func InitWindow(w, h int, multisample int, vsync bool) {
core.Fatal(glfw.Init())
if multisample != 0 {
glfw.OpenWindowHint(glfw.FsaaSamples, multisample)
}
Width, Height = w, h
core.Fatal(glfw.OpenWindow(Width, Height, r, g, b, a, depth, stencil, glfw.Windowed))
glfw.SetWindowTitle("mumax cubed")
if vsync {
glfw.SetSwapInterval(1)
}
}
func Screenshot() {
log.Println("screenshot")
img := image.NewNRGBA(image.Rect(0, 0, Width, Height))
gl.ReadPixels(0, 0, gl.Sizei(Width), gl.Sizei(Height), gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, gl.Pointer(&img.Pix[0]))
// reverse byte order, opengl seems to use little endian.
pix := img.Pix
for i := 0; i < len(pix); i += 4 {
pix[i+0], pix[i+1], pix[i+2], pix[i+3] = pix[i+3], pix[i+2], pix[i+1], pix[i+0]
}
fname := fmt.Sprintf("frame%04d.png", scroti)
scroti++
f, err := os.OpenFile(fname, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0666)
core.Fatal(err)
defer f.Close()
core.Fatal(png.Encode(f, img))
}
func InitGL(smooth bool, multisample int) {
core.Fatal(gl.Init())
gl.Enable(gl.LIGHTING)
gl.Enable(gl.CULL_FACE)
gl.CullFace(gl.BACK)
if multisample != 0 {
gl.Enable(gl.MULTISAMPLE)
}
if smooth {
gl.ShadeModel(gl.SMOOTH)
}
}