mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-06 13:11:20 +00:00
313 lines
6.9 KiB
C
313 lines
6.9 KiB
C
/*
|
|
sw32_rlight.c
|
|
|
|
(description)
|
|
|
|
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
|
|
|
|
$Id$
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#include "QF/render.h"
|
|
|
|
#include "r_local.h"
|
|
|
|
//int r_dlightframecount;
|
|
|
|
|
|
void
|
|
R_AnimateLight (void)
|
|
{
|
|
int i, j, k;
|
|
|
|
// light animations
|
|
// 'm' is normal light, 'a' is no light, 'z' is double bright
|
|
i = (int) (r_realtime * 10);
|
|
for (j = 0; j < MAX_LIGHTSTYLES; j++) {
|
|
if (!r_lightstyle[j].length) {
|
|
d_lightstylevalue[j] = 256;
|
|
continue;
|
|
}
|
|
k = i % r_lightstyle[j].length;
|
|
k = r_lightstyle[j].map[k] - 'a';
|
|
k = k * 22;
|
|
d_lightstylevalue[j] = k;
|
|
}
|
|
}
|
|
|
|
/*
|
|
DYNAMIC LIGHTS
|
|
*/
|
|
|
|
static void
|
|
mark_surfaces (msurface_t *surf, vec3_t lightorigin, dlight_t *light,
|
|
int bit)
|
|
{
|
|
float dist;
|
|
#if 1
|
|
float dist2, d;
|
|
float maxdist = light->radius * light->radius;
|
|
vec3_t impact;
|
|
#endif
|
|
|
|
dist = PlaneDiff(lightorigin, surf->plane);
|
|
if (surf->flags & SURF_PLANEBACK)
|
|
dist = -dist;
|
|
if ((dist < -0.25f && !(surf->flags & SURF_LIGHTBOTHSIDES))
|
|
|| dist > light->radius)
|
|
return;
|
|
#if 1
|
|
dist2 = dist * dist;
|
|
dist = -dist;
|
|
VectorMA (light->origin, dist, surf->plane->normal, impact);
|
|
|
|
d = DotProduct (impact, surf->texinfo->vecs[0])
|
|
+ surf->texinfo->vecs[0][3] - surf->texturemins[0];
|
|
if (d < 0) {
|
|
dist2 += d * d;
|
|
if (dist2 >= maxdist)
|
|
return;
|
|
} else {
|
|
d -= surf->extents[0] + 16;
|
|
if (d > 0) {
|
|
dist2 += d * d;
|
|
if (dist2 >= maxdist)
|
|
return;
|
|
}
|
|
}
|
|
d = DotProduct (impact, surf->texinfo->vecs[1])
|
|
+ surf->texinfo->vecs[1][3] - surf->texturemins[1];
|
|
if (d < 0) {
|
|
dist2 += d * d;
|
|
if (dist2 >= maxdist)
|
|
return;
|
|
} else {
|
|
d -= surf->extents[1] + 16;
|
|
if (d > 0) {
|
|
dist2 += d * d;
|
|
if (dist2 >= maxdist)
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
if (surf->dlightframe != r_framecount) {
|
|
surf->dlightbits = 0;
|
|
surf->dlightframe = r_framecount;
|
|
}
|
|
surf->dlightbits |= bit;
|
|
}
|
|
|
|
|
|
void
|
|
R_MarkLights (vec3_t lightorigin, dlight_t *light, int bit, model_t *model)
|
|
{
|
|
mleaf_t *pvsleaf = Mod_PointInLeaf (lightorigin, model);
|
|
|
|
if (!pvsleaf->compressed_vis) {
|
|
mnode_t *node = model->nodes + model->hulls[0].firstclipnode;
|
|
R_RecursiveMarkLights (lightorigin, light, bit, node);
|
|
} else {
|
|
float radius = light->radius;
|
|
vec3_t mins, maxs;
|
|
int leafnum = 0;
|
|
byte *in = pvsleaf->compressed_vis;
|
|
byte vis_bits;
|
|
|
|
mins[0] = lightorigin[0] - radius;
|
|
mins[1] = lightorigin[1] - radius;
|
|
mins[2] = lightorigin[2] - radius;
|
|
maxs[0] = lightorigin[0] + radius;
|
|
maxs[1] = lightorigin[1] + radius;
|
|
maxs[2] = lightorigin[2] + radius;
|
|
while (leafnum < model->numleafs) {
|
|
int i;
|
|
if (!(vis_bits = *in++)) {
|
|
leafnum += (*in++) * 8;
|
|
continue;
|
|
}
|
|
for (i = 0; i < 8 && leafnum < model->numleafs; i++, leafnum++) {
|
|
int m;
|
|
mleaf_t *leaf = &model->leafs[leafnum + 1];
|
|
if (!(vis_bits & (1 << i)))
|
|
continue;
|
|
if (leaf->visframe != r_visframecount)
|
|
continue;
|
|
if (leaf->mins[0] > maxs[0] || leaf->maxs[0] < mins[0]
|
|
|| leaf->mins[1] > maxs[1] || leaf->maxs[1] < mins[1]
|
|
|| leaf->mins[2] > maxs[2] || leaf->maxs[2] < mins[2])
|
|
continue;
|
|
if (leaf->dlightframe != r_framecount) {
|
|
leaf->dlightbits = 0;
|
|
leaf->dlightframe = r_framecount;
|
|
}
|
|
leaf->dlightbits |= bit;
|
|
for (m = 0; m < leaf->nummarksurfaces; m++) {
|
|
msurface_t *surf = leaf->firstmarksurface[m];
|
|
if (surf->visframe != r_visframecount)
|
|
continue;
|
|
mark_surfaces (surf, lightorigin, light, bit);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
R_PushDlights (vec3_t entorigin)
|
|
{
|
|
int i;
|
|
dlight_t *l;
|
|
vec3_t lightorigin;
|
|
|
|
l = r_dlights;
|
|
|
|
for (i = 0; i < MAX_DLIGHTS; i++, l++) {
|
|
if (l->die < r_realtime || !l->radius)
|
|
continue;
|
|
VectorSubtract (l->origin, entorigin, lightorigin);
|
|
R_MarkLights (lightorigin, l, 1 << i, r_worldentity.model);
|
|
}
|
|
}
|
|
|
|
/*
|
|
LIGHT SAMPLING
|
|
*/
|
|
|
|
int
|
|
RecursiveLightPoint (mnode_t *node, vec3_t start, vec3_t end)
|
|
{
|
|
int r;
|
|
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;
|
|
unsigned int scale;
|
|
int maps;
|
|
|
|
if (node->contents < 0)
|
|
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;
|
|
|
|
// 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 anything
|
|
|
|
// check for impact on this node
|
|
|
|
surf = r_worldentity.model->surfaces + node->firstsurface;
|
|
for (i = 0; i < node->numsurfaces; i++, surf++) {
|
|
if (surf->flags & SURF_DRAWTILED)
|
|
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;
|
|
r = 0;
|
|
if (lightmap) {
|
|
|
|
lightmap += dt * ((surf->extents[0] >> 4) + 1) + ds;
|
|
|
|
for (maps = 0; maps < MAXLIGHTMAPS && surf->styles[maps] != 255;
|
|
maps++) {
|
|
scale = d_lightstylevalue[surf->styles[maps]];
|
|
r += *lightmap * scale;
|
|
lightmap += ((surf->extents[0] >> 4) + 1) *
|
|
((surf->extents[1] >> 4) + 1);
|
|
}
|
|
|
|
r >>= 8;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
// go down back side
|
|
return RecursiveLightPoint (node->children[!side], mid, end);
|
|
}
|
|
|
|
int
|
|
R_LightPoint (vec3_t p)
|
|
{
|
|
vec3_t end;
|
|
int r;
|
|
|
|
if (!r_worldentity.model->lightdata)
|
|
return 255;
|
|
|
|
end[0] = p[0];
|
|
end[1] = p[1];
|
|
end[2] = p[2] - 2048;
|
|
|
|
r = RecursiveLightPoint (r_worldentity.model->nodes, p, end);
|
|
|
|
if (r == -1)
|
|
r = 0;
|
|
|
|
if (r < r_refdef.ambientlight)
|
|
r = r_refdef.ambientlight;
|
|
|
|
return r;
|
|
}
|