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123 lines
3.9 KiB
Plaintext
123 lines
3.9 KiB
Plaintext
//
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// ScanTarget.m
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// Clock Signal
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//
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// Created by Thomas Harte on 02/08/2020.
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// Copyright © 2020 Thomas Harte. All rights reserved.
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//
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#import "CSScanTarget.h"
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#import <Metal/Metal.h>
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namespace {
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struct Uniforms {
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int32_t scale[2];
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float lineWidth;
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};
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}
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@implementation CSScanTarget {
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id<MTLCommandQueue> _commandQueue;
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id<MTLFunction> _vertexShader;
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id<MTLFunction> _fragmentShader;
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id<MTLRenderPipelineState> _gouraudPipeline;
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// Buffers.
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id<MTLBuffer> _quadBuffer; // i.e. four vertices defining a quad.
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id<MTLBuffer> _uniformsBuffer;
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id<MTLBuffer> _scansBuffer;
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}
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- (nonnull instancetype)initWithView:(nonnull MTKView *)view {
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self = [super init];
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if(self) {
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_commandQueue = [view.device newCommandQueue];
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// Install the standard quad.
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constexpr float vertices[] = {
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-0.9f, -0.9f,
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-0.9f, 0.9f,
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0.9f, -0.9f,
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0.9f, 0.9f,
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};
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_quadBuffer = [view.device newBufferWithBytes:vertices length:sizeof(vertices) options:MTLResourceCPUCacheModeDefaultCache];
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// Allocate space for uniforms.
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_uniformsBuffer = [view.device newBufferWithLength:16 options:MTLResourceCPUCacheModeWriteCombined];
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Uniforms testUniforms = {
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.scale = {0, 0},
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.lineWidth = 0.1f
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};
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[self setUniforms:testUniforms];
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// The quad buffer has only 2d positions.
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MTLVertexDescriptor *vertexDescriptor = [[MTLVertexDescriptor alloc] init];
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vertexDescriptor.attributes[0].bufferIndex = 0;
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vertexDescriptor.attributes[0].offset = 0;
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vertexDescriptor.attributes[0].format = MTLVertexFormatFloat2;
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vertexDescriptor.layouts[0].stride = sizeof(float)*2;
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// Generate TEST pipeline.
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id<MTLLibrary> library = [view.device newDefaultLibrary];
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MTLRenderPipelineDescriptor *pipelineDescriptor = [[MTLRenderPipelineDescriptor alloc] init];
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pipelineDescriptor.vertexFunction = [library newFunctionWithName:@"scanVertexMain"];
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pipelineDescriptor.fragmentFunction = [library newFunctionWithName:@"scanFragmentMain"];
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pipelineDescriptor.colorAttachments[0].pixelFormat = view.colorPixelFormat;
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pipelineDescriptor.vertexDescriptor = vertexDescriptor;
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_gouraudPipeline = [view.device newRenderPipelineStateWithDescriptor:pipelineDescriptor error:nil];
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}
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return self;
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}
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- (void)setUniforms:(const Uniforms &)uniforms {
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memcpy(_uniformsBuffer.contents, &uniforms, sizeof(Uniforms));
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// [_uniformsBuffer didModifyRange:NSMakeRange(0, sizeof(Uniforms))];
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}
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/*!
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@method mtkView:drawableSizeWillChange:
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@abstract Called whenever the drawableSize of the view will change
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@discussion Delegate can recompute view and projection matricies or regenerate any buffers to be compatible with the new view size or resolution
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@param view MTKView which called this method
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@param size New drawable size in pixels
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*/
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- (void)mtkView:(nonnull MTKView *)view drawableSizeWillChange:(CGSize)size {
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// I think (?) I don't care about this; the MKLView has already handled resizing the backing,
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// which will naturally change the viewport.
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}
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/*!
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@method drawInMTKView:
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@abstract Called on the delegate when it is asked to render into the view
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@discussion Called on the delegate when it is asked to render into the view
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*/
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- (void)drawInMTKView:(nonnull MTKView *)view {
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// Generate a command encoder for the view.
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id <MTLCommandBuffer> commandBuffer = [_commandQueue commandBuffer];
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MTLRenderPassDescriptor *const descriptor = view.currentRenderPassDescriptor;
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id <MTLRenderCommandEncoder> encoder = [commandBuffer renderCommandEncoderWithDescriptor:descriptor];
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// Drawing. Just the test triangle, as described above.
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[encoder setRenderPipelineState:_gouraudPipeline];
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[encoder setVertexBuffer:_quadBuffer offset:0 atIndex:0];
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[encoder setVertexBuffer:_uniformsBuffer offset:0 atIndex:1];
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[encoder drawPrimitives:MTLPrimitiveTypeTriangleStrip vertexStart:0 vertexCount:4 instanceCount:1];
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// Complete encoding.
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[encoder endEncoding];
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// "Register the drawable's presentation".
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[commandBuffer presentDrawable:view.currentDrawable];
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// Finalise and commit.
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[commandBuffer commit];
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}
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@end
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