/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2014 Robert Osfield
 * Copyright (C) 2017 Julien Valentin
 *
 * 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_COMPUTEDISPATCH
#define OSG_COMPUTEDISPATCH 1

#include <osg/Export>

#include <osg/Geometry>

namespace osg{
    class OSG_EXPORT ComputeDispatch : public osg::Drawable
    {
        public:
            ComputeDispatch(GLint numGroupsX=0, GLint numGroupsY=0, GLint numGroupsZ=0):
                Drawable(),
                _numGroupsX(numGroupsX),
                _numGroupsY(numGroupsY),
                _numGroupsZ(numGroupsZ)
            {}

            ComputeDispatch(const ComputeDispatch&,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);

            META_Node(osg, ComputeDispatch);

            virtual void compileGLObjects(RenderInfo&) const {}

            virtual VertexArrayState* createVertexArrayStateImplememtation(RenderInfo&) const { return 0; }

            virtual void drawImplementation(RenderInfo& renderInfo) const;

            /** Set compute shader work groups */
            void setComputeGroups( GLint numGroupsX, GLint numGroupsY, GLint numGroupsZ ) { _numGroupsX=numGroupsX; _numGroupsY=numGroupsY; _numGroupsZ=numGroupsZ; }
            
            /** Get compute shader work groups */
            void getComputeGroups( GLint& numGroupsX, GLint& numGroupsY, GLint& numGroupsZ ) const{ numGroupsX=_numGroupsX; numGroupsY=_numGroupsY; numGroupsZ=_numGroupsZ; }

        protected:
            GLint _numGroupsX, _numGroupsY, _numGroupsZ;

    };
}
#endif