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https://git.code.sf.net/p/quake/quakeforge
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891 lines
24 KiB
C
891 lines
24 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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$Id$
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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/qendian.h"
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#include "QF/render.h"
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#include "QF/sys.h"
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#include "compat.h"
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#include "d_local.h"
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#include "r_local.h"
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byte *r_turb_pbase;
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void *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_DrawTurbulentSpan (void);
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extern float d_zitable[65536];
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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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switch(r_pixbytes) {
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case 1:
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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[1024];
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int column[1280];
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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] = (byte *) d_viewbuffer + (r_refdef.vrect.y *
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screenwidth) +
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(screenwidth * (int) ((float) v * hratio * h /
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(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) (r_realtime * SPEED) & (CYCLE - 1));
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dest = (byte *) (vid.buffer + scr_vrect.y * vid.rowbytes +
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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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break;
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case 2:
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{
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int w, h;
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int u, v;
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short *dest;
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int *turb;
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int *col;
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short **row;
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short *rowptr[1024];
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int column[1280];
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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] = (short *) d_viewbuffer +
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(r_refdef.vrect.y * screenwidth) +
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(screenwidth * (int) ((float) v * hratio * h /
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(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) (r_realtime * SPEED) & (CYCLE - 1));
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dest = (short *) vid.buffer + scr_vrect.y * (vid.rowbytes >> 1) +
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scr_vrect.x;
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for (v = 0; v < scr_vrect.height; v++, dest += (vid.rowbytes >> 1)) {
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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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break;
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case 4:
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{
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int w, h;
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int u, v;
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int *dest;
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int *turb;
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int *col;
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int **row;
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int *rowptr[1024];
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int column[1280];
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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] = (int *) d_viewbuffer +
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(r_refdef.vrect.y * screenwidth) +
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(screenwidth * (int) ((float) v * hratio * h /
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(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) (r_realtime * SPEED) & (CYCLE - 1));
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dest = (int *) vid.buffer + scr_vrect.y * (vid.rowbytes >> 2) +
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scr_vrect.x;
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for (v = 0; v < scr_vrect.height; v++, dest += (vid.rowbytes >> 2)) {
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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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break;
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default:
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Sys_Error("D_WarpScreen: unsupported r_pixbytes %i\n", r_pixbytes);
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}
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}
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void
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D_DrawTurbulentSpan (void)
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{
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int sturb, tturb;
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switch (r_pixbytes) {
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case 1:
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{
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byte *pdest = (byte *) r_turb_pdest;
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do {
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sturb = ((r_turb_s + r_turb_turb[(r_turb_t >> 16) &
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(CYCLE - 1)]) >> 16) & 63;
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tturb = ((r_turb_t + r_turb_turb[(r_turb_s >> 16) &
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(CYCLE - 1)]) >> 16) & 63;
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*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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r_turb_pdest = (byte *)pdest;
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}
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break;
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case 2:
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{
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short *pdest = (short *) r_turb_pdest;
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do {
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sturb = ((r_turb_s + r_turb_turb[(r_turb_t >> 16) &
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(CYCLE - 1)]) >> 16) & 63;
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tturb = ((r_turb_t + r_turb_turb[(r_turb_s >> 16) &
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(CYCLE - 1)]) >> 16) & 63;
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*pdest++ = d_8to16table[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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r_turb_pdest = (byte *)pdest;
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}
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break;
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case 4:
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{
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int *pdest = (int *) r_turb_pdest;
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do {
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sturb = ((r_turb_s + r_turb_turb[(r_turb_t >> 16) &
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(CYCLE - 1)]) >> 16) & 63;
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tturb = ((r_turb_t + r_turb_turb[(r_turb_s >> 16) &
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(CYCLE - 1)]) >> 16) & 63;
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*pdest++ = d_8to24table[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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r_turb_pdest = (byte *)pdest;
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}
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break;
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default:
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Sys_Error("D_DrawTurbulentSpan: unsupported r_pixbytes %i\n",
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r_pixbytes);
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}
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}
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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) (r_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 * 65536;
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do {
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r_turb_pdest = ((byte *) d_viewbuffer + ((screenwidth * pspan->v) +
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pspan->u) * r_pixbytes);
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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) * 65536.0f;
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z = d_zitable[(int) zi];
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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 = d_zitable[(int) zi];
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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
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// can't step off polygon), clamp, calculate s and t steps
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// across
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// span by division, biasing steps low so we don't run off
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// 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 * 65536.0f * spancountminus1;
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z = d_zitable[(int) zi];
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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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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_DrawTurbulentSpan ();
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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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void
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D_DrawSpans (espan_t *pspan)
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{
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switch(r_pixbytes) {
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case 1:
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{
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byte *pbase = (byte *) cacheblock, *pdest;
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int count;
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fixed16_t s, t, snext, tnext, sstep, tstep;
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float sdivz, tdivz, zi, z, du, dv;
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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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sdivz8stepu = d_sdivzstepu * 8;
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tdivz8stepu = d_tdivzstepu * 8;
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zi8stepu = d_zistepu * 8 * 65536;
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do {
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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) * 65536.0f;
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z = d_zitable[(int) zi];
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s = (int) (sdivz * z) + sadjust;
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s = bound(0, s, bbextents);
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t = (int) (tdivz * z) + tadjust;
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t = bound(0, t, bbextentt);
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while(count >= 8) {
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count -= 8;
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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 = d_zitable[(int) zi];
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// prevent round-off error on <0 steps from from causing
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// overstepping & running off the edge of the texture
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snext = (int) (sdivz * z) + sadjust;
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snext = bound(8, snext, bbextents);
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tnext = (int) (tdivz * z) + tadjust;
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tnext = bound(8, tnext, bbextentt);
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sstep = (snext - s) >> 3;
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tstep = (tnext - t) >> 3;
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pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
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s += sstep;t += tstep;
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pdest[1] = pbase[(t >> 16) * cachewidth + (s >> 16)];
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s += sstep;
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t += tstep;
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pdest[2] = pbase[(t >> 16) * cachewidth + (s >> 16)];
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s += sstep;
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t += tstep;
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pdest[3] = pbase[(t >> 16) * cachewidth + (s >> 16)];
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s += sstep;
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t += tstep;
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pdest[4] = pbase[(t >> 16) * cachewidth + (s >> 16)];
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s += sstep;
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t += tstep;
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pdest[5] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[6] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[7] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s = snext;
|
|
t = tnext;
|
|
pdest += 8;
|
|
}
|
|
if (count)
|
|
{
|
|
// 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
|
|
//countminus1 = (float) (count - 1);
|
|
sdivz += d_sdivzstepu * count; //minus1;
|
|
tdivz += d_tdivzstepu * count; //minus1;
|
|
zi += d_zistepu * 65536.0f * count; //minus1;
|
|
z = d_zitable[(int) zi];
|
|
|
|
// prevent round-off error on <0 steps from from causing
|
|
// overstepping & running off the edge of the texture
|
|
snext = (int) (sdivz * z) + sadjust;
|
|
snext = bound(count, snext, bbextents);
|
|
tnext = (int) (tdivz * z) + tadjust;
|
|
tnext = bound(count, tnext, bbextentt);
|
|
|
|
if (count > 1) {
|
|
sstep = (snext - s) / count; //(count - 1);
|
|
tstep = (tnext - t) / count; //(count - 1);
|
|
|
|
if (count & 4)
|
|
{
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[1] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[2] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[3] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest += 4;
|
|
}
|
|
if (count & 2)
|
|
{
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[1] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest += 2;
|
|
}
|
|
if (count & 1)
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
}
|
|
else
|
|
{
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
}
|
|
}
|
|
} while ((pspan = pspan->pnext) != NULL);
|
|
}
|
|
break;
|
|
case 2:
|
|
{
|
|
short *pbase = (short *) cacheblock, *pdest;
|
|
int count;
|
|
fixed16_t s, t, snext, tnext, sstep, tstep;
|
|
float sdivz, tdivz, zi, z, du, dv;
|
|
float sdivz8stepu, tdivz8stepu, zi8stepu;
|
|
|
|
sstep = 0; // keep compiler happy
|
|
tstep = 0; // ditto
|
|
|
|
sdivz8stepu = d_sdivzstepu * 8;
|
|
tdivz8stepu = d_tdivzstepu * 8;
|
|
zi8stepu = d_zistepu * 8 * 65536;
|
|
|
|
do {
|
|
pdest = (short *) d_viewbuffer + (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) * 65536.0f;
|
|
z = d_zitable[(int) zi];
|
|
|
|
s = (int) (sdivz * z) + sadjust;
|
|
s = bound(0, s, bbextents);
|
|
t = (int) (tdivz * z) + tadjust;
|
|
t = bound(0, t, bbextentt);
|
|
|
|
while(count >= 8) {
|
|
count -= 8;
|
|
// 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 = d_zitable[(int) zi];
|
|
|
|
// prevent round-off error on <0 steps from from causing
|
|
// overstepping & running off the edge of the texture
|
|
snext = (int) (sdivz * z) + sadjust;
|
|
snext = bound(8, snext, bbextents);
|
|
tnext = (int) (tdivz * z) + tadjust;
|
|
tnext = bound(8, tnext, bbextentt);
|
|
|
|
sstep = (snext - s) >> 3;
|
|
tstep = (tnext - t) >> 3;
|
|
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[1] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[2] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[3] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[4] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[5] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[6] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[7] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s = snext;t = tnext;
|
|
pdest += 8;
|
|
}
|
|
if (count)
|
|
{
|
|
// 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
|
|
//countminus1 = (float) (count - 1);
|
|
sdivz += d_sdivzstepu * count; //minus1;
|
|
tdivz += d_tdivzstepu * count; //minus1;
|
|
zi += d_zistepu * 65536.0f * count; //minus1;
|
|
z = d_zitable[(int) zi];
|
|
|
|
// prevent round-off error on <0 steps from from causing
|
|
// overstepping & running off the edge of the texture
|
|
snext = (int) (sdivz * z) + sadjust;
|
|
snext = bound(count, snext, bbextents);
|
|
tnext = (int) (tdivz * z) + tadjust;
|
|
tnext = bound(count, tnext, bbextentt);
|
|
|
|
if (count > 1) {
|
|
sstep = (snext - s) / count; //(count - 1);
|
|
tstep = (tnext - t) / count; //(count - 1);
|
|
|
|
if (count & 4)
|
|
{
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[1] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[2] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[3] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;t += tstep;
|
|
pdest += 4;
|
|
}
|
|
if (count & 2)
|
|
{
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[1] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest += 2;
|
|
}
|
|
if (count & 1)
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
}
|
|
else
|
|
{
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
}
|
|
}
|
|
} while ((pspan = pspan->pnext) != NULL);
|
|
}
|
|
break;
|
|
case 4:
|
|
{
|
|
int *pbase = (int *) cacheblock, *pdest;
|
|
int count;
|
|
fixed16_t s, t, snext, tnext, sstep, tstep;
|
|
float sdivz, tdivz, zi, z, du, dv;
|
|
float sdivz8stepu, tdivz8stepu, zi8stepu;
|
|
|
|
sstep = 0; // keep compiler happy
|
|
tstep = 0; // ditto
|
|
|
|
sdivz8stepu = d_sdivzstepu * 8;
|
|
tdivz8stepu = d_tdivzstepu * 8;
|
|
zi8stepu = d_zistepu * 8 * 65536;
|
|
|
|
do {
|
|
pdest = (int *) d_viewbuffer + (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) * 65536.0f;
|
|
z = d_zitable[(int) zi];
|
|
|
|
s = (int) (sdivz * z) + sadjust;
|
|
s = bound(0, s, bbextents);
|
|
t = (int) (tdivz * z) + tadjust;
|
|
t = bound(0, t, bbextentt);
|
|
|
|
while(count >= 8) {
|
|
count -= 8;
|
|
// 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 = d_zitable[(int) zi];
|
|
|
|
// prevent round-off error on <0 steps from from causing
|
|
// overstepping & running off the edge of the texture
|
|
snext = (int) (sdivz * z) + sadjust;
|
|
snext = bound(8, snext, bbextents);
|
|
tnext = (int) (tdivz * z) + tadjust;
|
|
tnext = bound(8, tnext, bbextentt);
|
|
|
|
sstep = (snext - s) >> 3;
|
|
tstep = (tnext - t) >> 3;
|
|
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[1] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[2] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[3] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[4] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[5] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[6] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[7] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s = snext;
|
|
t = tnext;
|
|
pdest += 8;
|
|
}
|
|
if (count)
|
|
{
|
|
// 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
|
|
//countminus1 = (float) (count - 1);
|
|
sdivz += d_sdivzstepu * count; //minus1;
|
|
tdivz += d_tdivzstepu * count; //minus1;
|
|
zi += d_zistepu * 65536.0f * count; //minus1;
|
|
z = d_zitable[(int) zi];
|
|
|
|
// prevent round-off error on <0 steps from from causing
|
|
// overstepping & running off the edge of the texture
|
|
snext = (int) (sdivz * z) + sadjust;
|
|
snext = bound(count, snext, bbextents);
|
|
tnext = (int) (tdivz * z) + tadjust;
|
|
tnext = bound(count, tnext, bbextentt);
|
|
|
|
if (count > 1) {
|
|
sstep = (snext - s) / count; //(count - 1);
|
|
tstep = (tnext - t) / count; //(count - 1);
|
|
|
|
if (count & 4)
|
|
{
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[1] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[2] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[3] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest += 4;
|
|
}
|
|
if (count & 2)
|
|
{
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest[1] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
pdest += 2;
|
|
}
|
|
if (count & 1)
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
}
|
|
else
|
|
{
|
|
pdest[0] = pbase[(t >> 16) * cachewidth + (s >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
}
|
|
}
|
|
} while ((pspan = pspan->pnext) != NULL);
|
|
}
|
|
break;
|
|
default:
|
|
Sys_Error("D_DrawSpans: unsupported r_pixbytes %i\n", r_pixbytes);
|
|
}
|
|
}
|
|
|
|
void
|
|
D_DrawZSpans (espan_t *pspan)
|
|
{
|
|
int count, doublecount, izistep;
|
|
int izi;
|
|
short *pdest;
|
|
unsigned int ltemp;
|
|
double 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);
|
|
|
|
// LordHavoc: added big endian case, the old code is not correct on
|
|
// big-endian (results in swapped depth pairs), and is tuned more for
|
|
// x86, PowerPC compilers can probably do a good job with raw loop
|
|
// unrolling if it is even necessary...
|
|
if (bigendien)
|
|
{
|
|
do
|
|
{
|
|
*pdest++ = (short) (izi >> 16);
|
|
izi += izistep;
|
|
}
|
|
while(--count);
|
|
}
|
|
else
|
|
{
|
|
if ((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);
|
|
}
|