Re: [gl4java-usergroup] Texture from image.io BufferedImage / Raster

[Andy L. <do...@ya...>]

Here is a method I am using that I found in the
Soya 3D engine (was used in the Arkanae game, I
have been using it and modifying it to keep it up
to date):

/**
   * Converts an awt.image to an array of byte,
with 3 color components for each pixel.
   * @param i the awt image
   * @return the image data
   */
  protected static byte[]
dataFromImageRGB(java.awt.Image i) throws
InterruptedException {
    int width  = i.getWidth (null);
    int height = i.getHeight(null);
    
    PixelGrabber pg = new PixelGrabber(i, 0, 0,
width, height, true);
    pg.startGrabbing();
    pg.grabPixels();
    
    Object o = pg.getPixels();
    if(o instanceof int[]) {
      byte[] data = new byte[width * height * 3];
      int[] p = (int[]) o;
      int j = 0;
      for(int k = 0; k < width * height; k++) {
        data[j++] = getRed  (p[k]);
        data[j++] = getGreen(p[k]);
        data[j++] = getBlue (p[k]);
      }
      return data;
    }
    return (byte[]) o;
  }

I hope that's something you were looking for.

Andy Lubbers

--- Peter Ashford <kaf...@xt...> wrote:
> Could anyone tell me how (or point me to code
> that shows how) to create 
> an opengl texture using gl4java from a image.io
> source (that is, an 
> image using the buffered image / raster
> classes).
> 
> My problem in particular is how to bridge
> between what I can get from 
> the Raster.getPixels method (an int array) and
> data that the openGL 
> texture creation functions are happy with. 
> (I'm used to doing this in 
> C, and dealing with the image data as an array
> of unsigned bytes)
> 
> Thanks in advance!
> 
> 
> 
>
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