/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2002-2009 John Fitzgibbons and others
Copyright (C) 2010-2014 QuakeSpasm developers

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.
*/

#ifndef spingle__gl_texmgr_h
#define spingle__gl_texmgr_h

//gl_texmgr.h -- texture manager. manages opengl texture images

#define TEXPREF_NONE                    0x0000
#define TEXPREF_MIPMAP                  0x0001  // generate mipmaps
// TEXPREF_NEAREST and TEXPREF_LINEAR aren't supposed to be ORed with TEX_MIPMAP
#define TEXPREF_LINEAR                  0x0002  // force linear
#define TEXPREF_NEAREST                 0x0004  // force nearest
#define TEXPREF_ALPHA                   0x0008  // allow alpha
#define TEXPREF_PAD                     0x0010  // allow padding
#define TEXPREF_PERSIST                 0x0020  // never free
#define TEXPREF_OVERWRITE               0x0040  // overwrite existing same-name texture
#define TEXPREF_NOPICMIP                0x0080  // always load full-sized
#define TEXPREF_FULLBRIGHT              0x0100  // use fullbright mask palette
#define TEXPREF_NOBRIGHT                0x0200  // use nobright mask palette
#define TEXPREF_CONCHARS                0x0400  // use conchars palette
#define TEXPREF_WARPIMAGE               0x0800  // resize this texture when warpimagesize changes

enum srcformat {SRC_INDEXED, SRC_LIGHTMAP, SRC_RGBA};

typedef uintptr_t src_offset_t;

typedef struct gltexture_s
{
//managed by texture manager
	GLuint                  texnum;
	struct gltexture_s      *next;
	qmodel_t                *owner;
//managed by image loading
	char                    name[64];
	uint32_t                width; //size of image as it exists in opengl
	uint32_t                height; //size of image as it exists in opengl
	uint32_t                flags;
	char                    source_file[MAX_QPATH]; //relative filepath to data source, or "" if source is in memory
	src_offset_t            source_offset; //byte offset into file, or memory address
	enum srcformat          source_format; //format of pixel data (indexed, lightmap, or rgba)
	uint32_t                source_width; //size of image in source data
	uint32_t                source_height; //size of image in source data
	uint16_t                source_crc; //generated by source data before modifications
	int8_t                          shirt; //0-13 shirt color, or -1 if never colormapped
	int8_t                          pants; //0-13 pants color, or -1 if never colormapped
//used for rendering
	int32_t                 visframe; //matches r_framecount if texture was bound this frame
} gltexture_t;

extern gltexture_t *notexture;
extern gltexture_t *nulltexture;

extern uint32_t d_8to24table[256];
extern uint32_t d_8to24table_fbright[256];
extern uint32_t d_8to24table_nobright[256];
extern uint32_t d_8to24table_conchars[256];
extern uint32_t d_8to24table_shirt[256];
extern uint32_t d_8to24table_pants[256];

// TEXTURE MANAGER

float TexMgr_FrameUsage(void);
gltexture_t *TexMgr_FindTexture(qmodel_t *owner, const char *name);
gltexture_t *TexMgr_NewTexture(void);
void TexMgr_FreeTexture(gltexture_t *kill);
void TexMgr_FreeTextures(uint32_t flags, uint32_t mask);
void TexMgr_FreeTexturesForOwner(qmodel_t *owner);
void TexMgr_NewGame(void);
void TexMgr_Init(void);
void TexMgr_DeleteTextureObjects(void);

// IMAGE LOADING
gltexture_t *TexMgr_LoadImage(qmodel_t *owner, const char *name, int32_t width, int32_t height, enum srcformat format,
                              byte *data, const char *source_file, src_offset_t source_offset, unsigned flags);
void TexMgr_ReloadImage(gltexture_t *glt, int32_t shirt, int32_t pants);
void TexMgr_ReloadImages(void);
void TexMgr_ReloadNobrightImages(void);

int32_t TexMgr_Pad(int32_t s);
int32_t TexMgr_SafeTextureSize(int32_t s);
int32_t TexMgr_PadConditional(int32_t s);

// TEXTURE BINDING & TEXTURE UNIT SWITCHING

void GL_SelectTexture(GLenum target);
void GL_DisableMultitexture(void);  //selects texture unit 0
void GL_EnableMultitexture(void);  //selects texture unit 1
void GL_Bind(gltexture_t *texture);
void GL_ClearBindings(void);

#endif