/*
=================
R_DrawSkyChain
=================
*/
void R_DrawSkyChain (msurface_t *s)
{
msurface_t *fa;
// note: 3dfx doesn't like GL_DECAL
if (!is_3dfx && gl_multitexture.integer && gl_mtexable)
{
for (fa = s ; fa ; fa = fa->texturechain)
EmitSkyPolysMulti (fa);
return;
}
GL_Bind(solidskytexture);
speedscale = realtime*8;
speedscale -= (int)speedscale & ~127;
for (fa = s ; fa ; fa = fa->texturechain)
EmitSkyPolys (fa);
glEnable_fp (GL_BLEND);
glTexEnvf_fp(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glColor4f_fp(1.0f, 1.0f, 1.0f, r_skyalpha.value);
GL_Bind (alphaskytexture);
speedscale = realtime*16;
speedscale -= (int)speedscale & ~127;
for (fa = s ; fa ; fa = fa->texturechain)
EmitSkyPolys (fa);
glDisable_fp (GL_BLEND);
glTexEnvf_fp(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
}
/*
===============
EmitBothSkyLayers
Does a sky warp on the pre-fragmented glpoly_t chain
This will be called for brushmodels, the world
will have them chained together.
===============
*/
void EmitBothSkyLayers (msurface_t *fa)
{
// note: 3dfx doesn't like GL_DECAL
if (!is_3dfx && gl_multitexture.integer && gl_mtexable)
{
EmitSkyPolysMulti (fa);
return;
}
GL_Bind(solidskytexture);
speedscale = realtime*8;
speedscale -= (int)speedscale & ~127;
EmitSkyPolys (fa);
glEnable_fp (GL_BLEND);
glTexEnvf_fp(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glColor4f_fp(1.0f, 1.0f, 1.0f, r_skyalpha.value);
GL_Bind (alphaskytexture);
speedscale = realtime*16;
speedscale -= (int)speedscale & ~127;
EmitSkyPolys (fa);
glDisable_fp (GL_BLEND);
glTexEnvf_fp(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
}
void R_DrawParticles (void)
{
int i, color;
particle_t *p;
float scale;
#define SCALE_BASE ((p->type == pt_snow) ? p->count/10 : 1)
GL_Bind(particletexture);
glEnable_fp (GL_BLEND);
glTexEnvf_fp(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glBegin_fp (GL_TRIANGLES);
VectorScale (vup, 1.5, r_pup);
VectorScale (vright, 1.5, r_pright);
for (p = active_particles ; p ; p = p->next)
{
// hack a scale up to keep particles from disapearing
scale = (p->org[0] - r_origin[0])*vpn[0] +
(p->org[1] - r_origin[1])*vpn[1] +
(p->org[2] - r_origin[2])*vpn[2];
if (scale < 20)
scale = SCALE_BASE;
else
scale = SCALE_BASE + scale * 0.004;
/* clamp color to 0-511: particle->type 10 and 11 (pt_c_explode
* and pt_c_explode2, e.g. Crusader's ice particles hitting a
* wall) lead to negative values, because R_UpdateParticles ()
* decrements their color against time. */
color = ((int)p->color) & 0x01ff;
if (color < 256)
glColor3ubv_fp ((byte *)&d_8to24table[color]);
else
glColor4ubv_fp ((byte *)&d_8to24TranslucentTable[color-256]);
// setup texture coordinates
i = 0;
if (p->type == pt_snow)
{
if (p->count >= 69)
i = 3; // happy snow!
else if (p->count >= 40)
i = 2;
else if (p->count >= 30)
i = 1;
}
glTexCoord2fv_fp (ptex_coord[i][0]);
glVertex3fv_fp (p->org);
glTexCoord2fv_fp (ptex_coord[i][1]);
glVertex3f_fp (p->org[0] + r_pup[0]*scale, p->org[1] + r_pup[1]*scale, p->org[2] + r_pup[2]*scale);
glTexCoord2fv_fp (ptex_coord[i][2]);
glVertex3f_fp (p->org[0] + r_pright[0]*scale, p->org[1] + r_pright[1]*scale, p->org[2] + r_pright[2]*scale);
}
glEnd_fp ();
glDisable_fp (GL_BLEND);
glTexEnvf_fp(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
}
void R_DrawSkyBox (void)
{
int i;
#if 0
glEnable_fp (GL_BLEND);
glTexEnvf_fp(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glColor4f_fp (1,1,1,0.5);
glDisable_fp (GL_DEPTH_TEST);
#endif
for (i = 0; i < 6; i++)
{
if ( (skymins[0][i] >= skymaxs[0][i]) || (skymins[1][i] >= skymaxs[1][i]) )
continue;
GL_Bind(sky_tex[skytexorder[i]]);
#if 0
skymins[0][i] = -1;
skymins[1][i] = -1;
skymaxs[0][i] = 1;
skymaxs[1][i] = 1;
#endif
glBegin_fp (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_fp ();
}
#if 0
glDisable_fp (GL_BLEND);
glTexEnvf_fp(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glColor4f_fp (1,1,1,0.5);
glEnable_fp (GL_DEPTH_TEST);
#endif
}
/*
=============
EmitSkyPolys
=============
*/
static void EmitSkyPolysMulti (msurface_t *fa)
{
glpoly_t *p;
float *v;
int i;
float s, ss, t, tt;
vec3_t dir;
float length;
glTexEnvf_fp(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
GL_Bind (solidskytexture);
glActiveTextureARB_fp (GL_TEXTURE1_ARB);
glTexEnvf_fp(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
glEnable_fp(GL_TEXTURE_2D);
GL_Bind (alphaskytexture);
for (p = fa->polys ; p ; p = p->next)
{
glBegin_fp (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 = dir[0]*dir[0] + dir[1]*dir[1] + dir[2]*dir[2];
length = sqrt (length);
length = 6*63/length;
dir[0] *= length;
dir[1] *= length;
s = (realtime*8 + dir[0]) * (1.0/128);
t = (realtime*8 + dir[1]) * (1.0/128);
ss = (realtime*16 + dir[0]) * (1.0/128);
tt = (realtime*16 + dir[1]) * (1.0/128);
glMultiTexCoord2fARB_fp (GL_TEXTURE0_ARB, s, t);
glMultiTexCoord2fARB_fp (GL_TEXTURE1_ARB, ss, tt);
glVertex3fv_fp (v);
}
glEnd_fp ();
}
glDisable_fp(GL_TEXTURE_2D);
glActiveTextureARB_fp (GL_TEXTURE0_ARB);
}
