From Marco Jez, added example that uses FBO extension to do prerendering.

2005-06-09 11:08:37 +00:00
parent 96eb0b71c6
commit 5c86ecebe4
12 changed files with 894 additions and 0 deletions
--- a/examples/osgfbo/FramebufferObject.cpp
+++ b/examples/osgfbo/FramebufferObject.cpp
@@ -0,0 +1,79 @@
+#include "FramebufferObject.h"
+#include "FBOExtensions.h"
+#include <osg/State>
+#include <osg/Notify>
+
+using namespace osg;
+
+FramebufferObject::FramebufferObject()
+:    StateAttribute()
+{
+}
+
+FramebufferObject::FramebufferObject(const FramebufferObject &copy, const CopyOp &copyop)
+:    StateAttribute(copy, copyop),
+    _attachments(copy._attachments)
+{
+}
+
+void FramebufferObject::apply(State &state) const
+{
+    unsigned int contextID = state.getContextID();
+
+    if (_unsupported[contextID])
+        return;
+
+    FBOExtensions* ext = FBOExtensions::instance(contextID);
+    if (!ext->isSupported())
+    {
+        _unsupported[contextID] = 1;
+        notify(WARN) << "Warning: EXT_framebuffer_object is not supported" << std::endl;
+        return;
+    }
+
+    if (_attachments.empty())
+    {
+        ext->glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+        return;
+    }
+
+    int &dirtyAttachmentList = _dirtyAttachmentList[contextID];
+
+    GLuint &fboID = _fboID[contextID];
+    if (fboID == 0)
+    {
+        ext->glGenFramebuffersEXT(1, &fboID);
+        if (fboID == 0)
+        {
+            notify(WARN) << "Warning: FramebufferObject: could not create the FBO" << std::endl;
+            return;
+        }
+        dirtyAttachmentList = 1;
+    }
+
+    ext->glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboID);
+
+    if (dirtyAttachmentList)
+    {
+        for (AttachmentMap::const_iterator i=_attachments.begin(); i!=_attachments.end(); ++i)
+        {
+            const FramebufferAttachment &fa = i->second;
+            fa.attach(state, i->first, ext);
+        }        
+        dirtyAttachmentList = 0;
+    }
+}
+
+int FramebufferObject::compare(const StateAttribute &sa) const
+{
+    COMPARE_StateAttribute_Types(FramebufferObject, sa);
+    COMPARE_StateAttribute_Parameter(_attachments.size());
+    AttachmentMap::const_iterator i = _attachments.begin();
+    AttachmentMap::const_iterator j = rhs._attachments.begin();
+    for (; i!=_attachments.end(); ++i, ++j)
+    {
+        int cmp = i->second.compare(j->second);
+        if (cmp != 0) return cmp;
+    }
+    return 0;
+}