69 lines
2.3 KiB
Swift
69 lines
2.3 KiB
Swift
//
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// MetalView.swift
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// chapter04
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//
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// Created by Marius on 1/26/16.
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// Copyright © 2016 Marius Horga. All rights reserved.
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//
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import MetalKit
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class MetalView: MTKView {
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var vertex_buffer: MTLBuffer!
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var rps: MTLRenderPipelineState! = nil
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override func drawRect(dirtyRect: NSRect) {
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super.drawRect(dirtyRect)
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render()
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}
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func render() {
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device = MTLCreateSystemDefaultDevice()
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createBuffer()
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registerShaders()
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sendToGPU()
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}
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struct Vertex {
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var position: vector_float4
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var color: vector_float4
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};
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func createBuffer() {
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let vertex_data = [Vertex(position: [-1.0, -1.0, 0.0, 1.0], color: [1, 0, 0, 1]),
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Vertex(position: [ 1.0, -1.0, 0.0, 1.0], color: [0, 1, 0, 1]),
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Vertex(position: [ 0.0, 1.0, 0.0, 1.0], color: [0, 0, 1, 1])]
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vertex_buffer = device!.newBufferWithBytes(vertex_data, length: sizeof(Vertex) * 3, options:[])
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}
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func registerShaders() {
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let library = device!.newDefaultLibrary()!
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let vertex_func = library.newFunctionWithName("vertex_func")
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let frag_func = library.newFunctionWithName("fragment_func")
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let rpld = MTLRenderPipelineDescriptor()
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rpld.vertexFunction = vertex_func
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rpld.fragmentFunction = frag_func
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rpld.colorAttachments[0].pixelFormat = .BGRA8Unorm
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do {
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try rps = device!.newRenderPipelineStateWithDescriptor(rpld)
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} catch let error {
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self.print("\(error)")
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}
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}
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func sendToGPU() {
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if let rpd = currentRenderPassDescriptor, drawable = currentDrawable {
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rpd.colorAttachments[0].clearColor = MTLClearColorMake(0.5, 0.5, 0.5, 1.0)
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let command_buffer = device!.newCommandQueue().commandBuffer()
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let command_encoder = command_buffer.renderCommandEncoderWithDescriptor(rpd)
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command_encoder.setRenderPipelineState(rps)
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command_encoder.setVertexBuffer(vertex_buffer, offset: 0, atIndex: 0)
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command_encoder.drawPrimitives(.Triangle, vertexStart: 0, vertexCount: 3, instanceCount: 1)
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command_encoder.endEncoding()
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command_buffer.presentDrawable(drawable)
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command_buffer.commit()
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}
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}
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}
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