State

/* -*-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_STATE
#define OSG_STATE 1

#include <osg/Export>
#include <osg/StateSet>
#include <osg/Matrix>
#include <osg/Uniform>
#include <osg/BufferObject>
#include <osg/Observer>
#include <osg/Timer>

#include <osg/ShaderComposer>
#include <osg/FrameStamp>
#include <osg/DisplaySettings>
#include <osg/Polytope>
#include <osg/Viewport>
#include <osg/GLBeginEndAdapter>
#include <osg/ArrayDispatchers>
#include <osg/GraphicsCostEstimator>

#include <iosfwd>
#include <vector>
#include <map>
#include <set>
#include <string>

#ifndef GL_FOG_COORDINATE_ARRAY
    #ifdef GL_FOG_COORDINATE_ARRAY_EXT
        #define GL_FOG_COORDINATE_ARRAY GL_FOG_COORDINATE_ARRAY_EXT
    #else
        #define GL_FOG_COORDINATE_ARRAY 0x8457
    #endif
#endif

#ifndef GL_SECONDARY_COLOR_ARRAY
    #ifdef GL_SECONDARY_COLOR_ARRAY_EXT
        #define GL_SECONDARY_COLOR_ARRAY GL_SECONDARY_COLOR_ARRAY_EXT
    #else
        #define GL_SECONDARY_COLOR_ARRAY 0x845E
    #endif
#endif

#if !defined(GL_EXT_timer_query) && !defined(OSG_GL3_AVAILABLE)
    #ifdef _WIN32
        typedef          __int64 GLint64EXT;
        typedef unsigned __int64 GLuint64EXT;
    #else
        typedef long long int GLint64EXT;
        typedef unsigned long long int GLuint64EXT;
    #endif
#endif

namespace osg {

/** macro for use with osg::StateAttribute::apply methods for detecting and
  * reporting OpenGL error messages.*/
#define OSG_GL_DEBUG(message) \
    if (state.getFineGrainedErrorDetection()) \
    { \
        GLenum errorNo = glGetError(); \
        if (errorNo!=GL_NO_ERROR) \
        { \
            osg::notify(WARN)<<"Warning: detected OpenGL error '"<<gluErrorString(errorNo)<<" "<<message<<endl; \
        }\
    }


// forward declare GraphicsContext, View and State
class GraphicsContext;

class VertexAttribAlias
{
    public:
        VertexAttribAlias():
            _location(0) {}

        VertexAttribAlias(const VertexAttribAlias& rhs):
            _location(rhs._location),
            _glName(rhs._glName),
            _osgName(rhs._osgName),
            _declaration(rhs._declaration) {}

        VertexAttribAlias(GLuint location, const std::string glName, const std::string osgName, const std::string& declaration):
            _location(location),
            _glName(glName),
            _osgName(osgName),
            _declaration(declaration) {}

        GLuint      _location;
        std::string _glName;
        std::string _osgName;
        std::string _declaration;
};


/** Encapsulates the current applied OpenGL modes, attributes and vertex arrays settings,
  * implements lazy state updating and provides accessors for querying the current state.
  * The venerable Red Book says that "OpenGL is a state machine", and this class
  * represents the OpenGL state in OSG. Furthermore, \c State also has other
  * important features:
  * - It works as a stack of states (see \c pushStateSet() and
  *   \c popStateSet()). Manipulating this stack of OpenGL states manually is
  *   seldom needed, since OSG does this in the most common situations.
  * - It implements lazy state updating. This means that, if one requests a
  *   state change and that particular state is already in the requested state,
  *   no OpenGL call will be made. This ensures that the OpenGL pipeline is not
  *   stalled by unnecessary state changes.
  * - It allows to query the current OpenGL state without calls to \c glGet*(),
  *   which typically stall the graphics pipeline (see, for instance,
  *   \c captureCurrentState() and \c getModelViewMatrix()).
  */
class OSG_EXPORT State : public Referenced, public Observer
{
    public :

        State();


        /** Set the graphics context associated with that owns this State object.*/
        void setGraphicsContext(GraphicsContext* context) { _graphicsContext = context; }

        /** Get the graphics context associated with that owns this State object.*/
        GraphicsContext* getGraphicsContext() { return _graphicsContext; }

        /** Get the const graphics context associated with that owns this State object.*/
        const GraphicsContext* getGraphicsContext() const { return _graphicsContext; }


        /** Set the current OpenGL context uniqueID.
         *  The ContextID is used by classes like osg::StateAttribute's and osg::Drawable's to
         *  help manage seperate OpenGL objects, such as display lists, vertex buffer objects
         *  and texture object for each graphics context. The ContextID simply acts as an index 
         *  into arrays that these classes maintain for the purpose of storing GL object handles.
         * 
         *  Note, osgViewer::GraphicsWindow will automatically set up the ContextID for you,
         *  so you will rearely need to set this yourself.
         * 
         *  The exception is when creating your own graphics context, where you should set
         *  the ContextID uniquely for each graphics context.
         * 
         *  Typical settings for ContextID are 0,1,2,3... up to the maximum
         *  number of graphics contexts you have set up. By default contextID is 0.
         */
        inline void setContextID(unsigned int contextID) { _contextID=contextID; }

        /** Get the current OpenGL context unique ID.*/
        inline unsigned int getContextID() const { return _contextID; }


        /* Set whether shader composition is enabled.*/
        void setShaderCompositionEnabled(bool flag) { _shaderCompositionEnabled = flag; }

        /* Get whether shader composition is enabled.*/
        bool getShaderCompositionEnabled() const { return _shaderCompositionEnabled; }

        /** Set the ShaderComposor object that implements shader composition.*/
        void setShaderComposer(ShaderComposer* sc) { _shaderComposer = sc; }

        /** Get the ShaderComposor object.*/
        ShaderComposer* getShaderComposer() { return _shaderComposer.get(); }

        /** Get the const ShaderComposor object.*/
        const ShaderComposer* getShaderComposer() const { return _shaderComposer.get(); }

        /** Get the unform list in which to inject any uniforms that StateAttribute::apply(State&) methods provide.*/
        StateSet::UniformList& getCurrentShaderCompositionUniformList() { return _currentShaderCompositionUniformList; }

        /** Convinience method for StateAttribute:::apply(State&) methods to pass on their uniforms to osg::State so it can apply them at the appropriate point.*/
        void applyShaderCompositionUniform(const osg::Uniform* uniform, StateAttribute::OverrideValue value=StateAttribute::ON)
        {
            StateSet::RefUniformPair& up = _currentShaderCompositionUniformList[uniform->getName()];
            up.first = const_cast<Uniform*>(uniform);
            up.second = value;
        }


        /** Push stateset onto state stack.*/
        void pushStateSet(const StateSet* dstate);

        /** Pop stateset off state stack.*/
        void popStateSet();

        /** pop all statesets off state stack, ensuring it is empty ready for the next frame.
          * Note, to return OpenGL to default state, one should do any state.popAllStatSets(); state.apply().*/
        void popAllStateSets();

        /** Insert stateset onto state stack.*/
        void insertStateSet(unsigned int pos,const StateSet* dstate);

        /** Pop stateset off state stack.*/
        void removeStateSet(unsigned int pos);

        /** Get the number of StateSet's on the StateSet stack.*/
        unsigned int getStateSetStackSize() { return static_cast<unsigned int>(_stateStateStack.size()); }

        /** Pop StateSet's for the StateSet stack till its size equals the specified size.*/
        void popStateSetStackToSize(unsigned int size) { while (_stateStateStack.size()>size) popStateSet(); }

        typedef std::vector<const StateSet*> StateSetStack;

        /** Get the StateSet stack.*/
        StateSetStack& getStateSetStack() { return _stateStateStack; }


        /** Copy the modes and attributes which capture the current state.*/
        void captureCurrentState(StateSet& stateset) const;

        /** reset the state object to an empty stack.*/
        void reset();


        inline const Viewport* getCurrentViewport() const
        {
            return static_cast<const Viewport*>(getLastAppliedAttribute(osg::StateAttribute::VIEWPORT));
        }


        void setInitialViewMatrix(const osg::RefMatrix* matrix);

        inline const osg::Matrix& getInitialViewMatrix() const { return *_initialViewMatrix; }
        inline const osg::Matrix& getInitialInverseViewMatrix() const { return _initialInverseViewMatrix; }

        void applyProjectionMatrix(const osg::RefMatrix* matrix);

        inline const osg::Matrix& getProjectionMatrix() const { return *_projection; }

        void applyModelViewMatrix(const osg::RefMatrix* matrix);
        void applyModelViewMatrix(const osg::Matrix&);

        const osg::Matrix& getModelViewMatrix() const { return *_modelView; }

        void setUseModelViewAndProjectionUniforms(bool flag) { _useModelViewAndProjectionUniforms = flag; }
        bool getUseModelViewAndProjectionUniforms() const { return _useModelViewAndProjectionUniforms; }

        void updateModelViewAndProjectionMatrixUniforms();

        void applyModelViewAndProjectionUniformsIfRequired();

        osg::Uniform* getModelViewMatrixUniform() { return _modelViewMatrixUniform.get(); }
        osg::Uniform* getProjectionMatrixUniform() { return _projectionMatrixUniform.get(); }
        osg::Uniform* getModelViewProjectionMatrixUniform() { return _modelViewProjectionMatrixUniform.get(); }
        osg::Uniform* getNormalMatrixUniform() { return _normalMatrixUniform.get(); }


        Polytope getViewFrustum() const;


        void setUseVertexAttributeAliasing(bool flag) { _useVertexAttributeAliasing = flag; }
        bool getUseVertexAttributeAliasing() const { return _useVertexAttributeAliasing ; }

        typedef std::vector<VertexAttribAlias> VertexAttribAliasList;

        const VertexAttribAlias& getVertexAlias() { return _vertexAlias; }
        const VertexAttribAlias& getNormalAlias() { return _normalAlias; }
        const VertexAttribAlias& getColorAlias() { return _colorAlias; }
        const VertexAttribAlias& getSecondaryColorAlias() { return _secondaryColorAlias; }
        const VertexAttribAlias& getFogCoordAlias() { return _fogCoordAlias; }
        const VertexAttribAliasList& getTexCoordAliasList() { return _texCoordAliasList; }


        const Program::AttribBindingList&  getAttributeBindingList() { return _attributeBindingList; }

        bool convertVertexShaderSourceToOsgBuiltIns(std::string& source) const;


        /** Apply stateset.*/
        void apply(const StateSet* dstate);

        /** Updates the OpenGL state so that it matches the \c StateSet at the
          * top of the stack of <tt>StateSet</tt>s maintained internally by a
          * \c State.
         */
        void apply();

        /** Apply any shader composed state.*/
        void applyShaderComposition();

        /** Set whether a particular OpenGL mode is valid in the current graphics context.
          * Use to disable OpenGL modes that are not supported by current graphics drivers/context.*/
        inline void setModeValidity(StateAttribute::GLMode mode,bool valid)
        {
            ModeStack& ms = _modeMap[mode];
            ms.valid = valid;
        }

        /** Get whether a particular OpenGL mode is valid in the current graphics context.
          * Use to disable OpenGL modes that are not supported by current graphics drivers/context.*/
        inline bool getModeValidity(StateAttribute::GLMode mode)
        {
            ModeStack& ms = _modeMap[mode];
            return ms.valid;
        }

        inline void setGlobalDefaultModeValue(StateAttribute::GLMode mode,bool enabled)
        {
            ModeStack& ms = _modeMap[mode];
            ms.global_default_value = enabled;
        }

        inline bool getGlobalDefaultModeValue(StateAttribute::GLMode mode)
        {
            return _modeMap[mode].global_default_value;
        }


        /** Apply an OpenGL mode if required. This is a wrapper around
          * \c glEnable() and \c glDisable(), that just actually calls these
          * functions if the \c enabled flag is different than the current
          * state.
          * @return \c true if the state was actually changed. \c false
          *         otherwise. Notice that a \c false return does not indicate
          *         an error, it just means that the mode was already set to the
          *         same value as the \c enabled parameter.
        */
        inline bool applyMode(StateAttribute::GLMode mode,bool enabled)
        {
            ModeStack& ms = _modeMap[mode];
            ms.changed = true;
            return applyMode(mode,enabled,ms);
        }

        inline void setGlobalDefaultTextureModeValue(unsigned int unit, StateAttribute::GLMode mode,bool enabled)
        {
            ModeMap& modeMap = getOrCreateTextureModeMap(unit);
            ModeStack& ms = modeMap[mode];
            ms.global_default_value = enabled;
        }

        inline bool getGlobalDefaultTextureModeValue(unsigned int unit, StateAttribute::GLMode mode)
        {
            ModeMap& modeMap = getOrCreateTextureModeMap(unit);
            ModeStack& ms = modeMap[mode];
            return ms.global_default_value;
        }

        inline bool applyTextureMode(unsigned int unit, StateAttribute::GLMode mode,bool enabled)
        {
            ModeMap& modeMap = getOrCreateTextureModeMap(unit);
            ModeStack& ms = modeMap[mode];
            ms.changed = true;
            return applyModeOnTexUnit(unit,mode,enabled,ms);
        }

        inline void setGlobalDefaultAttribute(const StateAttribute* attribute)
        {
            AttributeStack& as = _attributeMap[attribute->getTypeMemberPair()];
            as.global_default_attribute = attribute;
        }

        inline const StateAttribute* getGlobalDefaultAttribute(StateAttribute::Type type, unsigned int member=0)
        {
            AttributeStack& as = _attributeMap[StateAttribute::TypeMemberPair(type,member)];
            return as.global_default_attribute.get();
        }

        /** Apply an attribute if required. */
        inline bool applyAttribute(const StateAttribute* attribute)
        {
            AttributeStack& as = _attributeMap[attribute->getTypeMemberPair()];
            as.changed = true;
            return applyAttribute(attribute,as);
        }

        inline void setGlobalDefaultTextureAttribute(unsigned int unit, const StateAttribute* attribute)
        {
            AttributeMap& attributeMap = getOrCreateTextureAttributeMap(unit);
            AttributeStack& as = attributeMap[attribute->getTypeMemberPair()];
            as.global_default_attribute = attribute;
        }

        inline const StateAttribute* getGlobalDefaultTextureAttribute(unsigned int unit, StateAttribute::Type type, unsigned int member = 0)
        {
            AttributeMap& attributeMap = getOrCreateTextureAttributeMap(unit);
            AttributeStack& as = attributeMap[StateAttribute::TypeMemberPair(type,member)];
            return as.global_default_attribute.get();
        }


        inline bool applyTextureAttribute(unsigned int unit, const StateAttribute* attribute)
        {
            AttributeMap& attributeMap = getOrCreateTextureAttributeMap(unit);
            AttributeStack& as = attributeMap[attribute->getTypeMemberPair()];
            as.changed = true;
            return applyAttributeOnTexUnit(unit,attribute,as);
        }

        /** Mode has been set externally, update state to reflect this setting.*/
        void haveAppliedMode(StateAttribute::GLMode mode,StateAttribute::GLModeValue value);

        /** Mode has been set externally, therefore dirty the associated mode in osg::State
          * so it is applied on next call to osg::State::apply(..)*/
        void haveAppliedMode(StateAttribute::GLMode mode);

        /** Attribute has been applied externally, update state to reflect this setting.*/
        void haveAppliedAttribute(const StateAttribute* attribute);

        /** Attribute has been applied externally, 
          * and therefore this attribute type has been dirtied 
          * and will need to be re-applied on next osg::State.apply(..).
          * note, if you have an osg::StateAttribute which you have applied externally
          * then use the have_applied(attribute) method as this will cause the osg::State to
          * track the current state more accurately and enable lazy state updating such
          * that only changed state will be applied.*/
        void haveAppliedAttribute(StateAttribute::Type type, unsigned int member=0);

        /** Get whether the current specified mode is enabled (true) or disabled (false).*/
        bool getLastAppliedMode(StateAttribute::GLMode mode) const;

        /** Get the current specified attribute, return NULL if one has not yet been applied.*/
        const StateAttribute* getLastAppliedAttribute(StateAttribute::Type type, unsigned int member=0) const;

        /** texture Mode has been set externally, update state to reflect this setting.*/
        void haveAppliedTextureMode(unsigned int unit, StateAttribute::GLMode mode,StateAttribute::GLModeValue value);

        /** texture Mode has been set externally, therefore dirty the associated mode in osg::State
          * so it is applied on next call to osg::State::apply(..)*/
        void haveAppliedTextureMode(unsigned int unit, StateAttribute::GLMode mode);

        /** texture Attribute has been applied externally, update state to reflect this setting.*/
        void haveAppliedTextureAttribute(unsigned int unit, const StateAttribute* attribute);

        /** texture Attribute has been applied externally,
          * and therefore this attribute type has been dirtied
          * and will need to be re-applied on next osg::State.apply(..).
          * note, if you have an osg::StateAttribute which you have applied externally
          * then use the have_applied(attribute) method as this will the osg::State to
          * track the current state more accurately and enable lazy state updating such
          * that only changed state will be applied.*/
        void haveAppliedTextureAttribute(unsigned int unit, StateAttribute::Type type, unsigned int member=0);

        /** Get whether the current specified texture mode is enabled (true) or disabled (false).*/
        bool getLastAppliedTextureMode(unsigned int unit, StateAttribute::GLMode mode) const;

        /** Get the current specified texture attribute, return NULL if one has not yet been applied.*/
        const StateAttribute* getLastAppliedTextureAttribute(unsigned int unit, StateAttribute::Type type, unsigned int member=0) const;


        /** Dirty the modes previously applied in osg::State.*/
        void dirtyAllModes();

        /** Dirty the modes attributes previously applied in osg::State.*/
        void dirtyAllAttributes();

        /** disable the vertex, normal, color, tex coords, secondary color, fog coord and index arrays.*/
        void disableAllVertexArrays();

        /** dirty the vertex, normal, color, tex coords, secondary color, fog coord and index arrays.*/
        void dirtyAllVertexArrays();


        void setCurrentVertexBufferObject(osg::GLBufferObject* vbo) { _currentVBO = vbo; }
        const GLBufferObject* getCurrentVertexBufferObject() { return _currentVBO; }
        inline void bindVertexBufferObject(osg::GLBufferObject* vbo)
        {
            if (vbo == _currentVBO) return;
            if (vbo->isDirty()) vbo->compileBuffer();
            else vbo->bindBuffer();
            _currentVBO = vbo;
        }

        inline void unbindVertexBufferObject()
        {
            if (!_currentVBO) return;
            _glBindBuffer(GL_ARRAY_BUFFER_ARB,0);
            _currentVBO = 0;
        }

        void setCurrentElementBufferObject(osg::GLBufferObject* ebo) { _currentEBO = ebo; }
        const GLBufferObject* getCurrentElementBufferObject() { return _currentEBO; }

        inline void bindElementBufferObject(osg::GLBufferObject* ebo)
        {
            if (ebo == _currentEBO) return;
            if (ebo->isDirty()) ebo->compileBuffer();
            else ebo->bindBuffer();
            _currentEBO = ebo;
        }

        inline void unbindElementBufferObject()
        {
            if (!_currentEBO) return;
            _glBindBuffer(GL_ELEMENT_ARRAY_BUFFER_ARB,0);
            _currentEBO = 0;
        }

        void setCurrentPixelBufferObject(osg::GLBufferObject* pbo) { _currentPBO = pbo; }
        const GLBufferObject* getCurrentPixelBufferObject() { return _currentPBO; }

        inline void bindPixelBufferObject(osg::GLBufferObject* pbo)
        {
            if (pbo == _currentPBO) return;

            if (pbo->isDirty()) pbo->compileBuffer();
            else pbo->bindBuffer();

            _currentPBO = pbo;
        }

        inline void unbindPixelBufferObject()
        {
            if (!_currentPBO) return;

            _glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB,0);
            _currentPBO = 0;
        }

        typedef std::vector<GLushort> IndicesGLushort;
        IndicesGLushort _quadIndicesGLushort[4];

        typedef std::vector<GLuint> IndicesGLuint;
        IndicesGLuint _quadIndicesGLuint[4];

        void drawQuads(GLint first, GLsizei count, GLsizei primCount=0);

        inline void glDrawArraysInstanced(GLenum mode, GLint first, GLsizei count, GLsizei primcount)
        {
            if (primcount>=1 && _glDrawArraysInstanced!=0) _glDrawArraysInstanced(mode, first, count, primcount);
            else glDrawArrays(mode, first, count);
        }

        inline void glDrawElementsInstanced(GLenum mode, GLsizei count, GLenum type, const GLvoid *indices, GLsizei primcount )
        {
            if (primcount>=1 && _glDrawElementsInstanced!=0) _glDrawElementsInstanced(mode, count, type, indices, primcount);
            else glDrawElements(mode, count, type, indices);
        }


        inline void Vertex(float x, float y, float z, float w=1.0f)
        {
        #if defined(OSG_GL_VERTEX_FUNCS_AVAILABLE) && !defined(OSG_GLES1_AVAILABLE)
            if (_useVertexAttributeAliasing) _glVertexAttrib4f( _vertexAlias._location, x,y,z,w);
            else glVertex4f(x,y,z,w);
        #else
            _glVertexAttrib4f( _vertexAlias._location, x,y,z,w);
        #endif
        }

        inline void Color(float r, float g, float b, float a=1.0f)
        {
        #ifdef OSG_GL_VERTEX_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing) _glVertexAttrib4f( _colorAlias._location, r,g,b,a);
            else glColor4f(r,g,b,a);
        #else
            _glVertexAttrib4f( _colorAlias._location, r,g,b,a);
        #endif
        }

        void Normal(float x, float y, float z)
        {
        #ifdef OSG_GL_VERTEX_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing) _glVertexAttrib4f( _normalAlias._location, x,y,z,0.0);
            else glNormal3f(x,y,z);
        #else
            _glVertexAttrib4f( _normalAlias._location, x,y,z,0.0);
        #endif
        }

        void TexCoord(float x, float y=0.0f, float z=0.0f, float w=1.0f)
        {
        #if !defined(OSG_GLES1_AVAILABLE)
            #ifdef OSG_GL_VERTEX_FUNCS_AVAILABLE
                if (_useVertexAttributeAliasing) _glVertexAttrib4f( _texCoordAliasList[0]._location, x,y,z,w);
                else glTexCoord4f(x,y,z,w);
            #else
                _glVertexAttrib4f( _texCoordAliasList[0]._location, x,y,z,w);
            #endif
        #endif
        }

        void MultiTexCoord(unsigned int unit, float x, float y=0.0f, float z=0.0f, float w=1.0f)
        {
        #if !defined(OSG_GLES1_AVAILABLE)
            #ifdef OSG_GL_VERTEX_FUNCS_AVAILABLE
                if (_useVertexAttributeAliasing) _glVertexAttrib4f( _texCoordAliasList[unit]._location, x,y,z,w);
                else _glMultiTexCoord4f(GL_TEXTURE0+unit,x,y,z,w);
            #else
                _glVertexAttrib4f( _texCoordAliasList[unit]._location, x,y,z,w);
            #endif
        #endif
        }

        void VerteAttrib(unsigned int location, float x, float y=0.0f, float z=0.0f, float w=0.0f)
        {
            _glVertexAttrib4f( location, x,y,z,w);
        }


        /** Mark all the vertex attributes as being disabled but leave the disabling till a later call to applyDisablingOfVertexAttributes.*/
        void lazyDisablingOfVertexAttributes();

        /** Disable all the vertex attributes that have been marked as to be disabled.*/
        void applyDisablingOfVertexAttributes();

        /** Wrapper around glInterleavedArrays(..).
          * also resets the internal array points and modes within osg::State to keep the other
          * vertex array operations consistent. */
        void setInterleavedArrays( GLenum format, GLsizei stride, const GLvoid* pointer);

        /** Set the vertex pointer using an osg::Array, and manage any VBO that are required.*/
        inline void setVertexPointer(const Array* array)
        {
            if (array)
            {
                GLBufferObject* vbo = array->getOrCreateGLBufferObject(_contextID);
                if (vbo)
                {
                    bindVertexBufferObject(vbo);
                    setVertexPointer(array->getDataSize(),array->getDataType(),0,(const GLvoid *)(vbo->getOffset(array->getBufferIndex())));
                }
                else
                {
                    unbindVertexBufferObject();
                    setVertexPointer(array->getDataSize(),array->getDataType(),0,array->getDataPointer());
                }
            }
        }

        /** wrapper around glEnableClientState(GL_VERTEX_ARRAY);glVertexPointer(..);
          * note, only updates values that change.*/
        inline void setVertexPointer( GLint size, GLenum type,
                                      GLsizei stride, const GLvoid *ptr )
        {
        #ifdef OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing)
            {
                setVertexAttribPointer(_vertexAlias._location, size, type, GL_FALSE, stride, ptr);
            }
            else
            {
                if (!_vertexArray._enabled || _vertexArray._dirty)
                {
                    _vertexArray._enabled = true;
                    glEnableClientState(GL_VERTEX_ARRAY);
                }
                //if (_vertexArray._pointer!=ptr || _vertexArray._dirty)
                {
                    _vertexArray._pointer=ptr;
                    glVertexPointer( size, type, stride, ptr );
                }
                _vertexArray._lazy_disable = false;
                _vertexArray._dirty = false;
            }
        #else
            setVertexAttribPointer(_vertexAlias._location, size, type, GL_FALSE, stride, ptr);
        #endif
        }

        /** wrapper around glDisableClientState(GL_VERTEX_ARRAY).
          * note, only updates values that change.*/
        inline void disableVertexPointer()
        {
        #ifdef OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing)
            {
                disableVertexAttribPointer(_vertexAlias._location);
            }
            else
            {
                if (_vertexArray._enabled || _vertexArray._dirty)
                {
                    _vertexArray._lazy_disable = false;
                    _vertexArray._enabled = false;
                    _vertexArray._dirty = false;
                    glDisableClientState(GL_VERTEX_ARRAY);
                }
            }
        #else
            disableVertexAttribPointer(_vertexAlias._location);
        #endif
        }

        inline void dirtyVertexPointer()
        {
        #ifdef OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing)
            {
                dirtyVertexAttribPointer(_vertexAlias._location);
            }
            else
            {
                _vertexArray._pointer = 0;
                _vertexArray._dirty = true;
            }
        #else
            dirtyVertexAttribPointer(_vertexAlias._location);
        #endif
        }


        /** Set the normal pointer using an osg::Array, and manage any VBO that are required.*/
        inline void setNormalPointer(const Array* array)
        {
            if (array)
            {
                GLBufferObject* vbo = array->getOrCreateGLBufferObject(_contextID);
                if (vbo)
                {
                    bindVertexBufferObject(vbo);
                    setNormalPointer(array->getDataType(),0,(const GLvoid *)(vbo->getOffset(array->getBufferIndex())));
                }
                else
                {
                    unbindVertexBufferObject();
                    setNormalPointer(array->getDataType(),0,array->getDataPointer());
                }
            }
        }

        /** wrapper around glEnableClientState(GL_NORMAL_ARRAY);glNormalPointer(..);
          * note, only updates values that change.*/
        inline void setNormalPointer( GLenum type, GLsizei stride,
                                      const GLvoid *ptr )
        {
        #ifdef OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing)
            {
                setVertexAttribPointer(_normalAlias._location, 3, type, GL_FALSE, stride, ptr);
            }
            else
            {
                if (!_normalArray._enabled || _normalArray._dirty)
                {
                    _normalArray._enabled = true;
                    glEnableClientState(GL_NORMAL_ARRAY);
                }
                //if (_normalArray._pointer!=ptr || _normalArray._dirty)
                {
                    _normalArray._pointer=ptr;
                    glNormalPointer( type, stride, ptr );
                }
                _normalArray._lazy_disable = false;
                _normalArray._dirty = false;
            }
        #else
            setVertexAttribPointer(_normalAlias._location, 3, type, GL_FALSE, stride, ptr);
        #endif
        }

        /** wrapper around glDisableClientState(GL_NORMAL_ARRAY);
          * note, only updates values that change.*/
        inline void disableNormalPointer()
        {
        #ifdef OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing)
            {
                disableVertexAttribPointer(_normalAlias._location);
            }
            else
            {
                if (_normalArray._enabled || _normalArray._dirty)
                {
                    _normalArray._lazy_disable = false;
                    _normalArray._enabled = false;
                    _normalArray._dirty = false;
                    glDisableClientState(GL_NORMAL_ARRAY);
                }
            }
        #else
            disableVertexAttribPointer(_normalAlias._location);
        #endif
        }

        inline void dirtyNormalPointer()
        {
        #ifdef OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing)
            {
                dirtyVertexAttribPointer(_normalAlias._location);
            }
            else
            {
                _normalArray._pointer = 0;
                _normalArray._dirty = true;
            }
        #else
            dirtyVertexAttribPointer(_normalAlias._location);
        #endif
        }

        /** Set the color pointer using an osg::Array, and manage any VBO that are required.*/
        inline void setColorPointer(const Array* array)
        {
            if (array)
            {
                GLBufferObject* vbo = array->getOrCreateGLBufferObject(_contextID);
                if (vbo)
                {
                    bindVertexBufferObject(vbo);
                    setColorPointer(array->getDataSize(),array->getDataType(),0,(const GLvoid *)(vbo->getOffset(array->getBufferIndex())));
                }
                else
                {
                    unbindVertexBufferObject();
                    setColorPointer(array->getDataSize(),array->getDataType(),0,array->getDataPointer());
                }
            }
        }


        /** wrapper around glEnableClientState(GL_COLOR_ARRAY);glColorPointer(..);
          * note, only updates values that change.*/
        inline void setColorPointer( GLint size, GLenum type,
                                     GLsizei stride, const GLvoid *ptr )
        {
        #ifdef OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing)
            {
                setVertexAttribPointer(_colorAlias._location, size, type, GL_FALSE, stride, ptr);
            }
            else
            {
                if (!_colorArray._enabled || _colorArray._dirty)
                {
                    _colorArray._enabled = true;
                    glEnableClientState(GL_COLOR_ARRAY);
                }
                //if (_colorArray._pointer!=ptr || _colorArray._dirty)
                {
                    _colorArray._pointer=ptr;
                    glColorPointer( size, type, stride, ptr );
                }
                _colorArray._lazy_disable = false;
                _colorArray._dirty = false;
            }
        #else
            setVertexAttribPointer(_colorAlias._location, size, type, GL_FALSE, stride, ptr);
        #endif
        }

        /** wrapper around glDisableClientState(GL_COLOR_ARRAY);
          * note, only updates values that change.*/
        inline void disableColorPointer()
        {
        #ifdef OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing)
            {
                disableVertexAttribPointer(_colorAlias._location);
            }
            else
            {
                if (_colorArray._enabled || _colorArray._dirty)
                {
                    _colorArray._lazy_disable = false;
                    _colorArray._enabled = false;
                    _colorArray._dirty = false;
                    glDisableClientState(GL_COLOR_ARRAY);
                }
            }
        #else
            disableVertexAttribPointer(_colorAlias._location);
        #endif
        }

        inline void dirtyColorPointer()
        {
        #ifdef OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing)
            {
                dirtyVertexAttribPointer(_colorAlias._location);
            }
            else
            {
                _colorArray._pointer = 0;
                _colorArray._dirty = true;
            }
        #else
            dirtyVertexAttribPointer(_colorAlias._location);
        #endif
        }


        inline bool isSecondaryColorSupported() const { return _isSecondaryColorSupportResolved?_isSecondaryColorSupported:computeSecondaryColorSupported(); }


        /** Set the secondary color pointer using an osg::Array, and manage any VBO that are required.*/
        inline void setSecondaryColorPointer(const Array* array)
        {
            if (array)
            {
                GLBufferObject* vbo = array->getOrCreateGLBufferObject(_contextID);
                if (vbo)
                {
                    bindVertexBufferObject(vbo);
                    setSecondaryColorPointer(array->getDataSize(),array->getDataType(),0,(const GLvoid *)(vbo->getOffset(array->getBufferIndex())));
                }
                else
                {
                    unbindVertexBufferObject();
                    setSecondaryColorPointer(array->getDataSize(),array->getDataType(),0,array->getDataPointer());
                }
            }
        }

        /** wrapper around glEnableClientState(GL_SECONDARY_COLOR_ARRAY);glSecondayColorPointer(..);
          * note, only updates values that change.*/
        void setSecondaryColorPointer( GLint size, GLenum type, GLsizei stride, const GLvoid *ptr );

        /** wrapper around glDisableClientState(GL_SECONDARY_COLOR_ARRAY);
          * note, only updates values that change.*/
        inline void disableSecondaryColorPointer()
        {
        #ifdef OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing)
            {
                disableVertexAttribPointer(_secondaryColorAlias._location);
            }
            else
            {
                if (_secondaryColorArray._enabled || _secondaryColorArray._dirty)
                {
                    _secondaryColorArray._lazy_disable = false;
                    _secondaryColorArray._enabled = false;
                    _secondaryColorArray._dirty = false;
                    if (isSecondaryColorSupported()) glDisableClientState(GL_SECONDARY_COLOR_ARRAY);
                }
            }
        #else
            disableVertexAttribPointer(_secondaryColorAlias._location);
        #endif
        }

        inline void dirtySecondaryColorPointer()
        {
        #ifdef OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing)
            {
                dirtyVertexAttribPointer(_secondaryColorAlias._location);
            }
            else
            {
                _secondaryColorArray._pointer = 0;
                _secondaryColorArray._dirty = true;
            }
        #else
            dirtyVertexAttribPointer(_secondaryColorAlias._location);
        #endif
        }

        inline bool isFogCoordSupported() const { return _isFogCoordSupportResolved?_isFogCoordSupported:computeFogCoordSupported(); }


        /** Set the fog coord pointer using an osg::Array, and manage any VBO that are required.*/
        inline void setFogCoordPointer(const Array* array)
        {
            if (array)
            {
                GLBufferObject* vbo = array->getOrCreateGLBufferObject(_contextID);
                if (vbo)
                {
                    bindVertexBufferObject(vbo);
                    setFogCoordPointer(array->getDataType(),0,(const GLvoid *)(vbo->getOffset(array->getBufferIndex())));
                }
                else
                {
                    unbindVertexBufferObject();
                    setFogCoordPointer(array->getDataType(),0,array->getDataPointer());
                }
            }
        }


        /** wrapper around glEnableClientState(GL_FOG_COORDINATE_ARRAY);glFogCoordPointer(..);
          * note, only updates values that change.*/
        void setFogCoordPointer( GLenum type, GLsizei stride, const GLvoid *ptr );

        /** wrapper around glDisableClientState(GL_FOG_COORDINATE_ARRAY);
          * note, only updates values that change.*/
        inline void disableFogCoordPointer()
        {
        #ifdef OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
            if (_useVertexAttributeAliasing)
            {
                disableVertexAttribPointer(_fogCoordAlias._location);
            }
            else
            {
                if (_fogArray._enabled || _fogArray._dirty)
                {
                    _fogArray._lazy_disable = false;
                    _fogArray._enabled = false;
                    _fogArray._dirty = false;
                    if (isFogCoordSupported()) glDisableClientState(GL_FOG_COORDINATE_ARRAY);
                }
            }
        #else
            disableVertexAttribPointer(_fogCoordAlias._location);
        #endif