quakeforge/libs/video/renderer/gl/gl_warp.c

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/*
gl_warp.c
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water polygons
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
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static const char rcsid[] =
"$Id$";
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
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#include "QF/cvar.h"
#include "QF/sys.h"
#include "r_cvar.h"
#include "r_shared.h"
#include "QF/GL/defines.h"
#include "QF/GL/funcs.h"
// speed up sin calculations - Ed
float turbsin[] = {
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# include "gl_warp_sin.h"
};
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#define TURBSCALE (256.0 / (2 * M_PI))
#define TURBFRAC (32.0 / (2 * M_PI)) // an 8th of TURBSCALE
/*
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EmitWaterPolys
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Does a water warp on the pre-fragmented glpoly_t chain
*/
void
EmitWaterPolys (msurface_t *fa)
{
float os, ot, s, t, timetemp;
float *v;
int i;
glpoly_t *p;
timetemp = r_realtime * TURBSCALE;
for (p = fa->polys; p; p = p->next) {
qfglBegin (GL_POLYGON);
for (i = 0, v = p->verts[0]; i < p->numverts; i++, v += VERTEXSIZE) {
os = turbsin[(int) (v[3] * TURBFRAC + timetemp) & 255];
ot = turbsin[(int) (v[4] * TURBFRAC + timetemp) & 255];
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s = (v[3] + ot) * (1.0 / 64.0);
t = (v[4] + os) * (1.0 / 64.0);
qfglTexCoord2f (s, t);
if (r_waterripple->value != 0) {
vec3_t nv;
VectorCopy (v, nv);
nv[2] += r_waterripple->value * os * ot * (1.0 / 64.0);
qfglVertex3fv (nv);
} else
qfglVertex3fv (v);
}
qfglEnd ();
}
}