/*
Copyright (C) 1996-1997 Id Software, Inc.

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.

*/
// disable data conversion warnings

#pragma warning(disable : 4244)     // MIPS
#pragma warning(disable : 4136)     // X86
#pragma warning(disable : 4051)     // ALPHA
#pragma warning(disable : 4305)     // MSVC++ 6
#pragma warning(disable : 4018)     // MSVC++ 4

#ifdef _WIN32
#include <windows.h>
#endif

#include <GL/gl.h>
#include <GL/glu.h>
// tQER<1>:
// Include nVidia extensions
#include <GL/glext.h>

void GL_BeginRendering (int *x, int *y, int *width, int *height);
void GL_EndRendering (void);


#ifdef _WIN32
// Function prototypes for the Texture Object Extension routines
typedef GLboolean (APIENTRY *ARETEXRESFUNCPTR)(GLsizei, const GLuint *,
                    const GLboolean *);
typedef void (APIENTRY *BINDTEXFUNCPTR)(GLenum, GLuint);
typedef void (APIENTRY *DELTEXFUNCPTR)(GLsizei, const GLuint *);
typedef void (APIENTRY *GENTEXFUNCPTR)(GLsizei, GLuint *);
typedef GLboolean (APIENTRY *ISTEXFUNCPTR)(GLuint);
typedef void (APIENTRY *PRIORTEXFUNCPTR)(GLsizei, const GLuint *,
                    const GLclampf *);
typedef void (APIENTRY *TEXSUBIMAGEPTR)(int, int, int, int, int, int, int, int, void *);

extern	BINDTEXFUNCPTR bindTexFunc;
extern	DELTEXFUNCPTR delTexFunc;
extern	TEXSUBIMAGEPTR TexSubImage2DFunc;
#endif

extern	int texture_extension_number;
extern	int texture_mode;

extern	float	gldepthmin, gldepthmax;

void GL_Upload32 (void *data, int width, int height,  qboolean mipmap, qboolean alpha, char *name);
void GL_Upload8 (byte *data, int width, int height,  qboolean mipmap, qboolean alpha, char *name);

int GL_LoadTextureFree (char *identifier, int width, int height, byte *data, qboolean mipmap, qboolean alpha);
int GL_LoadTexture (char *identifier, int width, int height, byte *data, qboolean mipmap, qboolean alpha);
int GL_LoadTexture32 (char *identifier, int width, int height, byte *data, qboolean mipmap, qboolean alpha);
int GL_LoadTextureXX (char *identifier, int width, int height, byte *data, qboolean mipmap, qboolean alpha, int bytes, qboolean free);
int GL_FindTexture (char *identifier);
int GL_LoadPicTexture (char *name, qpic_t *pic);

typedef struct
{
	float	x, y, z;
	float	s, t;
	float	r, g, b;
} glvert_t;

extern glvert_t glv;

extern	int glx, gly, glwidth, glheight;

#ifdef _WIN32
extern	PROC glArrayElementEXT;
extern	PROC glColorPointerEXT;
extern	PROC glTexturePointerEXT;
extern	PROC glVertexPointerEXT;
#endif

// r_local.h -- private refresh defs

#define ALIAS_BASE_SIZE_RATIO	(1.0 / 11.0)
					// normalizing factor so player model works out to about
					//  1 pixel per triangle
#define	MAX_LBM_HEIGHT		480

#define TILE_SIZE		128		// size of textures generated by R_GenTiledSurf

#define SKYSHIFT		7
#define	SKYSIZE			(1 << SKYSHIFT)
#define SKYMASK			(SKYSIZE - 1)

#define BACKFACE_EPSILON	0.01

#define GL_FARCLIP		16384
#define NO_CACHE_MESH		1

void R_TimeRefresh_f (void);
void R_ReadPointFile_f (void);
texture_t *R_TextureAnimation (texture_t *base);

typedef struct surfcache_s
{
	struct surfcache_s  *next;
	struct surfcache_s  **owner;		// NULL is an empty chunk of memory
	int		    lightadj[MAXLIGHTMAPS]; // checked for strobe flush
	int		    dlight;
	int		    size;		// including header
	unsigned	    width;
	unsigned	    height;		// DEBUG only needed for debug
	float		    mipscale;
	struct texture_s    *texture;		// checked for animating textures
	byte		    data[4];		// width*height elements
} surfcache_t;


typedef struct
{
	pixel_t		*surfdat;	// destination for generated surface
	int		rowbytes;	// destination logical width in bytes
	msurface_t	*surf;		// description for surface to generate
	fixed8_t	lightadj[MAXLIGHTMAPS];
					// adjust for lightmap levels for dynamic lighting
	texture_t	*texture;	// corrected for animating textures
	int		surfmip;	// mipmapped ratio of surface texels / world pixels
	int		surfwidth;	// in mipmapped texels
	int		surfheight;	// in mipmapped texels
} drawsurf_t;


typedef enum {
	pt_static, pt_grav, pt_slowgrav, pt_fire, pt_explode, pt_explode2, pt_blob, pt_blob2, pt_dust, pt_smoke, pt_snow, pt_bulletpuff, pt_bloodcloud, pt_fadespark, pt_fadespark2, pt_fallfadespark, pt_fallfadespark2, pt_bubble
} ptype_t;

// !!! if this is changed, it must be changed in d_ifacea.h too !!!
typedef struct particle_s
{
// driver-usable fields
	vec3_t		    org;
	float		    color;
// drivers never touch the following fields
	struct particle_s   *next;
	vec3_t		    vel;
	float		    ramp;
	float		    die;
	ptype_t		    type;
	// LordHavoc: added for improved particle effects
	float		    scale;
	int		    texnum;
	float		    alpha; // 0-255
	float		    time2; // used for various things (snow fluttering, for example)

	byte		    style;
	float		    roll;

} particle_t;


//====================================================


extern	entity_t	r_worldentity;
extern	qboolean	r_cache_thrash;		// compatability
extern	vec3_t		modelorg, r_entorigin;
extern	entity_t	*currententity;
extern	int		r_visframecount;	// ??? what difs?
extern	int		r_framecount;
extern	mplane_t	frustum[4];
extern	int		c_brush_polys, c_alias_polys;


//
// view origin
//
extern	vec3_t	vup;
extern	vec3_t	vpn;
extern	vec3_t	vright;
extern	vec3_t	r_origin;

//
// screen size info
//
extern	refdef_t    r_refdef;
extern	mleaf_t	    *r_viewleaf, *r_oldviewleaf;
extern	texture_t   *r_notexture_mip;
extern	int	    d_lightstylevalue[256];	// 8.8 fraction of base light value

extern	qboolean    envmap;
extern	int	    currenttexture;
extern	int	    cnttextures[2];
extern	int	    particletexture;
extern	int	    playertextures;
extern	int	    skyboxtextures; 
// tQER<1>:
extern   int	    smoketexture;

extern	int	    skytexturenum;		// index in cl.loadmodel, not gl texture object

extern msurface_t   *skychain, *waterchain;

extern	cvar_t	r_norefresh;
extern	cvar_t	r_drawentities;
extern	cvar_t	r_drawworld;
extern	cvar_t	r_drawviewmodel;
extern	cvar_t	r_speeds;
extern	cvar_t	r_fullbright;
extern	cvar_t	r_lightmap;
extern	cvar_t	r_shadows;
extern	cvar_t	r_mirroralpha;
extern	cvar_t	r_wateralpha;
extern	cvar_t	r_dynamic;
extern	cvar_t	r_novis;
extern	cvar_t	r_flatlightstyles;
extern	cvar_t	r_clearcolor;
extern	cvar_t	r_oldsky;

extern	cvar_t	gl_interpolations;      //TOPAZ
extern	cvar_t	gl_asynch;              //TOPAZ

extern	cvar_t	gl_finish;
extern	cvar_t	gl_clear;
extern	cvar_t	gl_cull;
extern	cvar_t	gl_poly;
extern	cvar_t	gl_texsort;
extern	cvar_t	gl_smoothmodels;
extern	cvar_t	gl_affinemodels;
extern	cvar_t	gl_polyblend;
extern	cvar_t	gl_keeptjunctions;
extern	cvar_t	gl_flashblend;
extern	cvar_t	gl_nocolors;
extern	cvar_t	gl_doubleeyes;
extern  cvar_t  gl_subdivide_size;
extern  cvar_t  gl_autobright;

extern	int	gl_lightmap_format;
extern	int	gl_solid_format;
extern	int	gl_alpha_format;

extern	cvar_t	gl_max_size;
extern	cvar_t	gl_playermip;
// tQER<1>:
extern	cvar_t	snd_freq;

extern	int	    mirrortexturenum;	// quake texturenum, not gltexturenum
extern	qboolean    mirror;
extern	mplane_t    *mirror_plane;

extern	float	r_world_matrix[16];

extern	const char *gl_vendor;
extern	const char *gl_renderer;
extern	const char *gl_version;
extern	const char *gl_extensions;

void R_TranslatePlayerSkin (int playernum);
void GL_Bind (int texnum);

// Multitexture
extern GLenum gl_oldtarget;
extern GLenum gl_Texture0;
extern GLenum gl_Texture1;
#define    TEXTURE0_SGIS gl_Texture0
#define    TEXTURE1_SGIS gl_Texture1

#ifndef _WIN32
#define APIENTRY /* */
#endif

typedef void (APIENTRY *lpMTexFUNC) (GLenum, GLfloat, GLfloat);
typedef void (APIENTRY *lpSelTexFUNC) (GLenum);
extern lpMTexFUNC qglMTexCoord2fSGIS;
extern lpSelTexFUNC qglSelectTextureSGIS;

extern qboolean gl_mtexable;

void GL_DisableMultitexture(void);
void GL_EnableMultitexture(void);
void GL_LightMaps_f (void);

extern   bspversion;
