/
viewer.go
134 lines (112 loc) · 2.17 KB
/
viewer.go
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package viewer
import (
"fmt"
"image"
"os"
"runtime"
"github.com/Laughs-In-Flowers/log"
i "github.com/Laughs-In-Flowers/valhalla/lib/image"
"github.com/go-gl/gl/v4.5-core/gl"
"github.com/go-gl/glfw/v3.2/glfw"
)
type Viewer struct {
*glfw.Window
log.Logger
*callbacks
initialized bool
kill bool
image *i.Image
}
func New(path string, l log.Logger) (*Viewer, error) {
a := defaultCallbacks()
im, err := i.New(path)
if err != nil {
return &Viewer{nil, l, a, false, false, nil}, err
}
l.Printf("opened image at %s", path)
v := &Viewer{nil, l, a, false, false, im}
err = initialize(v)
if err != nil {
return nil, err
}
return v, nil
}
func bound(im image.Image) (int, int) {
var w, h int
const maxSize = 1200
w = im.Bounds().Size().X
h = im.Bounds().Size().Y
a := float64(w) / float64(h)
if a >= 1 {
if w > maxSize {
w = maxSize
h = int(maxSize / a)
}
} else {
if h > maxSize {
h = maxSize
w = int(maxSize * a)
}
}
return w, h
}
func initialize(v *Viewer) error {
if !v.initialized {
if err := gl.Init(); err != nil {
return err
}
if err := glfw.Init(); err != nil {
return err
}
glfw.WindowHint(glfw.ContextVersionMajor, 4)
glfw.WindowHint(glfw.ContextVersionMinor, 5)
glfw.WindowHint(glfw.Resizable, glfw.False)
w, h := bound(v.image)
ip := v.image.Path()
wt := fmt.Sprintf("valhalla -- %s", ip)
window, err := glfw.CreateWindow(w, h, wt, nil, nil)
if err != nil {
return err
}
window.MakeContextCurrent()
glfw.SwapInterval(1)
window.SetKeyCallback(MakeKeyCallback(v))
v.Window = window
v.SetRefreshCallback(v.onRefresh)
gl.ClearColor(0.11, 0.545, 0.765, 0.0)
v.initialized = true
}
return nil
}
func (v *Viewer) Run() {
v.Print("viewing...")
runtime.LockOSThread()
RUN:
for {
if v.kill {
break RUN
}
v.Draw()
glfw.PollEvents()
}
close(v)
}
func close(v *Viewer) {
v.image.Free()
v.Destroy()
glfw.Terminate()
v.Print("exiting")
os.Exit(0)
}
func (v *Viewer) Kill() {
v.kill = true
}
func (v *Viewer) onRefresh(*glfw.Window) {
v.Draw()
}
func (v *Viewer) Draw() {
v.MakeContextCurrent()
gl.Clear(gl.COLOR_BUFFER_BIT)
v.image.Draw()
v.SwapBuffers()
}