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quakeforge/libs/video/renderer/sw32/d_sprite.c
Bill Currie 23a38738fc Massive whitespace cleanup. 
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2012-05-22 08:23:22 +09:00

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/*
d_sprite.c
software top-level rasterization driver module for drawing sprites
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#define NH_DEFINE
#include "namehack.h"
#include "QF/render.h"
#include "QF/sys.h"
#include "compat.h"
#include "d_local.h"
#include "r_internal.h"
#include "vid_internal.h"
static int sprite_height;
static int minindex, maxindex;
static sspan_t *sprite_spans;
void
sw32_D_SpriteDrawSpans (sspan_t *pspan)
{
switch(sw32_r_pixbytes) {
case 1:
{
int count, spancount, izistep;
int izi;
byte *pbase;
byte *pdest;
fixed16_t s, t, snext, tnext, sstep, tstep;
float sdivz, tdivz, zi, z, du, dv, spancountminus1;
float sdivz8stepu, tdivz8stepu, zi8stepu;
byte btemp;
short *pz;
sstep = 0; // keep compiler happy
tstep = 0; // ditto
pbase = (byte *) sw32_cacheblock;
sdivz8stepu = sw32_d_sdivzstepu * 8;
tdivz8stepu = sw32_d_tdivzstepu * 8;
zi8stepu = d_zistepu * 8 * 65536.0f;
// we count on FP exceptions being turned off to avoid range problems
izistep = (int) (d_zistepu * 0x8000 * 0x10000);
do {
pdest = (byte *) sw32_d_viewbuffer + sw32_screenwidth * pspan->v + pspan->u;
pz = sw32_d_pzbuffer + (sw32_d_zwidth * pspan->v) + pspan->u;
count = pspan->count;
if (count <= 0)
goto NextSpan1;
// calculate the initial s/z, t/z, 1/z, s, and t and clamp
du = (float) pspan->u;
dv = (float) pspan->v;
sdivz = sw32_d_sdivzorigin + dv * sw32_d_sdivzstepv + du * sw32_d_sdivzstepu;
tdivz = sw32_d_tdivzorigin + dv * sw32_d_tdivzstepv + du * sw32_d_tdivzstepu;
zi = (d_ziorigin + dv * d_zistepv + du * d_zistepu) * 65536.0f;
z = sw32_d_zitable[(int) zi];
// we count on FP exceptions being turned off to avoid range
// problems
izi = (int) (zi * 0x8000);
s = (int) (sdivz * z) + sw32_sadjust;
if (s > sw32_bbextents)
s = sw32_bbextents;
else if (s < 0)
s = 0;
t = (int) (tdivz * z) + sw32_tadjust;
if (t > sw32_bbextentt)
t = sw32_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 = sw32_d_zitable[(int) zi];
snext = (int) (sdivz * z) + sw32_sadjust;
if (snext > sw32_bbextents)
snext = sw32_bbextents;
else if (snext < 8)
snext = 8; // prevent round-off error on <0
// steps from causing overstepping
// & running off the texture's edge
tnext = (int) (tdivz * z) + sw32_tadjust;
if (tnext > sw32_bbextentt)
tnext = sw32_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 += sw32_d_sdivzstepu * spancountminus1;
tdivz += sw32_d_tdivzstepu * spancountminus1;
zi += d_zistepu * 65536.0f * spancountminus1;
z = sw32_d_zitable[(int) zi];
snext = (int) (sdivz * z) + sw32_sadjust;
if (snext > sw32_bbextents)
snext = sw32_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) + sw32_tadjust;
if (tnext > sw32_bbextentt)
tnext = sw32_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 {
btemp = pbase[(s >> 16) + (t >> 16) * sw32_cachewidth];
if (btemp != TRANSPARENT_COLOR) {
if (*pz <= (izi >> 16)) {
*pz = izi >> 16;
*pdest = btemp;
}
}
izi += izistep;
pdest++;
pz++;
s += sstep;
t += tstep;
} while (--spancount > 0);
s = snext;
t = tnext;
} while (count > 0);
NextSpan1:
pspan++;
} while (pspan->count != DS_SPAN_LIST_END);
}
break;
case 2:
{
int count, spancount, izistep;
int izi;
byte *pbase;
short *pdest;
fixed16_t s, t, snext, tnext, sstep, tstep;
float sdivz, tdivz, zi, z, du, dv, spancountminus1;
float sdivz8stepu, tdivz8stepu, zi8stepu;
byte btemp;
short *pz;
sstep = 0; // keep compiler happy
tstep = 0; // ditto
pbase = (byte *) sw32_cacheblock;
sdivz8stepu = sw32_d_sdivzstepu * 8;
tdivz8stepu = sw32_d_tdivzstepu * 8;
zi8stepu = d_zistepu * 8 * 65536;
// we count on FP exceptions being turned off to avoid range problems
izistep = (int) (d_zistepu * 0x8000 * 0x10000);
do {
pdest = (short *) sw32_d_viewbuffer + sw32_screenwidth * pspan->v + pspan->u;
pz = sw32_d_pzbuffer + (sw32_d_zwidth * pspan->v) + pspan->u;
count = pspan->count;
if (count <= 0)
goto NextSpan2;
// calculate the initial s/z, t/z, 1/z, s, and t and clamp
du = (float) pspan->u;
dv = (float) pspan->v;
sdivz = sw32_d_sdivzorigin + dv * sw32_d_sdivzstepv + du * sw32_d_sdivzstepu;
tdivz = sw32_d_tdivzorigin + dv * sw32_d_tdivzstepv + du * sw32_d_tdivzstepu;
zi = (d_ziorigin + dv * d_zistepv + du * d_zistepu) * 65536.0f;
z = sw32_d_zitable[(int) zi];
// we count on FP exceptions being turned off to avoid range
// problems
izi = (int) (zi * 0x8000);
s = (int) (sdivz * z) + sw32_sadjust;
if (s > sw32_bbextents)
s = sw32_bbextents;
else if (s < 0)
s = 0;
t = (int) (tdivz * z) + sw32_tadjust;
if (t > sw32_bbextentt)
t = sw32_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 = sw32_d_zitable[(int) zi];
snext = (int) (sdivz * z) + sw32_sadjust;
if (snext > sw32_bbextents)
snext = sw32_bbextents;
else if (snext < 8)
snext = 8; // prevent round-off error on <0
// steps from causing overstepping
// & running off the texture's edge
tnext = (int) (tdivz * z) + sw32_tadjust;
if (tnext > sw32_bbextentt)
tnext = sw32_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 += sw32_d_sdivzstepu * spancountminus1;
tdivz += sw32_d_tdivzstepu * spancountminus1;
zi += d_zistepu * 65536.0f * spancountminus1;
z = sw32_d_zitable[(int) zi];
snext = (int) (sdivz * z) + sw32_sadjust;
if (snext > sw32_bbextents)
snext = sw32_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) + sw32_tadjust;
if (tnext > sw32_bbextentt)
tnext = sw32_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 {
btemp = pbase[(s >> 16) + (t >> 16) * sw32_cachewidth];
if (btemp != TRANSPARENT_COLOR) {
if (*pz <= (izi >> 16)) {
*pz = izi >> 16;
*pdest = sw32_8to16table[btemp];
}
}
izi += izistep;
pdest++;
pz++;
s += sstep;
t += tstep;
} while (--spancount > 0);
s = snext;
t = tnext;
} while (count > 0);
NextSpan2:
pspan++;
} while (pspan->count != DS_SPAN_LIST_END);
}
break;
case 4:
{
int count, spancount, izistep;
int izi;
byte *pbase;
int *pdest;
fixed16_t s, t, snext, tnext, sstep, tstep;
float sdivz, tdivz, zi, z, du, dv, spancountminus1;
float sdivz8stepu, tdivz8stepu, zi8stepu;
byte btemp;
short *pz;
sstep = 0; // keep compiler happy
tstep = 0; // ditto
pbase = (byte *) sw32_cacheblock;
sdivz8stepu = sw32_d_sdivzstepu * 8;
tdivz8stepu = sw32_d_tdivzstepu * 8;
zi8stepu = d_zistepu * 8 * 65536;
// we count on FP exceptions being turned off to avoid range problems
izistep = (int) (d_zistepu * 0x8000 * 0x10000);
do {
pdest = (int *) sw32_d_viewbuffer + sw32_screenwidth * pspan->v + pspan->u;
pz = sw32_d_pzbuffer + (sw32_d_zwidth * pspan->v) + pspan->u;
count = pspan->count;
if (count <= 0)
goto NextSpan4;
// calculate the initial s/z, t/z, 1/z, s, and t and clamp
du = (float) pspan->u;
dv = (float) pspan->v;
sdivz = sw32_d_sdivzorigin + dv * sw32_d_sdivzstepv + du * sw32_d_sdivzstepu;
tdivz = sw32_d_tdivzorigin + dv * sw32_d_tdivzstepv + du * sw32_d_tdivzstepu;
zi = (d_ziorigin + dv * d_zistepv + du * d_zistepu) * 65536.0f;
z = sw32_d_zitable[(int) zi];
// we count on FP exceptions being turned off to avoid range
// problems
izi = (int) (zi * 0x8000);
s = (int) (sdivz * z) + sw32_sadjust;
if (s > sw32_bbextents)
s = sw32_bbextents;
else if (s < 0)
s = 0;
t = (int) (tdivz * z) + sw32_tadjust;
if (t > sw32_bbextentt)
t = sw32_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 = sw32_d_zitable[(int) zi];
snext = (int) (sdivz * z) + sw32_sadjust;
if (snext > sw32_bbextents)
snext = sw32_bbextents;
else if (snext < 8)
snext = 8; // prevent round-off error on <0
// steps from causing overstepping
// & running off the texture's edge
tnext = (int) (tdivz * z) + sw32_tadjust;
if (tnext > sw32_bbextentt)
tnext = sw32_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 += sw32_d_sdivzstepu * spancountminus1;
tdivz += sw32_d_tdivzstepu * spancountminus1;
zi += d_zistepu * 65536.0f * spancountminus1;
z = sw32_d_zitable[(int) zi];
snext = (int) (sdivz * z) + sw32_sadjust;
if (snext > sw32_bbextents)
snext = sw32_bbextents;
else if (snext < 8)
snext = 8; // prevent round-off error on <0
// steps fromcausing overstepping
// & running off the texture's edge
tnext = (int) (tdivz * z) + sw32_tadjust;
if (tnext > sw32_bbextentt)
tnext = sw32_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 {
btemp = pbase[(s >> 16) + (t >> 16) * sw32_cachewidth];
if (btemp != TRANSPARENT_COLOR) {
if (*pz <= (izi >> 16)) {
*pz = izi >> 16;
*pdest = d_8to24table[btemp];
}
}
izi += izistep;
pdest++;
pz++;
s += sstep;
t += tstep;
} while (--spancount > 0);
s = snext;
t = tnext;
} while (count > 0);
NextSpan4:
pspan++;
} while (pspan->count != DS_SPAN_LIST_END);
}
break;
default:
Sys_Error("D_SpriteDrawSpans: unsupported r_pixbytes %i",
sw32_r_pixbytes);
}
}
static void
D_SpriteScanLeftEdge (void)
{
int i, v, itop, ibottom, lmaxindex;
emitpoint_t *pvert, *pnext;
sspan_t *pspan;
float du, dv, vtop, vbottom, slope;
fixed16_t u, u_step;
pspan = sprite_spans;
i = minindex;
if (i == 0)
i = sw32_r_spritedesc.nump;
lmaxindex = maxindex;
if (lmaxindex == 0)
lmaxindex = sw32_r_spritedesc.nump;
vtop = ceil (sw32_r_spritedesc.pverts[i].v);
do {
pvert = &sw32_r_spritedesc.pverts[i];
pnext = pvert - 1;
vbottom = ceil (pnext->v);
if (vtop < vbottom) {
du = pnext->u - pvert->u;
dv = pnext->v - pvert->v;
slope = du / dv;
u_step = (int) (slope * 0x10000);
// adjust u to ceil the integer portion
u = (int) ((pvert->u + (slope * (vtop - pvert->v))) * 0x10000) +
(0x10000 - 1);
itop = (int) vtop;
ibottom = (int) vbottom;
for (v = itop; v < ibottom; v++) {
pspan->u = u >> 16;
pspan->v = v;
u += u_step;
pspan++;
}
}
vtop = vbottom;
i--;
if (i == 0)
i = sw32_r_spritedesc.nump;
} while (i != lmaxindex);
}
static void
D_SpriteScanRightEdge (void)
{
int i, v, itop, ibottom;
emitpoint_t *pvert, *pnext;
sspan_t *pspan;
float du, dv, vtop, vbottom, slope, uvert, unext, vvert, vnext;
fixed16_t u, u_step;
pspan = sprite_spans;
i = minindex;
vvert = sw32_r_spritedesc.pverts[i].v;
if (vvert < r_refdef.fvrecty_adj)
vvert = r_refdef.fvrecty_adj;
if (vvert > r_refdef.fvrectbottom_adj)
vvert = r_refdef.fvrectbottom_adj;
vtop = ceil (vvert);
do {
pvert = &sw32_r_spritedesc.pverts[i];
pnext = pvert + 1;
vnext = pnext->v;
if (vnext < r_refdef.fvrecty_adj)
vnext = r_refdef.fvrecty_adj;
if (vnext > r_refdef.fvrectbottom_adj)
vnext = r_refdef.fvrectbottom_adj;
vbottom = ceil (vnext);
if (vtop < vbottom) {
uvert = pvert->u;
if (uvert < r_refdef.fvrectx_adj)
uvert = r_refdef.fvrectx_adj;
if (uvert > r_refdef.fvrectright_adj)
uvert = r_refdef.fvrectright_adj;
unext = pnext->u;
if (unext < r_refdef.fvrectx_adj)
unext = r_refdef.fvrectx_adj;
if (unext > r_refdef.fvrectright_adj)
unext = r_refdef.fvrectright_adj;
du = unext - uvert;
dv = vnext - vvert;
slope = du / dv;
u_step = (int) (slope * 0x10000);
// adjust u to ceil the integer portion
u = (int) ((uvert + (slope * (vtop - vvert))) * 0x10000) +
(0x10000 - 1);
itop = (int) vtop;
ibottom = (int) vbottom;
for (v = itop; v < ibottom; v++) {
pspan->count = (u >> 16) - pspan->u;
u += u_step;
pspan++;
}
}
vtop = vbottom;
vvert = vnext;
i++;
if (i == sw32_r_spritedesc.nump)
i = 0;
} while (i != maxindex);
pspan->count = DS_SPAN_LIST_END; // mark the end of the span list
}
static void
D_SpriteCalculateGradients (void)
{
vec3_t p_normal, p_saxis, p_taxis, p_temp1;
float distinv;
sw32_TransformVector (sw32_r_spritedesc.vpn, p_normal);
sw32_TransformVector (sw32_r_spritedesc.vright, p_saxis);
sw32_TransformVector (sw32_r_spritedesc.vup, p_taxis);
VectorNegate (p_taxis, p_taxis);
distinv = 1.0 / (-DotProduct (modelorg, sw32_r_spritedesc.vpn));
distinv = min (distinv, 1.0);
sw32_d_sdivzstepu = p_saxis[0] * sw32_xscaleinv;
sw32_d_tdivzstepu = p_taxis[0] * sw32_xscaleinv;
sw32_d_sdivzstepv = -p_saxis[1] * sw32_yscaleinv;
sw32_d_tdivzstepv = -p_taxis[1] * sw32_yscaleinv;
d_zistepu = p_normal[0] * sw32_xscaleinv * distinv;
d_zistepv = -p_normal[1] * sw32_yscaleinv * distinv;
sw32_d_sdivzorigin = p_saxis[2] - sw32_xcenter * sw32_d_sdivzstepu -
sw32_ycenter * sw32_d_sdivzstepv;
sw32_d_tdivzorigin = p_taxis[2] - sw32_xcenter * sw32_d_tdivzstepu -
sw32_ycenter * sw32_d_tdivzstepv;
d_ziorigin = p_normal[2] * distinv - sw32_xcenter * d_zistepu -
sw32_ycenter * d_zistepv;
sw32_TransformVector (modelorg, p_temp1);
sw32_sadjust = ((fixed16_t) (DotProduct (p_temp1, p_saxis) * 0x10000 + 0.5)) -
(-(sw32_cachewidth >> 1) << 16);
sw32_tadjust = ((fixed16_t) (DotProduct (p_temp1, p_taxis) * 0x10000 + 0.5)) -
(-(sprite_height >> 1) << 16);
// -1 (-epsilon) so we never wander off the edge of the texture
sw32_bbextents = (sw32_cachewidth << 16) - 1;
sw32_bbextentt = (sprite_height << 16) - 1;
}
void
sw32_D_DrawSprite (void)
{
int i, nump;
float ymin, ymax;
emitpoint_t *pverts;
sspan_t spans[MAXHEIGHT + 1];
sprite_spans = spans;
// find the top and bottom vertices, and make sure there's at least one
// scan to draw
ymin = 999999.9;
ymax = -999999.9;
pverts = sw32_r_spritedesc.pverts;
for (i = 0; i < sw32_r_spritedesc.nump; i++) {
if (pverts->v < ymin) {
ymin = pverts->v;
minindex = i;
}
if (pverts->v > ymax) {
ymax = pverts->v;
maxindex = i;
}
pverts++;
}
ymin = ceil (ymin);
ymax = ceil (ymax);
if (ymin >= ymax)
return; // doesn't cross any scans at all
sw32_cachewidth = sw32_r_spritedesc.pspriteframe->width;
sprite_height = sw32_r_spritedesc.pspriteframe->height;
sw32_cacheblock = &sw32_r_spritedesc.pspriteframe->pixels[0];
// copy the first vertex to the last vertex, so we don't have to deal with
// wrapping
nump = sw32_r_spritedesc.nump;
pverts = sw32_r_spritedesc.pverts;
pverts[nump] = pverts[0];
D_SpriteCalculateGradients ();
D_SpriteScanLeftEdge ();
D_SpriteScanRightEdge ();
sw32_D_SpriteDrawSpans (sprite_spans);
}
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