目录

• 说在前面
• 安装
• 测试

说在前面

安装

• 按照官方教程所说，需要mingw环境，首先按照教程去下载
• 下载后将文件解压，并添加环境变量(主要是bin、include、lib)
  
  
• 然后下载g3n源代码

  git clone https://github.com/g3n/engine g3n-engine
  

  同样添加下环境变量
  
• 重启
• 然后可以开始install了

  cd g3n-engine
  go install ./...
  

测试

• 创建一个空文件加，创建一个main.go 文件

  package main
  
  import (
  	"time"
  
  	"github.com/g3n/engine/app"
  	"github.com/g3n/engine/camera"
  	"github.com/g3n/engine/core"
  	"github.com/g3n/engine/geometry"
  	"github.com/g3n/engine/gls"
  	"github.com/g3n/engine/graphic"
  	"github.com/g3n/engine/gui"
  	"github.com/g3n/engine/light"
  	"github.com/g3n/engine/material"
  	"github.com/g3n/engine/math32"
  	"github.com/g3n/engine/renderer"
  	"github.com/g3n/engine/util/helper"
  	"github.com/g3n/engine/window"
  )
  
  func main() {
  
  	// 创建app
  	a := app.App()
  	// 创建scene
  	scene := core.NewNode()
  
  	// 设置gui控制器
  	gui.Manager().Set(scene)
  
  	// 创建相机
  	cam := camera.New(1)
  	cam.SetPosition(0, 0, 3)
  	scene.Add(cam)
  
  	// 初始化相机控制器
  	camera.NewOrbitControl(cam)
  
  	// 设置窗口回调
  	onResize := func(evname string, ev interface{}) {
  		// Get framebuffer size and update viewport accordingly
  		width, height := a.GetSize()
  		a.Gls().Viewport(0, 0, int32(width), int32(height))
  		// Update the camera's aspect ratio
  		cam.SetAspect(float32(width) / float32(height))
  	}
  	a.Subscribe(window.OnWindowSize, onResize)
  	onResize("", nil)
  
  	// 添加一个蓝色甜甜圈
  	geom := geometry.NewTorus(1, .4, 12, 32, math32.Pi*2)
  	mat := material.NewStandard(math32.NewColor("DarkBlue"))
  	mesh := graphic.NewMesh(geom, mat)
  	scene.Add(mesh)
  
  	// 添加一个改变甜甜圈颜色的按钮
  	btn := gui.NewButton("Make Red")
  	btn.SetPosition(100, 40)
  	btn.SetSize(40, 40)
  	btn.Subscribe(gui.OnClick, func(name string, ev interface{}) {
  		mat.SetColor(math32.NewColor("DarkRed"))
  	})
  	scene.Add(btn)
  
  	// 添加光照
  	scene.Add(light.NewAmbient(&math32.Color{1.0, 1.0, 1.0}, 0.8))
  	pointLight := light.NewPoint(&math32.Color{1, 1, 1}, 5.0)
  	pointLight.SetPosition(1, 0, 2)
  	scene.Add(pointLight)
  
  	// 添加坐标系显示
  	scene.Add(helper.NewAxes(0.5))
  
  	// 设置灰色背景色
  	a.Gls().ClearColor(0.5, 0.5, 0.5, 1.0)
  
  	// 运行应用
  	a.Run(func(renderer *renderer.Renderer, deltaTime time.Duration) {
  		a.Gls().Clear(gls.DEPTH_BUFFER_BIT | gls.STENCIL_BUFFER_BIT | gls.COLOR_BUFFER_BIT)
  		renderer.Render(scene, cam)
  	})
  }
  

• 初始化

  go mod init test
  go mod tidy
  

• 运行

  go run main.go
  

  
• 内存和cpu