quakeforge/libs/video/renderer/gl/gl_draw.c

/*
	gl_draw.c

	Draw functions for chars, textures, etc

	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

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

static __attribute__ ((used)) const char rcsid[] = 
	"$Id$";

#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif

#include <stdio.h>

#include "QF/cmd.h"
#include "QF/cvar.h"
#include "QF/draw.h"
#include "QF/dstring.h"
#include "QF/image.h"
#include "QF/quakefs.h"
#include "QF/render.h"
#include "QF/screen.h"
#include "QF/sys.h"
#include "QF/va.h"
#include "QF/vid.h"
#include "QF/GL/defines.h"
#include "QF/GL/funcs.h"
#include "QF/GL/qf_rmain.h"
#include "QF/GL/qf_rsurf.h"
#include "QF/GL/qf_textures.h"
#include "QF/GL/qf_vid.h"
#include "QF/GL/types.h"

#include "compat.h"
#include "gl_draw.h"
#include "r_cvar.h"
#include "r_shared.h"
#include "sbar.h"
#include "varrays.h"

byte	   *draw_chars;						// 8*8 graphic characters

int			tVAsize;
int		   *tVAindices;
int			tVAcount;
float	   *textVertices, *tV;
float	   *textCoords, *tC;

qpic_t	   *draw_backtile;

static int	translate_texture;
static int	char_texture;
static int	cs_texture;					// crosshair texturea

static byte color_0_8[4] = { 204, 204, 204, 255 };

// NOTE: this array is INCORRECT for direct uploading see Draw_Init
static byte cs_data[8 * 8 * 4] = {
		0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff,
		0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
		0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff,
		0xfe, 0xff, 0xfe, 0xff, 0xfe, 0xff, 0xfe, 0xff,
		0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff,
		0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
		0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff,
		0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,

		0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xff,
		0xff, 0xfe, 0xff, 0xff, 0xff, 0xfe, 0xff, 0xff,
		0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
		0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
		0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
		0xff, 0xfe, 0xff, 0xff, 0xff, 0xfe, 0xff, 0xff,
		0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xff,
		0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,

		//From FitzQuake
		255,255,255,255,255,255,255,255,
		255,255,255,  8,  9,255,255,255,
		255,255,255,  6,  8,  2,255,255,
		255,  6,  8,  8,  6,  8,  8,255,
		255,255,  2,  8,  8,  2,  2,  2,
		255,255,255,  7,  8,  2,255,255,
		255,255,255,255,  2,  2,255,255,
		255,255,255,255,255,255,255,255,
};

typedef struct {
	int			texnum;
} glpic_t;

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

#define	MAX_CACHED_PICS		128
static cachepic_t cachepics[MAX_CACHED_PICS];
static int		numcachepics;

static byte		menuplyr_pixels[4096];


static void
Draw_InitText (void)
{
	int		i;

	if (vaelements > 3) {
		tVAsize = vaelements - (vaelements % 4);
	} else if (vaelements >= 0) {
		tVAsize = 2048;
	} else
		tVAsize = 0;

	if (tVAsize) {
		Sys_MaskPrintf (SYS_DEV, "Text: %i maximum vertex elements.\n",
						tVAsize);

		if (textVertices)
			free (textVertices);
		textVertices = calloc (tVAsize, 2 * sizeof (float));

		if (textCoords)
			free (textCoords);
		textCoords = calloc (tVAsize, 2 * sizeof (float));

		qfglTexCoordPointer (2, GL_FLOAT, 0, textCoords);
		qfglVertexPointer (2, GL_FLOAT, 0, textVertices);
		if (tVAindices)
			free (tVAindices);
		tVAindices = (int *) calloc (tVAsize, sizeof (int));
		for (i = 0; i < tVAsize; i++)
			tVAindices[i] = i;
	} else {
		Sys_MaskPrintf (SYS_DEV, "Text: Vertex Array use disabled.\n");
	}
}

VISIBLE qpic_t *
Draw_PicFromWad (const char *name)
{
	glpic_t	   *gl;
	qpic_t	   *p, *pic;
	tex_t	   *targa;

	pic = W_GetLumpName (name);
	targa = LoadImage (name);
	if (targa) {
		p = malloc (sizeof (qpic_t) + sizeof (glpic_t));
		p->width = pic->width;
		p->height = pic->height;
		gl = (glpic_t *) p->data;
		if (targa->format < 4) {
			gl->texnum = GL_LoadTexture (name, targa->width, targa->height,
										 targa->data, false, false, 3);
		} else
			gl->texnum = GL_LoadTexture (name, targa->width, targa->height,
										 targa->data, false, true, 4);
	} else {
		p = pic;
		gl = (glpic_t *) p->data;
		gl->texnum = GL_LoadTexture (name, p->width, p->height, p->data,
									 false, true, 1);
	}
	return p;
}

static void
Draw_ClearCache (int phase)
{
	cachepic_t *pic;
	int         i;

	if (phase)
		return;
	for (pic = cachepics, i = 0; i < numcachepics; pic++, i++)
		pic->dirty = true;
}

VISIBLE qpic_t *
Draw_CachePic (const char *path, qboolean alpha)
{
	cachepic_t *pic;
	int         i;
	glpic_t    *gl;
	tex_t      *targa;

	// First, check if its cached..
	for (pic = cachepics, i = 0; i < numcachepics; pic++, i++)
		if ((!strcmp (path, pic->name)) && !pic->dirty)
			return &pic->pic;

	// Its not cached, lets make sure we have space in the cache..
	if (numcachepics == MAX_CACHED_PICS)
		Sys_Error ("menu_numcachepics == MAX_CACHED_PICS");

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

	if (!strcmp (path + strlen (path) - 4, ".lmp")) {
		// Load the picture..
		qpic_t     *dat = (qpic_t *) QFS_LoadFile (path, 0);
		if (!dat)
			Sys_Error ("Draw_CachePic: failed to load %s", path);

		// Adjust for endian..
		SwapPic (dat);
		// Check for a .tga first
		targa = LoadImage (path);
		if (targa) {
			if (targa->format < 4) {
				gl->texnum = GL_LoadTexture ("", targa->width, targa->height,
											 targa->data, false, alpha, 3);
			} else
				gl->texnum = GL_LoadTexture ("", targa->width, targa->height,
											 targa->data, false, alpha, 4);
		} else {
			gl->texnum = GL_LoadTexture ("", dat->width, dat->height,
										 dat->data, false, alpha, 1);
		}
		pic->pic.width = dat->width;
		pic->pic.height = dat->height;
		if (!strcmp (path, "gfx/menuplyr.lmp"))
			memcpy (menuplyr_pixels, dat->data, dat->width * dat->height);
		free (dat);
	} else
		Sys_Error ("Draw_CachePic: failed to load %s", path);

	strncpy (pic->name, path, sizeof (pic->name));

	// Now lets mark this cache entry as used..
	pic->dirty = false;
	numcachepics++;

	// And now we are done, return what was asked for..
	return &pic->pic;
}

VISIBLE void
Draw_TextBox (int x, int y, int width, int lines, byte alpha)
{
	int         cx, cy, n;
	qpic_t     *p;

	// draw left side
	color_white[3] = alpha;
	qfglColor4ubv (color_white);
	cx = x;
	cy = y;
	p = Draw_CachePic ("gfx/box_tl.lmp", true);
	Draw_Pic (cx, cy, p);
	p = Draw_CachePic ("gfx/box_ml.lmp", true);
	for (n = 0; n < lines; n++) {
		cy += 8;
		Draw_Pic (cx, cy, p);
	}
	p = Draw_CachePic ("gfx/box_bl.lmp", true);
	Draw_Pic (cx, cy + 8, p);

	// draw middle
	cx += 8;
	while (width > 0) {
		cy = y;
		p = Draw_CachePic ("gfx/box_tm.lmp", true);
		Draw_Pic (cx, cy, p);
		p = Draw_CachePic ("gfx/box_mm.lmp", true);
		for (n = 0; n < lines; n++) {
			cy += 8;
			if (n == 1)
				p = Draw_CachePic ("gfx/box_mm2.lmp", true);
			Draw_Pic (cx, cy, p);
		}
		p = Draw_CachePic ("gfx/box_bm.lmp", true);
		Draw_Pic (cx, cy + 8, p);
		width -= 2;
		cx += 16;
	}

	// draw right side
	cy = y;
	p = Draw_CachePic ("gfx/box_tr.lmp", true);
	Draw_Pic (cx, cy, p);
	p = Draw_CachePic ("gfx/box_mr.lmp", true);
	for (n = 0; n < lines; n++) {
		cy += 8;
		Draw_Pic (cx, cy, p);
	}
	p = Draw_CachePic ("gfx/box_br.lmp", true);
	Draw_Pic (cx, cy + 8, p);
	qfglColor3ubv (color_white);
}

VISIBLE void
Draw_Init (void)
{
	int	     i;
	tex_t	*image;
	byte    *cs_tmp_data;

	Cmd_AddCommand ("gl_texturemode", &GL_TextureMode_f,
					"Texture mipmap quality.");

	QFS_GamedirCallback (Draw_ClearCache);

	// load the console background and the charset by hand, because we need to
	// write the version string into the background before turning it into a
	// texture
	
	image = LoadImage ("gfx/conchars");
	if (image) {	
		if (image->format < 4) {
			char_texture = GL_LoadTexture ("charset", image->width,
										   image->height, image->data, false,
										   false, 3);
		} else
			char_texture = GL_LoadTexture ("charset", image->width,
										   image->height, image->data, false,
										   true, 4);
	} else {
		draw_chars = W_GetLumpName ("conchars");
		for (i = 0; i < 256 * 64; i++)
			if (draw_chars[i] == 0)
				draw_chars[i] = 255;		// proper transparent color
		
		char_texture = GL_LoadTexture ("charset", 128, 128, draw_chars, false,
									   true, 1);
	}

	// re-arrange the cs_data bytes so they're layed out properly for
	// subimaging
	cs_tmp_data = malloc (sizeof (cs_data));
	for (i = 0; i < 8 * 8; i++) {
		int         x, y;
		x = i % 8;
		y = i / 8;
		cs_tmp_data[y * 16 + x + 0 * 8 * 8 + 0] = cs_data[i + 0 * 8 * 8];
		cs_tmp_data[y * 16 + x + 0 * 8 * 8 + 8] = cs_data[i + 1 * 8 * 8];
		cs_tmp_data[y * 16 + x + 2 * 8 * 8 + 0] = cs_data[i + 2 * 8 * 8];
		cs_tmp_data[y * 16 + x + 2 * 8 * 8 + 8] = cs_data[i + 3 * 8 * 8];
	}
	cs_texture = GL_LoadTexture ("crosshair", 16, 16, cs_tmp_data,
								 false, true, 1);
	free (cs_tmp_data);

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

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

	// get the other pics we need
	draw_backtile = Draw_PicFromWad ("backtile");

	// LordHavoc: call init code for other GL renderer modules
	glrmain_init ();
	gl_lightmap_init ();

	Draw_InitText ();
}

#define CELL_SIZE 0.0625

static inline void
flush_text (void)
{
	qfglBindTexture (GL_TEXTURE_2D, char_texture);
	qfglDrawElements (GL_QUADS, tVAcount, GL_UNSIGNED_INT, tVAindices);
	tVAcount = 0;
	tV = textVertices;
	tC = textCoords;
}

static inline void
queue_character (float x, float y, int chr)
{
	float		frow, fcol;

	frow = (chr >> 4) * CELL_SIZE;
	fcol = (chr & 15) * CELL_SIZE;

	*tV++ = x;
	*tV++ = y;
	*tV++ = x + 8.0;
	*tV++ = y;
	*tV++ = x + 8.0;
	*tV++ = y + 8.0;
	*tV++ = x;
	*tV++ = y + 8.0;
	*tC++ = fcol;
	*tC++ = frow;
	*tC++ = fcol + CELL_SIZE;
	*tC++ = frow;
	*tC++ = fcol + CELL_SIZE;
	*tC++ = frow + CELL_SIZE;
	*tC++ = fcol;
	*tC++ = frow + CELL_SIZE;
}

static inline void
tVA_increment (void)
{
	tVAcount += 4;
	if (tVAcount + 4 > tVAsize)
		flush_text ();
}

/*
	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.
*/
VISIBLE void
Draw_Character (int x, int y, unsigned int chr)
{
	chr &= 255;

	if (chr == 32)
		return;							// space
	if (y <= -8)
		return;							// totally off screen

	queue_character ((float) x, (float) y, chr);
	tVA_increment ();
}

VISIBLE void
Draw_String (int x, int y, const char *str)
{
	unsigned char	chr;
	float			x1, y1;

	if (!str || !str[0])
		return;
	if (y <= -8)
		return;							// totally off screen

	x1 = (float) x;
	y1 = (float) y;

	while (*str) {
		if ((chr = *str++) != 32) {		// Don't render spaces
			queue_character (x1, y1, chr);
			tVA_increment ();
		}
		x1 += 8.0;
	}
}

VISIBLE void
Draw_nString (int x, int y, const char *str, int count)
{
	unsigned char	chr;
	float			x1, y1;

	if (!str || !str[0])
		return;
	if (y <= -8)
		return;                         // totally off screen

	x1 = (float) x;
	y1 = (float) y;

	while (count-- && *str) {
		if ((chr = *str++) != 32) {		// Don't render spaces
			queue_character (x1, y1, chr);
			tVA_increment ();
		}
		x1 += 8.0;
	}
}

void
Draw_AltString (int x, int y, const char *str)
{
	unsigned char	chr;
	float			x1, y1;

	if (!str || !str[0])
		return;
	if (y <= -8)
		return;							// totally off screen

	x1 = (float) x;
	y1 = (float) y;

	while (*str) {
		if ((chr = *str++ | 0x80) != (0x80 | 32)) {		// Don't render spaces
			queue_character (x1, y1, chr);
			tVA_increment ();
		}
		x1 += 8.0;
	}
}

static void
crosshair_1 (int x, int y)
{
	Draw_Character (x - 4, y - 4, '+');
}

static void
crosshair_2 (int x, int y)
{
	unsigned char *pColor;

	pColor = (unsigned char *) &d_8to24table[crosshaircolor->int_val];
	qfglColor4ubv (pColor);
	qfglBindTexture (GL_TEXTURE_2D, cs_texture);

	qfglBegin (GL_QUADS);

	qfglTexCoord2f (0, 0);
	qfglVertex2f (x - 7, y - 7);
	qfglTexCoord2f (0.5, 0);
	qfglVertex2f (x + 9, y - 7);
	qfglTexCoord2f (0.5, 0.5);
	qfglVertex2f (x + 9, y + 9);
	qfglTexCoord2f (0, 0.5);
	qfglVertex2f (x - 7, y + 9);

	qfglEnd ();
	qfglColor3ubv (color_white);
}

static void
crosshair_3 (int x, int y)
{
	unsigned char *pColor;

	pColor = (unsigned char *) &d_8to24table[crosshaircolor->int_val];
	qfglColor4ubv (pColor);
	qfglBindTexture (GL_TEXTURE_2D, cs_texture);

	qfglBegin (GL_QUADS);

	qfglTexCoord2f (0.5, 0);
	qfglVertex2f (x - 7, y - 7);
	qfglTexCoord2f (1, 0);
	qfglVertex2f (x + 9, y - 7);
	qfglTexCoord2f (1, 0.5);
	qfglVertex2f (x + 9, y + 9);
	qfglTexCoord2f (0.5, 0.5);
	qfglVertex2f (x - 7, y + 9);

	qfglEnd ();
	qfglColor3ubv (color_white);
}

static void
crosshair_4 (int x, int y)
{
	unsigned char *pColor;

	pColor = (unsigned char *) &d_8to24table[crosshaircolor->int_val];
	qfglColor4ubv (pColor);
	qfglBindTexture (GL_TEXTURE_2D, cs_texture);

	qfglBegin (GL_QUADS);

	qfglTexCoord2f (0, 0.5);
	qfglVertex2f (x - 7, y - 7);
	qfglTexCoord2f (0.5, 0.5);
	qfglVertex2f (x + 9, y - 7);
	qfglTexCoord2f (0.5, 1);
	qfglVertex2f (x + 9, y + 9);
	qfglTexCoord2f (0, 1);
	qfglVertex2f (x - 7, y + 9);

	qfglEnd ();
	qfglColor3ubv (color_white);
}

static void
crosshair_5 (int x, int y)	//FIXME don't use until the data is filled in
{
	unsigned char *pColor;

	pColor = (unsigned char *) &d_8to24table[crosshaircolor->int_val];
	qfglColor4ubv (pColor);
	qfglBindTexture (GL_TEXTURE_2D, cs_texture);

	qfglBegin (GL_QUADS);

	qfglTexCoord2f (0.5, 0.5);
	qfglVertex2f (x - 7, y - 7);
	qfglTexCoord2f (1, 0.5);
	qfglVertex2f (x + 9, y - 7);
	qfglTexCoord2f (1, 1);
	qfglVertex2f (x + 9, y + 9);
	qfglTexCoord2f (0.5, 1);
	qfglVertex2f (x - 7, y + 9);

	qfglEnd ();
	qfglColor3ubv (color_white);
}

static void (*crosshair_func[]) (int x, int y) = {
	crosshair_1,
	crosshair_2,
	crosshair_3,
	crosshair_4,
	crosshair_5,
};

VISIBLE void
Draw_Crosshair (void)
{
	int            x, y;
	int            ch;

	ch = crosshair->int_val - 1;
	if ((unsigned) ch >= sizeof (crosshair_func) / sizeof (crosshair_func[0]))
		return;

	x = vid.conwidth / 2 + cl_crossx->int_val;
	y = vid.conheight / 2 + cl_crossy->int_val;

	crosshair_func[ch] (x, y);
}

void
Draw_CrosshairAt (int ch, int x, int y)
{
	ch -= 1;
	if ((unsigned) ch >= sizeof (crosshair_func) / sizeof (crosshair_func[0]))
		return;

	crosshair_func[ch] (x, y);
}

VISIBLE void
Draw_Pic (int x, int y, qpic_t *pic)
{
	glpic_t    *gl;

	gl = (glpic_t *) pic->data;

	qfglBindTexture (GL_TEXTURE_2D, gl->texnum);
	qfglBegin (GL_QUADS);
	qfglTexCoord2f (0, 0);
	qfglVertex2f (x, y);
	qfglTexCoord2f (1, 0);
	qfglVertex2f (x + pic->width, y);
	qfglTexCoord2f (1, 1);
	qfglVertex2f (x + pic->width, y + pic->height);
	qfglTexCoord2f (0, 1);
	qfglVertex2f (x, y + pic->height);
	qfglEnd ();
}

VISIBLE void
Draw_SubPic (int x, int y, qpic_t *pic, int srcx, int srcy, int width,
			 int height)
{
	float       newsl, newtl, newsh, newth;
	glpic_t    *gl;

	gl = (glpic_t *) pic->data;

	newsl = (float) srcx / (float) pic->width;
	newsh = newsl + (float) width / (float) pic->width;

	newtl = (float) srcy / (float) pic->height;
	newth = newtl + (float) height / (float) pic->height;

	qfglColor3ubv (color_0_8);
	qfglBindTexture (GL_TEXTURE_2D, gl->texnum);
	qfglBegin (GL_QUADS);
	qfglTexCoord2f (newsl, newtl);
	qfglVertex2f (x, y);
	qfglTexCoord2f (newsh, newtl);
	qfglVertex2f (x + width, y);
	qfglTexCoord2f (newsh, newth);
	qfglVertex2f (x + width, y + height);
	qfglTexCoord2f (newsl, newth);
	qfglVertex2f (x, y + height);
	qfglEnd ();
	qfglColor3ubv (color_white);
}

/*
	Draw_ConsoleBackground

	Draws console background (obviously!)  Completely rewritten to use
	several simple yet very cool GL effects.  --KB
*/
VISIBLE void
Draw_ConsoleBackground (int lines, byte alpha)
{
	float       ofs;
	glpic_t    *gl;
	qpic_t     *conback;

	GL_FlushText (); // Flush text that should be rendered before the console

	// This can be a CachePic now, just like in software
	conback = Draw_CachePic ("gfx/conback.lmp", false);
	gl = (glpic_t *) conback->data;

	// spin the console? - effect described in a QER tutorial
	if (gl_conspin->value) {
		static float xangle = 0;
		static float xfactor = .3f;
		static float xstep = .005f;

		qfglPushMatrix ();
		qfglMatrixMode (GL_TEXTURE);
		qfglPushMatrix ();
		qfglLoadIdentity ();
		xangle += gl_conspin->value;
		xfactor += xstep;
		if (xfactor > 8 || xfactor < .3f)
			xstep = -xstep;
		qfglRotatef (xangle, 0, 0, 1);
		qfglScalef (xfactor, xfactor, xfactor);
	}
	// slide console up/down or stretch it?
	if (gl_constretch->int_val) {
		ofs = 0;
	} else
		ofs = (vid.conheight - lines) / (float) vid.conheight;

	color_0_8[3] = alpha;
	qfglColor4ubv (color_0_8);

	// draw the console texture
	qfglBindTexture (GL_TEXTURE_2D, gl->texnum);
	qfglBegin (GL_QUADS);
	qfglTexCoord2f (0, 0 + ofs);
	qfglVertex2f (0, 0);
	qfglTexCoord2f (1, 0 + ofs);
	qfglVertex2f (vid.conwidth, 0);
	qfglTexCoord2f (1, 1);
	qfglVertex2f (vid.conwidth, lines);
	qfglTexCoord2f (0, 1);
	qfglVertex2f (0, lines);
	qfglEnd ();

	// turn off alpha blending
	if (alpha < 255) {
		qfglColor3ubv (color_0_8);
	}

	if (gl_conspin->value) {
		qfglPopMatrix ();
		qfglMatrixMode (GL_MODELVIEW);
		qfglPopMatrix ();
	}

	Draw_AltString (vid.conwidth - strlen (cl_verstring->string) * 8 - 11,
					lines - 14, cl_verstring->string);
	qfglColor3ubv (color_white);
}

/*
	Draw_TileClear

	This repeats a 64*64 tile graphic to fill the screen around a sized down
	refresh window.
*/
VISIBLE void
Draw_TileClear (int x, int y, int w, int h)
{
	glpic_t    *gl;
	qfglColor3ubv (color_0_8);
	gl = (glpic_t *) draw_backtile->data;
	qfglBindTexture (GL_TEXTURE_2D, gl->texnum);
	qfglBegin (GL_QUADS);
	qfglTexCoord2f (x / 64.0, y / 64.0);
	qfglVertex2f (x, y);
	qfglTexCoord2f ((x + w) / 64.0, y / 64.0);
	qfglVertex2f (x + w, y);
	qfglTexCoord2f ((x + w) / 64.0, (y + h) / 64.0);
	qfglVertex2f (x + w, y + h);
	qfglTexCoord2f (x / 64.0, (y + h) / 64.0);
	qfglVertex2f (x, y + h);
	qfglEnd ();
	qfglColor3ubv (color_white);
}

/*
	Draw_Fill

	Fills a box of pixels with a single color
*/
VISIBLE void
Draw_Fill (int x, int y, int w, int h, int c)
{
	qfglDisable (GL_TEXTURE_2D);
	qfglColor3ubv (vid.palette + c * 3);

	qfglBegin (GL_QUADS);

	qfglVertex2f (x, y);
	qfglVertex2f (x + w, y);
	qfglVertex2f (x + w, y + h);
	qfglVertex2f (x, y + h);

	qfglEnd ();
	qfglColor3ubv (color_white);
	qfglEnable (GL_TEXTURE_2D);
}

VISIBLE void
Draw_FadeScreen (void)
{
	GL_FlushText (); // Flush text that should be rendered before the menu

	qfglDisable (GL_TEXTURE_2D);
	qfglColor4ub (0, 0, 0, 179);
	qfglBegin (GL_QUADS);

	qfglVertex2f (0, 0);
	qfglVertex2f (vid.conwidth, 0);
	qfglVertex2f (vid.conwidth, vid.conheight);
	qfglVertex2f (0, vid.conheight);

	qfglEnd ();
	qfglColor3ubv (color_white);
	qfglEnable (GL_TEXTURE_2D);

	Sbar_Changed ();
}

static void
set_2d (int width, int height)
{
	qfglViewport (0, 0, vid.width, vid.height);

	qfglMatrixMode (GL_PROJECTION);
	qfglLoadIdentity ();
	qfglOrtho (0, width, height, 0, -99999, 99999);

	qfglMatrixMode (GL_MODELVIEW);
	qfglLoadIdentity ();

	qfglDisable (GL_DEPTH_TEST);
	qfglDisable (GL_CULL_FACE);

	qfglColor3ubv (color_white);

	qfglEnableClientState (GL_VERTEX_ARRAY);
	qfglVertexPointer (2, GL_FLOAT, 0, textVertices);
	qfglEnableClientState (GL_TEXTURE_COORD_ARRAY);
	qfglTexCoordPointer (2, GL_FLOAT, 0, textCoords);
	qfglDisableClientState (GL_COLOR_ARRAY);
}

void
GL_Set2D (void)
{
	set_2d (vid.width, vid.height);
}

void
GL_Set2DScaled (void)
{
	set_2d (vid.conwidth, vid.conheight);
}

void
GL_DrawReset (void)
{
	tVAcount = 0;
	tV = textVertices;
	tC = textCoords;
}

void
GL_FlushText (void)
{
	if (tVAcount) {
		flush_text ();
	}
}