forked from valve/halflife-sdk
156 lines
3 KiB
C
156 lines
3 KiB
C
/***
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*
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* Copyright (c) 1996-2001, Valve LLC. All rights reserved.
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*
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* This product contains software technology licensed from Id
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* Software, Inc. ("Id Technology"). Id Technology (c) 1996 Id Software, Inc.
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* All Rights Reserved.
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*
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****/
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#include "vis.h"
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/*
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Some textures (sky, water, slime, lava) are considered ambien sound emiters.
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Find an aproximate distance to the nearest emiter of each class for each leaf.
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*/
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/*
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====================
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SurfaceBBox
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====================
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*/
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void SurfaceBBox (dface_t *s, vec3_t mins, vec3_t maxs)
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{
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int i, j;
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int e;
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int vi;
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float *v;
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mins[0] = mins[1] = mins[2] = 999999;
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maxs[0] = maxs[1] = maxs[2] = -99999;
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for (i=0 ; i<s->numedges ; i++)
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{
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e = dsurfedges[s->firstedge+i];
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if (e >= 0)
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vi = dedges[e].v[0];
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else
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vi = dedges[-e].v[1];
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v = dvertexes[vi].point;
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for (j=0 ; j<3 ; j++)
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{
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if (v[j] < mins[j])
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mins[j] = v[j];
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if (v[j] > maxs[j])
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maxs[j] = v[j];
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}
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}
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}
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/*
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====================
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CalcAmbientSounds
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====================
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*/
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void CalcAmbientSounds (void)
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{
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int i, j, k, l;
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dleaf_t *leaf, *hit;
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byte *vis;
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dface_t *surf;
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vec3_t mins, maxs;
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float d, maxd;
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int ambient_type;
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texinfo_t *info;
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miptex_t *miptex;
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int ofs;
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float dists[NUM_AMBIENTS];
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float vol;
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for (i=0 ; i< portalleafs ; i++)
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{
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leaf = &dleafs[i+1];
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//
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// clear ambients
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//
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for (j=0 ; j<NUM_AMBIENTS ; j++)
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dists[j] = 1020;
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vis = &uncompressed[i*bitbytes];
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for (j=0 ; j< portalleafs ; j++)
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{
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if ( !(vis[j>>3] & (1<<(j&7))) )
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continue;
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//
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// check this leaf for sound textures
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//
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hit = &dleafs[j+1];
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for (k=0 ; k< hit->nummarksurfaces ; k++)
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{
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surf = &dfaces[dmarksurfaces[hit->firstmarksurface + k]];
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info = &texinfo[surf->texinfo];
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ofs = ((dmiptexlump_t *)dtexdata)->dataofs[info->miptex];
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miptex = (miptex_t *)(&dtexdata[ofs]);
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if ( !Q_strncasecmp (miptex->name, "!water", 6) )
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ambient_type = AMBIENT_WATER;
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else if ( !Q_strncasecmp (miptex->name, "sky", 3) )
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ambient_type = AMBIENT_SKY;
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else if ( !Q_strncasecmp (miptex->name, "!slime", 6) )
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ambient_type = AMBIENT_WATER; // AMBIENT_SLIME;
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else if ( !Q_strncasecmp (miptex->name, "!lava", 6) )
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ambient_type = AMBIENT_LAVA;
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else if ( !Q_strncasecmp (miptex->name, "!04water", 8) )
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ambient_type = AMBIENT_WATER;
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else
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continue;
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// find distance from source leaf to polygon
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SurfaceBBox (surf, mins, maxs);
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maxd = 0;
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for (l=0 ; l<3 ; l++)
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{
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if (mins[l] > leaf->maxs[l])
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d = mins[l] - leaf->maxs[l];
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else if (maxs[l] < leaf->mins[l])
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d = leaf->mins[l] - mins[l];
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else
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d = 0;
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if (d > maxd)
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maxd = d;
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}
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maxd = 0.25;
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if (maxd < dists[ambient_type])
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dists[ambient_type] = maxd;
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}
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}
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for (j=0 ; j<NUM_AMBIENTS ; j++)
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{
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if (dists[j] < 100)
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vol = 1.0;
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else
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{
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vol = 1.0 - dists[2]*0.002;
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if (vol < 0)
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vol = 0;
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}
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leaf->ambient_level[j] = vol*255;
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}
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}
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}
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