mirror of
https://git.code.sf.net/p/quake/quake2forge
synced 2024-12-14 14:41:41 +00:00
1263 lines
30 KiB
C
1263 lines
30 KiB
C
/*
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Copyright (C) 1997-2001 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <assert.h>
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#include "r_local.h"
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#define AFFINE_SPANLET_SIZE 16
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#define AFFINE_SPANLET_SIZE_BITS 4
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typedef struct
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{
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byte *pbase, *pdest;
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short *pz;
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fixed16_t s, t;
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fixed16_t sstep, tstep;
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int izi, izistep, izistep_times_2;
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int spancount;
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unsigned u, v;
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} spanletvars_t;
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spanletvars_t s_spanletvars;
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static int r_polyblendcolor;
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static espan_t *s_polygon_spans;
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polydesc_t r_polydesc;
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msurface_t *r_alpha_surfaces;
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extern int *r_turb_turb;
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static int clip_current;
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vec5_t r_clip_verts[2][MAXWORKINGVERTS+2];
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static int s_minindex, s_maxindex;
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static void R_DrawPoly( int iswater );
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/*
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** R_DrawSpanletOpaque
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*/
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void R_DrawSpanletOpaque( void )
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{
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unsigned btemp;
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do
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{
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unsigned ts, tt;
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ts = s_spanletvars.s >> 16;
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tt = s_spanletvars.t >> 16;
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btemp = *(s_spanletvars.pbase + (ts) + (tt) * cachewidth);
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if (btemp != 255)
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{
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if (*s_spanletvars.pz <= (s_spanletvars.izi >> 16))
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{
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*s_spanletvars.pz = s_spanletvars.izi >> 16;
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*s_spanletvars.pdest = btemp;
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}
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}
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s_spanletvars.izi += s_spanletvars.izistep;
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s_spanletvars.pdest++;
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s_spanletvars.pz++;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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} while (--s_spanletvars.spancount > 0);
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}
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/*
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** R_DrawSpanletTurbulentStipple33
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*/
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void R_DrawSpanletTurbulentStipple33( void )
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{
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unsigned btemp;
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int sturb, tturb;
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byte *pdest = s_spanletvars.pdest;
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short *pz = s_spanletvars.pz;
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int izi = s_spanletvars.izi;
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if ( s_spanletvars.v & 1 )
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{
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s_spanletvars.pdest += s_spanletvars.spancount;
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s_spanletvars.pz += s_spanletvars.spancount;
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if ( s_spanletvars.spancount == AFFINE_SPANLET_SIZE )
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s_spanletvars.izi += s_spanletvars.izistep << AFFINE_SPANLET_SIZE_BITS;
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else
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s_spanletvars.izi += s_spanletvars.izistep * s_spanletvars.izistep;
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if ( s_spanletvars.u & 1 )
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{
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izi += s_spanletvars.izistep;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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pdest++;
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pz++;
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s_spanletvars.spancount--;
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}
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s_spanletvars.sstep *= 2;
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s_spanletvars.tstep *= 2;
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while ( s_spanletvars.spancount > 0 )
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{
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sturb = ((s_spanletvars.s + r_turb_turb[(s_spanletvars.t>>16)&(CYCLE-1)])>>16)&63;
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tturb = ((s_spanletvars.t + r_turb_turb[(s_spanletvars.s>>16)&(CYCLE-1)])>>16)&63;
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btemp = *( s_spanletvars.pbase + ( sturb ) + ( tturb << 6 ) );
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if ( *pz <= ( izi >> 16 ) )
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*pdest = btemp;
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izi += s_spanletvars.izistep_times_2;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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pdest += 2;
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pz += 2;
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s_spanletvars.spancount -= 2;
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}
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}
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}
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/*
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** R_DrawSpanletTurbulentStipple66
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*/
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void R_DrawSpanletTurbulentStipple66( void )
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{
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unsigned btemp;
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int sturb, tturb;
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byte *pdest = s_spanletvars.pdest;
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short *pz = s_spanletvars.pz;
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int izi = s_spanletvars.izi;
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if ( !( s_spanletvars.v & 1 ) )
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{
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s_spanletvars.pdest += s_spanletvars.spancount;
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s_spanletvars.pz += s_spanletvars.spancount;
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if ( s_spanletvars.spancount == AFFINE_SPANLET_SIZE )
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s_spanletvars.izi += s_spanletvars.izistep << AFFINE_SPANLET_SIZE_BITS;
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else
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s_spanletvars.izi += s_spanletvars.izistep * s_spanletvars.izistep;
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if ( s_spanletvars.u & 1 )
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{
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izi += s_spanletvars.izistep;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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pdest++;
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pz++;
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s_spanletvars.spancount--;
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}
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s_spanletvars.sstep *= 2;
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s_spanletvars.tstep *= 2;
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while ( s_spanletvars.spancount > 0 )
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{
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sturb = ((s_spanletvars.s + r_turb_turb[(s_spanletvars.t>>16)&(CYCLE-1)])>>16)&63;
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tturb = ((s_spanletvars.t + r_turb_turb[(s_spanletvars.s>>16)&(CYCLE-1)])>>16)&63;
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btemp = *( s_spanletvars.pbase + ( sturb ) + ( tturb << 6 ) );
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if ( *pz <= ( izi >> 16 ) )
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*pdest = btemp;
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izi += s_spanletvars.izistep_times_2;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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pdest += 2;
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pz += 2;
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s_spanletvars.spancount -= 2;
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}
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}
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else
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{
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s_spanletvars.pdest += s_spanletvars.spancount;
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s_spanletvars.pz += s_spanletvars.spancount;
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if ( s_spanletvars.spancount == AFFINE_SPANLET_SIZE )
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s_spanletvars.izi += s_spanletvars.izistep << AFFINE_SPANLET_SIZE_BITS;
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else
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s_spanletvars.izi += s_spanletvars.izistep * s_spanletvars.izistep;
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while ( s_spanletvars.spancount > 0 )
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{
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sturb = ((s_spanletvars.s + r_turb_turb[(s_spanletvars.t>>16)&(CYCLE-1)])>>16)&63;
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tturb = ((s_spanletvars.t + r_turb_turb[(s_spanletvars.s>>16)&(CYCLE-1)])>>16)&63;
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btemp = *( s_spanletvars.pbase + ( sturb ) + ( tturb << 6 ) );
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if ( *pz <= ( izi >> 16 ) )
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*pdest = btemp;
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izi += s_spanletvars.izistep;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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pdest++;
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pz++;
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s_spanletvars.spancount--;
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}
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}
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}
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/*
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** R_DrawSpanletTurbulentBlended
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*/
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void R_DrawSpanletTurbulentBlended66( void )
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{
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unsigned btemp;
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int sturb, tturb;
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do
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{
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sturb = ((s_spanletvars.s + r_turb_turb[(s_spanletvars.t>>16)&(CYCLE-1)])>>16)&63;
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tturb = ((s_spanletvars.t + r_turb_turb[(s_spanletvars.s>>16)&(CYCLE-1)])>>16)&63;
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btemp = *( s_spanletvars.pbase + ( sturb ) + ( tturb << 6 ) );
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if ( *s_spanletvars.pz <= ( s_spanletvars.izi >> 16 ) )
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*s_spanletvars.pdest = vid.alphamap[btemp*256+*s_spanletvars.pdest];
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s_spanletvars.izi += s_spanletvars.izistep;
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s_spanletvars.pdest++;
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s_spanletvars.pz++;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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} while ( --s_spanletvars.spancount > 0 );
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}
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void R_DrawSpanletTurbulentBlended33( void )
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{
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unsigned btemp;
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int sturb, tturb;
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do
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{
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sturb = ((s_spanletvars.s + r_turb_turb[(s_spanletvars.t>>16)&(CYCLE-1)])>>16)&63;
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tturb = ((s_spanletvars.t + r_turb_turb[(s_spanletvars.s>>16)&(CYCLE-1)])>>16)&63;
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btemp = *( s_spanletvars.pbase + ( sturb ) + ( tturb << 6 ) );
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if ( *s_spanletvars.pz <= ( s_spanletvars.izi >> 16 ) )
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*s_spanletvars.pdest = vid.alphamap[btemp+*s_spanletvars.pdest*256];
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s_spanletvars.izi += s_spanletvars.izistep;
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s_spanletvars.pdest++;
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s_spanletvars.pz++;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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} while ( --s_spanletvars.spancount > 0 );
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}
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/*
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** R_DrawSpanlet33
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*/
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void R_DrawSpanlet33( void )
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{
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unsigned btemp;
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do
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{
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unsigned ts, tt;
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ts = s_spanletvars.s >> 16;
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tt = s_spanletvars.t >> 16;
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btemp = *(s_spanletvars.pbase + (ts) + (tt) * cachewidth);
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if ( btemp != 255 )
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{
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if (*s_spanletvars.pz <= (s_spanletvars.izi >> 16))
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{
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*s_spanletvars.pdest = vid.alphamap[btemp+*s_spanletvars.pdest*256];
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}
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}
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s_spanletvars.izi += s_spanletvars.izistep;
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s_spanletvars.pdest++;
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s_spanletvars.pz++;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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} while (--s_spanletvars.spancount > 0);
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}
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void R_DrawSpanletConstant33( void )
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{
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do
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{
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if (*s_spanletvars.pz <= (s_spanletvars.izi >> 16))
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{
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*s_spanletvars.pdest = vid.alphamap[r_polyblendcolor+*s_spanletvars.pdest*256];
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}
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s_spanletvars.izi += s_spanletvars.izistep;
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s_spanletvars.pdest++;
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s_spanletvars.pz++;
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} while (--s_spanletvars.spancount > 0);
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}
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/*
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** R_DrawSpanlet66
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*/
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void R_DrawSpanlet66( void )
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{
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unsigned btemp;
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do
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{
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unsigned ts, tt;
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ts = s_spanletvars.s >> 16;
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tt = s_spanletvars.t >> 16;
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btemp = *(s_spanletvars.pbase + (ts) + (tt) * cachewidth);
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if ( btemp != 255 )
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{
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if (*s_spanletvars.pz <= (s_spanletvars.izi >> 16))
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{
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*s_spanletvars.pdest = vid.alphamap[btemp*256+*s_spanletvars.pdest];
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}
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}
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s_spanletvars.izi += s_spanletvars.izistep;
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s_spanletvars.pdest++;
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s_spanletvars.pz++;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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} while (--s_spanletvars.spancount > 0);
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}
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/*
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** R_DrawSpanlet33Stipple
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*/
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void R_DrawSpanlet33Stipple( void )
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{
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unsigned btemp;
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byte *pdest = s_spanletvars.pdest;
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short *pz = s_spanletvars.pz;
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int izi = s_spanletvars.izi;
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if ( r_polydesc.stipple_parity ^ ( s_spanletvars.v & 1 ) )
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{
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s_spanletvars.pdest += s_spanletvars.spancount;
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s_spanletvars.pz += s_spanletvars.spancount;
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if ( s_spanletvars.spancount == AFFINE_SPANLET_SIZE )
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s_spanletvars.izi += s_spanletvars.izistep << AFFINE_SPANLET_SIZE_BITS;
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else
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s_spanletvars.izi += s_spanletvars.izistep * s_spanletvars.izistep;
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if ( r_polydesc.stipple_parity ^ ( s_spanletvars.u & 1 ) )
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{
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izi += s_spanletvars.izistep;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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pdest++;
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pz++;
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s_spanletvars.spancount--;
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}
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s_spanletvars.sstep *= 2;
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s_spanletvars.tstep *= 2;
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while ( s_spanletvars.spancount > 0 )
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{
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unsigned s = s_spanletvars.s >> 16;
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unsigned t = s_spanletvars.t >> 16;
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btemp = *( s_spanletvars.pbase + ( s ) + ( t * cachewidth ) );
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if ( btemp != 255 )
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{
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if ( *pz <= ( izi >> 16 ) )
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*pdest = btemp;
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}
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izi += s_spanletvars.izistep_times_2;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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pdest += 2;
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pz += 2;
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s_spanletvars.spancount -= 2;
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}
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}
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}
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/*
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** R_DrawSpanlet66Stipple
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*/
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void R_DrawSpanlet66Stipple( void )
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{
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unsigned btemp;
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byte *pdest = s_spanletvars.pdest;
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short *pz = s_spanletvars.pz;
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int izi = s_spanletvars.izi;
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s_spanletvars.pdest += s_spanletvars.spancount;
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s_spanletvars.pz += s_spanletvars.spancount;
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if ( s_spanletvars.spancount == AFFINE_SPANLET_SIZE )
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s_spanletvars.izi += s_spanletvars.izistep << AFFINE_SPANLET_SIZE_BITS;
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else
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s_spanletvars.izi += s_spanletvars.izistep * s_spanletvars.izistep;
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if ( r_polydesc.stipple_parity ^ ( s_spanletvars.v & 1 ) )
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{
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if ( r_polydesc.stipple_parity ^ ( s_spanletvars.u & 1 ) )
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{
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izi += s_spanletvars.izistep;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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pdest++;
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pz++;
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s_spanletvars.spancount--;
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}
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s_spanletvars.sstep *= 2;
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s_spanletvars.tstep *= 2;
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while ( s_spanletvars.spancount > 0 )
|
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{
|
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unsigned s = s_spanletvars.s >> 16;
|
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unsigned t = s_spanletvars.t >> 16;
|
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btemp = *( s_spanletvars.pbase + ( s ) + ( t * cachewidth ) );
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if ( btemp != 255 )
|
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{
|
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if ( *pz <= ( izi >> 16 ) )
|
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*pdest = btemp;
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}
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izi += s_spanletvars.izistep_times_2;
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s_spanletvars.s += s_spanletvars.sstep;
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s_spanletvars.t += s_spanletvars.tstep;
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pdest += 2;
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pz += 2;
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s_spanletvars.spancount -= 2;
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}
|
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}
|
|
else
|
|
{
|
|
while ( s_spanletvars.spancount > 0 )
|
|
{
|
|
unsigned s = s_spanletvars.s >> 16;
|
|
unsigned t = s_spanletvars.t >> 16;
|
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|
|
btemp = *( s_spanletvars.pbase + ( s ) + ( t * cachewidth ) );
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|
|
if ( btemp != 255 )
|
|
{
|
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if ( *pz <= ( izi >> 16 ) )
|
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*pdest = btemp;
|
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}
|
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|
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izi += s_spanletvars.izistep;
|
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s_spanletvars.s += s_spanletvars.sstep;
|
|
s_spanletvars.t += s_spanletvars.tstep;
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|
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pdest++;
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pz++;
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|
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s_spanletvars.spancount--;
|
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}
|
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}
|
|
}
|
|
|
|
/*
|
|
** R_ClipPolyFace
|
|
**
|
|
** Clips the winding at clip_verts[clip_current] and changes clip_current
|
|
** Throws out the back side
|
|
*/
|
|
int R_ClipPolyFace (int nump, clipplane_t *pclipplane)
|
|
{
|
|
int i, outcount;
|
|
float dists[MAXWORKINGVERTS+3];
|
|
float frac, clipdist, *pclipnormal;
|
|
float *in, *instep, *outstep, *vert2;
|
|
|
|
clipdist = pclipplane->dist;
|
|
pclipnormal = pclipplane->normal;
|
|
|
|
// calc dists
|
|
if (clip_current)
|
|
{
|
|
in = r_clip_verts[1][0];
|
|
outstep = r_clip_verts[0][0];
|
|
clip_current = 0;
|
|
}
|
|
else
|
|
{
|
|
in = r_clip_verts[0][0];
|
|
outstep = r_clip_verts[1][0];
|
|
clip_current = 1;
|
|
}
|
|
|
|
instep = in;
|
|
for (i=0 ; i<nump ; i++, instep += sizeof (vec5_t) / sizeof (float))
|
|
{
|
|
dists[i] = DotProduct (instep, pclipnormal) - clipdist;
|
|
}
|
|
|
|
// handle wraparound case
|
|
dists[nump] = dists[0];
|
|
memcpy (instep, in, sizeof (vec5_t));
|
|
|
|
|
|
// clip the winding
|
|
instep = in;
|
|
outcount = 0;
|
|
|
|
for (i=0 ; i<nump ; i++, instep += sizeof (vec5_t) / sizeof (float))
|
|
{
|
|
if (dists[i] >= 0)
|
|
{
|
|
memcpy (outstep, instep, sizeof (vec5_t));
|
|
outstep += sizeof (vec5_t) / sizeof (float);
|
|
outcount++;
|
|
}
|
|
|
|
if (dists[i] == 0 || dists[i+1] == 0)
|
|
continue;
|
|
|
|
if ( (dists[i] > 0) == (dists[i+1] > 0) )
|
|
continue;
|
|
|
|
// split it into a new vertex
|
|
frac = dists[i] / (dists[i] - dists[i+1]);
|
|
|
|
vert2 = instep + sizeof (vec5_t) / sizeof (float);
|
|
|
|
outstep[0] = instep[0] + frac*(vert2[0] - instep[0]);
|
|
outstep[1] = instep[1] + frac*(vert2[1] - instep[1]);
|
|
outstep[2] = instep[2] + frac*(vert2[2] - instep[2]);
|
|
outstep[3] = instep[3] + frac*(vert2[3] - instep[3]);
|
|
outstep[4] = instep[4] + frac*(vert2[4] - instep[4]);
|
|
|
|
outstep += sizeof (vec5_t) / sizeof (float);
|
|
outcount++;
|
|
}
|
|
|
|
return outcount;
|
|
}
|
|
|
|
/*
|
|
** R_PolygonDrawSpans
|
|
*/
|
|
// PGM - iswater was qboolean. changed to allow passing more flags
|
|
void R_PolygonDrawSpans(espan_t *pspan, int iswater )
|
|
{
|
|
int count;
|
|
fixed16_t snext, tnext;
|
|
float sdivz, tdivz, zi, z, du, dv, spancountminus1;
|
|
float sdivzspanletstepu, tdivzspanletstepu, zispanletstepu;
|
|
|
|
s_spanletvars.pbase = cacheblock;
|
|
|
|
//PGM
|
|
if ( iswater & SURF_WARP)
|
|
r_turb_turb = sintable + ((int)(r_newrefdef.time*SPEED)&(CYCLE-1));
|
|
else if (iswater & SURF_FLOWING)
|
|
r_turb_turb = blanktable;
|
|
//PGM
|
|
|
|
sdivzspanletstepu = d_sdivzstepu * AFFINE_SPANLET_SIZE;
|
|
tdivzspanletstepu = d_tdivzstepu * AFFINE_SPANLET_SIZE;
|
|
zispanletstepu = d_zistepu * AFFINE_SPANLET_SIZE;
|
|
|
|
// we count on FP exceptions being turned off to avoid range problems
|
|
s_spanletvars.izistep = (int)(d_zistepu * 0x8000 * 0x10000);
|
|
s_spanletvars.izistep_times_2 = s_spanletvars.izistep * 2;
|
|
|
|
s_spanletvars.pz = 0;
|
|
|
|
do
|
|
{
|
|
s_spanletvars.pdest = (byte *)d_viewbuffer + ( d_scantable[pspan->v] /*r_screenwidth * pspan->v*/) + pspan->u;
|
|
s_spanletvars.pz = d_pzbuffer + (d_zwidth * pspan->v) + pspan->u;
|
|
s_spanletvars.u = pspan->u;
|
|
s_spanletvars.v = pspan->v;
|
|
|
|
count = pspan->count;
|
|
|
|
if (count <= 0)
|
|
goto NextSpan;
|
|
|
|
// calculate the initial s/z, t/z, 1/z, s, and t and clamp
|
|
du = (float)pspan->u;
|
|
dv = (float)pspan->v;
|
|
|
|
sdivz = d_sdivzorigin + dv*d_sdivzstepv + du*d_sdivzstepu;
|
|
tdivz = d_tdivzorigin + dv*d_tdivzstepv + du*d_tdivzstepu;
|
|
|
|
zi = d_ziorigin + dv*d_zistepv + du*d_zistepu;
|
|
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
|
// we count on FP exceptions being turned off to avoid range problems
|
|
s_spanletvars.izi = (int)(zi * 0x8000 * 0x10000);
|
|
|
|
s_spanletvars.s = (int)(sdivz * z) + sadjust;
|
|
s_spanletvars.t = (int)(tdivz * z) + tadjust;
|
|
|
|
if ( !iswater )
|
|
{
|
|
if (s_spanletvars.s > bbextents)
|
|
s_spanletvars.s = bbextents;
|
|
else if (s_spanletvars.s < 0)
|
|
s_spanletvars.s = 0;
|
|
|
|
if (s_spanletvars.t > bbextentt)
|
|
s_spanletvars.t = bbextentt;
|
|
else if (s_spanletvars.t < 0)
|
|
s_spanletvars.t = 0;
|
|
}
|
|
|
|
do
|
|
{
|
|
// calculate s and t at the far end of the span
|
|
if (count >= AFFINE_SPANLET_SIZE )
|
|
s_spanletvars.spancount = AFFINE_SPANLET_SIZE;
|
|
else
|
|
s_spanletvars.spancount = count;
|
|
|
|
count -= s_spanletvars.spancount;
|
|
|
|
if (count)
|
|
{
|
|
// calculate s/z, t/z, zi->fixed s and t at far end of span,
|
|
// calculate s and t steps across span by shifting
|
|
sdivz += sdivzspanletstepu;
|
|
tdivz += tdivzspanletstepu;
|
|
zi += zispanletstepu;
|
|
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
|
|
|
snext = (int)(sdivz * z) + sadjust;
|
|
tnext = (int)(tdivz * z) + tadjust;
|
|
|
|
if ( !iswater )
|
|
{
|
|
if (snext > bbextents)
|
|
snext = bbextents;
|
|
else if (snext < AFFINE_SPANLET_SIZE)
|
|
snext = AFFINE_SPANLET_SIZE; // prevent round-off error on <0 steps from
|
|
// from causing overstepping & running off the
|
|
// edge of the texture
|
|
|
|
if (tnext > bbextentt)
|
|
tnext = bbextentt;
|
|
else if (tnext < AFFINE_SPANLET_SIZE)
|
|
tnext = AFFINE_SPANLET_SIZE; // guard against round-off error on <0 steps
|
|
}
|
|
|
|
s_spanletvars.sstep = (snext - s_spanletvars.s) >> AFFINE_SPANLET_SIZE_BITS;
|
|
s_spanletvars.tstep = (tnext - s_spanletvars.t) >> AFFINE_SPANLET_SIZE_BITS;
|
|
}
|
|
else
|
|
{
|
|
// calculate s/z, t/z, zi->fixed s and t at last pixel in span (so
|
|
// can't step off polygon), clamp, calculate s and t steps across
|
|
// span by division, biasing steps low so we don't run off the
|
|
// texture
|
|
spancountminus1 = (float)(s_spanletvars.spancount - 1);
|
|
sdivz += d_sdivzstepu * spancountminus1;
|
|
tdivz += d_tdivzstepu * spancountminus1;
|
|
zi += d_zistepu * spancountminus1;
|
|
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
|
snext = (int)(sdivz * z) + sadjust;
|
|
tnext = (int)(tdivz * z) + tadjust;
|
|
|
|
if ( !iswater )
|
|
{
|
|
if (snext > bbextents)
|
|
snext = bbextents;
|
|
else if (snext < AFFINE_SPANLET_SIZE)
|
|
snext = AFFINE_SPANLET_SIZE; // prevent round-off error on <0 steps from
|
|
// from causing overstepping & running off the
|
|
// edge of the texture
|
|
|
|
if (tnext > bbextentt)
|
|
tnext = bbextentt;
|
|
else if (tnext < AFFINE_SPANLET_SIZE)
|
|
tnext = AFFINE_SPANLET_SIZE; // guard against round-off error on <0 steps
|
|
}
|
|
|
|
if (s_spanletvars.spancount > 1)
|
|
{
|
|
s_spanletvars.sstep = (snext - s_spanletvars.s) / (s_spanletvars.spancount - 1);
|
|
s_spanletvars.tstep = (tnext - s_spanletvars.t) / (s_spanletvars.spancount - 1);
|
|
}
|
|
}
|
|
|
|
if ( iswater )
|
|
{
|
|
s_spanletvars.s = s_spanletvars.s & ((CYCLE<<16)-1);
|
|
s_spanletvars.t = s_spanletvars.t & ((CYCLE<<16)-1);
|
|
}
|
|
|
|
r_polydesc.drawspanlet();
|
|
|
|
s_spanletvars.s = snext;
|
|
s_spanletvars.t = tnext;
|
|
|
|
} while (count > 0);
|
|
|
|
NextSpan:
|
|
pspan++;
|
|
|
|
} while (pspan->count != DS_SPAN_LIST_END);
|
|
}
|
|
|
|
/*
|
|
**
|
|
** R_PolygonScanLeftEdge
|
|
**
|
|
** Goes through the polygon and scans the left edge, filling in
|
|
** screen coordinate data for the spans
|
|
*/
|
|
void R_PolygonScanLeftEdge (void)
|
|
{
|
|
int i, v, itop, ibottom, lmaxindex;
|
|
emitpoint_t *pvert, *pnext;
|
|
espan_t *pspan;
|
|
float du, dv, vtop, vbottom, slope;
|
|
fixed16_t u, u_step;
|
|
|
|
pspan = s_polygon_spans;
|
|
i = s_minindex;
|
|
if (i == 0)
|
|
i = r_polydesc.nump;
|
|
|
|
lmaxindex = s_maxindex;
|
|
if (lmaxindex == 0)
|
|
lmaxindex = r_polydesc.nump;
|
|
|
|
vtop = ceil (r_polydesc.pverts[i].v);
|
|
|
|
do
|
|
{
|
|
pvert = &r_polydesc.pverts[i];
|
|
pnext = pvert - 1;
|
|
|
|
vbottom = ceil (pnext->v);
|
|
|
|
if (vtop < vbottom)
|
|
{
|
|
du = pnext->u - pvert->u;
|
|
dv = pnext->v - pvert->v;
|
|
|
|
slope = du / dv;
|
|
u_step = (int)(slope * 0x10000);
|
|
// adjust u to ceil the integer portion
|
|
u = (int)((pvert->u + (slope * (vtop - pvert->v))) * 0x10000) +
|
|
(0x10000 - 1);
|
|
itop = (int)vtop;
|
|
ibottom = (int)vbottom;
|
|
|
|
for (v=itop ; v<ibottom ; v++)
|
|
{
|
|
pspan->u = u >> 16;
|
|
pspan->v = v;
|
|
u += u_step;
|
|
pspan++;
|
|
}
|
|
}
|
|
|
|
vtop = vbottom;
|
|
|
|
i--;
|
|
if (i == 0)
|
|
i = r_polydesc.nump;
|
|
|
|
} while (i != lmaxindex);
|
|
}
|
|
|
|
/*
|
|
** R_PolygonScanRightEdge
|
|
**
|
|
** Goes through the polygon and scans the right edge, filling in
|
|
** count values.
|
|
*/
|
|
void R_PolygonScanRightEdge (void)
|
|
{
|
|
int i, v, itop, ibottom;
|
|
emitpoint_t *pvert, *pnext;
|
|
espan_t *pspan;
|
|
float du, dv, vtop, vbottom, slope, uvert, unext, vvert, vnext;
|
|
fixed16_t u, u_step;
|
|
|
|
pspan = s_polygon_spans;
|
|
i = s_minindex;
|
|
|
|
vvert = r_polydesc.pverts[i].v;
|
|
if (vvert < r_refdef.fvrecty_adj)
|
|
vvert = r_refdef.fvrecty_adj;
|
|
if (vvert > r_refdef.fvrectbottom_adj)
|
|
vvert = r_refdef.fvrectbottom_adj;
|
|
|
|
vtop = ceil (vvert);
|
|
|
|
do
|
|
{
|
|
pvert = &r_polydesc.pverts[i];
|
|
pnext = pvert + 1;
|
|
|
|
vnext = pnext->v;
|
|
if (vnext < r_refdef.fvrecty_adj)
|
|
vnext = r_refdef.fvrecty_adj;
|
|
if (vnext > r_refdef.fvrectbottom_adj)
|
|
vnext = r_refdef.fvrectbottom_adj;
|
|
|
|
vbottom = ceil (vnext);
|
|
|
|
if (vtop < vbottom)
|
|
{
|
|
uvert = pvert->u;
|
|
if (uvert < r_refdef.fvrectx_adj)
|
|
uvert = r_refdef.fvrectx_adj;
|
|
if (uvert > r_refdef.fvrectright_adj)
|
|
uvert = r_refdef.fvrectright_adj;
|
|
|
|
unext = pnext->u;
|
|
if (unext < r_refdef.fvrectx_adj)
|
|
unext = r_refdef.fvrectx_adj;
|
|
if (unext > r_refdef.fvrectright_adj)
|
|
unext = r_refdef.fvrectright_adj;
|
|
|
|
du = unext - uvert;
|
|
dv = vnext - vvert;
|
|
slope = du / dv;
|
|
u_step = (int)(slope * 0x10000);
|
|
// adjust u to ceil the integer portion
|
|
u = (int)((uvert + (slope * (vtop - vvert))) * 0x10000) +
|
|
(0x10000 - 1);
|
|
itop = (int)vtop;
|
|
ibottom = (int)vbottom;
|
|
|
|
for (v=itop ; v<ibottom ; v++)
|
|
{
|
|
pspan->count = (u >> 16) - pspan->u;
|
|
u += u_step;
|
|
pspan++;
|
|
}
|
|
}
|
|
|
|
vtop = vbottom;
|
|
vvert = vnext;
|
|
|
|
i++;
|
|
if (i == r_polydesc.nump)
|
|
i = 0;
|
|
|
|
} while (i != s_maxindex);
|
|
|
|
pspan->count = DS_SPAN_LIST_END; // mark the end of the span list
|
|
}
|
|
|
|
/*
|
|
** R_ClipAndDrawPoly
|
|
*/
|
|
// PGM - isturbulent was qboolean. changed to int to allow passing more flags
|
|
void R_ClipAndDrawPoly ( float alpha, int isturbulent, qboolean textured )
|
|
{
|
|
emitpoint_t outverts[MAXWORKINGVERTS+3], *pout;
|
|
float *pv;
|
|
int i, nump;
|
|
float scale;
|
|
vec3_t transformed, local;
|
|
|
|
if ( !textured )
|
|
{
|
|
r_polydesc.drawspanlet = R_DrawSpanletConstant33;
|
|
}
|
|
else
|
|
{
|
|
|
|
/*
|
|
** choose the correct spanlet routine based on alpha
|
|
*/
|
|
if ( alpha == 1 )
|
|
{
|
|
// isturbulent is ignored because we know that turbulent surfaces
|
|
// can't be opaque
|
|
r_polydesc.drawspanlet = R_DrawSpanletOpaque;
|
|
}
|
|
else
|
|
{
|
|
if ( sw_stipplealpha->value )
|
|
{
|
|
if ( isturbulent )
|
|
{
|
|
if ( alpha > 0.33 )
|
|
r_polydesc.drawspanlet = R_DrawSpanletTurbulentStipple66;
|
|
else
|
|
r_polydesc.drawspanlet = R_DrawSpanletTurbulentStipple33;
|
|
}
|
|
else
|
|
{
|
|
if ( alpha > 0.33 )
|
|
r_polydesc.drawspanlet = R_DrawSpanlet66Stipple;
|
|
else
|
|
r_polydesc.drawspanlet = R_DrawSpanlet33Stipple;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if ( isturbulent )
|
|
{
|
|
if ( alpha > 0.33 )
|
|
r_polydesc.drawspanlet = R_DrawSpanletTurbulentBlended66;
|
|
else
|
|
r_polydesc.drawspanlet = R_DrawSpanletTurbulentBlended33;
|
|
}
|
|
else
|
|
{
|
|
if ( alpha > 0.33 )
|
|
r_polydesc.drawspanlet = R_DrawSpanlet66;
|
|
else
|
|
r_polydesc.drawspanlet = R_DrawSpanlet33;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// clip to the frustum in worldspace
|
|
nump = r_polydesc.nump;
|
|
clip_current = 0;
|
|
|
|
for (i=0 ; i<4 ; i++)
|
|
{
|
|
nump = R_ClipPolyFace (nump, &view_clipplanes[i]);
|
|
if (nump < 3)
|
|
return;
|
|
if (nump > MAXWORKINGVERTS)
|
|
ri.Sys_Error(ERR_DROP, "R_ClipAndDrawPoly: too many points: %d", nump );
|
|
}
|
|
|
|
// transform vertices into viewspace and project
|
|
pv = &r_clip_verts[clip_current][0][0];
|
|
|
|
for (i=0 ; i<nump ; i++)
|
|
{
|
|
VectorSubtract (pv, r_origin, local);
|
|
TransformVector (local, transformed);
|
|
|
|
if (transformed[2] < NEAR_CLIP)
|
|
transformed[2] = NEAR_CLIP;
|
|
|
|
pout = &outverts[i];
|
|
pout->zi = 1.0 / transformed[2];
|
|
|
|
pout->s = pv[3];
|
|
pout->t = pv[4];
|
|
|
|
scale = xscale * pout->zi;
|
|
pout->u = (xcenter + scale * transformed[0]);
|
|
|
|
scale = yscale * pout->zi;
|
|
pout->v = (ycenter - scale * transformed[1]);
|
|
|
|
pv += sizeof (vec5_t) / sizeof (pv);
|
|
}
|
|
|
|
// draw it
|
|
r_polydesc.nump = nump;
|
|
r_polydesc.pverts = outverts;
|
|
|
|
R_DrawPoly( isturbulent );
|
|
}
|
|
|
|
/*
|
|
** R_BuildPolygonFromSurface
|
|
*/
|
|
void R_BuildPolygonFromSurface(msurface_t *fa)
|
|
{
|
|
int i, lindex, lnumverts;
|
|
medge_t *pedges, *r_pedge;
|
|
int vertpage;
|
|
float *vec;
|
|
vec5_t *pverts;
|
|
float tmins[2] = { 0, 0 };
|
|
|
|
r_polydesc.nump = 0;
|
|
|
|
// reconstruct the polygon
|
|
pedges = currentmodel->edges;
|
|
lnumverts = fa->numedges;
|
|
vertpage = 0;
|
|
|
|
pverts = r_clip_verts[0];
|
|
|
|
for (i=0 ; i<lnumverts ; i++)
|
|
{
|
|
lindex = currentmodel->surfedges[fa->firstedge + i];
|
|
|
|
if (lindex > 0)
|
|
{
|
|
r_pedge = &pedges[lindex];
|
|
vec = currentmodel->vertexes[r_pedge->v[0]].position;
|
|
}
|
|
else
|
|
{
|
|
r_pedge = &pedges[-lindex];
|
|
vec = currentmodel->vertexes[r_pedge->v[1]].position;
|
|
}
|
|
|
|
VectorCopy (vec, pverts[i] );
|
|
}
|
|
|
|
VectorCopy( fa->texinfo->vecs[0], r_polydesc.vright );
|
|
VectorCopy( fa->texinfo->vecs[1], r_polydesc.vup );
|
|
VectorCopy( fa->plane->normal, r_polydesc.vpn );
|
|
VectorCopy( r_origin, r_polydesc.viewer_position );
|
|
|
|
if ( fa->flags & SURF_PLANEBACK )
|
|
{
|
|
VectorSubtract( vec3_origin, r_polydesc.vpn, r_polydesc.vpn );
|
|
}
|
|
|
|
// PGM 09/16/98
|
|
if ( fa->texinfo->flags & (SURF_WARP|SURF_FLOWING) )
|
|
{
|
|
r_polydesc.pixels = fa->texinfo->image->pixels[0];
|
|
r_polydesc.pixel_width = fa->texinfo->image->width;
|
|
r_polydesc.pixel_height = fa->texinfo->image->height;
|
|
}
|
|
// PGM 09/16/98
|
|
else
|
|
{
|
|
surfcache_t *scache;
|
|
|
|
scache = D_CacheSurface( fa, 0 );
|
|
|
|
r_polydesc.pixels = scache->data;
|
|
r_polydesc.pixel_width = scache->width;
|
|
r_polydesc.pixel_height = scache->height;
|
|
|
|
tmins[0] = fa->texturemins[0];
|
|
tmins[1] = fa->texturemins[1];
|
|
}
|
|
|
|
r_polydesc.dist = DotProduct( r_polydesc.vpn, pverts[0] );
|
|
|
|
r_polydesc.s_offset = fa->texinfo->vecs[0][3] - tmins[0];
|
|
r_polydesc.t_offset = fa->texinfo->vecs[1][3] - tmins[1];
|
|
|
|
// scrolling texture addition
|
|
if (fa->texinfo->flags & SURF_FLOWING)
|
|
{
|
|
r_polydesc.s_offset += -128 * ( (r_newrefdef.time*0.25) - (int)(r_newrefdef.time*0.25) );
|
|
}
|
|
|
|
r_polydesc.nump = lnumverts;
|
|
}
|
|
|
|
/*
|
|
** R_PolygonCalculateGradients
|
|
*/
|
|
void R_PolygonCalculateGradients (void)
|
|
{
|
|
vec3_t p_normal, p_saxis, p_taxis;
|
|
float distinv;
|
|
|
|
TransformVector (r_polydesc.vpn, p_normal);
|
|
TransformVector (r_polydesc.vright, p_saxis);
|
|
TransformVector (r_polydesc.vup, p_taxis);
|
|
|
|
distinv = 1.0 / (-(DotProduct (r_polydesc.viewer_position, r_polydesc.vpn)) + r_polydesc.dist );
|
|
|
|
d_sdivzstepu = p_saxis[0] * xscaleinv;
|
|
d_sdivzstepv = -p_saxis[1] * yscaleinv;
|
|
d_sdivzorigin = p_saxis[2] - xcenter * d_sdivzstepu - ycenter * d_sdivzstepv;
|
|
|
|
d_tdivzstepu = p_taxis[0] * xscaleinv;
|
|
d_tdivzstepv = -p_taxis[1] * yscaleinv;
|
|
d_tdivzorigin = p_taxis[2] - xcenter * d_tdivzstepu - ycenter * d_tdivzstepv;
|
|
|
|
d_zistepu = p_normal[0] * xscaleinv * distinv;
|
|
d_zistepv = -p_normal[1] * yscaleinv * distinv;
|
|
d_ziorigin = p_normal[2] * distinv - xcenter * d_zistepu - ycenter * d_zistepv;
|
|
|
|
sadjust = (fixed16_t) ( ( DotProduct( r_polydesc.viewer_position, r_polydesc.vright) + r_polydesc.s_offset ) * 0x10000 );
|
|
tadjust = (fixed16_t) ( ( DotProduct( r_polydesc.viewer_position, r_polydesc.vup ) + r_polydesc.t_offset ) * 0x10000 );
|
|
|
|
// -1 (-epsilon) so we never wander off the edge of the texture
|
|
bbextents = (r_polydesc.pixel_width << 16) - 1;
|
|
bbextentt = (r_polydesc.pixel_height << 16) - 1;
|
|
}
|
|
|
|
/*
|
|
** R_DrawPoly
|
|
**
|
|
** Polygon drawing function. Uses the polygon described in r_polydesc
|
|
** to calculate edges and gradients, then renders the resultant spans.
|
|
**
|
|
** This should NOT be called externally since it doesn't do clipping!
|
|
*/
|
|
// PGM - iswater was qboolean. changed to support passing more flags
|
|
static void R_DrawPoly( int iswater )
|
|
{
|
|
int i, nump;
|
|
float ymin, ymax;
|
|
emitpoint_t *pverts;
|
|
espan_t spans[MAXHEIGHT+1];
|
|
|
|
s_polygon_spans = spans;
|
|
|
|
// find the top and bottom vertices, and make sure there's at least one scan to
|
|
// draw
|
|
ymin = 999999.9;
|
|
ymax = -999999.9;
|
|
pverts = r_polydesc.pverts;
|
|
|
|
for (i=0 ; i<r_polydesc.nump ; i++)
|
|
{
|
|
if (pverts->v < ymin)
|
|
{
|
|
ymin = pverts->v;
|
|
s_minindex = i;
|
|
}
|
|
|
|
if (pverts->v > ymax)
|
|
{
|
|
ymax = pverts->v;
|
|
s_maxindex = i;
|
|
}
|
|
|
|
pverts++;
|
|
}
|
|
|
|
ymin = ceil (ymin);
|
|
ymax = ceil (ymax);
|
|
|
|
if (ymin >= ymax)
|
|
return; // doesn't cross any scans at all
|
|
|
|
cachewidth = r_polydesc.pixel_width;
|
|
cacheblock = r_polydesc.pixels;
|
|
|
|
// copy the first vertex to the last vertex, so we don't have to deal with
|
|
// wrapping
|
|
nump = r_polydesc.nump;
|
|
pverts = r_polydesc.pverts;
|
|
pverts[nump] = pverts[0];
|
|
|
|
R_PolygonCalculateGradients ();
|
|
R_PolygonScanLeftEdge ();
|
|
R_PolygonScanRightEdge ();
|
|
|
|
R_PolygonDrawSpans( s_polygon_spans, iswater );
|
|
}
|
|
|
|
/*
|
|
** R_DrawAlphaSurfaces
|
|
*/
|
|
void R_DrawAlphaSurfaces( void )
|
|
{
|
|
msurface_t *s = r_alpha_surfaces;
|
|
|
|
currentmodel = r_worldmodel;
|
|
|
|
modelorg[0] = -r_origin[0];
|
|
modelorg[1] = -r_origin[1];
|
|
modelorg[2] = -r_origin[2];
|
|
|
|
while ( s )
|
|
{
|
|
R_BuildPolygonFromSurface( s );
|
|
|
|
//=======
|
|
//PGM
|
|
// if (s->texinfo->flags & SURF_TRANS66)
|
|
// R_ClipAndDrawPoly( 0.60f, ( s->texinfo->flags & SURF_WARP) != 0, true );
|
|
// else
|
|
// R_ClipAndDrawPoly( 0.30f, ( s->texinfo->flags & SURF_WARP) != 0, true );
|
|
|
|
// PGM - pass down all the texinfo flags, not just SURF_WARP.
|
|
if (s->texinfo->flags & SURF_TRANS66)
|
|
R_ClipAndDrawPoly( 0.60f, (s->texinfo->flags & (SURF_WARP|SURF_FLOWING)), true );
|
|
else
|
|
R_ClipAndDrawPoly( 0.30f, (s->texinfo->flags & (SURF_WARP|SURF_FLOWING)), true );
|
|
//PGM
|
|
//=======
|
|
|
|
s = s->nextalphasurface;
|
|
}
|
|
|
|
r_alpha_surfaces = NULL;
|
|
}
|
|
|
|
/*
|
|
** R_IMFlatShadedQuad
|
|
*/
|
|
void R_IMFlatShadedQuad( vec3_t a, vec3_t b, vec3_t c, vec3_t d, int color, float alpha )
|
|
{
|
|
vec3_t s0, s1;
|
|
|
|
r_polydesc.nump = 4;
|
|
VectorCopy( r_origin, r_polydesc.viewer_position );
|
|
|
|
VectorCopy( a, r_clip_verts[0][0] );
|
|
VectorCopy( b, r_clip_verts[0][1] );
|
|
VectorCopy( c, r_clip_verts[0][2] );
|
|
VectorCopy( d, r_clip_verts[0][3] );
|
|
|
|
r_clip_verts[0][0][3] = 0;
|
|
r_clip_verts[0][1][3] = 0;
|
|
r_clip_verts[0][2][3] = 0;
|
|
r_clip_verts[0][3][3] = 0;
|
|
|
|
r_clip_verts[0][0][4] = 0;
|
|
r_clip_verts[0][1][4] = 0;
|
|
r_clip_verts[0][2][4] = 0;
|
|
r_clip_verts[0][3][4] = 0;
|
|
|
|
VectorSubtract( d, c, s0 );
|
|
VectorSubtract( c, b, s1 );
|
|
CrossProduct( s0, s1, r_polydesc.vpn );
|
|
VectorNormalize( r_polydesc.vpn );
|
|
|
|
r_polydesc.dist = DotProduct( r_polydesc.vpn, r_clip_verts[0][0] );
|
|
|
|
r_polyblendcolor = color;
|
|
|
|
R_ClipAndDrawPoly( alpha, false, false );
|
|
}
|
|
|