StencilTwoSided

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/* -*-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_STENCILTWOSIDED
#define OSG_STENCILTWOSIDED 1
 
#include <osg/Stencil>
 
namespace osg {
 
#ifndef GL_STENCIL_TEST_TWO_SIDE
#define GL_STENCIL_TEST_TWO_SIDE 0x8910
#endif

class OSG_EXPORT StencilTwoSided : public StateAttribute
{
    public :
 
 
        StencilTwoSided();

        StencilTwoSided(const StencilTwoSided& stencil,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
 
        META_StateAttribute(osg, StencilTwoSided, STENCIL);

        virtual int compare(const StateAttribute& sa) const;
 
        virtual bool getModeUsage(StateAttribute::ModeUsage& usage) const
        {
            usage.usesMode(GL_STENCIL_TEST);
            return true;
        }
 
        enum Face
        {
            FRONT = 0,
            BACK = 1
        };
 
        enum Function
        {
            NEVER = GL_NEVER,
            LESS = GL_LESS,
            EQUAL = GL_EQUAL,
            LEQUAL = GL_LEQUAL,
            GREATER = GL_GREATER,
            NOTEQUAL = GL_NOTEQUAL,
            GEQUAL = GL_GEQUAL,
            ALWAYS = GL_ALWAYS
        };
 
        inline void setFunction(Face face, Function func,int ref,unsigned int mask)
        {
            _func[face] = func;
            _funcRef[face] = ref;
            _funcMask[face] = mask;
        }
 
        inline void setFunction(Face face, Function func) { _func[face] = func; }
        inline Function getFunction(Face face) const { return _func[face]; }
 
        inline void setFunctionRef(Face face, int ref) { _funcRef[face]=ref; }
        inline int getFunctionRef(Face face) const { return _funcRef[face]; }
 
        inline void setFunctionMask(Face face, unsigned int mask) { _funcMask[face]=mask; }
        inline unsigned int getFunctionMask(Face face) const { return _funcMask[face]; }
 
 
        enum Operation
        {
            KEEP = GL_KEEP,
            ZERO = GL_ZERO,
            REPLACE = GL_REPLACE,
            INCR = GL_INCR,
            DECR = GL_DECR,
            INVERT = GL_INVERT,
            INCR_WRAP = GL_INCR_WRAP,
            DECR_WRAP = GL_DECR_WRAP
        };

        inline void setOperation(Face face, Operation sfail, Operation zfail, Operation zpass)
        {
            _sfail[face] = sfail;
            _zfail[face] = zfail;
            _zpass[face] = zpass;
        }

        inline void setStencilFailOperation(Face face, Operation sfail) { _sfail[face] = sfail; }

        inline Operation getStencilFailOperation(Face face) const { return _sfail[face]; }

        inline void setStencilPassAndDepthFailOperation(Face face, Operation zfail) { _zfail[face]=zfail; }

        inline Operation getStencilPassAndDepthFailOperation(Face face) const { return _zfail[face]; }

        inline void setStencilPassAndDepthPassOperation(Face face, Operation zpass) { _zpass[face]=zpass; }

        inline Operation getStencilPassAndDepthPassOperation(Face face) const { return _zpass[face]; }
 
 
        inline void setWriteMask(Face face, unsigned int mask) { _writeMask[face] = mask; }
 
        inline unsigned int getWriteMask(Face face) const { return _writeMask[face]; }
 
        
        virtual void apply(State& state) const;
 
    protected:
 
        virtual ~StencilTwoSided();
 
        Function            _func[2];
        int                 _funcRef[2];
        unsigned int        _funcMask[2];
 
        Operation           _sfail[2];
        Operation           _zfail[2];
        Operation           _zpass[2];
 
        unsigned int        _writeMask[2];
 
};
 
}
 
#endif