ref: 0774dce204c2c01622c59819e2a29590a1b50e46
dir: /src/hexen/r_plane.c/
//**************************************************************************
//**
//** r_plane.c : Heretic 2 : Raven Software, Corp.
//**
//** $RCSfile: r_plane.c,v $
//** $Revision: 1.5 $
//** $Date: 95/07/13 15:17:12 $
//** $Author: cjr $
//**
//**************************************************************************
// HEADER FILES ------------------------------------------------------------
#include "h2def.h"
#include "r_local.h"
// MACROS ------------------------------------------------------------------
// TYPES -------------------------------------------------------------------
// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------
// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
// EXTERNAL DATA DECLARATIONS ----------------------------------------------
extern fixed_t Sky1ScrollDelta;
extern fixed_t Sky2ScrollDelta;
// PUBLIC DATA DEFINITIONS -------------------------------------------------
int Sky1Texture;
int Sky2Texture;
fixed_t Sky1ColumnOffset;
fixed_t Sky2ColumnOffset;
int skyflatnum;
int skytexturemid;
fixed_t skyiscale;
boolean DoubleSky;
planefunction_t floorfunc, ceilingfunc;
// Opening
visplane_t visplanes[MAXVISPLANES], *lastvisplane;
visplane_t *floorplane, *ceilingplane;
short openings[MAXOPENINGS], *lastopening;
// Clip values are the solid pixel bounding the range.
// floorclip start out SCREENHEIGHT
// ceilingclip starts out -1
short floorclip[SCREENWIDTH];
short ceilingclip[SCREENWIDTH];
// spanstart holds the start of a plane span, initialized to 0
int spanstart[SCREENHEIGHT];
int spanstop[SCREENHEIGHT];
// Texture mapping
lighttable_t **planezlight;
fixed_t planeheight;
fixed_t yslope[SCREENHEIGHT];
fixed_t distscale[SCREENWIDTH];
fixed_t basexscale, baseyscale;
fixed_t cachedheight[SCREENHEIGHT];
fixed_t cacheddistance[SCREENHEIGHT];
fixed_t cachedxstep[SCREENHEIGHT];
fixed_t cachedystep[SCREENHEIGHT];
// PRIVATE DATA DEFINITIONS ------------------------------------------------
// CODE --------------------------------------------------------------------
//==========================================================================
//
// R_InitSky
//
// Called at level load.
//
//==========================================================================
void R_InitSky(int map)
{
Sky1Texture = P_GetMapSky1Texture(map);
Sky2Texture = P_GetMapSky2Texture(map);
Sky1ScrollDelta = P_GetMapSky1ScrollDelta(map);
Sky2ScrollDelta = P_GetMapSky2ScrollDelta(map);
Sky1ColumnOffset = 0;
Sky2ColumnOffset = 0;
DoubleSky = P_GetMapDoubleSky(map);
}
//==========================================================================
//
// R_InitSkyMap
//
// Called whenever the view size changes.
//
//==========================================================================
void R_InitSkyMap(void)
{
skyflatnum = R_FlatNumForName("F_SKY");
skytexturemid = 200*FRACUNIT;
skyiscale = FRACUNIT;
}
//==========================================================================
//
// R_InitPlanes
//
// Called at game startup.
//
//==========================================================================
void R_InitPlanes(void)
{
}
//==========================================================================
//
// R_MapPlane
//
// Globals used: planeheight, ds_source, basexscale, baseyscale,
// viewx, viewy.
//
//==========================================================================
void R_MapPlane(int y, int x1, int x2)
{
angle_t angle;
fixed_t distance, length;
unsigned index;
#ifdef RANGECHECK
if(x2 < x1 || x1 < 0 || x2 >= viewwidth || (unsigned)y > viewheight)
{
I_Error("R_MapPlane: %i, %i at %i", x1, x2, y);
}
#endif
if(planeheight != cachedheight[y])
{
cachedheight[y] = planeheight;
distance = cacheddistance[y] = FixedMul(planeheight, yslope[y]);
ds_xstep = cachedxstep[y] = FixedMul(distance, basexscale);
ds_ystep = cachedystep[y] = FixedMul(distance, baseyscale);
}
else
{
distance = cacheddistance[y];
ds_xstep = cachedxstep[y];
ds_ystep = cachedystep[y];
}
length = FixedMul(distance, distscale[x1]);
angle = (viewangle+xtoviewangle[x1])>>ANGLETOFINESHIFT;
ds_xfrac = viewx+FixedMul(finecosine[angle], length);
ds_yfrac = -viewy-FixedMul(finesine[angle], length);
if(fixedcolormap)
{
ds_colormap = fixedcolormap;
}
else
{
index = distance >> LIGHTZSHIFT;
if(index >= MAXLIGHTZ )
{
index = MAXLIGHTZ-1;
}
ds_colormap = planezlight[index];
}
ds_y = y;
ds_x1 = x1;
ds_x2 = x2;
spanfunc(); // High or low detail
}
//==========================================================================
//
// R_ClearPlanes
//
// Called at the beginning of each frame.
//
//==========================================================================
void R_ClearPlanes(void)
{
int i;
angle_t angle;
// Opening / clipping determination
for(i = 0; i < viewwidth; i++)
{
floorclip[i] = viewheight;
ceilingclip[i] = -1;
}
lastvisplane = visplanes;
lastopening = openings;
// Texture calculation
memset(cachedheight, 0, sizeof(cachedheight));
angle = (viewangle-ANG90)>>ANGLETOFINESHIFT; // left to right mapping
// Scale will be unit scale at SCREENWIDTH/2 distance
basexscale = FixedDiv(finecosine[angle], centerxfrac);
baseyscale = -FixedDiv(finesine[angle], centerxfrac);
}
//==========================================================================
//
// R_FindPlane
//
//==========================================================================
visplane_t *R_FindPlane(fixed_t height, int picnum,
int lightlevel, int special)
{
visplane_t *check;
if(special < 150)
{ // Don't let low specials affect search
special = 0;
}
if(picnum == skyflatnum)
{ // All skies map together
height = 0;
lightlevel = 0;
}
for(check = visplanes; check < lastvisplane; check++)
{
if(height == check->height
&& picnum == check->picnum
&& lightlevel == check->lightlevel
&& special == check->special)
break;
}
if(check < lastvisplane)
{
return(check);
}
if(lastvisplane-visplanes == MAXVISPLANES)
{
I_Error("R_FindPlane: no more visplanes");
}
lastvisplane++;
check->height = height;
check->picnum = picnum;
check->lightlevel = lightlevel;
check->special = special;
check->minx = SCREENWIDTH;
check->maxx = -1;
memset(check->top, 0xff, sizeof(check->top));
return(check);
}
//==========================================================================
//
// R_CheckPlane
//
//==========================================================================
visplane_t *R_CheckPlane(visplane_t *pl, int start, int stop)
{
int intrl, intrh;
int unionl, unionh;
int x;
if(start < pl->minx)
{
intrl = pl->minx;
unionl = start;
}
else
{
unionl = pl->minx;
intrl = start;
}
if(stop > pl->maxx)
{
intrh = pl->maxx;
unionh = stop;
}
else
{
unionh = pl->maxx;
intrh = stop;
}
for(x = intrl; x <= intrh; x++)
{
if(pl->top[x] != 0xff)
{
break;
}
}
if(x > intrh)
{
pl->minx = unionl;
pl->maxx = unionh;
return pl; // use the same visplane
}
// Make a new visplane
lastvisplane->height = pl->height;
lastvisplane->picnum = pl->picnum;
lastvisplane->lightlevel = pl->lightlevel;
lastvisplane->special = pl->special;
pl = lastvisplane++;
pl->minx = start;
pl->maxx = stop;
memset(pl->top, 0xff, sizeof(pl->top));
return pl;
}
//==========================================================================
//
// R_MakeSpans
//
//==========================================================================
void R_MakeSpans(int x, int t1, int b1, int t2, int b2)
{
while(t1 < t2 && t1 <= b1)
{
R_MapPlane(t1, spanstart[t1], x-1);
t1++;
}
while(b1 > b2 && b1 >= t1)
{
R_MapPlane(b1, spanstart[b1], x-1);
b1--;
}
while(t2 < t1 && t2 <= b2)
{
spanstart[t2] = x;
t2++;
}
while(b2 > b1 && b2 >= t2)
{
spanstart[b2] = x;
b2--;
}
}
//==========================================================================
//
// R_DrawPlanes
//
//==========================================================================
#define SKYTEXTUREMIDSHIFTED 200
void R_DrawPlanes(void)
{
visplane_t *pl;
int light;
int x, stop;
int angle;
byte *tempSource;
byte *source;
byte *source2;
byte *dest;
int count;
int offset;
int skyTexture;
int offset2;
int skyTexture2;
int scrollOffset;
extern byte *ylookup[MAXHEIGHT];
extern int columnofs[MAXWIDTH];
#ifdef RANGECHECK
if(ds_p-drawsegs > MAXDRAWSEGS)
{
I_Error("R_DrawPlanes: drawsegs overflow (%i)", ds_p-drawsegs);
}
if(lastvisplane-visplanes > MAXVISPLANES)
{
I_Error("R_DrawPlanes: visplane overflow (%i)",
lastvisplane-visplanes);
}
if(lastopening-openings > MAXOPENINGS)
{
I_Error("R_DrawPlanes: opening overflow (%i)",
lastopening-openings);
}
#endif
for(pl = visplanes; pl < lastvisplane; pl++)
{
if(pl->minx > pl->maxx)
{
continue;
}
if(pl->picnum == skyflatnum)
{ // Sky flat
if(DoubleSky)
{ // Render 2 layers, sky 1 in front
offset = Sky1ColumnOffset>>16;
skyTexture = texturetranslation[Sky1Texture];
offset2 = Sky2ColumnOffset>>16;
skyTexture2 = texturetranslation[Sky2Texture];
for(x = pl->minx; x <= pl->maxx; x++)
{
dc_yl = pl->top[x];
dc_yh = pl->bottom[x];
if(dc_yl <= dc_yh)
{
count = dc_yh-dc_yl;
if(count < 0)
{
return;
}
angle = (viewangle+xtoviewangle[x])
>>ANGLETOSKYSHIFT;
source = R_GetColumn(skyTexture, angle+offset)
+SKYTEXTUREMIDSHIFTED+(dc_yl-centery);
source2 = R_GetColumn(skyTexture2, angle+offset2)
+SKYTEXTUREMIDSHIFTED+(dc_yl-centery);
dest = ylookup[dc_yl]+columnofs[x];
do
{
if(*source)
{
*dest = *source++;
source2++;
}
else
{
*dest = *source2++;
source++;
}
dest += SCREENWIDTH;
} while(count--);
}
}
continue; // Next visplane
}
else
{ // Render single layer
if(pl->special == 200)
{ // Use sky 2
offset = Sky2ColumnOffset>>16;
skyTexture = texturetranslation[Sky2Texture];
}
else
{ // Use sky 1
offset = Sky1ColumnOffset>>16;
skyTexture = texturetranslation[Sky1Texture];
}
for(x = pl->minx; x <= pl->maxx; x++)
{
dc_yl = pl->top[x];
dc_yh = pl->bottom[x];
if(dc_yl <= dc_yh)
{
count = dc_yh-dc_yl;
if(count < 0)
{
return;
}
angle = (viewangle+xtoviewangle[x])
>>ANGLETOSKYSHIFT;
source = R_GetColumn(skyTexture, angle+offset)
+SKYTEXTUREMIDSHIFTED+(dc_yl-centery);
dest = ylookup[dc_yl]+columnofs[x];
do
{
*dest = *source++;
dest += SCREENWIDTH;
} while(count--);
}
}
continue; // Next visplane
}
}
// Regular flat
tempSource = W_CacheLumpNum(firstflat+
flattranslation[pl->picnum], PU_STATIC);
scrollOffset = leveltime>>1&63;
switch(pl->special)
{ // Handle scrolling flats
case 201: case 202: case 203: // Scroll_North_xxx
ds_source = tempSource+((scrollOffset
<<(pl->special-201)&63)<<6);
break;
case 204: case 205: case 206: // Scroll_East_xxx
ds_source = tempSource+((63-scrollOffset)
<<(pl->special-204)&63);
break;
case 207: case 208: case 209: // Scroll_South_xxx
ds_source = tempSource+(((63-scrollOffset)
<<(pl->special-207)&63)<<6);
break;
case 210: case 211: case 212: // Scroll_West_xxx
ds_source = tempSource+(scrollOffset
<<(pl->special-210)&63);
break;
case 213: case 214: case 215: // Scroll_NorthWest_xxx
ds_source = tempSource+(scrollOffset
<<(pl->special-213)&63)+((scrollOffset
<<(pl->special-213)&63)<<6);
break;
case 216: case 217: case 218: // Scroll_NorthEast_xxx
ds_source = tempSource+((63-scrollOffset)
<<(pl->special-216)&63)+((scrollOffset
<<(pl->special-216)&63)<<6);
break;
case 219: case 220: case 221: // Scroll_SouthEast_xxx
ds_source = tempSource+((63-scrollOffset)
<<(pl->special-219)&63)+(((63-scrollOffset)
<<(pl->special-219)&63)<<6);
break;
case 222: case 223: case 224: // Scroll_SouthWest_xxx
ds_source = tempSource+(scrollOffset
<<(pl->special-222)&63)+(((63-scrollOffset)
<<(pl->special-222)&63)<<6);
break;
default:
ds_source = tempSource;
break;
}
planeheight = abs(pl->height-viewz);
light = (pl->lightlevel >> LIGHTSEGSHIFT)+extralight;
if(light >= LIGHTLEVELS)
{
light = LIGHTLEVELS-1;
}
if(light < 0)
{
light = 0;
}
planezlight = zlight[light];
pl->top[pl->maxx+1] = 0xff;
pl->top[pl->minx-1] = 0xff;
stop = pl->maxx+1;
for(x = pl->minx; x <= stop; x++)
{
R_MakeSpans(x, pl->top[x-1], pl->bottom[x-1],
pl->top[x], pl->bottom[x]);
}
Z_ChangeTag(tempSource, PU_CACHE);
}
}