gltrimesh.h

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

  \par Copyright Information

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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 "disti_metadata.h"
#include "glpolygon.h"
#ifdef GLES
#    include "dynamic_array.h"
#    include "gls_index_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          _inRuntimeMode;

public:
    GLS_EXPORT DistiAttributeMeshFaceArray( CallbackMethodCallerBase* callback, const AttributeName& name, GLMeshFace** attribPtr, unsigned int* numFaces, bool inRuntimeMode );

    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