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| 1 | // +build darwin
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| 2 |
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| 3 | // movingtriangle is an example Metal program that displays a moving triangle in a window.
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| 4 | package main
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| 5 |
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| 6 | import (
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| 7 | "flag"
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| 8 | "fmt"
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| 9 | "log"
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| 10 | "os"
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| 11 | "runtime"
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| 12 | "time"
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| 13 | "unsafe"
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| 14 |
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| 15 | "dmitri.shuralyov.com/gpu/mtl"
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| 16 | "github.com/go-gl/glfw/v3.2/glfw"
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| 17 | "golang.org/x/image/math/f32"
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| 18 | )
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| 19 |
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| 20 | func usage() {
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| 21 | fmt.Fprintln(os.Stderr, "Usage: movingtriangle")
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| 22 | flag.PrintDefaults()
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| 23 | }
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| 24 |
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| 25 | func init() {
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| 26 | runtime.LockOSThread()
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| 27 | }
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| 28 |
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| 29 | func main() {
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| 30 | flag.Usage = usage
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| 31 | flag.Parse()
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| 32 |
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| 33 | err := run()
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| 34 | if err != nil {
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| 35 | log.Fatalln(err)
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| 36 | }
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| 37 | }
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| 38 |
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| 39 | func run() error {
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| 40 | device, err := mtl.CreateSystemDefaultDevice()
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| 41 | if err != nil {
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| 42 | return err
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| 43 | }
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| 44 | fmt.Println("Metal device:", device.Name)
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| 45 |
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| 46 | err = glfw.Init()
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| 47 | if err != nil {
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| 48 | return err
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| 49 | }
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| 50 | defer glfw.Terminate()
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| 51 |
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| 52 | glfw.WindowHint(glfw.ClientAPI, glfw.NoAPI)
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| 53 | window, err := glfw.CreateWindow(640, 480, "Metal Example", nil, nil)
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| 54 | if err != nil {
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| 55 | return err
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| 56 | }
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| 57 | defer window.Destroy()
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| 58 |
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| 59 | layer := mtl.MakeLayer()
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| 60 | layer.SetDevice(device)
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| 61 | layer.SetPixelFormat(mtl.PixelFormatBGRA8UNorm)
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| 62 | layer.SetDrawableSize(window.GetFramebufferSize())
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| 63 | layer.SetMaximumDrawableCount(3)
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| 64 | layer.SetDisplaySyncEnabled(true)
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| 65 | mtl.SetWindowContentViewLayer(window.GetCocoaWindow(), layer)
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| 66 | mtl.SetWindowContentViewWantsLayer(window.GetCocoaWindow(), true)
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| 67 |
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| 68 | // Set callbacks.
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| 69 | window.SetFramebufferSizeCallback(func(_ *glfw.Window, width, height int) {
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| 70 | layer.SetDrawableSize(width, height)
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| 71 | })
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| 72 | var windowSize = [2]int32{640, 480}
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| 73 | window.SetSizeCallback(func(_ *glfw.Window, width, height int) {
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| 74 | windowSize[0], windowSize[1] = int32(width), int32(height)
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| 75 | })
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| 76 | var pos [2]float32
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| 77 | window.SetCursorPosCallback(func(_ *glfw.Window, x, y float64) {
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| 78 | pos[0], pos[1] = float32(x), float32(y)
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| 79 | })
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| 80 |
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| 81 | // Create a render pipeline state.
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| 82 | const source = `#include <metal_stdlib>
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| 83 |
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| 84 | using namespace metal;
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| 85 |
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| 86 | struct Vertex {
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| 87 | float4 position [[position]];
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| 88 | float4 color;
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| 89 | };
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| 90 |
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| 91 | vertex Vertex VertexShader(
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| 92 | uint vertexID [[vertex_id]],
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| 93 | device Vertex * vertices [[buffer(0)]],
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| 94 | constant int2 * windowSize [[buffer(1)]],
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| 95 | constant float2 * pos [[buffer(2)]]
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| 96 | ) {
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| 97 | Vertex out = vertices[vertexID];
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| 98 | out.position.xy += *pos;
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| 99 | float2 viewportSize = float2(*windowSize);
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| 100 | out.position.xy = float2(-1 + out.position.x / (0.5 * viewportSize.x),
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| 101 | 1 - out.position.y / (0.5 * viewportSize.y));
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| 102 | return out;
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| 103 | }
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| 104 |
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| 105 | fragment float4 FragmentShader(Vertex in [[stage_in]]) {
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| 106 | return in.color;
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| 107 | }
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| 108 | `
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| 109 | lib, err := device.MakeLibrary(source, mtl.CompileOptions{})
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| 110 | if err != nil {
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| 111 | return err
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| 112 | }
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| 113 | vs, err := lib.MakeFunction("VertexShader")
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| 114 | if err != nil {
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| 115 | return err
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| 116 | }
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| 117 | fs, err := lib.MakeFunction("FragmentShader")
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| 118 | if err != nil {
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| 119 | return err
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| 120 | }
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| 121 | var rpld mtl.RenderPipelineDescriptor
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| 122 | rpld.VertexFunction = vs
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| 123 | rpld.FragmentFunction = fs
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| 124 | rpld.ColorAttachments[0].PixelFormat = layer.PixelFormat()
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| 125 | rps, err := device.MakeRenderPipelineState(rpld)
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| 126 | if err != nil {
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| 127 | return err
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| 128 | }
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| 129 |
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| 130 | // Create a vertex buffer.
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| 131 | type Vertex struct {
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| 132 | Position f32.Vec4
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| 133 | Color f32.Vec4
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| 134 | }
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| 135 | vertexData := [...]Vertex{
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| 136 | {f32.Vec4{0, 0, 0, 1}, f32.Vec4{1, 0, 0, 1}},
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| 137 | {f32.Vec4{300, 100, 0, 1}, f32.Vec4{0, 1, 0, 1}},
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| 138 | {f32.Vec4{0, 100, 0, 1}, f32.Vec4{0, 0, 1, 1}},
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| 139 | }
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| 140 | vertexBuffer := device.MakeBuffer(unsafe.Pointer(&vertexData[0]), unsafe.Sizeof(vertexData), mtl.ResourceStorageModeManaged)
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| 141 |
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| 142 | cq := device.MakeCommandQueue()
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| 143 |
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| 144 | frame := startFPSCounter()
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| 145 |
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| 146 | for !window.ShouldClose() {
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| 147 | glfw.PollEvents()
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| 148 |
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| 149 | // Create a drawable to render into.
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| 150 | drawable, err := layer.NextDrawable()
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| 151 | if err != nil {
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| 152 | return err
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| 153 | }
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| 154 |
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| 155 | cb := cq.MakeCommandBuffer()
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| 156 |
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| 157 | // Encode all render commands.
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| 158 | var rpd mtl.RenderPassDescriptor
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| 159 | rpd.ColorAttachments[0].LoadAction = mtl.LoadActionClear
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| 160 | rpd.ColorAttachments[0].StoreAction = mtl.StoreActionStore
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| 161 | rpd.ColorAttachments[0].ClearColor = mtl.ClearColor{Red: 0.35, Green: 0.65, Blue: 0.85, Alpha: 1}
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| 162 | rpd.ColorAttachments[0].Texture = drawable.Texture()
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| 163 | rce := cb.MakeRenderCommandEncoder(rpd)
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| 164 | rce.SetRenderPipelineState(rps)
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| 165 | rce.SetVertexBuffer(vertexBuffer, 0, 0)
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| 166 | rce.SetVertexBytes(unsafe.Pointer(&windowSize[0]), unsafe.Sizeof(windowSize), 1)
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| 167 | rce.SetVertexBytes(unsafe.Pointer(&pos[0]), unsafe.Sizeof(pos), 2)
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| 168 | rce.DrawPrimitives(mtl.PrimitiveTypeTriangle, 0, 3)
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| 169 | rce.EndEncoding()
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| 170 |
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| 171 | cb.Present(drawable)
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| 172 | cb.Commit()
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| 173 |
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| 174 | frame <- struct{}{}
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| 175 | }
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| 176 |
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| 177 | return nil
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| 178 | }
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| 179 |
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| 180 | func startFPSCounter() chan struct{} {
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| 181 | frame := make(chan struct{}, 4)
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| 182 | go func() {
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| 183 | second := time.Tick(time.Second)
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| 184 | frames := 0
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| 185 | for {
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| 186 | select {
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| 187 | case <-second:
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| 188 | fmt.Println("fps:", frames)
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| 189 | frames = 0
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| 190 | case <-frame:
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| 191 | frames++
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| 192 | }
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| 193 | }
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| 194 | }()
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| 195 | return frame
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| 196 | }
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