最近在看看一个Golang的项目，里面使用了GLFW和GL来写UI，之前从来没有接触过这两个库，安装官方文档写了一个例子。

package main

import (
    "runtime"
    "github.com/go-gl/glfw/v3.1/glfw"
)

func init() {
    // This is needed to arrange that main() runs on main thread.
    // See documentation for functions that are only allowed to be called from the main thread.
    runtime.LockOSThread()
}

func main() {
    err := glfw.Init()
    if err != nil {
        panic(err)
    }
    defer glfw.Terminate()

    window,err := glfw.CreateWindow(640,480,"Testing",nil,nil)
    if err != nil {
        panic(err)
    }

    window.MakeContextCurrent()

    for !window.ShouldClose() {
        // Do OpenGL stuff.
        window.SwapBuffers()
        glfw.PollEvents()
    }
}

这个例子可以直接run，一切都很正常。后来看到一个C库的例子，想照猫画一下，但是就遇到问题了。

按照这个例子添加了如下代码：

        gl.Begin(gl.TRIANGLES)

        gl.Color3f(1.0,0.0,0.0) //red
        gl.Vertex3f(0.0,1.0,0.0)

        gl.Color3f(0.0,0.0) //Green
        gl.Vertex3f(-1.0,-1.0,1.0) //blue
        gl.Vertex3f(1.0,0.0)

        gl.End()

直接运行会报错：

fatal error: unexpected signal during runtime execution