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// vim: shiftwidth=4 tabstop=4 noexpandtab
package main
import (
"log"
"github.com/go-gl/glfw/v3.3/glfw"
"github.com/go-gl/mathgl/mgl32"
)
const (
WINDOW_WIDTH = 500
WINDOW_HEIGHT = 500
WINDOW_TITLE = "stlscope"
)
// App contains data about the OpenGL application including for example the
// window, OpenGL graphics and the current STL model.
type App struct {
window *glfw.Window
graphics *Graphics
stl *StlModel
homeTrafo mgl32.Mat4
}
// newApp creates a new App struct based on a given STL model.
func newApp(stl *StlModel) App {
var app App = App{}
app.stl = stl
var err error
log.Println("GLFW init")
if err := glfw.Init(); err != nil {
panic(err)
}
glfw.WindowHint(glfw.Resizable, glfw.False)
glfw.WindowHint(glfw.ContextVersionMajor, 4)
glfw.WindowHint(glfw.ContextVersionMinor, 6)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
glfw.WindowHint(glfw.Samples, 16) // anti-aliasing
log.Println("Creating Window")
app.window, err = glfw.CreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT,
WINDOW_TITLE, nil, nil)
if err != nil {
panic(err)
}
app.window.MakeContextCurrent()
app.homeTrafo = stl.surface.getHomeView()
return app
}
// handle has to be called frequently to let the App work.
func (application *App) handle() {
glfw.PollEvents()
application.window.SwapBuffers()
// generate and set transformation
trafo := application.homeTrafo
trafo = mgl32.HomogRotate3D(
float32(glfw.GetTime()) * 0.4 * 6.282,
mgl32.Vec3{0.1, 1, 0}).Mul4(trafo) // apply time-based rotation
application.graphics.setTrafo(trafo)
}
// terminate closes the App.
func (application *App) terminate() {
glfw.Terminate()
}
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