Note that because this component attempts to use pbuffers for rendering, and because pbuffers can not be resized, somewhat surprising behavior may occur during resize operations; the {@link GLEventListener#init} method may be called multiple times as the pbuffer is resized to be able to cover the size of the GLJPanel. This behavior is correct, as the textures and display lists for the GLJPanel will have been lost during the resize operation. The application should attempt to make its GLEventListener.init() methods as side-effect-free as possible.
The GLJPanel can be made transparent by creating it with a
GLCapabilities object with alpha bits specified and calling {@link
#setOpaque}(false). Pixels with resulting OpenGL alpha values less
than 1.0 will be overlaid on any underlying Swing rendering.
*/
public class GLJPanel extends JPanel implements GLAutoDrawable {
private static final boolean DEBUG = Debug.debug("GLJPanel");
private static final boolean VERBOSE = Debug.verbose();
private GLDrawableHelper drawableHelper = new GLDrawableHelper();
private volatile boolean isInitialized;
private volatile boolean shouldInitialize = false;
// Data used for either pbuffers or pixmap-based offscreen surfaces
private GLCapabilities offscreenCaps;
private GLCapabilitiesChooser chooser;
private GLContext shareWith;
// This image is exactly the correct size to render into the panel
private BufferedImage offscreenImage;
// One of these is used to store the read back pixels before storing
// in the BufferedImage
private ByteBuffer readBackBytes;
private IntBuffer readBackInts;
private int readBackWidthInPixels;
private int readBackHeightInPixels;
// Width of the actual GLJPanel
private int panelWidth = 0;
private int panelHeight = 0;
private Updater updater;
private int awtFormat;
private int glFormat;
private int glType;
// Lazy reshape notification
private boolean handleReshape = false;
private boolean sendReshape = true;
// Implementation using pbuffers
private static boolean hardwareAccelerationDisabled =
Debug.isPropertyDefined("jogl.gljpanel.nohw");
private static boolean softwareRenderingDisabled =
Debug.isPropertyDefined("jogl.gljpanel.nosw");
private GLPbuffer pbuffer;
private int pbufferWidth = 256;
private int pbufferHeight = 256;
// Implementation using software rendering
private GLDrawableImpl offscreenDrawable;
private GLContextImpl offscreenContext;
// For handling reshape events lazily
private int reshapeX;
private int reshapeY;
private int reshapeWidth;
private int reshapeHeight;
// For saving/restoring of OpenGL state during ReadPixels
private int[] swapbytes = new int[1];
private int[] rowlength = new int[1];
private int[] skiprows = new int[1];
private int[] skippixels = new int[1];
private int[] alignment = new int[1];
// Implementation using Java2D OpenGL pipeline's back buffer
private static boolean swingBufferPerWindow =
Debug.isPropertyDefined("swing.bufferPerWindow") ?
Debug.getBooleanProperty("swing.bufferPerWindow") :
true;
private boolean oglPipelineEnabled =
Java2D.isOGLPipelineActive() &&
!Debug.isPropertyDefined("jogl.gljpanel.noogl");
// Opaque Object identifier representing the Java2D surface we are
// drawing to; used to determine when to destroy and recreate JOGL
// context
private Object j2dSurface;
// Graphics object being used during Java2D update action
// (absolutely essential to cache this)
private Graphics cached2DGraphics;
// No-op context representing the Java2D OpenGL context
private GLContext j2dContext;
// Context associated with no-op drawable representing the JOGL
// OpenGL context
private GLDrawable joglDrawable;
// The real OpenGL context JOGL uses to render
private GLContext joglContext;
// State captured from Java2D OpenGL context necessary in order to
// properly render into Java2D back buffer
private int[] drawBuffer = new int[1];
private int[] readBuffer = new int[1];
// These are always set to (0, 0) except when the Java2D / OpenGL
// pipeline is active
private int viewportX;
private int viewportY;
/** Creates a new GLJPanel component. The passed GLCapabilities must
be non-null and specifies the OpenGL capabilities for the
component. The GLCapabilitiesChooser must be non-null and
specifies the algorithm for selecting one of the available
GLCapabilities for the component; the GLDrawableFactory uses a
DefaultGLCapabilitiesChooser if the user does not provide
one. The passed GLContext may be null and specifies an OpenGL
context with which to share textures, display lists and other
OpenGL state. */
protected GLJPanel(GLCapabilities capabilities, GLCapabilitiesChooser chooser, GLContext shareWith) {
super();
// Works around problems on many vendors' cards; we don't need a
// back buffer for the offscreen surface anyway
if (capabilities != null) {
offscreenCaps = (GLCapabilities) capabilities.clone();
} else {
offscreenCaps = new GLCapabilities();
}
offscreenCaps.setDoubleBuffered(false);
this.chooser = ((chooser != null) ? chooser : new DefaultGLCapabilitiesChooser());
this.shareWith = shareWith;
}
public void display() {
if (EventQueue.isDispatchThread()) {
// Want display() to be synchronous, so call paintImmediately()
paintImmediately(0, 0, getWidth(), getHeight());
} else {
// Multithreaded redrawing of Swing components is not allowed,
// so do everything on the event dispatch thread
try {
EventQueue.invokeAndWait(paintImmediatelyAction);
} catch (Exception e) {
throw new GLException(e);
}
}
}
private void captureJ2DState(GL gl) {
gl.glGetIntegerv(GL.GL_DRAW_BUFFER, drawBuffer, 0);
gl.glGetIntegerv(GL.GL_READ_BUFFER, readBuffer, 0);
}
private boolean preGL(Graphics g) {
GL gl = joglContext.getGL();
// Set up needed state in JOGL context from Java2D context
gl.glEnable(GL.GL_SCISSOR_TEST);
Rectangle r = Java2D.getOGLScissorBox(g);
if (r == null) {
return false;
}
gl.glScissor(r.x, r.y, r.width, r.height);
Rectangle oglViewport = Java2D.getOGLViewport(g, panelWidth, panelHeight);
// If the viewport X or Y changes, in addition to the panel's
// width or height, we need to send a reshape operation to the
// client
if ((viewportX != oglViewport.x) ||
(viewportY != oglViewport.y)) {
sendReshape = true;
if (DEBUG) {
System.err.println("Sending reshape because viewport changed");
System.err.println(" viewportX (" + viewportX + ") ?= oglViewport.x (" + oglViewport.x + ")");
System.err.println(" viewportY (" + viewportY + ") ?= oglViewport.y (" + oglViewport.y + ")");
}
}
viewportX = oglViewport.x;
viewportY = oglViewport.y;
gl.glDrawBuffer(drawBuffer[0]);
gl.glReadBuffer(readBuffer[0]);
return true;
}
/** Overridden from JComponent; calls event listeners' {@link
GLEventListener#display display} methods. Should not be invoked
by applications directly. */
protected void paintComponent(final Graphics g) {
if (shouldInitialize) {
initialize();
}
if (!isInitialized) {
return;
}
// NOTE: must do this when the context is not current as it may
// involve destroying the pbuffer (current context) and
// re-creating it -- tricky to do properly while the context is
// current
if (handleReshape) {
handleReshape();
}
updater.setGraphics(g);
if (oglPipelineEnabled) {
Java2D.invokeWithOGLContextCurrent(g, new Runnable() {
public void run() {
// Create no-op context representing Java2D context
if (j2dContext == null) {
j2dContext = GLDrawableFactory.getFactory().createExternalGLContext();
// Check to see whether we can support the requested
// capabilities or need to fall back to a pbuffer
// FIXME: add more checks?
GL gl = j2dContext.getGL();
if ((getGLInteger(gl, GL.GL_RED_BITS) < offscreenCaps.getRedBits()) ||
(getGLInteger(gl, GL.GL_GREEN_BITS) < offscreenCaps.getGreenBits()) ||
(getGLInteger(gl, GL.GL_BLUE_BITS) < offscreenCaps.getBlueBits()) ||
// (getGLInteger(gl, GL.GL_ALPHA_BITS) < offscreenCaps.getAlphaBits()) ||
(getGLInteger(gl, GL.GL_ACCUM_RED_BITS) < offscreenCaps.getAccumRedBits()) ||
(getGLInteger(gl, GL.GL_ACCUM_GREEN_BITS) < offscreenCaps.getAccumGreenBits()) ||
(getGLInteger(gl, GL.GL_ACCUM_BLUE_BITS) < offscreenCaps.getAccumBlueBits()) ||
(getGLInteger(gl, GL.GL_ACCUM_ALPHA_BITS) < offscreenCaps.getAccumAlphaBits()) ||
// (getGLInteger(gl, GL.GL_DEPTH_BITS) < offscreenCaps.getDepthBits()) ||
(getGLInteger(gl, GL.GL_STENCIL_BITS) < offscreenCaps.getStencilBits())) {
if (DEBUG) {
System.err.println("GLJPanel: Falling back to pbuffer-based support because Java2D context insufficient");
System.err.println(" Available Required");
System.err.println("GL_RED_BITS " + getGLInteger(gl, GL.GL_RED_BITS) + " " + offscreenCaps.getRedBits());
System.err.println("GL_GREEN_BITS " + getGLInteger(gl, GL.GL_GREEN_BITS) + " " + offscreenCaps.getGreenBits());
System.err.println("GL_BLUE_BITS " + getGLInteger(gl, GL.GL_BLUE_BITS) + " " + offscreenCaps.getBlueBits());
System.err.println("GL_ALPHA_BITS " + getGLInteger(gl, GL.GL_ALPHA_BITS) + " " + offscreenCaps.getAlphaBits());
System.err.println("GL_ACCUM_RED_BITS " + getGLInteger(gl, GL.GL_ACCUM_RED_BITS) + " " + offscreenCaps.getAccumRedBits());
System.err.println("GL_ACCUM_GREEN_BITS " + getGLInteger(gl, GL.GL_ACCUM_GREEN_BITS) + " " + offscreenCaps.getAccumGreenBits());
System.err.println("GL_ACCUM_BLUE_BITS " + getGLInteger(gl, GL.GL_ACCUM_BLUE_BITS) + " " + offscreenCaps.getAccumBlueBits());
System.err.println("GL_ACCUM_ALPHA_BITS " + getGLInteger(gl, GL.GL_ACCUM_ALPHA_BITS) + " " + offscreenCaps.getAccumAlphaBits());
System.err.println("GL_DEPTH_BITS " + getGLInteger(gl, GL.GL_DEPTH_BITS) + " " + offscreenCaps.getDepthBits());
System.err.println("GL_STENCIL_BITS " + getGLInteger(gl, GL.GL_STENCIL_BITS) + " " + offscreenCaps.getStencilBits());
}
isInitialized = false;
shouldInitialize = true;
oglPipelineEnabled = false;
handleReshape = true;
j2dContext.destroy();
j2dContext = null;
return;
}
}
j2dContext.makeCurrent();
try {
captureJ2DState(j2dContext.getGL());
Object curSurface = Java2D.getOGLSurfaceIdentifier(g);
if (curSurface != null) {
if (j2dSurface != curSurface) {
if (joglContext != null) {
joglContext.destroy();
joglContext = null;
joglDrawable = null;
sendReshape = true;
if (DEBUG) {
System.err.println("Sending reshape because surface changed");
System.err.println("New surface = " + curSurface);
}
}
j2dSurface = curSurface;
}
if (joglContext == null) {
joglDrawable = GLDrawableFactory.getFactory().createExternalGLDrawable();
joglContext = joglDrawable.createContext(shareWith);
}
drawableHelper.invokeGL(joglDrawable, joglContext, displayAction, initAction);
}
} finally {
j2dContext.release();
}
}
});
} else {
if (!hardwareAccelerationDisabled) {
pbuffer.display();
} else {
drawableHelper.invokeGL(offscreenDrawable, offscreenContext, displayAction, initAction);
}
}
}
/** Overridden from JPanel; used to indicate that an OpenGL context
may be created for the component. */
public void addNotify() {
super.addNotify();
shouldInitialize = true;
if (DEBUG) {
System.err.println("GLJPanel.addNotify()");
}
}
/** Overridden from JPanel; used to indicate that it's no longer
safe to have an OpenGL context for the component. */
public void removeNotify() {
if (DEBUG) {
System.err.println("GLJPanel.removeNotify()");
}
if (oglPipelineEnabled) {
Java2D.invokeWithOGLContextCurrent(null, new Runnable() {
public void run() {
if (joglContext != null) {
joglContext.destroy();
joglContext = null;
}
joglDrawable = null;
if (j2dContext != null) {
j2dContext.destroy();
j2dContext = null;
}
}
});
} else {
if (!hardwareAccelerationDisabled) {
if (pbuffer != null) {
pbuffer.destroy();
pbuffer = null;
}
} else {
if (offscreenContext != null) {
offscreenContext.destroy();
offscreenContext = null;
}
if (offscreenDrawable != null) {
offscreenDrawable.destroy();
offscreenDrawable = null;
}
}
}
isInitialized = false;
super.removeNotify();
}
/** Overridden from Canvas; causes {@link GLEventListener#reshape
reshape} to be called on all registered {@link
GLEventListener}s. Called automatically by the AWT; should not
be invoked by applications directly. */
public void reshape(int x, int y, int width, int height) {
super.reshape(x, y, width, height);
reshapeX = x;
reshapeY = y;
reshapeWidth = width;
reshapeHeight = height;
handleReshape = true;
}
public void setOpaque(boolean opaque) {
if (opaque != isOpaque()) {
if (offscreenImage != null) {
offscreenImage.flush();
offscreenImage = null;
}
}
super.setOpaque(opaque);
}
public void addGLEventListener(GLEventListener listener) {
drawableHelper.addGLEventListener(listener);
}
public void removeGLEventListener(GLEventListener listener) {
drawableHelper.removeGLEventListener(listener);
}
public GLContext createContext(GLContext shareWith) {
if (!hardwareAccelerationDisabled) {
return pbuffer.createContext(shareWith);
} else {
return offscreenDrawable.createContext(shareWith);
}
}
public void setRealized(boolean realized) {
}
public GLContext getContext() {
if (oglPipelineEnabled) {
return joglContext;
} else {
if (!hardwareAccelerationDisabled) {
return pbuffer.getContext();
} else {
return offscreenContext;
}
}
}
public GL getGL() {
GLContext context = getContext();
return (context == null) ? null : context.getGL();
}
public void setGL(GL gl) {
GLContext context = getContext();
if (context != null) {
context.setGL(gl);
}
}
public void setAutoSwapBufferMode(boolean onOrOff) {
if (!hardwareAccelerationDisabled) {
pbuffer.setAutoSwapBufferMode(onOrOff);
} else {
drawableHelper.setAutoSwapBufferMode(onOrOff);
}
}
public boolean getAutoSwapBufferMode() {
if (!hardwareAccelerationDisabled) {
return pbuffer.getAutoSwapBufferMode();
} else {
return drawableHelper.getAutoSwapBufferMode();
}
}
public void swapBuffers() {
if (!hardwareAccelerationDisabled) {
pbuffer.swapBuffers();
} else {
drawableHelper.invokeGL(offscreenDrawable, offscreenContext, swapBuffersAction, initAction);
}
}
/** For a translucent GLJPanel (one for which {@link #setOpaque
setOpaque}(false) has been called), indicates whether the
application should preserve the OpenGL color buffer
(GL_COLOR_BUFFER_BIT) for correct rendering of the GLJPanel and
underlying widgets which may show through portions of the
GLJPanel with alpha values less than 1. Most Swing
implementations currently expect the GLJPanel to be completely
cleared (e.g., by glClear(GL_COLOR_BUFFER_BIT |
GL_DEPTH_BUFFER_BIT)), but for certain optimized Swing
implementations which use OpenGL internally, it may be possible
to perform OpenGL rendering using the GLJPanel into the same
OpenGL drawable as the Swing implementation uses. */
public boolean shouldPreserveColorBufferIfTranslucent() {
return oglPipelineEnabled;
}
//----------------------------------------------------------------------
// Internals only below this point
//
private void initialize() {
if (panelWidth == 0 ||
panelHeight == 0) {
// See whether we have a non-zero size yet and can go ahead with
// initialization
if (reshapeWidth == 0 ||
reshapeHeight == 0) {
return;
}
// Pull down reshapeWidth and reshapeHeight into panelWidth and
// panelHeight eagerly in order to complete initialization, and
// force a reshape later
panelWidth = reshapeWidth;
panelHeight = reshapeHeight;
}
if (!oglPipelineEnabled) {
// Initialize either the hardware-accelerated rendering path or
// the lightweight rendering path
if (!hardwareAccelerationDisabled) {
if (GLDrawableFactory.getFactory().canCreateGLPbuffer()) {
if (pbuffer != null) {
throw new InternalError("Creating pbuffer twice without destroying it (memory leak / correctness bug)");
}
try {
pbuffer = GLDrawableFactory.getFactory().createGLPbuffer(offscreenCaps,
pbufferWidth,
pbufferHeight,
shareWith);
updater = new Updater();
pbuffer.addGLEventListener(updater);
shouldInitialize = false;
isInitialized = true;
return;
} catch (GLException e) {
if (DEBUG) {
e.printStackTrace();
System.err.println("GLJPanel: Falling back on software rendering because of problems creating pbuffer");
}
hardwareAccelerationDisabled = true;
}
} else {
if (DEBUG) {
System.err.println("GLJPanel: Falling back on software rendering because no pbuffer support");
}
// If the factory reports that it can't create a pbuffer,
// don't try again the next time, and fall through to the
// software rendering path
hardwareAccelerationDisabled = true;
}
}
if (softwareRenderingDisabled) {
throw new GLException("Fallback to software rendering disabled by user");
}
// Fall-through path: create an offscreen context instead
offscreenDrawable = GLDrawableFactoryImpl.getFactoryImpl().createOffscreenDrawable(offscreenCaps, chooser);
offscreenDrawable.setSize(Math.max(1, panelWidth), Math.max(1, panelHeight));
offscreenContext = (GLContextImpl) offscreenDrawable.createContext(shareWith);
offscreenContext.setSynchronized(true);
}
updater = new Updater();
shouldInitialize = false;
isInitialized = true;
}
private void handleReshape() {
readBackWidthInPixels = 0;
readBackHeightInPixels = 0;
panelWidth = reshapeWidth;
panelHeight = reshapeHeight;
if (DEBUG) {
System.err.println("GLJPanel.handleReshape: (w,h) = (" +
panelWidth + "," + panelHeight + ")");
}
sendReshape = true;
if (!oglPipelineEnabled) {
if (!hardwareAccelerationDisabled) {
// Use factor larger than 2 during shrinks for some hysteresis
float shrinkFactor = 2.5f;
if ((panelWidth > pbufferWidth ) || (panelHeight > pbufferHeight) ||
(panelWidth < (pbufferWidth / shrinkFactor)) || (panelHeight < (pbufferWidth / shrinkFactor))) {
if (DEBUG) {
System.err.println("Resizing pbuffer from (" + pbufferWidth + ", " + pbufferHeight + ") " +
" to fit (" + panelWidth + ", " + panelHeight + ")");
}
// Must destroy and recreate pbuffer to fit
if (pbuffer != null) {
pbuffer.destroy();
}
pbuffer = null;
isInitialized = false;
pbufferWidth = getNextPowerOf2(panelWidth);
pbufferHeight = getNextPowerOf2(panelHeight);
if (DEBUG) {
System.err.println("New pbuffer size is (" + pbufferWidth + ", " + pbufferHeight + ")");
}
initialize();
}
// It looks like NVidia's drivers (at least the ones on my
// notebook) are buggy and don't allow a rectangle of less than
// the pbuffer's width to be read...this doesn't really matter
// because it's the Graphics.drawImage() calls that are the
// bottleneck. Should probably make the size of the offscreen
// image be the exact size of the pbuffer to save some work on
// resize operations...
readBackWidthInPixels = pbufferWidth;
readBackHeightInPixels = panelHeight;
} else {
offscreenContext.destroy();
offscreenDrawable.setSize(Math.max(1, panelWidth), Math.max(1, panelHeight));
readBackWidthInPixels = Math.max(1, panelWidth);
readBackHeightInPixels = Math.max(1, panelHeight);
}
if (offscreenImage != null) {
offscreenImage.flush();
offscreenImage = null;
}
}
handleReshape = false;
}
// FIXME: it isn't clear whether this works any more given that
// we're accessing the GLDrawable inside of the GLPbuffer directly
// up in reshape() -- need to rethink and clean this up
class Updater implements GLEventListener {
private Graphics g;
public void setGraphics(Graphics g) {
this.g = g;
}
public void init(GLAutoDrawable drawable) {
if (oglPipelineEnabled) {
if (!preGL(g)) {
return;
}
}
drawableHelper.init(GLJPanel.this);
}
public void display(GLAutoDrawable drawable) {
if (oglPipelineEnabled) {
if (!preGL(g)) {
return;
}
}
if (sendReshape) {
if (DEBUG) {
System.err.println("glViewport(" + viewportX + ", " + viewportY + ", " + panelWidth + ", " + panelHeight + ")");
}
getGL().glViewport(viewportX, viewportY, panelWidth, panelHeight);
drawableHelper.reshape(GLJPanel.this, viewportX, viewportY, panelWidth, panelHeight);
sendReshape = false;
}
drawableHelper.display(GLJPanel.this);
if (!oglPipelineEnabled) {
// Must now copy pixels from offscreen context into surface
if (offscreenImage == null) {
if (panelWidth > 0 && panelHeight > 0) {
// It looks like NVidia's drivers (at least the ones on my
// notebook) are buggy and don't allow a sub-rectangle to be
// read from a pbuffer...this doesn't really matter because
// it's the Graphics.drawImage() calls that are the
// bottleneck
int awtFormat = 0;
int hwGLFormat = 0;
if (!hardwareAccelerationDisabled) {
// This seems to be a good choice on all platforms
hwGLFormat = GL.GL_UNSIGNED_INT_8_8_8_8_REV;
}
// Should be more flexible in these BufferedImage formats;
// perhaps see what the preferred image types are on the
// given platform
if (isOpaque()) {
awtFormat = BufferedImage.TYPE_INT_RGB;
} else {
awtFormat = BufferedImage.TYPE_INT_ARGB;
}
offscreenImage = new BufferedImage(panelWidth,
panelHeight,
awtFormat);
switch (awtFormat) {
case BufferedImage.TYPE_3BYTE_BGR:
glFormat = GL.GL_BGR;
glType = GL.GL_UNSIGNED_BYTE;
readBackBytes = ByteBuffer.allocate(readBackWidthInPixels * readBackHeightInPixels * 3);
break;
case BufferedImage.TYPE_INT_RGB:
case BufferedImage.TYPE_INT_ARGB:
glFormat = GL.GL_BGRA;
glType = (hardwareAccelerationDisabled
? offscreenContext.getOffscreenContextPixelDataType()
: hwGLFormat);
readBackInts = IntBuffer.allocate(readBackWidthInPixels * readBackHeightInPixels);
break;
default:
// FIXME: Support more off-screen image types (current
// offscreen context implementations don't use others, and
// some of the OpenGL formats aren't supported in the 1.1
// headers, which we're currently using)
throw new GLException("Unsupported offscreen image type " + awtFormat);
}
}
}
if (offscreenImage != null) {
GL gl = getGL();
// Save current modes
gl.glGetIntegerv(GL.GL_PACK_SWAP_BYTES, swapbytes, 0);
gl.glGetIntegerv(GL.GL_PACK_ROW_LENGTH, rowlength, 0);
gl.glGetIntegerv(GL.GL_PACK_SKIP_ROWS, skiprows, 0);
gl.glGetIntegerv(GL.GL_PACK_SKIP_PIXELS, skippixels, 0);
gl.glGetIntegerv(GL.GL_PACK_ALIGNMENT, alignment, 0);
gl.glPixelStorei(GL.GL_PACK_SWAP_BYTES, GL.GL_FALSE);
gl.glPixelStorei(GL.GL_PACK_ROW_LENGTH, readBackWidthInPixels);
gl.glPixelStorei(GL.GL_PACK_SKIP_ROWS, 0);
gl.glPixelStorei(GL.GL_PACK_SKIP_PIXELS, 0);
gl.glPixelStorei(GL.GL_PACK_ALIGNMENT, 1);
// Actually read the pixels.
gl.glReadBuffer(GL.GL_FRONT);
if (readBackBytes != null) {
gl.glReadPixels(0, 0, readBackWidthInPixels, readBackHeightInPixels, glFormat, glType, readBackBytes);
} else if (readBackInts != null) {
gl.glReadPixels(0, 0, readBackWidthInPixels, readBackHeightInPixels, glFormat, glType, readBackInts);
}
// Restore saved modes.
gl.glPixelStorei(GL.GL_PACK_SWAP_BYTES, swapbytes[0]);
gl.glPixelStorei(GL.GL_PACK_ROW_LENGTH, rowlength[0]);
gl.glPixelStorei(GL.GL_PACK_SKIP_ROWS, skiprows[0]);
gl.glPixelStorei(GL.GL_PACK_SKIP_PIXELS, skippixels[0]);
gl.glPixelStorei(GL.GL_PACK_ALIGNMENT, alignment[0]);
if (readBackBytes != null || readBackInts != null) {
// Copy temporary data into raster of BufferedImage for faster
// blitting Note that we could avoid this copy in the cases
// where !offscreenContext.offscreenImageNeedsVerticalFlip(),
// but that's the software rendering path which is very slow
// anyway
Object src = null;
Object dest = null;
int srcIncr = 0;
int destIncr = 0;
if (readBackBytes != null) {
src = readBackBytes.array();
dest = ((DataBufferByte) offscreenImage.getRaster().getDataBuffer()).getData();
srcIncr = readBackWidthInPixels * 3;
destIncr = offscreenImage.getWidth() * 3;
} else {
src = readBackInts.array();
dest = ((DataBufferInt) offscreenImage.getRaster().getDataBuffer()).getData();
srcIncr = readBackWidthInPixels;
destIncr = offscreenImage.getWidth();
}
if (!hardwareAccelerationDisabled ||
offscreenContext.offscreenImageNeedsVerticalFlip()) {
int srcPos = 0;
int destPos = (offscreenImage.getHeight() - 1) * destIncr;
for (; destPos >= 0; srcPos += srcIncr, destPos -= destIncr) {
System.arraycopy(src, srcPos, dest, destPos, destIncr);
}
} else {
int srcPos = 0;
int destEnd = destIncr * offscreenImage.getHeight();
for (int destPos = 0; destPos < destEnd; srcPos += srcIncr, destPos += destIncr) {
System.arraycopy(src, srcPos, dest, destPos, destIncr);
}
}
// Draw resulting image in one shot
g.drawImage(offscreenImage, 0, 0, offscreenImage.getWidth(), offscreenImage.getHeight(), GLJPanel.this);
}
}
} else {
// Cause OpenGL pipeline to flush its results because
// otherwise it's possible we will buffer up multiple frames'
// rendering results, resulting in apparent mouse lag
GL gl = getGL();
gl.glFinish();
}
}
public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
// This is handled above and dispatched directly to the appropriate context
}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {
}
}
class InitAction implements Runnable {
public void run() {
updater.init(GLJPanel.this);
}
}
private InitAction initAction = new InitAction();
class DisplayAction implements Runnable {
public void run() {
updater.display(GLJPanel.this);
}
}
private DisplayAction displayAction = new DisplayAction();
// This one is used exclusively in the non-hardware-accelerated case
class SwapBuffersAction implements Runnable {
public void run() {
offscreenDrawable.swapBuffers();
}
}
private SwapBuffersAction swapBuffersAction = new SwapBuffersAction();
class PaintImmediatelyAction implements Runnable {
public void run() {
paintImmediately(0, 0, getWidth(), getHeight());
}
}
private PaintImmediatelyAction paintImmediatelyAction = new PaintImmediatelyAction();
private int getNextPowerOf2(int number) {
// Workaround for problems where 0 width or height are transiently
// seen during layout
if (number == 0) {
return 2;
}
if (((number-1) & number) == 0) {
//ex: 8 -> 0b1000; 8-1=7 -> 0b0111; 0b1000&0b0111 == 0
return number;
}
int power = 0;
while (number > 0) {
number = number>>1;
power++;
}
return (1<