// vim: shiftwidth=4 tabstop=4 noexpandtab

package main

import (
	"runtime"
	"log"
	"flag"

	"github.com/go-gl/glfw/v3.3/glfw"
)

var (
	stlFilePath string
)

func main() {

	// read command line arguments
	parseFlags()

	// parse STL file
	_, err := ReadBinaryStlFile(stlFilePath)
	if err != nil {
		log.Fatal(err)
	}

	// lock this program to one OS thread (details: https://golang.org/pkg/runtime/#LockOSThread)
	log.Println("Locking OS thread")
	runtime.LockOSThread()

	// init GLFW and assert termination at end of main
	window := initGlfw()
	defer glfw.Terminate()

	// init OpenGL
	program := initOpenGL()

	vao := makeVao(triangle)

	// main loop
	for !window.ShouldClose() {
		draw(vao, window, program)
	}
}

func parseFlags() {
	flag.StringVar(&stlFilePath, "file", "myfile.stl", "path to the binary STL file")
	flag.Parse()
}