opengl.h

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#ifndef OPENGL_H
#define OPENGL_H

#include <string>
#include <map>

#include "gl.h"

#include "image.h"
#include "io.h"

/* OpenGL state flags.  */
#define OGL_TEXTURE_2D     0x01
#define OGL_BLEND          0x02
#define OGL_LIGHTING       0x04
#define OGL_COLOR_MATERIAL 0x08
#define OGL_LIGHT0         0x10
#define OGL_LIGHT1         0x20
#define OGL_CULL_FACE      0x40
#define OGL_DEPTH_TEST     0x80

void OGL_State (uint s);

void OGL_CheckError (void);

void OGL_RegisterWindow (const IO_Window *win);

void OGL_SelectWindow (const IO_Window *win);

void OGL_UnregisterWindow (const IO_Window *win);

/* Texture creation flags.  */
#define OGL_2D    0x01

#define OGL_CLAMP 0x02

#define OGL_ALPHA 0x04

class Texture
{
public:
  Texture (void)
    {
      rc = NULL;
    }

  Texture (const std::string &file, const uint flags = 0);

  Texture (Image &img, const uint flags = 0);

  Texture (const Texture &t) : names (t.names)
    {
      rc = t.rc;
      if (rc != NULL)
        {
          (*rc)++;
          img = t.img;
          flags = t.flags;
        }
    }

  Texture &operator = (const Texture &t)
    {
      if (rc != NULL)
        {
          (*rc)--;
          if (*rc == 0)
            {
              delete rc;
              Unload ();
            }
        }

      rc = t.rc;
      if (rc != NULL)
        {
          (*rc)++;
          img = t.img;
          flags = t.flags;
          names = t.names;
        }

      return (*this);
    }

  void Select (void) const;

  ~Texture (void)
    {
      if (rc != NULL)
        {
          (*rc)--;
          if (*rc == 0)
            {
              delete rc;
              Unload ();
            }
        }
    }

  bool operator == (const Texture &t)
    {
      return (rc == t.rc);
    }

  void AddWindow (const IO_Window *win);

  void RemoveWindow (const IO_Window *win);

private:
  /* Unloads the texture from all windows.  */
  void Unload (void);

  /* Reference count.  */
  int *rc;

  /* The texture image.  */
  Image img;

  /* The creation flags.  */
  uint flags;

  /* List of associations between windows and texture names.  */
  std::map <IO_Window *, uint> *names;
};

#endif

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