From Tim Moore, "This contains a couple of fixes to support changing FrameBufferObject configurations on the fly; the user changes the camera attachments and calls Renderer::setCameraRequiresSetUp(). The major part of this submission is a comprehensive example of setting up floating point depth buffers. The user can change the near plane value and cycle through the available combinations of depth format and multisample buffer formats."

examples/CMakeLists.txt

@@ -40,6 +40,7 @@ IF(DYNAMIC_OPENSCENEGRAPH)
     ADD_SUBDIRECTORY(osgfadetext)
     ADD_SUBDIRECTORY(osgfont)
     ADD_SUBDIRECTORY(osgforest)
+    ADD_SUBDIRECTORY(osgfpdepth)
     ADD_SUBDIRECTORY(osgfxbrowser)
     ADD_SUBDIRECTORY(osgoutline)
     ADD_SUBDIRECTORY(osggameoflife)

examples/osgfpdepth/CMakeLists.txt

@@ -0,0 +1,4 @@
+SET(TARGET_SRC osgfpdepth.cpp )
+
+#### end var setup  ###
+SETUP_EXAMPLE(osgfpdepth)

include/osg/FrameBufferObject

@@ -153,6 +153,7 @@ namespace osg
         typedef void APIENTRY TglFramebufferRenderbuffer(GLenum, GLenum, GLenum, GLuint);
         typedef void APIENTRY TglGenerateMipmap(GLenum);
         typedef void APIENTRY TglBlitFramebuffer(GLint, GLint, GLint, GLint, GLint, GLint, GLint, GLint, GLbitfield, GLenum);
+        typedef void APIENTRY TglGetRenderbufferParameteriv(GLenum, GLenum, GLint*);
 
         TglBindRenderbuffer* glBindRenderbuffer;
         TglGenRenderbuffers* glGenRenderbuffers;
@@ -171,6 +172,7 @@ namespace osg
         TglFramebufferRenderbuffer* glFramebufferRenderbuffer;
         TglGenerateMipmap* glGenerateMipmap;
         TglBlitFramebuffer* glBlitFramebuffer;
+        TglGetRenderbufferParameteriv* glGetRenderbufferParameteriv;
 
         static FBOExtensions* instance(unsigned contextID, bool createIfNotInitalized);
 

include/osgViewer/Renderer

@@ -59,6 +59,7 @@ class OSGVIEWER_EXPORT Renderer : public osg::GraphicsOperation, public OpenGLQu
         Renderer(osg::Camera* camera);
 
         osgUtil::SceneView* getSceneView(unsigned int i) { return _sceneView[i].get(); }
+        const osgUtil::SceneView* getSceneView(unsigned int i) const { return _sceneView[i].get(); }
 
         void setDone(bool done) { _done = done; }
         bool getDone() { return _done; }
@@ -126,6 +127,10 @@ class OSGVIEWER_EXPORT Renderer : public osg::GraphicsOperation, public OpenGLQu
         void setConservativeTimeRatio(double ratio) { _conservativeTimeRatio = ratio; }
         double getConservativeTimeRatio() const { return _conservativeTimeRatio; }
 
+        /** Force update of state associated with cameras. */
+        void setCameraRequiresSetUp(bool flag);
+        bool getCameraRequiresSetUp() const;
+
     protected:
     
         virtual ~Renderer();

src/osg/FrameBufferObject.cpp

@@ -75,6 +75,7 @@ FBOExtensions::FBOExtensions(unsigned int contextID)
     LOAD_FBO_EXT(glFramebufferTextureLayer);
     LOAD_FBO_EXT(glFramebufferRenderbuffer);
     LOAD_FBO_EXT(glGenerateMipmap);
+    LOAD_FBO_EXT(glGetRenderbufferParameteriv);
 
     _supported = 
         glBindRenderbuffer != 0 &&
@@ -89,7 +90,8 @@ FBOExtensions::FBOExtensions(unsigned int contextID)
         glFramebufferTexture2D != 0 &&
         glFramebufferTexture3D != 0 &&
         glFramebufferRenderbuffer != 0 &&
-        glGenerateMipmap != 0;
+        glGenerateMipmap != 0 &&
+        glGetRenderbufferParameteriv != 0;
 
     LOAD_FBO_EXT(glBlitFramebuffer);
     LOAD_FBO_EXT(glRenderbufferStorageMultisample);

src/osgUtil/RenderStage.cpp

@@ -331,7 +331,7 @@ void RenderStage::runCameraSetUp(osg::RenderInfo& renderInfo)
         osg::FBOExtensions* fbo_ext = osg::FBOExtensions::instance(state.getContextID(),true);
         bool fbo_supported = fbo_ext && fbo_ext->isSupported();
         
-        if (fbo_supported && !_fbo)
+        if (fbo_supported)
         {
             OSG_NOTIFY(osg::INFO)<<"Setting up osg::Camera::FRAME_BUFFER_OBJECT"<<std::endl;
 

src/osgViewer/Renderer.cpp

@@ -743,3 +743,25 @@ void Renderer::release()
     _availableQueue.release();
     _drawQueue.release();
 }
+
+void Renderer::setCameraRequiresSetUp(bool flag)
+{
+    for (int i = 0; i < 2; ++i)
+    {
+        osgUtil::SceneView* sv = getSceneView(i);
+        osgUtil::RenderStage* rs = sv ? sv->getRenderStage() : 0;
+        if (rs) rs->setCameraRequiresSetUp(flag);
+    }
+}
+
+bool Renderer::getCameraRequiresSetUp() const
+{
+    bool result = false;
+    for (int i = 0; i < 2; ++i)
+    {
+        const osgUtil::SceneView* sv = getSceneView(i);
+        const osgUtil::RenderStage* rs = sv ? sv->getRenderStage() : 0;
+        if (rs) result = result || rs->getCameraRequiresSetUp();
+    }
+    return result;
+}