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tenebrae2/textures.c

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/*
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_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;
}
}
}
/*
===============
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.
}
}
#define DETAIL_NORMAL_SCALE 10.0f
//Convert the pixel at x,y in the bump map to a normal (float)
void NormalFromBump(byte *pixels, int x, int y, int w, int h, vec3_t rez)
{
float c, cx, cy, dcx, dcy, sqlen, reciplen;
float oneOver255 = 1/255.0f;
/* Expand [0,255] texel values to the [0,1] range. */
c = pixels[y*w + x] * oneOver255;
/* Expand the texel to its right. */
cx = pixels[y*w + (x+1)%w] * oneOver255;
/* Expand the texel one up. */
cy = pixels[((y+1)%h)*w + x] * oneOver255;
dcx = DETAIL_NORMAL_SCALE * (c - cx);
dcy = DETAIL_NORMAL_SCALE * (c - cy);
/* Normalize the vector. */
sqlen = dcx*dcx + dcy*dcy + 1;
reciplen = 1.0f/(float)sqrt(sqlen);
rez[0] = dcx*reciplen;
rez[1] = -dcy*reciplen;
rez[2] = reciplen;
}
/*
===============
PENTA:
===============
*/
void GL_MixDetailNormal(byte *bump, byte *dest, int w, int h)
{
int i,j;
float inv127 = 1/127.0f;
vec3_t n1, n2, tan, bin, rez, xn, yn;
vec3_t temp = {0,1.0,0};
for (i=0; i<h; i++) {
for (j=0; j<w; j++) {
//Create 2 normal vectors
n2[0] = (inv127*dest[(i*w+j)*4+0]-1.0);
n2[1] = (inv127*dest[(i*w+j)*4+1]-1.0);
n2[2] = (inv127*dest[(i*w+j)*4+2]-1.0);
NormalFromBump(bump, j, i, w, h, n1);
CrossProduct(temp,n1,tan);
CrossProduct(n1,xn,bin);
VectorNormalize(tan);
VectorNormalize(bin);
rez[0] = n2[0]*tan[0] + n2[1]*bin[0] + n2[2]*n1[0];
rez[1] = n2[0]*tan[1] + n2[1]*bin[1] + n2[2]*n1[1];
rez[2] = n2[0]*tan[2] + n2[1]*bin[2] + n2[2]*n1[2];
dest[(i*w+j)*4+0] = (unsigned char)128 + 127*rez[0];
dest[(i*w+j)*4+1] = (unsigned char)128 + 127*rez[1];
dest[(i*w+j)*4+2] = (unsigned char)128 + 127*rez[2];
}
}
}
/*
===============
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[1024*1024];
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);
}
unsigned trans[1024*1024]; // FIXME, temporary
static unsigned char glosspix[1024*1024];
static unsigned char detailpix[1024*1024];
#define RED_MASK 0x00FF0000
#define GREEN_MASK 0x0000FF00
#define BLUE_MASK 0x000000FF
/*
================
GL_LoadTextureFromFile
Load a cache texture from its file
================
*/
static void GL_LoadTextureFromFile(gltexture_t *glt)
{
int i, width, height, gwidth, gheight, dwidth, dheight;
char *glossname;
char *detailname;
char *basename;
char *filename = glt->identifier;
Con_DPrintf("Loading texture %s\n", glt->identifier);
if (glt->loadtype == TEXTURE_CUBEMAP) {
GL_LoadCubemapTexture(glt);
return;
}
if (!strcmp(filename,"$white")) {
//a uniform white texture
trans[0] = LittleLong ((255 << 24)|(255 << 16)|(255 << 8)|(255));
width = height = 1;
} else if (!strcmp(filename,"$black")) {
//a uniform black texture
trans[0] = LittleLong ((0 << 24)|(0 << 16)|(0 << 8)|(0));
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;
} else {
int rez;
char b[MAX_QPATH*3+2], *pb, *b2;
qboolean hasgloss = false;
qboolean hasdetailbump = false;
if (glt->loadtype == TEXTURE_NORMAL) {
strcpy(b,filename);
pb = b;
basename = b;
//Does it have a detail bumpmap
while((*pb) && ((*pb) != '+')) pb++;
if ((*pb) == '+')
{
(*pb) = 0;
pb++;
//So we found a detail bumpmap load it to the buffer (it's grayscale)
detailname = b;
basename = pb;
rez = LoadTextureInPlace(detailname, 1, (unsigned char*)&detailpix[0], &dwidth, &dheight);
if (!rez) {
dwidth = dheight = 1;
Con_Printf("Texture not found %s\n",detailname);
} else hasdetailbump = true;
}
//Does it have packed gloss?
pb = basename;
while((*pb) && ((*pb) != '|')) pb++;
if ((*pb) == '|')
{
(*pb) = 0;
pb++;
glossname = pb;
rez = LoadTextureInPlace(glossname, 1, (unsigned char*)&glosspix[0], &gwidth, &gheight);
if (!rez) {
gwidth = gheight = 1;
Con_Printf("Texture not found %s\n",glossname);
} else hasgloss = true;
}
} else {
basename = filename;
}
rez = LoadTextureInPlace(basename, 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",basename);
}
if (hasdetailbump) {
if ((dwidth != width) || (dheight != height)) {
Con_Printf("\002Warning: %s Detail normalmap must have same size as normal map\n",detailname);
}
GL_MixDetailNormal(detailpix, (unsigned char *)trans, width, height);
}
if (hasgloss) {
if ((gwidth != width) || (gheight != height)) {
Con_Printf("\002Warning: %s Gray gloss map must have same size as normal map\n",glossname);
}
GL_PackGloss(glosspix, trans, width*height);
}
}
GL_Bind(glt->texnum);
glt->width = width;
glt->height = height;
glt->gltype = GL_TEXTURE_2D;
if (glt->loadtype == TEXTURE_RGB) {
GL_Upload32 (&trans[0], width, height, glt->mipmap, true);
} else if (glt->loadtype == TEXTURE_NORMAL) {
GL_UploadNormal(&trans[0], width, height, glt->mipmap);
};
//texture_extension_number++;
return;
}
/*
================
GL_CacheTexture
Add a texture to the cache
================
*/
gltexture_t *GL_CacheTexture (char *filename, qboolean mipmap, int type)
{
gltexture_t *glt;
int i;
// 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;
glt->loadtype = type;
GL_LoadTextureFromFile(glt);
return glt;
}
/*
================
GL_ShutdownTextures
Free some memory allocated for textures
================
*/
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 ReloadTextures_f(void) {
int i;
gltexture_t *glt;
Con_Printf("=================================\n");
//Free old memory
Con_Printf("GL_ShutdownTextures...\n");
Con_Printf("Reloading textures...\n");
scr_disabled_for_loading = true;
GL_ShutdownTextures();
//Reload
for (i=0, glt=gltextures ; i<numgltextures ; i++, glt++)
{
//found one, return it...
GL_LoadTextureFromFile(glt);
}
scr_disabled_for_loading = false;
Con_Printf("=================================\n");
}
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->loadtype, (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",
};
/**
Load a cubemap into the texture cache (used for a.o. light filters)
glt contains a valid texture identifier where the map needs to be bound
glt contains a "prexix" where the cubmap files are
*/
int GL_LoadCubemapTexture (gltexture_t *glt)
{
int i, width, height;
FILE *f;
char filename[MAX_OSPATH];
int texturemode;
if ( gl_texcomp && ((int)gl_compress_textures.value) & 1)
{
texturemode = GL_COMPRESSED_RGBA_ARB;
} else {
texturemode = GL_RGBA;
}
glt->gltype = GL_TEXTURE_CUBE_MAP_ARB;
glEnable(GL_TEXTURE_CUBE_MAP_ARB);
glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, glt->texnum);
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,"%s%s.tga", glt->identifier, face_names[i]);
LoadTextureInPlace(filename, 4, (unsigned char*)&trans[0], &width, &height);
if ((width == 0) || (height == 0)) {
Con_Printf("Texture not found: %s\n",filename);
} else {
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->width = width;
glt->height = height;
glt->mipmap = false;
glt->gltype = GL_TEXTURE_CUBE_MAP_ARB;
texture_extension_number++;
return texture_extension_number-1;
}
/*
================
GL_LoadPicTexture
================
*/
int GL_LoadPicTexture (qpic_t *pic)
{
return 0; //FIXME: remove this routine
}
/****************************************/
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;
}
float sqr(float p) {
return p*p;
}
#define ATTEN_VOLUME_SIZE 64
extern qboolean gl_mirroronce;
/*
===============
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, volumeSize;
byte *data;
if (gl_cardtype == GENERIC || gl_cardtype == GEFORCE) return 0;//PA:
//Penta we need special matrix setup with the mirror once stuff so only use it if the path supports it
if (gl_mirroronce && gl_cardtype == ARB) {
volumeSize = ATTEN_VOLUME_SIZE/2;
centerx = 0.0;
centery = 0.0;
centerz = 0.0;
radiussq = ATTEN_VOLUME_SIZE/2;
radiussq = radiussq*radiussq;
} else {
volumeSize = ATTEN_VOLUME_SIZE;
centerx = volumeSize/2.0;
centery = volumeSize/2.0;
centerz = volumeSize/2.0;
radiussq = volumeSize/2.0;
radiussq = radiussq*radiussq;
}
data = malloc(volumeSize*volumeSize*volumeSize);
if (!data) return 0;
for (s = 0; s < volumeSize; s++) {
for (t = 0; t < volumeSize; t++) {
for (r = 0; r < volumeSize; 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 * volumeSize * volumeSize + t * volumeSize + s] = value;
//data[r * volumeSize * volumeSize + t * volumeSize + s *4+ 1] = value;
//data[r * volumeSize * volumeSize + t * volumeSize + s *4+ 2] = value;
//data[r * volumeSize * volumeSize + t * volumeSize + s *4+ 3] = value;
} else {
data[r * volumeSize * volumeSize + t * volumeSize + s] = 0;
//data[r * volumeSize * volumeSize + t * volumeSize + s *4+ 1] = 0;
//data[r * volumeSize * volumeSize + t * volumeSize + s *4+ 2] = 0;
//data[r * volumeSize * volumeSize + t * volumeSize + s *4+ 3] = 0;
}
}
}
}
glBindTexture(GL_TEXTURE_3D, texture_extension_number);
qglTexImage3DEXT(GL_TEXTURE_3D, 0, GL_LUMINANCE8,
volumeSize, volumeSize, volumeSize,
0, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
if (gl_mirroronce) {
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_MIRROR_CLAMP_TO_EDGE_ATI );
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_MIRROR_CLAMP_TO_EDGE_ATI );
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_MIRROR_CLAMP_TO_EDGE_ATI );
} else {
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;
}
int GL_LoadBlackTexture(void)
{
char data[4];
int err;
data[0] = data[1] = data[2] = data[3] = 0;
GL_Bind(texture_extension_number);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, 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);
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;
}
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