add ComputeDispatch class

revoke glDispatch in PCProgram::useProgram
update example

src/osg/CMakeLists.txt

@@ -55,6 +55,7 @@ SET(TARGET_H
     ${HEADER_PATH}/ColorMaski
     ${HEADER_PATH}/ColorMatrix
     ${HEADER_PATH}/ComputeBoundsVisitor
+    ${HEADER_PATH}/ComputeDispatch
     ${HEADER_PATH}/ContextData
     ${HEADER_PATH}/ConvexPlanarOccluder
     ${HEADER_PATH}/ConvexPlanarPolygon
@@ -267,6 +268,7 @@ SET(TARGET_SRC
     ColorMaski.cpp
     ColorMatrix.cpp
     ComputeBoundsVisitor.cpp
+    ComputeDispatch.cpp
     ContextData.cpp
     ConvexPlanarOccluder.cpp
     ConvexPlanarPolygon.cpp

src/osg/ComputeDispatch.cpp

@@ -0,0 +1,12 @@
+#include <osg/ComputeDispatch>
+using namespace osg;
+
+
+ComputeDispatch::ComputeDispatch(const ComputeDispatch&o,const osg::CopyOp& copyop): Drawable(o,copyop), _numGroupsX(o._numGroupsX), _numGroupsY(o._numGroupsY), _numGroupsZ(o._numGroupsZ)
+{
+
+}
+
+void ComputeDispatch::drawImplementation(RenderInfo& renderInfo) const{
+    renderInfo.getState()->get<GLExtensions>()->glDispatchCompute(_numGroupsX, _numGroupsY, _numGroupsZ);
+}

src/osg/Program.cpp

@@ -1108,8 +1108,4 @@ Program::ProgramBinary* Program::PerContextProgram::compileProgramBinary(osg::St
 void Program::PerContextProgram::useProgram() const
 {
     _extensions->glUseProgram( _glProgramHandle  );
-    if ( _program->_numGroupsX>0 && _program->_numGroupsY>0 && _program->_numGroupsZ>0 )
-    {
-        _extensions->glDispatchCompute( _program->_numGroupsX, _program->_numGroupsY, _program->_numGroupsZ );
-    }
 }

src/osgWrappers/serializers/osg/ComputeDispatch.cpp

@@ -0,0 +1,36 @@
+#include <osg/ComputeDispatch>
+#include <osgDB/ObjectWrapper>
+#include <osgDB/InputStream>
+#include <osgDB/OutputStream>
+
+// _numGroupsX/Y/Z
+static bool checkComputeGroups( const osg::ComputeDispatch& attr )
+{
+    GLint numX = 0, numY = 0, numZ = 0;
+    attr.getComputeGroups( numX, numY, numZ );
+    return numX>0 && numY>0 && numZ>0;
+}
+
+static bool readComputeGroups( osgDB::InputStream& is, osg::ComputeDispatch& attr )
+{
+    GLint numX = 0, numY = 0, numZ = 0;
+    is >> numX >> numY >> numZ;
+    attr.setComputeGroups( numX, numY, numZ );
+    return true;
+}
+
+static bool writeComputeGroups( osgDB::OutputStream& os, const osg::ComputeDispatch& attr )
+{
+    GLint numX = 0, numY = 0, numZ = 0;
+    attr.getComputeGroups( numX, numY, numZ );
+    os << numX << numY << numZ << std::endl;
+    return true;
+}
+
+REGISTER_OBJECT_WRAPPER( ComputeDispatch,
+                         new osg::ComputeDispatch,
+                         osg::ComputeDispatch,
+                         "osg::Object osg::Node osg::Drawable osg::ComputeDispatch" )
+{
+        ADD_USER_SERIALIZER( ComputeGroups );  // _numGroupsX/Y/Z
+}