/*
Copyright (C) 2001-2002 Charles Hollemeersch

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.

Texture loading/caching
most of it comes from gl_draw.c
where it dind't really belong
*/
#include "quakedef.h"
#include <stdlib.h>

#define GL_COLOR_INDEX8_EXT     0x80E5

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"};
cvar_t          gl_gloss = {"gl_gloss", "0.3"};
cvar_t          gl_compress_textures = {"gl_compress_textures", "0"};
cvar_t          willi_gray_colormaps = {"willi_gray_colormaps", "0"};

/*
cvar_t          cg_conclock = {"cg_conclock", "1", true};

byte		*draw_chars;				// 8*8 graphic characters
qpic_t		*draw_disc;
qpic_t		*draw_backtile;

int			translate_texture;
int			char_texture;
*/
int			glow_texture_object;	//PENTA: gl texture object of the glow texture
int			normcube_texture_object; //PENTA: normalization cubemap
int			atten1d_texture_object;
int			atten2d_texture_object;
int			atten3d_texture_object;
int			halo_texture_object;

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

byte		conback_buffer[sizeof(qpic_t) + sizeof(glpic_t)];
qpic_t		*conback = (qpic_t *)&conback_buffer;
*/
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;

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

qboolean is_overriden;

// <AWE> added local prototypes.
int		GL_Load2DAttenTexture (void);
int		GL_Load3DAttenTexture (void);
int		GL_LoadBumpTexture (void);
int		GL_LoadNormalizationCubemap (void);
int		GL_LoadPicTexture (qpic_t *pic);

/*void GL_Bind (int texnum)
{
	if (gl_nobind.value)
		texnum = char_texture;
	if (currenttexture == texnum)
		return;
	currenttexture = texnum;
//#ifdef _WIN32
//	bindTexFunc (GL_TEXTURE_2D, texnum);
//#else
	glBindTexture(GL_TEXTURE_2D, texnum);
//#endif

/*
	Don't do this anisotropy is part of the texture state, it is set when you bind the texture

        if (gl_texturefilteranisotropic)	// <AWE> anisotropic texture filtering
        {
            glTexParameterfv (GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, &gl_textureanisotropylevel);
        }
*/
//}

/*
================
GL_GetOverrideName
================
*/
void GL_GetOverrideName(char *identifier,char *tail,char* dest) {
	int i;

	sprintf(dest,"%s%s.tga", identifier, tail);
	for (i=0; i<strlen(dest); i++) {
		if (dest[i] == '*')
			dest[i] = '%';
	}
}


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

Allow texture filtering to be set by the user (console)
===============
*/
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);
			//PENTA: also update bump maps
			GL_Bind (glt->texnum+1);
			glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
			glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
		}
	}
}

/*
================
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_ResampleTextureLerpLine

Interpolates between pixels on line - Eradicator
================
*/
void GL_ResampleTextureLerpLine (byte *in, byte *out, int inwidth, int outwidth)
{
	int		j, xi, oldx = 0, f, fstep, endx;
	fstep = (int) (inwidth*65536.0f/outwidth);
	endx = (inwidth-1);
	for (j = 0,f = 0;j < outwidth;j++, f += fstep)
	{
		xi = (int) f >> 16;
		if (xi != oldx)
		{
			in += (xi - oldx) * 4;
			oldx = xi;
		}
		if (xi < endx)
		{
			int lerp = f & 0xFFFF;
			*out++ = (byte) ((((in[4] - in[0]) * lerp) >> 16) + in[0]);
			*out++ = (byte) ((((in[5] - in[1]) * lerp) >> 16) + in[1]);
			*out++ = (byte) ((((in[6] - in[2]) * lerp) >> 16) + in[2]);
			*out++ = (byte) ((((in[7] - in[3]) * lerp) >> 16) + in[3]);
		}
		else
		{
			*out++ = in[0];
			*out++ = in[1];
			*out++ = in[2];
			*out++ = in[3];
		}
	}
}

/*
================
GL_ResampleTexture
================
*/
void GL_ResampleTexture (void *indata, int inwidth, int inheight, void *outdata,  int outwidth, int outheight)
{
	//New Interpolated Texture Code - Eradicator
	int		i, j, yi, oldy, f, fstep, endy = (inheight-1);
	byte	*inrow, *out, *row1, *row2;
	out = outdata;
	fstep = (int) (inheight*65536.0f/outheight);

	row1 = malloc(outwidth*4);
	row2 = malloc(outwidth*4);
	inrow = indata;
	oldy = 0;
	GL_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
	GL_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
	for (i = 0, f = 0;i < outheight;i++,f += fstep)
	{
		yi = f >> 16;
		if (yi < endy)
		{
			int lerp = f & 0xFFFF;
			if (yi != oldy)
			{
				inrow = (byte *)indata + inwidth*4*yi;
				if (yi == oldy+1)
					memcpy(row1, row2, outwidth*4);
				else
					GL_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
				GL_ResampleTextureLerpLine (inrow + inwidth*4, row2, inwidth, outwidth);
				oldy = yi;
			}
			j = outwidth - 4;
			while(j >= 0)
			{
				out[ 0] = (byte) ((((row2[ 0] - row1[ 0]) * lerp) >> 16) + row1[ 0]);
				out[ 1] = (byte) ((((row2[ 1] - row1[ 1]) * lerp) >> 16) + row1[ 1]);
				out[ 2] = (byte) ((((row2[ 2] - row1[ 2]) * lerp) >> 16) + row1[ 2]);
				out[ 3] = (byte) ((((row2[ 3] - row1[ 3]) * lerp) >> 16) + row1[ 3]);
				out[ 4] = (byte) ((((row2[ 4] - row1[ 4]) * lerp) >> 16) + row1[ 4]);
				out[ 5] = (byte) ((((row2[ 5] - row1[ 5]) * lerp) >> 16) + row1[ 5]);
				out[ 6] = (byte) ((((row2[ 6] - row1[ 6]) * lerp) >> 16) + row1[ 6]);
				out[ 7] = (byte) ((((row2[ 7] - row1[ 7]) * lerp) >> 16) + row1[ 7]);
				out[ 8] = (byte) ((((row2[ 8] - row1[ 8]) * lerp) >> 16) + row1[ 8]);
				out[ 9] = (byte) ((((row2[ 9] - row1[ 9]) * lerp) >> 16) + row1[ 9]);
				out[10] = (byte) ((((row2[10] - row1[10]) * lerp) >> 16) + row1[10]);
				out[11] = (byte) ((((row2[11] - row1[11]) * lerp) >> 16) + row1[11]);
				out[12] = (byte) ((((row2[12] - row1[12]) * lerp) >> 16) + row1[12]);
				out[13] = (byte) ((((row2[13] - row1[13]) * lerp) >> 16) + row1[13]);
				out[14] = (byte) ((((row2[14] - row1[14]) * lerp) >> 16) + row1[14]);
				out[15] = (byte) ((((row2[15] - row1[15]) * lerp) >> 16) + row1[15]);
				out += 16;
				row1 += 16;
				row2 += 16;
				j -= 4;
			}
			if (j & 2)
			{
				out[ 0] = (byte) ((((row2[ 0] - row1[ 0]) * lerp) >> 16) + row1[ 0]);
				out[ 1] = (byte) ((((row2[ 1] - row1[ 1]) * lerp) >> 16) + row1[ 1]);
				out[ 2] = (byte) ((((row2[ 2] - row1[ 2]) * lerp) >> 16) + row1[ 2]);
				out[ 3] = (byte) ((((row2[ 3] - row1[ 3]) * lerp) >> 16) + row1[ 3]);
				out[ 4] = (byte) ((((row2[ 4] - row1[ 4]) * lerp) >> 16) + row1[ 4]);
				out[ 5] = (byte) ((((row2[ 5] - row1[ 5]) * lerp) >> 16) + row1[ 5]);
				out[ 6] = (byte) ((((row2[ 6] - row1[ 6]) * lerp) >> 16) + row1[ 6]);
				out[ 7] = (byte) ((((row2[ 7] - row1[ 7]) * lerp) >> 16) + row1[ 7]);
				out += 8;
				row1 += 8;
				row2 += 8;
			}
			if (j & 1)
			{
				out[ 0] = (byte) ((((row2[ 0] - row1[ 0]) * lerp) >> 16) + row1[ 0]);
				out[ 1] = (byte) ((((row2[ 1] - row1[ 1]) * lerp) >> 16) + row1[ 1]);
				out[ 2] = (byte) ((((row2[ 2] - row1[ 2]) * lerp) >> 16) + row1[ 2]);
				out[ 3] = (byte) ((((row2[ 3] - row1[ 3]) * lerp) >> 16) + row1[ 3]);
				out += 4;
				row1 += 4;
				row2 += 4;
			}
			row1 -= outwidth*4;
			row2 -= outwidth*4;
		}
		else
		{
			if (yi != oldy)
			{
				inrow = (byte *)indata + inwidth*4*yi;
				if (yi == oldy+1)
					memcpy(row1, row2, outwidth*4);
				else
					GL_ResampleTextureLerpLine (inrow, row1, inwidth, outwidth);
				oldy = yi;
			}
			memcpy(out, row1, outwidth * 4);
		}
	}
	free(row1);
	free(row2);

	//Old Code - Eradicator
	/*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;
		}
	}
}

/*
================
PENTA:
GL_MipMapGray

Operates in place, quartering the size of the texture
================
*/
void GL_MipMapGray (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+=2, out+=1, in+=2)
		{
			out[0] = (in[0] + in[1] + in[width+0] + in[width+1])>>2;
		}
	}
}

/*
================
GL_MipMapNormal

Operates in place, quartering the size of the texture
Works on normal maps instead of rgb
================
*/
void GL_MipMapNormal (byte *in, int width, int height)
{
    int		i, j;
    byte	*out;
    float	inv255	= 1.0f/255.0f;
    float	inv127	= 1.0f/127.0f;
    float	x,y,z,l,g;


    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)
	{
	    x = (inv127*in[0]-1.0)+
		(inv127*in[4]-1.0)+
		(inv127*in[width+0]-1.0)+
		(inv127*in[width+4]-1.0);
	    y = (inv127*in[1]-1.0)+
		(inv127*in[5]-1.0)+
		(inv127*in[width+1]-1.0)+
		(inv127*in[width+5]-1.0);
	    z = (inv127*in[2]-1.0)+
		(inv127*in[6]-1.0)+
		(inv127*in[width+2]-1.0)+
		(inv127*in[width+6]-1.0);

	    g = (inv255*in[3])+

		(inv255*in[7])+

		(inv255*in[width+3])+

		(inv255*in[width+7]);


            l = sqrt(x*x+y*y+z*z);
	    if (l == 0.0) {
		x = 0.0;
		y = 0.0;
		z = 1.0;
	    } else {
		//normalize it.
		l=1/l;
		x *=l;
		y *=l;
		z *=l;
	    }
	    out[0] = (unsigned char)128 + 127*x;
	    out[1] = (unsigned char)128 + 127*y;
	    out[2] = (unsigned char)128 + 127*z;
	    out[3] = (byte)(g * 255.0/4.0);
	}
    }

}

void GL_Normalize(byte *in, int width, int height)
{
    int		i, j;
    byte	*out;
    float	inv255	= 1.0f/255.0f;
    float	inv127	= 1.0f/127.0f;
    float	x,y,z,l;

    width <<=2;
    out = in;
    for (i=0 ; i<height ; i++)
    {
	for (j=0 ; j<width ; j+=4, out+=4, in+=4)
	{
	    x = (inv127*in[0]-1.0);
	    y = (inv127*in[1]-1.0);
            z = (inv127*in[2]-1.0);

            l = sqrt(x*x+y*y+z*z);
	    if (l == 0.0) {
		x = 0.0;
		y = 0.0;
		z = 1.0;
	    } else {
		//normalize it.
		l=1/l;
		x *=l;
		y *=l;
		z *=l;
	    }
	    out[0] = (unsigned char)128 + 127*x;
	    out[1] = (unsigned char)128 + 127*y;
	    out[2] = (unsigned char)128 + 127*z;
	}
    }

}

/*
================
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)];
		}
	}
}

/*
===============
PENTA:
Packs the byte values in gloss in the alpha channel of dest
<AWE> : added "void" as return type.
===============
*/
void GL_PackGloss(byte *gloss,unsigned *dest,int length)
{
    int i;

    for (i=0; i<length; i++, gloss++, dest++) 

    {
        *dest = *dest & LittleLong (0x00FFFFFF);	// <AWE> Added support for big endian.
        *dest = *dest | LittleLong (*gloss << 24);	// <AWE> Added support for big endian.
    }
}

/*
===============
GL_Upload32

  Upload an ordinary 32 bit texture
===============
*/
void GL_Upload32 (unsigned *data, int width, int height,  qboolean mipmap, qboolean alpha)
{
	int			texturemode;
	//XYZ
static	unsigned	scaled[1024*1024];	// [512*256];
	int			scaled_width, scaled_height;

        if ( willi_gray_colormaps.value )
        {
	    Q_memset(data, 0x7f, width*height*4);
        }

	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 ("GL_LoadTexture: too big");

        if ( gl_texcomp && ((int)gl_compress_textures.value) & 1 )
        {
            texturemode = GL_COMPRESSED_RGBA_ARB;
        }
        else
        {
            texturemode = GL_RGBA;//PENTA: Always upload rgb it doesn't make any difference for nvidia cards (& others)
	    //texturemode = alpha ? gl_alpha_format : gl_solid_format;
        }
#if 0
	if (mipmap)
		gluBuild2DMipmaps (GL_TEXTURE_2D, texturemode, width, height, GL_RGBA, GL_UNSIGNED_BYTE, trans);
	else if (scaled_width == width && scaled_height == height)
		glTexImage2D (GL_TEXTURE_2D, 0, texturemode, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, trans);
	else
	{
		gluScaleImage (GL_RGBA, width, height, GL_UNSIGNED_BYTE, trans,
			scaled_width, scaled_height, GL_UNSIGNED_BYTE, scaled);
		glTexImage2D (GL_TEXTURE_2D, 0, texturemode, scaled_width, scaled_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, scaled);
	}
#else
texels += scaled_width * scaled_height;

	if (scaled_width == width && scaled_height == height)
	{
		if (!mipmap)
		{
			glTexImage2D (GL_TEXTURE_2D, 0, texturemode, 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, texturemode, 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, texturemode, scaled_width, scaled_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, scaled);
                }
	}
done: ;
#endif


	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);
	}

	if (gl_texturefilteranisotropic)
		glTexParameterfv (GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, &gl_textureanisotropylevel);
}

/*
===============
genNormalMap

  Generate a normal map from the given heightmap
===============
*/
unsigned int * genNormalMap(byte *pixels, int w, int h, float scale)
{
  int i, j, wr, hr;
  unsigned char r, g, b;
  static unsigned nmap[512*512];
  float sqlen, reciplen, nx, ny, nz;

  const float oneOver255 = 1.0f/255.0f;

  float c, cx, cy, dcx, dcy;

  wr = w;
  hr = h;

  for (i=0; i<h; i++) {
    for (j=0; j<w; j++) {
      /* Expand [0,255] texel values to the [0,1] range. */
      c = pixels[i*wr + j] * oneOver255;
      /* Expand the texel to its right. */
      cx = pixels[i*wr + (j+1)%wr] * oneOver255;
      /* Expand the texel one up. */
      cy = pixels[((i+1)%hr)*wr + j] * oneOver255;
      dcx = scale * (c - cx);
      dcy = scale * (c - cy);

      /* Normalize the vector. */
      sqlen = dcx*dcx + dcy*dcy + 1;
      reciplen = 1.0f/(float)sqrt(sqlen);
      nx = dcx*reciplen;
      ny = -dcy*reciplen;
      nz = reciplen;

      /* Repack the normalized vector into an RGB unsigned byte
         vector in the normal map image. */
      r = (byte) (128 + 127*nx);
      g = (byte) (128 + 127*ny);
      b = (byte) (128 + 127*nz);

      /* The highest resolution mipmap level always has a
         unit length magnitude. */
      nmap[i*w+j] = LittleLong ((255 << 24)|(b << 16)|(g << 8)|(r));	// <AWE> Added support for big endian.
    }
  }

  return &nmap[0];
}

/*
===============
GL_UploadBump

  Upload an bump map (converts it to a normal map first...)
===============
*/
void GL_UploadBump(byte *data, int width, int height, qboolean mipmap, byte* gloss)
{
    static unsigned char	scaled[1024*1024];	// [512*256];
    static unsigned char	scaledgloss[1024*1024];	// [512*256];
    int			scaled_width, scaled_height;
    byte			*nmap;
    int			texturemode;

    if ( gl_texcomp && ((int)gl_compress_textures.value) & 2 )
    {
	texturemode = GL_COMPRESSED_RGBA_ARB;
    }
    else
    {
	texturemode = GL_RGBA;
    }

    //Resize to power of 2 and maximum texture size
    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 ("GL_LoadTexture: too big");

    //To resize or not to resize
    if (scaled_width == width && scaled_height == height)
    {
	memcpy (scaled, data, width*height);
	memcpy (scaledgloss, gloss, width*height);
	scaled_width = width;
	scaled_height = height;
    }
    else
    {
	//Just picks pixels so grayscale is equivalent with 8 bit.
	GL_Resample8BitTexture (data, width, height, scaled, scaled_width, scaled_height);
	GL_Resample8BitTexture (gloss, width, height, scaledgloss, scaled_width, scaled_height);
    }

    if (is_overriden)
	nmap = (byte *)genNormalMap(scaled,scaled_width,scaled_height,10.0f); 
    else
	nmap = (byte *)genNormalMap(scaled,scaled_width,scaled_height,4.0f);

    GL_PackGloss(scaledgloss, (unsigned int*)nmap, scaled_width*scaled_height);

    glTexImage2D (GL_TEXTURE_2D, 0, texturemode, scaled_width, scaled_height, 0,
		  GL_RGBA, GL_UNSIGNED_BYTE, nmap);

    //glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    //glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    if (mipmap)
    {
	int		miplevel;

	miplevel = 0;
	while (scaled_width > 1 || scaled_height > 1)
	{
	    GL_MipMapNormal(nmap,scaled_width,scaled_height);
	    //GL_MipMapGray((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, texturemode, scaled_width, scaled_height, 0, GL_RGBA,
			  GL_UNSIGNED_BYTE, nmap);
	}
    }

    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);
    }

        
    if (gl_texturefilteranisotropic)
	glTexParameterfv (GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, &gl_textureanisotropylevel);

}


/*
===============
GL_UploadNormal

  Upload as an normal map
===============
*/
void GL_UploadNormal(unsigned int *data, int width, int height, qboolean mipmap)
{
    static unsigned int	scaled[1024*1024];	// [512*256];
    int			scaled_width, scaled_height;
    int			texturemode;

    if ( gl_texcomp && ((int)gl_compress_textures.value) & 2 )
    {
        texturemode = GL_COMPRESSED_RGBA_ARB;
    }
    else
    {
        texturemode = GL_RGBA;
    }

    //Resize to power of 2 and maximum texture size
    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 ("GL_LoadTexture: too big");

    //To resize or not to resize
    if (scaled_width == width && scaled_height == height)
    {
		memcpy (scaled, data, width*height*4);
		scaled_width = width;
		scaled_height = height;
    }
    else {
		GL_ResampleTexture ((unsigned*)data, width, height, scaled, scaled_width, scaled_height);
    }

    GL_Normalize((byte*)scaled, scaled_width, scaled_height);
    glTexImage2D (GL_TEXTURE_2D, 0, texturemode, scaled_width, scaled_height, 0,
		  GL_RGBA, GL_UNSIGNED_BYTE, scaled);

    //glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    //glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    if (mipmap)
    {
		int		miplevel;

		miplevel = 0;
		while (scaled_width > 1 || scaled_height > 1)
		{
			GL_MipMapNormal((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, texturemode, scaled_width, scaled_height, 0, GL_RGBA,
				  GL_UNSIGNED_BYTE, scaled);
		}
    }

    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);
    }

    if (gl_texturefilteranisotropic)
		glTexParameterfv (GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, &gl_textureanisotropylevel);

}

/*
===============
GL_Upload8
===============
*/
	//XYZ
unsigned	trans[1024*1024];		// FIXME, temporary
static	unsigned char	glosspix[1024*1024];

#define RED_MASK 0x00FF0000
#define GREEN_MASK 0x0000FF00
#define BLUE_MASK 0x000000FF

void GL_Upload8 (byte *data,char *identifier, int width, int height,  qboolean mipmap, qboolean alpha, qboolean bump)
{
	//XYZ
static	unsigned char	bumppix[1024*1024];	// PENTA: bumped texture (it seems the previous one never got fixed anyway)
//static	unsigned char	glosspix[1024*1024];	// PENTA: bumped texture (it seems the previous one never got fixed anyway)

	int			i, s;
	qboolean	noalpha;
	int			p;
	FILE		*f;
	char filename[MAX_OSPATH];
	byte		r, g, b;
	s = width*height;

	//try to load an overrided texture

	GL_GetOverrideName(identifier,"",filename);	
	if ( LoadTextureInPlace(filename, 4, (unsigned char*)&trans[0], &width, &height) )
	{
		Con_DPrintf("Overriding colormap for %s\n",identifier);

		is_overriden = true;
		//force it to upload a 32 bit texture
		alpha = true;

		for (i=0; i<width*height; i++) {
			r = (trans[i] & RED_MASK) >> 16;
			g = (trans[i] & GREEN_MASK) >> 8;
			b = (trans[i] & BLUE_MASK);
			bumppix[i] = (r+g+b)/3;
		}
	}
	// if there are no transparent pixels, make it a 3 component
	// texture even if it was specified as otherwise
	else if (alpha)
	{
		is_overriden = false;

		noalpha = true;
		for (i=0 ; i<s ; i++)
		{
			p = data[i];
			if (p == 255)
				noalpha = false;
			trans[i] = d_8to24table[p];
			//PENTA: Grayscale for autobumps
			bumppix[i] = d_8to8graytable[p];
		}

		if (alpha && noalpha)
			alpha = false;
	}
	else
	{
		is_overriden = false;

		if (s&3)
			Sys_Error ("GL_Upload8: 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]];
			//PENTA: Grayscale for autobumps
			bumppix[i] = d_8to8graytable[data[i]];
			bumppix[i+1] = d_8to8graytable[data[i+1]];
			bumppix[i+2] = d_8to8graytable[data[i+2]];
			bumppix[i+3] = d_8to8graytable[data[i+3]];
		}
	}

	if (!strcmp("scrap",identifier)) {
		GL_Upload32 (trans, width, height, mipmap, alpha);
		return;
	}

	//upload color map
	GL_Bind(texture_extension_number);

	GL_Upload32 (trans, width, height, mipmap, alpha);

	texture_extension_number++;

	//Disable Bumpmapping parameter and now bumpmap cvar slightly
	//works. this only prevents textures from loading, but if it
	//has already loaded bumpmaps will not turn off) - Eradicator
	if (!COM_CheckParm("-nobumpmaps") && ( sh_bumpmaps.value ) && bump )
	{
	    //upload bump map (if any)
	    char filename[MAX_OSPATH];

	    GL_Bind(texture_extension_number);
	    // first check for normal map
	    GL_GetOverrideName(identifier,"_norm",filename);
	    if ( LoadTextureInPlace(filename, 4, (unsigned char*)&trans[0], &width, &height) )
	    {
		char filename[MAX_OSPATH];
		int gloss_width, gloss_height;
		Con_DPrintf("Overriding normal map for %s\n",identifier);

		GL_GetOverrideName(identifier,"_gloss",filename);
		if ( LoadTextureInPlace(filename, 1, &glosspix[0], &gloss_width, &gloss_height) )
		{
		    Con_DPrintf("Using gloss map for %s\n",identifier);
		}
		else
		{
		    //set some gloss by default
		    gloss_width = width;
		    gloss_height = height;
		    Q_memset(&glosspix[0], 255*gl_gloss.value, width*height);
		}
		
		if ((gloss_width == width) && (gloss_height == height))
		{
		    GL_PackGloss(glosspix, trans, width*height);
		}
		else
		{
		    Con_SafePrintf("Error loading gloss map %s: Gloss map bust be the same size as normal map\n", identifier);
		}
		GL_UploadNormal (trans, width, height, mipmap);
	    }
	    else
	    {
		//See if we can override the bump map
		GL_GetOverrideName(identifier,"_bump",filename);
		//See if we can override the bump map
		if ( LoadTextureInPlace(filename, 1, &bumppix[0], &width, &height) )
		{
		    char filename[MAX_OSPATH];
		    int gloss_width, gloss_height;
		    Con_DPrintf("Overriding bumpmap for %s\n",identifier);
		    GL_GetOverrideName(identifier,"_gloss",filename);
		    if ( LoadTextureInPlace(filename, 1, &glosspix[0], &gloss_width, &gloss_height) )
		    {
			Con_DPrintf("Using gloss map for %s\n",identifier);
		    }
		    else
		    {
			//set some gloss by default
			gloss_width = width;
			gloss_height = height;
			Q_memset(&glosspix[0], 255*gl_gloss.value, width*height);
		    }
		
		    if ((gloss_width == width) && (gloss_height == height))
		    {
		    }
		    else
		    {
			Con_SafePrintf("Error loading gloss map %s: Gloss map bust be the same size as bump map\n", identifier);
                        Q_memset(&glosspix[0], 255*gl_gloss.value, width*height);
		    }
		}
                else
                {
                    Q_memset(&glosspix[0], 255*gl_gloss.value, width*height);

                }
		GL_UploadBump (bumppix, width, height, mipmap, &glosspix[0]);
	    }
	}
	texture_extension_number++;
}

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

	// 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 (width != glt->width || height != glt->height)
					Con_Printf ("%s: warning: cache mismatch\n",identifier);
				//Con_Printf("reuse: %s\n",identifier);
				return gltextures[i].texnum;
			}
		}
	}
	//else {
		glt = &gltextures[numgltextures];
		numgltextures++;
	//}

	//Con_Printf("Load texture: %s %i %i\n",identifier,width,height);

	strncpy (glt->identifier, identifier, sizeof(glt->identifier));
	glt->texnum = texture_extension_number;
	glt->width = width;
	glt->height = height;
	glt->mipmap = mipmap;

	GL_Bind(texture_extension_number );

	GL_Upload8 (data, identifier, width, height, mipmap, alpha, bump);

	//texture_extension_number++;

	return texture_extension_number-2;
}

/*
================
GL_CacheTexture

  Loads a texture
================
*/
gltexture_t *GL_CacheTexture (char *filename,  qboolean mipmap, int type)
{
	int			i, width, height , gwidth, gheight;
	gltexture_t	*glt;
	char filenameext[MAX_OSPATH];
	char glossfilenameext[MAX_OSPATH];
	char buff[MAX_OSPATH];

	// see if the texture is allready present
	if (filename[0])
	{
		for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
		{
			if (!strcmp (filename, glt->identifier) && (glt->mipmap == mipmap))
			{
				//found one, return it...
				return &gltextures[i];
			}
		}
	}

	// load a new one
	glt = &gltextures[numgltextures];
	numgltextures++;
	//Con_Printf("Load texture: %s %i %i\n",identifier,width,height);

	strncpy (glt->identifier, filename, sizeof(glt->identifier));
	glt->texnum = texture_extension_number;
	texture_extension_number++;
	glt->mipmap = mipmap;
	glt->dynamic = NULL;

	if (!strcmp(filename,"$white")) {
		//a uniform white texture
		trans[0] = LittleLong ((255 << 24)|(255 << 16)|(255 << 8)|(255));
		width = height = 1;
	} else if (!strcmp(filename,"$flat")) {
		//a flat normal map with no gloss
		trans[0] = LittleLong ((0 << 24)|(127 << 16)|(255 << 8)|(127));
		width = height = 1;
	} else if (!strcmp(COM_FileExtension(filename),"roq")) {
		Con_Printf("Loading video texture from %s\n",filename);
		Roq_SetupTexture(glt, filename) ;
		return glt;
	} else {
		int rez;
		qboolean hasgloss = false;
		//has it a packed gloss too?
		if (type == TEXTURE_NORMAL && strstr(filename,"|")) {
			//uck hacky, string code from penta!
			//but strtok kills the buffer it works on!
			char b[MAX_QPATH*2+1];
			strcpy(b,filename);
			strcpy(filenameext,strtok(b,"|"));
			strcpy(glossfilenameext,strtok(NULL,"|"));

			//load the gloss
			rez = LoadTextureInPlace(glossfilenameext, 1, (unsigned char*)&glosspix[0], &gwidth, &gheight);
			if (!rez) {
				trans[0] = LittleLong ((255 << 24)|(255 << 16)|(255 << 8)|(255));
				width = height = 1;
				Con_Printf("Texture not found %s\n",glossfilenameext);
			} else hasgloss = true;
		} else {
			strcpy(filenameext,filename);
		}
		
		rez = LoadTextureInPlace(filenameext, 4, (unsigned char*)&trans[0], &width, &height);
		if (!rez) {
			trans[0] = LittleLong ((255 << 24)|(255 << 16)|(255 << 8)|(255));
			width = height = 1;
			Con_Printf("Texture not found %s\n",filenameext);
		}

		if (hasgloss) {
			if ((gwidth != width) || (gheight != height)) {
				Con_Printf("\002Warning: %s Gray gloss map must have same size as normal map\n",glossfilenameext);
			}
			GL_PackGloss(glosspix, trans, width*height);
		}
	}

	GL_Bind(glt->texnum);
	glt->width = width;
	glt->height = height;

	if (type == TEXTURE_RGB) {
		GL_Upload32 (&trans[0], width, height,  mipmap, true);
		glt->type = GL_TEXTURE_2D;
	} else if (type == TEXTURE_NORMAL) {
		GL_UploadNormal(&trans[0], width, height,  mipmap);
		glt->type = GL_TEXTURE_2D;
	};

	//texture_extension_number++;

	return glt;
}

void GL_ShutdownTextures(void) {
	int i;
	gltexture_t *glt;

	for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
	{
		//found one, return it...
		if (gltextures[i].dynamic) {
			Roq_FreeTexture(&gltextures[i]);
		}
	}
}

void Print_Tex_Cache_f(void) {
	int i;
	gltexture_t *glt;

	for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
	{
		//found one, return it...
		Con_Printf("%s: texnum(%i) type(%i) dynamic(%i) width(%i) heigt(%i)\n",
			glt->identifier, glt->texnum, glt->type, (glt->dynamic == NULL ? 0 : 1), glt->width, glt->height);

	}
}

/*
int GL_LoadLuma(char *identifier, qboolean mipmap)
{
	qboolean	alpha;
	FILE		*f;
	char filename[MAX_OSPATH];
	int			width, height;

        if ( willi_gray_colormaps.value )
            return 0;

	//try to load an overrided texture
	GL_GetOverrideName(identifier,"_luma",filename);	
	if ( LoadTextureInPlace(filename, 4, (unsigned char*)&trans[0], &width, &height) )
	{

		Con_DPrintf("Using luma map for %s\n",identifier);

		is_overriden = true;
		//force it to upload a 32 bit texture
		alpha = true;

		GL_Bind(texture_extension_number);
		GL_Upload32 (trans, width, height, mipmap, alpha);
		texture_extension_number++;
		return texture_extension_number-1;
	} else {
		return 0;
	}
}
*/

char *face_names[] =
{
	"posx",
	"negx",
	"posy",
	"negy",
	"posz",
	"negz",
};

/*
================
GL_LoadCubeMap
================
*/
int GL_LoadCubeMap (int identifier)
{
	int			i, width, height;
	gltexture_t	*glt;
	FILE		*f;
	char filename[MAX_OSPATH];
        int			texturemode;

        if ( gl_texcomp && ((int)gl_compress_textures.value) & 4 )
        {   
            texturemode = GL_COMPRESSED_RGBA_ARB;
        }
        else
        {
            texturemode = GL_RGBA;
        }

	width = 0;
	height = 0;
	// see if the texture is allready present
	//Con_Printf("Texnum %i\n",numgltextures);
	sprintf(filename,"cubemaps/%i", identifier);

	if (filename[0])
	{
		for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
		{
			if (!strcmp (filename, glt->identifier))
			{
				//Con_Printf("Found cubemap: %s %i\n",identifier,i);
				return gltextures[i].texnum;
			}
		}
	}
	//else {
		glt = &gltextures[numgltextures];
		numgltextures++;
	strncpy (glt->identifier, filename,sizeof(glt->identifier));

		//Con_Printf("Texnum2 %i\n",numgltextures);
	//}

//	Con_Printf("Loading cubemap from: %i %i\n",identifier,numgltextures);
	glEnable(GL_TEXTURE_CUBE_MAP_ARB);
	glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, texture_extension_number);
	glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
	glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
	glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	
	for (i = 0; i < 6; i++) 
	{
		sprintf(filename,"cubemaps/%i%s.tga", identifier, face_names[i]);	
		LoadTextureInPlace(filename, 4, (unsigned char*)&trans[0], &width, &height);
		glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB+i, 0, texturemode, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, &trans[0]);
	}
	
	//glEnable(GL_TEXTURE_2D);
	glDisable(GL_TEXTURE_CUBE_MAP_ARB);

	glt->texnum = texture_extension_number;
	glt->width = width;
	glt->height = height;
	glt->mipmap = false;
	glt->type = GL_TEXTURE_CUBE_MAP_ARB;

	texture_extension_number++;

	return texture_extension_number-1;
}

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

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

static GLenum oldtarget = GL_TEXTURE0_ARB;

void GL_SelectTexture (GLenum target) 
{
	if (!gl_mtexable)
		return;
	qglActiveTextureARB(target);
	if (target == oldtarget) 
		return;
	cnttextures[oldtarget-GL_TEXTURE0_ARB] = currenttexture;
	currenttexture = cnttextures[target-GL_TEXTURE0_ARB];
	oldtarget = target;
}

#define ATTEN_VOLUME_SIZE 64

float sqr(float p) {
	return p*p;
}

/*
===============
PENTA:

Load texture for 2d atten
===============
*/
int GL_Load2DAttenTexture(void)
{

	float centerx, centery, radiussq;
	int s,t, err;
	byte *data;

	data = malloc(ATTEN_VOLUME_SIZE*ATTEN_VOLUME_SIZE);
        if (!data) return 0;							// <AWE> check memory here!

	centerx = ATTEN_VOLUME_SIZE/2.0;
	centery = ATTEN_VOLUME_SIZE/2.0;
	radiussq = ATTEN_VOLUME_SIZE/2.0;
	radiussq = radiussq*radiussq;

	for (s = 0; s < ATTEN_VOLUME_SIZE; s++) {
		for (t = 0; t < ATTEN_VOLUME_SIZE; t++) {
			float DistSq = sqr(s-centerx)+sqr(t-centery);
			if (DistSq < radiussq) {
				byte value;
				float FallOff = (radiussq - DistSq) / radiussq;
				FallOff *= FallOff;
				value = FallOff*255.0;
				data[t * ATTEN_VOLUME_SIZE + s] = value;
			} else {
				data[t * ATTEN_VOLUME_SIZE + s] = 0;
			}
		}
	}

	GL_Bind(texture_extension_number);

	glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, ATTEN_VOLUME_SIZE, ATTEN_VOLUME_SIZE,
					0, GL_ALPHA, GL_UNSIGNED_BYTE, data);

	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);	

	free(data);	
	texture_extension_number++;

	err  = glGetError();

	if (err != GL_NO_ERROR) {
		Con_Printf("%s",gluErrorString(err));
	}

	return texture_extension_number-1;
}

/*
===============
PENTA:

Load texture for 3d atten (on gf3)
===============
*/
int GL_Load3DAttenTexture(void)
{

	float centerx, centery, centerz, radiussq;
	int s,t,r, err;
	byte *data;

	if (gl_cardtype == GENERIC || gl_cardtype == GEFORCE) return 0;//PA:

	data = malloc(ATTEN_VOLUME_SIZE*ATTEN_VOLUME_SIZE*ATTEN_VOLUME_SIZE*4);
        if (!data) return 0;							// <AWE> check memory here!
        
	centerx = ATTEN_VOLUME_SIZE/2.0;
	centery = ATTEN_VOLUME_SIZE/2.0;
	centerz = ATTEN_VOLUME_SIZE/2.0;
	radiussq = ATTEN_VOLUME_SIZE/2.0;
	radiussq = radiussq*radiussq;

	for (s = 0; s < ATTEN_VOLUME_SIZE; s++) {
		for (t = 0; t < ATTEN_VOLUME_SIZE; t++) {
			for (r = 0; r < ATTEN_VOLUME_SIZE; r++) {
				float DistSq = sqr(s-centerx)+sqr(t-centery)+sqr(r-centerz);
				if (DistSq < radiussq) {
					byte value;
					float FallOff = (radiussq - DistSq) / radiussq;
					//FallOff *= FallOff;
					value = FallOff*255.0;
					data[r * ATTEN_VOLUME_SIZE * ATTEN_VOLUME_SIZE *4+ t * ATTEN_VOLUME_SIZE *4+ s *4+ 0] = value;
					data[r * ATTEN_VOLUME_SIZE * ATTEN_VOLUME_SIZE *4+ t * ATTEN_VOLUME_SIZE *4+ s *4+ 1] = value;
					data[r * ATTEN_VOLUME_SIZE * ATTEN_VOLUME_SIZE *4+ t * ATTEN_VOLUME_SIZE *4+ s *4+ 2] = value;
					data[r * ATTEN_VOLUME_SIZE * ATTEN_VOLUME_SIZE *4+ t * ATTEN_VOLUME_SIZE *4+ s *4+ 3] = value;
				} else {
					data[r * ATTEN_VOLUME_SIZE * ATTEN_VOLUME_SIZE *4+ t * ATTEN_VOLUME_SIZE *4+ s *4+ 0] = 0;
					data[r * ATTEN_VOLUME_SIZE * ATTEN_VOLUME_SIZE *4+ t * ATTEN_VOLUME_SIZE *4+ s *4+ 1] = 0;
					data[r * ATTEN_VOLUME_SIZE * ATTEN_VOLUME_SIZE *4+ t * ATTEN_VOLUME_SIZE *4+ s *4+ 2] = 0;
					data[r * ATTEN_VOLUME_SIZE * ATTEN_VOLUME_SIZE *4+ t * ATTEN_VOLUME_SIZE *4+ s *4+ 3] = 0;
				}

			}
		}
	}

	glBindTexture(GL_TEXTURE_3D, texture_extension_number);

	qglTexImage3DEXT(GL_TEXTURE_3D, 0, 4,
					ATTEN_VOLUME_SIZE, ATTEN_VOLUME_SIZE, ATTEN_VOLUME_SIZE,
					0, GL_RGBA, GL_UNSIGNED_BYTE, data);

	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE );
	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);	

	free(data);	
	texture_extension_number++;

	err  = glGetError();

	if (err != GL_NO_ERROR) {
		Con_Printf("%s",gluErrorString(err));
	}

	return texture_extension_number-1;
}

/* 
Code from:

bumpdemo.c - glamour demo of "normal perturbation" mapping
by Nvidia

*/

void getCubeVector(int i, int cubesize, int x, int y, float *vector)
{
  float s, t, sc, tc, mag;

  s = ((float)x + 0.5f) / (float)cubesize;
  t = ((float)y + 0.5f) / (float)cubesize;
  sc = s*2.0f - 1.0f;
  tc = t*2.0f - 1.0f;

  switch (i) {
  case 0:
    vector[0] = 1.0f;
    vector[1] = -tc;
    vector[2] = -sc;
    break;
  case 1:
    vector[0] = -1.0;
    vector[1] = -tc;
    vector[2] = sc;
    break;
  case 2:
    vector[0] = sc;
    vector[1] = 1.0;
    vector[2] = tc;
    break;
  case 3:
    vector[0] = sc;
    vector[1] = -1.0;
    vector[2] = -tc;
    break;
  case 4:
    vector[0] = sc;
    vector[1] = -tc;
    vector[2] = 1.0;
    break;
  case 5:
    vector[0] = -sc;
    vector[1] = -tc;
    vector[2] = -1.0;
    break;
  }

  mag = 1.0f/sqrt(vector[0]*vector[0] + vector[1]*vector[1] + vector[2]*vector[2]);
  vector[0] *= mag;
  vector[1] *= mag;
  vector[2] *= mag;
}

#define NC_SIZE 128//Size of the cube faces

int GL_LoadNormalizationCubemap()
{
	vec3_t vec;
	int i, x, y;
	char pixels [NC_SIZE*NC_SIZE*3];

	glEnable(GL_TEXTURE_CUBE_MAP_ARB);
	glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, texture_extension_number);
	glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
	glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
	glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

	for (i = 0; i < 6; i++) {
		for (y = 0; y < NC_SIZE; y++) {
			for (x = 0; x < NC_SIZE; x++) 
			{
				getCubeVector(i, NC_SIZE, x, y, vec);
				pixels[3*(y*NC_SIZE+x) + 0] = (unsigned char)(128 + 127*vec[0]);
				pixels[3*(y*NC_SIZE+x) + 1] = (unsigned char)(128 + 127*vec[1]);
				pixels[3*(y*NC_SIZE+x) + 2] = (unsigned char)(128 + 127*vec[2]);
			}
		}
		glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB+i, 0, GL_RGB8, NC_SIZE, NC_SIZE, 0, GL_RGB, GL_UNSIGNED_BYTE, &pixels);
	}
	
	glDisable(GL_TEXTURE_CUBE_MAP_ARB);
	texture_extension_number++;
	return texture_extension_number-1;
}