primitiveStream.h

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/*
 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
 *
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 * Software is furnished to do so, subject to the following conditions:
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 * http://oss.sgi.com/projects/FreeB/
 * shall be included in all copies or substantial portions of the Software.
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 */
/*
*/
 
/*we do not use the constans GL_... so that this file is independent of 
 *<GL/gl.h>
 */
 
#ifndef _PRIMITIVE_STREAM_H
#define _PRIMITIVE_STREAM_H
 
enum {PRIMITIVE_STREAM_FAN, PRIMITIVE_STREAM_STRIP};
 
#include "definitions.h"
 
class primStream {
  Int *lengths; /*length[i]=number of vertices of ith primitive*/
  Int *types; /*each primive has a type: FAN or STREAM*/
  Real *vertices; /*the size >= 2 * num_vertices, each vertex (u,v)*/
 
  /*the following size information are used for dynamic arrays*/
  Int index_lengths; /*the current available entry*/
  Int size_lengths; /*the allocated size of the array: lengths*/
  Int index_vertices;
  Int size_vertices;
 
  /*the vertex is inserted one by one. counter is used to 
   *count the number of vertices which have been inserted so far in 
   *the current primitive
   */
  Int counter;
 
public:  
  primStream(Int sizeLengths, Int sizeVertices);
  ~primStream();
 
  Int get_n_prims() //num of primitives
    {
      return index_lengths;
    }
  Int get_type(Int i)  //the type of ith primitive
    {
      return  types[i];
    }
  Int get_length(Int i) //the length of the ith primitive
    {
      return lengths[i];
    }
  Real* get_vertices() {return vertices;}
 
  /*the begining of inserting a new primitive. 
   *reset counter to be 0.
   */
  void begin();
  void insert(Real u, Real v);
  void insert(Real v[2]) {insert(v[0], v[1]);}
  void end(Int type);
  
  Int num_triangles();
  
  void triangle(Real A[2], Real B[2], Real C[2])
    {
      begin();
      insert(A);
      insert(B);
      insert(C);
      end(PRIMITIVE_STREAM_FAN);
    }
  void print();
  void draw(); /*using GL to draw the primitives*/
};
 
 
 
 
 
 
  
 
#endif