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quakeforge/libs/video/renderer/sw32/d_sprite.c
Bill Currie a05210d864 [video] Get 16 and 32 bit sw32 mostly working in x11 
Lighting on alias models seems to be borked, and skies are borked in
both sw renderers (seems to be nothing to do with this commit, though).
2021-07-11 00:09:41 +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"
#include "vid_sw.h"
static int sprite_height;
static int minindex, maxindex;
static sspan_t *sprite_spans;
void
sw32_D_SpriteDrawSpans (sspan_t *pspan)
{
switch(sw32_ctx->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_ctx->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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