func (c *newImageCommand) Exec(context *opengl.Context, indexOffsetInBytes int) error {
w := NextPowerOf2Int(c.width)
h := NextPowerOf2Int(c.height)
if w < 1 {
return errors.New("graphics: width must be equal or more than 1.")
}
if h < 1 {
return errors.New("graphics: height must be equal or more than 1.")
}
native, err := context.NewTexture(w, h, nil, c.filter)
if err != nil {
return err
}
c.result.texture = &texture{
native: native,
}
return nil
}
func (c *newImageFromImageCommand) Exec(context *opengl.Context, indexOffsetInBytes int) error {
origSize := c.img.Bounds().Size()
if origSize.X < 1 {
return errors.New("graphics: width must be equal or more than 1.")
}
if origSize.Y < 1 {
return errors.New("graphics: height must be equal or more than 1.")
}
w, h := c.img.Bounds().Size().X, c.img.Bounds().Size().Y
if c.img.Bounds() != image.Rect(0, 0, NextPowerOf2Int(w), NextPowerOf2Int(h)) {
panic(fmt.Sprintf("graphics: invalid image bounds: %v", c.img.Bounds()))
}
native, err := context.NewTexture(w, h, c.img.Pix, c.filter)
if err != nil {
return err
}
c.result.texture = &texture{
native: native,
}
return nil
}