gltrimesh.h

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/*! \file
  \brief  The disti::GLTriMesh class.  Implements Triangle Meshes.

  \par Copyright Information

  Copyright (c) 2015 by The DiSTI Corporation.<br>
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*/

#ifndef _GL_TRI_MESH_H
#define _GL_TRI_MESH_H

#include "display.h"
#include "gls_cpp_lang_support.h"
#ifndef GLES
#include "gls_display_list.h"
#endif
#include "glpolygon.h"
#include "disti_metadata.h"
#ifdef GLES
#include "gls_index_array.h"
#include "dynamic_array.h"
#endif

namespace disti
{

// Forward Declaration
class GlsGloFileAttribute;

// SetValue enumerations
enum {
    GLS_TRIMESH_FIRST_VALUE = GLS_LAST_INITIALIZER+1,
    GLS_TRIMESH_USE_DISPLAY_LIST, // whether or not to use a display list
    GLS_TRIMESH_FACES
 };

/**
  \brief Structure for holding mesh vertex indices
  */
typedef struct
{ 
    int a,b,c;    /** Vertex indices of the face */
    int texture;  /** Texture index of face */
    unsigned int material; /** Material index of face */
} GLMeshFace;

/** The GLMeshVertex structure.  Defines all of the attributes of a TriMesh vertex.  Used in generated code.
  */
typedef struct
{
    float         vertex[3];    /**< The vertex coordinate */
    unsigned char color[4];     /**< The vertex color */
    float         texCoord[2];  /**< The texture coordinate */
    float         normal[3];    /**< The vertex normal */
} GLMeshVertex;


/**
  \brief  The glTriMesh class.  Implements Triangle Meshes
*/
class GLTriMesh : public GLPolygon
{
protected:
void DrawSolidMesh(unsigned int faceOffset, unsigned int faceCount, bool textureObject,bool gouraudShading,bool perVertexLighting);
void DrawOutlineMesh();
//void DrawPointsMesh();

public:

    typedef GLPolygon _BaseClass;
    friend class GLTriMeshEditor;

#ifdef GLES
    GlsIndexArray _indices;
#else
    /** Stores object in display list for faster drawing */
    GlsDisplayList _displayList;
#endif

    /* Override base class since a mesh can have multiple textures */
    GLS_EXPORT int TextureIndex(void);

    /* Override base class since a mesh can have multiple textures */  
    GLS_EXPORT void TextureIndex(int index);

    /* Override base class since a mesh can have multiple materials */
    GLS_EXPORT void MaterialIndices(DynamicArray<int> index);

    /** Gets a vector of material indices. */
    GLS_EXPORT DynamicArray<int> & MaterialIndices();

    /* Override base class since a mesh can have multiple materials */
    GLS_EXPORT void MaterialIndex(unsigned int index);

    /* Override base class since a mesh can have multiple materials */
    GLS_EXPORT int MaterialIndex();

    /** Provides access to the faces stored in this mesh */
    GLS_EXPORT GLMeshFace *Faces(void) { return _faces; }

    /* See base class */
    virtual GLS_EXPORT void CopyGeometry(DisplayObject *src);

    /* See base class */
    virtual GLS_EXPORT DisplayObject *CloneObject(bool generateNames = false);

    /* See base class */
    virtual GLS_EXPORT void CopyProperties(DisplayObject *src);

    /* See base class*/
    virtual GLS_EXPORT void SetValue(int spec,va_list &args);

    /* Copies the attributes from an object (possibly a group) to this one. Used by the 
      * mesh creator to copy properties from the objectrs that were converted into this mesh.
      * \param src   The object to copy properties from */
    GLS_EXPORT void AssignPropertiesFromGroup(DisplayObject *src);

    /** Sets the number of faces in the mesh and allocates the face array 
      * \param n  The new number of faces for the mesh
      */
    GLS_EXPORT void NumberOfFaces(unsigned int n);
    
    /** \return The number of faces in this mesh */
    GLS_EXPORT unsigned int NumberOfFaces(void) { return _nFaces; }

    /** For all faces of the mesh that have the old material, replace that material 
      * with the new material.
      * \param oldIndex  Old material index
      * \param newIndex  New material index
      */
    GLS_EXPORT void ReplaceMaterial(unsigned int oldIndex,unsigned int newIndex);

    /** Sets the vertices and texture index of a specific face 
      * \param face
      * \param a  The vertex index for the first vertex of the triangle
      * \param b  The vertex index for the second vertex of the triangle
      * \param c  The vertex index for the third vertex of the triangle
      * \param tindex  The texture index for triangle
      * \param materialIndex  The material index for triangle
      */
    GLS_EXPORT void SetFace(unsigned int face,int a,int b,int c,int tindex, unsigned int materialIndex = 0);

    /** Sets all the faces of the mesh. Used in runtime. 
      * \param numFaces  The number of faces that will be passed in
      * \param ... A variable argument field which will be numFaces instances of a,b,c,tindex,materialIndex 
      */
    GLS_EXPORT void VaSetFaces(unsigned int numFaces,...);

    /** Sets all the faces of the mesh. Used in parser
      * \param nFaces  The number of faces that will be set
      * \param faces  An array of GLMeshFaces with nFaces elements
      */
    GLS_EXPORT void SetFaces(unsigned int nFaces,GLMeshFace *faces);

    /** Sets all the faces and vertices of the mesh.  Used in generated code
      * \param nVertices  Number of vertices
      * \param vertices   Array of initialized vertices
      * \param nFaces      Number of faces
      * \param faces      Array of initialized faces
      */
    GLS_EXPORT void SetVerticesAndFaces(unsigned int nVertices,const GLMeshVertex *vertices,unsigned int nFaces,const GLMeshFace *faces);

    /** Creates a GLTriMesh with the vertices specified
      * \param nVertices   The number of vertices in the new polygon
      * \param vertices  The array of vertices for the polygon
      */
    GLS_EXPORT GLTriMesh(unsigned int nVertices,Vertex *vertices);

    /** Creates a GLTriMesh with the vertices specified
      * \param nVertices The number of vertices in the new polygon
      * \param vertices  The array of vertices for the polygon
      * \param location  The location point of the object
      */
    GLS_EXPORT GLTriMesh(unsigned int nVertices,Vertex *vertices, Vertex &location);

    /** Allocate a (blank) GLTriMesh object */
    GLS_EXPORT GLTriMesh(void);

    GLS_EXPORT GLTriMesh( const GLTriMesh& that, const bool generateNames );

    /** Destroy a GLTriMesh object */
    virtual GLS_EXPORT ~GLTriMesh(void);
  
    static GLS_EXPORT DisplayObject* CreateInstance();

    virtual GLS_EXPORT void SetAvailableAttributes(unsigned int value);

#ifdef GLES
    /* See base class */
    virtual GLS_EXPORT void PreDraw(const OpenGLMatrices& current, Culler& culler);
#endif

    /* See base class */
    virtual GLS_EXPORT void Draw(void);

    /* See base class */
    virtual GLS_EXPORT bool Hit(float x,float y,float z,float scale, const Vector& directionVector,Vector *collisionPoint);

#ifndef GLES
    /* See base class */
    virtual GLS_EXPORT InterfaceListType* GetCppInterfaceDescription(InterfaceListType* addToThisList= NULL );

    /* See base class */
    virtual GLS_EXPORT void GetCppInterfaceDescriptionFree(InterfaceListType* array);

    virtual GLS_EXPORT void UseDisplayList(const bool &flag);
    virtual GLS_EXPORT bool UseDisplayList(void);
#endif

    /** Causes the display list for this object to be recomputed */
    GLS_EXPORT void InvalidateGeometry(void)
    {
#ifndef GLES
        _displayList.Invalidate();
#endif
    }
    
#ifdef GLES
    GLS_EXPORT void DirtyTextureData(void);
#endif

protected:

#ifndef GLES
    /** Contains the actual OpenGL drawing commands to draw the object */
    virtual GLS_EXPORT void DrawGeometry(void);
#endif
    /* A mesh can have multiple textures */  
    virtual GLS_EXPORT bool SetupTexture(const int textureIndex);

#ifdef GLES
    /** Set a single attribute from the GLO file.
     * \param data The attribute to set and its associated data.
     */
    virtual GLS_EXPORT void SetFromGloData(GlsGloFileAttribute &data);
#endif
    
private:

    unsigned int _nFaces; /** Number of faces (triangles) in this mesh */

    GLMeshFace *_faces;  /** Array of vertex indices for triangles */

    DynamicArray<int> _newMaterialIndices; /** Intermediate data storage to make the setting of new material indices through the Faces simpler. */
    
#ifdef GLES
    /* Resizable array of indices into the faces array where the active texture is different from
     * the previous face.
     */
    DynamicArray<unsigned int> _textureChangeIndices;
    bool _textureChangesDirty; /** true if _textureSwitchIndices needs to be recomputed */
    
    /* Utility routine used by Draw. Should only be called when _textureSwitchDirty is true.
     * Rebuilds the _textureSwitchIndices array by scanning the data in the face array
     * and taking note when the texture index changes between faces.
     */
    void RecalculateTextureChanges();
#endif
    /* Utility routine used by Hit.  Performs a "FirstHit" test, which performs a hit test on the object
     * but does not guarantee that the collision point returned by Hit is the closest collision point
     * to the observer
     * \param point            The logical coordinate of the click, relative to the object
     * \param directionVector  The direction of the pick vector
     * \param collisionPoint   Set to the point on the object hit by directionVector
     * \return boolean indicating if the object was hit by the mouse
     */
    bool FirstHit(const Vector &point,const Vector& directionVector,Vector *collisionPoint);

    /* Utility routine used by Hit.  Performs a "BestHit" test, which performs a hit test on the object
      * and guarantees that the collision point returned by Hit is the closest collision point to the observer.
      * \param point            The logical coordinate of the click, relative to the object
      * \param directionVector  The direction of the pick vector
      * \param collisionPoint   Set to the point on the object hit by directionVector
      * \return boolean indicating if the object was hit by the mouse
      */
    bool BestHit(const Vector &point,const Vector& directionVector,Vector *collisionPoint);

    /* Utility routines used to detect when the material indices has changed */
    void OnMatChanged();
    void OnMatChanged(DynamicArray<int> &a, DynamicArray<int> &b);

    GLTriMesh& operator=( const GLTriMesh& ) DISTI_SPECIAL_MEM_FUN_DELETE;
    GLTriMesh( const GLTriMesh& ) DISTI_SPECIAL_MEM_FUN_DELETE;

    void CopyGeometryInternal( GLTriMesh* src );
    void CopyPropertiesInternal( GLTriMesh* src );

};

/** The DistiAttributeMeshFaceArray class.  Defines metadata for the GlMeshFace type.
  */
class DistiAttributeMeshFaceArray : public DistiAttributeBase
{
    GLMeshFace **_attribPtr;
    unsigned int *_numFaces;
    bool         _compatabilityMode;
public:
    GLS_EXPORT DistiAttributeMeshFaceArray(CallbackMethodCallerBase* callback, const AttributeName &name, GLMeshFace **attribPtr, unsigned int *numFaces,bool compatabilityMode);

    virtual GLS_EXPORT ~DistiAttributeMeshFaceArray();

    virtual GLS_EXPORT bool OkToWrite() const;

    virtual GLS_EXPORT std::ostream & WriteValue(std::ostream &);
    virtual GLS_EXPORT std::istream & ReadValue(std::istream &);
};

} // namespace disti

#endif