func screenShot() {
b := make([]uint8, Width*Height*4)
gl.ReadPixels(0, 0, Width, Height, gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&b[0]))
rect := image.Rect(0, 0, Width, Height)
im := image.NRGBA{
Pix: b,
Stride: Width * 4,
Rect: rect,
}
if f, err := os.Create("screenshot.png"); err == nil {
defer f.Close()
png.Encode(f, &im)
}
}
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))
}