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SDL Surface from image.RGBA
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package main | |
import ( | |
"image" | |
"image/png" | |
"log" | |
"os" | |
"time" | |
"unsafe" | |
"github.com/veandco/go-sdl2/sdl" | |
) | |
func main() { | |
sdl.Init(sdl.INIT_EVERYTHING) | |
window, render, err := sdl.CreateWindowAndRenderer(1024, 768, sdl.WINDOW_SHOWN) | |
if err != nil { | |
log.Fatal(err) | |
} | |
f, err := os.Open("rocket.png") | |
if err != nil { | |
log.Fatal(err) | |
} | |
img, err := png.Decode(f) | |
if err != nil { | |
log.Fatal(err) | |
} | |
ir, ok := img.(*image.RGBA) | |
if !ok { | |
log.Fatal("Not RGBA") | |
} | |
width := int32(ir.Bounds().Dx()) | |
height := int32(ir.Bounds().Dy()) | |
surf, err := sdl.CreateRGBSurfaceWithFormatFrom( | |
unsafe.Pointer(&ir.Pix[0]), | |
width, | |
height, | |
32, | |
int32(ir.Bounds().Dx()*4), | |
// this has confused me in the past, must be ABGR, at least on Intel 64 bit | |
sdl.PIXELFORMAT_ABGR8888, | |
) | |
if err != nil { | |
log.Fatal(err) | |
} | |
tex, err := render.CreateTextureFromSurface(surf) | |
if err != nil { | |
log.Fatal(err) | |
} | |
t := time.Tick(16 * time.Millisecond) | |
window.Show() | |
y := 768 - height/2 | |
for { | |
<-t | |
render.Copy( | |
tex, | |
&sdl.Rect{0, 0, width, height}, | |
&sdl.Rect{1024/2, y, width/2, height/2}, | |
) | |
y = y - 5 | |
if y <= 0-height/2 { | |
return | |
} | |
render.Present() | |
} | |
} |
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