ref: 516fc276f112baf0bd4508596598aed49929bde9
dir: /src/rt_floor.c/
/*
Copyright (C) 1994-1995 Apogee Software, Ltd.
Copyright (C) 2002-2015 icculus.org, GNU/Linux port
Copyright (C) 2017-2018 Steven LeVesque
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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
// RT_FLOOR.C
#include "rt_def.h"
#include "watcom.h"
#include "rt_floor.h"
#include "rt_fc_a.h"
#include "_rt_floo.h"
#include "rt_draw.h"
#include "rt_util.h"
#include "engine.h"
#include "rt_main.h"
#include "w_wad.h"
#include "z_zone.h"
#include "rt_view.h"
#include "rt_ted.h"
#include "rt_cfg.h"
#include "rt_actor.h"
#include <string.h>
#include "isr.h"
#include "modexlib.h"
#include "rt_playr.h"
#include "rt_sound.h"
#include "rt_rand.h"
/*
=============================================================================
Global Variables GLOBAL VARIABLES
=============================================================================
*/
int sky;
int mr_rowofs;
int mr_count;
int mr_xstep;
int mr_ystep;
int mr_xfrac;
int mr_yfrac;
byte * mr_dest;
byte * mr_src;
/*
==================
=
= Local Variables
=
==================
*/
static byte *floorptr;
static byte *ceilingptr;
//static int xstarts[MAXVIEWHEIGHT];
static int xstarts[MAXSCREENHEIGHT];//set to max hight res
static byte * skysegs[MAXSKYSEGS];
static byte * skydata[MAXSKYDATA];
static int horizonheight;
static int centerskypost;
static int oldsky=-1;
//bna fixit skyerror by 800x600 clouds not big enough
void DrawSky( void )
{
byte * src;
int dest;
// int plane;
int height;
// int height2;
int ang;
int angle;
int ofs;
angle=viewangle;
if ((fog==0) && (lightning==true))
shadingtable=colormap+((basemaxshade-6-lightninglevel)<<8);
else
shadingtable=colormap+(1<<12);
ofs=(((maxheight)-(player->z))>>3)+(centery*200/iGLOBAL_SCREENHEIGHT-((viewheight*200/iGLOBAL_SCREENHEIGHT)>>1));
if (ofs>centerskypost)
{
ofs=centerskypost;
}
else if (((centerskypost-ofs)+viewheight*200/iGLOBAL_SCREENHEIGHT)>1799)
{
ofs=-(1799-(centerskypost+viewheight*200/iGLOBAL_SCREENHEIGHT));
}
//ofs=centerskypost;
{
{
for (dest=0; dest<viewwidth; dest++)
{
if ((height=posts[dest].ceilingclip)<=0)
continue;
ang=(angle+pixelangle[dest])&(FINEANGLES-1);
src=skysegs[ang]-ofs;
DrawSkyPost((byte *)bufferofs + dest,src,height);
}
}
}
}
/*
===================
=
= DrawFullSky
=
===================
*/
void DrawFullSky( void )
{
byte * src;
int dest;
int ang;
int angle;
int ofs;
angle=viewangle;
if ((fog==0) && (lightning==true))
shadingtable=colormap+((basemaxshade-5-lightninglevel)<<8);
else
shadingtable=colormap+(1<<12);
ofs=(((maxheight)-(player->z))>>3)+(centery-(viewheight>>1));
if (ofs>centerskypost)
{
ofs=centerskypost;
}
else if (((centerskypost-ofs)+viewheight)>599)
{
ofs=-(599-(centerskypost+viewheight));
}
bufferofs+=screenofs;
{
for (dest=0; dest<viewwidth; dest++)
{
ang=(angle+pixelangle[dest])&(FINEANGLES-1);
src=skysegs[ang]-ofs;
DrawSkyPost((byte *)bufferofs + dest,src,viewheight);
}
}
bufferofs-=screenofs;
}
/*
===================
=
= MakeSkyTile
=
===================
*/
void MakeSkyTile (byte * tile)
{
int i,j;
int srcstep;
int src;
srcstep=200<<10;
for (i=0; i<64; i++)
{
src=0;
for (j=0; j<64; j++)
{
*(tile + (i<<6) + j)=*(skysegs[(i<<2)]+(src>>16));
src+=srcstep;
}
}
}
/*
===================
=
= MakeSkyData
=
===================
*/
void MakeSkyData ( void )
{
byte * temp;
byte * ptr;
int c;
temp=SafeMalloc(256*1024);
ptr=temp;
for (c=0; c<256; c++)
{
memcpy(ptr,skydata[1]+(c*200),200);
ptr+=200;
memcpy(ptr,skydata[0]+(c*200),200);
ptr+=200;
//memcpy(ptr,skydata[1]+(c*200),200);
//ptr+=200;
//memcpy(ptr,skydata[0]+(c*200),200);
//ptr+=200;
}
skydata[0]=temp;
}
/*
===================
=
= GetFloorCeilingLump
=
===================
*/
int GetFloorCeilingLump ( int num )
{
int lump;
switch (num)
{
case 1:
lump=W_GetNumForName("FLRCL1\0");
break;
case 2:
lump=W_GetNumForName("FLRCL2\0");
break;
case 3:
lump=W_GetNumForName("FLRCL3\0");
break;
case 4:
lump=W_GetNumForName("FLRCL4\0");
break;
case 5:
lump=W_GetNumForName("FLRCL5\0");
break;
case 6:
lump=W_GetNumForName("FLRCL6\0");
break;
case 7:
lump=W_GetNumForName("FLRCL7\0");
break;
case 8:
lump=W_GetNumForName("FLRCL8\0");
break;
case 9:
lump=W_GetNumForName("FLRCL9\0");
break;
case 10:
lump=W_GetNumForName("FLRCL10\0");
break;
case 11:
lump=W_GetNumForName("FLRCL11\0");
break;
case 12:
lump=W_GetNumForName("FLRCL12\0");
break;
case 13:
lump=W_GetNumForName("FLRCL13\0");
break;
case 14:
lump=W_GetNumForName("FLRCL14\0");
break;
case 15:
lump=W_GetNumForName("FLRCL15\0");
break;
case 16:
lump=W_GetNumForName("FLRCL16\0");
break;
default:
Error("Illegal Floor/Ceiling Tile = %d\n",num);
break;
}
return lump;
}
/*
===================
=
= SkyExists
=
===================
*/
boolean SkyExists (void)
{
if (MAPSPOT(1,0,0) >= 234)
{
return true;
}
else
{
return false;
}
}
/*
===================
=
= SetPlaneViewSize
=
===================
*/
void SetPlaneViewSize (void)
{
int x;
int i;
int s;
int floornum;
int ceilingnum;
int skytop;
int skybottom;
sky=0;
if (oldsky>0)
{
SafeFree(skydata[0]);
oldsky=-1;
}
lightning=false;
if (MAPSPOT(1,0,0) >= 234)
{
word crud;
sky = (MAPSPOT(1,0,0) - 233);
if ((sky<1) || (sky>6))
Error("Illegal Sky Tile = %d\n",sky);
ceilingnum=1;
crud=(word)MAPSPOT(1,0,1);
if ((crud>=90) && (crud<=97))
horizonheight=crud-89;
else if ((crud>=450) && (crud<=457))
horizonheight=crud-450+9;
else
Error("You must specify a valid horizon height sprite icon over the sky at (2,0) on map %d\n",gamestate.mapon);
// Check for lightnign icon
crud=(word)MAPSPOT(4,0,1);
if (crud==377)
lightning=true;
}
else
ceilingnum = MAPSPOT(1,0,0)-197;
floornum = MAPSPOT(0,0,0)-(179);
floornum = GetFloorCeilingLump ( floornum );
//ceilingnum = GetFloorCeilingLump ( ceilingnum );
floorptr = W_CacheLumpNum(floornum,PU_LEVELSTRUCT, Cvt_patch_t, 1);
floorptr +=8;
if (sky==0) // Don't cache in if not used
{
ceilingnum = GetFloorCeilingLump ( ceilingnum );
ceilingptr = W_CacheLumpNum(ceilingnum,PU_LEVELSTRUCT, Cvt_patch_t, 1);
ceilingptr +=8;
} else {
ceilingptr = NULL;
}
s = W_GetNumForName("SKYSTART");
switch (sky)
{
case 1:
skytop=s+1;
skybottom=s+2;
break;
case 2:
skytop=s+3;
skybottom=s+4;
break;
case 3:
skytop=s+5;
skybottom=s+6;
break;
case 4:
skytop=s+7;
skybottom=s+8;
break;
case 5:
skytop=s+9;
skybottom=s+10;
break;
case 6:
skytop=s+11;
skybottom=s+12;
break;
}
if (sky!=0)
{
skydata[0]=W_CacheLumpNum(skytop,PU_STATIC, CvtNull, 1);
skydata[1]=W_CacheLumpNum(skybottom,PU_STATIC, CvtNull, 1);
centerskypost=MINSKYHEIGHT-(horizonheight*6);
oldsky=sky;
MakeSkyData();
W_CacheLumpNum(skytop,PU_CACHE, CvtNull, 1);
W_CacheLumpNum(skybottom,PU_CACHE, CvtNull, 1);
x=511;
for (i=0; i<MAXSKYSEGS; i++)
{
skysegs[i]=skydata[0]+((x>>1)*400)+centerskypost;
x--;
if (x==-1)
{
x=511;
}
} /* endfor */
}
}
/*
==========================
=
= SetFCLightLevel
=
==========================
*/
void SetFCLightLevel (int height)
{
int i;
if (MISCVARS->GASON==1)
{
shadingtable=greenmap+(MISCVARS->gasindex<<8);
return;
}
if (fulllight)
{
shadingtable=colormap+(1<<12);
return;
}
if (fog)
{
i=((height*200/iGLOBAL_SCREENHEIGHT)>>normalshade)+minshade;
if (i>maxshade) i=maxshade;
shadingtable=colormap+(i<<8);
}
else
{
i=maxshade-(height>>normalshade);
if (i<minshade) i=minshade;
shadingtable=colormap+(i<<8);
}
}
void DrawHLine (int xleft, int xright, int yp)
{
byte * buf;
byte * dest;
int startxfrac;
int startyfrac;
int height;
// int length;
if (yp==centery)
return;
if (yp>centery)
{
int hd;
buf=floorptr;
hd=yp-centery;
height=(hd<<13)/(maxheight-pheight+32);
}
else
{
int hd;
/* ROTT bug? It'd draw when there was no ceiling. - SBF */
if (ceilingptr == NULL) return;
buf=ceilingptr;
hd=centery-yp;
height=(hd<<13)/pheight;
}
SetFCLightLevel(height>>(8-HEIGHTFRACTION-1));
mr_xstep = ((viewsin<<8)/(height));
mr_ystep = ((viewcos<<8)/(height));
startxfrac = ((viewx>>1) + FixedMulShift(mr_ystep,scale,2))-
FixedMulShift(mr_xstep,(centerx-xleft),2);
startyfrac = ((viewy>>1) - FixedMulShift(mr_xstep,scale,2))-
FixedMulShift(mr_ystep,(centerx-xleft),2);
dest=(byte *)bufferofs+ylookup[yp];
/* TODO: horizontal isn't as easy as vertical in packed */
{
{
mr_dest=dest+xleft;
mr_xfrac = startxfrac;
mr_yfrac = startyfrac;
// back off the pixel increment (orig. is 4x)
mr_xstep >>= 2;
mr_ystep >>= 2;
mr_count = xright-xleft+1;
if (mr_count)
DrawRow(mr_count,mr_dest,buf);
}
}
}
void DrawPlanes( void )
{
int x,y;
int twall;
int bwall;
if (sky)
DrawSky();
else
{
y=0;
for (x=0; x<viewwidth; x++)
{
twall=posts[x].ceilingclip;
while (y<twall)
{
xstarts[y]=x;
y++;
}
while (y>twall)
{
y--;
DrawHLine(xstarts[y],x-1,y);
}
}
while (y>0)
{
y--;
DrawHLine(xstarts[y],viewwidth-1,y);
}
}
y=viewheight-1;
for (x=0; x<viewwidth; x++)
{
bwall=posts[x].floorclip;
while (y>bwall)
{
xstarts[y]=x;
y--;
}
while (y<bwall)
{
y++;
DrawHLine(xstarts[y],x-1,y);
}
}
while (y<viewheight-1)
{
y++;
DrawHLine(xstarts[y],viewwidth-1,y);
}
}
void DrawRow(int count, byte * dest, byte * src)
{
unsigned frac, fracstep;
int coord;
frac = (mr_yfrac<<16) + (mr_xfrac&0xffff);
fracstep = (mr_ystep<<16) + (mr_xstep&0xffff);
while (count--) {
/* extract the x/y coordinates */
coord = ((frac >> (32-7)) | ((frac >> (32-23)) << 7)) & 16383;
*dest++ = shadingtable[src[coord]];
frac += fracstep;
}
}