mirror of https://github.com/FWGS/xash3d-fwgs
1421 lines
33 KiB
C
1421 lines
33 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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// d_scan.c
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//
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// Portable C scan-level rasterization code, all pixel depths.
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#include "r_local.h"
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pixel_t *r_turb_pbase, *r_turb_pdest;
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short *r_turb_pz;
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fixed16_t r_turb_s, r_turb_t, r_turb_sstep, r_turb_tstep;
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int r_turb_izistep, r_turb_izi;
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int *r_turb_turb;
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static int r_turb_spancount;
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int alpha;
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void D_DrawTurbulent8Span (void);
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/*
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=============
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D_WarpScreen
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this performs a slight compression of the screen at the same time as
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the sine warp, to keep the edges from wrapping
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=============
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*/
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void D_WarpScreen (void)
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{
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#if 0
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int w, h;
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int u,v, u2, v2;
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byte *dest;
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int *turb;
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int *col;
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byte **row;
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static int cached_width, cached_height;
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static byte *rowptr[1200+AMP2*2];
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static int column[1600+AMP2*2];
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//
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// these are constant over resolutions, and can be saved
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//
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w = r_newrefdef.width;
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h = r_newrefdef.height;
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if (w != cached_width || h != cached_height)
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{
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cached_width = w;
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cached_height = h;
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for (v=0 ; v<h+AMP2*2 ; v++)
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{
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v2 = (int)((float)v/(h + AMP2 * 2) * r_refdef.vrect.height);
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rowptr[v] = r_warpbuffer + (WARP_WIDTH * v2);
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}
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for (u=0 ; u<w+AMP2*2 ; u++)
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{
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u2 = (int)((float)u/(w + AMP2 * 2) * r_refdef.vrect.width);
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column[u] = u2;
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}
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}
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turb = intsintable + ((int)(r_newrefdef.time*SPEED)&(CYCLE-1));
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dest = vid.buffer + r_newrefdef.y * vid.rowbytes + r_newrefdef.x;
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for (v=0 ; v<h ; v++, dest += vid.rowbytes)
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{
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col = &column[turb[v]];
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row = &rowptr[v];
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for (u=0 ; u<w ; u+=4)
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{
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dest[u+0] = row[turb[u+0]][col[u+0]];
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dest[u+1] = row[turb[u+1]][col[u+1]];
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dest[u+2] = row[turb[u+2]][col[u+2]];
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dest[u+3] = row[turb[u+3]][col[u+3]];
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}
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}
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#endif
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}
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#if !id386
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/*
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=============
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D_DrawTurbulent8Span
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=============
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*/
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void D_DrawTurbulent8Span (void)
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{
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int sturb, tturb;
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do
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{
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sturb = ((r_turb_s + r_turb_turb[(r_turb_t>>16)&(CYCLE-1)])>>16)&63;
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tturb = ((r_turb_t + r_turb_turb[(r_turb_s>>16)&(CYCLE-1)])>>16)&63;
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*r_turb_pdest++ = *(r_turb_pbase + (tturb<<6) + sturb);
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r_turb_s += r_turb_sstep;
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r_turb_t += r_turb_tstep;
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} while (--r_turb_spancount > 0);
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}
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/*
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=============
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D_DrawTurbulent8Span
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=============
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*/
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void D_DrawTurbulent8ZSpan (void)
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{
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int sturb, tturb;
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do
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{
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sturb = ((r_turb_s + r_turb_turb[(r_turb_t>>16)&(CYCLE-1)])>>16)&63;
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tturb = ((r_turb_t + r_turb_turb[(r_turb_s>>16)&(CYCLE-1)])>>16)&63;
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if (*r_turb_pz <= (r_turb_izi >> 16))
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{
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pixel_t btemp = *(r_turb_pbase + (tturb<<6) + sturb);
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if( alpha == 7 )
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*r_turb_pdest = btemp;
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else
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*r_turb_pdest = BLEND_ALPHA( alpha, btemp, *r_turb_pdest);
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}
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r_turb_pdest++;
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r_turb_pz++;
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r_turb_izi += r_turb_izistep;
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r_turb_s += r_turb_sstep;
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r_turb_t += r_turb_tstep;
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} while (--r_turb_spancount > 0);
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}
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#endif // !id386
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/*
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=============
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Turbulent8
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=============
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*/
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void Turbulent8 (espan_t *pspan)
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{
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int count;
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fixed16_t snext, tnext;
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float sdivz, tdivz, zi, z, du, dv, spancountminus1;
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float sdivz16stepu, tdivz16stepu, zi16stepu;
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r_turb_turb = sintable + ((int)(gpGlobals->time*SPEED)&(CYCLE-1));
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r_turb_sstep = 0; // keep compiler happy
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r_turb_tstep = 0; // ditto
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r_turb_pbase = cacheblock;
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sdivz16stepu = d_sdivzstepu * 16;
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tdivz16stepu = d_tdivzstepu * 16;
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zi16stepu = d_zistepu * 16;
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do
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{
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r_turb_pdest = (d_viewbuffer +
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(r_screenwidth * pspan->v) + pspan->u);
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count = pspan->count;
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// calculate the initial s/z, t/z, 1/z, s, and t and clamp
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du = (float)pspan->u;
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dv = (float)pspan->v;
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sdivz = d_sdivzorigin + dv*d_sdivzstepv + du*d_sdivzstepu;
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tdivz = d_tdivzorigin + dv*d_tdivzstepv + du*d_tdivzstepu;
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zi = d_ziorigin + dv*d_zistepv + du*d_zistepu;
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z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
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r_turb_s = (int)(sdivz * z) + sadjust;
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if (r_turb_s > bbextents)
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r_turb_s = bbextents;
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else if (r_turb_s < 0)
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r_turb_s = 0;
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r_turb_t = (int)(tdivz * z) + tadjust;
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if (r_turb_t > bbextentt)
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r_turb_t = bbextentt;
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else if (r_turb_t < 0)
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r_turb_t = 0;
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do
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{
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// calculate s and t at the far end of the span
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if (count >= 16)
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r_turb_spancount = 16;
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else
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r_turb_spancount = count;
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count -= r_turb_spancount;
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if (count)
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{
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// calculate s/z, t/z, zi->fixed s and t at far end of span,
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// calculate s and t steps across span by shifting
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sdivz += sdivz16stepu;
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tdivz += tdivz16stepu;
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zi += zi16stepu;
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z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
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snext = (int)(sdivz * z) + sadjust;
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if (snext > bbextents)
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snext = bbextents;
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else if (snext < 16)
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snext = 16; // prevent round-off error on <0 steps from
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// from causing overstepping & running off the
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// edge of the texture
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tnext = (int)(tdivz * z) + tadjust;
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if (tnext > bbextentt)
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tnext = bbextentt;
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else if (tnext < 16)
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tnext = 16; // guard against round-off error on <0 steps
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r_turb_sstep = (snext - r_turb_s) >> 4;
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r_turb_tstep = (tnext - r_turb_t) >> 4;
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}
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else
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{
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// calculate s/z, t/z, zi->fixed s and t at last pixel in span (so
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// can't step off polygon), clamp, calculate s and t steps across
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// span by division, biasing steps low so we don't run off the
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// texture
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spancountminus1 = (float)(r_turb_spancount - 1);
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sdivz += d_sdivzstepu * spancountminus1;
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tdivz += d_tdivzstepu * spancountminus1;
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zi += d_zistepu * spancountminus1;
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z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
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snext = (int)(sdivz * z) + sadjust;
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if (snext > bbextents)
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snext = bbextents;
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else if (snext < 16)
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snext = 16; // prevent round-off error on <0 steps from
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// from causing overstepping & running off the
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// edge of the texture
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tnext = (int)(tdivz * z) + tadjust;
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if (tnext > bbextentt)
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tnext = bbextentt;
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else if (tnext < 16)
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tnext = 16; // guard against round-off error on <0 steps
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if (r_turb_spancount > 1)
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{
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r_turb_sstep = (snext - r_turb_s) / (r_turb_spancount - 1);
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r_turb_tstep = (tnext - r_turb_t) / (r_turb_spancount - 1);
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}
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}
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r_turb_s = r_turb_s & ((CYCLE<<16)-1);
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r_turb_t = r_turb_t & ((CYCLE<<16)-1);
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D_DrawTurbulent8Span ();
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r_turb_s = snext;
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r_turb_t = tnext;
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} while (count > 0);
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} while ((pspan = pspan->pnext) != NULL);
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}
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/*
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=============
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Turbulent8
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=============
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*/
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void TurbulentZ8 (espan_t *pspan, int alpha1)
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{
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int count;
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fixed16_t snext, tnext;
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float sdivz, tdivz, zi, z, du, dv, spancountminus1;
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float sdivz16stepu, tdivz16stepu, zi16stepu;
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alpha = alpha1;
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if( alpha > 7 )
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alpha = 7;
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if( alpha == 0 )
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return;
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r_turb_turb = sintable + ((int)(gpGlobals->time*SPEED)&(CYCLE-1));
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r_turb_sstep = 0; // keep compiler happy
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r_turb_tstep = 0; // ditto
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r_turb_pbase = cacheblock;
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sdivz16stepu = d_sdivzstepu * 16;
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tdivz16stepu = d_tdivzstepu * 16;
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zi16stepu = d_zistepu * 16;
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r_turb_izistep = (int)(d_zistepu * 0x8000 * 0x10000);
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do
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{
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r_turb_pdest = (d_viewbuffer +
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(r_screenwidth * pspan->v) + pspan->u);
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r_turb_pz = d_pzbuffer + (d_zwidth * pspan->v) + pspan->u;
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count = pspan->count;
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// calculate the initial s/z, t/z, 1/z, s, and t and clamp
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du = (float)pspan->u;
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dv = (float)pspan->v;
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sdivz = d_sdivzorigin + dv*d_sdivzstepv + du*d_sdivzstepu;
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tdivz = d_tdivzorigin + dv*d_tdivzstepv + du*d_tdivzstepu;
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zi = d_ziorigin + dv*d_zistepv + du*d_zistepu;
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z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
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r_turb_izi = (int)(zi * 0x8000 * 0x10000);
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r_turb_s = (int)(sdivz * z) + sadjust;
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if (r_turb_s > bbextents)
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r_turb_s = bbextents;
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else if (r_turb_s < 0)
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r_turb_s = 0;
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r_turb_t = (int)(tdivz * z) + tadjust;
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if (r_turb_t > bbextentt)
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r_turb_t = bbextentt;
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else if (r_turb_t < 0)
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r_turb_t = 0;
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do
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{
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// calculate s and t at the far end of the span
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if (count >= 16)
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r_turb_spancount = 16;
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else
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r_turb_spancount = count;
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count -= r_turb_spancount;
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if (count)
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{
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// calculate s/z, t/z, zi->fixed s and t at far end of span,
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// calculate s and t steps across span by shifting
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sdivz += sdivz16stepu;
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tdivz += tdivz16stepu;
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zi += zi16stepu;
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z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
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snext = (int)(sdivz * z) + sadjust;
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if (snext > bbextents)
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snext = bbextents;
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else if (snext < 16)
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snext = 16; // prevent round-off error on <0 steps from
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// from causing overstepping & running off the
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// edge of the texture
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tnext = (int)(tdivz * z) + tadjust;
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if (tnext > bbextentt)
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tnext = bbextentt;
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else if (tnext < 16)
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tnext = 16; // guard against round-off error on <0 steps
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r_turb_sstep = (snext - r_turb_s) >> 4;
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r_turb_tstep = (tnext - r_turb_t) >> 4;
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}
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else
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{
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// calculate s/z, t/z, zi->fixed s and t at last pixel in span (so
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// can't step off polygon), clamp, calculate s and t steps across
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// span by division, biasing steps low so we don't run off the
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// texture
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spancountminus1 = (float)(r_turb_spancount - 1);
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sdivz += d_sdivzstepu * spancountminus1;
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tdivz += d_tdivzstepu * spancountminus1;
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zi += d_zistepu * spancountminus1;
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z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
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snext = (int)(sdivz * z) + sadjust;
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if (snext > bbextents)
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snext = bbextents;
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else if (snext < 16)
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snext = 16; // prevent round-off error on <0 steps from
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// from causing overstepping & running off the
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// edge of the texture
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tnext = (int)(tdivz * z) + tadjust;
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if (tnext > bbextentt)
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tnext = bbextentt;
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else if (tnext < 16)
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tnext = 16; // guard against round-off error on <0 steps
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if (r_turb_spancount > 1)
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{
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r_turb_sstep = (snext - r_turb_s) / (r_turb_spancount - 1);
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r_turb_tstep = (tnext - r_turb_t) / (r_turb_spancount - 1);
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}
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}
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r_turb_s = r_turb_s & ((CYCLE<<16)-1);
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r_turb_t = r_turb_t & ((CYCLE<<16)-1);
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D_DrawTurbulent8ZSpan ();
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r_turb_s = snext;
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r_turb_t = tnext;
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} while (count > 0);
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} while ((pspan = pspan->pnext) != NULL);
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}
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//====================
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//PGM
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/*
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=============
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NonTurbulent8 - this is for drawing scrolling textures. they're warping water textures
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but the turbulence is automatically 0.
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=============
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*/
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void NonTurbulent8 (espan_t *pspan)
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{
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int count;
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fixed16_t snext, tnext;
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float sdivz, tdivz, zi, z, du, dv, spancountminus1;
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float sdivz16stepu, tdivz16stepu, zi16stepu;
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// r_turb_turb = sintable + ((int)(r_newrefdef.time*SPEED)&(CYCLE-1));
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r_turb_turb = blanktable;
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r_turb_sstep = 0; // keep compiler happy
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r_turb_tstep = 0; // ditto
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r_turb_pbase = cacheblock;
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sdivz16stepu = d_sdivzstepu * 16;
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tdivz16stepu = d_tdivzstepu * 16;
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zi16stepu = d_zistepu * 16;
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do
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{
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r_turb_pdest = (d_viewbuffer +
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(r_screenwidth * pspan->v) + pspan->u);
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count = pspan->count;
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// calculate the initial s/z, t/z, 1/z, s, and t and clamp
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du = (float)pspan->u;
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dv = (float)pspan->v;
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sdivz = d_sdivzorigin + dv*d_sdivzstepv + du*d_sdivzstepu;
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tdivz = d_tdivzorigin + dv*d_tdivzstepv + du*d_tdivzstepu;
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zi = d_ziorigin + dv*d_zistepv + du*d_zistepu;
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z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
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r_turb_s = (int)(sdivz * z) + sadjust;
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if (r_turb_s > bbextents)
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r_turb_s = bbextents;
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|
else if (r_turb_s < 0)
|
|
r_turb_s = 0;
|
|
|
|
r_turb_t = (int)(tdivz * z) + tadjust;
|
|
if (r_turb_t > bbextentt)
|
|
r_turb_t = bbextentt;
|
|
else if (r_turb_t < 0)
|
|
r_turb_t = 0;
|
|
|
|
do
|
|
{
|
|
// calculate s and t at the far end of the span
|
|
if (count >= 16)
|
|
r_turb_spancount = 16;
|
|
else
|
|
r_turb_spancount = count;
|
|
|
|
count -= r_turb_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 += sdivz16stepu;
|
|
tdivz += tdivz16stepu;
|
|
zi += zi16stepu;
|
|
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
|
|
|
snext = (int)(sdivz * z) + sadjust;
|
|
if (snext > bbextents)
|
|
snext = bbextents;
|
|
else if (snext < 16)
|
|
snext = 16; // prevent round-off error on <0 steps from
|
|
// from causing overstepping & running off the
|
|
// edge of the texture
|
|
|
|
tnext = (int)(tdivz * z) + tadjust;
|
|
if (tnext > bbextentt)
|
|
tnext = bbextentt;
|
|
else if (tnext < 16)
|
|
tnext = 16; // guard against round-off error on <0 steps
|
|
|
|
r_turb_sstep = (snext - r_turb_s) >> 4;
|
|
r_turb_tstep = (tnext - r_turb_t) >> 4;
|
|
}
|
|
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)(r_turb_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;
|
|
if (snext > bbextents)
|
|
snext = bbextents;
|
|
else if (snext < 16)
|
|
snext = 16; // prevent round-off error on <0 steps from
|
|
// from causing overstepping & running off the
|
|
// edge of the texture
|
|
|
|
tnext = (int)(tdivz * z) + tadjust;
|
|
if (tnext > bbextentt)
|
|
tnext = bbextentt;
|
|
else if (tnext < 16)
|
|
tnext = 16; // guard against round-off error on <0 steps
|
|
|
|
if (r_turb_spancount > 1)
|
|
{
|
|
r_turb_sstep = (snext - r_turb_s) / (r_turb_spancount - 1);
|
|
r_turb_tstep = (tnext - r_turb_t) / (r_turb_spancount - 1);
|
|
}
|
|
}
|
|
|
|
r_turb_s = r_turb_s & ((CYCLE<<16)-1);
|
|
r_turb_t = r_turb_t & ((CYCLE<<16)-1);
|
|
|
|
D_DrawTurbulent8Span ();
|
|
|
|
r_turb_s = snext;
|
|
r_turb_t = tnext;
|
|
|
|
} while (count > 0);
|
|
|
|
} while ((pspan = pspan->pnext) != NULL);
|
|
}
|
|
//PGM
|
|
//====================
|
|
|
|
|
|
#if !id386
|
|
|
|
int kernel[2][2][2] =
|
|
{
|
|
{
|
|
{16384,0},
|
|
{49152,32768}
|
|
}
|
|
,
|
|
{
|
|
{32768,49152},
|
|
{0,16384}
|
|
}
|
|
};
|
|
#ifndef DISABLE_TEXFILTER
|
|
#define SW_TEXFILT (sw_texfilt->value == 1.0f)
|
|
#else
|
|
#define SW_TEXFILT 0
|
|
#endif
|
|
/*
|
|
=============
|
|
D_DrawSpans16
|
|
|
|
FIXME: actually make this subdivide by 16 instead of 8!!!
|
|
=============
|
|
*/
|
|
void D_DrawSpans16 (espan_t *pspan)
|
|
{
|
|
int count, spancount;
|
|
pixel_t *pbase, *pdest;
|
|
fixed16_t s, t, snext, tnext, sstep, tstep;
|
|
float sdivz, tdivz, zi, z, du, dv, spancountminus1;
|
|
float sdivz8stepu, tdivz8stepu, zi8stepu;
|
|
|
|
sstep = 0; // keep compiler happy
|
|
tstep = 0; // ditto
|
|
|
|
pbase = cacheblock;
|
|
|
|
sdivz8stepu = d_sdivzstepu * 8;
|
|
tdivz8stepu = d_tdivzstepu * 8;
|
|
zi8stepu = d_zistepu * 8;
|
|
|
|
do
|
|
{
|
|
pdest = (d_viewbuffer +
|
|
(r_screenwidth * pspan->v) + pspan->u);
|
|
|
|
count = pspan->count;
|
|
|
|
// 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
|
|
|
|
s = (int)(sdivz * z) + sadjust;
|
|
if (s > bbextents)
|
|
s = bbextents;
|
|
else if (s < 0)
|
|
s = 0;
|
|
|
|
t = (int)(tdivz * z) + tadjust;
|
|
if (t > bbextentt)
|
|
t = bbextentt;
|
|
else if (t < 0)
|
|
t = 0;
|
|
|
|
do
|
|
{
|
|
// calculate s and t at the far end of the span
|
|
if (count >= 8)
|
|
spancount = 8;
|
|
else
|
|
spancount = count;
|
|
|
|
count -= 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 += sdivz8stepu;
|
|
tdivz += tdivz8stepu;
|
|
zi += zi8stepu;
|
|
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
|
|
|
snext = (int)(sdivz * z) + sadjust;
|
|
if (snext > bbextents)
|
|
snext = bbextents;
|
|
else if (snext < 8)
|
|
snext = 8; // prevent round-off error on <0 steps from
|
|
// from causing overstepping & running off the
|
|
// edge of the texture
|
|
|
|
tnext = (int)(tdivz * z) + tadjust;
|
|
if (tnext > bbextentt)
|
|
tnext = bbextentt;
|
|
else if (tnext < 8)
|
|
tnext = 8; // guard against round-off error on <0 steps
|
|
|
|
sstep = (snext - s) >> 3;
|
|
tstep = (tnext - t) >> 3;
|
|
}
|
|
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)(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;
|
|
if (snext > bbextents)
|
|
snext = bbextents;
|
|
else if (snext < 8)
|
|
snext = 8; // prevent round-off error on <0 steps from
|
|
// from causing overstepping & running off the
|
|
// edge of the texture
|
|
|
|
tnext = (int)(tdivz * z) + tadjust;
|
|
if (tnext > bbextentt)
|
|
tnext = bbextentt;
|
|
else if (tnext < 8)
|
|
tnext = 8; // guard against round-off error on <0 steps
|
|
|
|
if (spancount > 1)
|
|
{
|
|
sstep = (snext - s) / (spancount - 1);
|
|
tstep = (tnext - t) / (spancount - 1);
|
|
}
|
|
}
|
|
|
|
|
|
// Drawing phrase
|
|
if (!SW_TEXFILT)
|
|
{
|
|
do
|
|
{
|
|
*pdest++ = *(pbase + (s >> 16) + (t >> 16) * cachewidth);
|
|
s += sstep;
|
|
t += tstep;
|
|
} while (--spancount > 0);
|
|
}
|
|
else
|
|
{
|
|
do
|
|
{
|
|
int idiths = s;
|
|
int iditht = t;
|
|
|
|
int X = (pspan->u + spancount) & 1;
|
|
int Y = (pspan->v)&1;
|
|
|
|
//Using the kernel
|
|
idiths += kernel[X][Y][0];
|
|
iditht += kernel[X][Y][1];
|
|
|
|
idiths = idiths >> 16;
|
|
idiths = idiths ? idiths -1 : idiths;
|
|
|
|
|
|
iditht = iditht >> 16;
|
|
iditht = iditht ? iditht -1 : iditht;
|
|
|
|
|
|
*pdest++ = *(pbase + idiths + iditht * cachewidth);
|
|
s += sstep;
|
|
t += tstep;
|
|
} while (--spancount > 0);
|
|
}
|
|
|
|
|
|
} while (count > 0);
|
|
|
|
} while ((pspan = pspan->pnext) != NULL);
|
|
}
|
|
|
|
|
|
/*
|
|
=============
|
|
D_DrawSpans16
|
|
|
|
FIXME: actually make this subdivide by 16 instead of 8!!!
|
|
=============
|
|
*/
|
|
void D_AlphaSpans16 (espan_t *pspan)
|
|
{
|
|
int count, spancount;
|
|
pixel_t *pbase, *pdest;
|
|
fixed16_t s, t, snext, tnext, sstep, tstep;
|
|
float sdivz, tdivz, zi, z, du, dv, spancountminus1;
|
|
float sdivz8stepu, tdivz8stepu, zi8stepu;
|
|
int izi, izistep;
|
|
short *pz;
|
|
|
|
sstep = 0; // keep compiler happy
|
|
tstep = 0; // ditto
|
|
|
|
pbase = cacheblock;
|
|
|
|
sdivz8stepu = d_sdivzstepu * 8;
|
|
tdivz8stepu = d_tdivzstepu * 8;
|
|
zi8stepu = d_zistepu * 8;
|
|
izistep = (int)(d_zistepu * 0x8000 * 0x10000);
|
|
|
|
do
|
|
{
|
|
pdest = (d_viewbuffer +
|
|
(r_screenwidth * pspan->v) + pspan->u);
|
|
pz = d_pzbuffer + (d_zwidth * pspan->v) + pspan->u;
|
|
|
|
count = pspan->count;
|
|
|
|
// 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;
|
|
izi = (int)(zi * 0x8000 * 0x10000);
|
|
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
|
|
|
s = (int)(sdivz * z) + sadjust;
|
|
if (s > bbextents)
|
|
s = bbextents;
|
|
else if (s < 0)
|
|
s = 0;
|
|
|
|
t = (int)(tdivz * z) + tadjust;
|
|
if (t > bbextentt)
|
|
t = bbextentt;
|
|
else if (t < 0)
|
|
t = 0;
|
|
|
|
do
|
|
{
|
|
// calculate s and t at the far end of the span
|
|
if (count >= 8)
|
|
spancount = 8;
|
|
else
|
|
spancount = count;
|
|
|
|
count -= 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 += sdivz8stepu;
|
|
tdivz += tdivz8stepu;
|
|
zi += zi8stepu;
|
|
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
|
|
|
snext = (int)(sdivz * z) + sadjust;
|
|
if (snext > bbextents)
|
|
snext = bbextents;
|
|
else if (snext < 8)
|
|
snext = 8; // prevent round-off error on <0 steps from
|
|
// from causing overstepping & running off the
|
|
// edge of the texture
|
|
|
|
tnext = (int)(tdivz * z) + tadjust;
|
|
if (tnext > bbextentt)
|
|
tnext = bbextentt;
|
|
else if (tnext < 8)
|
|
tnext = 8; // guard against round-off error on <0 steps
|
|
|
|
sstep = (snext - s) >> 3;
|
|
tstep = (tnext - t) >> 3;
|
|
}
|
|
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)(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;
|
|
if (snext > bbextents)
|
|
snext = bbextents;
|
|
else if (snext < 8)
|
|
snext = 8; // prevent round-off error on <0 steps from
|
|
// from causing overstepping & running off the
|
|
// edge of the texture
|
|
|
|
tnext = (int)(tdivz * z) + tadjust;
|
|
if (tnext > bbextentt)
|
|
tnext = bbextentt;
|
|
else if (tnext < 8)
|
|
tnext = 8; // guard against round-off error on <0 steps
|
|
|
|
if (spancount > 1)
|
|
{
|
|
sstep = (snext - s) / (spancount - 1);
|
|
tstep = (tnext - t) / (spancount - 1);
|
|
}
|
|
}
|
|
|
|
|
|
// Drawing phrase
|
|
if (!SW_TEXFILT)
|
|
{
|
|
do
|
|
{
|
|
pixel_t btemp;
|
|
|
|
btemp = *(pbase + (s >> 16) + (t >> 16) * cachewidth);
|
|
if (btemp != TRANSPARENT_COLOR)
|
|
{
|
|
if (*pz <= (izi >> 16))
|
|
{
|
|
*pdest = btemp;
|
|
*pz = izi >> 16;
|
|
}
|
|
}
|
|
pdest++;
|
|
pz++;
|
|
izi += izistep;
|
|
s += sstep;
|
|
t += tstep;
|
|
} while (--spancount > 0);
|
|
}
|
|
else
|
|
{
|
|
do
|
|
{
|
|
if (*pz <= (izi >> 16))
|
|
{
|
|
int idiths = s;
|
|
int iditht = t;
|
|
|
|
int X = (pspan->u + spancount) & 1;
|
|
int Y = (pspan->v)&1;
|
|
pixel_t btemp;
|
|
|
|
//Using the kernel
|
|
idiths += kernel[X][Y][0];
|
|
iditht += kernel[X][Y][1];
|
|
|
|
idiths = idiths >> 16;
|
|
idiths = idiths ? idiths -1 : idiths;
|
|
|
|
|
|
iditht = iditht >> 16;
|
|
iditht = iditht ? iditht -1 : iditht;
|
|
|
|
|
|
btemp = *(pbase + idiths + iditht * cachewidth);
|
|
if (btemp != TRANSPARENT_COLOR)
|
|
{
|
|
*pdest = btemp;
|
|
*pz = izi >> 16;
|
|
}
|
|
}
|
|
pdest++;
|
|
pz++;
|
|
s += sstep;
|
|
t += tstep;
|
|
} while (--spancount > 0);
|
|
}
|
|
|
|
|
|
} while (count > 0);
|
|
|
|
} while ((pspan = pspan->pnext) != NULL);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
=============
|
|
D_DrawSpans16
|
|
|
|
FIXME: actually make this subdivide by 16 instead of 8!!!
|
|
=============
|
|
*/
|
|
void D_BlendSpans16 (espan_t *pspan, int alpha)
|
|
{
|
|
int count, spancount;
|
|
pixel_t *pbase, *pdest;
|
|
fixed16_t s, t, snext, tnext, sstep, tstep;
|
|
float sdivz, tdivz, zi, z, du, dv, spancountminus1;
|
|
float sdivz8stepu, tdivz8stepu, zi8stepu;
|
|
int izi, izistep;
|
|
short *pz;
|
|
|
|
if( alpha > 7 )
|
|
alpha = 7;
|
|
if( alpha == 0 )
|
|
return;
|
|
|
|
sstep = 0; // keep compiler happy
|
|
tstep = 0; // ditto
|
|
|
|
pbase = cacheblock;
|
|
|
|
sdivz8stepu = d_sdivzstepu * 8;
|
|
tdivz8stepu = d_tdivzstepu * 8;
|
|
zi8stepu = d_zistepu * 8;
|
|
izistep = (int)(d_zistepu * 0x8000 * 0x10000);
|
|
|
|
do
|
|
{
|
|
pdest = (d_viewbuffer +
|
|
(r_screenwidth * pspan->v) + pspan->u);
|
|
pz = d_pzbuffer + (d_zwidth * pspan->v) + pspan->u;
|
|
|
|
count = pspan->count;
|
|
|
|
// 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;
|
|
izi = (int)(zi * 0x8000 * 0x10000);
|
|
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
|
|
|
s = (int)(sdivz * z) + sadjust;
|
|
if (s > bbextents)
|
|
s = bbextents;
|
|
else if (s < 0)
|
|
s = 0;
|
|
|
|
t = (int)(tdivz * z) + tadjust;
|
|
if (t > bbextentt)
|
|
t = bbextentt;
|
|
else if (t < 0)
|
|
t = 0;
|
|
|
|
do
|
|
{
|
|
// calculate s and t at the far end of the span
|
|
if (count >= 8)
|
|
spancount = 8;
|
|
else
|
|
spancount = count;
|
|
|
|
count -= 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 += sdivz8stepu;
|
|
tdivz += tdivz8stepu;
|
|
zi += zi8stepu;
|
|
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
|
|
|
snext = (int)(sdivz * z) + sadjust;
|
|
if (snext > bbextents)
|
|
snext = bbextents;
|
|
else if (snext < 8)
|
|
snext = 8; // prevent round-off error on <0 steps from
|
|
// from causing overstepping & running off the
|
|
// edge of the texture
|
|
|
|
tnext = (int)(tdivz * z) + tadjust;
|
|
if (tnext > bbextentt)
|
|
tnext = bbextentt;
|
|
else if (tnext < 8)
|
|
tnext = 8; // guard against round-off error on <0 steps
|
|
|
|
sstep = (snext - s) >> 3;
|
|
tstep = (tnext - t) >> 3;
|
|
}
|
|
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)(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;
|
|
if (snext > bbextents)
|
|
snext = bbextents;
|
|
else if (snext < 8)
|
|
snext = 8; // prevent round-off error on <0 steps from
|
|
// from causing overstepping & running off the
|
|
// edge of the texture
|
|
|
|
tnext = (int)(tdivz * z) + tadjust;
|
|
if (tnext > bbextentt)
|
|
tnext = bbextentt;
|
|
else if (tnext < 8)
|
|
tnext = 8; // guard against round-off error on <0 steps
|
|
|
|
if (spancount > 1)
|
|
{
|
|
sstep = (snext - s) / (spancount - 1);
|
|
tstep = (tnext - t) / (spancount - 1);
|
|
}
|
|
}
|
|
|
|
|
|
// Drawing phrase
|
|
if (!SW_TEXFILT)
|
|
{
|
|
do
|
|
{
|
|
if (*pz <= (izi >> 16))
|
|
{
|
|
pixel_t btemp;
|
|
|
|
btemp = *(pbase + (s >> 16) + (t >> 16) * cachewidth);
|
|
|
|
if( btemp != TRANSPARENT_COLOR )
|
|
{
|
|
if( alpha != 7 )
|
|
btemp = BLEND_ALPHA( alpha, btemp, *pdest);
|
|
*pdest = btemp;
|
|
}
|
|
//*pz = izi >> 16;
|
|
}
|
|
pdest++;
|
|
pz++;
|
|
izi += izistep;
|
|
s += sstep;
|
|
t += tstep;
|
|
} while (--spancount > 0);
|
|
}
|
|
else
|
|
{
|
|
do
|
|
{
|
|
int idiths = s;
|
|
int iditht = t;
|
|
|
|
int X = (pspan->u + spancount) & 1;
|
|
int Y = (pspan->v)&1;
|
|
if (*pz <= (izi >> 16))
|
|
{
|
|
pixel_t btemp;
|
|
|
|
//Using the kernel
|
|
idiths += kernel[X][Y][0];
|
|
iditht += kernel[X][Y][1];
|
|
|
|
idiths = idiths >> 16;
|
|
idiths = idiths ? idiths -1 : idiths;
|
|
|
|
|
|
iditht = iditht >> 16;
|
|
iditht = iditht ? iditht -1 : iditht;
|
|
|
|
btemp = *(pbase + idiths + iditht * cachewidth);
|
|
|
|
if( btemp != TRANSPARENT_COLOR )
|
|
{
|
|
if( alpha != 7 )
|
|
btemp = BLEND_ALPHA( alpha, btemp, *pdest);
|
|
*pdest = btemp;
|
|
}
|
|
//*pz = izi >> 16;
|
|
}
|
|
pdest++;
|
|
pz++;
|
|
izi += izistep;
|
|
s += sstep;
|
|
t += tstep;
|
|
} while (--spancount > 0);
|
|
}
|
|
|
|
|
|
} while (count > 0);
|
|
|
|
} while ((pspan = pspan->pnext) != NULL);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
=============
|
|
D_DrawSpans16
|
|
|
|
FIXME: actually make this subdivide by 16 instead of 8!!!
|
|
=============
|
|
*/
|
|
void D_AddSpans16 (espan_t *pspan)
|
|
{
|
|
int count, spancount;
|
|
pixel_t *pbase, *pdest;
|
|
fixed16_t s, t, snext, tnext, sstep, tstep;
|
|
float sdivz, tdivz, zi, z, du, dv, spancountminus1;
|
|
float sdivz8stepu, tdivz8stepu, zi8stepu;
|
|
int izi, izistep;
|
|
short *pz;
|
|
|
|
sstep = 0; // keep compiler happy
|
|
tstep = 0; // ditto
|
|
|
|
pbase = cacheblock;
|
|
|
|
sdivz8stepu = d_sdivzstepu * 8;
|
|
tdivz8stepu = d_tdivzstepu * 8;
|
|
zi8stepu = d_zistepu * 8;
|
|
izistep = (int)(d_zistepu * 0x8000 * 0x10000);
|
|
|
|
do
|
|
{
|
|
pdest = (d_viewbuffer +
|
|
(r_screenwidth * pspan->v) + pspan->u);
|
|
pz = d_pzbuffer + (d_zwidth * pspan->v) + pspan->u;
|
|
|
|
count = pspan->count;
|
|
|
|
// 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;
|
|
izi = (int)(zi * 0x8000 * 0x10000);
|
|
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
|
|
|
s = (int)(sdivz * z) + sadjust;
|
|
if (s > bbextents)
|
|
s = bbextents;
|
|
else if (s < 0)
|
|
s = 0;
|
|
|
|
t = (int)(tdivz * z) + tadjust;
|
|
if (t > bbextentt)
|
|
t = bbextentt;
|
|
else if (t < 0)
|
|
t = 0;
|
|
|
|
do
|
|
{
|
|
// calculate s and t at the far end of the span
|
|
if (count >= 8)
|
|
spancount = 8;
|
|
else
|
|
spancount = count;
|
|
|
|
count -= 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 += sdivz8stepu;
|
|
tdivz += tdivz8stepu;
|
|
zi += zi8stepu;
|
|
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
|
|
|
snext = (int)(sdivz * z) + sadjust;
|
|
if (snext > bbextents)
|
|
snext = bbextents;
|
|
else if (snext < 8)
|
|
snext = 8; // prevent round-off error on <0 steps from
|
|
// from causing overstepping & running off the
|
|
// edge of the texture
|
|
|
|
tnext = (int)(tdivz * z) + tadjust;
|
|
if (tnext > bbextentt)
|
|
tnext = bbextentt;
|
|
else if (tnext < 8)
|
|
tnext = 8; // guard against round-off error on <0 steps
|
|
|
|
sstep = (snext - s) >> 3;
|
|
tstep = (tnext - t) >> 3;
|
|
}
|
|
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)(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;
|
|
if (snext > bbextents)
|
|
snext = bbextents;
|
|
else if (snext < 8)
|
|
snext = 8; // prevent round-off error on <0 steps from
|
|
// from causing overstepping & running off the
|
|
// edge of the texture
|
|
|
|
tnext = (int)(tdivz * z) + tadjust;
|
|
if (tnext > bbextentt)
|
|
tnext = bbextentt;
|
|
else if (tnext < 8)
|
|
tnext = 8; // guard against round-off error on <0 steps
|
|
|
|
if (spancount > 1)
|
|
{
|
|
sstep = (snext - s) / (spancount - 1);
|
|
tstep = (tnext - t) / (spancount - 1);
|
|
}
|
|
}
|
|
|
|
|
|
// Drawing phrase
|
|
if (!SW_TEXFILT)
|
|
{
|
|
do
|
|
{
|
|
if (*pz <= (izi >> 16))
|
|
{
|
|
pixel_t btemp;
|
|
|
|
btemp = *(pbase + (s >> 16) + (t >> 16) * cachewidth);
|
|
|
|
if( btemp != TRANSPARENT_COLOR )
|
|
{
|
|
btemp = BLEND_ADD( btemp, *pdest);
|
|
*pdest = btemp;
|
|
}
|
|
//*pz = izi >> 16;
|
|
}
|
|
pdest++;
|
|
pz++;
|
|
izi += izistep;
|
|
s += sstep;
|
|
t += tstep;
|
|
} while (--spancount > 0);
|
|
}
|
|
else
|
|
{
|
|
do
|
|
{
|
|
int idiths = s;
|
|
int iditht = t;
|
|
|
|
int X = (pspan->u + spancount) & 1;
|
|
int Y = (pspan->v)&1;
|
|
if (*pz <= (izi >> 16))
|
|
{
|
|
pixel_t btemp;
|
|
|
|
//Using the kernel
|
|
idiths += kernel[X][Y][0];
|
|
iditht += kernel[X][Y][1];
|
|
|
|
idiths = idiths >> 16;
|
|
idiths = idiths ? idiths -1 : idiths;
|
|
|
|
|
|
iditht = iditht >> 16;
|
|
iditht = iditht ? iditht -1 : iditht;
|
|
|
|
btemp = *(pbase + idiths + iditht * cachewidth);
|
|
|
|
if( btemp != TRANSPARENT_COLOR )
|
|
{
|
|
btemp = BLEND_ADD( btemp, *pdest);
|
|
*pdest = btemp;
|
|
}
|
|
//*pz = izi >> 16;
|
|
}
|
|
pdest++;
|
|
pz++;
|
|
izi += izistep;
|
|
s += sstep;
|
|
t += tstep;
|
|
} while (--spancount > 0);
|
|
}
|
|
|
|
|
|
} while (count > 0);
|
|
|
|
} while ((pspan = pspan->pnext) != NULL);
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
#if !id386
|
|
|
|
/*
|
|
=============
|
|
D_DrawZSpans
|
|
=============
|
|
*/
|
|
void D_DrawZSpans (espan_t *pspan)
|
|
{
|
|
int count, doublecount, izistep;
|
|
int izi;
|
|
short *pdest;
|
|
unsigned ltemp;
|
|
float zi;
|
|
float du, dv;
|
|
|
|
// FIXME: check for clamping/range problems
|
|
// we count on FP exceptions being turned off to avoid range problems
|
|
izistep = (int)(d_zistepu * 0x8000 * 0x10000);
|
|
|
|
do
|
|
{
|
|
pdest = d_pzbuffer + (d_zwidth * pspan->v) + pspan->u;
|
|
|
|
count = pspan->count;
|
|
|
|
// calculate the initial 1/z
|
|
du = (float)pspan->u;
|
|
dv = (float)pspan->v;
|
|
|
|
zi = d_ziorigin + dv*d_zistepv + du*d_zistepu;
|
|
// we count on FP exceptions being turned off to avoid range problems
|
|
izi = (int)(zi * 0x8000 * 0x10000);
|
|
|
|
if ((unsigned long long)pdest & 0x02)
|
|
{
|
|
*pdest++ = (short)(izi >> 16);
|
|
izi += izistep;
|
|
count--;
|
|
}
|
|
|
|
if ((doublecount = count >> 1) > 0)
|
|
{
|
|
do
|
|
{
|
|
ltemp = izi >> 16;
|
|
izi += izistep;
|
|
ltemp |= izi & 0xFFFF0000;
|
|
izi += izistep;
|
|
*(int *)pdest = ltemp;
|
|
pdest += 2;
|
|
} while (--doublecount > 0);
|
|
}
|
|
|
|
if (count & 1)
|
|
*pdest = (short)(izi >> 16);
|
|
|
|
} while ((pspan = pspan->pnext) != NULL);
|
|
}
|
|
|
|
#endif
|
|
|