/
initialize.go
80 lines (65 loc) · 1.57 KB
/
initialize.go
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package ui
import (
"image"
"log"
"runtime"
"github.com/go-gl/gl/v2.1/gl"
"github.com/go-gl/glfw/v3.2/glfw"
"github.com/pkg/errors"
)
const (
windowSizeX = 768
windowSizeY = 720
)
func init() {
runtime.LockOSThread()
}
func Initialize() (*glfw.Window, uint32, error) {
window, err := initGlfw()
if err != nil {
return nil, 0, errors.Wrap(err, "initGlfw failed")
}
program, err := initOpenGL()
if err != nil {
return nil, 0, errors.Wrap(err, "initOpenGL failed")
}
tex := createTexture()
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.UseProgram(program)
return window, tex, nil
}
func Redraw(window *glfw.Window, tex uint32, buffer *image.RGBA) {
gl.BindTexture(gl.TEXTURE_2D, tex)
setTexture(buffer)
drawBuffer(window)
gl.BindTexture(gl.TEXTURE_2D, 0)
window.SwapBuffers()
glfw.PollEvents()
}
func Terminate(window *glfw.Window) {
glfw.Terminate()
}
func initGlfw() (*glfw.Window, error) {
if err := glfw.Init(); err != nil {
return nil, errors.Wrap(err, "can't init GL")
}
glfw.WindowHint(glfw.Resizable, glfw.False)
glfw.WindowHint(glfw.ContextVersionMajor, 2)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
window, err := glfw.CreateWindow(windowSizeX, windowSizeY, "NES Emulator", nil, nil)
if err != nil {
return nil, errors.Wrap(err, "can't create GL window")
}
window.MakeContextCurrent()
return window, nil
}
func initOpenGL() (uint32, error) {
if err := gl.Init(); err != nil {
return 0, err
}
version := gl.GoStr(gl.GetString(gl.VERSION))
log.Println("OpenGL version", version)
prog := gl.CreateProgram()
gl.LinkProgram(prog)
return prog, nil
}