func (tex *Texture) Unbind() {
bound := tex.bound()
if *bound == tex {
gl33.BindTexture(tex.Type, 0)
*bound = nil
}
}
func (tex *Texture) Bind(textureUnit int) {
if activeTexture != textureUnit {
gl33.ActiveTexture(gl33.Enum(gl33.TEXTURE0 + textureUnit))
activeTexture = textureUnit
}
bound := tex.bound()
if *bound != tex {
gl33.BindTexture(tex.Type, tex.Id)
*bound = tex
}
}
// LoadTexture buffers an image.Image into the graphic cards memory.
func LoadTexture(img image.Image) (*Texture, error) {
w := img.Bounds().Dx()
h := img.Bounds().Dy()
rgba := image.NewRGBA(image.Rect(0, 0, w, h))
for x := 0; x < w; x++ {
for y := 0; y < h; y++ {
rgba.Set(x, y, img.At(x, y))
}
}
var textureId gl.Uint
//gl.ActiveTexture(gl.TEXTURE0)
gl.GenTextures(1, &textureId)
gl.BindTexture(gl.TEXTURE_2D, textureId)
//gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexImage2D(gl.TEXTURE_2D, 0, 4, gl.Sizei(rgba.Rect.Dx()), gl.Sizei(rgba.Rect.Dy()), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&rgba.Pix[0]))
gl.BindTexture(gl.TEXTURE_2D, 0)
return &Texture{id: textureId}, nil
}
func (t *Texture) Unbind() {
gl.BindTexture(gl.TEXTURE_2D, 0)
}
func (t *Texture) Bind() {
gl.BindTexture(gl.TEXTURE_2D, t.id)
}