mirror of
https://git.code.sf.net/p/quake/quakeforge-old
synced 2024-11-14 08:20:57 +00:00
c3f5581b0a
Unchained, Ultimate, Ultra, Up Yours, Underworld, Underground, Unified, Unity, etc. You know the drill. This takes care of the "standalone" problem with the wrong name, and the recent snafu with multiple developers working on the same files simultaneously...expect me (and probably others) to start locking dirs when updates are taking place. And yes, this update is really as large as it looks. Software only at the moment, but I will have the makefile updated to build the GL builds as well.
449 lines
11 KiB
C
449 lines
11 KiB
C
/*
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Copyright (C) 1996-1997 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 "quakedef.h"
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#include "r_local.h"
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#include "d_local.h"
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unsigned char *r_turb_pbase, *r_turb_pdest;
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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_turb;
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int r_turb_spancount;
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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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int w, h;
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int u,v;
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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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byte *rowptr[MAXHEIGHT+(AMP2*2)];
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int column[MAXWIDTH+(AMP2*2)];
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float wratio, hratio;
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w = r_refdef.vrect.width;
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h = r_refdef.vrect.height;
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wratio = w / (float)scr_vrect.width;
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hratio = h / (float)scr_vrect.height;
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for (v=0 ; v<scr_vrect.height+AMP2*2 ; v++)
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{
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rowptr[v] = d_viewbuffer + (r_refdef.vrect.y * screenwidth) +
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(screenwidth * (int)((float)v * hratio * h / (h + AMP2 * 2)));
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}
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for (u=0 ; u<scr_vrect.width+AMP2*2 ; u++)
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{
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column[u] = r_refdef.vrect.x +
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(int)((float)u * wratio * w / (w + AMP2 * 2));
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}
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turb = intsintable + ((int)(cl.time*SPEED)&(CYCLE-1));
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dest = vid.buffer + scr_vrect.y * vid.rowbytes + scr_vrect.x;
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for (v=0 ; v<scr_vrect.height ; 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<scr_vrect.width ; 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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}
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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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#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)(cl.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 = (unsigned char *)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 = (unsigned char *)((byte *)d_viewbuffer +
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(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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#if !id386
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/*
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=============
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D_DrawSpans8
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=============
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*/
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void D_DrawSpans8 (espan_t *pspan)
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{
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int count, spancount;
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unsigned char *pbase, *pdest;
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fixed16_t s, t, snext, tnext, sstep, tstep;
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float sdivz, tdivz, zi, z, du, dv, spancountminus1;
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float sdivz8stepu, tdivz8stepu, zi8stepu;
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sstep = 0; // keep compiler happy
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tstep = 0; // ditto
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pbase = (unsigned char *)cacheblock;
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sdivz8stepu = d_sdivzstepu * 8;
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tdivz8stepu = d_tdivzstepu * 8;
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zi8stepu = d_zistepu * 8;
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do
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{
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pdest = (unsigned char *)((byte *)d_viewbuffer +
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(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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s = (int)(sdivz * z) + sadjust;
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if (s > bbextents)
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s = bbextents;
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else if (s < 0)
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s = 0;
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t = (int)(tdivz * z) + tadjust;
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if (t > bbextentt)
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t = bbextentt;
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else if (t < 0)
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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 >= 8)
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spancount = 8;
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else
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spancount = count;
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count -= 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 += sdivz8stepu;
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tdivz += tdivz8stepu;
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zi += zi8stepu;
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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 < 8)
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snext = 8; // 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 < 8)
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tnext = 8; // guard against round-off error on <0 steps
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sstep = (snext - s) >> 3;
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tstep = (tnext - t) >> 3;
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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)(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 < 8)
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snext = 8; // 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 < 8)
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tnext = 8; // guard against round-off error on <0 steps
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if (spancount > 1)
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{
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sstep = (snext - s) / (spancount - 1);
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tstep = (tnext - t) / (spancount - 1);
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}
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}
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do
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{
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*pdest++ = *(pbase + (s >> 16) + (t >> 16) * cachewidth);
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s += sstep;
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t += tstep;
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} while (--spancount > 0);
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s = snext;
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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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#endif
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#if !id386
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/*
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=============
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D_DrawZSpans
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=============
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*/
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void D_DrawZSpans (espan_t *pspan)
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{
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int count, doublecount, izistep;
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int izi;
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short *pdest;
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unsigned ltemp;
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double zi;
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float du, dv;
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// FIXME: check for clamping/range problems
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// we count on FP exceptions being turned off to avoid range problems
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izistep = (int)(d_zistepu * 0x8000 * 0x10000);
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do
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{
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pdest = d_pzbuffer + (d_zwidth * pspan->v) + pspan->u;
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count = pspan->count;
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// calculate the initial 1/z
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du = (float)pspan->u;
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dv = (float)pspan->v;
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zi = d_ziorigin + dv*d_zistepv + du*d_zistepu;
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// we count on FP exceptions being turned off to avoid range problems
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izi = (int)(zi * 0x8000 * 0x10000);
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if ((long)pdest & 0x02)
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{
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*pdest++ = (short)(izi >> 16);
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izi += izistep;
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count--;
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}
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if ((doublecount = count >> 1) > 0)
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{
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do
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{
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ltemp = izi >> 16;
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izi += izistep;
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ltemp |= izi & 0xFFFF0000;
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izi += izistep;
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*(int *)pdest = ltemp;
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pdest += 2;
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} while (--doublecount > 0);
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}
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if (count & 1)
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*pdest = (short)(izi >> 16);
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} while ((pspan = pspan->pnext) != NULL);
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}
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#endif
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