// TODO(dmac) Move into gg helpers package
func newImageTexture(path string) *gg.Texture {
img := js.Global.Get("Image").New()
img.Set("src", path)
img.Set("crossOrigin", "")
c := make(chan struct{})
img.Call("addEventListener", "load", func() { close(c) }, false)
<-c
tex := gg.CreateTexture()
gg.ActiveTexture(gg.TEXTURE0)
gg.BindTexture(gg.TEXTURE_2D, tex)
gg.TexImage2D(
gg.TEXTURE_2D,
0,
gg.RGBA,
-1, -1, -1, // These args are ignored in the webgl backend.
gg.RGBA,
gg.UNSIGNED_BYTE,
img,
)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_WRAP_S, gg.CLAMP_TO_EDGE)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_WRAP_T, gg.CLAMP_TO_EDGE)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_MAG_FILTER, gg.LINEAR)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_MIN_FILTER, gg.LINEAR)
return tex
}
func newImageTexture(filename string) (*gg.Texture, error) {
f, err := os.Open(filename)
if err != nil {
return nil, err
}
img, err := png.Decode(f)
if err != nil {
return nil, err
}
var buf []byte
for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
r, g, b, a := img.At(x, y).RGBA()
buf = append(buf, byte(r/256))
buf = append(buf, byte(g/256))
buf = append(buf, byte(b/256))
buf = append(buf, byte(a/256))
}
}
tex := gg.CreateTexture()
gg.ActiveTexture(gg.TEXTURE0)
gg.Enable(gg.TEXTURE_2D)
gg.BindTexture(gg.TEXTURE_2D, tex)
gg.TexImage2D(
gg.TEXTURE_2D,
0,
gg.RGBA,
img.Bounds().Dx(),
img.Bounds().Dy(),
0,
gg.RGBA,
gg.UNSIGNED_BYTE,
buf,
)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_WRAP_S, gg.CLAMP_TO_EDGE)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_WRAP_T, gg.CLAMP_TO_EDGE)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_MAG_FILTER, gg.LINEAR)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_MIN_FILTER, gg.LINEAR)
return tex, nil
}
func NewTextureFromImage(img *js.Object) *gg.Texture {
tex := gg.CreateTexture()
gg.ActiveTexture(gg.TEXTURE0)
gg.BindTexture(gg.TEXTURE_2D, tex)
gg.TexImage2D(
gg.TEXTURE_2D,
0,
gg.RGBA,
-1, -1, -1, // ignored by gg/webgl
gg.RGBA,
gg.UNSIGNED_BYTE,
img,
)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_WRAP_S, gg.CLAMP_TO_EDGE)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_WRAP_T, gg.CLAMP_TO_EDGE)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_MAG_FILTER, gg.LINEAR)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_MIN_FILTER, gg.LINEAR)
return tex
}