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  glDrawPixles  (Read 706 times)
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Offline cborders

Junior Member





« Posted 2005-08-09 15:42:25 »

I am trying to get a BufferedImage and extract the pixel data to feed into glDrawPixels(), but it keeps giving me an exception.  Here is the StackTrace:
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Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Number of remaining buffer elements is 502865, must be at least 1508598
   at org.lwjgl.BufferChecks.checkBufferSize(BufferChecks.java:177)
   at org.lwjgl.BufferChecks.checkBuffer(BufferChecks.java:187)
   at org.lwjgl.opengl.GL11.glDrawPixels(GL11.java:2026)
   at Canvas.paintGL(Canvas.java:123)
   at org.lwjgl.opengl.AWTGLCanvas.paint(AWTGLCanvas.java:256)
   at sun.awt.RepaintArea.paintComponent(Unknown Source)
   at sun.awt.RepaintArea.paint(Unknown Source)
   at sun.awt.windows.WComponentPeer.handleEvent(Unknown Source)
   at java.awt.Component.dispatchEventImpl(Unknown Source)
   at java.awt.Component.dispatchEvent(Unknown Source)
   at java.awt.EventQueue.dispatchEvent(Unknown Source)
   at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
   at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
   at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
   at java.awt.EventDispatchThread.run(Unknown Source)


and the relevant code:
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GraphicsConfiguration gc = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration();
        Image img = viewport.CreateImage(null);
        BufferedImage bufImg = gc.createCompatibleImage(img.getWidth(null), img.getHeight(null), Transparency.OPAQUE);

        System.out.println(bufImg);
       
        DataBuffer dataBuffer = bufImg.getData().getDataBuffer();
       
        IntBuffer image = IntBuffer.allocate(dataBuffer.getSize());
        image.put(dataBuffer.getOffsets());
       
        System.out.println("db.size: " + dataBuffer.getSize() + "\nib.rem: " + image.remaining());
       
        GL11.glDrawPixels(img.getWidth(null), img.getHeight(null), GL11.GL_RGB, GL11.GL_INT, image);


Can anyone help me figure this out?  I really have no idea how this works!
Offline princec

JGO Kernel


Medals: 282
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« Reply #1 - Posted 2005-08-10 00:07:06 »

(no need to reply, this was xposted from lwjgl.org)

Cas Smiley

Offline cborders

Junior Member





« Reply #2 - Posted 2005-08-10 14:07:50 »

Sorry, I didn't mean to cross post, but I guess that most of you do read both boards.  I'll keep that in mind for the future! Wink
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