/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
Copyright (C) 2000-2013 Darklegion Development
Copyright (C) 2015-2019 GrangerHub

This file is part of Tremulous.

Tremulous 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 3 of the License,
or (at your option) any later version.

Tremulous 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 Tremulous; if not, see <https://www.gnu.org/licenses/>

===========================================================================
*/
#ifndef TR_COMMON_H
#define TR_COMMON_H

#include "qcommon/cvar.h"
#include "qcommon/q_shared.h"
#include "sys/sys_shared.h"

#include "iqm.h"
#include "qgl.h"
#include "tr_public.h"

typedef enum
{
	IMGTYPE_COLORALPHA, // for color, lightmap, diffuse, and specular
	IMGTYPE_NORMAL,
	IMGTYPE_NORMALHEIGHT,
	IMGTYPE_DELUXE, // normals are swizzled, deluxe are not
} imgType_t;

typedef enum
{
	IMGFLAG_NONE           = 0x0000,
	IMGFLAG_MIPMAP         = 0x0001,
	IMGFLAG_PICMIP         = 0x0002,
	IMGFLAG_CUBEMAP        = 0x0004,
	IMGFLAG_NO_COMPRESSION = 0x0010,
	IMGFLAG_NOLIGHTSCALE   = 0x0020,
	IMGFLAG_CLAMPTOEDGE    = 0x0040,
	IMGFLAG_GENNORMALMAP   = 0x0100,
} imgFlags_t;

typedef struct image_s {
	char		imgName[MAX_QPATH];		// game path, including extension
	int			width, height;				// source image
	int			uploadWidth, uploadHeight;	// after power of two and picmip but not including clamp to MAX_TEXTURE_SIZE
	GLuint		texnum;					// gl texture binding

	int			frameUsed;			// for texture usage in frame statistics

	int			internalFormat;
	int			TMU;				// only needed for voodoo2

	imgType_t   type;
	int /*imgFlags_t*/  flags;

	struct image_s*	next;
} image_t;

// any change in the LIGHTMAP_* defines here MUST be reflected in
// R_FindShader() in tr_bsp.c
#define LIGHTMAP_2D         -4	// shader is for 2D rendering
#define LIGHTMAP_BY_VERTEX  -3	// pre-lit triangle models
#define LIGHTMAP_WHITEIMAGE -2
#define LIGHTMAP_NONE       -1

extern	refimport_t		ri;
extern glconfig_t	glConfig;		// outside of TR since it shouldn't be cleared during ref re-init

//
// cvars
//
extern cvar_t *r_stencilbits;			// number of desired stencil bits
extern cvar_t *r_depthbits;			// number of desired depth bits
extern cvar_t *r_colorbits;			// number of desired color bits, only relevant for fullscreen
extern cvar_t *r_alphabits;			// number of desired alpha bits
extern cvar_t *r_texturebits;			// number of desired texture bits
extern cvar_t *r_ext_multisample;
										// 0 = use framebuffer depth
										// 16 = use 16-bit textures
										// 32 = use 32-bit textures
										// all else = error

extern cvar_t	*r_width;
extern cvar_t	*r_height;
extern cvar_t	*r_pixelAspect;
extern cvar_t *r_noborder;
extern cvar_t *r_fullscreen;
extern cvar_t *r_ignorehwgamma;		// overrides hardware gamma capabilities
extern cvar_t *r_drawBuffer;
extern cvar_t *r_swapInterval;

extern cvar_t *r_allowExtensions;				// global enable/disable of OpenGL extensions
extern cvar_t *r_ext_compressed_textures;		// these control use of specific extensions
extern cvar_t *r_ext_multitexture;
extern cvar_t *r_ext_compiled_vertex_array;
extern cvar_t *r_ext_texture_env_add;

extern cvar_t *r_ext_texture_filter_anisotropic;
extern cvar_t *r_ext_max_anisotropy;

extern cvar_t *r_stereoEnabled;

extern	cvar_t	*r_saveFontData;

qboolean	R_GetModeInfo( int *width, int *height, float *windowAspect, int mode );

float R_NoiseGet4f( float x, float y, float z, double t );
void  R_NoiseInit( void );

image_t     *R_FindImageFile( const char *name, imgType_t type, int/*imgFlags_t*/ flags );
image_t *R_CreateImage( const char *name, byte *pic, int width, int height, imgType_t type, int flags, int internalFormat );

void R_IssuePendingRenderCommands( void );
qhandle_t		 RE_RegisterShaderLightMap( const char *name, int lightmapIndex );
qhandle_t		 RE_RegisterShader( const char *name );
qhandle_t		 RE_RegisterShaderNoMip( const char *name );
qhandle_t RE_RegisterShaderFromImage(const char *name, int lightmapIndex, image_t *image, qboolean mipRawImage);

// font stuff
void R_InitFreeType( void );
void R_DoneFreeType( void );
void RE_RegisterFont(const char *fontName, int pointSize, fontInfo_t *font);

/*
=============================================================

IMAGE LOADERS

=============================================================
*/

void R_LoadBMP( const char *name, byte **pic, int *width, int *height );
void R_LoadJPG( const char *name, byte **pic, int *width, int *height );
void R_LoadPCX( const char *name, byte **pic, int *width, int *height );
void R_LoadPNG( const char *name, byte **pic, int *width, int *height );
void R_LoadTGA( const char *name, byte **pic, int *width, int *height );

/*
====================================================================

IMPLEMENTATION SPECIFIC FUNCTIONS

====================================================================
*/

void		GLimp_Init( bool );
void		GLimp_Shutdown( void );
void		GLimp_EndFrame( void );
void		GLimp_LogComment(const char *comment);
void		GLimp_Minimize(void);
void		GLimp_SetGamma( unsigned char red[256], unsigned char green[256], unsigned char blue[256] );

#endif