mirror of
https://github.com/id-Software/Quake.git
synced 2026-03-20 00:49:48 +01:00
The Quake sources as originally release under the GPL license on December 21, 1999
This commit is contained in:
Travis Bradshaw
446
QW/client/d_scan.c
Normal file
446
QW/client/d_scan.c
Normal file
@@ -0,0 +1,446 @@
|
||||
/*
|
||||
Copyright (C) 1996-1997 Id Software, Inc.
|
||||
|
||||
This program is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU General Public License
|
||||
as published by the Free Software Foundation; either version 2
|
||||
of the License, or (at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
||||
|
||||
See the GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program; if not, write to the Free Software
|
||||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
||||
|
||||
*/
|
||||
// d_scan.c
|
||||
//
|
||||
// Portable C scan-level rasterization code, all pixel depths.
|
||||
|
||||
#include "quakedef.h"
|
||||
#include "r_local.h"
|
||||
#include "d_local.h"
|
||||
|
||||
unsigned char *r_turb_pbase, *r_turb_pdest;
|
||||
fixed16_t r_turb_s, r_turb_t, r_turb_sstep, r_turb_tstep;
|
||||
int *r_turb_turb;
|
||||
int r_turb_spancount;
|
||||
|
||||
void D_DrawTurbulent8Span (void);
|
||||
|
||||
|
||||
/*
|
||||
=============
|
||||
D_WarpScreen
|
||||
|
||||
// this performs a slight compression of the screen at the same time as
|
||||
// the sine warp, to keep the edges from wrapping
|
||||
=============
|
||||
*/
|
||||
void D_WarpScreen (void)
|
||||
{
|
||||
int w, h;
|
||||
int u,v;
|
||||
byte *dest;
|
||||
int *turb;
|
||||
int *col;
|
||||
byte **row;
|
||||
byte *rowptr[1024];
|
||||
int column[1280];
|
||||
float wratio, hratio;
|
||||
|
||||
w = r_refdef.vrect.width;
|
||||
h = r_refdef.vrect.height;
|
||||
|
||||
wratio = w / (float)scr_vrect.width;
|
||||
hratio = h / (float)scr_vrect.height;
|
||||
|
||||
for (v=0 ; v<scr_vrect.height+AMP2*2 ; v++)
|
||||
{
|
||||
rowptr[v] = d_viewbuffer + (r_refdef.vrect.y * screenwidth) +
|
||||
(screenwidth * (int)((float)v * hratio * h / (h + AMP2 * 2)));
|
||||
}
|
||||
|
||||
for (u=0 ; u<scr_vrect.width+AMP2*2 ; u++)
|
||||
{
|
||||
column[u] = r_refdef.vrect.x +
|
||||
(int)((float)u * wratio * w / (w + AMP2 * 2));
|
||||
}
|
||||
|
||||
turb = intsintable + ((int)(cl.time*SPEED)&(CYCLE-1));
|
||||
dest = vid.buffer + scr_vrect.y * vid.rowbytes + scr_vrect.x;
|
||||
|
||||
for (v=0 ; v<scr_vrect.height ; v++, dest += vid.rowbytes)
|
||||
{
|
||||
col = &column[turb[v]];
|
||||
row = &rowptr[v];
|
||||
for (u=0 ; u<scr_vrect.width ; u+=4)
|
||||
{
|
||||
dest[u+0] = row[turb[u+0]][col[u+0]];
|
||||
dest[u+1] = row[turb[u+1]][col[u+1]];
|
||||
dest[u+2] = row[turb[u+2]][col[u+2]];
|
||||
dest[u+3] = row[turb[u+3]][col[u+3]];
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
#if !id386
|
||||
|
||||
/*
|
||||
=============
|
||||
D_DrawTurbulent8Span
|
||||
=============
|
||||
*/
|
||||
void D_DrawTurbulent8Span (void)
|
||||
{
|
||||
int sturb, tturb;
|
||||
|
||||
do
|
||||
{
|
||||
sturb = ((r_turb_s + r_turb_turb[(r_turb_t>>16)&(CYCLE-1)])>>16)&63;
|
||||
tturb = ((r_turb_t + r_turb_turb[(r_turb_s>>16)&(CYCLE-1)])>>16)&63;
|
||||
*r_turb_pdest++ = *(r_turb_pbase + (tturb<<6) + sturb);
|
||||
r_turb_s += r_turb_sstep;
|
||||
r_turb_t += r_turb_tstep;
|
||||
} while (--r_turb_spancount > 0);
|
||||
}
|
||||
|
||||
#endif // !id386
|
||||
|
||||
/*
|
||||
=============
|
||||
Turbulent8
|
||||
=============
|
||||
*/
|
||||
void Turbulent8 (espan_t *pspan)
|
||||
{
|
||||
int count;
|
||||
fixed16_t snext, tnext;
|
||||
float sdivz, tdivz, zi, z, du, dv, spancountminus1;
|
||||
float sdivz16stepu, tdivz16stepu, zi16stepu;
|
||||
|
||||
r_turb_turb = sintable + ((int)(cl.time*SPEED)&(CYCLE-1));
|
||||
|
||||
r_turb_sstep = 0; // keep compiler happy
|
||||
r_turb_tstep = 0; // ditto
|
||||
|
||||
r_turb_pbase = (unsigned char *)cacheblock;
|
||||
|
||||
sdivz16stepu = d_sdivzstepu * 16;
|
||||
tdivz16stepu = d_tdivzstepu * 16;
|
||||
zi16stepu = d_zistepu * 16;
|
||||
|
||||
do
|
||||
{
|
||||
r_turb_pdest = (unsigned char *)((byte *)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;
|
||||
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
||||
|
||||
r_turb_s = (int)(sdivz * z) + sadjust;
|
||||
if (r_turb_s > bbextents)
|
||||
r_turb_s = bbextents;
|
||||
else if (r_turb_s < 0)
|
||||
r_turb_s = 0;
|
||||
|
||||
r_turb_t = (int)(tdivz * z) + tadjust;
|
||||
if (r_turb_t > bbextentt)
|
||||
r_turb_t = bbextentt;
|
||||
else if (r_turb_t < 0)
|
||||
r_turb_t = 0;
|
||||
|
||||
do
|
||||
{
|
||||
// calculate s and t at the far end of the span
|
||||
if (count >= 16)
|
||||
r_turb_spancount = 16;
|
||||
else
|
||||
r_turb_spancount = count;
|
||||
|
||||
count -= r_turb_spancount;
|
||||
|
||||
if (count)
|
||||
{
|
||||
// calculate s/z, t/z, zi->fixed s and t at far end of span,
|
||||
// calculate s and t steps across span by shifting
|
||||
sdivz += sdivz16stepu;
|
||||
tdivz += tdivz16stepu;
|
||||
zi += zi16stepu;
|
||||
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
||||
|
||||
snext = (int)(sdivz * z) + sadjust;
|
||||
if (snext > bbextents)
|
||||
snext = bbextents;
|
||||
else if (snext < 16)
|
||||
snext = 16; // prevent round-off error on <0 steps from
|
||||
// from causing overstepping & running off the
|
||||
// edge of the texture
|
||||
|
||||
tnext = (int)(tdivz * z) + tadjust;
|
||||
if (tnext > bbextentt)
|
||||
tnext = bbextentt;
|
||||
else if (tnext < 16)
|
||||
tnext = 16; // guard against round-off error on <0 steps
|
||||
|
||||
r_turb_sstep = (snext - r_turb_s) >> 4;
|
||||
r_turb_tstep = (tnext - r_turb_t) >> 4;
|
||||
}
|
||||
else
|
||||
{
|
||||
// calculate s/z, t/z, zi->fixed s and t at last pixel in span (so
|
||||
// can't step off polygon), clamp, calculate s and t steps across
|
||||
// span by division, biasing steps low so we don't run off the
|
||||
// texture
|
||||
spancountminus1 = (float)(r_turb_spancount - 1);
|
||||
sdivz += d_sdivzstepu * spancountminus1;
|
||||
tdivz += d_tdivzstepu * spancountminus1;
|
||||
zi += d_zistepu * spancountminus1;
|
||||
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
||||
snext = (int)(sdivz * z) + sadjust;
|
||||
if (snext > bbextents)
|
||||
snext = bbextents;
|
||||
else if (snext < 16)
|
||||
snext = 16; // prevent round-off error on <0 steps from
|
||||
// from causing overstepping & running off the
|
||||
// edge of the texture
|
||||
|
||||
tnext = (int)(tdivz * z) + tadjust;
|
||||
if (tnext > bbextentt)
|
||||
tnext = bbextentt;
|
||||
else if (tnext < 16)
|
||||
tnext = 16; // guard against round-off error on <0 steps
|
||||
|
||||
if (r_turb_spancount > 1)
|
||||
{
|
||||
r_turb_sstep = (snext - r_turb_s) / (r_turb_spancount - 1);
|
||||
r_turb_tstep = (tnext - r_turb_t) / (r_turb_spancount - 1);
|
||||
}
|
||||
}
|
||||
|
||||
r_turb_s = r_turb_s & ((CYCLE<<16)-1);
|
||||
r_turb_t = r_turb_t & ((CYCLE<<16)-1);
|
||||
|
||||
D_DrawTurbulent8Span ();
|
||||
|
||||
r_turb_s = snext;
|
||||
r_turb_t = tnext;
|
||||
|
||||
} while (count > 0);
|
||||
|
||||
} while ((pspan = pspan->pnext) != NULL);
|
||||
}
|
||||
|
||||
|
||||
#if !id386
|
||||
|
||||
/*
|
||||
=============
|
||||
D_DrawSpans8
|
||||
=============
|
||||
*/
|
||||
void D_DrawSpans8 (espan_t *pspan)
|
||||
{
|
||||
int count, spancount;
|
||||
unsigned char *pbase, *pdest;
|
||||
fixed16_t s, t, snext, tnext, sstep, tstep;
|
||||
float sdivz, tdivz, zi, z, du, dv, spancountminus1;
|
||||
float sdivz8stepu, tdivz8stepu, zi8stepu;
|
||||
|
||||
sstep = 0; // keep compiler happy
|
||||
tstep = 0; // ditto
|
||||
|
||||
pbase = (unsigned char *)cacheblock;
|
||||
|
||||
sdivz8stepu = d_sdivzstepu * 8;
|
||||
tdivz8stepu = d_tdivzstepu * 8;
|
||||
zi8stepu = d_zistepu * 8;
|
||||
|
||||
do
|
||||
{
|
||||
pdest = (unsigned char *)((byte *)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;
|
||||
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
||||
|
||||
s = (int)(sdivz * z) + sadjust;
|
||||
if (s > bbextents)
|
||||
s = bbextents;
|
||||
else if (s < 0)
|
||||
s = 0;
|
||||
|
||||
t = (int)(tdivz * z) + tadjust;
|
||||
if (t > bbextentt)
|
||||
t = bbextentt;
|
||||
else if (t < 0)
|
||||
t = 0;
|
||||
|
||||
do
|
||||
{
|
||||
// calculate s and t at the far end of the span
|
||||
if (count >= 8)
|
||||
spancount = 8;
|
||||
else
|
||||
spancount = count;
|
||||
|
||||
count -= spancount;
|
||||
|
||||
if (count)
|
||||
{
|
||||
// calculate s/z, t/z, zi->fixed s and t at far end of span,
|
||||
// calculate s and t steps across span by shifting
|
||||
sdivz += sdivz8stepu;
|
||||
tdivz += tdivz8stepu;
|
||||
zi += zi8stepu;
|
||||
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
||||
|
||||
snext = (int)(sdivz * z) + sadjust;
|
||||
if (snext > bbextents)
|
||||
snext = bbextents;
|
||||
else if (snext < 8)
|
||||
snext = 8; // prevent round-off error on <0 steps from
|
||||
// from causing overstepping & running off the
|
||||
// edge of the texture
|
||||
|
||||
tnext = (int)(tdivz * z) + tadjust;
|
||||
if (tnext > bbextentt)
|
||||
tnext = bbextentt;
|
||||
else if (tnext < 8)
|
||||
tnext = 8; // guard against round-off error on <0 steps
|
||||
|
||||
sstep = (snext - s) >> 3;
|
||||
tstep = (tnext - t) >> 3;
|
||||
}
|
||||
else
|
||||
{
|
||||
// calculate s/z, t/z, zi->fixed s and t at last pixel in span (so
|
||||
// can't step off polygon), clamp, calculate s and t steps across
|
||||
// span by division, biasing steps low so we don't run off the
|
||||
// texture
|
||||
spancountminus1 = (float)(spancount - 1);
|
||||
sdivz += d_sdivzstepu * spancountminus1;
|
||||
tdivz += d_tdivzstepu * spancountminus1;
|
||||
zi += d_zistepu * spancountminus1;
|
||||
z = (float)0x10000 / zi; // prescale to 16.16 fixed-point
|
||||
snext = (int)(sdivz * z) + sadjust;
|
||||
if (snext > bbextents)
|
||||
snext = bbextents;
|
||||
else if (snext < 8)
|
||||
snext = 8; // prevent round-off error on <0 steps from
|
||||
// from causing overstepping & running off the
|
||||
// edge of the texture
|
||||
|
||||
tnext = (int)(tdivz * z) + tadjust;
|
||||
if (tnext > bbextentt)
|
||||
tnext = bbextentt;
|
||||
else if (tnext < 8)
|
||||
tnext = 8; // guard against round-off error on <0 steps
|
||||
|
||||
if (spancount > 1)
|
||||
{
|
||||
sstep = (snext - s) / (spancount - 1);
|
||||
tstep = (tnext - t) / (spancount - 1);
|
||||
}
|
||||
}
|
||||
|
||||
do
|
||||
{
|
||||
*pdest++ = *(pbase + (s >> 16) + (t >> 16) * cachewidth);
|
||||
s += sstep;
|
||||
t += tstep;
|
||||
} while (--spancount > 0);
|
||||
|
||||
s = snext;
|
||||
t = tnext;
|
||||
|
||||
} while (count > 0);
|
||||
|
||||
} while ((pspan = pspan->pnext) != NULL);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
|
||||
#if !id386
|
||||
|
||||
/*
|
||||
=============
|
||||
D_DrawZSpans
|
||||
=============
|
||||
*/
|
||||
void D_DrawZSpans (espan_t *pspan)
|
||||
{
|
||||
int count, doublecount, izistep;
|
||||
int izi;
|
||||
short *pdest;
|
||||
unsigned ltemp;
|
||||
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);
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
#endif
|
||||
Reference in New Issue
Block a user