Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
rockbox/apps/plugins/sdl/progs/quake/d_scan.c
Franklin Wei 49dd38c184 quake: further optimize D_DrawSpans8 
Found on http://forums.insideqc.com/viewtopic.php?f=3&t=3327

Adds 1.1FPS (+8%) on ipod6g.

Change-Id: I608588ff99d70ff5ce28d2c649afa4b10038cc03
2019-08-09 23:05:46 -04:00

632 lines
18 KiB
C
Raw Blame History

/*
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[MAXHEIGHT+(AMP2*2)];
int column[MAXWIDTH+(AMP2*2)];
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
=============
*/
#ifndef USE_PQ_OPT5
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);
}
#else
/*==============================================
// Fixed-point D_DrawSpans
//PocketQuake- Dan East
//fixed-point conversion- Jacco Biker
//unrolled- mh, MK, qbism
//============================================*/
int sdivzorig, sdivzstepv, sdivzstepu, sdivzstepu_fix;
int tdivzorig, tdivzstepv, tdivzstepu, tdivzstepu_fix;
int d_zistepu_fxp, d_zistepv_fxp, d_ziorigin_fxp;
int zistepu_fix;
#define FIXPOINTDIV 4194304.0f //qbism
//524288.0f is 13.19 fixed point
// 2097152.0f is 11.21
//4194304.0f is 10.22 (this is what PocketQuake used)
//8388608.0f is 9.23
void UpdateFixedPointVars16( int all )
{
// JB: Store texture transformation matrix in fixed point vars
if (all)
{
sdivzorig = (int)(FIXPOINTDIV * d_sdivzorigin);
tdivzorig = (int)(FIXPOINTDIV * d_tdivzorigin);
sdivzstepv = (int)(FIXPOINTDIV * d_sdivzstepv);
tdivzstepv = (int)(FIXPOINTDIV * d_tdivzstepv);
sdivzstepu = (int)(FIXPOINTDIV * d_sdivzstepu);
sdivzstepu_fix = sdivzstepu*16;
tdivzstepu = (int)(FIXPOINTDIV * d_tdivzstepu);
tdivzstepu_fix = tdivzstepu*16;
}
d_ziorigin_fxp = (int)(FIXPOINTDIV * d_ziorigin);
d_zistepv_fxp = (int)(FIXPOINTDIV * d_zistepv );
d_zistepu_fxp = (int)(FIXPOINTDIV * d_zistepu );
zistepu_fix = d_zistepu_fxp * 16;
}
void D_DrawSpans8 (espan_t *pspan) //qbism from PocketQuake
{
int count, spancount, spancountminus1;
unsigned char *pbase, *pdest;
fixed16_t s, t;
int zi, sdivz, tdivz, sstep, tstep;
int snext, tnext;
pbase = (unsigned char *)cacheblock;
//Jacco Biker's fixed point conversion
// Recalc fixed point values
UpdateFixedPointVars16( 1 );
do
{
pdest = (unsigned char *)((byte *)d_viewbuffer + (screenwidth * pspan->v) + pspan->u);
// calculate the initial s/z, t/z, 1/z, s, and t and clamp
sdivz = sdivzorig + pspan->v * sdivzstepv + pspan->u * sdivzstepu;
tdivz = tdivzorig + pspan->v * tdivzstepv + pspan->u * tdivzstepu;
zi = d_ziorigin_fxp + pspan->v * d_zistepv_fxp + pspan->u * d_zistepu_fxp;
if (zi == 0) zi = 1;
s = (((sdivz << 8) / zi) << 8) + sadjust; // 5.27 / 13.19 = 24.8 >> 8 = 16.16
if (s > bbextents) s = bbextents; else if (s < 0) s = 0;
t = (((tdivz << 8) / zi) << 8) + tadjust;
if (t > bbextentt) t = bbextentt; else if (t < 0) t = 0;
//End Jacco Biker mod
// Manoel Kasimier - begin
count = pspan->count >> 4;
spancount = pspan->count % 16;
// Manoel Kasimier - end
while (count-- >0) // Manoel Kasimier
{
// 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 += sdivzstepu_fix;
tdivz += tdivzstepu_fix;
zi += zistepu_fix;
if (!zi) zi = 1;
snext = (((sdivz<<8)/zi)<<8)+sadjust;
if (snext > bbextents)
snext = bbextents;
else if (snext < 16)
snext = 16; // prevent round-off error on <0 steps from causing overstepping & running off the edge of the texture
tnext = (((tdivz<<8)/zi)<<8) + tadjust;
if (tnext > bbextentt)
tnext = bbextentt;
else if (tnext < 16)
tnext = 16; // guard against round-off error on <0 steps
sstep = (snext - s) >> 4;
tstep = (tnext - t) >> 4;
pdest += 16;
pdest[-16] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[-15] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[-14] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[-13] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[-12] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[-11] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[-10] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[ -9] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[ -8] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[ -7] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[ -6] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[ -5] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[ -4] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[ -3] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[ -2] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
pdest[ -1] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
// Manoel Kasimier - end
s = snext;
t = tnext;
// Manoel Kasimier - begin
}
if (spancount > 0)
{
// Manoel Kasimier - end
// 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 = spancount - 1;
sdivz += sdivzstepu * spancountminus1;
tdivz += tdivzstepu * spancountminus1;
zi += d_zistepu_fxp * spancountminus1;
//if (!zi) zi = 1;
//z = zi;//(float)0x10000 / zi; // prescale to 16.16 fixed-point
snext = (((sdivz<<8) / zi)<<8) + sadjust;
if (snext > bbextents)
snext = bbextents;
else if (snext < 16)
snext = 16; // prevent round-off error on <0 steps from causing overstepping & running off the edge of the texture
tnext = (((tdivz<<8) / zi)<<8) + tadjust;
if (tnext > bbextentt)
tnext = bbextentt;
else if (tnext < 16)
tnext = 16; // guard against round-off error on <0 steps
if (spancount > 1)
{
sstep = ((snext - s)) / ((spancount - 1));
tstep = ((tnext - t)) / ((spancount - 1));
}
pdest += spancount;
switch (spancount)
{
case 16: pdest[-16] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 15: pdest[-15] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 14: pdest[-14] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 13: pdest[-13] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 12: pdest[-12] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 11: pdest[-11] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 10: pdest[-10] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 9: pdest[ -9] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 8: pdest[ -8] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 7: pdest[ -7] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 6: pdest[ -6] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 5: pdest[ -5] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 4: pdest[ -4] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 3: pdest[ -3] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 2: pdest[ -2] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
case 1: pdest[ -1] = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep;
break;
}
}
} while ((pspan = pspan->pnext) != NULL);
}
#endif
#endif // !id386
#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 a new issue View git blame Copy permalink