/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2002-2009 John Fitzgibbons and others
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 -- warping animation support
#include "quakedef.h"
extern cvar_t r_drawflat;
cvar_t r_oldwater = {"r_oldwater", "1", CVAR_ARCHIVE};
cvar_t r_waterquality = {"r_waterquality", "8", CVAR_NONE};
cvar_t r_waterwarp = {"r_waterwarp", "1", CVAR_NONE};
int gl_warpimagesize;
float load_subdivide_size; //johnfitz -- remember what subdivide_size value was when this map was loaded
float turbsin[] =
{
#include "gl_warp_sin.h"
};
#define WARPCALC(s,t) ((s + turbsin[(int)((t*2)+(cl.time*(128.0/M_PI))) & 255]) * (1.0/64)) //johnfitz -- correct warp
#define WARPCALC2(s,t) ((s + turbsin[(int)((t*0.125+cl.time)*(128.0/M_PI)) & 255]) * (1.0/64)) //johnfitz -- old warp
//==============================================================================
//
// OLD-STYLE WATER
//
//==============================================================================
extern qmodel_t *loadmodel;
msurface_t *warpface;
cvar_t gl_subdivide_size = {"gl_subdivide_size", "128", CVAR_ARCHIVE};
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;
vec3_t mins, maxs;
float m;
float *v;
vec3_t front[64], back[64];
int f, b;
float dist[64];
float frac;
glpoly_t *poly;
float s, t;
if (numverts > 60)
Sys_Error ("numverts = %i", numverts);
BoundPoly (numverts, verts, mins, maxs);
for (i=0 ; i<3 ; i++)
{
m = (mins[i] + maxs[i]) * 0.5;
m = gl_subdivide_size.value * floor (m/gl_subdivide_size.value + 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->next;
warpface->polys->next = 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;
}
}
/*
================
GL_SubdivideSurface
================
*/
void GL_SubdivideSurface (msurface_t *fa)
{
vec3_t verts[64];
int i;
warpface = fa;
//the first poly in the chain is the undivided poly for newwater rendering.
//grab the verts from that.
for (i=0; i<fa->polys->numverts; i++)
VectorCopy (fa->polys->verts[i], verts[i]);
SubdividePolygon (fa->polys->numverts, verts[0]);
}
/*
================
DrawWaterPoly -- johnfitz
================
*/
void DrawWaterPoly (glpoly_t *p)
{
float *v;
int i;
if (load_subdivide_size > 48)
{
glBegin (GL_POLYGON);
v = p->verts[0];
for (i=0 ; i<p->numverts ; i++, v+= VERTEXSIZE)
{
glTexCoord2f (WARPCALC2(v[3],v[4]), WARPCALC2(v[4],v[3]));
glVertex3fv (v);
}
glEnd ();
}
else
{
glBegin (GL_POLYGON);
v = p->verts[0];
for (i=0 ; i<p->numverts ; i++, v+= VERTEXSIZE)
{
glTexCoord2f (WARPCALC(v[3],v[4]), WARPCALC(v[4],v[3]));
glVertex3fv (v);
}
glEnd ();
}
}
//==============================================================================
//
// RENDER-TO-FRAMEBUFFER WATER
//
//==============================================================================
/*
=============
R_UpdateWarpTextures -- johnfitz -- each frame, update warping textures
=============
*/
void R_UpdateWarpTextures (void)
{
texture_t *tx;
int i;
float x, y, x2, warptess;
if (r_oldwater.value || cl.paused || r_drawflat_cheatsafe || r_lightmap_cheatsafe)
return;
warptess = 128.0/CLAMP (3.0, floor(r_waterquality.value), 64.0);
for (i=0; i<cl.worldmodel->numtextures; i++)
{
if (!(tx = cl.worldmodel->textures[i]))
continue;
if (!tx->update_warp)
continue;
//render warp
GL_SetCanvas (CANVAS_WARPIMAGE);
GL_Bind (tx->gltexture);
for (x=0.0; x<128.0; x=x2)
{
x2 = x + warptess;
glBegin (GL_TRIANGLE_STRIP);
for (y=0.0; y<128.01; y+=warptess) // .01 for rounding errors
{
glTexCoord2f (WARPCALC(x,y), WARPCALC(y,x));
glVertex2f (x,y);
glTexCoord2f (WARPCALC(x2,y), WARPCALC(y,x2));
glVertex2f (x2,y);
}
glEnd();
}
//copy to texture
GL_Bind (tx->warpimage);
glCopyTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, glx, gly+glheight-gl_warpimagesize, gl_warpimagesize, gl_warpimagesize);
tx->update_warp = false;
}
//if warp render went down into sbar territory, we need to be sure to refresh it next frame
if (gl_warpimagesize + sb_lines > glheight)
Sbar_Changed ();
//if viewsize is less than 100, we need to redraw the frame around the viewport
scr_tileclear_updates = 0;
}