quakeforge/include/glquake.h

/*
	glquake.h

	OpenGL-specific definitions and prototypes

	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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#ifndef __glquake_h
#define __glquake_h

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

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

#include <GL/gl.h>

#include "QF/cvar.h"
#include "QF/model.h"
#include "QF/qfgl_ext.h"
#include "QF/wad.h"


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

extern int		texture_extension_number;
extern int		texture_mode;

extern float	gldepthmin, gldepthmax;

void GL_Upload8 (byte *data, int width, int height,  qboolean mipmap, qboolean alpha);
void GL_Upload8_EXT (byte *data, int width, int height,  qboolean mipmap, qboolean alpha);
int GL_LoadTexture (char *identifier, int width, int height, byte *data, qboolean mipmap, qboolean alpha, int bytesperpixel);
int GL_FindTexture (char *identifier);

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;

#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 MAX_GLTEXTURES	2048

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

#define SKYSHIFT		7
#define	SKYSIZE			(1 << SKYSHIFT)
#define SKYMASK			(SKYSIZE - 1)
#define SKY_TEX			2000	// Quake 2 environment sky

#define BACKFACE_EPSILON	0.01

extern	qboolean	envmap;
extern	int	currenttexture;
extern	int	cnttextures[2];
extern	int	particletexture;
extern	int	netgraphtexture;
extern	int	netgraphtexture;	// netgraph texture
extern	int	playertextures;
extern	int	player_fb_textures;

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

extern cvar_t	*r_novis;
extern cvar_t	*r_particles;
extern cvar_t	*r_norefresh;
extern cvar_t	*r_drawviewmodel;
extern cvar_t	*r_shadows;
extern cvar_t	*r_wateralpha;
extern cvar_t	*r_waterripple;
extern cvar_t	*r_dynamic;
extern cvar_t	*r_netgraph;
extern cvar_t	*r_lightmap;
extern cvar_t	*r_mirroralpha;

extern cvar_t	*gl_affinemodels;
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_fb_bmodels;
extern cvar_t	*gl_fb_models;
extern cvar_t   *gl_dlight_lightmap;
extern cvar_t	*gl_dlight_polyblend;
extern cvar_t	*gl_dlight_smooth;
extern cvar_t	*gl_keeptjunctions;
extern cvar_t	*gl_reporttjunctions;
extern cvar_t	*gl_flashblend;
extern cvar_t	*gl_multitexture;
extern cvar_t	*gl_nocolors;
extern cvar_t	*gl_doubleeyes;

extern cvar_t	*gl_ztrick;
extern cvar_t	*gl_finish;
extern cvar_t	*gl_clear;
extern cvar_t	*gl_subdivide_size;
extern cvar_t	*gl_particles;
extern cvar_t	*gl_fires;
extern cvar_t	*gl_fb_models;
extern cvar_t	*gl_fb_bmodels;
extern cvar_t	*gl_poly;
extern cvar_t	*gl_polyblend;

extern cvar_t	*gl_max_size;
extern cvar_t	*gl_playermip;

extern cvar_t	*r_skyname;
extern cvar_t	*gl_skymultipass;
extern cvar_t	*gl_sky_clip;
extern cvar_t	*gl_sky_divide;

extern int		mirrortexturenum;	// quake texturenum, not gltexturenum
extern qboolean	mirror;
extern qboolean	lighthalf;
extern mplane_t	*mirror_plane;
extern int		gl_lightmap_format;
extern int		gl_solid_format;
extern int		gl_alpha_format;

extern unsigned char lighthalf_v[3];

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

void GL_Bind (int texnum);

// Multitexture

#define    TEXTURE0_SGIS                               0x835E
#define    TEXTURE1_SGIS                               0x835F

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

typedef void (APIENTRY *lpMTexFUNC) (GLenum, GLfloat, GLfloat);
typedef void (APIENTRY *lpSelTexFUNC) (GLenum);
extern lpMTexFUNC qglMTexCoord2fSGIS;
extern lpSelTexFUNC qglSelectTextureSGIS;
extern lpMTexFUNC qglMTexCoord2f;
extern lpSelTexFUNC qglSelectTexture;

extern qboolean gl_mtexable;

void GL_SubdivideSurface (msurface_t *fa);

// Multitexturing
extern QF_glActiveTextureARB	qglActiveTexture;
extern QF_glMultiTexCoord2fARB	qglMultiTexCoord2f;
extern qboolean 				gl_mtex_capable;
extern GLenum					gl_mtex_enum;
// convenience check
#define gl_mtex_active	(gl_mtex_capable && gl_multitexture->int_val)

void GL_DisableMultitexture (void);
void GL_EnableMultitexture (void);
void GL_BuildLightmaps (void);
void GL_Upload8_EXT (byte *data, int width, int height,  qboolean mipmap, qboolean alpha) ;
void GL_Set2D (void);
void GL_CheckGamma (unsigned char *pal);
void GL_CheckBrightness (unsigned char *pal);

typedef struct {
	int		key;                    // allows reusability
	vec3_t	origin, owner;
	float	size;
	float	die, decay;             // duration settings
	float	minlight;               // lighting threshold
	float	color[3];               // RGB
} fire_t;

struct entity_s;
void R_AddFire (vec3_t, vec3_t, struct entity_s *ent);
fire_t *R_AllocFire (int);
void R_DrawFire (fire_t *);
void R_UpdateFires (void);

void R_DrawBrushModel (struct entity_s *e);
void R_DrawWorld (void);
void R_RenderDlights (void);
void R_DrawSky (void);
void R_DrawSkyChain (msurface_t *s);
void EmitWaterPolys (msurface_t *fa);
void R_RotateForEntity (struct entity_s *e);
void EmitWaterPolys (msurface_t *fa);
void R_NetGraph (void);
void R_LoadSkys (const char *sky);

extern float bubble_sintable[], bubble_costable[];
extern float v_blend[4];

void AddLightBlend (float, float, float, float);
extern	int			c_brush_polys, c_alias_polys;
extern	float		r_world_matrix[16];

#endif // __glquake_h