Go 1.5 Crash

main.go

package main

import (
	"fmt"
	"log"

	"github.com/go-gl/gl/v2.1/gl"
	"github.com/go-gl/glfw/v3.1/glfw"
	"github.com/ungerik/go-cairo"
)

func createTexture() uint32 {
	var texture uint32
	gl.GenTextures(1, &texture)
	gl.BindTexture(gl.TEXTURE_2D, texture)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
	return texture
}

func setTexture(surface *cairo.Surface) {
	gl.TexImage2D(
		gl.TEXTURE_2D, 0, gl.RGBA,
		int32(surface.GetWidth()),
		int32(surface.GetHeight()),
		0, gl.RGBA, gl.UNSIGNED_BYTE,
		gl.Ptr(surface.GetData()))
	// or just:
	// surface.GetData() // <-- just calling surface.GetData() is sufficient
}

func drawBuffer(window *glfw.Window) {
	gl.Begin(gl.QUADS)
	gl.TexCoord2f(0, 1)
	gl.Vertex2f(-1, -1)
	gl.TexCoord2f(1, 1)
	gl.Vertex2f(1, -1)
	gl.TexCoord2f(1, 0)
	gl.Vertex2f(1, 1)
	gl.TexCoord2f(0, 0)
	gl.Vertex2f(-1, 1)
	gl.End()
}

func main() {
	// initialize glfw
	if err := glfw.Init(); err != nil {
		log.Fatalln(err)
	}
	defer glfw.Terminate()

	// create window
	glfw.WindowHint(glfw.ContextVersionMajor, 2)
	glfw.WindowHint(glfw.ContextVersionMinor, 1)
	window, err := glfw.CreateWindow(640, 480, "Go", nil, nil)
	if err != nil {
		log.Fatalln(err)
	}
	window.MakeContextCurrent()

	// initialize gl
	if err := gl.Init(); err != nil {
		log.Fatalln(err)
	}
	gl.Enable(gl.TEXTURE_2D)
	createTexture()

	for !window.ShouldClose() {
		w, h := window.GetFramebufferSize()
		fmt.Println(w, h)
		x, y := float64(w), float64(h)
		dc := cairo.NewSurface(cairo.FORMAT_ARGB32, w, h)
		dc.SetSourceRGB(0, 0, 0)
		dc.Paint()
		dc.SetSourceRGB(1, 1, 1)
		dc.MoveTo(0, 0)
		dc.LineTo(x, y)
		dc.MoveTo(x, 0)
		dc.LineTo(0, y)
		dc.SetLineWidth(8)
		dc.Stroke()
		setTexture(dc)
		drawBuffer(window)
		window.SwapBuffers()
		glfw.PollEvents()
		// runtime.GC() // <-- using this gets us further but still crashes
	}
}