#ifndef __al_included_allegro5_aintern_opengl_h
#define __al_included_allegro5_aintern_opengl_h

#include "allegro5/internal/aintern_bitmap.h"
#include "allegro5/internal/aintern_display.h"


enum {
   _ALLEGRO_OPENGL_VERSION_0     = 0, /* dummy */
   _ALLEGRO_OPENGL_VERSION_1_0   = 0x01000000,
   _ALLEGRO_OPENGL_VERSION_1_1   = 0x01010000,
   _ALLEGRO_OPENGL_VERSION_1_2   = 0x01020000,
   _ALLEGRO_OPENGL_VERSION_1_2_1 = 0x01020100,
   _ALLEGRO_OPENGL_VERSION_1_3   = 0x01030000,
   _ALLEGRO_OPENGL_VERSION_1_4   = 0x01040000,
   _ALLEGRO_OPENGL_VERSION_1_5   = 0x01050000,
   _ALLEGRO_OPENGL_VERSION_2_0   = 0x02000000,
   _ALLEGRO_OPENGL_VERSION_2_1   = 0x02010000,
   _ALLEGRO_OPENGL_VERSION_3_0   = 0x03000000,
   _ALLEGRO_OPENGL_VERSION_3_1   = 0x03010000,
   _ALLEGRO_OPENGL_VERSION_3_2   = 0x03020000,
   _ALLEGRO_OPENGL_VERSION_3_3   = 0x03030000,
   _ALLEGRO_OPENGL_VERSION_4_0   = 0x04000000
};

#define ALLEGRO_MAX_OPENGL_FBOS 8

struct ALLEGRO_BITMAP_OGL;

enum {
   FBO_INFO_UNUSED      = 0,
   FBO_INFO_TRANSIENT   = 1,  /* may be destroyed for another bitmap */
   FBO_INFO_PERSISTENT  = 2   /* exclusive to the owner bitmap */
};

typedef struct ALLEGRO_FBO_INFO
{
   int fbo_state;
   GLuint fbo;
   struct ALLEGRO_BITMAP_OGL *owner;
   double last_use_time;
} ALLEGRO_FBO_INFO;

typedef struct ALLEGRO_BITMAP_OGL
{
   ALLEGRO_BITMAP bitmap; /* This must be the first member. */

   /* Driver specifics. */

   int true_w;
   int true_h;

   GLuint texture; /* 0 means, not uploaded yet. */

#if defined ALLEGRO_GP2XWIZ
   EGLSurface pbuffer;
   EGLContext context;
   NativeWindowType pbuf_native_wnd;
   bool changed;
#else
   ALLEGRO_FBO_INFO *fbo_info;
#endif

   unsigned char *lock_buffer;

   float left, top, right, bottom; /* Texture coordinates. */
   bool is_backbuffer; /* This is not a real bitmap, but the backbuffer. */
} ALLEGRO_BITMAP_OGL;


typedef struct OPENGL_INFO {
   uint32_t version;       /* OpenGL version */
   int num_texture_units;  /* Number of texture units */
   int max_texture_size;   /* Maximum texture size */
   int is_voodoo3_and_under; /* Special cases for Voodoo 1-3 */
   int is_voodoo;          /* Special cases for Voodoo cards */
   int is_matrox_g200;     /* Special cases for Matrox G200 boards */
   int is_ati_rage_pro;    /* Special cases for ATI Rage Pro boards */
   int is_ati_radeon_7000; /* Special cases for ATI Radeon 7000 */
   int is_ati_r200_chip;	/* Special cases for ATI card with chip R200 */
   int is_mesa_driver;     /* Special cases for MESA */
} OPENGL_INFO;


typedef struct ALLEGRO_OGL_EXTRAS
{
   /* A list of extensions supported by Allegro, for this context. */
   ALLEGRO_OGL_EXT_LIST *extension_list;
   /* A list of extension API, loaded by Allegro, for this context. */
   ALLEGRO_OGL_EXT_API *extension_api;
   /* Various info about OpenGL implementation. */
   OPENGL_INFO ogl_info;

   ALLEGRO_BITMAP_OGL *opengl_target;

   ALLEGRO_BITMAP_OGL *backbuffer;

   /* True if display resources are shared among displays. */
   bool is_shared;

   ALLEGRO_FBO_INFO fbos[ALLEGRO_MAX_OPENGL_FBOS];
} ALLEGRO_OGL_EXTRAS;

typedef struct ALLEGRO_OGL_BITMAP_VERTEX
{
   float x, y;
   float tx, ty;
   float r, g, b, a;
} ALLEGRO_OGL_BITMAP_VERTEX;


/* extensions */
int  _al_ogl_look_for_an_extension(const char *name, const GLubyte *extensions);
void _al_ogl_set_extensions(ALLEGRO_OGL_EXT_API *ext);
void _al_ogl_manage_extensions(ALLEGRO_DISPLAY *disp);
void _al_ogl_unmanage_extensions(ALLEGRO_DISPLAY *disp);

/* bitmap */
ALLEGRO_BITMAP *_al_ogl_create_bitmap(ALLEGRO_DISPLAY *d, int w, int h);
ALLEGRO_BITMAP *_al_ogl_create_sub_bitmap(ALLEGRO_DISPLAY *d, ALLEGRO_BITMAP *parent,
                                          int x, int y, int w, int h);

/* common driver */
void _al_ogl_reset_fbo_info(ALLEGRO_FBO_INFO *info);
bool _al_ogl_create_persistent_fbo(ALLEGRO_BITMAP *bitmap);
ALLEGRO_FBO_INFO *_al_ogl_persist_fbo(ALLEGRO_DISPLAY *display,
                                      ALLEGRO_FBO_INFO *transient_fbo_info);
void _al_ogl_set_target_bitmap(ALLEGRO_DISPLAY *display, ALLEGRO_BITMAP *bitmap);
void _al_ogl_setup_bitmap_clipping(const ALLEGRO_BITMAP *bitmap);
ALLEGRO_BITMAP *_al_ogl_get_backbuffer(ALLEGRO_DISPLAY *d);
ALLEGRO_BITMAP_OGL* _al_ogl_create_backbuffer(ALLEGRO_DISPLAY *disp);
void _al_ogl_destroy_backbuffer(ALLEGRO_BITMAP_OGL *b);
bool _al_ogl_resize_backbuffer(ALLEGRO_BITMAP_OGL *b, int w, int h);

struct ALLEGRO_DISPLAY_INTERFACE;

/* draw */
void _al_ogl_add_drawing_functions(struct ALLEGRO_DISPLAY_INTERFACE *vt);

#endif
