Added osg::DrawMeshTasksIndirect class

examples/osgmeshshader/osgmeshshader.cpp

@@ -18,6 +18,7 @@
 #include <osg/Program>
 #include <osg/Shader>
 #include <osg/DrawMeshTasks>
+#include <osg/DrawMeshTasksIndirect>
 #include <osgUtil/Optimizer>
 
 int main( int argc, char** argv )
@@ -57,14 +58,18 @@ int main( int argc, char** argv )
     program->addShader( vShader.get() );
     program->addShader( fShader.get() );
 
-    osg::ref_ptr<osg::Node> drawMesh = new osg::DrawMeshTasks(0, 1);
+    osg::ref_ptr<osg::Group> group = new osg::Group;
-    drawMesh->getOrCreateStateSet()->setAttribute( program.get() );
+    group->getOrCreateStateSet()->setAttribute( program.get() );
 
-    osgDB::writeNodeFile(*drawMesh, "test.osgt");
+    group->addChild( new osg::DrawMeshTasks(0, 1) );
+
+    // group->addChild( new osg::DrawMeshTasksIndirect(0) ); // will require a buffer to be bound.
+
+    osgDB::writeNodeFile(*group, "test.osgt");
 
     osgViewer::Viewer viewer(arguments);
 
-    viewer.setSceneData( drawMesh );
+    viewer.setSceneData( group );
 
     // for non GL3/GL4 and non GLES2 platforms we need enable the osg_ uniforms that the shaders will use,
     // you don't need thse two lines on GL3/GL4 and GLES2 specific builds as these will be enable by default.

include/osg/DrawMeshTasks

@@ -11,12 +11,10 @@
  * OpenSceneGraph Public License for more details.
 */
 
-#ifndef OSG_DRAWPIXELS
+#ifndef OSG_DRAWMESHTASKS
-#define OSG_DRAWPIXELS 1
+#define OSG_DRAWMESHTASKS 1
 
 #include <osg/Drawable>
-#include <osg/Vec3>
-#include <osg/Image>
 
 namespace osg {
 

include/osg/DrawMeshTasksIndirect

@@ -0,0 +1,51 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * OpenSceneGraph Public License for more details.
+*/
+
+#ifndef OSG_DRAWMESHTASKSINDIRECT
+#define OSG_DRAWMESHTASKSINDIRECT 1
+
+#include <osg/Drawable>
+
+namespace osg {
+
+/** DrawMeshTasksIndirect is an osg::Drawable subclass which encapsulates glDrawMeshTasksIndirectNV.*/
+class OSG_EXPORT DrawMeshTasksIndirect : public Drawable
+{
+    public:
+
+        DrawMeshTasksIndirect();
+
+        DrawMeshTasksIndirect(GLintptr offset);
+
+        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
+        DrawMeshTasksIndirect(const DrawMeshTasksIndirect& drawimage,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
+
+        META_Node(osg, DrawMeshTasksIndirect);
+
+        void setOffset(GLintptr offset) { _offset = offset; }
+        GLintptr getOffset() const { return _offset; }
+
+        virtual void drawImplementation(RenderInfo& renderInfo) const;
+
+    protected:
+
+        DrawMeshTasksIndirect& operator = (const DrawMeshTasksIndirect&) { return *this;}
+
+        virtual ~DrawMeshTasksIndirect();
+
+        GLintptr _offset;
+};
+
+}
+
+#endif

src/osg/CMakeLists.txt

@@ -74,6 +74,7 @@ SET(TARGET_H
     ${HEADER_PATH}/DisplaySettings
     ${HEADER_PATH}/Drawable
     ${HEADER_PATH}/DrawMeshTasks
+    ${HEADER_PATH}/DrawMeshTasksIndirect
     ${HEADER_PATH}/DrawPixels
     ${HEADER_PATH}/Endian
     ${HEADER_PATH}/Export
@@ -291,6 +292,7 @@ SET(TARGET_SRC
     DisplaySettings.cpp
     Drawable.cpp
     DrawMeshTasks.cpp
+    DrawMeshTasksIndirect.cpp
     DrawPixels.cpp
     dxtctool.cpp
     dxtctool.h

src/osg/DrawMeshTasks.cpp

@@ -14,7 +14,9 @@
 
 using namespace osg;
 
-DrawMeshTasks::DrawMeshTasks()
+DrawMeshTasks::DrawMeshTasks():
+    _first(0),
+    _count(0)
 {
     // turn off display lists as they are inappropriate
     setSupportsDisplayList(false);

src/osg/DrawMeshTasksIndirect.cpp

@@ -0,0 +1,51 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * OpenSceneGraph Public License for more details.
+*/
+#include <osg/DrawMeshTasksIndirect>
+
+using namespace osg;
+
+DrawMeshTasksIndirect::DrawMeshTasksIndirect() :
+    _offset(0)
+{
+    // turn off display lists as they are inappropriate
+    setSupportsDisplayList(false);
+}
+
+DrawMeshTasksIndirect::DrawMeshTasksIndirect(GLintptr offset):
+    _offset(offset)
+{
+}
+
+DrawMeshTasksIndirect::DrawMeshTasksIndirect(const DrawMeshTasksIndirect& dmt,const CopyOp& copyop):
+    Drawable(dmt, copyop),
+    _offset(dmt._offset)
+{
+}
+
+DrawMeshTasksIndirect::~DrawMeshTasksIndirect()
+{
+}
+
+void DrawMeshTasksIndirect::drawImplementation(RenderInfo& renderInfo) const
+{
+    const GLExtensions* extensions = renderInfo.getState()->get<GLExtensions>();
+    if (extensions->isMeshShaderSupported && extensions->glDrawMeshTasksIndirectNV)
+    {
+        extensions->glDrawMeshTasksIndirectNV(_offset);
+    }
+    else
+    {
+        OSG_NOTICE<<"glDrawMeshTasksIndirectNV not supported. "<<std::endl;
+    }
+}
+

src/osgWrappers/serializers/osg/DrawMeshTasksIndirect.cpp

@@ -0,0 +1,13 @@
+#include <osg/DrawMeshTasksIndirect>
+#include <osgDB/ObjectWrapper>
+#include <osgDB/InputStream>
+#include <osgDB/OutputStream>
+
+REGISTER_OBJECT_WRAPPER( DrawMeshTasksIndirect,
+                         new osg::DrawMeshTasksIndirect,
+                         osg::DrawMeshTasksIndirect,
+                         "osg::Object osg::Node osg::Drawable osg::DrawMeshTasksIndirect" )
+{
+    wrapper->addSerializer( new osgDB::PropByValSerializer< MyClass, GLintptr >( \
+        "Offset", 0, &MyClass::getOffset, &MyClass::setOffset), osgDB::BaseSerializer::RW_INT );
+}