add example for testing

examples/CMakeLists.txt

@@ -88,6 +88,7 @@ IF(DYNAMIC_OPENSCENEGRAPH)
     ADD_SUBDIRECTORY(osgparticle)
     ADD_SUBDIRECTORY(osgparticleeffects)
     ADD_SUBDIRECTORY(osgparticleshader)
+    ADD_SUBDIRECTORY(osgpersistentbufferstorage)
     ADD_SUBDIRECTORY(osgpick)
     ADD_SUBDIRECTORY(osgplanets)
     ADD_SUBDIRECTORY(osgpoints)

examples/osgpersistentbufferstorage/CMakeLists.txt

@@ -0,0 +1,7 @@
+#this file is automatically generated
+
+
+SET(TARGET_SRC osgpersistentbufferstorage.cpp )
+
+#### end var setup  ###
+SETUP_EXAMPLE(osgpersistentbufferstorage)

examples/osgpersistentbufferstorage/osgpersistentbufferstorage.cpp

@@ -0,0 +1,134 @@
+/* OpenSceneGraph example, osgpersistentbufferstorage
+*
+*  Permission is hereby granted, free of charge, to any person obtaining a copy
+*  of this software and associated documentation files (the "Software"), to deal
+*  in the Software without restriction, including without limitation the rights
+*  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+*  copies of the Software, and to permit persons to whom the Software is
+*  furnished to do so, subject to the following conditions:
+*
+*  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+*  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+*  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+*  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+*  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+*  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+*  THE SOFTWARE.
+*/
+
+/* file:        examples/osgpersistentbufferstorage/osgpersistentbufferstorage.cpp
+* author:      Julien Valentin 2020-10-01
+* copyright:   (C) 2013
+* license:     OpenSceneGraph Public License (OSGPL)
+*
+* A test of BufferStorage and PersistantBufferStorage features
+*
+*/
+
+
+#include <osg/GL2Extensions>
+#include <osg/Notify>
+#include <osg/ref_ptr>
+#include <osg/Geode>
+#include <osg/Geometry>
+#include <osg/Point>
+#include <osg/Vec3>
+#include <osg/Vec4>
+#include <osg/Program>
+#include <osg/Shader>
+#include <osg/BlendFunc>
+
+#include <osg/Uniform>
+#include <osgViewer/Viewer>
+
+#include <osg/BufferIndexBinding>
+
+#include <iostream>
+
+///////////////////////////////////////////////////////////////////////////
+
+class SineAnimation: public osg::Camera::DrawCallback
+{
+public:
+    SineAnimation(osg::Vec4Array* dyn, float scale = 1.0f, float offset = 0.0f ) :
+        _dyn(dyn),_rate(0), _scale(scale), _offset(offset)
+    {}
+
+    void operator()(osg::RenderInfo& renderInfo) const
+    {
+        unsigned int contextId =  renderInfo.getContextID();
+        osg::GLBufferObject * glbo = _dyn->getBufferObject()->getOrCreateGLBufferObject(contextId);
+        glbo->bindBuffer();
+        GLfloat * data=(GLfloat*)glbo->_persistentDMA+glbo->getOffset(_dyn->getBufferIndex());
+        if(data)
+        {
+            _rate+=0.01;
+            float angle = _rate ;
+            float value =  sinf( angle ) * _scale + _offset;
+            for(int i=0; i<4; i++) {
+                data[i*4+0]=float(i)*0.25*value;
+            }
+            glbo->commitDMA(_dyn->getBufferIndex());
+        }
+    }
+
+private:
+    osg::ref_ptr<osg::Vec4Array> _dyn;
+    mutable float _rate;
+    const float _scale;
+    const float _offset;
+};
+
+
+///////////////////////////////////////////////////////////////////////////
+
+int main( int, char** )
+{
+    osg::Camera* root=new osg::Camera;
+    /// a first geom to demonstrate how to use usage to enable immutable buffer storage
+    {
+        osg::Vec4Array* vAry = new osg::Vec4Array;
+        vAry->push_back( osg::Vec4(2,0,0,1) );
+        vAry->push_back( osg::Vec4(2,1,0,1) );
+        vAry->push_back( osg::Vec4(3,0,0,1) );
+        vAry->push_back( osg::Vec4(3,1,0,1 ));
+        osg::VertexBufferObject*vbo = new osg::VertexBufferObject;
+        vbo->setUsage(GL_MAP_WRITE_BIT);//enable bufferStorage
+        vbo->setMappingBitfield(GL_MAP_WRITE_BIT);//set mapping flags
+        vAry->setBufferObject(vbo);
+        osg::Geometry * geom=new osg::Geometry;
+        geom->setUseDisplayList(false);
+        geom->setUseVertexBufferObjects(true);
+        geom->setVertexArray( vAry );
+        geom->addPrimitiveSet( new osg::DrawArrays( GL_LINES, 0, vAry->size() ) );
+        root->addChild(geom);
+    }
+
+    //second geometry buffer is persistent mapped and modified in camera callback
+    {
+        osg::Vec4Array* vAry = new osg::Vec4Array;
+        vAry->setDataVariance(osg::Object::STATIC);
+        vAry->push_back( osg::Vec4(0,0,0,1) );
+        vAry->push_back( osg::Vec4(0,1,0,1) );
+        vAry->push_back( osg::Vec4(1,0,0,1) );
+        vAry->push_back( osg::Vec4(1,1,0,1 ));
+        osg::VertexBufferObject*vbo = new osg::VertexBufferObject;
+        vbo->setDataVariance(osg::Object::STATIC);
+        vbo->setUsage(GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT );//enable persistant bufferStorage
+        vbo->setMappingBitfield(GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT| GL_MAP_FLUSH_EXPLICIT_BIT );//set mapping flags
+
+        vAry->setBufferObject(vbo);
+        osg::Geometry * geom=new osg::Geometry;
+
+        geom->setUseDisplayList(false);
+        geom->setUseVertexBufferObjects(true);
+        geom->setVertexArray( vAry );
+        geom->addPrimitiveSet( new osg::DrawArrays( GL_QUADS, 0, vAry->size() ) );
+        root->addChild(geom);
+
+        root->addPostDrawCallback(new SineAnimation(vAry));
+    }
+    osgViewer::Viewer viewer;
+    viewer.setSceneData( root );
+    return viewer.run();
+}