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https://git.code.sf.net/p/quake/quakeforge
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421 lines
11 KiB
C
421 lines
11 KiB
C
/*
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d_scan.c
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Portable C scan-level rasterization code, all pixel depths.
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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:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "QF/render.h"
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#include "d_local.h"
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#include "r_internal.h"
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byte *r_turb_pbase;
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byte *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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/*
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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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void
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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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/* FIXME: allocate these arrays properly */
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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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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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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) (vr_data.realtime * SPEED) & (CYCLE - 1));
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dest = ((byte*)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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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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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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#ifdef PIC
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#undef USE_INTEL_ASM //XXX asm pic hack
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#endif
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#ifndef USE_INTEL_ASM
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void
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D_DrawTurbulent8Span (void)
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{
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int sturb, tturb;
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do {
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sturb =
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((r_turb_s + r_turb_turb[(r_turb_t >> 16) & (CYCLE - 1)]) >> 16) &
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63;
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tturb =
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((r_turb_t + r_turb_turb[(r_turb_s >> 16) & (CYCLE - 1)]) >> 16) &
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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 // !USE_INTEL_ASM
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void
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Turbulent (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) (vr_data.realtime * 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 = (byte *) 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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r_turb_pdest = (byte *) d_viewbuffer + (screenwidth * pspan->v) +
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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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// 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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// 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
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// 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
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// <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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} else {
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// calculate s/z, t/z, zi->fixed s and t at last pixel in
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// span (so can't step off polygon), clamp, calculate s and t
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// steps across span by division, biasing steps low so we
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// don't run off the 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
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// from causing overstepping & running
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// off the 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
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// <0 steps
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if (r_turb_spancount > 1) {
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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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#ifndef USE_INTEL_ASM
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void
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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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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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// 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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// 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
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// 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
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// <0 steps
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sstep = (snext - s) >> 3;
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tstep = (tnext - t) >> 3;
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} else {
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// calculate s/z, t/z, zi->fixed s and t at last pixel in span
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// (so can't step off polygon), clamp, calculate s and t steps
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// across span by division, biasing steps low so we don't run
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// off the 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
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// from from causing overstepping &
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// running off the 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
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// <0 steps
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if (spancount > 1) {
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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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*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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#ifndef USE_INTEL_ASM
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void
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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 int 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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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 ((intptr_t) pdest & 0x02) {
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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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do {
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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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