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gl_warp.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_warp.c -- sky and water polygons
#include "quakedef.h"
#include "vx_stuff.h"
#include "gl_model.h"
#include "gl_local.h"
#include "teamplay.h"
#include "utils.h"
extern model_t *loadmodel;
extern msurface_t *skychain;
extern msurface_t **skychain_tail;
//ISUNDERWATER(TruePointContents(start)
extern cvar_t r_fastturb;
int solidskytexture, alphaskytexture;
static float speedscale, speedscale2; // for top sky and bottom sky
static msurface_t *warpface;
qbool r_skyboxloaded;
void BoundPoly (int numverts, float *verts, vec3_t mins, vec3_t maxs) {
int i, j;
float *v;
mins[0] = mins[1] = mins[2] = 9999;
maxs[0] = maxs[1] = maxs[2] = -9999;
v = verts;
for (i=0 ; i<numverts ; i++) {
for (j = 0; j < 3; j++, v++) {
if (*v < mins[j])
mins[j] = *v;
if (*v > maxs[j])
maxs[j] = *v;
}
}
}
void SubdividePolygon (int numverts, float *verts) {
int i, j, k, f, b;
vec3_t mins, maxs, front[64], back[64];
float m, *v, dist[64], frac, s, t;
glpoly_t *poly;
float subdivide_size;
if (numverts > 60)
Sys_Error ("numverts = %i", numverts);
subdivide_size = max(1, gl_subdivide_size.value);
BoundPoly (numverts, verts, mins, maxs);
for (i = 0; i < 3; i++) {
m = (mins[i] + maxs[i]) * 0.5;
m = subdivide_size * floor (m / subdivide_size + 0.5);
if (maxs[i] - m < 8)
continue;
if (m - mins[i] < 8)
continue;
// cut it
v = verts + i;
for (j = 0; j < numverts; j++, v += 3)
dist[j] = *v - m;
// wrap cases
dist[j] = dist[0];
v -= i;
VectorCopy (verts, v);
f = b = 0;
v = verts;
for (j = 0; j < numverts; j++, v += 3) {
if (dist[j] >= 0) {
VectorCopy (v, front[f]);
f++;
}
if (dist[j] <= 0) {
VectorCopy (v, back[b]);
b++;
}
if (dist[j] == 0 || dist[j + 1] == 0)
continue;
if ( (dist[j] > 0) != (dist[j + 1] > 0) ) {
// clip point
frac = dist[j] / (dist[j] - dist[j + 1]);
for (k = 0; k < 3; k++)
front[f][k] = back[b][k] = v[k] + frac * (v[3 + k] - v[k]);
f++;
b++;
}
}
SubdividePolygon (f, front[0]);
SubdividePolygon (b, back[0]);
return;
}
poly = (glpoly_t *) Hunk_Alloc (sizeof(glpoly_t) + (numverts - 4) * VERTEXSIZE * sizeof(float));
poly->next = warpface->polys;
warpface->polys = poly;
poly->numverts = numverts;
for (i = 0; i < numverts; i++, verts += 3) {
VectorCopy (verts, poly->verts[i]);
s = DotProduct (verts, warpface->texinfo->vecs[0]);
t = DotProduct (verts, warpface->texinfo->vecs[1]);
poly->verts[i][3] = s;
poly->verts[i][4] = t;
}
}
// Breaks a polygon up along axial 64 unit boundaries so that turbulent and sky warps can be done reasonably.
void GL_SubdivideSurface (msurface_t *fa) {
vec3_t verts[64];
int numverts, i, lindex;
float *vec;
warpface = fa;
// convert edges back to a normal polygon
numverts = 0;
for (i = 0; i < fa->numedges; i++) {
lindex = loadmodel->surfedges[fa->firstedge + i];
if (lindex > 0)
vec = loadmodel->vertexes[loadmodel->edges[lindex].v[0]].position;
else
vec = loadmodel->vertexes[loadmodel->edges[-lindex].v[1]].position;
VectorCopy (vec, verts[numverts]);
numverts++;
}
SubdividePolygon (numverts, verts[0]);
}
// Just build the gl polys, don't subdivide
void GL_BuildSkySurfacePolys (msurface_t *fa)
{
vec3_t verts[64];
int numverts;
int i;
int lindex;
float *vec;
glpoly_t *poly;
float *vert;
//
// convert edges back to a normal polygon
//
numverts = 0;
for (i=0 ; i<fa->numedges ; i++)
{
lindex = loadmodel->surfedges[fa->firstedge + i];
if (lindex > 0)
vec = loadmodel->vertexes[loadmodel->edges[lindex].v[0]].position;
else
vec = loadmodel->vertexes[loadmodel->edges[-lindex].v[1]].position;
VectorCopy (vec, verts[numverts]);
numverts++;
}
poly = Hunk_Alloc (sizeof(glpoly_t) + (numverts-4) * VERTEXSIZE*sizeof(float));
poly->next = NULL;
fa->polys = poly;
poly->numverts = numverts;
vert = verts[0];
for (i=0 ; i<numverts ; i++, vert+= 3)
VectorCopy (vert, poly->verts[i]);
}
#define TURBSINSIZE 128
#define TURBSCALE ((float) TURBSINSIZE / (2 * M_PI))
byte turbsin[TURBSINSIZE] = {
127, 133, 139, 146, 152, 158, 164, 170, 176, 182, 187, 193, 198, 203, 208, 213,
217, 221, 226, 229, 233, 236, 239, 242, 245, 247, 249, 251, 252, 253, 254, 254,
255, 254, 254, 253, 252, 251, 249, 247, 245, 242, 239, 236, 233, 229, 226, 221,
217, 213, 208, 203, 198, 193, 187, 182, 176, 170, 164, 158, 152, 146, 139, 133,
127, 121, 115, 108, 102, 96, 90, 84, 78, 72, 67, 61, 56, 51, 46, 41,
37, 33, 28, 25, 21, 18, 15, 12, 9, 7, 5, 3, 2, 1, 0, 0,
0, 0, 0, 1, 2, 3, 5, 7, 9, 12, 15, 18, 21, 25, 28, 33,
37, 41, 46, 51, 56, 61, 67, 72, 78, 84, 90, 96, 102, 108, 115, 121,
};
__inline static float SINTABLE_APPROX(float time) {
float sinlerpf, lerptime, lerp;
int sinlerp1, sinlerp2;
sinlerpf = time * TURBSCALE;
sinlerp1 = floor(sinlerpf);
sinlerp2 = sinlerp1 + 1;
lerptime = sinlerpf - sinlerp1;
lerp = turbsin[sinlerp1 & (TURBSINSIZE - 1)] * (1 - lerptime) +
turbsin[sinlerp2 & (TURBSINSIZE - 1)] * lerptime;
return -8 + 16 * lerp / 255.0;
}
void EmitFlatPoly (msurface_t *fa) {
glpoly_t *p;
float *v;
int i;
for (p = fa->polys; p; p = p->next) {
glBegin (GL_POLYGON);
for (i = 0, v = p->verts[0]; i < p->numverts; i++, v += VERTEXSIZE) {
glVertex3fv (v);
}
glEnd ();
}
}
void EmitFlatWaterPoly (msurface_t *fa) {
glpoly_t *p;
float *v;
int i;
vec3_t nv;
if (!amf_waterripple.value || !(cls.demoplayback || cl.spectator) || strstr(fa->texinfo->texture->name, "tele")) {
EmitFlatPoly (fa);
return;
}
for (p = fa->polys; p; p = p->next) {
glBegin (GL_POLYGON);
for (i = 0, v = p->verts[0]; i < p->numverts; i++, v += VERTEXSIZE) {
VectorCopy(v, nv);
nv[2] = v[2] + (bound(0, amf_waterripple.value, 20))*sin(v[0]*0.02+r_refdef2.time)*sin(v[1]*0.02+r_refdef2.time)*sin(v[2]*0.02+r_refdef2.time);
glVertex3fv (nv);
}
glEnd ();
}
}
//Does a water warp on the pre-fragmented glpoly_t chain
void EmitWaterPolys (msurface_t *fa) {
glpoly_t *p;
float *v, s, t, os, ot;
int i;
byte *col;
extern cvar_t r_telecolor, r_watercolor, r_slimecolor, r_lavacolor;
float wateralpha = bound((1 - r_refdef2.max_watervis), r_wateralpha.value, 1);
vec3_t nv;
GL_DisableMultitexture();
if (gl_fogenable.value)
glEnable(GL_FOG);
if (r_fastturb.value)
{
glDisable (GL_TEXTURE_2D);
if (strstr (fa->texinfo->texture->name, "water") || strstr (fa->texinfo->texture->name, "mwat")) {
col = r_watercolor.color;
}
else if (strstr (fa->texinfo->texture->name, "slime")) {
col = r_slimecolor.color;
}
else if (strstr (fa->texinfo->texture->name, "lava")) {
col = r_lavacolor.color;
}
else if (strstr (fa->texinfo->texture->name, "tele")) {
col = r_telecolor.color;
}
else {
col = (byte *) &fa->texinfo->texture->flatcolor3ub;
}
glColor3ubv (col);
// START shaman FIX /gl_turbalpha + /r_fastturb {
if (wateralpha < 1.0 && wateralpha >= 0) {
glEnable (GL_BLEND);
col[3] = wateralpha*255;
glColor4ubv (col); // 1, 1, 1, wateralpha
glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
if (wateralpha < 0.9)
glDepthMask (GL_FALSE);
}
// END shaman FIX /gl_turbalpha + /r_fastturb {
EmitFlatWaterPoly (fa);
// START shaman FIX /gl_turbalpha + /r_fastturb {
if (wateralpha < 1.0 && wateralpha >= 0) {
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glColor3ubv (color_white);
glDisable (GL_BLEND);
if (wateralpha < 0.9)
glDepthMask (GL_TRUE);
}
// END shaman FIX /gl_turbalpha + /r_fastturb {
glEnable (GL_TEXTURE_2D);
glColor3ubv (color_white);
// END shaman RFE 1022504
} else {
GL_Bind (fa->texinfo->texture->gl_texturenum);
for (p = fa->polys; p; p = p->next) {
glBegin(GL_POLYGON);
for (i = 0, v = p->verts[0]; i < p->numverts; i++, v += VERTEXSIZE) {
os = v[3];
ot = v[4];
s = os + SINTABLE_APPROX(ot * 2 + r_refdef2.time);
s *= (1.0 / 64);
t = ot + SINTABLE_APPROX(os * 2 + r_refdef2.time);
t *= (1.0 / 64);
//VULT RIPPLE : Not sure where this came from first, but I've seen in it more than one engine
//I got this one from the QMB engine though
VectorCopy(v, nv);
//Over 20 this setting gets pretty cheaty
if (amf_waterripple.value && (cls.demoplayback || cl.spectator) && !strstr (fa->texinfo->texture->name, "tele"))
nv[2] = v[2] + (bound(0, amf_waterripple.value, 20)) *sin(v[0]*0.02+r_refdef2.time)*sin(v[1]*0.02+r_refdef2.time)*sin(v[2]*0.02+r_refdef2.time);
glTexCoord2f (s, t);
glVertex3fv (nv);
}
glEnd();
}
}
if (gl_fogenable.value)
glDisable(GL_FOG);
}
//Tei, add fire to lava
void EmitParticleEffect (msurface_t *fa, void (*fun)(vec3_t nv)) {
glpoly_t *p;
float *v;//, s, t, os, ot;
int i;
vec3_t nv;
for (p = fa->polys; p; p = p->next)
{
for (i = 0, v = p->verts[0]; i < p->numverts; i++, v += VERTEXSIZE)
{
VectorCopy(v, nv);
//glVertex3fv (nv);
nv[0] += rand()%100 - 50;
nv[1] += rand()%100 - 50;
//TODO: frametime here
//if( (rand()%1000) * cls.frametime>27)//not work ok
if (rand()%100>95)
{
fun(nv);
}
}
}
}
//Tei, add fire to lava
void EmitSkyPolys (msurface_t *fa, qbool mtex) {
glpoly_t *p;
float *v, s, t, ss = 0.0, tt = 0.0, 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;
if (mtex) {
s = (speedscale + dir[0]) * (1.0 / 128);
t = (speedscale + dir[1]) * (1.0 / 128);
ss = (speedscale2 + dir[0]) * (1.0 / 128);
tt = (speedscale2 + dir[1]) * (1.0 / 128);
} else {
s = (speedscale + dir[0]) * (1.0 / 128);
t = (speedscale + dir[1]) * (1.0 / 128);
}
if (mtex) {
qglMultiTexCoord2f (GL_TEXTURE0_ARB, s, t);
qglMultiTexCoord2f (GL_TEXTURE1_ARB, ss, tt);
} else {
glTexCoord2f (s, t);
}
glVertex3fv (v);
}
glEnd ();
}
}
void R_DrawSkyChain (void) {
msurface_t *fa;
extern cvar_t gl_fogsky;
if (!skychain)
return;
GL_DisableMultitexture();
if (gl_fogenable.value && gl_fogsky.value)
glEnable(GL_FOG);
if (r_fastsky.value || cl.worldmodel->bspversion == HL_BSPVERSION) {
glDisable (GL_TEXTURE_2D);
glColor3ubv (r_skycolor.color);
for (fa = skychain; fa; fa = fa->texturechain)
EmitFlatPoly (fa);
glEnable (GL_TEXTURE_2D);
glColor3ubv (color_white);
} else {
if (gl_mtexable) {
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);
speedscale = r_refdef2.time * 8;
speedscale -= (int) speedscale & ~127;
speedscale2 = r_refdef2.time * 16;
speedscale2 -= (int) speedscale2 & ~127;
for (fa = skychain; fa; fa = fa->texturechain)
EmitSkyPolys (fa, true);
GL_DisableMultitexture();
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
} else {
GL_Bind(solidskytexture);
speedscale = r_refdef2.time * 8;
speedscale -= (int) speedscale & ~127;
for (fa = skychain; fa; fa = fa->texturechain)
EmitSkyPolys (fa, false);
glEnable (GL_BLEND);
GL_Bind (alphaskytexture);
speedscale = r_refdef2.time * 16;
speedscale -= (int) speedscale & ~127;
for (fa = skychain; fa; fa = fa->texturechain)
EmitSkyPolys (fa, false);
glDisable (GL_BLEND);
}
}
if (gl_fogenable.value && gl_fogsky.value)
glDisable(GL_FOG);
skychain = NULL;
skychain_tail = &skychain;
}
//A sky texture is 256 * 128, with the right side being a masked overlay
void R_InitSky (texture_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;
solidskytexture = GL_LoadTexture ("***solidskytexture***", 128, 128, (byte *)trans, TEX_MIPMAP, 4);
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;
}
}
alphaskytexture = GL_LoadTexture ("***alphaskytexture***", 128, 128, (byte *)trans, TEX_ALPHA | TEX_MIPMAP, 4);
}
static char *skybox_ext[MAX_SKYBOXTEXTURES] = {"rt", "bk", "lf", "ft", "up", "dn"};
int R_SetSky(char *skyname)
{
int i;
int real_width, real_height;
char *groupname;
r_skyboxloaded = false;
// set skyname to groupname if any
skyname = (groupname = TP_GetSkyGroupName(TP_MapName(), NULL)) ? groupname : skyname;
if (!skyname || !skyname[0] || strchr(skyname, '.'))
{
// Empty name or contain dot(dot causing troubles with skipping part of the name as file extenson),
// so do nothing.
return 1;
}
for (i = 0; i < MAX_SKYBOXTEXTURES; i++)
{
byte *data;
if (
(data = GL_LoadImagePixels (va("env/%s%s", skyname, skybox_ext[i]), 0, 0, 0, &real_width, &real_height))
|| (data = GL_LoadImagePixels (va("gfx/env/%s%s", skyname, skybox_ext[i]), 0, 0, 0, &real_width, &real_height))
|| (data = GL_LoadImagePixels (va("env/%s_%s", skyname, skybox_ext[i]), 0, 0, 0, &real_width, &real_height))
|| (data = GL_LoadImagePixels (va("gfx/env/%s_%s", skyname, skybox_ext[i]), 0, 0, 0, &real_width, &real_height))
)
{
skyboxtextures[i] = GL_LoadTexture(
va("skybox:%s", skybox_ext[i]),
real_width, real_height, data, TEX_NOCOMPRESS | TEX_MIPMAP, 4);
// we shold free data from GL_LoadImagePixels()
Q_free(data);
}
else
{
skyboxtextures[i] = 0; // GL_LoadImagePixels() fail to load anything
}
if (!skyboxtextures[i])
{
Com_Printf ("Couldn't load skybox \"%s\"\n", skyname);
return 1;
}
}
// everything was OK
r_skyboxloaded = true;
return 0;
}
qbool OnChange_r_skyname (cvar_t *v, char *skyname) {
if (!skyname[0]) {
r_skyboxloaded = false;
return false;
}
return R_SetSky(skyname);
}
void R_LoadSky_f(void) {
switch (Cmd_Argc()) {
case 1:
if (r_skyboxloaded)
Com_Printf("Current skybox is \"%s\"\n", r_skyname.string);
else
Com_Printf("No skybox has been set\n");
break;
case 2:
if (!strcasecmp(Cmd_Argv(1), "none"))
Cvar_Set(&r_skyname, "");
else
Cvar_Set(&r_skyname, Cmd_Argv(1));
break;
default:
Com_Printf("Usage: %s <skybox>\n", Cmd_Argv(0));
}
}
static vec3_t skyclip[6] = {
{1,1,0},
{1,-1,0},
{0,-1,1},
{0,1,1},
{1,0,1},
{-1,0,1}
};
#define skybox_range 2400.0
// 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];
j = vec_to_st[axis][0];
s = (j < 0) ? -vecs[-j -1] / dv : vecs[j-1] / dv;
j = vec_to_st[axis][1];
t = (j < 0) ? -vecs[-j -1] / dv : vecs[j-1] / dv;
if (s < skymins[0][axis])
skymins[0][axis] = s;
if (t < skymins[1][axis])
skymins[1][axis] = t;
if (s > skymaxs[0][axis])
skymaxs[0][axis] = s;
if (t > skymaxs[1][axis])
skymaxs[1][axis] = t;
}
}
#define MAX_CLIP_VERTS 64
void ClipSkyPolygon (int nump, vec3_t vecs, int stage) {
float *norm, *v, d, e, dists[MAX_CLIP_VERTS];
qbool front, back;
int sides[MAX_CLIP_VERTS], newc[2], i, j;
vec3_t newv[2][MAX_CLIP_VERTS];
if (nump > MAX_CLIP_VERTS - 2)
Sys_Error ("ClipSkyPolygon: nump > MAX_CLIP_VERTS - 2");
if (stage == 6) {
// fully clipped, so draw it
DrawSkyPolygon (nump, vecs);
return;
}
front = back = false;
norm = skyclip[stage];
for (i = 0, v = vecs; i < nump; i++, v += 3) {
d = DotProduct (v, norm);
if (d > ON_EPSILON) {
front = true;
sides[i] = SIDE_FRONT;
} else if (d < -ON_EPSILON) {
back = true;
sides[i] = SIDE_BACK;
} else {
sides[i] = SIDE_ON;
}
dists[i] = d;
}
if (!front || !back) {
// not clipped
ClipSkyPolygon (nump, vecs, stage + 1);
return;
}
// clip it
sides[i] = sides[0];
dists[i] = dists[0];
VectorCopy (vecs, (vecs + (i * 3)));
newc[0] = newc[1] = 0;
for (i = 0, v = vecs; i < nump; i++, v += 3) {
switch (sides[i]) {
case SIDE_FRONT:
VectorCopy (v, newv[0][newc[0]]);
newc[0]++;
break;
case SIDE_BACK:
VectorCopy (v, newv[1][newc[1]]);
newc[1]++;
break;
case SIDE_ON:
VectorCopy (v, newv[0][newc[0]]);
newc[0]++;
VectorCopy (v, newv[1][newc[1]]);
newc[1]++;
break;
}
if (sides[i] == SIDE_ON || sides[i + 1] == SIDE_ON || sides[i + 1] == sides[i])
continue;
d = dists[i] / (dists[i] - dists[i+1]);
for (j = 0; j < 3; j++) {
e = v[j] + d * (v[j + 3] - v[j]);
newv[0][newc[0]][j] = e;
newv[1][newc[1]][j] = e;
}
newc[0]++;
newc[1]++;
}
// continue
ClipSkyPolygon (newc[0], newv[0][0], stage + 1);
ClipSkyPolygon (newc[1], newv[1][0], stage + 1);
}
/*
=================
R_AddSkyBoxSurface
=================
*/
void R_AddSkyBoxSurface (msurface_t *fa) {
int i;
vec3_t verts[MAX_CLIP_VERTS];
glpoly_t *p;
// calculate vertex values for sky box
for (p = fa->polys; p; p = p->next) {
for (i = 0; i < p->numverts; i++)
VectorSubtract (p->verts[i], r_origin, verts[i]);
ClipSkyPolygon (p->numverts, verts[0], 0);
}
}
void MakeSkyVec (float s, float t, int axis) {
vec3_t v, b;
int j, k;
float skyrange;
skyrange = max(r_farclip.value, 4096) * 0.577; // 0.577 < 1/sqrt(3)
b[0] = s*skyrange;
b[1] = t*skyrange;
b[2] = skyrange;
for (j = 0; j < 3; j++) {
k = st_to_vec[axis][j];
v[j] = (k < 0) ? -b[-k - 1] : b[k - 1];
v[j] += r_origin[j];
}
// avoid bilerp seam
s = (s + 1) * 0.5;
t = (t + 1) * 0.5;
s = bound(1.0 / 512, s, 511.0 / 512);
t = bound(1.0 / 512, t, 511.0 / 512);
t = 1.0 - t;
glTexCoord2f (s, t);
glVertex3fv (v);
}
/*
==============
R_DrawSkyBox
==============
*/
static int skytexorder[MAX_SKYBOXTEXTURES] = {0,2,1,3,4,5};
static void R_DrawSkyBox (void)
{
int i;
for (i = 0; i < MAX_SKYBOXTEXTURES; i++)
{
if ((skymins[0][i] >= skymaxs[0][i] || skymins[1][i] >= skymaxs[1][i]))
continue;
GL_Bind (skyboxtextures[(int)bound(0, skytexorder[i], MAX_SKYBOXTEXTURES-1)]);
glBegin (GL_QUADS);
MakeSkyVec (skymins[0][i], skymins[1][i], i);
MakeSkyVec (skymins[0][i], skymaxs[1][i], i);
MakeSkyVec (skymaxs[0][i], skymaxs[1][i], i);
MakeSkyVec (skymaxs[0][i], skymins[1][i], i);
glEnd ();
}
}
static void EmitSkyVert (vec3_t v)
{
vec3_t dir;
float s, t;
float length;
VectorSubtract (v, r_origin, dir);
dir[2] *= 3; // flatten the sphere
length = VectorLength (dir);
length = 6*63/length;
dir[0] *= length;
dir[1] *= length;
s = (speedscale + dir[0]) * (1.0/128);
t = (speedscale + dir[1]) * (1.0/128);
glTexCoord2f (s, t);
glVertex3fv (v);
}
// s and t range from -1 to 1
static void MakeSkyVec2 (float s, float t, int axis, vec3_t v)
{
vec3_t b;
int j, k;
float skyrange;
skyrange = max(r_farclip.value, 4096) * 0.577; // 0.577 < 1/sqrt(3)
b[0] = s*skyrange;
b[1] = t*skyrange;
b[2] = skyrange;
for (j=0 ; j<3 ; j++)
{
k = st_to_vec[axis][j];
if (k < 0)
v[j] = -b[-k - 1];
else
v[j] = b[k - 1];
v[j] += r_origin[j];
}
}
#define SUBDIVISIONS 10
static void DrawSkyFace (int axis)
{
int i, j;
vec3_t vecs[4];
float s, t;
float fstep = 2.0 / SUBDIVISIONS;
glBegin (GL_QUADS);
for (i = 0; i < SUBDIVISIONS; i++)
{
s = (float)(i*2 - SUBDIVISIONS) / SUBDIVISIONS;
if (s + fstep < skymins[0][axis] || s > skymaxs[0][axis])
continue;
for (j = 0; j < SUBDIVISIONS; j++) {
t = (float)(j*2 - SUBDIVISIONS) / SUBDIVISIONS;
if (t + fstep < skymins[1][axis] || t > skymaxs[1][axis])
continue;
MakeSkyVec2 (s, t, axis, vecs[0]);
MakeSkyVec2 (s, t + fstep, axis, vecs[1]);
MakeSkyVec2 (s + fstep, t + fstep, axis, vecs[2]);
MakeSkyVec2 (s + fstep, t, axis, vecs[3]);
EmitSkyVert (vecs[0]);
EmitSkyVert (vecs[1]);
EmitSkyVert (vecs[2]);
EmitSkyVert (vecs[3]);
}
}
glEnd ();
}
static void R_DrawSkyDome (void)
{
int i;
GL_DisableMultitexture();
GL_Bind (solidskytexture);
speedscale = r_refdef2.time*8;
speedscale -= (int)speedscale & ~127;
for (i = 0; i < 6; i++) {
if ((skymins[0][i] >= skymaxs[0][i] || skymins[1][i] >= skymaxs[1][i]))
continue;
DrawSkyFace (i);
}
glEnable (GL_BLEND);
GL_Bind (alphaskytexture);
speedscale = r_refdef2.time*16;
speedscale -= (int)speedscale & ~127;
for (i = 0; i < 6; i++) {
if ((skymins[0][i] >= skymaxs[0][i] || skymins[1][i] >= skymaxs[1][i]))
continue;
DrawSkyFace (i);
}
}
static void ClearSky (void)
{
int i;
for (i=0 ; i<6 ; i++)
{
skymins[0][i] = skymins[1][i] = 9999;
skymaxs[0][i] = skymaxs[1][i] = -9999;
}
}
/*
==============
R_DrawSky
Draw either the classic cloudy quake sky or a skybox
==============
*/
void R_DrawSky (void)
{
msurface_t *fa;
qbool ignore_z;
extern msurface_t *skychain;
GL_DisableMultitexture ();
if (r_fastsky.value) {
glDisable (GL_TEXTURE_2D);
glColor3ubv (r_skycolor.color);
for (fa = skychain; fa; fa = fa->texturechain)
EmitFlatPoly (fa);
skychain = NULL;