9d0c950bb0
The win32 pbuffer implementation returned an error unless both the WGL_ARB_pbuffer and the WGL_ARB_render_texture functions were present. This was too restrictive, as a pbuffer can usefully be created without render-to-texture, e.g. for use with glReadPixels. The osg 1.2/Producer pbuffers worked without RTT, and osgUtil::RenderStage has all the code to handle both RTT and non-RTT pbuffers, doing a read and copy in the latter case. With these changes I have successfully tested the osgprerender example on a graphics card which supports RTT, and one which doesn't. Plus tested in my own application. In order to aid diagnostics I have also added more function status return checks, and associated error messages. I have included the win32 error text in all error messages output. And there were some errors with multi-threaded handling of "bind to texture" and a temporary window context which I have corrected. These is one (pre-existing) problem with multi-threaded use of pbuffers in osgViewer & osgprerender, which I have not been able to fix. A win32 device context (HDC) can only be destroyed from the thread that created it. The pbuffers for pre-render cameras are created in osgUtil::RenderStage::runCameraSetUp, from the draw thread. But closeImplementation is normally invoked from the destructor in the main application thread. With the additional error messages I have added, osgprerender will now output a couple of warnings from osgViewer::PixelBufferWin32::closeImplementation() at exit, after running multi-threaded on windows. I think that is a good thing, to highlight the problem. I looked into fixing it in osgViewer::Renderer & osgUtil::RenderStage, but it was too involved for me. My own application requirements are only single-threaded. Unrelated fix - an uninitialised variable in osg::GraphicsThread::FlushDeletedGLObjectsOperation(). "
93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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/* Note, elements of PixeBufferWin32 have used Producer/RenderSurface_Win32.cpp as both
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* a guide to use of X11/GLX and copiying directly in the case of setBorder().
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* These elements are license under OSGPL as above, with Copyright (C) 2001-2004 Don Burns.
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*/
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#ifndef OSGVIEWER_PIXELBUFFERWIN32
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#define OSGVIEWER_PIXELBUFFERWIN32 1
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#include <osgViewer/GraphicsWindow>
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#ifndef _WIN32_WINNT
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#define _WIN32_WINNT 0x0500
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#endif
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#include <windows.h>
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namespace osgViewer
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{
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class OSGVIEWER_EXPORT PixelBufferWin32 : public osg::GraphicsContext
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{
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public:
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PixelBufferWin32(osg::GraphicsContext::Traits* traits);
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virtual ~PixelBufferWin32();
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virtual bool isSameKindAs(const Object* object) const { return dynamic_cast<const PixelBufferWin32*>(object)!=0; }
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virtual const char* libraryName() const { return "osgViewer"; }
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virtual const char* className() const { return "PixelBufferWin32"; }
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virtual bool valid() const { return _valid; }
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/** Realize the GraphicsContext.*/
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virtual bool realizeImplementation();
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/** Return true if the graphics context has been realized and is ready to use.*/
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virtual bool isRealizedImplementation() const { return _realized; }
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/** Close the graphics context.*/
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virtual void closeImplementation();
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/** Make this graphics context current.*/
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virtual bool makeCurrentImplementation();
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virtual bool makeContextCurrentImplementation( GraphicsContext* /*readContext*/ );
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/** Release the graphics context.*/
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virtual bool releaseContextImplementation();
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/** Swap the front and back buffers.*/
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virtual void swapBuffersImplementation();
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/** Get native window.*/
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HWND getHWND() const { return _hwnd; }
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HDC getHDC() const { return _hdc; }
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/** Get native OpenGL graphics context.*/
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HGLRC getWGLContext() const { return _hglrc; }
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virtual void bindPBufferToTextureImplementation( GLenum /*buffer*/ );
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protected:
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void init();
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HWND _hwnd;
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HDC _hdc;
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HGLRC _hglrc;
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bool _initialized;
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bool _valid;
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bool _realized;
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int _boundBuffer;
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};
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}
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#endif
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