【golang/g3n】3D游戏引擎G3N的windows安装与测试

news2024/9/21 1:39:13

说在前面

操作系统：win 11
go version：go1.21.5 windows/amd64
g3n版本：github.com/g3n/engine v0.2.0
其他：找了下golang 3d相关的库，目前好像就这个比较活跃

安装

按照官方教程所说，需要mingw环境，首先按照教程去下载

We tested the Windows build using the mingw-w64 toolchain (you can download this file in particular).
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)
	})
}