func NewTexture(c *opengl.Context, width, height int, filter opengl.Filter) (*Texture, error) {
w := NextPowerOf2Int(width)
h := NextPowerOf2Int(height)
if w < 4 {
return nil, errors.New("width must be equal or more than 4.")
}
if h < 4 {
return nil, errors.New("height must be equal or more than 4.")
}
native, err := c.NewTexture(w, h, nil, filter)
if err != nil {
return nil, err
}
return &Texture{native, width, height}, nil
}
func NewTextureFromImage(c *opengl.Context, img image.Image, filter opengl.Filter) (*Texture, error) {
origSize := img.Bounds().Size()
if origSize.X < 4 {
return nil, errors.New("width must be equal or more than 4.")
}
if origSize.Y < 4 {
return nil, errors.New("height must be equal or more than 4.")
}
adjustedImage := adjustImageForTexture(img)
size := adjustedImage.Bounds().Size()
native, err := c.NewTexture(size.X, size.Y, adjustedImage.Pix, filter)
if err != nil {
return nil, err
}
return &Texture{native, origSize.X, origSize.Y}, nil
}