From e552d800ee9df3761108c044342612c8bda1f304 Mon Sep 17 00:00:00 2001
From: Kenneth Russel <kbrussel@alum.mit.edu>
Date: Fri, 21 Jul 2006 22:34:00 +0000
Subject: Added support for sharing of textures, etc. between GLPbuffers and
GLJPanels when the Java2D/JOGL bridge is active on Mac OS X. This required
adding an alternate implementation for pbuffer drawables and contexts on OS X
which uses CGL rather than the NextStep OpenGL APIs. Tested with advance
Mustang bits on Mac OS X; Water and HWShadowmapsSimple demos (which use
pbuffers) are now working within the JRefract harness when the Java2D/JOGL
bridge is active.
git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@855 232f8b59-042b-4e1e-8c03-345bb8c30851
---
.../sun/opengl/impl/macosx/MacOSXGLDrawable.java | 41 ++++++++++++++++++++--
1 file changed, 39 insertions(+), 2 deletions(-)
(limited to 'src/classes/com/sun/opengl/impl/macosx/MacOSXGLDrawable.java')
diff --git a/src/classes/com/sun/opengl/impl/macosx/MacOSXGLDrawable.java b/src/classes/com/sun/opengl/impl/macosx/MacOSXGLDrawable.java
index 16f2410de..8a31d4b18 100644
--- a/src/classes/com/sun/opengl/impl/macosx/MacOSXGLDrawable.java
+++ b/src/classes/com/sun/opengl/impl/macosx/MacOSXGLDrawable.java
@@ -45,10 +45,42 @@ import com.sun.opengl.impl.*;
public abstract class MacOSXGLDrawable extends GLDrawableImpl {
protected static final boolean DEBUG = Debug.debug("MacOSXGLDrawable");
- protected long nsView; // NSView
protected GLCapabilities capabilities;
protected GLCapabilitiesChooser chooser;
+ // The Java2D/OpenGL pipeline on OS X uses low-level CGLContextObjs
+ // to represent the contexts for e.g. the Java2D back buffer. When
+ // the Java2D/JOGL bridge is active, this means that if we want to
+ // be able to share textures and display lists with the Java2D
+ // contexts, we need to use the CGL APIs rather than the NSOpenGL
+ // APIs on the JOGL side. For example, if we create a pbuffer using
+ // the NSOpenGL APIs and want to share textures and display lists
+ // between it and the Java2D back buffer, there is no way to do so,
+ // because the Java2D context is actually a CGLContextObj and the
+ // NSOpenGLContext's initWithFormat:shareContext: only accepts an
+ // NSOpenGLContext as its second argument. Of course there is no way
+ // to wrap an NSOpenGLContext around an arbitrary CGLContextObj.
+ //
+ // The situation we care most about is allowing a GLPbuffer to share
+ // textures, etc. with a GLJPanel when the Java2D/JOGL bridge is
+ // active; several of the demos rely on this functionality. We aim
+ // to get there by allowing a GLPBuffer to switch its implementation
+ // between using an NSOpenGLPixelBuffer and a CGLPBufferObj. In
+ // order to track whether this has been done we need to have the
+ // notion of a "mode" of both the MacOSXGLDrawable and the
+ // MacOSXGLContext. Initially the mode is "unspecified", meaning it
+ // leans toward the default (NSOpenGL). If sharing is requested
+ // between either a GLJPanel and a GLPbuffer or a GLCanvas and a
+ // GLPbuffer, the GLPbuffer will be switched into the appropriate
+ // mode: CGL mode for a GLJPanel and NSOpenGL mode for a GLCanvas.
+ // To avoid thrashing we support exactly one such switch during the
+ // lifetime of a given GLPbuffer. This is not a fully general
+ // solution (for example, you can't share textures among a
+ // GLPbuffer, a GLJPanel and a GLCanvas simultaneously) but should
+ // be enough to get things off the ground.
+ public static final int NSOPENGL_MODE = 1;
+ public static final int CGL_MODE = 2;
+
public MacOSXGLDrawable(GLCapabilities capabilities,
GLCapabilitiesChooser chooser) {
this.capabilities = (GLCapabilities) capabilities.clone();
@@ -83,11 +115,16 @@ public abstract class MacOSXGLDrawable extends GLDrawableImpl {
return availableCaps[pixelFormat];
}
+ // Only used for on-screen contexts
public long getView() {
- return nsView;
+ return 0;
}
protected static String getThreadName() {
return Thread.currentThread().getName();
}
+
+ // Support for "mode switching" as per above
+ public abstract void setOpenGLMode(int mode);
+ public abstract int getOpenGLMode();
}
--
cgit v1.2.3