glshape.h

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/*
 *  glshape.h - Paint 2D shapes in OpenGL
 *
 *  Written: 7/16/02 - JSF
 *
 *  Copyright (C) 2002  The Exult Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef GLSHAPE_H
#define GLSHAPE_H 1

#ifdef HAVE_OPENGL

class Xform_palette;
class Shape_frame;
class GL_texshape;
class Image_buffer8;

/*
 *  A 2D shape is rendered by painting a quad with the shape as a texture.
 */
class GL_texshape
  {
  Shape_frame *frame;   // Source for this (or null if it came
          //   from someplace else).
  unsigned int texture;   // Texture ID.
  unsigned int texsize;   // Width/ht of texture (power of 2).
          // Least-recently used chain:
  GL_texshape *lru_next, *lru_prev;
          // Create from this source.
  void create(Image_buffer8 *src, unsigned char *pal, 
        Xform_palette *xforms = 0, int xfcnt = 0);
public:
  friend class GL_manager;
  GL_texshape(Shape_frame *f, unsigned char *pal, 
        Xform_palette *xforms = 0, int xfcnt = 0);
  GL_texshape(Image_buffer8 *src, unsigned char *pal);
  ~GL_texshape();
  void paint(int px, int py); // Render at given position.
  };

/*
 *  Handle OpenGL rendering.
 */
class GL_manager
  {
  static GL_manager *instance;  // One one of these.
  int scale;      // Scale for drawing.
  int max_texsize;    // Largest size allowed.
  GL_texshape *shapes;    // Shapes in LRU chain.
  int num_shapes;
  unsigned char *palette;   // 3*256 bytes (rgb).
public:
  friend class GL_texshape;
  GL_manager();
  ~GL_manager();
  static GL_manager *get_instance()
    { return instance; }
  void set_palette(unsigned char *pal)
    { delete palette; palette = pal; }
          // Create from src (but don't add to
          //   chain).
  GL_texshape *create(Image_buffer8 *src)
    { return new GL_texshape(src, palette); }
          // Window was resized.
  void resized(int new_width, int new_height, int new_scale);
          // Paint a shape & create GL_shape
          //   for it if necessary.
  void paint(Shape_frame *frame, int px, int py,
        Xform_palette *xforms = 0, int xfcnt = 0);
  };


#else

class GL_manager
{
 public:
  static GL_manager *get_instance()
    { return 0; }
};

#endif  /* HAVE_OPENGL */


#endif  /* GLSHAPE_H */

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