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Ties everything together in an attempt to display RGB scans.

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I'm actually just getting a mess of pixels, but it's something!
This commit is contained in:
Thomas Harte 2020-08-09 18:41:15 -04:00
parent cd491bb6e0
commit 57fecdc09e
2 changed files with 27 additions and 18 deletions
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33
OSBindings/Mac/Clock Signal/ScanTarget/CSScanTarget.mm
View File

@ -40,7 +40,7 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
id<MTLFunction> _vertexShader;
id<MTLFunction> _fragmentShader;
id<MTLRenderPipelineState> _gouraudPipeline;
id<MTLRenderPipelineState> _scanPipeline;
// Buffers.
id<MTLBuffer> _uniformsBuffer;
@ -85,14 +85,6 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
_scanTarget.set_write_area(reinterpret_cast<uint8_t *>(_writeAreaBuffer.contents));
_scanTarget.set_line_buffer(reinterpret_cast<BufferingScanTarget::Line *>(_linesBuffer.contents), _lineMetadataBuffer, NumBufferedLines);
_scanTarget.set_scan_buffer(reinterpret_cast<BufferingScanTarget::Scan *>(_scansBuffer.contents), NumBufferedScans);
// Generate TEST pipeline.
id<MTLLibrary> library = [view.device newDefaultLibrary];
MTLRenderPipelineDescriptor *pipelineDescriptor = [[MTLRenderPipelineDescriptor alloc] init];
pipelineDescriptor.vertexFunction = [library newFunctionWithName:@"scanVertexMain"];
pipelineDescriptor.fragmentFunction = [library newFunctionWithName:@"scanFragmentMain"];
pipelineDescriptor.colorAttachments[0].pixelFormat = view.colorPixelFormat;
_gouraudPipeline = [view.device newRenderPipelineStateWithDescriptor:pipelineDescriptor error:nil];
}
return self;
@ -115,11 +107,6 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
@discussion Called on the delegate when it is asked to render into the view
*/
- (void)drawInMTKView:(nonnull MTKView *)view {
// Generate a command encoder for the view.
id <MTLCommandBuffer> commandBuffer = [_commandQueue commandBuffer];
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;
@ -150,11 +137,25 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
offset:0
bytesPerRow:BufferingScanTarget::WriteAreaWidth * _bytesPerInputPixel];
_totalTextureBytes = BufferingScanTarget::WriteAreaWidth * BufferingScanTarget::WriteAreaHeight * _bytesPerInputPixel;
// Generate pipeline.
id<MTLLibrary> library = [view.device newDefaultLibrary];
MTLRenderPipelineDescriptor *pipelineDescriptor = [[MTLRenderPipelineDescriptor alloc] init];
pipelineDescriptor.vertexFunction = [library newFunctionWithName:@"scanVertexMain"];
pipelineDescriptor.fragmentFunction = [library newFunctionWithName:@"scanFragmentMain"];
pipelineDescriptor.colorAttachments[0].pixelFormat = view.colorPixelFormat;
_scanPipeline = [view.device newRenderPipelineStateWithDescriptor:pipelineDescriptor error:nil];
}
// Drawing. Just the test triangle, as described above.
[encoder setRenderPipelineState:_gouraudPipeline];
// Generate a command encoder for the view.
id <MTLCommandBuffer> commandBuffer = [_commandQueue commandBuffer];
MTLRenderPassDescriptor *const descriptor = view.currentRenderPassDescriptor;
id <MTLRenderCommandEncoder> encoder = [commandBuffer renderCommandEncoderWithDescriptor:descriptor];
// Drawing. Just scans.
[encoder setRenderPipelineState:_scanPipeline];
[encoder setFragmentTexture:_writeAreaTexture atIndex:0];
[encoder setVertexBuffer:_scansBuffer offset:0 atIndex:0];
[encoder setVertexBuffer:_uniformsBuffer offset:0 atIndex:1];

12
OSBindings/Mac/Clock Signal/ScanTarget/ScanTarget.metal
View File

@ -51,6 +51,7 @@ struct Line {
// This is an intermediate struct, which is TEMPORARY.
struct ColouredVertex {
float4 position [[position]];
float2 textureCoordinates;
};
@ -81,9 +82,16 @@ vertex ColouredVertex scanVertexMain( constant Uniforms &uniforms [[buffer(1)]],
0.0,
1.0
);
output.textureCoordinates = float2(
mix(scans[instanceID].endPoints[0].dataOffset, scans[instanceID].endPoints[1].dataOffset, float((vertexID&2) >> 1)),
scans[instanceID].dataY);
return output;
}
fragment half4 scanFragmentMain(ColouredVertex vert [[stage_in]]) {
return half4(1.0);
fragment half4 scanFragmentMain(ColouredVertex vert [[stage_in]], texture2d<float> texture [[texture(0)]]) {
constexpr sampler s(coord::pixel,
address::clamp_to_zero, // This really makes no difference here; anything Metal will accept will do.
filter::nearest);
return half4(texture.sample(s, vert.textureCoordinates));
}