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foxbox/apps/plugins/doom/r_things.c
Karl Kurbjun b47a43aa28 Doom for the Gigabeat and some code reduction 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12051 a1c6a512-1295-4272-9138-f99709370657
2007-01-17 18:52:24 +00:00

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/* Emacs style mode select -*- C++ -*-
*-----------------------------------------------------------------------------
*
*
* PrBoom a Doom port merged with LxDoom and LSDLDoom
* based on BOOM, a modified and improved DOOM engine
* Copyright (C) 1999 by
* id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
* Copyright (C) 1999-2000 by
* Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
*
* 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 the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* DESCRIPTION:
* Refresh of things, i.e. objects represented by sprites.
*
*-----------------------------------------------------------------------------*/
#include "doomdef.h"
#include "m_swap.h"
#include "doomstat.h"
#include "w_wad.h"
#include "r_main.h"
#include "r_bsp.h"
#include "r_segs.h"
#include "r_draw.h"
#include "r_things.h"
#include "i_system.h"
//#include "lprintf.h"
#include "rockmacros.h"
#define MINZ (FRACUNIT*4)
#define BASEYCENTER 100
typedef struct {
int x1;
int x2;
int column;
int topclip;
int bottomclip;
}
maskdraw_t;
//
// Sprite rotation 0 is facing the viewer,
// rotation 1 is one angle turn CLOCKWISE around the axis.
// This is not the same as the angle,
// which increases counter clockwise (protractor).
// There was a lot of stuff grabbed wrong, so I changed it...
//
fixed_t pspritescale;
fixed_t pspriteiscale;
// proff 11/06/98: Added for high-res
fixed_t pspriteyscale;
static lighttable_t** spritelights;
// constant arrays
// used for psprite clipping and initializing clipping
short negonearray[MAX_SCREENWIDTH];
short screenheightarray[MAX_SCREENWIDTH];
//
// INITIALIZATION FUNCTIONS
//
// variables used to look up and range check thing_t sprites patches
spritedef_t* sprites;
int numsprites;
#define MAX_SPRITE_FRAMES 29 /* Macroized -- killough 1/25/98 */
static spriteframe_t sprtemp[MAX_SPRITE_FRAMES];
static int maxframe;
//
// R_InstallSpriteLump
// Local function for R_InitSprites.
//
static void R_InstallSpriteLump(int lump, unsigned frame,
unsigned rotation, boolean flipped)
{
if (frame >= MAX_SPRITE_FRAMES || rotation > 8)
I_Error("R_InstallSpriteLump: Bad frame characters in lump %i", lump);
if ((int)frame > maxframe)
maxframe = frame;
if (rotation == 0)
{ // the lump should be used for all rotations
int r;
for (r=0 ; r<8 ; r++)
if (sprtemp[frame].lump[r]==-1)
{
sprtemp[frame].lump[r] = lump - firstspritelump;
sprtemp[frame].flip[r] = (byte) flipped;
sprtemp[frame].rotate = false; //jff 4/24/98 if any subbed, rotless
}
return;
}
// the lump is only used for one rotation
if (sprtemp[frame].lump[--rotation] == -1)
{
sprtemp[frame].lump[rotation] = lump - firstspritelump;
sprtemp[frame].flip[rotation] = (byte) flipped;
sprtemp[frame].rotate = true; //jff 4/24/98 only change if rot used
}
}
//
// R_InitSpriteDefs
// Pass a null terminated list of sprite names
// (4 chars exactly) to be used.
//
// Builds the sprite rotation matrixes to account
// for horizontally flipped sprites.
//
// Will report an error if the lumps are inconsistent.
// Only called at startup.
//
// Sprite lump names are 4 characters for the actor,
// a letter for the frame, and a number for the rotation.
//
// A sprite that is flippable will have an additional
// letter/number appended.
//
// The rotation character can be 0 to signify no rotations.
//
// 1/25/98, 1/31/98 killough : Rewritten for performance
//
// Empirically verified to have excellent hash
// properties across standard Doom sprites:
#define R_SpriteNameHash(s) ((unsigned)((s)[0]-((s)[1]*3-(s)[3]*2-(s)[2])*2))
void R_InitSpriteDefs(const char * const * namelist)
{
size_t numentries = lastspritelump-firstspritelump+1;
struct {
int index, next;
}
*hash;
int i;
if (!numentries || !*namelist)
return;
// count the number of sprite names
for (i=0; namelist[i]; i++)
;
numsprites = i;
sprites = Z_Malloc(numsprites *sizeof(*sprites), PU_STATIC, NULL);
// Create hash table based on just the first four letters of each sprite
// killough 1/31/98
hash = malloc(sizeof(*hash)*numentries); // allocate hash table
for (i=0; (size_t)i<numentries; i++) // initialize hash table as empty
hash[i].index = -1;
for (i=0; (size_t)i<numentries; i++) // Prepend each sprite to hash chain
{ // prepend so that later ones win
int j = R_SpriteNameHash(lumpinfo[i+firstspritelump].name) % numentries;
hash[i].next = hash[j].index;
hash[j].index = i;
}
// scan all the lump names for each of the names,
// noting the highest frame letter.
for (i=0 ; i<numsprites ; i++)
{
const char *spritename = namelist[i];
int j = hash[R_SpriteNameHash(spritename) % numentries].index;
if (j >= 0)
{
memset(sprtemp, -1, sizeof(sprtemp));
maxframe = -1;
do
{
register lumpinfo_t *lump = lumpinfo + j + firstspritelump;
// Fast portable comparison -- killough
// (using int pointer cast is nonportable):
if (!((lump->name[0] ^ spritename[0]) |
(lump->name[1] ^ spritename[1]) |
(lump->name[2] ^ spritename[2]) |
(lump->name[3] ^ spritename[3])))
{
R_InstallSpriteLump(j+firstspritelump,
lump->name[4] - 'A',
lump->name[5] - '0',
false);
if (lump->name[6])
R_InstallSpriteLump(j+firstspritelump,
lump->name[6] - 'A',
lump->name[7] - '0',
true);
}
}
while ((j = hash[j].next) >= 0)
;
// check the frames that were found for completeness
if ((sprites[i].numframes = ++maxframe)) // killough 1/31/98
{
int frame;
for (frame = 0; frame < maxframe; frame++)
switch ((int) sprtemp[frame].rotate)
{
case -1:
// no rotations were found for that frame at all
I_Error ("R_InitSprites: No patches found "
"for %.8s frame %c", namelist[i], frame+'A');
break;
case 0:
// only the first rotation is needed
break;
case 1:
// must have all 8 frames
{
int rotation;
for (rotation=0 ; rotation<8 ; rotation++)
if (sprtemp[frame].lump[rotation] == -1)
I_Error ("R_InitSprites: Sprite %.8s frame %c "
"is missing rotations",
namelist[i], frame+'A');
break;
}
}
// allocate space for the frames present and copy sprtemp to it
sprites[i].spriteframes =
Z_Malloc (maxframe * sizeof(spriteframe_t), PU_STATIC, NULL);
memcpy (sprites[i].spriteframes, sprtemp,
maxframe*sizeof(spriteframe_t));
}
}
}
free(hash); // free hash table
}
//
// GAME FUNCTIONS
//
static vissprite_t *vissprites, **vissprite_ptrs; // killough
static size_t num_vissprite, num_vissprite_alloc, num_vissprite_ptrs;
//
// R_InitSprites
// Called at program start.
//
void R_InitSprites(const char * const *namelist)
{
int i;
for (i=0 ; i<MAX_SCREENWIDTH ; i++)
negonearray[i] = -1;
R_InitSpriteDefs (namelist);
}
void R_ClearSprites (void)
{
num_vissprite = 0; // killough
}
//
// R_NewVisSprite
//
vissprite_t *R_NewVisSprite(void)
{
if (num_vissprite >= num_vissprite_alloc) // killough
{
num_vissprite_alloc = num_vissprite_alloc ? num_vissprite_alloc*2 : 128;
vissprites = realloc(vissprites,num_vissprite_alloc*sizeof(*vissprites));
}
return vissprites + num_vissprite++;
}
//
// R_DrawMaskedColumn
// Used for sprites and masked mid textures.
// Masked means: partly transparent, i.e. stored
// in posts/runs of opaque pixels.
//
short* mfloorclip;
short* mceilingclip;
fixed_t spryscale;
fixed_t sprtopscreen;
void R_DrawMaskedColumn(const column_t *column)
{
int topscreen;
int bottomscreen;
fixed_t basetexturemid = dc_texturemid;
dc_texheight = 0; // killough 11/98
while (column->topdelta != 0xff)
{
// calculate unclipped screen coordinates for post
topscreen = sprtopscreen + spryscale*column->topdelta;
bottomscreen = topscreen + spryscale*column->length;
dc_yl = (topscreen+FRACUNIT-1)>>FRACBITS;
dc_yh = (bottomscreen-1)>>FRACBITS;
if (dc_yh >= mfloorclip[dc_x])
dc_yh = mfloorclip[dc_x]-1;
if (dc_yl <= mceilingclip[dc_x])
dc_yl = mceilingclip[dc_x]+1;
// killough 3/2/98, 3/27/98: Failsafe against overflow/crash:
if (dc_yl <= dc_yh && dc_yh < viewheight)
{
dc_source = (byte *)column + 3;
dc_texturemid = basetexturemid - (column->topdelta<<FRACBITS);
// Drawn by either R_DrawColumn
// or (SHADOW) R_DrawFuzzColumn.
colfunc ();
}
column = (const column_t *)( (byte *)column + column->length + 4);
}
dc_texturemid = basetexturemid;
}
//
// R_DrawVisSprite
// mfloorclip and mceilingclip should also be set.
//
// CPhipps - new wad lump handling, *'s to const*'s
void R_DrawVisSprite(vissprite_t *vis, int x1, int x2)
{
(void)x1;
(void)x2;
const column_t *column;
int texturecolumn;
fixed_t frac;
const patch_t *patch = W_CacheLumpNum (vis->patch+firstspritelump);
dc_colormap = vis->colormap;
// killough 4/11/98: rearrange and handle translucent sprites
// mixed with translucent/non-translucenct 2s normals
if (!dc_colormap) // NULL colormap = shadow draw
colfunc = R_DrawFuzzColumn; // killough 3/14/98
else
if (vis->mobjflags & MF_TRANSLATION)
{
colfunc = R_DrawTranslatedColumn;
dc_translation = translationtables - 256 +
((vis->mobjflags & MF_TRANSLATION) >> (MF_TRANSSHIFT-8) );
}
else
if (vis->mobjflags & MF_TRANSLUCENT && general_translucency) // phares
{
colfunc = R_DrawTLColumn;
tranmap = main_tranmap; // killough 4/11/98
}
else
colfunc = R_DrawColumn; // killough 3/14/98, 4/11/98
// proff 11/06/98: Changed for high-res
dc_iscale = FixedDiv (FRACUNIT, vis->scale);
dc_texturemid = vis->texturemid;
frac = vis->startfrac;
spryscale = vis->scale;
sprtopscreen = centeryfrac - FixedMul(dc_texturemid,spryscale);
for (dc_x=vis->x1 ; dc_x<=vis->x2 ; dc_x++, frac += vis->xiscale)
{
texturecolumn = frac>>FRACBITS;
#ifdef RANGECHECK
if (texturecolumn < 0 || texturecolumn >= SHORT(patch->width))
I_Error ("R_DrawSpriteRange: Bad texturecolumn");
#endif
column = (const column_t *)((const byte *) patch +
LONG(patch->columnofs[texturecolumn]));
R_DrawMaskedColumn (column);
}
colfunc = R_DrawColumn; // killough 3/14/98
W_UnlockLumpNum(vis->patch+firstspritelump); // cph - release lump
}
//
// R_ProjectSprite
// Generates a vissprite for a thing if it might be visible.
//
void R_ProjectSprite (mobj_t* thing)
{
fixed_t gzt; // killough 3/27/98
fixed_t tx;
fixed_t xscale;
int x1;
int x2;
spritedef_t *sprdef;
spriteframe_t *sprframe;
int lump;
boolean flip;
vissprite_t *vis;
#ifndef GL_DOOM
fixed_t iscale;
#endif
int heightsec; // killough 3/27/98
// transform the origin point
fixed_t tr_x = thing->x - viewx;
fixed_t tr_y = thing->y - viewy;
fixed_t gxt = FixedMul(tr_x,viewcos);
fixed_t gyt = -FixedMul(tr_y,viewsin);
fixed_t tz = gxt-gyt;
// thing is behind view plane?
if (tz < MINZ)
return;
xscale = FixedDiv(projection, tz);
gxt = -FixedMul(tr_x,viewsin);
gyt = FixedMul(tr_y,viewcos);
tx = -(gyt+gxt);
// too far off the side?
if (D_abs(tx)>(tz<<2))
return;
// decide which patch to use for sprite relative to player
#ifdef RANGECHECK
if ((unsigned) thing->sprite >= (unsigned)numsprites)
I_Error ("R_ProjectSprite: Invalid sprite number %i", thing->sprite);
#endif
sprdef = &sprites[thing->sprite];
#ifdef RANGECHECK
if ((thing->frame&FF_FRAMEMASK) >= sprdef->numframes)
I_Error ("R_ProjectSprite: Invalid sprite frame %i : %i", thing->sprite,
thing->frame);
#endif
sprframe = &sprdef->spriteframes[thing->frame & FF_FRAMEMASK];
if (sprframe->rotate)
{
// choose a different rotation based on player view
angle_t ang = R_PointToAngle(thing->x, thing->y);
unsigned rot = (ang-thing->angle+(unsigned)(ANG45/2)*9)>>29;
lump = sprframe->lump[rot];
flip = (boolean) sprframe->flip[rot];
}
else
{
// use single rotation for all views
lump = sprframe->lump[0];
flip = (boolean) sprframe->flip[0];
}
/* calculate edges of the shape
* cph 2003/08/1 - fraggle points out that this offset must be flipped if the
* sprite is flipped; e.g. FreeDoom imp is messed up by this. */
tx -= flip ? spritewidth[lump] - spriteoffset[lump] : spriteoffset[lump];
x1 = (centerxfrac + FixedMul(tx,xscale)) >>FRACBITS;
// off the right side?
if (x1 > viewwidth)
return;
tx += spritewidth[lump];
x2 = ((centerxfrac + FixedMul (tx,xscale) ) >>FRACBITS) - 1;
// off the left side
if (x2 < 0)
return;
gzt = thing->z + spritetopoffset[lump];
// killough 4/9/98: clip things which are out of view due to height
if (thing->z > viewz + FixedDiv(centeryfrac, xscale) ||
gzt < viewz - FixedDiv(centeryfrac-viewheight, xscale))
return;
// killough 3/27/98: exclude things totally separated
// from the viewer, by either water or fake ceilings
// killough 4/11/98: improve sprite clipping for underwater/fake ceilings
heightsec = thing->subsector->sector->heightsec;
if (heightsec != -1) // only clip things which are in special sectors
{
int phs = viewplayer->mo->subsector->sector->heightsec;
if (phs != -1 && viewz < sectors[phs].floorheight ?
thing->z >= sectors[heightsec].floorheight :
gzt < sectors[heightsec].floorheight)
return;
if (phs != -1 && viewz > sectors[phs].ceilingheight ?
gzt < sectors[heightsec].ceilingheight &&
viewz >= sectors[heightsec].ceilingheight :
thing->z >= sectors[heightsec].ceilingheight)
return;
}
// store information in a vissprite
vis = R_NewVisSprite ();
// killough 3/27/98: save sector for special clipping later
vis->heightsec = heightsec;
vis->mobjflags = thing->flags;
// proff 11/06/98: Changed for high-res
vis->scale = FixedDiv(projectiony, tz);
vis->gx = thing->x;
vis->gy = thing->y;
vis->gz = thing->z;
vis->gzt = gzt; // killough 3/27/98
vis->texturemid = vis->gzt - viewz;
vis->x1 = x1 < 0 ? 0 : x1;
vis->x2 = x2 >= viewwidth ? viewwidth-1 : x2;
iscale = FixedDiv (FRACUNIT, xscale);
if (flip)
{
vis->startfrac = spritewidth[lump]-1;
vis->xiscale = -iscale;
}
else
{
vis->startfrac = 0;
vis->xiscale = iscale;
}
if (vis->x1 > x1)
vis->startfrac += vis->xiscale*(vis->x1-x1);
vis->patch = lump;
// get light level
if (thing->flags & MF_SHADOW)
vis->colormap = NULL; // shadow draw
else if (fixedcolormap)
vis->colormap = fixedcolormap; // fixed map
else if (thing->frame & FF_FULLBRIGHT)
vis->colormap = fullcolormap; // full bright // killough 3/20/98
else
{ // diminished light
int index = xscale>>LIGHTSCALESHIFT;
if (index >= MAXLIGHTSCALE)
index = MAXLIGHTSCALE-1;
vis->colormap = spritelights[index];
}
}
//
// R_AddSprites
// During BSP traversal, this adds sprites by sector.
//
// killough 9/18/98: add lightlevel as parameter, fixing underwater lighting
void R_AddSprites(subsector_t* subsec, int lightlevel)
{
sector_t* sec=subsec->sector;
mobj_t *thing;
int lightnum;
// BSP is traversed by subsector.
// A sector might have been split into several
// subsectors during BSP building.
// Thus we check whether its already added.
if (sec->validcount == validcount)
return;
// Well, now it will be done.
sec->validcount = validcount;
lightnum = (lightlevel >> LIGHTSEGSHIFT)+extralight;
if (lightnum < 0)
spritelights = scalelight[0];
else if (lightnum >= LIGHTLEVELS)
spritelights = scalelight[LIGHTLEVELS-1];
else
spritelights = scalelight[lightnum];
// Handle all things in sector.
for (thing = sec->thinglist; thing; thing = thing->snext)
R_ProjectSprite(thing);
}
//
// R_DrawPSprite
//
void R_DrawPSprite (pspdef_t *psp)
{
fixed_t tx;
int x1, x2;
spritedef_t *sprdef;
spriteframe_t *sprframe;
int lump;
boolean flip;
vissprite_t *vis;
vissprite_t avis;
// decide which patch to use
#ifdef RANGECHECK
if ( (unsigned)psp->state->sprite >= (unsigned)numsprites)
I_Error ("R_ProjectSprite: Invalid sprite number %i", psp->state->sprite);
#endif
sprdef = &sprites[psp->state->sprite];
#ifdef RANGECHECK
if ( (psp->state->frame & FF_FRAMEMASK) >= sprdef->numframes)
I_Error ("R_ProjectSprite: Invalid sprite frame %i : %li",
psp->state->sprite, psp->state->frame);
#endif
sprframe = &sprdef->spriteframes[psp->state->frame & FF_FRAMEMASK];
lump = sprframe->lump[0];
flip = (boolean) sprframe->flip[0];
// calculate edges of the shape
tx = psp->sx-160*FRACUNIT;
tx -= spriteoffset[lump];
x1 = (centerxfrac + FixedMul (tx,pspritescale))>>FRACBITS;
// off the right side
if (x1 > viewwidth)
return;
tx += spritewidth[lump];
x2 = ((centerxfrac + FixedMul (tx, pspritescale) ) >>FRACBITS) - 1;
// off the left side
if (x2 < 0)
return;
// store information in a vissprite
vis = &avis;
vis->mobjflags = 0;
// killough 12/98: fix psprite positioning problem
vis->texturemid = (BASEYCENTER<<FRACBITS) /* + FRACUNIT/2 */ -
(psp->sy-spritetopoffset[lump]);
vis->x1 = x1 < 0 ? 0 : x1;
vis->x2 = x2 >= viewwidth ? viewwidth-1 : x2;
// proff 11/06/98: Added for high-res
vis->scale = pspriteyscale;
if (flip)
{
vis->xiscale = -pspriteiscale;
vis->startfrac = spritewidth[lump]-1;
}
else
{
vis->xiscale = pspriteiscale;
vis->startfrac = 0;
}
if (vis->x1 > x1)
vis->startfrac += vis->xiscale*(vis->x1-x1);
vis->patch = lump;
if (viewplayer->powers[pw_invisibility] > 4*32
|| viewplayer->powers[pw_invisibility] & 8)
vis->colormap = NULL; // shadow draw
else if (fixedcolormap)
vis->colormap = fixedcolormap; // fixed color
else if (psp->state->frame & FF_FULLBRIGHT)
vis->colormap = fullcolormap; // full bright // killough 3/20/98
else
vis->colormap = spritelights[MAXLIGHTSCALE-1]; // local light
R_DrawVisSprite(vis, vis->x1, vis->x2);
}
//
// R_DrawPlayerSprites
//
void R_DrawPlayerSprites(void)
{
int i, lightnum;
pspdef_t *psp;
// get light level
lightnum = (viewplayer->mo->subsector->sector->lightlevel >> LIGHTSEGSHIFT)
+ extralight;
if (lightnum < 0)
spritelights = scalelight[0];
else if (lightnum >= LIGHTLEVELS)
spritelights = scalelight[LIGHTLEVELS-1];
else
spritelights = scalelight[lightnum];
// clip to screen bounds
mfloorclip = screenheightarray;
mceilingclip = negonearray;
// add all active psprites
for (i=0, psp=viewplayer->psprites; i<NUMPSPRITES; i++,psp++)
if (psp->state)
R_DrawPSprite (psp);
}
//
// R_SortVisSprites
//
// Rewritten by Lee Killough to avoid using unnecessary
// linked lists, and to use faster sorting algorithm.
//
#define bcopyp(d, s, n) memcpy(d, s, (n) * sizeof(void *))
// killough 9/2/98: merge sort
static void msort(vissprite_t **s, vissprite_t **t, int n)
{
if (n >= 16)
{
int n1 = n/2, n2 = n - n1;
vissprite_t **s1 = s, **s2 = s + n1, **d = t;
msort(s1, t, n1);
msort(s2, t, n2);
while ((*s1)->scale > (*s2)->scale ?
(*d++ = *s1++, --n1) : (*d++ = *s2++, --n2))
;
if (n2)
bcopyp(d, s2, n2);
else
bcopyp(d, s1, n1);
bcopyp(s, t, n);
}
else
{
int i;
for (i = 1; i < n; i++)
{
vissprite_t *temp = s[i];
if (s[i-1]->scale < temp->scale)
{
int j = i;
while ((s[j] = s[j-1])->scale < temp->scale && --j)
;
s[j] = temp;
}
}
}
}
void R_SortVisSprites (void)
{
if (num_vissprite)
{
int i = num_vissprite;
// If we need to allocate more pointers for the vissprites,
// allocate as many as were allocated for sprites -- killough
// killough 9/22/98: allocate twice as many
if (num_vissprite_ptrs < num_vissprite*2)
{
free(vissprite_ptrs); // better than realloc -- no preserving needed
vissprite_ptrs = malloc((num_vissprite_ptrs = num_vissprite_alloc*2)
* sizeof *vissprite_ptrs);
}
while (--i>=0)
vissprite_ptrs[i] = vissprites+i;
// killough 9/22/98: replace qsort with merge sort, since the keys
// are roughly in order to begin with, due to BSP rendering.
msort(vissprite_ptrs, vissprite_ptrs + num_vissprite, num_vissprite);
}
}
//
// R_DrawSprite
//
void R_DrawSprite (vissprite_t* spr)
{
drawseg_t *ds;
short clipbot[MAX_SCREENWIDTH]; // killough 2/8/98:
short cliptop[MAX_SCREENWIDTH]; // change to MAX_*
int x;
int r1;
int r2;
fixed_t scale;
fixed_t lowscale;
for (x = spr->x1 ; x<=spr->x2 ; x++)
clipbot[x] = cliptop[x] = -2;
// Scan drawsegs from end to start for obscuring segs.
// The first drawseg that has a greater scale is the clip seg.
// Modified by Lee Killough:
// (pointer check was originally nonportable
// and buggy, by going past LEFT end of array):
// for (ds=ds_p-1 ; ds >= drawsegs ; ds--) old buggy code
for (ds=ds_p ; ds-- > drawsegs ; ) // new -- killough
{ // determine if the drawseg obscures the sprite
if (ds->x1 > spr->x2 || ds->x2 < spr->x1 ||
(!ds->silhouette && !ds->maskedtexturecol))
continue; // does not cover sprite
r1 = ds->x1 < spr->x1 ? spr->x1 : ds->x1;
r2 = ds->x2 > spr->x2 ? spr->x2 : ds->x2;
if (ds->scale1 > ds->scale2)
{
lowscale = ds->scale2;
scale = ds->scale1;
}
else
{
lowscale = ds->scale1;
scale = ds->scale2;
}
if (scale < spr->scale || (lowscale < spr->scale &&
!R_PointOnSegSide (spr->gx, spr->gy, ds->curline)))
{
if (ds->maskedtexturecol) // masked mid texture?
R_RenderMaskedSegRange(ds, r1, r2);
continue; // seg is behind sprite
}
// clip this piece of the sprite
// killough 3/27/98: optimized and made much shorter
if (ds->silhouette&SIL_BOTTOM && spr->gz < ds->bsilheight) //bottom sil
for (x=r1 ; x<=r2 ; x++)
if (clipbot[x] == -2)
clipbot[x] = ds->sprbottomclip[x];
if (ds->silhouette&SIL_TOP && spr->gzt > ds->tsilheight) // top sil
for (x=r1 ; x<=r2 ; x++)
if (cliptop[x] == -2)
cliptop[x] = ds->sprtopclip[x];
}
// killough 3/27/98:
// Clip the sprite against deep water and/or fake ceilings.
// killough 4/9/98: optimize by adding mh
// killough 4/11/98: improve sprite clipping for underwater/fake ceilings
// killough 11/98: fix disappearing sprites
if (spr->heightsec != -1) // only things in specially marked sectors
{
fixed_t h,mh;
int phs = viewplayer->mo->subsector->sector->heightsec;
if ((mh = sectors[spr->heightsec].floorheight) > spr->gz &&
(h = centeryfrac - FixedMul(mh-=viewz, spr->scale)) >= 0 &&
(h >>= FRACBITS) < viewheight)
{
if (mh <= 0 || (phs != -1 && viewz > sectors[phs].floorheight))
{ // clip bottom
for (x=spr->x1 ; x<=spr->x2 ; x++)
if (clipbot[x] == -2 || h < clipbot[x])
clipbot[x] = h;
}
else // clip top
if (phs != -1 && viewz <= sectors[phs].floorheight) // killough 11/98
for (x=spr->x1 ; x<=spr->x2 ; x++)
if (cliptop[x] == -2 || h > cliptop[x])
cliptop[x] = h;
}
if ((mh = sectors[spr->heightsec].ceilingheight) < spr->gzt &&
(h = centeryfrac - FixedMul(mh-viewz, spr->scale)) >= 0 &&
(h >>= FRACBITS) < viewheight)
{
if (phs != -1 && viewz >= sectors[phs].ceilingheight)
{ // clip bottom
for (x=spr->x1 ; x<=spr->x2 ; x++)
if (clipbot[x] == -2 || h < clipbot[x])
clipbot[x] = h;
}
else // clip top
for (x=spr->x1 ; x<=spr->x2 ; x++)
if (cliptop[x] == -2 || h > cliptop[x])
cliptop[x] = h;
}
}
// killough 3/27/98: end special clipping for deep water / fake ceilings
// all clipping has been performed, so draw the sprite
// check for unclipped columns
for (x = spr->x1 ; x<=spr->x2 ; x++)
{
if (clipbot[x] == -2)
clipbot[x] = viewheight;
if (cliptop[x] == -2)
cliptop[x] = -1;
}
mfloorclip = clipbot;
mceilingclip = cliptop;
R_DrawVisSprite (spr, spr->x1, spr->x2);
}
//
// R_DrawMasked
//
void R_DrawMasked(void)
{
int i;
drawseg_t *ds;
R_SortVisSprites();
// draw all vissprites back to front
// rendered_vissprites = num_vissprite;
for (i = num_vissprite ;--i>=0; )
R_DrawSprite(vissprite_ptrs[i]); // killough
// render any remaining masked mid textures
// Modified by Lee Killough:
// (pointer check was originally nonportable
// and buggy, by going past LEFT end of array):
// for (ds=ds_p-1 ; ds >= drawsegs ; ds--) old buggy code
for (ds=ds_p ; ds-- > drawsegs ; ) // new -- killough
if (ds->maskedtexturecol)
R_RenderMaskedSegRange(ds, ds->x1, ds->x2);
// draw the psprites on top of everything
// but does not draw on side views
if (!viewangleoffset)
R_DrawPlayerSprites ();
}
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