gl_draw.c

/*
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.

*/

// draw.c -- this is the only file outside the refresh that touches the
// vid buffer

#include "../../../nzportable_def.h"

#define GL_COLOR_INDEX8_EXT     0x80E5

#pragma GCC diagnostic ignored "-Wstringop-overflow="

extern unsigned char d_15to8table[65536];

cvar_t		gl_nobind = {"gl_nobind", "0"};
cvar_t		gl_max_size = {"gl_max_size", "1024"};
cvar_t		gl_picmip = {"gl_picmip", "0"};

byte		*draw_chars;				// 8*8 graphic characters
qpic_t		*sniper_scope;

qpic_t		*draw_backtile;

int			translate_texture;
int			char_texture;

typedef struct
{
	int		texnum;
	float	sl, tl, sh, th;
} glpic_t;

byte		conback_buffer[sizeof(qpic_t) + sizeof(glpic_t)];

int		gl_lightmap_format = 4;
int		gl_solid_format = 3;
int		gl_alpha_format = 4;

int		gl_filter_min = GL_LINEAR_MIPMAP_NEAREST;
int		gl_filter_max = GL_LINEAR;


int		texels;

int GL_LoadPicTexture (qpic_t *pic);

//Loading Fill by Crow_bar
float 	loading_cur_step;
char	loading_name[32];
float 	loading_num_step;
int 	loading_step;
float 	loading_cur_step_bk;

typedef struct
{
	int		texnum;
	char	identifier[64];
	int		original_width;
	int		original_height;
	int		width, height;
	qboolean	mipmap;
	qboolean islmp;
	int 		checksum;

// Diabolicka TGA
int			bytesperpixel;
int			lhcsum;
// Diabolickal end
} gltexture_t;


#define	MAX_GLTEXTURES	1024
gltexture_t	gltextures[MAX_GLTEXTURES];
int			numgltextures;


void GL_Bind (int texnum)
{
	if (gl_nobind.value)
		texnum = char_texture;
	if (currenttexture == texnum)
		return;
	currenttexture = texnum;
	glBindTexture(GL_TEXTURE_2D, texnum);
}


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

  scrap allocation

  Allocate all the little status bar obejcts into a single texture
  to crutch up stupid hardware / drivers

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

#define	MAX_SCRAPS		2
#define	BLOCK_WIDTH		256
#define	BLOCK_HEIGHT	256

int			scrap_allocated[MAX_SCRAPS][BLOCK_WIDTH];
byte		scrap_texels[MAX_SCRAPS][BLOCK_WIDTH*BLOCK_HEIGHT*4];
qboolean	scrap_dirty;
int			scrap_texnum;

// returns a texture number and the position inside it
int Scrap_AllocBlock (int w, int h, int *x, int *y)
{
	int		i, j;
	int		best, best2;
	int		texnum;

	for (texnum=0 ; texnum<MAX_SCRAPS ; texnum++)
	{
		best = BLOCK_HEIGHT;

		for (i=0 ; i<BLOCK_WIDTH-w ; i++)
		{
			best2 = 0;

			for (j=0 ; j<w ; j++)
			{
				if (scrap_allocated[texnum][i+j] >= best)
					break;
				if (scrap_allocated[texnum][i+j] > best2)
					best2 = scrap_allocated[texnum][i+j];
			}
			if (j == w)
			{	// this is a valid spot
				*x = i;
				*y = best = best2;
			}
		}

		if (best + h > BLOCK_HEIGHT)
			continue;

		for (i=0 ; i<w ; i++)
			scrap_allocated[texnum][*x + i] = best + h;

		return texnum;
	}

	Sys_Error ("full");
	return 0; // naievil -- will never be reached only for warning removal
}

int	scrap_uploads;

void Scrap_Upload (void)
{
	int		texnum;

	scrap_uploads++;

	for (texnum=0 ; texnum<MAX_SCRAPS ; texnum++) {
		GL_Bind(scrap_texnum + texnum);
		GL_Upload8 (scrap_texels[texnum], BLOCK_WIDTH, BLOCK_HEIGHT, false, true);
	}
	scrap_dirty = false;
}

//=============================================================================
/* Support Routines */

typedef struct cachepic_s
{
	char		name[MAX_QPATH];
	qpic_t		pic;
	byte		padding[32];	// for appended glpic
} cachepic_t;

#define	MAX_CACHED_PICS		128
cachepic_t	menu_cachepics[MAX_CACHED_PICS];
int			menu_numcachepics;

byte		menuplyr_pixels[4096];

int		pic_texels;
int		pic_count;

/*
================
Draw_CachePic
================
*/
qpic_t	*Draw_CachePic (char *path)
{
	cachepic_t	*pic;
	int			i;
	qpic_t		*dat;
	glpic_t		*gl;
	char		str[128];

	strcpy (str, path);
	for (pic=menu_cachepics, i=0 ; i<menu_numcachepics ; pic++, i++)
		if (!strcmp (str, pic->name))
			return &pic->pic;

	if (menu_numcachepics == MAX_CACHED_PICS)
		Sys_Error ("menu_numcachepics == MAX_CACHED_PICS");
	menu_numcachepics++;
	strcpy (pic->name, str);

//
// load the pic from disk
//

	int index = loadtextureimage (str, 0, 0, qfalse, qfalse);
	if(index)
	{
		pic->pic.width  = gltextures[index].original_width;
		pic->pic.height = gltextures[index].original_height;

		gltextures[index].islmp = qfalse;
		gl = (glpic_t *)pic->pic.data;
		gl->texnum = index;

		return &pic->pic;
	}

	dat = (qpic_t *)COM_LoadTempFile (str);
	if (!dat)
	{
		strcat (str, ".lmp");
		dat = (qpic_t *)COM_LoadTempFile (str);
		if (!dat)
		{
			Con_Printf ("Draw_CachePic: failed to load file %s\n", str);
			return NULL;
		}
	}
	SwapPic (dat);


	pic->pic.width = dat->width;
	pic->pic.height = dat->height;

	gl = (glpic_t *)pic->pic.data;
	gl->texnum = GL_LoadPicTexture (dat);

	gltextures[gl->texnum].islmp = qtrue;
	return &pic->pic;
}

typedef struct
{
	char *name;
	int	minimize, maximize;
} glmode_t;

glmode_t modes[] = {
	{"GL_NEAREST", GL_NEAREST, GL_NEAREST},
	{"GL_LINEAR", GL_LINEAR, GL_LINEAR},
	{"GL_NEAREST_MIPMAP_NEAREST", GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST},
	{"GL_LINEAR_MIPMAP_NEAREST", GL_LINEAR_MIPMAP_NEAREST, GL_LINEAR},
	{"GL_NEAREST_MIPMAP_LINEAR", GL_NEAREST_MIPMAP_LINEAR, GL_NEAREST},
	{"GL_LINEAR_MIPMAP_LINEAR", GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR}
};

/*
===============
Draw_TextureMode_f
===============
*/
void Draw_TextureMode_f (void)
{
	int		i;
	gltexture_t	*glt;

	if (Cmd_Argc() == 1)
	{
		for (i=0 ; i< 6 ; i++)
			if (gl_filter_min == modes[i].minimize)
			{
				Con_Printf ("%s\n", modes[i].name);
				return;
			}
		Con_Printf ("current filter is unknown???\n");
		return;
	}

	for (i=0 ; i< 6 ; i++)
	{
		if (!Q_strcasecmp (modes[i].name, Cmd_Argv(1) ) )
			break;
	}
	if (i == 6)
	{
		Con_Printf ("bad filter name\n");
		return;
	}

	gl_filter_min = modes[i].minimize;
	gl_filter_max = modes[i].maximize;

	// change all the existing mipmap texture objects
	for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
	{
		if (glt->mipmap)
		{
			GL_Bind (glt->texnum);
			glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
			glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
		}
	}
}

// ! " # $ % & ' ( ) * _ , - . / 0
// 1 2 3 4 5 6 7 8 9 : ; < = > ? @
// A B C D E F G H I J K L M N O P
// Q R S T U V W X Y Z [ \ ] ^ _ `
// a b c d e f g h i j k l m n o p
// q r s t u v w x y z { | } ~
int font_kerningamount[96];

void InitKerningMap(void)
{
	// Initialize the kerning amount as 8px for each
	// char in the event we cant load the file.
	for(int i = 0; i < 96; i++) {
		font_kerningamount[i] = 8;
	}

    FILE *kerning_map = fopen(va("%s/gfx/kerning_map.txt", com_gamedir), "r");
    if (kerning_map == NULL) {
        return;
    }

    char buffer[1024];
    if (fgets(buffer, sizeof(buffer), kerning_map) != NULL) {
        char *token = strtok(buffer, ",");
        int i = 0;
        while (token != NULL && i < 96) {
            font_kerningamount[i++] = atoi(token);
            token = strtok(NULL, ",");
        }
    }

    fclose(kerning_map);
}

/*
===============
Draw_Init
===============
*/
void Draw_Init (void)
{
	int		start;

	numgltextures = 0;

	Cvar_RegisterVariable (&gl_nobind);
	Cvar_RegisterVariable (&gl_max_size);
	Cvar_RegisterVariable (&gl_picmip);

	if (!new3ds_flag) {
		//Cvar_SetValue("gl_picmip", 1);
		Cvar_Set ("gl_max_size", "256");
	}

	Cmd_AddCommand ("gl_texturemode", &Draw_TextureMode_f);

	// now turn them into textures
	char_texture = loadtextureimage ("gfx/charset", 0, 0, false, false);
	if (char_texture == 0)// did not find a matching TGA...
		Sys_Error ("Could not load charset, make sure you have every folder and file installed properly\nDouble check that all of your files are in their correct places\nAnd that you have installed the game properly.\n");

	start = Hunk_LowMark();


	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

	// free loaded console
	Hunk_FreeToLowMark(start);

	// save a texture slot for translated picture
	translate_texture = texture_extension_number++;

	// save slots for scraps
	scrap_texnum = texture_extension_number;
	texture_extension_number += MAX_SCRAPS;

	//
	// get the other pics we need
	//
	sniper_scope = Draw_CachePic ("gfx/hud/scope");

	Clear_LoadingFill ();

	InitKerningMap();
}



/*
================
Draw_Character

Draws one 8*8 graphics character with 0 being transparent.
It can be clipped to the top of the screen to allow the console to be
smoothly scrolled off.
================
*/
void Draw_Character (int x, int y, int num)
{
	int				row, col;
	float			frow, fcol, size;

	if (num == 32)
		return;		// space

	num &= 255;
	
	if (y <= -8)
		return;			// totally off screen

	row = num>>4;
	col = num&15;

	frow = row*0.0625;
	fcol = col*0.0625;
	size = 0.0625;

	GL_Bind (char_texture);

	glEnable(GL_ALPHA_TEST);
	glBegin (GL_QUADS);
	glTexCoord2f (fcol, frow);
	glVertex2f (x, y);
	glTexCoord2f (fcol + size, frow);
	glVertex2f (x+8, y);
	glTexCoord2f (fcol + size, frow + size);
	glVertex2f (x+8, y+8);
	glTexCoord2f (fcol, frow + size);
	glVertex2f (x, y+8);
	glEnd ();
	glDisable(GL_ALPHA_TEST);
}

/*
================
Draw_CharacterRGBA

This is the same as Draw_Character, but with RGBA color codes.
- Cypress
================
*/
extern cvar_t scr_coloredtext;
void Draw_CharacterRGBA(int x, int y, int num, float r, float g, float b, float a, float scale)
{
	int				row, col;
	float			frow, fcol, size;

	if (num == 32)
		return;		// space

	num &= 255;
	
	if (y <= -8)
		return;			// totally off screen

	row = num>>4;
	col = num&15;

	frow = row*0.0625f;
	fcol = col*0.0625f;
	size = 0.0625f*scale;

	GL_Bind (char_texture);

	glEnable(GL_BLEND);
	glColor4f(r/255, g/255, b/255, a/255);
	glDisable (GL_ALPHA_TEST);
	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
	glBegin (GL_QUADS);
	glTexCoord2f (fcol, frow);
	glVertex2f (x, y);
	glTexCoord2f (fcol + (float)(size/(float)scale), frow);
	glVertex2f (x+(8*(scale)), y);
	glTexCoord2f (fcol + (float)(size/(float)scale), frow + (float)(size/(float)scale));
	glVertex2f (x+(8*(scale)), y+(8*(scale)));
	glTexCoord2f (fcol, frow + (float)(size/(float)scale));
	glVertex2f (x, y+(8*(scale)));
	glEnd ();
	glColor4f(1,1,1,1);
	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
	glEnable(GL_ALPHA_TEST);
	glDisable (GL_BLEND);
}

/*
================
Draw_String
================
*/
void Draw_String (int x, int y, char *str)
{
	Draw_ColoredString(x, y, str, 255, 255, 255, 255, 1); 
}

void Draw_ColoredString(int x, int y, char *str, float r, float g, float b, float a, float scale) 
{
	while (*str)
	{
		Draw_CharacterRGBA (x, y, *str, r, g, b, a, (int)scale);

		// Hooray for variable-spacing!
		if (*str == ' ')
			x += 4 * (int)scale;
		else if ((int)*str < 33 || (int)*str > 126)
            x += 8 * (int)scale;
		else
            x += (font_kerningamount[(int)(*str - 33)] + 1) * (int)scale;
		
		str++;
	}
}

int getTextWidth(char *str, float scale)
{
	int width = 0;

    for (int i = 0; i < strlen(str); i++) {
        // Hooray for variable-spacing!
		if (str[i] == ' ')
			width += 4 * (int)scale;
		else if ((int)str[i] < 33 || (int)str[i] > 126)
            width += 8 * (int)scale;
		else
            width += (font_kerningamount[(int)(str[i] - 33)] + 1) * (int)scale;
    }

	return width;
}


void Draw_ColoredStringCentered(int y, char *str, float r, float g, float b, float a, float scale)
{
	Draw_ColoredString((vid.width - getTextWidth(str, scale))/2, y, str, r, g, b, a, scale);
}

/*
================
Draw_DebugChar

Draws a single character directly to the upper right corner of the screen.
This is for debugging lockups by drawing different chars in different parts
of the code.
================
*/
void Draw_DebugChar (char num)
{
}

/*
=============
Draw_AlphaPic
=============
*/
void Draw_AlphaPic (int x, int y, qpic_t *pic, float alpha)
{
	Draw_ColorPic(x, y, pic, 255, 255, 255, alpha);
}


/*
=============
Draw_Pic
=============
*/
void Draw_Pic (int x, int y, qpic_t *pic)
{
	Draw_ColorPic(x, y, pic, 255, 255, 255, 255);
}

/*
=============
Draw_ColoredStretchPic
=============
*/
void Draw_ColoredStretchPic (int x, int y, qpic_t *pic, int x_value, int y_value, int r, int g, int b, int a)
{
	glpic_t			*gl;

	if (scrap_dirty)
		Scrap_Upload ();
	gl = (glpic_t *)pic->data;

	glEnable(GL_BLEND);
	glDisable(GL_ALPHA_TEST);
	glColor4f(r/255.0,g/255.0,b/255.0,a/255.0);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

	GL_Bind (gl->texnum);
	glBegin (GL_QUADS);
	glTexCoord2f (0, 0);
	glVertex2f (x, y);
	glTexCoord2f (1, 0);
	glVertex2f (x+x_value, y);
	glTexCoord2f (1, 1);
	glVertex2f (x+x_value, y+y_value);
	glTexCoord2f (0, 1);
	glVertex2f (x, y+y_value);
	glEnd ();

	glColor4f(1,1,1,1);
}

/*
=============
Draw_StretchPic
=============
*/
void Draw_StretchPic (int x, int y, qpic_t *pic, int x_value, int y_value)
{
	glpic_t			*gl;

	if (scrap_dirty)
		Scrap_Upload ();
	gl = (glpic_t *)pic->data;


	glEnable(GL_ALPHA_TEST);
	glColor4f(1,1,1,1);

	GL_Bind (gl->texnum);
	glBegin (GL_QUADS);
	glTexCoord2f (0, 0);
	glVertex2f (x, y);
	glTexCoord2f (1, 0);
	glVertex2f (x+x_value, y);
	glTexCoord2f (1, 1);
	glVertex2f (x+x_value, y+y_value);
	glTexCoord2f (0, 1);
	glVertex2f (x, y+y_value);
	glEnd ();

	glColor4f(1,1,1,1);
}

/*
=============
Draw_ColorPic
=============
*/
void Draw_ColorPic (int x, int y, qpic_t *pic, float r, float g , float b, float a)
{
	glpic_t			*gl;

	if (scrap_dirty)
		Scrap_Upload ();
	gl = (glpic_t *)pic->data;

	glDisable(GL_ALPHA_TEST);
	glEnable(GL_BLEND);
	glColor4f(r/255.0f,g/255.0f,b/255.0f,a/255.0f);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
	GL_Bind (gl->texnum);

	glBegin (GL_QUADS);
	glTexCoord2f (0, 0);
	glVertex2f (x, y);
	glTexCoord2f (1, 0);
	glVertex2f (x+pic->width, y);
	glTexCoord2f (1, 1);
	glVertex2f (x+pic->width, y+pic->height);
	glTexCoord2f (0, 1);
	glVertex2f (x, y+pic->height);
	glEnd ();

	glDisable(GL_BLEND);
	//glDisable(GL_ALPHA_TEST);
	glColor4f(1,1,1,1);
}

/*
=============
Draw_TransPic
=============
*/
void Draw_TransPic (int x, int y, qpic_t *pic)
{
	if (x < 0 || (unsigned)(x + pic->width) > vid.width || y < 0 ||
		 (unsigned)(y + pic->height) > vid.height)
	{
		Sys_Error ("bad coordinates");
	}
		
	Draw_Pic (x, y, pic);
}


/*
=============
Draw_TransPicTranslate

Only used for the player color selection menu
=============
*/
void Draw_TransPicTranslate (int x, int y, qpic_t *pic, byte *translation)
{
	int				v, u;
	unsigned		trans[64*64], *dest;
	byte			*src;
	int				p;

	GL_Bind (translate_texture);

	dest = trans;
	for (v=0 ; v<64 ; v++, dest += 64)
	{
		src = &menuplyr_pixels[ ((v*pic->height)>>6) *pic->width];
		for (u=0 ; u<64 ; u++)
		{
			p = src[(u*pic->width)>>6];
			if (p == 255)
				dest[u] = p;
			else
				dest[u] =  d_8to24table[translation[p]];
		}
	}

	glTexImage2D (GL_TEXTURE_2D, 0, gl_alpha_format, 64, 64, 0, GL_RGBA, GL_UNSIGNED_BYTE, trans);

	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

	glColor3f (1,1,1);
	glBegin (GL_QUADS);
	glTexCoord2f (0, 0);
	glVertex2f (x, y);
	glTexCoord2f (1, 0);
	glVertex2f (x+pic->width, y);
	glTexCoord2f (1, 1);
	glVertex2f (x+pic->width, y+pic->height);
	glTexCoord2f (0, 1);
	glVertex2f (x, y+pic->height);
	glEnd ();
}


/*
================
Draw_ConsoleBackground

================
*/
void Draw_ConsoleBackground (int lines)
{
	Draw_FillByColor(0, 0, vid.width, lines, 0, 0, 0, 255);
}


/*
=============
Draw_TileClear

This repeats a 64*64 tile graphic to fill the screen around a sized down
refresh window.
=============
*/
void Draw_TileClear (int x, int y, int w, int h)
{
	glColor3f (1,1,1);
	GL_Bind (*(int *)draw_backtile->data);
	glBegin (GL_QUADS);
	glTexCoord2f (x/64.0, y/64.0);
	glVertex2f (x, y);
	glTexCoord2f ( (x+w)/64.0, y/64.0);
	glVertex2f (x+w, y);
	glTexCoord2f ( (x+w)/64.0, (y+h)/64.0);
	glVertex2f (x+w, y+h);
	glTexCoord2f ( x/64.0, (y+h)/64.0 );
	glVertex2f (x, y+h);
	glEnd ();
}

/*
================
Draw_LoadingFill
By Crow_bar
================
*/
void Draw_LoadingFill(void)
{
    if(!loading_num_step)
		return;

	int size       	= 8;
	int max_step   	= 350;
    int x          	= (vid.width  / 2) - (max_step / 2);
    int y          	= vid.height - (size/ 2) - 25;
	char* text;


	if(loading_cur_step > loading_num_step)
	      loading_cur_step = loading_num_step;

	if (loading_cur_step < loading_cur_step_bk)
		loading_cur_step = loading_cur_step_bk;

	if (loading_cur_step == loading_num_step && loading_cur_step_bk != loading_num_step)
		loading_cur_step = loading_cur_step_bk;

    float loadsize = loading_cur_step * (max_step / loading_num_step);
	Draw_FillByColor (x - 2, y - 2, max_step + 4, size + 4, 69, 69, 69, 255);
	Draw_FillByColor (x, y, (int)loadsize, size, 0, 0, 0, 200);

	switch(loading_step) {
		case 1: text = "Loading Models.."; break;
		case 2: text = "Loading World.."; break;
		case 3: text = "Running Test Frame.."; break;
		case 4: text = "Loading Sounds.."; break;
		default: text = "Initializing.."; break;
	}
	
	Draw_ColoredStringCentered(y, text, 255, 255, 255, 255, 1);

	loading_cur_step_bk = loading_cur_step;
}

void Clear_LoadingFill (void)
{
    //it is end loading
	loading_cur_step = 0;
	loading_cur_step_bk = 0;
	loading_num_step = 0;
	loading_step = -1;
	memset(loading_name, 0, sizeof(loading_name));
}

/*
=============
Draw_FillByColor

Fills a box of pixels with a single color
=============
*/
void Draw_FillByColor (int x, int y, int w, int h, int r, int g, int b, int a)
{
	glDisable (GL_TEXTURE_2D);
	glEnable (GL_BLEND); //johnfitz -- for alpha
	glDisable (GL_ALPHA_TEST); //johnfitz -- for alpha
	glColor4f ((float)(r/255.0f), (float)(g/255.0f), (float)(b/255.0f), (float)(a/255.0f));

	glBegin (GL_QUADS);

	glVertex2f (x,y);
	glVertex2f (x+w, y);
	glVertex2f (x+w, y+h);
	glVertex2f (x, y+h);

	glEnd ();
	glColor4f (1,1,1,1);
	glDisable (GL_BLEND); //johnfitz -- for alpha
	glEnable(GL_ALPHA_TEST); //johnfitz -- for alpha
	glEnable (GL_TEXTURE_2D);
}
//=============================================================================

/*
=============
Batch_FillByColor

Fills a box of pixels with a single color (batched variant)
=============
*/
static qboolean is_batching_fill = qfalse;
void Batch_FillByColor (int x, int y, int w, int h, int r, int g, int b, int a)
{
	if (!is_batching_fill) {
		is_batching_fill = qtrue;
		glDisable (GL_TEXTURE_2D);
		glEnable (GL_BLEND); //johnfitz -- for alpha
		glDisable (GL_ALPHA_TEST); //johnfitz -- for alpha
		glColor4f ((float)(r/255.0f), (float)(g/255.0f), (float)(b/255.0f), (float)(a/255.0f));
		glBegin (GL_QUADS);
	}

	glVertex2f (x,y);
	glVertex2f (x+w, y);
	glVertex2f (x+w, y+h);
	glVertex2f (x, y+h);
}

void Draw_BatchedFill() {
	if (is_batching_fill) {
		glEnd ();
		glColor4f (1,1,1,1);
		glDisable (GL_BLEND); //johnfitz -- for alpha
		glEnable(GL_ALPHA_TEST); //johnfitz -- for alpha
		glEnable (GL_TEXTURE_2D);
		is_batching_fill = qfalse;
	}
}

byte *StringToRGB (char *s)
{
	byte		*col;
	static	byte	rgb[4];

	Cmd_TokenizeString (s);
	if (Cmd_Argc() == 3)
	{
		rgb[0] = (byte)Q_atoi(Cmd_Argv(0));
		rgb[1] = (byte)Q_atoi(Cmd_Argv(1));
		rgb[2] = (byte)Q_atoi(Cmd_Argv(2));
	}
	else
	{
		col = (byte *)&d_8to24table[(byte)Q_atoi(s)];
		rgb[0] = col[0];
		rgb[1] = col[1];
		rgb[2] = col[2];
	}
	rgb[3] = 255;

	return rgb;
}

extern cvar_t crosshair;
extern qboolean croshhairmoving;
//extern cvar_t cl_zoom;
extern qpic_t *hitmark;
double Hitmark_Time, crosshair_spread_time;
float cur_spread;
float crosshair_offset_step;

int CrossHairWeapon (void)
{
    int i;
	switch(cl.stats[STAT_ACTIVEWEAPON])
	{
		case W_COLT:
		case W_BIATCH:
		case W_357:
		case W_KILLU:
			i = 22;
			break;
		case W_PTRS:
		case W_PENETRATOR:
		case W_KAR_SCOPE:
		case W_HEADCRACKER:
		case W_KAR:
		case W_ARMAGEDDON:
		case W_SPRING:
		case W_PULVERIZER:
			i = 65;
			break;
		case W_MP40:
		case W_AFTERBURNER:
		case W_STG:
		case W_SPATZ:
		case W_THOMPSON:
		case W_GIBS:
		case W_BAR:
		case W_WIDOW:
		case W_PPSH:
		case W_REAPER:
		case W_RAY:
		case W_PORTER:
		case W_TYPE:
		case W_SAMURAI:
		case W_FG:
		case W_IMPELLER:
		case W_MP5:
		case W_KOLLIDER:
			i = 10;
			break;
		case W_BROWNING:
		case W_ACCELERATOR:
		case W_MG:
		case W_BARRACUDA:
			i = 30;
			break;
		case W_SAWNOFF:
		case W_SNUFF:
			i = 50;
			break;
		case W_TRENCH:
		case W_GUT:
		case W_DB:
		case W_BORE:
			i = 35;
			break;
		case W_GEWEHR:
		case W_COMPRESSOR:
		case W_M1:
		case W_M1000:
		case W_M1A1:
		case W_WIDDER:
			i = 5;
			break;
		case W_PANZER:
		case W_LONGINUS:
		case W_TESLA:
			i = 0;
			break;
		default:
			i = 0;
			break;
	}

	i *= 0.68;
	i += 6;

    if (cl.perks & 64)
        i *= 0.75;

    return i;
}
int CrossHairMaxSpread (void)
{
	int i;
	switch(cl.stats[STAT_ACTIVEWEAPON])
	{
		case W_COLT:
		case W_BIATCH:
		case W_STG:
		case W_SPATZ:
		case W_MP40:
		case W_AFTERBURNER:
		case W_THOMPSON:
		case W_GIBS:
		case W_BAR:
		case W_WIDOW:
		case W_357:
		case W_KILLU:
		case W_BROWNING:
		case W_ACCELERATOR:
		case W_FG:
		case W_IMPELLER:
		case W_MP5:
		case W_KOLLIDER:
		case W_MG:
		case W_BARRACUDA:
		case W_PPSH:
		case W_REAPER:
		case W_RAY:
		case W_PORTER:
		case W_TYPE:
		case W_SAMURAI:
			i = 48;
			break;
		case W_PTRS:
		case W_PENETRATOR:
		case W_KAR_SCOPE:
		case W_HEADCRACKER:
		case W_KAR:
		case W_ARMAGEDDON:
		case W_SPRING:
		case W_PULVERIZER:
			i = 75;
			break;
		case W_SAWNOFF:
		case W_SNUFF:
			i = 50;
			break;
		case W_DB:
		case W_BORE:
		case W_TRENCH:
		case W_GUT:
		case W_GEWEHR:
		case W_COMPRESSOR:
		case W_M1:
		case W_M1000:
		case W_M1A1:
		case W_WIDDER:
			i = 35;
			break;
		case W_PANZER:
		case W_LONGINUS:
		case W_TESLA:
			i = 0;
			break;
		default:
			i = 0;
			break;
	}

	i *= 0.68;
	i += 6;

    if (cl.perks & 64)
        i *= 0.75;

    return i;
}

/*
================
Draw_Crosshair
================
*/

extern float crosshair_opacity;
extern cvar_t cl_crosshair_debug;
extern qboolean crosshair_pulse_grenade;
void Draw_Crosshair (void)
{	
	if (cl_crosshair_debug.value) {
		Draw_FillByColor(vid.width/2, 0, 1, 240, 255, 0, 0, 255);
		Draw_FillByColor(0, vid.height/2, 400, 1, 0, 255, 0, 255);
	}

	if (cl.stats[STAT_HEALTH] <= 20)
		return;

	if (cl.stats[STAT_ZOOM] == 2)
		Draw_Pic (-39, -15, sniper_scope);
   	if (Hitmark_Time > sv.time)
        Draw_Pic ((vid.width - hitmark->width)/2,(vid.height - hitmark->height)/2, hitmark);

	// Make sure to do this after hitmark drawing.
	if (cl.stats[STAT_ZOOM] == 2 || cl.stats[STAT_ZOOM] == 1)
		return;

	if (!crosshair_opacity)
		crosshair_opacity = 255;

	float col;

	if (sv_player->v.facingenemy == 1) {
		col = 0;
	} else {
		col = 255;
	}

	// crosshair moving
	if (crosshair_spread_time > sv.time && crosshair_spread_time)
    {
        cur_spread = cur_spread + 10;
		crosshair_opacity = 128;

		if (cur_spread >= CrossHairMaxSpread())
			cur_spread = CrossHairMaxSpread();
    }
	// crosshair not moving
	else if (crosshair_spread_time < sv.time && crosshair_spread_time)
    {
        cur_spread = cur_spread - 4;
		crosshair_opacity = 255;

		if (cur_spread <= 0) {
			cur_spread = 0;
			crosshair_spread_time = 0;
		}
    }

	int x_value, y_value;
    int crosshair_offset;

	// Standard crosshair (+)
	if (crosshair.value == 1) {
		crosshair_offset = CrossHairWeapon() + cur_spread;
		if (CrossHairMaxSpread() < crosshair_offset || croshhairmoving)
			crosshair_offset = CrossHairMaxSpread();

		if (sv_player->v.view_ofs[2] == 8) {
			crosshair_offset *= 0.80f;
		} else if (sv_player->v.view_ofs[2] == -10) {
			crosshair_offset *= 0.65f;
		}

		crosshair_offset_step += (crosshair_offset - crosshair_offset_step) * 0.5f;

		x_value = (vid.width - 3)/2.0f - crosshair_offset_step;
		y_value = (vid.height - 1)/2.0f;
		Batch_FillByColor(x_value, y_value, 3, 1, 255, (int)col, (int)col, (int)crosshair_opacity);

		x_value = (vid.width - 3)/2.0f + crosshair_offset_step;
		y_value = (vid.height - 1)/2.0f;
		Batch_FillByColor(x_value, y_value, 3, 1, 255, (int)col, (int)col, (int)crosshair_opacity);

		x_value = (vid.width - 1)/2.0f;
		y_value = (vid.height - 3)/2.0f - crosshair_offset_step;
		Batch_FillByColor(x_value, y_value, 1, 3, 255, (int)col, (int)col, (int)crosshair_opacity);

		x_value = (vid.width - 1)/2.0f;
		y_value = (vid.height - 3)/2.0f + crosshair_offset_step;
		Batch_FillByColor(x_value, y_value, 1, 3, 255, (int)col, (int)col, (int)crosshair_opacity);
		
		Draw_BatchedFill();
	}
	// Area of Effect (o)
	else if (crosshair.value == 2) {
		Draw_CharacterRGBA((vid.width)/2-4, (vid.height)/2, 'O', 255, (int)col, (int)col, (int)crosshair_opacity, 1);
	}
	// Dot crosshair (.)
	else if (crosshair.value == 3) {
		Draw_CharacterRGBA((vid.width - 8)/2, (vid.height - 8)/2, '.', 255, (int)col, (int)col, (int)crosshair_opacity, 1);
	}
	// Grenade crosshair
	else if (crosshair.value == 4) {
		if (crosshair_pulse_grenade) {
			crosshair_offset_step = 0;
			cur_spread = 2;
		}

		crosshair_pulse_grenade = false;

		crosshair_offset = 12 + cur_spread;
		crosshair_offset_step += (crosshair_offset - crosshair_offset_step) * 0.5f;

		x_value = (vid.width - 3)/2.0f - crosshair_offset_step;
		y_value = (vid.height - 1)/2.0f;
		Batch_FillByColor(x_value, y_value, 3, 1, 255, 255, 255, 255);

		x_value = (vid.width - 3)/2.0f + crosshair_offset_step;
		y_value = (vid.height - 1)/2.0f;
		Batch_FillByColor(x_value, y_value, 3, 1, 255, 255, 255, 255);

		x_value = (vid.width - 1)/2.0f;
		y_value = (vid.height - 3)/2.0f - crosshair_offset_step;
		Batch_FillByColor(x_value, y_value, 1, 3, 255, 255, 255, 255);

		x_value = (vid.width - 1)/2.0f;
		y_value = (vid.height - 3)/2.0f + crosshair_offset_step;
		Batch_FillByColor(x_value, y_value, 1, 3, 255, 255, 255, 255);
		
		Draw_BatchedFill();
	}
}


/*
================
Draw_FadeScreen

================
*/
void Draw_FadeScreen (void)
{
	glEnable (GL_BLEND);
	glDisable (GL_TEXTURE_2D);
	glColor4f (0, 0, 0, 0.8);
	glBegin (GL_QUADS);

	glVertex2f (0,0);
	glVertex2f (vid.width, 0);
	glVertex2f (vid.width, vid.height);
	glVertex2f (0, vid.height);

	glEnd ();
	glColor4f (1,1,1,1);
	glEnable (GL_TEXTURE_2D);
	glDisable (GL_BLEND);
}

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

/*
================
GL_Set2D

Setup as if the screen was 320*200
================
*/
void GL_Set2D (void)
{
	glViewport (glx, gly, glwidth, glheight);

	glMatrixMode(GL_PROJECTION);
    glLoadIdentity ();
	glOrtho  (0, vid.width, vid.height, 0, -99999, 99999);

	glMatrixMode(GL_MODELVIEW);
    glLoadIdentity ();

	glDisable (GL_DEPTH_TEST);
	glDisable (GL_CULL_FACE);
	glDisable (GL_BLEND);
	//glEnable (GL_ALPHA_TEST);
	//glDisable (GL_ALPHA_TEST);

	glColor4f (1,1,1,1);
}

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

/*
================
GL_FindTexture
================
*/
int GL_FindTexture (char *identifier)
{
	int		i;
	gltexture_t	*glt;

	for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
	{
		if (!strcmp (identifier, glt->identifier))
			return gltextures[i].texnum;
	}

	return -1;
}

/*
================
GL_ResampleTexture
================
*/
void GL_ResampleTexture (unsigned *in, int inwidth, int inheight, unsigned *out,  int outwidth, int outheight)
{
	int		i, j;
	unsigned	*inrow;
	unsigned	frac, fracstep;

	fracstep = inwidth*0x10000/outwidth;
	for (i=0 ; i<outheight ; i++, out += outwidth)
	{
		inrow = in + inwidth*(i*inheight/outheight);
		frac = fracstep >> 1;
		for (j=0 ; j<outwidth ; j+=4)
		{
			out[j] = inrow[frac>>16];
			frac += fracstep;
			out[j+1] = inrow[frac>>16];
			frac += fracstep;
			out[j+2] = inrow[frac>>16];
			frac += fracstep;
			out[j+3] = inrow[frac>>16];
			frac += fracstep;
		}
	}
}

/*
================
GL_Resample8BitTexture -- JACK
================
*/
void GL_Resample8BitTexture (unsigned char *in, int inwidth, int inheight, unsigned char *out,  int outwidth, int outheight)
{
	int		i, j;
	unsigned	char *inrow;
	unsigned	frac, fracstep;

	fracstep = inwidth*0x10000/outwidth;
	for (i=0 ; i<outheight ; i++, out += outwidth)
	{
		inrow = in + inwidth*(i*inheight/outheight);
		frac = fracstep >> 1;
		for (j=0 ; j<outwidth ; j+=4)
		{
			out[j] = inrow[frac>>16];
			frac += fracstep;
			out[j+1] = inrow[frac>>16];
			frac += fracstep;
			out[j+2] = inrow[frac>>16];
			frac += fracstep;
			out[j+3] = inrow[frac>>16];
			frac += fracstep;
		}
	}
}


/*
================
GL_MipMap

Operates in place, quartering the size of the texture
================
*/
void GL_MipMap (byte *in, int width, int height)
{
	int		i, j;
	byte	*out;

	width <<=2;
	height >>= 1;
	out = in;
	for (i=0 ; i<height ; i++, in+=width)
	{
		for (j=0 ; j<width ; j+=8, out+=4, in+=8)
		{
			out[0] = (in[0] + in[4] + in[width+0] + in[width+4])>>2;
			out[1] = (in[1] + in[5] + in[width+1] + in[width+5])>>2;
			out[2] = (in[2] + in[6] + in[width+2] + in[width+6])>>2;
			out[3] = (in[3] + in[7] + in[width+3] + in[width+7])>>2;
		}
	}
}

/*
================
GL_MipMap8Bit

Mipping for 8 bit textures
================
*/
void GL_MipMap8Bit (byte *in, int width, int height)
{
	int		i, j;
	unsigned short     r,g,b;
	byte	*out, *at1, *at2, *at3, *at4;

//	width <<=2;
	height >>= 1;
	out = in;
	for (i=0 ; i<height ; i++, in+=width)
	{
		for (j=0 ; j<width ; j+=2, out+=1, in+=2)
		{
			at1 = (byte *) (d_8to24table + in[0]);
			at2 = (byte *) (d_8to24table + in[1]);
			at3 = (byte *) (d_8to24table + in[width+0]);
			at4 = (byte *) (d_8to24table + in[width+1]);

 			r = (at1[0]+at2[0]+at3[0]+at4[0]); r>>=5;
 			g = (at1[1]+at2[1]+at3[1]+at4[1]); g>>=5;
 			b = (at1[2]+at2[2]+at3[2]+at4[2]); b>>=5;

			out[0] = d_15to8table[(r<<0) + (g<<5) + (b<<10)];
		}
	}
}

/*
===============
GL_Upload32
===============
*/
void GL_Upload32 (unsigned *data, int width, int height,  qboolean mipmap, qboolean alpha)
{
	int			samples;
static	unsigned	scaled[1024*512];	// [512*256];
	int			scaled_width, scaled_height;

	for (scaled_width = 1 ; scaled_width < width ; scaled_width<<=1)
		;
	for (scaled_height = 1 ; scaled_height < height ; scaled_height<<=1)
		;

	scaled_width >>= (int)gl_picmip.value;
	scaled_height >>= (int)gl_picmip.value;

	if (scaled_width > gl_max_size.value)
		scaled_width = gl_max_size.value;
	if (scaled_height > gl_max_size.value)
		scaled_height = gl_max_size.value;

	if (scaled_width * scaled_height > sizeof(scaled)/4)
		Sys_Error ("too big");

	samples = alpha ? gl_alpha_format : gl_solid_format;

	texels += scaled_width * scaled_height;

	if (scaled_width == width && scaled_height == height)
	{
		if (!mipmap)
		{
			glTexImage2D (GL_TEXTURE_2D, 0, samples, scaled_width, scaled_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
			goto done;
		}
		memcpy (scaled, data, width*height*4);
	}
	else
		GL_ResampleTexture (data, width, height, scaled, scaled_width, scaled_height);

	glTexImage2D (GL_TEXTURE_2D, 0, samples, scaled_width, scaled_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, scaled);
	if (mipmap)
	{
		int		miplevel;

		miplevel = 0;
		while (scaled_width > 1 || scaled_height > 1)
		{
			GL_MipMap ((byte *)scaled, scaled_width, scaled_height);
			scaled_width >>= 1;
			scaled_height >>= 1;
			if (scaled_width < 1)
				scaled_width = 1;
			if (scaled_height < 1)
				scaled_height = 1;
			miplevel++;
			glTexImage2D (GL_TEXTURE_2D, miplevel, samples, scaled_width, scaled_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, scaled);
		}
	}
done: ;

	if (mipmap)
	{
		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
	}
	else
	{
		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_max);
		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
	}
}

void GL_Upload8_EXT (byte *data, int width, int height,  qboolean mipmap, qboolean alpha) 
{
	int			i, s;
	qboolean	noalpha;
    unsigned char scaled[1024*512];	// [512*256];
	int			scaled_width, scaled_height;

	s = width*height;
	// if there are no transparent pixels, make it a 3 component
	// texture even if it was specified as otherwise
	if (alpha)
	{
		noalpha = true;
		for (i=0 ; i<s ; i++)
		{
			if (data[i] == 255)
				noalpha = false;
		}

		if (alpha && noalpha)
			alpha = false;
	}
	for (scaled_width = 1 ; scaled_width < width ; scaled_width<<=1)
		;
	for (scaled_height = 1 ; scaled_height < height ; scaled_height<<=1)
		;

	scaled_width >>= (int)gl_picmip.value;
	scaled_height >>= (int)gl_picmip.value;

	if (scaled_width > gl_max_size.value)
		scaled_width = gl_max_size.value;
	if (scaled_height > gl_max_size.value)
		scaled_height = gl_max_size.value;

	if (scaled_width * scaled_height > sizeof(scaled))
		Sys_Error ("too big");

	texels += scaled_width * scaled_height;

	if (scaled_width == width && scaled_height == height)
	{
		if (!mipmap)
		{
			glTexImage2D (GL_TEXTURE_2D, 0, GL_COLOR_INDEX8_EXT, scaled_width, scaled_height, 0, GL_COLOR_INDEX , GL_UNSIGNED_BYTE, data);
			goto done;
		}
		memcpy (scaled, data, width*height);
	}
	else
		GL_Resample8BitTexture (data, width, height, scaled, scaled_width, scaled_height);

	glTexImage2D (GL_TEXTURE_2D, 0, GL_COLOR_INDEX8_EXT, scaled_width, scaled_height, 0, GL_COLOR_INDEX, GL_UNSIGNED_BYTE, scaled);
	if (mipmap)
	{
		int		miplevel;

		miplevel = 0;
		while (scaled_width > 1 || scaled_height > 1)
		{
			GL_MipMap8Bit ((byte *)scaled, scaled_width, scaled_height);
			scaled_width >>= 1;
			scaled_height >>= 1;
			if (scaled_width < 1)
				scaled_width = 1;
			if (scaled_height < 1)
				scaled_height = 1;
			miplevel++;
			glTexImage2D (GL_TEXTURE_2D, miplevel, GL_COLOR_INDEX8_EXT, scaled_width, scaled_height, 0, GL_COLOR_INDEX, GL_UNSIGNED_BYTE, scaled);
		}
	}
done: ;


	if (mipmap)
	{
		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
	}
	else
	{
		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_max);
		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
	}
}

/*
===============
GL_Upload8
===============
*/
void GL_Upload8 (byte *data, int width, int height,  qboolean mipmap, qboolean alpha)
{
static	unsigned	trans[640*480];		// FIXME, temporary
	int			i, s;
	qboolean	noalpha;
	int			p;

	s = width*height;
	// if there are no transparent pixels, make it a 3 component
	// texture even if it was specified as otherwise
	if (alpha)
	{
		noalpha = true;
		for (i=0 ; i<s ; i++)
		{
			p = data[i];
			if (p == 255)
				noalpha = false;
			trans[i] = d_8to24table[p];
		}

		if (alpha && noalpha)
			alpha = false;
	}
	else
	{
		if (s&3)
			Sys_Error ("s&3");
		for (i=0 ; i<s ; i+=4)
		{
			trans[i] = d_8to24table[data[i]];
			trans[i+1] = d_8to24table[data[i+1]];
			trans[i+2] = d_8to24table[data[i+2]];
			trans[i+3] = d_8to24table[data[i+3]];
		}
	}

 	if (VID_Is8bit() && !alpha && (data!=scrap_texels[0])) {
 		GL_Upload8_EXT (data, width, height, mipmap, alpha);
 		return;
	}
	GL_Upload32 (trans, width, height, mipmap, alpha);
}

//Diabolickal TGA Begin

int lhcsumtable[256];
int GL_LoadTexture (char *identifier, int width, int height, byte *data, qboolean mipmap, qboolean alpha, int bytesperpixel)
{
	int			i, s, lhcsum;
	gltexture_t	*glt;
	// occurances. well this isn't exactly a checksum, it's better than that but
	// not following any standards.
	lhcsum = 0;
	s = width*height*bytesperpixel;

	for (i = 0;i < 256;i++) lhcsumtable[i] = i + 1;
	for (i = 0;i < s;i++) lhcsum += (lhcsumtable[data[i] & 255]++);
	// see if the texture is allready present
	if (identifier[0])
	{
		for (i=0, glt=gltextures ; i < numgltextures ; i++, glt++)
		{
			if (!strcmp (identifier, glt->identifier))
			{
				if (lhcsum != glt->lhcsum || width != glt->width || height != glt->height)
				{
					Con_DPrintf("GL_LoadTexture: cache mismatch\n");
					Con_DPrintf("lhcsum: %d - %d\twidth: %d - %d\theight: %d - %d\n", lhcsum, glt->lhcsum, width, glt->width, height, glt->height);
					goto GL_LoadTexture_setup;
				}
				return glt->texnum;
			}
		}
	}

	// whoever at id or threewave must've been half asleep...
	GL_LoadTexture_setup:
	glt = &gltextures[numgltextures];
	numgltextures++;
	glt->texnum = texture_extension_number;
	texture_extension_number++;
	strcpy (gltextures[glt->texnum].identifier, identifier);


	// naievil -- why do we have this twice lol
	gltextures[glt->texnum].checksum = lhcsum;
	//gltextures[glt->texnum].lhcsum = lhcsum;

	gltextures[glt->texnum].width = width;
	gltextures[glt->texnum].height = height;
	gltextures[glt->texnum].original_width	= width;
	gltextures[glt->texnum].original_height = height;
	gltextures[glt->texnum].mipmap = mipmap;
	gltextures[glt->texnum].bytesperpixel = bytesperpixel;

	if (!isDedicated)
	{
		GL_Bind(glt->texnum);
		if (bytesperpixel == 1) {
			GL_Upload8 (data, width, height, mipmap, alpha);
		}
		else if (bytesperpixel == 4) {
			GL_Upload32 ((unsigned*)data, width, height, mipmap, true);
		}
		else {
			Sys_Error("unknown bytesperpixel\n");
		}
		glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
	}
	return glt->texnum;
}

//Diabolickal TGA End

/****************************************/

/*
================
GL_LoadTexture32
================
*/
extern byte      vid_gamma_table[256];

int GL_LoadTexture32 (char *identifier, int width, int height, byte *data, qboolean mipmap, qboolean alpha)
{
	int         i;
	gltexture_t   *glt;
	int image_size = width * height;

	// see if the texture is already present
	if (identifier[0])
	{
		for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
		{
			if (!strcmp (identifier, glt->identifier))
			{
				if (width != glt->width || height != glt->height) {
					// naievil -- fixme: 	this means we have a memory leak somewhere, was sys_error
					// 						OR that two different people used the same texture name
					//						which is actually possible
					Con_Printf("GL_LoadTexture: cache mismatch for %s\n", identifier);
					break;
				}
				return gltextures[i].texnum;
			}
		}
	}
	else {
		glt = &gltextures[numgltextures];
		numgltextures++;
	}

	strcpy (glt->identifier, identifier);
	glt->texnum = texture_extension_number;

	gltextures[glt->texnum].width = width;
	gltextures[glt->texnum].height = height;
	gltextures[glt->texnum].original_width	= width;
	gltextures[glt->texnum].original_height = height;
	gltextures[glt->texnum].mipmap = mipmap;
	gltextures[glt->texnum].bytesperpixel = 4;

	GL_Bind(texture_extension_number );

	for (i = 0; i < image_size; i++){
		data[4 * i] = gammatable[data[4 * i]];
		data[4 * i + 1] = gammatable[data[4 * i + 1]];
		data[4 * i + 2] = gammatable[data[4 * i + 2]];
	}

	GL_Upload32 ((unsigned *)data, width, height, mipmap, alpha);

	texture_extension_number++;

	return texture_extension_number-1;
}

//Diabolickal End

/*
================
GL_LoadPicTexture
================
*/
int GL_LoadPicTexture (qpic_t *pic)
{
	return GL_LoadTexture ("", pic->width, pic->height, pic->data, false, true, 1);
}

/****************************************/

static GLenum oldtarget = 0;

float gVertexBuffer[VERTEXARRAYSIZE];
float gColorBuffer[VERTEXARRAYSIZE];
float gTexCoordBuffer[VERTEXARRAYSIZE];

void GL_SelectTexture (GLenum target) 
{
	if (!gl_mtexable)
		return;
	qglSelectTextureSGIS(target);
	if (target == oldtarget) 
		return;
	cnttextures[oldtarget-TEXTURE0_SGIS] = currenttexture;
	currenttexture = cnttextures[target-TEXTURE0_SGIS];
	oldtarget = target;
}



//Diabolickal TGA Begin
int		image_width;
int		image_height;
#define	IMAGE_MAX_DIMENSIONS	512

/*
=================================================================
  PCX Loading
=================================================================
*/

typedef struct
{
    char	manufacturer;
    char	version;
    char	encoding;
    char	bits_per_pixel;
    unsigned short	xmin,ymin,xmax,ymax;
    unsigned short	hres,vres;
    unsigned char	palette[48];
    char	reserved;
    char	color_planes;
    unsigned short	bytes_per_line;
    unsigned short	palette_type;
    char	filler[58];
    unsigned 	data;			// unbounded
} pcx_t;

/*
============
LoadPCX
============
*/
byte* LoadPCX (FILE *f, int matchwidth, int matchheight)
{
	pcx_t	*pcx, pcxbuf;
	byte	palette[768];
	byte	*pix, *image_rgba;
	int		x, y;
	int		dataByte, runLength;
	int		count;

//
// parse the PCX file
//
	fread (&pcxbuf, 1, sizeof(pcxbuf), f);
	pcx = &pcxbuf;

	if (pcx->manufacturer != 0x0a
		|| pcx->version != 5
		|| pcx->encoding != 1
		|| pcx->bits_per_pixel != 8
		|| pcx->xmax >= 514
		|| pcx->ymax >= 514)
	{
		Con_Printf ("Bad pcx file\n");
		return NULL;
	}
	if (matchwidth && (pcx->xmax+1) != matchwidth)
		return NULL;
	if (matchheight && (pcx->ymax+1) != matchheight)
		return NULL;
	// seek to palette
	fseek (f, -768, SEEK_END);
	fread (palette, 1, 768, f);
	fseek (f, sizeof(pcxbuf) - 4, SEEK_SET);
	count = (pcx->xmax+1) * (pcx->ymax+1);
	image_rgba = (byte*)malloc( count * 4);

	for (y=0 ; y<=pcx->ymax ; y++)
	{
		pix = image_rgba + 4*y*(pcx->xmax+1);
		for (x=0 ; x<=pcx->xmax ; ) // muff - fixed - was referencing ymax
		{
			dataByte = fgetc(f);
			if((dataByte & 0xC0) == 0xC0)
			{
				runLength = dataByte & 0x3F;
				dataByte = fgetc(f);
			}
			else
				runLength = 1;

			while(runLength-- > 0)
			{
				pix[0] = palette[dataByte*3];
				pix[1] = palette[dataByte*3+1];
				pix[2] = palette[dataByte*3+2];
				pix[3] = 255;
				pix += 4;
				x++;
			}
		}
	}
	image_width = pcx->xmax+1;
	image_height = pcx->ymax+1;

	fclose(f);
	return image_rgba;
}


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

			Targa

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

#define TGA_MAXCOLORS 16384

/* Definitions for image types. */
#define TGA_Null	0	/* no image data */
#define TGA_Map		1	/* Uncompressed, color-mapped images. */
#define TGA_RGB		2	/* Uncompressed, RGB images. */
#define TGA_Mono	3	/* Uncompressed, black and white images. */
#define TGA_RLEMap	9	/* Runlength encoded color-mapped images. */
#define TGA_RLERGB	10	/* Runlength encoded RGB images. */
#define TGA_RLEMono	11	/* Compressed, black and white images. */
#define TGA_CompMap	32	/* Compressed color-mapped data, using Huffman, Delta, and runlength encoding. */
#define TGA_CompMap4	33	/* Compressed color-mapped data, using Huffman, Delta, and runlength encoding. 4-pass quadtree-type process. */

/* Definitions for interleave flag. */
#define TGA_IL_None	0	/* non-interleaved. */
#define TGA_IL_Two	1	/* two-way (even/odd) interleaving */
#define TGA_IL_Four	2	/* four way interleaving */
#define TGA_IL_Reserved	3	/* reserved */

/* Definitions for origin flag */
#define TGA_O_UPPER	0	/* Origin in lower left-hand corner. */
#define TGA_O_LOWER	1	/* Origin in upper left-hand corner. */

typedef struct _TargaHeader
{
	unsigned char 	id_length, colormap_type, image_type;
	unsigned short	colormap_index, colormap_length;
	unsigned char	colormap_size;
	unsigned short	x_origin, y_origin, width, height;
	unsigned char	pixel_size, attributes;
} TargaHeader;

int fgetLittleShort (FILE *f)
{
	byte	b1, b2;

	b1 = fgetc(f);
	b2 = fgetc(f);

	return (short)(b1 + b2*256);
}

int fgetLittleLong (FILE *f)
{
	byte	b1, b2, b3, b4;

	b1 = fgetc(f);
	b2 = fgetc(f);
	b3 = fgetc(f);
	b4 = fgetc(f);

	return b1 + (b2<<8) + (b3<<16) + (b4<<24);
}

/*
=============
LoadTGA
=============
*/
byte *LoadTGA (FILE *fin, int matchwidth, int matchheight)
{
	int		w, h, x, y, realrow, truerow, baserow, i, temp1, temp2, pixel_size, map_idx;
	int		RLE_count, RLE_flag, size, interleave, origin;
	qboolean	mapped, rlencoded;
	byte		*data, *dst, r, g, b, a, j, k, l, *ColorMap;
	TargaHeader	header;

	header.id_length = fgetc (fin);
	header.colormap_type = fgetc (fin);
	header.image_type = fgetc (fin);
	header.colormap_index = fgetLittleShort (fin);
	header.colormap_length = fgetLittleShort (fin);
	header.colormap_size = fgetc (fin);
	header.x_origin = fgetLittleShort (fin);
	header.y_origin = fgetLittleShort (fin);
	header.width = fgetLittleShort (fin);
	header.height = fgetLittleShort (fin);
	header.pixel_size = fgetc (fin);
	header.attributes = fgetc (fin);

	if (header.width > IMAGE_MAX_DIMENSIONS || header.height > IMAGE_MAX_DIMENSIONS)
	{
		Con_DPrintf ("TGA image %s exceeds maximum supported dimensions\n", fin);
		fclose (fin);
		return NULL;
	}

	if ((matchwidth && header.width != matchwidth) || (matchheight && header.height != matchheight))
	{
		fclose (fin);
		return NULL;
	}

	if (header.id_length != 0)
		fseek (fin, header.id_length, SEEK_CUR);

	/* validate TGA type */
	switch (header.image_type)
	{
	case TGA_Map:
	case TGA_RGB:
	case TGA_Mono:
	case TGA_RLEMap:
	case TGA_RLERGB:
	case TGA_RLEMono:
		break;

	default:
		Con_DPrintf ("Unsupported TGA image %s: Only type 1 (map), 2 (RGB), 3 (mono), 9 (RLEmap), 10 (RLERGB), 11 (RLEmono) TGA images supported\n");
		fclose (fin);
		return NULL;
	}

	/* validate color depth */
	switch (header.pixel_size)
	{
	case 8:
	case 15:
	case 16:
	case 24:
	case 32:
		break;

	default:
		Con_DPrintf ("Unsupported TGA image %s: Only 8, 15, 16, 24 or 32 bit images (with colormaps) supported\n");
		fclose (fin);
		return NULL;
	}

	r = g = b = a = l = 0;

	/* if required, read the color map information. */
	ColorMap = NULL;
	mapped = (header.image_type == TGA_Map || header.image_type == TGA_RLEMap) && header.colormap_type == 1;
	if (mapped)
	{
		/* validate colormap size */
		switch (header.colormap_size)
		{
		case 8:
		case 15:
		case 16:
		case 32:
		case 24:
			break;

		default:
			Con_DPrintf ("Unsupported TGA image %s: Only 8, 15, 16, 24 or 32 bit colormaps supported\n");
			fclose (fin);
			return NULL;
		}

		temp1 = header.colormap_index;
		temp2 = header.colormap_length;
		if ((temp1 + temp2 + 1) >= TGA_MAXCOLORS)
		{
			fclose (fin);
			return NULL;
		}
		ColorMap = (byte*)(malloc (TGA_MAXCOLORS * 4));
		map_idx = 0;
		for (i = temp1 ; i < temp1 + temp2 ; ++i, map_idx += 4)
		{
			/* read appropriate number of bytes, break into rgb & put in map. */
			switch (header.colormap_size)
			{
			case 8:	/* grey scale, read and triplicate. */
				r = g = b = getc (fin);
				a = 255;
				break;

			case 15:	/* 5 bits each of red green and blue. */
						/* watch byte order. */
				j = getc (fin);
				k = getc (fin);
				l = ((unsigned int)k << 8) + j;
				r = (byte)(((k & 0x7C) >> 2) << 3);
				g = (byte)((((k & 0x03) << 3) + ((j & 0xE0) >> 5)) << 3);
				b = (byte)((j & 0x1F) << 3);
				a = 255;
				break;

			case 16:	/* 5 bits each of red green and blue, 1 alpha bit. */
						/* watch byte order. */
				j = getc (fin);
				k = getc (fin);
				l = ((unsigned int)k << 8) + j;
				r = (byte)(((k & 0x7C) >> 2) << 3);
				g = (byte)((((k & 0x03) << 3) + ((j & 0xE0) >> 5)) << 3);
				b = (byte)((j & 0x1F) << 3);
				a = (k & 0x80) ? 255 : 0;
				break;

			case 24:	/* 8 bits each of blue, green and red. */
				b = getc (fin);
				g = getc (fin);
				r = getc (fin);
				a = 255;
				l = 0;
				break;

			case 32:	/* 8 bits each of blue, green, red and alpha. */
				b = getc (fin);
				g = getc (fin);
				r = getc (fin);
				a = getc (fin);
				l = 0;
				break;
			}
			ColorMap[map_idx+0] = r;
			ColorMap[map_idx+1] = g;
			ColorMap[map_idx+2] = b;
			ColorMap[map_idx+3] = a;
		}
	}

	/* check run-length encoding. */
	rlencoded = (header.image_type == TGA_RLEMap || header.image_type == TGA_RLERGB || header.image_type == TGA_RLEMono);
	RLE_count = RLE_flag = 0;

	image_width = w = header.width;
	image_height = h = header.height;

	size = w * h * 4;
	data = (byte*)(malloc (size));

	/* read the Targa file body and convert to portable format. */
	pixel_size = header.pixel_size;
	origin = (header.attributes & 0x20) >> 5;
	interleave = (header.attributes & 0xC0) >> 6;
	truerow = baserow = 0;
	for (y=0 ; y<h ; y++)
	{
		realrow = truerow;
		if (origin == TGA_O_UPPER)
			realrow = h - realrow - 1;

		dst = data + realrow * w * 4;

		for (x=0 ; x<w ; x++)
		{
			/* check if run length encoded. */
			if (rlencoded)
			{
				if (!RLE_count)
				{
					/* have to restart run. */
					i = getc (fin);
					RLE_flag = (i & 0x80);
					if (!RLE_flag)	// stream of unencoded pixels
						RLE_count = i + 1;
					else		// single pixel replicated
						RLE_count = i - 127;
					/* decrement count & get pixel. */
					--RLE_count;
				}
				else
				{
					/* have already read count & (at least) first pixel. */
					--RLE_count;
					if (RLE_flag)
						/* replicated pixels. */
						goto PixEncode;
				}
			}

			/* read appropriate number of bytes, break into RGB. */
			switch (pixel_size)
			{
			case 8:	/* grey scale, read and triplicate. */
				r = g = b = l = getc (fin);
				a = 255;
				break;

			case 15:	/* 5 bits each of red green and blue. */
						/* watch byte order. */
				j = getc (fin);
				k = getc (fin);
				l = ((unsigned int)k << 8) + j;
				r = (byte)(((k & 0x7C) >> 2) << 3);
				g = (byte)((((k & 0x03) << 3) + ((j & 0xE0) >> 5)) << 3);
				b = (byte)((j & 0x1F) << 3);
				a = 255;
				break;

			case 16:	/* 5 bits each of red green and blue, 1 alpha bit. */
						/* watch byte order. */
				j = getc (fin);
				k = getc (fin);
				l = ((unsigned int)k << 8) + j;
				r = (byte)(((k & 0x7C) >> 2) << 3);
				g = (byte)((((k & 0x03) << 3) + ((j & 0xE0) >> 5)) << 3);
				b = (byte)((j & 0x1F) << 3);
				a = (k & 0x80) ? 255 : 0;
				break;

			case 24:	/* 8 bits each of blue, green and red. */
				b = getc (fin);
				g = getc (fin);
				r = getc (fin);
				a = 255;
				l = 0;
				break;

			case 32:	/* 8 bits each of blue, green, red and alpha. */
				b = getc (fin);
				g = getc (fin);
				r = getc (fin);
				a = getc (fin);
				l = 0;
				break;

			default:
				Con_DPrintf ("Malformed TGA image: Illegal pixel_size '%d'\n", pixel_size);
				fclose (fin);
				free (data);
				if (mapped)
					free (ColorMap);
				return NULL;
			}

PixEncode:
			if (mapped)
			{
				map_idx = l * 4;
				*dst++ = ColorMap[map_idx+0];
				*dst++ = ColorMap[map_idx+1];
				*dst++ = ColorMap[map_idx+2];
				*dst++ = ColorMap[map_idx+3];
			}
			else
			{
				*dst++ = r;
				*dst++ = g;
				*dst++ = b;
				*dst++ = a;
			}
		}

		if (interleave == TGA_IL_Four)
			truerow += 4;
		else if (interleave == TGA_IL_Two)
			truerow += 2;
		else
			truerow++;
		if (truerow >= h)
			truerow = ++baserow;
	}

	if (mapped)
		free (ColorMap);

	fclose (fin);

	return data;
}

/*small function to read files with stb_image - single-file image loader library.
** downloaded from: https://raw.githubusercontent.com/nothings/stb/master/stb_image.h
** only use jpeg+png formats, because tbh there's not much need for the others.
** */
#define STB_IMAGE_IMPLEMENTATION
#define STBI_ONLY_JPEG
#define STBI_ONLY_PNG
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdouble-promotion"
#include "../../../stb_image.h"
#pragma GCC diagnostic pop
byte* LoadSTBI(FILE *f, int width, int height)
{
	int bpp;
	int inwidth, inheight;
	byte* image = stbi_load_from_file(f, &inwidth, &inheight, &bpp, 4);
	// wtf?
	image_width = inwidth;
	image_height = inheight;
	fclose(f);
	return image;
}

byte* loadimagepixels (char* filename, qboolean complain, int matchwidth, int matchheight)

{
	FILE	*f;
	char	basename[128], name[132];
	byte	*c;

	if (complain == qfalse)
		COM_StripExtension(filename, basename); // strip the extension to allow TGA
	else
		strcpy(basename, filename);

	c = (byte*)basename;
	while (*c)
	{
		if (*c == '*')
			*c = '+';
		c++;
	}

	//Try PCX
	sprintf (name, "%s.pcx", basename);
	COM_FOpenFile (name, &f);
	if (f)
		return LoadPCX (f, matchwidth, matchheight);
	//Try TGA
	sprintf (name, "%s.tga", basename);
	COM_FOpenFile (name, &f);
	if (f)
		return LoadTGA (f, matchwidth, matchheight);
	//Try PNG
	sprintf (name, "%s.png", basename);
	COM_FOpenFile (name, &f);
	if (f)
		return LoadSTBI (f, matchwidth, matchheight);
	//Try JPEG
	sprintf (name, "%s.jpeg", basename);
	COM_FOpenFile (name, &f);
	if (f)
		return LoadSTBI (f, matchwidth, matchheight);
	sprintf (name, "%s.jpg", basename);
	COM_FOpenFile (name, &f);
	if (f)
		return LoadSTBI (f, matchwidth, matchheight);
	
	//if (complain)
	//	Con_Printf ("Couldn't load %s.tga or %s.pcx \n", filename);
	
	return NULL;
}

int loadtextureimage (char* filename, int matchwidth, int matchheight, qboolean complain, qboolean mipmap)
{
	int texnum;
	byte *data;
	if (!(data = loadimagepixels (filename, complain, matchwidth, matchheight))) { 
		Con_DPrintf("Cannot load image %s\n", filename);
		return 0;
	}
	texnum = GL_LoadTexture (filename, image_width, image_height, data, mipmap, qtrue, 4);
	free(data);
	return texnum;
}
// Tomaz || TGA End