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  [Solved]Saving GLCanvas into a BufferedImage  (Read 3190 times)
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Offline GLDavid

Senior Newbie




Java games rock!


« Posted 2004-03-23 12:55:21 »

Hello !

Is it possible to save the GLCanvas into a BufferedImage ?
If yes, what are the methods ?

Thank you very much.

Offline Sylvie

Senior Newbie




Java games rock!


« Reply #1 - Posted 2004-03-23 17:15:44 »

I think this has been discussed before but this is what I have done:

float[] vPixelBuffer = new float[pWidth * pHeight * 3];

// First read the frame buffer
gl.glReadPixels(
   0,
   0,
   pWidth,
   pHeight,
   GL.GL_RGB,
   GL.GL_FLOAT,
   vPixelBuffer);

BufferedImage vBufferedImage =
   new BufferedImage(pWidth, pHeight,
       BufferedImage.TYPE_INT_RGB);

// Copy pixel data into buffered image
for (int vRow = 0; vRow < pHeight; vRow++)
{
   for (int vColumn = 0; vColumn < pWidth; vColumn++)
   {
       // Get separate color components
       int vIndex = ((vRow * pWidth) + vColumn) * 3;
       int r = (int) (vPixelBuffer[vIndex] * 255);
       int g = (int) (vPixelBuffer[vIndex + 1] * 255);
       int b = (int) (vPixelBuffer[vIndex + 2] * 255);

       /*
        * Set rgb color by shifting components into corresponding
        * integer bits.
        */
       int vRgb = (r << 16) + (g << 8) + b;

       // Set buffer image pixel -- flip y coordinate
       vBufferedImage.setRGB(
           vColumn,
           pHeight - vRow - 1,
           vRgb);
   }
}

// do something with vBufferedImage


Also, I would interested if there was a more efficient way of converting the float pixel buffer into a BufferedImage. This is the first thing I could think of and I have since moved on to more pressing things.

Sean
Offline GLDavid

Senior Newbie




Java games rock!


« Reply #2 - Posted 2004-03-24 19:05:37 »

Very well Sylvie !  Grin
Thank you very much, your code is working very well !

Bye bye !
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline chris25

Senior Newbie




Java games rock!


« Reply #3 - Posted 2004-04-25 20:36:50 »

Hello everyone,
I am dealing with the same problem, but somehow i can't manage to get the code running right. When i create a picture from the BufferedImage, i only get a screen cotaining
the backgroundcolor from the glcanvas. It looks like the buffer is not read properly. I tried to copy the image several times while moving the object on the canvas. When the objects move outside the visible screen, somthing is showing up inside the bufferedimage, but it's only a square containing colors of the original image. Are there any parameters in the code i possibly have to adjust?

Thank you very much in advance,
Chris
Offline jan7da

Senior Newbie




Java games rock!


« Reply #4 - Posted 2004-04-27 19:59:25 »


I am not sure much,
but i had the same problem, where in glReadPixels was returnning all 'zeros'.

so I put glReadPixels in display() immediately after glFlush(). and things seem to work properly.

-j
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