SoShape.h

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/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  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 GNU
 *  Lesser General Public License for more details.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */
 
 
/*
 * Copyright (C) 1990,91   Silicon Graphics, Inc.
 *
 _______________________________________________________________________
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 |
 |   $Revision: 1.1.1.1 $
 |
 |   Description:
 |      This file defines the SoShape node class.
 |
 |   Author(s)          : Paul S. Strauss
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */
 
#ifndef  _SO_SHAPE_
#define  _SO_SHAPE_
 
#include <Inventor/SbLinear.h>
#include <Inventor/nodes/SoSubNode.h>
 
#include <Inventor/system/SbOpenGLU.h>
#include <Inventor/misc/SoVBO.h>
 
class SoCube;
class SoDetail;
class SoFaceDetail;
class SoMaterialBundle;
class SoPickedPoint;
class SoPointDetail;
class SoPrimitiveVertex;
class SoState;
 

#ifndef gluTESSELATOR
#if (defined(__glu_h__) || defined(GLU_H)) && defined(GLU_VERSION_1_2)
#define gluTESSELATOR  GLUtesselator
#else
#define gluTESSELATOR  GLUtriangulatorObj
extern "C" struct GLUtriangulatorObj;
#endif
#endif
 
 


 
class INVENTOR_API SoShape : public SoNode {
 
    SO_NODE_ABSTRACT_HEADER(SoShape);
 
  public:
    virtual bool        affectsState() const;
 
  SoINTERNAL public:
    static void         initClass();

    enum TriangleShape {
        TRIANGLE_STRIP,
        TRIANGLE_FAN,
        TRIANGLES,
        POLYGON
    };
 
  SoEXTENDER public:
    virtual void        getBoundingBox(SoGetBoundingBoxAction *action);

    virtual void        GLRender(SoGLRenderAction *action);

    virtual void        rayPick(SoRayPickAction *action);

    virtual void        callback(SoCallbackAction *action);

    static void         getScreenSize(SoState *state,
                                      const SbBox3f &boundingBox,
                                      SbVec2s &rectSize);

    virtual void        computeBBox(SoAction *action, SbBox3f &box,
                                    SbVec3f &center) = 0;
  
  public:
    typedef void VertexArrayRenderingCB(SoNode* shape, SoGLRenderAction*, bool useVbo, uint32_t numVertices);

    static void setPreVertexArrayRenderingCallback(VertexArrayRenderingCB* cb);
    static void setPostVertexArrayRenderingCallback(VertexArrayRenderingCB* cb);

    struct SimpleVertexArrayCache {
      SimpleVertexArrayCache();
 
      void drawArrays(SoShape* shape, SoGLRenderAction* action, GLenum primitiveType);
 
      void enableVertexAttributes(SoState* state);
 
      void disableVertexAttributes(SoState* state);
 
      SoVBO vbo;
 
      int numVertices;
 
      char* vertexOffset;
      char* normalOffset;
      char* texCoordOffset;
      char* colorOffset;
 
      bool useTexCoords;
      bool useNormals;
      bool useColors;
    };
 
  protected:
    SoShape();

    virtual void        generatePrimitives(SoAction *action) = 0;

    virtual bool        shouldGLRender(SoGLRenderAction *action);

    bool                shouldRayPick(SoRayPickAction *action);

    void                beginSolidShape(SoGLRenderAction *action);
    void                endSolidShape(SoGLRenderAction *action);

    void                computeObjectSpaceRay(SoRayPickAction *action);
    void                computeObjectSpaceRay(SoRayPickAction *action,
                                              const SbMatrix &matrix);

    virtual SoDetail *  createTriangleDetail(SoRayPickAction *action,
                                             const SoPrimitiveVertex *v1,
                                             const SoPrimitiveVertex *v2,
                                             const SoPrimitiveVertex *v3,
                                             SoPickedPoint *pp);
    virtual SoDetail *  createLineSegmentDetail(SoRayPickAction *action,
                                                const SoPrimitiveVertex *v1,
                                                const SoPrimitiveVertex *v2,
                                                SoPickedPoint *pp);
    virtual SoDetail *  createPointDetail(SoRayPickAction *action,
                                          const SoPrimitiveVertex *v,
                                          SoPickedPoint *pp);

    void                invokeTriangleCallbacks(SoAction *action,
                                                const SoPrimitiveVertex *v1,
                                                const SoPrimitiveVertex *v2,
                                                const SoPrimitiveVertex *v3);
    void                invokeLineSegmentCallbacks(SoAction *action,
                                                  const SoPrimitiveVertex *v1,
                                                  const SoPrimitiveVertex *v2);
    void                invokePointCallbacks(SoAction *action,
                                             const SoPrimitiveVertex *v);

    void                beginShape(SoAction *action, TriangleShape shapeType,
                                   SoFaceDetail *faceDetail = NULL);
    void                shapeVertex(const SoPrimitiveVertex *v);
    void                endShape();
 
    virtual ~SoShape();
    
    void                GLRenderBoundingBox(SoGLRenderAction *action);
 
  private:

    static SoGetBoundingBoxAction       *bboxAct;
    static SoCube                       *bboxCube;

    static bool         sendTexCoords;  
    static SoMaterialBundle *matlBundle;

    static TriangleShape        primShapeType;  
    static SoFaceDetail *faceDetail;    
    static int          nestLevel;      
    static SoAction     *primAction;    
    static int          primVertNum;    
    static int          polyVertNum;    
    static SoShape      *primShape;     

    static SoPrimitiveVertex *primVerts;        
    static SoPointDetail     *vertDetails;      
    static SoPrimitiveVertex *polyVerts;        
    static SoPointDetail     *polyDetails;      
    static int numPolyVertsAllocated;   
    static GLUtriangulatorObj  *tobj;   
    
    void                GLRenderTriangle(SoGLRenderAction *action,
                                         const SoPrimitiveVertex *v1,
                                         const SoPrimitiveVertex *v2,
                                         const SoPrimitiveVertex *v3);
    void                GLRenderLineSegment(SoGLRenderAction *action,
                                            const SoPrimitiveVertex *v1,
                                            const SoPrimitiveVertex *v2);
    void                GLRenderPoint(SoGLRenderAction *action,
                                      const SoPrimitiveVertex *v);

    void                rayPickTriangle(SoRayPickAction *action,
                                        const SoPrimitiveVertex *v1,
                                        const SoPrimitiveVertex *v2,
                                        const SoPrimitiveVertex *v3);
    void                rayPickLineSegment(SoRayPickAction *action,
                                           const SoPrimitiveVertex *v1,
                                           const SoPrimitiveVertex *v2);
    void                rayPickPoint(SoRayPickAction *action,
                                     const SoPrimitiveVertex *v);

    void                rayPickBoundingBox(SoRayPickAction *action);

    void                triangleVertex(const SoPrimitiveVertex *v,
                                       int vertToReplace);

    void                allocateVerts();

    static void CALLBACK beginCB(GLenum primType);
    static void CALLBACK vtxCB(void *vertex);
    static void CALLBACK endCB();
    static void CALLBACK errorCB(GLenum err);
 
protected:
    static VertexArrayRenderingCB* _preVertexArrayRenderingCB;
    static VertexArrayRenderingCB* _postVertexArrayRenderingCB;
};
 
#endif /* _SO_SHAPE_ */