mirror of
https://git.code.sf.net/p/quake/quake2forge
synced 2024-11-10 15:22:16 +00:00
442 lines
8.7 KiB
C
442 lines
8.7 KiB
C
/*
|
|
Copyright (C) 1997-2001 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.
|
|
|
|
*/
|
|
// r_light.c
|
|
|
|
#include "r_local.h"
|
|
|
|
int r_dlightframecount;
|
|
|
|
|
|
/*
|
|
=============================================================================
|
|
|
|
DYNAMIC LIGHTS
|
|
|
|
=============================================================================
|
|
*/
|
|
|
|
/*
|
|
=============
|
|
R_MarkLights
|
|
=============
|
|
*/
|
|
void R_MarkLights (dlight_t *light, int bit, mnode_t *node)
|
|
{
|
|
mplane_t *splitplane;
|
|
float dist;
|
|
msurface_t *surf;
|
|
int i;
|
|
|
|
if (node->contents != -1)
|
|
return;
|
|
|
|
splitplane = node->plane;
|
|
dist = DotProduct (light->origin, splitplane->normal) - splitplane->dist;
|
|
|
|
//=====
|
|
//PGM
|
|
i=light->intensity;
|
|
if(i<0)
|
|
i=-i;
|
|
//PGM
|
|
//=====
|
|
|
|
if (dist > i) // PGM (dist > light->intensity)
|
|
{
|
|
R_MarkLights (light, bit, node->children[0]);
|
|
return;
|
|
}
|
|
if (dist < -i) // PGM (dist < -light->intensity)
|
|
{
|
|
R_MarkLights (light, bit, node->children[1]);
|
|
return;
|
|
}
|
|
|
|
// mark the polygons
|
|
surf = r_worldmodel->surfaces + node->firstsurface;
|
|
for (i=0 ; i<node->numsurfaces ; i++, surf++)
|
|
{
|
|
if (surf->dlightframe != r_dlightframecount)
|
|
{
|
|
surf->dlightbits = 0;
|
|
surf->dlightframe = r_dlightframecount;
|
|
}
|
|
surf->dlightbits |= bit;
|
|
}
|
|
|
|
R_MarkLights (light, bit, node->children[0]);
|
|
R_MarkLights (light, bit, node->children[1]);
|
|
}
|
|
|
|
|
|
/*
|
|
=============
|
|
R_PushDlights
|
|
=============
|
|
*/
|
|
void R_PushDlights (model_t *model)
|
|
{
|
|
int i;
|
|
dlight_t *l;
|
|
|
|
r_dlightframecount = r_framecount;
|
|
for (i=0, l = r_newrefdef.dlights ; i<r_newrefdef.num_dlights ; i++, l++)
|
|
{
|
|
R_MarkLights ( l, 1<<i,
|
|
model->nodes + model->firstnode);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
=============================================================================
|
|
|
|
LIGHT SAMPLING
|
|
|
|
=============================================================================
|
|
*/
|
|
|
|
vec3_t pointcolor;
|
|
mplane_t *lightplane; // used as shadow plane
|
|
vec3_t lightspot;
|
|
|
|
int RecursiveLightPoint (mnode_t *node, vec3_t start, vec3_t end)
|
|
{
|
|
float front, back, frac;
|
|
int side;
|
|
mplane_t *plane;
|
|
vec3_t mid;
|
|
msurface_t *surf;
|
|
int s, t, ds, dt;
|
|
int i;
|
|
mtexinfo_t *tex;
|
|
byte *lightmap;
|
|
float *scales;
|
|
int maps;
|
|
float samp;
|
|
int r;
|
|
|
|
if (node->contents != -1)
|
|
return -1; // didn't hit anything
|
|
|
|
// calculate mid point
|
|
|
|
// FIXME: optimize for axial
|
|
plane = node->plane;
|
|
front = DotProduct (start, plane->normal) - plane->dist;
|
|
back = DotProduct (end, plane->normal) - plane->dist;
|
|
side = front < 0;
|
|
|
|
if ( (back < 0) == side)
|
|
return RecursiveLightPoint (node->children[side], start, end);
|
|
|
|
frac = front / (front-back);
|
|
mid[0] = start[0] + (end[0] - start[0])*frac;
|
|
mid[1] = start[1] + (end[1] - start[1])*frac;
|
|
mid[2] = start[2] + (end[2] - start[2])*frac;
|
|
if (plane->type < 3) // axial planes
|
|
mid[plane->type] = plane->dist;
|
|
|
|
// go down front side
|
|
r = RecursiveLightPoint (node->children[side], start, mid);
|
|
if (r >= 0)
|
|
return r; // hit something
|
|
|
|
if ( (back < 0) == side )
|
|
return -1; // didn't hit anuthing
|
|
|
|
// check for impact on this node
|
|
VectorCopy (mid, lightspot);
|
|
lightplane = plane;
|
|
|
|
surf = r_worldmodel->surfaces + node->firstsurface;
|
|
for (i=0 ; i<node->numsurfaces ; i++, surf++)
|
|
{
|
|
if (surf->flags&(SURF_DRAWTURB|SURF_DRAWSKY))
|
|
continue; // no lightmaps
|
|
|
|
tex = surf->texinfo;
|
|
|
|
s = DotProduct (mid, tex->vecs[0]) + tex->vecs[0][3];
|
|
t = DotProduct (mid, tex->vecs[1]) + tex->vecs[1][3];
|
|
if (s < surf->texturemins[0] ||
|
|
t < surf->texturemins[1])
|
|
continue;
|
|
|
|
ds = s - surf->texturemins[0];
|
|
dt = t - surf->texturemins[1];
|
|
|
|
if ( ds > surf->extents[0] || dt > surf->extents[1] )
|
|
continue;
|
|
|
|
if (!surf->samples)
|
|
return 0;
|
|
|
|
ds >>= 4;
|
|
dt >>= 4;
|
|
|
|
lightmap = surf->samples;
|
|
VectorCopy (vec3_origin, pointcolor);
|
|
if (lightmap)
|
|
{
|
|
lightmap += dt * ((surf->extents[0]>>4)+1) + ds;
|
|
|
|
for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
|
|
maps++)
|
|
{
|
|
samp = *lightmap * /* 0.5 * */ (1.0/255); // adjust for gl scale
|
|
scales = r_newrefdef.lightstyles[surf->styles[maps]].rgb;
|
|
VectorMA (pointcolor, samp, scales, pointcolor);
|
|
lightmap += ((surf->extents[0]>>4)+1) *
|
|
((surf->extents[1]>>4)+1);
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
// go down back side
|
|
return RecursiveLightPoint (node->children[!side], mid, end);
|
|
}
|
|
|
|
/*
|
|
===============
|
|
R_LightPoint
|
|
===============
|
|
*/
|
|
void R_LightPoint (vec3_t p, vec3_t color)
|
|
{
|
|
vec3_t end;
|
|
float r;
|
|
int lnum;
|
|
dlight_t *dl;
|
|
float light;
|
|
vec3_t dist;
|
|
float add;
|
|
|
|
if (!r_worldmodel->lightdata)
|
|
{
|
|
color[0] = color[1] = color[2] = 1.0;
|
|
return;
|
|
}
|
|
|
|
end[0] = p[0];
|
|
end[1] = p[1];
|
|
end[2] = p[2] - 2048;
|
|
|
|
r = RecursiveLightPoint (r_worldmodel->nodes, p, end);
|
|
|
|
if (r == -1)
|
|
{
|
|
VectorCopy (vec3_origin, color);
|
|
}
|
|
else
|
|
{
|
|
VectorCopy (pointcolor, color);
|
|
}
|
|
|
|
//
|
|
// add dynamic lights
|
|
//
|
|
light = 0;
|
|
for (lnum=0 ; lnum<r_newrefdef.num_dlights ; lnum++)
|
|
{
|
|
dl = &r_newrefdef.dlights[lnum];
|
|
VectorSubtract (currententity->origin,
|
|
dl->origin,
|
|
dist);
|
|
add = dl->intensity - VectorLength(dist);
|
|
add *= (1.0/256);
|
|
if (add > 0)
|
|
{
|
|
VectorMA (color, add, dl->color, color);
|
|
}
|
|
}
|
|
}
|
|
|
|
//===================================================================
|
|
|
|
|
|
unsigned blocklights[1024]; // allow some very large lightmaps
|
|
|
|
/*
|
|
===============
|
|
R_AddDynamicLights
|
|
===============
|
|
*/
|
|
void R_AddDynamicLights (void)
|
|
{
|
|
msurface_t *surf;
|
|
int lnum;
|
|
int sd, td;
|
|
float dist, rad, minlight;
|
|
vec3_t impact, local;
|
|
int s, t;
|
|
int i;
|
|
int smax, tmax;
|
|
mtexinfo_t *tex;
|
|
dlight_t *dl;
|
|
int negativeLight; //PGM
|
|
|
|
surf = r_drawsurf.surf;
|
|
smax = (surf->extents[0]>>4)+1;
|
|
tmax = (surf->extents[1]>>4)+1;
|
|
tex = surf->texinfo;
|
|
|
|
for (lnum=0 ; lnum<r_newrefdef.num_dlights ; lnum++)
|
|
{
|
|
if ( !(surf->dlightbits & (1<<lnum) ) )
|
|
continue; // not lit by this light
|
|
|
|
dl = &r_newrefdef.dlights[lnum];
|
|
rad = dl->intensity;
|
|
|
|
//=====
|
|
//PGM
|
|
negativeLight = 0;
|
|
if(rad < 0)
|
|
{
|
|
negativeLight = 1;
|
|
rad = -rad;
|
|
}
|
|
//PGM
|
|
//=====
|
|
|
|
dist = DotProduct (dl->origin, surf->plane->normal) -
|
|
surf->plane->dist;
|
|
rad -= fabs(dist);
|
|
minlight = 32; // dl->minlight;
|
|
if (rad < minlight)
|
|
continue;
|
|
minlight = rad - minlight;
|
|
|
|
for (i=0 ; i<3 ; i++)
|
|
{
|
|
impact[i] = dl->origin[i] -
|
|
surf->plane->normal[i]*dist;
|
|
}
|
|
|
|
local[0] = DotProduct (impact, tex->vecs[0]) + tex->vecs[0][3];
|
|
local[1] = DotProduct (impact, tex->vecs[1]) + tex->vecs[1][3];
|
|
|
|
local[0] -= surf->texturemins[0];
|
|
local[1] -= surf->texturemins[1];
|
|
|
|
for (t = 0 ; t<tmax ; t++)
|
|
{
|
|
td = local[1] - t*16;
|
|
if (td < 0)
|
|
td = -td;
|
|
for (s=0 ; s<smax ; s++)
|
|
{
|
|
sd = local[0] - s*16;
|
|
if (sd < 0)
|
|
sd = -sd;
|
|
if (sd > td)
|
|
dist = sd + (td>>1);
|
|
else
|
|
dist = td + (sd>>1);
|
|
//====
|
|
//PGM
|
|
if(!negativeLight)
|
|
{
|
|
if (dist < minlight)
|
|
blocklights[t*smax + s] += (rad - dist)*256;
|
|
}
|
|
else
|
|
{
|
|
if (dist < minlight)
|
|
blocklights[t*smax + s] -= (rad - dist)*256;
|
|
if(blocklights[t*smax + s] < minlight)
|
|
blocklights[t*smax + s] = minlight;
|
|
}
|
|
//PGM
|
|
//====
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
===============
|
|
R_BuildLightMap
|
|
|
|
Combine and scale multiple lightmaps into the 8.8 format in blocklights
|
|
===============
|
|
*/
|
|
void R_BuildLightMap (void)
|
|
{
|
|
int smax, tmax;
|
|
int t;
|
|
int i, size;
|
|
byte *lightmap;
|
|
unsigned scale;
|
|
int maps;
|
|
msurface_t *surf;
|
|
|
|
surf = r_drawsurf.surf;
|
|
|
|
smax = (surf->extents[0]>>4)+1;
|
|
tmax = (surf->extents[1]>>4)+1;
|
|
size = smax*tmax;
|
|
|
|
if (r_fullbright->value || !r_worldmodel->lightdata)
|
|
{
|
|
for (i=0 ; i<size ; i++)
|
|
blocklights[i] = 0;
|
|
return;
|
|
}
|
|
|
|
// clear to no light
|
|
for (i=0 ; i<size ; i++)
|
|
blocklights[i] = 0;
|
|
|
|
|
|
// add all the lightmaps
|
|
lightmap = surf->samples;
|
|
if (lightmap)
|
|
for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
|
|
maps++)
|
|
{
|
|
scale = r_drawsurf.lightadj[maps]; // 8.8 fraction
|
|
for (i=0 ; i<size ; i++)
|
|
blocklights[i] += lightmap[i] * scale;
|
|
lightmap += size; // skip to next lightmap
|
|
}
|
|
|
|
// add all the dynamic lights
|
|
if (surf->dlightframe == r_framecount)
|
|
R_AddDynamicLights ();
|
|
|
|
// bound, invert, and shift
|
|
for (i=0 ; i<size ; i++)
|
|
{
|
|
t = (int)blocklights[i];
|
|
if (t < 0)
|
|
t = 0;
|
|
t = (255*256 - t) >> (8 - VID_CBITS);
|
|
|
|
if (t < (1 << 6))
|
|
t = (1 << 6);
|
|
|
|
blocklights[i] = t;
|
|
}
|
|
}
|
|
|