ebiten/internal/graphicsdriver/metal/mtl/example_test.go

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2018-11-12 16:00:10 +01:00
// Copyright 2018 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build darwin
package mtl_test
import (
"encoding/json"
"fmt"
"image"
"image/color"
"log"
"os"
"unsafe"
"golang.org/x/image/math/f32"
"github.com/hajimehoshi/ebiten/internal/graphicsdriver/metal/mtl"
)
func Example_listDevices() {
device, err := mtl.CreateSystemDefaultDevice()
if err != nil {
log.Fatalln(err)
}
printJSON("preferred system default Metal device = ", device)
fmt.Println("device supports the macOS GPU family 1, version 1 feature set:", device.SupportsFeatureSet(mtl.MacOSGPUFamily1V1))
fmt.Println("device supports the macOS GPU family 1, version 2 feature set:", device.SupportsFeatureSet(mtl.MacOSGPUFamily1V2))
fmt.Println("device supports the macOS read-write texture, tier 2 feature set:", device.SupportsFeatureSet(mtl.MacOSReadWriteTextureTier2))
fmt.Println("device supports the macOS GPU family 1, version 3 feature set:", device.SupportsFeatureSet(mtl.MacOSGPUFamily1V3))
fmt.Println("device supports the macOS GPU family 1, version 4 feature set:", device.SupportsFeatureSet(mtl.MacOSGPUFamily1V4))
fmt.Println("device supports the macOS GPU family 2, version 1 feature set:", device.SupportsFeatureSet(mtl.MacOSGPUFamily2V1))
// Sample output:
// all Metal devices in the system = [
// {
// "Headless": false,
// "LowPower": true,
// "Removable": false,
// "RegistryID": 4294968287,
// "Name": "Intel Iris Pro Graphics"
// },
// {
// "Headless": false,
// "LowPower": false,
// "Removable": false,
// "RegistryID": 4294968322,
// "Name": "AMD Radeon R9 M370X"
// }
// ]
// preferred system default Metal device = {
// "Headless": false,
// "LowPower": false,
// "Removable": false,
// "RegistryID": 4294968322,
// "Name": "AMD Radeon R9 M370X"
// }
// device supports the macOS GPU family 1, version 1 feature set: true
// device supports the macOS GPU family 1, version 2 feature set: true
// device supports the macOS read-write texture, tier 2 feature set: true
// device supports the macOS GPU family 1, version 3 feature set: true
// device supports the macOS GPU family 1, version 4 feature set: true
// device supports the macOS GPU family 2, version 1 feature set: true
}
// printJSON prints label, then v as JSON encoded with indent to stdout. It panics on any error.
// It's meant to be used by examples to print the output.
func printJSON(label string, v interface{}) {
fmt.Print(label)
w := json.NewEncoder(os.Stdout)
w.SetIndent("", "\t")
err := w.Encode(v)
if err != nil {
panic(err)
}
}
func Example_renderTriangle() {
device, err := mtl.CreateSystemDefaultDevice()
if err != nil {
log.Fatalln(err)
}
// Create a render pipeline state.
const source = `#include <metal_stdlib>
using namespace metal;
struct Vertex {
float4 position [[position]];
float4 color;
};
vertex Vertex VertexShader(
uint vertexID [[vertex_id]],
device Vertex * vertices [[buffer(0)]]
) {
return vertices[vertexID];
}
fragment float4 FragmentShader(Vertex in [[stage_in]]) {
return in.color;
}
`
lib, err := device.MakeLibrary(source, mtl.CompileOptions{})
if err != nil {
log.Fatalln(err)
}
vs, err := lib.MakeFunction("VertexShader")
if err != nil {
log.Fatalln(err)
}
fs, err := lib.MakeFunction("FragmentShader")
if err != nil {
log.Fatalln(err)
}
var rpld mtl.RenderPipelineDescriptor
rpld.VertexFunction = vs
rpld.FragmentFunction = fs
rpld.ColorAttachments[0].PixelFormat = mtl.PixelFormatRGBA8UNorm
rps, err := device.MakeRenderPipelineState(rpld)
if err != nil {
log.Fatalln(err)
}
// Create a vertex buffer.
type Vertex struct {
Position f32.Vec4
Color f32.Vec4
}
vertexData := [...]Vertex{
{f32.Vec4{+0.00, +0.75, 0, 1}, f32.Vec4{1, 1, 1, 1}},
{f32.Vec4{-0.75, -0.75, 0, 1}, f32.Vec4{1, 1, 1, 1}},
{f32.Vec4{+0.75, -0.75, 0, 1}, f32.Vec4{0, 0, 0, 1}},
}
vertexBuffer := device.MakeBufferWithBytes(unsafe.Pointer(&vertexData[0]), unsafe.Sizeof(vertexData), mtl.ResourceStorageModeManaged)
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// Create an output texture to render into.
td := mtl.TextureDescriptor{
TextureType: mtl.TextureType2D,
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PixelFormat: mtl.PixelFormatRGBA8UNorm,
Width: 80,
Height: 20,
StorageMode: mtl.StorageModeManaged,
}
texture := device.MakeTexture(td)
cq := device.MakeCommandQueue()
cb := cq.MakeCommandBuffer()
// Encode all render commands.
var rpd mtl.RenderPassDescriptor
rpd.ColorAttachments[0].LoadAction = mtl.LoadActionClear
rpd.ColorAttachments[0].StoreAction = mtl.StoreActionStore
rpd.ColorAttachments[0].ClearColor = mtl.ClearColor{Red: 0, Green: 0, Blue: 0, Alpha: 1}
rpd.ColorAttachments[0].Texture = texture
rce := cb.MakeRenderCommandEncoder(rpd)
rce.SetRenderPipelineState(rps)
rce.SetVertexBuffer(vertexBuffer, 0, 0)
rce.DrawPrimitives(mtl.PrimitiveTypeTriangle, 0, 3)
rce.EndEncoding()
// Encode all blit commands.
bce := cb.MakeBlitCommandEncoder()
bce.Synchronize(texture)
bce.EndEncoding()
cb.Commit()
cb.WaitUntilCompleted()
// Read pixels from output texture into an image.
img := image.NewNRGBA(image.Rect(0, 0, texture.Width(), texture.Height()))
bytesPerRow := 4 * texture.Width()
region := mtl.RegionMake2D(0, 0, texture.Width(), texture.Height())
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texture.GetBytes(&img.Pix[0], uintptr(bytesPerRow), region, 0)
// Output image to stdout as grayscale ASCII art.
levels := []struct {
MinY uint8
Shade string
}{{220, " "}, {170, "░"}, {85, "▒"}, {35, "▓"}, {0, "█"}}
for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
c := color.GrayModel.Convert(img.At(x, y)).(color.Gray)
for _, l := range levels {
if c.Y >= l.MinY {
fmt.Print(l.Shade)
break
}
}
}
fmt.Println()
}
// Output:
// ████████████████████████████████████████████████████████████████████████████████
// ████████████████████████████████████████████████████████████████████████████████
// ████████████████████████████████████████████████████████████████████████████████
// ██████████████████████████████████████ ██████████████████████████████████████
// ████████████████████████████████████ ████████████████████████████████████
// ██████████████████████████████████ ░░░░██████████████████████████████████
// ████████████████████████████████ ░░░░░░░░████████████████████████████████
// ██████████████████████████████ ░░░░░░░░░░░░██████████████████████████████
// ████████████████████████████ ░░░░░░░░░░░░▒▒▒▒████████████████████████████
// ██████████████████████████ ░░░░░░░░░░░░▒▒▒▒▒▒▒▒██████████████████████████
// ████████████████████████ ░░░░░░░░░░░░▒▒▒▒▒▒▒▒▒▒▒▒████████████████████████
// ██████████████████████ ░░░░░░░░░░░░▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒██████████████████████
// ████████████████████ ░░░░░░░░░░░░▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒████████████████████
// ██████████████████ ░░░░░░░░░░░░▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓██████████████████
// ████████████████ ░░░░░░░░░░░░▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▓▓████████████████
// ██████████████ ░░░░░░░░░░░░▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓██████████████
// ████████████ ░░░░░░░░░░░░▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓████████████████
// ████████████████████████████████████████████████████████████████████████████████
// ████████████████████████████████████████████████████████████████████████████████
// ████████████████████████████████████████████████████████████████████████████████
}