4759cb951e
osg::GraphicsContext, in order to give good integration with the application's GUI toolkit. This works really well. However, I need to share OpenGL texture resources with the standard osgViewer GraphicsContext implementations, in particular the PixelBuffers. This is essential for my application to conserve graphics memory on low-end hardware. Currently the standard osg implementations will not share resources with another derived osg::GraphicsContext, other than the pre-defined osgViewer classes e.g. PixelBufferX11 is hardcoded to only share resources with GraphicsWindowX11 and PixelBufferX11 objects, and no other osg::GraphicsContext object. To address this in the cleanest way I could think of, I have moved the OpenGL handle variables for each platform into a small utility class, e.g. GraphicsHandleX11 for unix. Then GraphicsWindowX11, PixelBufferX11 and any other derived osg::GraphicsContext class can inherit from GraphicsHandleX11 to share OpenGL resources. I have updated the X11, Win32 and Carbon implementations to use this. The changes are minor. I haven't touched the Cocoa implmentation as I'm not familiar with it at all and couldn't test it - it will work unchanged. Without this I had some horrible hacks in my application, this greatly simplifies things for me. It also simplifies the osgViewer implementations slightly. Perhaps it may help with other users' desires to share resources with external graphics contexts, as was discussed on the user list recently." Notes from Robert Osfield, adapted Colin's submission to work with the new EGL related changes.
117 lines
3.5 KiB
C++
117 lines
3.5 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
|
|
*
|
|
* This library is open source and may be redistributed and/or modified under
|
|
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
|
|
* (at your option) any later version. The full license is in LICENSE file
|
|
* included with this distribution, and on the openscenegraph.org website.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* OpenSceneGraph Public License for more details.
|
|
*/
|
|
|
|
|
|
|
|
#ifndef OSGVIEWER_PIXELBUFFERCARBON
|
|
#define OSGVIEWER_PIXELBUFFERCARBON 1
|
|
|
|
#if defined (__APPLE__) && (!__LP64__)
|
|
|
|
#include <osg/GraphicsContext>
|
|
#include <osgViewer/api/Carbon/GraphicsHandleCarbon>
|
|
|
|
|
|
namespace osgViewer
|
|
{
|
|
|
|
class OSGVIEWER_EXPORT PixelBufferCarbon : public osg::GraphicsContext, public osgViewer::GraphicsHandleCarbon
|
|
{
|
|
public:
|
|
|
|
PixelBufferCarbon(osg::GraphicsContext::Traits* traits):
|
|
_valid(false),
|
|
_initialized(false),
|
|
_realized(false),
|
|
_pixelformat(0),
|
|
_pbuffer(0)
|
|
{
|
|
_traits = traits;
|
|
|
|
init();
|
|
|
|
if (valid())
|
|
{
|
|
setState( new osg::State );
|
|
getState()->setGraphicsContext(this);
|
|
|
|
if (_traits.valid() && _traits->sharedContext)
|
|
{
|
|
getState()->setContextID( _traits->sharedContext->getState()->getContextID() );
|
|
incrementContextIDUsageCount( getState()->getContextID() );
|
|
}
|
|
else
|
|
{
|
|
getState()->setContextID( osg::GraphicsContext::createNewContextID() );
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
virtual bool isSameKindAs(const Object* object) const { return dynamic_cast<const PixelBufferCarbon*>(object)!=0; }
|
|
virtual const char* libraryName() const { return "osgViewer"; }
|
|
virtual const char* className() const { return "PixelBufferCarbon"; }
|
|
|
|
virtual bool valid() const { return _valid; }
|
|
|
|
/** Realise the GraphicsContext.*/
|
|
virtual bool realizeImplementation();
|
|
|
|
/** Return true if the graphics context has been realised and is ready to use.*/
|
|
virtual bool isRealizedImplementation() const { return _realized; }
|
|
|
|
/** Close the graphics context.*/
|
|
virtual void closeImplementation();
|
|
|
|
/** Make this graphics context current.*/
|
|
virtual bool makeCurrentImplementation();
|
|
|
|
/** Make this graphics context current with specified read context implementation. */
|
|
virtual bool makeContextCurrentImplementation(osg::GraphicsContext* readContext);
|
|
|
|
/** Release the graphics context.*/
|
|
virtual bool releaseContextImplementation();
|
|
|
|
/** Bind the graphics context to associated texture implementation.*/
|
|
virtual void bindPBufferToTextureImplementation( GLenum buffer );
|
|
|
|
/** Swap the front and back buffers.*/
|
|
virtual void swapBuffersImplementation();
|
|
|
|
static AGLPixelFormat createPixelFormat(osg::GraphicsContext::Traits* traits);
|
|
|
|
public:
|
|
|
|
|
|
protected:
|
|
|
|
|
|
|
|
~PixelBufferCarbon();
|
|
|
|
void init();
|
|
|
|
bool _valid;
|
|
bool _initialized;
|
|
bool _realized;
|
|
|
|
AGLPixelFormat _pixelformat;
|
|
AGLPbuffer _pbuffer;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|