ref: 8188b4f4f0e07b6669e6ae3c6c1099af917eaab4
dir: /sys/src/games/doom/r_things.c/
// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// $Log:$
//
// DESCRIPTION:
// Refresh of things, i.e. objects represented by sprites.
//
//-----------------------------------------------------------------------------
static const char
rcsid[] = "$Id: r_things.c,v 1.5 1997/02/03 16:47:56 b1 Exp $";
#include "doomdef.h"
#include "m_swap.h"
#include "i_system.h"
#include "z_zone.h"
#include "w_wad.h"
#include "r_local.h"
#include "doomstat.h"
#define MINZ (FRACUNIT*4)
#define BASEYCENTER 100
//void R_DrawColumn (void);
//void R_DrawFuzzColumn (void);
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;
lighttable_t** spritelights;
// constant arrays
// used for psprite clipping and initializing clipping
short negonearray[SCREENWIDTH];
short screenheightarray[SCREENWIDTH];
//
// INITIALIZATION FUNCTIONS
//
// variables used to look up
// and range check thing_t sprites patches
spritedef_t* sprites;
int numsprites;
spriteframe_t sprtemp[29];
int maxframe;
char* spritename;
//
// R_InstallSpriteLump
// Local function for R_InitSprites.
//
void
R_InstallSpriteLump
( int lump,
unsigned frame,
unsigned rotation,
boolean flipped )
{
int r;
if (frame >= 29 || 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
if (sprtemp[frame].rotate == false)
I_Error ("R_InitSprites: Sprite %s frame %c has "
"multip rot=0 lump", spritename, 'A'+frame);
if (sprtemp[frame].rotate == true)
I_Error ("R_InitSprites: Sprite %s frame %c has rotations "
"and a rot=0 lump", spritename, 'A'+frame);
sprtemp[frame].rotate = false;
for (r=0 ; r<8 ; r++)
{
sprtemp[frame].lump[r] = lump - firstspritelump;
sprtemp[frame].flip[r] = (byte)flipped;
}
return;
}
// the lump is only used for one rotation
if (sprtemp[frame].rotate == false)
I_Error ("R_InitSprites: Sprite %s frame %c has rotations "
"and a rot=0 lump", spritename, 'A'+frame);
sprtemp[frame].rotate = true;
// make 0 based
rotation--;
if (sprtemp[frame].lump[rotation] != -1)
I_Error ("R_InitSprites: Sprite %s : %c : %c "
"has two lumps mapped to it",
spritename, 'A'+frame, '1'+rotation);
sprtemp[frame].lump[rotation] = lump - firstspritelump;
sprtemp[frame].flip[rotation] = (byte)flipped;
}
//
// 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 inconsistant.
// 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.
//
void R_InitSpriteDefs (char** namelist)
{
/* char** check; */
int i;
int l;
int frame;
int rotation;
int start;
int end;
int patched;
char* name;
/* BUG
This would work if the namelist was NULL terminated which it is not.
The array comes from info.c which is limited to NUMSPRITES, so simply
use NUMSPRITES for numsprites.. simple.
This is left here in case a decision is made to make it NULL terminated.
// count the number of sprite names
check = namelist;
while (*check != NULL)
check++;
numsprites = check-namelist;
if (!numsprites)
return;
*/
numsprites = NUMSPRITES;
sprites = Z_Malloc(numsprites *sizeof(*sprites), PU_STATIC, NULL);
start = firstspritelump-1;
end = lastspritelump+1;
// scan all the lump names for each of the names,
// noting the highest frame letter.
// Just compare 4 characters as ints
for (i=0 ; i<numsprites ; i++)
{
spritename = namelist[i];
memset (sprtemp,-1, sizeof(sprtemp));
maxframe = -1;
name = namelist[i];
// scan the lumps,
// filling in the frames for whatever is found
for (l=start+1 ; l<end ; l++)
{
if (memcmp(lumpinfo[l].name, name, 4) == 0)
{
frame = lumpinfo[l].name[4] - 'A';
rotation = lumpinfo[l].name[5] - '0';
if (modifiedgame)
patched = W_GetNumForName (lumpinfo[l].name);
else
patched = l;
R_InstallSpriteLump (patched, frame, rotation, false);
if (lumpinfo[l].name[6])
{
frame = lumpinfo[l].name[6] - 'A';
rotation = lumpinfo[l].name[7] - '0';
R_InstallSpriteLump (l, frame, rotation, true);
}
}
}
// check the frames that were found for completeness
if (maxframe == -1)
{
sprites[i].numframes = 0;
continue;
}
maxframe++;
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 %s frame %c", namelist[i], frame+'A');
break;
case 0:
// only the first rotation is needed
break;
case 1:
// must have all 8 frames
for (rotation=0 ; rotation<8 ; rotation++)
if (sprtemp[frame].lump[rotation] == -1)
I_Error ("R_InitSprites: Sprite %s frame %c "
"is missing rotations",
namelist[i], frame+'A');
break;
}
}
// allocate space for the frames present and copy sprtemp to it
sprites[i].numframes = maxframe;
sprites[i].spriteframes =
Z_Malloc (maxframe * sizeof(spriteframe_t), PU_STATIC, NULL);
memcpy (sprites[i].spriteframes, sprtemp, maxframe*sizeof(spriteframe_t));
}
}
//
// GAME FUNCTIONS
//
vissprite_t vissprites[MAXVISSPRITES];
vissprite_t* vissprite_p;
int newvissprite;
//
// R_InitSprites
// Called at program start.
//
void R_InitSprites (char** namelist)
{
int i;
for (i=0 ; i<SCREENWIDTH ; i++)
{
negonearray[i] = -1;
}
R_InitSpriteDefs (namelist);
}
//
// R_ClearSprites
// Called at frame start.
//
void R_ClearSprites (void)
{
vissprite_p = vissprites;
}
//
// R_NewVisSprite
//
vissprite_t overflowsprite;
vissprite_t* R_NewVisSprite (void)
{
if (vissprite_p == &vissprites[MAXVISSPRITES])
return &overflowsprite;
vissprite_p++;
return vissprite_p-1;
}
//
// 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 (column_t* column)
{
int topscreen;
int bottomscreen;
fixed_t basetexturemid;
basetexturemid = dc_texturemid;
for ( ; 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;
if (dc_yl <= dc_yh)
{
dc_source = (byte *)column + 3;
dc_texturemid = basetexturemid - (column->topdelta<<FRACBITS);
// dc_source = (byte *)column + 3 - column->topdelta;
// Drawn by either R_DrawColumn
// or (SHADOW) R_DrawFuzzColumn.
colfunc ();
}
column = (column_t *)( (byte *)column + column->length + 4);
}
dc_texturemid = basetexturemid;
}
//
// R_DrawVisSprite
// mfloorclip and mceilingclip should also be set.
//
void
R_DrawVisSprite
( vissprite_t* vis,
int /*x1*/,
int /*x2*/ )
{
column_t* column;
int texturecolumn;
fixed_t frac;
patch_t* patch;
patch = W_CacheLumpNum (vis->patch+firstspritelump, PU_CACHE);
dc_colormap = vis->colormap;
if (!dc_colormap)
{
// NULL colormap = shadow draw
colfunc = fuzzcolfunc;
}
else if (vis->mobjflags & MF_TRANSLATION)
{
colfunc = R_DrawTranslatedColumn;
dc_translation = translationtables - 256 +
( (vis->mobjflags & MF_TRANSLATION) >> (MF_TRANSSHIFT-8) );
}
dc_iscale = abs(vis->xiscale)>>detailshift;
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 = (column_t *) ((byte *)patch +
LONG(patch->columnofs[texturecolumn]));
R_DrawMaskedColumn (column);
}
colfunc = basecolfunc;
}
//
// R_ProjectSprite
// Generates a vissprite for a thing
// if it might be visible.
//
void R_ProjectSprite (mobj_t* thing)
{
fixed_t tr_x;
fixed_t tr_y;
fixed_t gxt;
fixed_t gyt;
fixed_t tx;
fixed_t tz;
fixed_t xscale;
int x1;
int x2;
spritedef_t* sprdef;
spriteframe_t* sprframe;
int lump;
unsigned rot;
boolean flip;
int index;
vissprite_t* vis;
angle_t ang;
fixed_t iscale;
// transform the origin point
tr_x = thing->x - viewx;
tr_y = thing->y - viewy;
gxt = FixedMul(tr_x,viewcos);
gyt = -FixedMul(tr_y,viewsin);
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 (abs(tx)>(tz<<2))
return;
// decide which patch to use for sprite relative to player
#ifdef RANGECHECK
if ((unsigned)thing->sprite >= 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
ang = R_PointToAngle (thing->x, thing->y);
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
tx -= 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;
// store information in a vissprite
vis = R_NewVisSprite ();
vis->mobjflags = thing->flags;
vis->scale = xscale<<detailshift;
vis->gx = thing->x;
vis->gy = thing->y;
vis->gz = thing->z;
vis->gzt = thing->z + spritetopoffset[lump];
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)
{
// shadow draw
vis->colormap = NULL;
}
else if (fixedcolormap)
{
// fixed map
vis->colormap = fixedcolormap;
}
else if (thing->frame & FF_FULLBRIGHT)
{
// full bright
vis->colormap = colormaps;
}
else
{
// diminished light
index = xscale>>(LIGHTSCALESHIFT-detailshift);
if (index >= MAXLIGHTSCALE)
index = MAXLIGHTSCALE-1;
vis->colormap = spritelights[index];
}
}
//
// R_AddSprites
// During BSP traversal, this adds sprites by sector.
//
void R_AddSprites (sector_t* sec)
{
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 = (sec->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;
int 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 >= 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 : %i ",
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;
vis->texturemid = (BASEYCENTER<<FRACBITS)+FRACUNIT/2-(psp->sy-spritetopoffset[lump]);
vis->x1 = x1 < 0 ? 0 : x1;
vis->x2 = x2 >= viewwidth ? viewwidth-1 : x2;
vis->scale = pspritescale<<detailshift;
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)
{
// shadow draw
vis->colormap = NULL;
}
else if (fixedcolormap)
{
// fixed color
vis->colormap = fixedcolormap;
}
else if (psp->state->frame & FF_FULLBRIGHT)
{
// full bright
vis->colormap = colormaps;
}
else
{
// local light
vis->colormap = spritelights[MAXLIGHTSCALE-1];
}
R_DrawVisSprite (vis, vis->x1, vis->x2);
}
//
// R_DrawPlayerSprites
//
void R_DrawPlayerSprites (void)
{
int i;
int 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
//
vissprite_t vsprsortedhead;
void R_SortVisSprites (void)
{
int i;
int count;
vissprite_t* ds;
vissprite_t* best;
vissprite_t unsorted;
fixed_t bestscale;
count = vissprite_p - vissprites;
unsorted.next = unsorted.prev = &unsorted;
if (!count)
return;
for (ds=vissprites ; ds<vissprite_p ; ds++)
{
ds->next = ds+1;
ds->prev = ds-1;
}
vissprites[0].prev = &unsorted;
unsorted.next = &vissprites[0];
(vissprite_p-1)->next = &unsorted;
unsorted.prev = vissprite_p-1;
// pull the vissprites out by scale
vsprsortedhead.next = vsprsortedhead.prev = &vsprsortedhead;
for (best=nil,i=0 ; i<count ; i++)
{
bestscale = MAXINT;
for (ds=unsorted.next ; ds!= &unsorted ; ds=ds->next)
{
if (ds->scale < bestscale)
{
bestscale = ds->scale;
best = ds;
}
}
best->next->prev = best->prev;
best->prev->next = best->next;
best->next = &vsprsortedhead;
best->prev = vsprsortedhead.prev;
vsprsortedhead.prev->next = best;
vsprsortedhead.prev = best;
}
}
//
// R_DrawSprite
//
void R_DrawSprite (vissprite_t* spr)
{
drawseg_t* ds;
short clipbot[SCREENWIDTH];
short cliptop[SCREENWIDTH];
int x;
int r1;
int r2;
fixed_t scale;
fixed_t lowscale;
int silhouette;
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.
for (ds=ds_p-1 ; ds >= drawsegs ; ds--)
{
// determine if the drawseg obscures the sprite
if (ds->x1 > spr->x2
|| ds->x2 < spr->x1
|| (!ds->silhouette
&& !ds->maskedtexturecol) )
{
// does not cover sprite
continue;
}
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) ) )
{
// masked mid texture?
if (ds->maskedtexturecol)
R_RenderMaskedSegRange (ds, r1, r2);
// seg is behind sprite
continue;
}
// clip this piece of the sprite
silhouette = ds->silhouette;
if (spr->gz >= ds->bsilheight)
silhouette &= ~SIL_BOTTOM;
if (spr->gzt <= ds->tsilheight)
silhouette &= ~SIL_TOP;
if (silhouette == 1)
{
// bottom sil
for (x=r1 ; x<=r2 ; x++)
if (clipbot[x] == -2)
clipbot[x] = ds->sprbottomclip[x];
}
else if (silhouette == 2)
{
// top sil
for (x=r1 ; x<=r2 ; x++)
if (cliptop[x] == -2)
cliptop[x] = ds->sprtopclip[x];
}
else if (silhouette == 3)
{
// both
for (x=r1 ; x<=r2 ; x++)
{
if (clipbot[x] == -2)
clipbot[x] = ds->sprbottomclip[x];
if (cliptop[x] == -2)
cliptop[x] = ds->sprtopclip[x];
}
}
}
// 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)
{
vissprite_t* spr;
drawseg_t* ds;
R_SortVisSprites ();
if (vissprite_p > vissprites)
{
// draw all vissprites back to front
for (spr = vsprsortedhead.next ;
spr != &vsprsortedhead ;
spr=spr->next)
{
R_DrawSprite (spr);
}
}
// render any remaining masked mid textures
for (ds=ds_p-1 ; ds >= drawsegs ; ds--)
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 ();
}