450 lines
11 KiB
C
450 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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