines = 2048;
#define uniforms() reinterpret_cast<Uniforms *>(_uniformsBuffer.contents)
}
using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
@ -40,12 +43,10 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
id<MTLBuffer> _linesBuffer;
id<MTLBuffer> _writeAreaBuffer;
// Current uniforms.
Uniforms _uniforms;
// The scan target in C++-world terms and the non-GPU storage for it.
BufferingScanTarget _scanTarget;
BufferingScanTarget::LineMetadata _lineMetadataBuffer[NumBufferedLines];
std::atomic_bool _isDrawing;
}
- (nonnull instancetype)initWithView:(nonnull MTKView *)view {
@ -53,13 +54,10 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
if(self) {
_commandQueue = [view.device newCommandQueue];
// Allocate space for uniforms and FOR TEST PURPOSES set some.
_uniformsBuffer = [view.device newBufferWithLength:16 options:MTLResourceCPUCacheModeWriteCombined];
_uniforms.scale[0] = 1024;
_uniforms.scale[1] = 1024;
_uniforms.lineWidth = 1.0f / 312.0f;
_uniforms.aspectRatioMultiplier = 1.0f;
[self setUniforms];
// Allocate space for uniforms.
_uniformsBuffer = [view.device
newBufferWithLength:sizeof(Uniforms)
options:MTLResourceCPUCacheModeWriteCombined | MTLResourceStorageModeShared];
// Allocate buffers for scans and lines and for the write area texture.
_scansBuffer = [view.device
@ -77,9 +75,6 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
_scanTarget.set_line_buffer(reinterpret_cast<BufferingScanTarget::Line *>(_linesBuffer.contents), _lineMetadataBuffer, NumBufferedLines);
_scanTarget.set_scan_buffer(reinterpret_cast<BufferingScanTarget::Scan *>(_scansBuffer.contents), NumBufferedScans);
// TEST ONLY: set some test data.
[self setTestScans];
// Generate TEST pipeline.
id<MTLLibrary> library = [view.device newDefaultLibrary];
MTLRenderPipelineDescriptor *pipelineDescriptor = [[MTLRenderPipelineDescriptor alloc] init];
@ -92,25 +87,6 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
return self;
}
- (void)setUniforms {
memcpy(_uniformsBuffer.contents, &_uniforms, sizeof(Uniforms));
}
- (void)setTestScans {
BufferingScanTarget::Scan scans[2];
scans[0].scan.end_points[0].x = 0;
scans[0].scan.end_points[0].y = 0;
scans[0].scan.end_points[1].x = 1024;
scans[0].scan.end_points[1].y = 256;
scans[1].scan.end_points[0].x = 0;
scans[1].scan.end_points[0].y = 768;
scans[1].scan.end_points[1].x = 512;
scans[1].scan.end_points[1].y = 512;
memcpy(_scansBuffer.contents, scans, sizeof(scans));
}
/*!
@method mtkView:drawableSizeWillChange:
@abstract Called whenever the drawableSize of the view will change
@ -119,8 +95,7 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
@param size New drawable size in pixels
*/
- (void)mtkView:(nonnull MTKView *)view drawableSizeWillChange:(CGSize)size {
_uniforms.aspectRatioMultiplier = float((4.0 / 3.0) / (size.width / size.height));
[self setUniforms];
uniforms()->aspectRatioMultiplier = float((4.0 / 3.0) / (size.width / size.height));
}
/*!
@ -134,13 +109,34 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
MTLRenderPassDescriptor *const descriptor = view.currentRenderPassDescriptor;
id <MTLRenderCommandEncoder> encoder = [commandBuffer renderCommandEncoderWithDescriptor:descriptor];
const Outputs::Display::ScanTarget::Modals *const newModals = _scanTarget.new_modals();
if(newModals) {
uniforms()->scale[0] = newModals->output_scale.x;
uniforms()->scale[1] = newModals->output_scale.y;
uniforms()->lineWidth = 1.0f / newModals->expected_vertical_lines;
// TODO: establish at least a texture. Obey the rest of the modals generally.
}
// Drawing. Just the test triangle, as described above.
[encoder setRenderPipelineState:_gouraudPipeline];
[encoder setVertexBuffer:_scansBuffer offset:0 atIndex:0];
[encoder setVertexBuffer:_uniformsBuffer offset:0 atIndex:1];
[encoder drawPrimitives:MTLPrimitiveTypeTriangleStrip vertexStart:0 vertexCount:4 instanceCount:2];
_scanTarget.perform([=] (const BufferingScanTarget::OutputArea &outputArea) {
// TEMPORARY: just draw the scans.
if(outputArea.start.scan != outputArea.end.scan) {
if(outputArea.start.scan < outputArea.end.scan) {
[encoder drawPrimitives:MTLPrimitiveTypeTriangleStrip vertexStart:0 vertexCount:4 instanceCount:outputArea.end.scan - outputArea.start.scan baseInstance:outputArea.start.scan];
} else {
[encoder drawPrimitives:MTLPrimitiveTypeTriangleStrip vertexStart:0 vertexCount:4 instanceCount:NumBufferedScans - outputArea.start.scan baseInstance:outputArea.start.scan];
if(outputArea.end.scan) {
[encoder drawPrimitives:MTLPrimitiveTypeTriangleStrip vertexStart:0 vertexCount:4 instanceCount:outputArea.end.scan];
}
}
}
});
// Complete encoding.
[encoder endEncoding];