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gl_sky.c
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/*
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
// gl_sky.c -- sky polygons
#include "quakedef.h"
#ifndef RQM_SV_ONLY
extern msurface_t *skychain;
//extern msurface_t **skychain_tail;
static int solidskytexture, alphaskytexture;
static float speedscale_x, speedscale_y; // for top sky layer
static float speedscale2_x, speedscale2_y; // for bottom sky layer
qboolean r_skyboxloaded;
int skybox_widths[6] = {0,0,0,0,0,0};
int skybox_heights[6] = {0,0,0,0,0,0};
unsigned r_skytex_width, r_skytex_height; // JDH
extern cvar_t gl_skyclip;
//extern qboolean noclip_anglehack;
extern cvar_t r_oldsky;
#ifdef FITZWORLD
extern cvar_t r_fastworld;
#endif
/*
=====================================================================================
MH IMPROVED SKY WARP BEGIN
=====================================================================================
*/
float r_skycolor_avg[4];
int spherelist = -1;
/*
=====================================================================================
MH IMPROVED SKY WARP END
=====================================================================================
*/
/*
=============
EmitSkyPolys
=============
*/
void EmitSkyPolys (msurface_t *fa, qboolean mtex)
{
glpoly_t *p;
float *v, s, t, ss, tt, length;
int i;
vec3_t dir;
for (p = fa->polys ; p ; p = p->next)
{
glBegin (GL_POLYGON);
for (i = 0, v = p->verts[0] ; i < p->numverts ; i++, v += VERTEXSIZE)
{
VectorSubtract (v, r_origin, dir);
dir[2] *= 3; // flatten the sphere
length = VectorLength (dir);
/*length = 6 * 63 / length;
dir[0] *= length;
dir[1] *= length;*/
dir[0] *= 6 * (r_skytex_width/2 - 1) / length;
dir[1] *= 6 * (r_skytex_height/2 - 1) / length;
s = (speedscale_x + dir[0]) / (float) r_skytex_width;
t = (speedscale_y + dir[1]) / (float) r_skytex_height;
if (mtex)
{
ss = (speedscale2_x + dir[0]) / (float) r_skytex_width;
tt = (speedscale2_y + dir[1]) / (float) r_skytex_height;
qglMultiTexCoord2f (GL_TEXTURE0_ARB, s, t);
qglMultiTexCoord2f (GL_TEXTURE1_ARB, ss, tt);
}
else
{
glTexCoord2f (s, t);
}
glVertex3fv (v);
}
glEnd ();
}
}
void EmitFlatPoly (msurface_t *fa)
{
glpoly_t *p;
float *v;
int i;
// JDH: fa->samples stores the undivided poly
if (fa->samples)
p = (glpoly_t *)fa->samples;
else
p = fa->polys;
for ( ; p ; p = p->next)
{
glBegin (GL_POLYGON);
for (i = 0, v = p->verts[0] ; i < p->numverts ; i++, v += VERTEXSIZE)
glVertex3fv (v);
glEnd ();
}
}
void R_DrawSolidSkyChain (void)
{
byte col[4];
msurface_t *fa;
if (Cvar_IsDefaultValue(&r_skycolor)) // "auto"
{
glColor3fv (r_skycolor_avg);
}
else
{
StringToRGB (r_skycolor.string, col);
glColor3ubv (col);
}
GL_DisableMultitexture ();
glDisable (GL_TEXTURE_2D);
for (fa = skychain ; fa ; fa = fa->texturechain)
{
#ifdef FITZWORLD
if (!r_fastworld.value || !fa->culled)
#endif
EmitFlatPoly (fa);
}
glEnable (GL_TEXTURE_2D);
glColor3f (1, 1, 1);
}
/*
=================
R_DrawSkyChainOld
=================
*/
void R_DrawSkyChainOld (void)
{
msurface_t *fa;
float speed;
if (!skychain)
return;
if (r_skytype.value == 2)
{
R_DrawSolidSkyChain ();
}
else
{
/* if ((r_skytex_width == 128) && (r_skytex_height == 128))
{
speedscale_x = cl.time * 8;
speedscale_x -= (int)speedscale_x & ~127;
speedscale_y = speedscale_x;
speedscale2_x = cl.time * 16;
speedscale2_x -= (int)speedscale2_x & ~127;
speedscale2_y = speedscale2_x;
}
else
*/ {
speed = cl.time * (r_skytex_width/16.0);
speedscale_x = speed - ((int)speed / r_skytex_width) * r_skytex_width;
speed = cl.time * (r_skytex_height/16.0);
speedscale_y = speed - ((int)speed / r_skytex_height) * r_skytex_height;
speed = cl.time * (r_skytex_width/8.0);
speedscale2_x = speed - ((int)speed / r_skytex_width) * r_skytex_width;
speed = cl.time * (r_skytex_height/8.0);
speedscale2_y = speed - ((int)speed / r_skytex_height) * r_skytex_height;
}
if (gl_mtexable)
{
GL_DisableMultitexture ();
glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
GL_Bind (solidskytexture);
GL_EnableMultitexture ();
glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
GL_Bind (alphaskytexture);
for (fa = skychain ; fa ; fa = fa->texturechain)
{
#ifdef FITZWORLD
if (!r_fastworld.value || !fa->culled)
#endif
EmitSkyPolys (fa, true);
}
GL_DisableMultitexture ();
}
else
{
GL_Bind (solidskytexture);
for (fa = skychain ; fa ; fa = fa->texturechain)
{
#ifdef FITZWORLD
if (!r_fastworld.value || !fa->culled)
#endif
EmitSkyPolys (fa, false);
}
glEnable (GL_BLEND);
GL_Bind (alphaskytexture);
speedscale_x = speedscale2_x;
speedscale_y = speedscale2_y;
for (fa = skychain ; fa ; fa = fa->texturechain)
{
#ifdef FITZWORLD
if (!r_fastworld.value || !fa->culled)
#endif
EmitSkyPolys (fa, false);
}
glDisable (GL_BLEND);
}
}
// skychain = NULL;
// skychain_tail = &skychain;
}
/****************JDH****************/
/*
=====================================================================================
MH IMPROVED SKY WARP BEGIN
=====================================================================================
*/
/*
=================
R_DrawSkyChain
Hot damn Jethro, this sho' is purty!!!
=================
*/
void R_DrawSkyChain (void)
{
// sky scaling
float fullscale, halfscale, reducedfull, reducedhalf;
float rotateBack, rotateFore;
qboolean map_has_fog;
extern qboolean submerged;
// extern cvar_t gl_skyfog;
if (!skychain)
return;
// skychain = NULL;
// JoeQuake specific!!!
// skychain_tail = &skychain;
fullscale = bound (4096, r_farclip.value, 16384) / 4096.0;
halfscale = fullscale * 0.6; // JDH: was *0.5, but seemed too low overhead
reducedfull = fullscale * 0.9;
reducedhalf = halfscale * 0.9;
// JDH: changed realtime to cl.time so it obeys pause and cl_demospeed
rotateBack = anglemod (cl.time * 6); // JT022605 - changed from 12 to slow sky
rotateFore = anglemod (cl.time * 10); // JT022605 - changed from 20 to slow sky
map_has_fog = (Fog_GetDensity() > 0) || submerged;
if (!map_has_fog /*&& gl_skyfog.value*/) // JDH: don't mess with fog if it's already active
{
// turn on fogging. fog looks good on the skies - it gives them a more
// "airy" far-away look, and has the knock-on effect of preventing the
// old "texture distortion at the poles" problem.
// glFogi (GL_FOG_MODE, GL_LINEAR);
// glFogf (GL_FOG_START, 512); // JDH: increased from 5
// glFogf (GL_FOG_END, r_farclip.value * 0.60); // changed from 0.75
// JDH: switched to exponential fog so it's more evenly distributed across sky:
glFogi (GL_FOG_MODE, GL_EXP2); // EXP2 obscures the sky "sides" a bit more than EXP
glFogf (GL_FOG_DENSITY, 0.0005/fullscale);
// glFogf (GL_FOG_DENSITY, 0.001*gl_skyfog.value/fullscale);
// glFogfv (GL_FOG_COLOR, r_skycolor_avg);
{
// vec3_t col;
// VectorScale (r_skycolor_avg, 1.0, col);
// glFogfv (GL_FOG_COLOR, col);
glFogfv (GL_FOG_COLOR, r_skycolor_avg);
}
glEnable (GL_FOG);
}
// sky texture scaling
// previous releases made a tiled version of the sky texture. here i just shrink it using the
// texture matrix, for much the same effect
glMatrixMode (GL_TEXTURE);
glLoadIdentity ();
glScalef (4, 2, 1); // JDH: was 2,1,1 but a larger scale makes sky look further away
glMatrixMode (GL_MODELVIEW);
// background
// ==========
// go to a new matrix
glPushMatrix ();
// center it on the players position
glTranslatef (r_origin[0], r_origin[1], r_origin[2]);
// flatten the sphere
glScalef (fullscale, fullscale, halfscale);
// orient it so that the poles are unobtrusive
glRotatef (-90, 1, 0, 0);
// make it not always at right angles to the player
glRotatef (-22, 0, 1, 0);
// rotate it around the poles
glRotatef (-rotateBack, 0, 0, 1);
// solid sky texture
glBindTexture (GL_TEXTURE_2D, solidskytexture);
// draw the sphere
glCallList (spherelist);
// restore the previous matrix
glPopMatrix ();
// foreground
// ==========
// go to a new matrix
glPushMatrix ();
// center it on the players position
glTranslatef (r_origin[0], r_origin[1], r_origin[2]);
// flatten the sphere and shrink it a little - the reduced scale prevents artifacts appearing when
// corners on the skysphere may potentially overlap
glScalef (reducedfull, reducedfull, reducedhalf);
// orient it so that the poles are unobtrusive
glRotatef (-90, 1, 0, 0);
// make it not always at right angles to the player
glRotatef (-22, 0, 1, 0);
// rotate it around the poles
glRotatef (-rotateFore, 0, 0, 1);
// blend mode
glEnable (GL_BLEND);
// alpha sky texture
glBindTexture (GL_TEXTURE_2D, alphaskytexture);
// draw the sphere
glCallList (spherelist);
// back to normal mode
glDisable (GL_BLEND);
// restore the previous matrix
glPopMatrix ();
// turn off fog
if (!map_has_fog /*&& gl_skyfog.value*/)
glDisable (GL_FOG);
glMatrixMode (GL_TEXTURE);
glLoadIdentity ();
glMatrixMode (GL_MODELVIEW);
}
/*
=====================================================================================
MH IMPROVED SKY WARP END
=====================================================================================
*/
//===============================================================
/*
==============
R_DrawSphere
Draw a sphere!!! The verts and texcoords are precalculated for extra efficiency. The sphere is put into
a display list to reduce overhead even further.
==============
*/
float skytexes[440];
float skyverts[660];
void R_DrawSphere (void)
{
if (spherelist == -1)
{
int i;
int j;
int vertspos = 0;
int texespos = 0;
// build the sphere display list
spherelist = glGenLists (1);
glNewList (spherelist, GL_COMPILE);
for (i = 0; i < 10; i++)
{
glBegin (GL_TRIANGLE_STRIP);
for (j = 0; j <= 10; j++)
{
glTexCoord2fv (&skytexes[texespos]);
glVertex3fv (&skyverts[vertspos]);
texespos += 2;
vertspos += 3;
glTexCoord2fv (&skytexes[texespos]);
glVertex3fv (&skyverts[vertspos]);
texespos += 2;
vertspos += 3;
}
glEnd ();
}
glEndList ();
}
}
/*
==============
R_InitSkyChain
Initialize the sky chain arrays
==============
*/
void R_InitSkyChain (void)
{
float drho = 0.3141592653589;
float dtheta = 0.6283185307180;
float ds = 0.1;
float dt = 0.1;
float t = 1.0f;
float s = 0.0f;
int i;
int j;
int vertspos = 0;
int texespos = 0;
for (i = 0; i < 10; i++)
{
float rho = (float) i * drho;
float srho = (float) (sin (rho));
float crho = (float) (cos (rho));
float srhodrho = (float) (sin (rho + drho));
float crhodrho = (float) (cos (rho + drho));
s = 0.0f;
for (j = 0; j <= 10; j++)
{
float theta = (j == 10) ? 0.0f : j * dtheta;
float stheta = (float) (-sin( theta));
float ctheta = (float) (cos (theta));
skytexes[texespos++] = s * 2;
skytexes[texespos++] = t * 2;
skyverts[vertspos++] = stheta * srho * 4096.0;
skyverts[vertspos++] = ctheta * srho * 4096.0;
skyverts[vertspos++] = crho * 4096.0;
skytexes[texespos++] = s * 2;
skytexes[texespos++] = (t - dt) * 2;
skyverts[vertspos++] = stheta * srhodrho * 4096.0;
skyverts[vertspos++] = ctheta * srhodrho * 4096.0;
skyverts[vertspos++] = crhodrho * 4096.0;
s += ds;
}
t -= dt;
}
}
/*
=============
R_InitSky
A sky texture is 256*128, with the right side being a masked overlay
==============
*/
/*
void R_InitSky (miptex_t *mt)
{
int i, j, p, r, g, b;
byte *src;
unsigned trans[128*128], transpix, *rgba;
src = (byte *)mt + mt->offsets[0];
// make an average value for the back to avoid a fringe on the top level
r = g = b = 0;
for (i=0 ; i<128 ; i++)
for (j=0 ; j<128 ; j++)
{
p = src[i*256 + j + 128];
rgba = &d_8to24table[p];
trans[(i*128) + j] = *rgba;
r += ((byte *)rgba)[0];
g += ((byte *)rgba)[1];
b += ((byte *)rgba)[2];
}
((byte *)&transpix)[0] = r / (128 * 128);
((byte *)&transpix)[1] = g / (128 * 128);
((byte *)&transpix)[2] = b / (128 * 128);
((byte *)&transpix)[3] = 0;
if (!solidskytexture)
solidskytexture = texture_extension_number++;
GL_Bind (solidskytexture);
glTexImage2D (GL_TEXTURE_2D, 0, gl_solid_format, 128, 128, 0, GL_RGBA, GL_UNSIGNED_BYTE, trans);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
for (i=0 ; i<128 ; i++)
for (j=0 ; j<128 ; j++)
{
p = src[i*256 + j];
trans[(i * 128) + j] = p ? d_8to24table[p] : transpix;
}
if (!alphaskytexture)
alphaskytexture = texture_extension_number++;
GL_Bind (alphaskytexture);
glTexImage2D (GL_TEXTURE_2D, 0, gl_alpha_format, 128, 128, 0, GL_RGBA, GL_UNSIGNED_BYTE, trans);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
*/
/*
==================
R_LoadExtSkyTex (JDH)
==================
*/
unsigned * R_LoadExtSkyTex (const char *name)
{
char mappath[MAX_QPATH];
const char *namelist[2], *pathlist[3];
if (no24bit || isDedicated || !gl_externaltextures_world.value)
return NULL;
namelist[0] = name;
namelist[1] = NULL;
Q_snprintfz (mappath, sizeof(mappath), "textures/%s/", Host_MapName ());
pathlist[0] = mappath;
pathlist[1] = "textures/";
pathlist[2] = NULL;
return (unsigned *) GL_LoadImage_MultiSource (pathlist, namelist, 0, 0);
}
/*
=====================================================================================
MH IMPROVED SKY WARP BEGIN
=====================================================================================
*/
void R_InitSky (miptex_t *mt)
{
int width, height, size, i, j, p;
byte *src;
unsigned *data_24bit, *trans;
unsigned transpix;
int r, g, b;
unsigned *rgba;
unsigned topalpha;
int div;
data_24bit = R_LoadExtSkyTex (mt->name); // JDH
if (data_24bit)
{
width = image_width;
height = image_height;
}
else
{
width = mt->width;
height = mt->height;
src = (byte *)mt + mt->offsets[0];
}
if (width != 256 || height != 128)
Con_DPrintf ("\x02""WARNING: non-standard sky texture size will cause strange effects in most engines!\n");
// -----------------
// solid sky texture (right-hand half of texture)
// -----------------
// make an average value for the back to avoid
// a fringe on the top level
r = g = b = 0;
// JDH: changed to handle non-256x128 textures
r_skytex_width = width/2;
r_skytex_height = height;
size = r_skytex_height * r_skytex_width;
// initialize our pointers
trans = Q_malloc (size * 4);
for (i=0 ; i<r_skytex_height ; i++)
{
for (j=0 ; j<r_skytex_width ; j++)
{
if (data_24bit)
{
rgba = &data_24bit[i*width + r_skytex_width + j];
}
else
{
//p = src[i*256 + j + 128];
p = src[i*width + r_skytex_width + j];
rgba = &d_8to24table[p];
}
trans[i*r_skytex_width + j] = *rgba;
r += ((byte *)rgba)[0];
g += ((byte *)rgba)[1];
b += ((byte *)rgba)[2];
}
}
((byte *)&transpix)[0] = r/size;
((byte *)&transpix)[1] = g/size;
((byte *)&transpix)[2] = b/size;
((byte *)&transpix)[3] = 0;
if (!solidskytexture)
solidskytexture = texture_extension_number++;
glBindTexture (GL_TEXTURE_2D, solidskytexture);
glTexImage2D (GL_TEXTURE_2D, 0, gl_solid_format, r_skytex_width, r_skytex_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, trans);
// glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, r_skytex_width, r_skytex_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, trans);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// -----------------
// alpha sky texture
// -----------------
// MH: get another average cos the bottom layer average can be too dark
div = r = g = b = 0;
for (i=0 ; i<r_skytex_height ; i++)
{
for (j=0 ; j<r_skytex_width ; j++)
{
if (data_24bit)
{
// JDH: DarkPlaces uses alpha channel from image, rather than
// replacing a certain colour
rgba = &data_24bit[i*width + j];
/*if (!*rgba)
topalpha = transpix;
else
{
r += ((byte *)rgba)[0];
g += ((byte *)rgba)[1];
b += ((byte *)rgba)[2];
div++;
topalpha = *rgba;
((byte *)&topalpha)[3] = 0xD0; // 0.8 instead of 0.5
}*/
topalpha = *rgba;
}
else
{
// p = src[i*256 + j];
p = src[i*width + j];
if (p == 0)
topalpha = transpix;
else
{
rgba = &d_8to24table[p];
r += ((byte *)rgba)[0];
g += ((byte *)rgba)[1];
b += ((byte *)rgba)[2];
div++;
topalpha = *rgba;
// JDH: reduced transparency to improve distinction between layers
// in MH sky (although pixellation is more apparent now...)
//((byte *)&topalpha)[3] = ((byte *)&topalpha)[3] / 2;
// ((byte *)&topalpha)[3] = 0xD0; // 0.8 instead of 0.5
((byte *)&topalpha)[3] = 255;
}
}
trans[i*r_skytex_width + j] = topalpha;
}
}
if (!alphaskytexture) alphaskytexture = texture_extension_number++;
glBindTexture (GL_TEXTURE_2D, alphaskytexture);
glTexImage2D (GL_TEXTURE_2D, 0, gl_alpha_format, r_skytex_width, r_skytex_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, trans);
// glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, r_skytex_width, r_skytex_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, trans);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// get fog colours for the sky - we halve these
r_skycolor_avg[0] = ((float)r / (float)div) / 512.0;
r_skycolor_avg[1] = ((float)g / (float)div) / 512.0;
r_skycolor_avg[2] = ((float)b / (float)div) / 512.0;
r_skycolor_avg[3] = 0.1;
// free the used memory
free (trans);
if (data_24bit)
free (data_24bit);
// recalc the sphere display list - delete the original one first!!!
if (spherelist != -1) glDeleteLists (spherelist, 1);
spherelist = -1;
R_InitSkyChain ();
R_DrawSphere ();
}
/*
=====================================================================================
MH IMPROVED SKY WARP END
=====================================================================================
*/
/*
==================
R_SetSky
==================
*/
static const char *skybox_ext[6] = {"rt", "bk", "lf", "ft", "up", "dn"};
static const char *skybox_paths[] = {"env/", "gfx/env/", NULL};
qboolean R_SetSkybox (const char *skyname)
{
int namelen, i, j;
byte *data[6] = {NULL, NULL, NULL, NULL, NULL, NULL};
char fname1[MAX_QPATH], fname2[MAX_QPATH];
const char *namelist[3] = {fname1, fname2, NULL};
if (!skyname || !*skyname)
return false;
namelen = strlen (skyname);
if (skyname[namelen-1] == '_')
{
Q_strcpy (fname2, skyname, sizeof(fname2));
Q_strcpy (fname1, skyname, sizeof(fname1));
fname1[--namelen] = 0;
}
else
{
Q_strcpy (fname1, skyname, sizeof(fname1));
Q_snprintfz (fname2, sizeof(fname2), "%s_", skyname);
}
for (i=0 ; i<6 ; i++)
{
// append suffix for current face:
Q_strcpy (fname1 + namelen, skybox_ext[i], sizeof(fname1) - namelen);
Q_strcpy (fname2 + namelen + 1, skybox_ext[i], sizeof(fname2) - namelen - 1);
data[i] = GL_LoadImage_MultiSource (skybox_paths, namelist, 0, 0);
/*if (!(data[i] = GL_LoadImage("env/", va("%s%s", skyname, skybox_ext[i]), 0, 0)) &&
!(data[i] = GL_LoadImage("gfx/env/", va("%s%s", skyname, skybox_ext[i]), 0, 0)) &&
!(data[i] = GL_LoadImage("env/", va("%s_%s", skyname, skybox_ext[i]), 0, 0)) &&
!(data[i] = GL_LoadImage("gfx/env/", va("%s_%s", skyname, skybox_ext[i]), 0, 0)))
*/
if (!data[i])
{
Con_Printf ("Couldn't load skybox \"%s\"\n", skyname);
for (j = 0; j < i; j++)
{
free (data[j]);
skybox_widths[j] = 0;
skybox_heights[j] = 0;
}
r_skyboxloaded = false;
return false;
}
skybox_widths[i] = image_width;
skybox_heights[i] = image_height;
}
for (i=0 ; i<6 ; i++)
{
GL_Bind (skyboxtextures + i);
GL_Upload32 (NULL, (unsigned int *)data[i], &skybox_widths[i], &skybox_heights[i], 0);
free (data[i]);
}
r_skyboxloaded = true;
return true;
}
qboolean OnChange_r_skybox (cvar_t *var, const char *string)
{
int i;
if (!string[0])
{
r_skyboxloaded = false;
for (i = 0; i < 6; i++)
{
skybox_widths[i] = 0;
skybox_heights[i] = 0;
}
return false;
}
if (nehahra)
{
Cvar_SetDirect (&r_oldsky, "0");
Q_strcpy (prev_skybox, string, sizeof(prev_skybox));
}
return !R_SetSkybox (string);
}
qboolean Sky_GetBaseName (char *filename)
{
int len, i;
len = strlen (filename);
if (len < 3)
return false; // not long enough to have suffix
for (i = 0; i < 6; i++)
{
if (!Q_strcasecmp(filename+len-2, skybox_ext[i]))
break;
}
if (i == 6)
return false; // suffix doesn't match any of the 6
if ((len > 3) && (filename[len-3] == '_'))
len -= 3;
else
len -= 2;
filename[len] = 0; // cut off skybox_ext
return true;
}
/*
=============
Sky_InitWorldspawn (JDH)
called on map load, if "sky" key is found
=============
*/
qboolean Sky_InitWorldspawn (const char *value)
{
if (no24bit)
return false;
Cvar_SetDirect (&r_skybox, value);
return r_skyboxloaded;
}
static vec3_t skyclip[6] = {
{1, 1, 0},
{1, -1, 0},
{0, -1, 1},
{0, 1, 1},
{1, 0, 1},
{-1, 0, 1}
};
// 1 = s, 2 = t, 3 = 2048
static int st_to_vec[6][3] = {
{3, -1, 2},
{-3, 1, 2},
{1, 3, 2},
{-1, -3, 2},
{-2, -1, 3}, // 0 degrees yaw, look straight up
{2, -1, -3} // look straight down
};
// s = [0]/[2], t = [1]/[2]
static int vec_to_st[6][3] = {
{-2, 3, 1},
{2, 3, -1},
{1, 3, 2},
{-1, 3, -2},
{-2, -1, 3},
{-2, 1, -3}
};
static float skymins[2][6], skymaxs[2][6];
void DrawSkyPolygon (int nump, vec3_t vecs)
{
int i, j, axis;
vec3_t v, av;
float s, t, dv, *vp;
// decide which face it maps to
VectorClear (v);
for (i = 0, vp = vecs ; i < nump ; i++, vp += 3)
VectorAdd (vp, v, v);
av[0] = fabs(v[0]);
av[1] = fabs(v[1]);
av[2] = fabs(v[2]);
if (av[0] > av[1] && av[0] > av[2])
axis = (v[0] < 0) ? 1 : 0;
else if (av[1] > av[2] && av[1] > av[0])
axis = (v[1] < 0) ? 3 : 2;
else
axis = (v[2] < 0) ? 5 : 4;
// project new texture coords
for (i=0 ; i<nump ; i++, vecs+=3)
{
j = vec_to_st[axis][2];
dv = (j > 0) ? vecs[j - 1] : -vecs[-j - 1];