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wl_atmos.cpp
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wl_atmos.cpp
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#include "version.h"
#if defined(USE_STARSKY) || defined(USE_RAIN) || defined(USE_SNOW)
#include "wl_def.h"
#include "wl_atmos.h"
#if defined(USE_RAIN) || defined(USE_SNOW)
uint32_t rainpos = 0;
#endif
typedef struct {
int32_t x, y, z;
} point3d_t;
#define MAXPOINTS 500
point3d_t points[MAXPOINTS];
byte moon[100]={
0, 0, 27, 18, 15, 16, 19, 29, 0, 0,
0, 22, 16, 15, 15, 16, 16, 18, 24, 0,
27, 17, 15, 17, 16, 16, 17, 17, 18, 29,
18, 15, 15, 15, 16, 16, 17, 17, 18, 20,
16, 15, 15, 16, 16, 17, 17, 18, 19, 21,
16, 15, 17, 20, 18, 17, 18, 18, 20, 22,
19, 16, 18, 19, 17, 17, 18, 19, 22, 24,
28, 19, 17, 17, 17, 18, 19, 21, 25, 31,
0, 23, 18, 19, 18, 20, 22, 24, 28, 0,
0, 0, 28, 21, 20, 22, 28, 30, 0, 0 };
/*
======================
=
= Init3DPoints
=
======================
*/
void Init3DPoints()
{
for(int i = 0; i < MAXPOINTS; i++)
{
point3d_t *pt = &points[i];
pt->x = 16384 - (rand() & 32767);
pt->z = 16384 - (rand() & 32767);
float len = sqrt((float)pt->x * pt->x + (float)pt->z * pt->z);
int j=50;
do
{
pt->y = 1024 + (rand() & 8191);
j--;
}
while(j > 0 && (float)pt->y * 256.F / len >= halfviewheight);
}
}
#endif
#ifdef USE_STARSKY
/*
======================
=
= DrawStarSky
=
======================
*/
void DrawStarSky(byte *vbuf, uint32_t vbufPitch)
{
if (!switches.textures && MAPSPOT(player->tilex,player->tiley,2) != 0)
return;
byte *ptr = vbuf;
int i;
for(i = 0; i < halfviewheight; i++, ptr += vbufPitch)
memset(ptr, 0, viewwidth);
for(i = 0; i < MAXPOINTS; i++)
{
point3d_t *pt = &points[i];
int32_t x = pt->x * viewcos + pt->z * viewsin;
int32_t y = pt->y << 16;
int32_t z = (pt->z * viewcos - pt->x * viewsin) >> 8;
if(z <= 0) continue;
int shade = z >> 18;
if(shade > 15) continue;
int32_t xx = x / z * scaleFactor + halfviewwidth;
int32_t yy = halfviewheight - y / z;
if(xx >= 0 && xx < viewwidth && yy >= 0 && yy < halfviewheight)
vbuf[yy * vbufPitch + xx] = shade + 15;
}
int32_t x = 16384 * viewcos + 16384 * viewsin;
int32_t z = (16384 * viewcos - 16384 * viewsin) >> 8;
if(z <= 0) return;
int32_t xx = x / z * scaleFactor + halfviewwidth;
int32_t yy = halfviewheight - ((halfviewheight - (halfviewheight >> 3)) << 22) / z;
if(xx > -10 && xx < viewwidth)
{
int stopx = 10 * scaleFactor, starty = 0, stopy = 10 * scaleFactor;
i = 0;
if(xx < 0) {i = -xx; xx = 0;}
if(xx > viewwidth - 11 * (signed)scaleFactor) stopx = viewwidth - xx;
if(yy < 0) starty = -yy;
if(yy > viewheight - 11 * (signed)scaleFactor) stopy = viewheight - yy;
for(; i < stopx; i++)
for(int j = starty; j < stopy; j++)
vbuf[(yy + j) * vbufPitch + xx + i] = moon[j/scaleFactor * 10 + i/scaleFactor];
}
}
#endif
#ifdef USE_RAIN
/*
======================
=
= DrawRain
=
======================
*/
void DrawRain(byte *vbuf, uint32_t vbufPitch)
{
#if defined(USE_FLOORCEILINGTEX) && defined(FIXRAINSNOWLEAKS)
fixed dist; // distance to row projection
fixed gu, gv, floorx, floory; // global texture coordinates
#endif
fixed px = (player->y + FixedMul(0x7900, viewsin)) >> 6;
fixed pz = (player->x - FixedMul(0x7900, viewcos)) >> 6;
int32_t ax, az, x, y, z, xx, yy, height, actheight;
int shade;
rainpos -= tics * 900;
for(int i = 0; i < MAXPOINTS; i++)
{
#ifdef VARIABLEWEATHER
if (i > gamestate.weatherpoints) break;
#endif
point3d_t *pt = &points[i];
ax = pt->x + px;
ax = 0x1fff - (ax & 0x3fff);
az = pt->z + pz;
az = 0x1fff - (az & 0x3fff);
x = ax * viewcos + az * viewsin;
y = -(57278464) + +((((pt->y << 6) + rainpos) & 0x0ffff) << 11);
z = (az * viewcos - ax * viewsin) << 8 ;
if(z <= 0) continue;
shade = z >> 17;
if(shade > 13) continue;
xx = x / z + halfviewwidth;
if(xx < 0 || xx >= viewwidth) continue;
actheight = y / z;
yy = halfviewheight - actheight;
height = (458227712) / z;
if(actheight < 0) actheight = -actheight;
if(actheight < (wallheight[xx] >> 3) && height < wallheight[xx]) continue;
if(xx >= 0 && xx < viewwidth && yy > 0 && yy < viewheight)
{
#if defined(USE_FLOORCEILINGTEX) && defined(FIXRAINSNOWLEAKS)
// Find the rain's tile coordinate
// NOTE: This sometimes goes over the map edges.
dist = ((heightnumerator / (( (( heightnumerator << 10) / z)>> 3) + 1)) << 5);
gu = viewx + FixedMul(dist, viewcos);
gv = -viewy + FixedMul(dist, viewsin);
floorx = ( gu >> TILESHIFT ) & (MAPSIZE-1);
floory = (-(gv >> TILESHIFT) - 1) & (MAPSIZE-1);
// Is there a ceiling tile?
if(MAPSPOT(floorx, floory, 2) >> 8) continue;
#endif
vbuf[yy * vbufPitch + xx] = shade+15;
vbuf[(yy - 1) * vbufPitch + xx] = shade+16;
if(yy > 2)
vbuf[(yy - 2) * vbufPitch + xx] = shade+17;
}
}
}
#endif
#ifdef USE_SNOW
/*
======================
=
= DrawSnow
=
======================
*/
void DrawSnow(byte *vbuf, uint32_t vbufPitch)
{
#if defined(USE_FLOORCEILINGTEX) && defined(FIXRAINSNOWLEAKS)
fixed dist; // distance to row projection
// fixed tex_step; // global step per one screen pixel
fixed gu, gv, floorx, floory; // global texture coordinates
#endif
fixed px = (player->y + FixedMul(0x7900, viewsin)) >> 6;
fixed pz = (player->x - FixedMul(0x7900, viewcos)) >> 6;
int32_t ax, az, x, y, z, xx, yy, height, actheight;
int shade;
rainpos -= tics * 256;
for(int i = 0; i < MAXPOINTS; i++)
{
#ifdef VARIABLEWEATHER
if (i > gamestate.weatherpoints) break;
#endif
point3d_t *pt = &points[i];
ax = pt->x + px;
ax = 0x1fff - (ax & 0x3fff);
az = pt->z + pz;
az = 0x1fff - (az & 0x3fff);
x = ax * viewcos + az * viewsin;
y = -(57278464) + ((((pt->y << 6) + rainpos) & 0x0ffff) << 11);
z = (az * viewcos - ax * viewsin) >> 8;
if(z <= 0) continue;
shade = z >> 17;
if(shade > 13) continue;
xx = x / z * scaleFactor + halfviewwidth;
if(xx < 0 || xx >= viewwidth) continue;
actheight = y/z;
yy = halfviewheight - actheight;
height = (458227712) / z;
if(actheight < 0) actheight = -actheight;
if(actheight < (wallheight[xx] >> 3) && height < wallheight[xx]) continue;
if(xx > 0 && xx < viewwidth && yy > 0 && yy < viewheight)
{
#if defined(USE_FLOORCEILINGTEX) && defined(FIXRAINSNOWLEAKS)
// Find the snow's tile coordinate
// NOTE: This sometimes goes over the map edges.
dist = ((heightnumerator / ((( heightnumerator << 10) / z) + 1)) << 5);
gu = viewx + FixedMul(dist, viewcos);
gv = -viewy + FixedMul(dist, viewsin);
floorx = ( gu >> TILESHIFT ) & (MAPSIZE - 1);
floory = (-(gv >> TILESHIFT) - 1) & (MAPSIZE - 1);
// Is there a ceiling tile?
if(MAPSPOT(floorx, floory, 2) >> 8) continue;
#endif
if(shade < 10)
{
vbuf[yy * vbufPitch + xx] = shade+17;
vbuf[yy * vbufPitch + xx - 1] = shade+16;
vbuf[(yy - 1) * vbufPitch + xx] = shade+16;
vbuf[(yy - 1) * vbufPitch + xx - 1] = shade+15;
}
else
vbuf[yy * vbufPitch + xx] = shade+15;
}
}
}
#endif
#ifdef VARIABLEWEATHER
/*
======================
=
= InitializeWeatherState
=
======================
*/
void InitializeWeatherState() {
#ifdef CRAND
int chance = Random(100);
#else
int chance = US_RndT();
#endif
gamestate.weatherchecktics = WEATHERCHANGEDELAY * 70;
gamestate.weatherdelaytics = WEATHERDELAY * 70;
gamestate.weatherchange = 0;
#ifdef CRAND
if (chance < 40) { // 40% no weather
gamestate.weatherpoints = 0; // no weather
} else if (chance < 60) { // 20% in-between
gamestate.weatherpoints = Random(100) + 5;
} else { // 40% weather
gamestate.weatherpoints = MAXPOINTS;
}
#else
if (chance < 100) { // 40% no weather
gamestate.weatherpoints = 0; // no weather
} else if (chance < 125) { // 20% in-between
gamestate.weatherpoints = US_RndT() + 5;
} else { // 40% weather
gamestate.weatherpoints = MAXPOINTS;
}
#endif
}
/*
======================
=
= PollWeatherChange
=
======================
*/
void PollWeatherChange() {
#ifdef CRAND
if (Random(100) < 20) {
#else
if (US_RndT() < 50) {
#endif// 20% chance for weather to change
if (gamestate.weatherpoints == 0) {
gamestate.weatherchange = 1;
} else if (gamestate.weatherpoints == MAXPOINTS) {
gamestate.weatherchange = -1;
} else {
#ifdef CRAND
gamestate.weatherchange = (Random(2) == 0 ? -1 : 1);
#else
gamestate.weatherchange = (US_RndT() % 2 == 0 ? -1 : 1);
#endif
}
}
gamestate.weatherchecktics = WEATHERCHANGEDELAY * 70;
}
#endif