quakeforge/libs/video/renderer/sw/d_part.c

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/*
d_part.c
software driver module for drawing particles
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
*/
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static const char rcsid[] =
"$Id$";
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "d_local.h"
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#include "r_local.h"
void
D_EndParticles (void)
{
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// not used by software driver
}
void
D_StartParticles (void)
{
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// not used by software driver
}
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#ifdef PIC
#undef USE_INTEL_ASM //XXX asm pic hack
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#endif
#ifndef USE_INTEL_ASM
void
D_DrawParticle (particle_t *pparticle)
{
vec3_t local, transformed;
float zi;
byte *pdest;
short *pz;
int i, izi, pix, count, u, v;
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// transform point
VectorSubtract (pparticle->org, r_origin, local);
transformed[0] = DotProduct (local, r_pright);
transformed[1] = DotProduct (local, r_pup);
transformed[2] = DotProduct (local, r_ppn);
if (transformed[2] < PARTICLE_Z_CLIP)
return;
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// project the point
// FIXME: preadjust xcenter and ycenter
zi = 1.0 / transformed[2];
u = (int) (xcenter + zi * transformed[0] + 0.5);
v = (int) (ycenter - zi * transformed[1] + 0.5);
if ((v > d_vrectbottom_particle) ||
(u > d_vrectright_particle) || (v < d_vrecty) || (u < d_vrectx)) {
return;
}
pz = d_pzbuffer + (d_zwidth * v) + u;
pdest = d_viewbuffer + d_scantable[v] + u;
izi = (int) (zi * 0x8000);
pix = izi >> d_pix_shift;
if (pix < d_pix_min)
pix = d_pix_min;
else if (pix > d_pix_max)
pix = d_pix_max;
switch (pix) {
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case 1:
count = 1 << d_y_aspect_shift;
for (; count; count--, pz += d_zwidth, pdest += screenwidth) {
if (pz[0] <= izi) {
pz[0] = izi;
pdest[0] = pparticle->color;
}
}
break;
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case 2:
count = 2 << d_y_aspect_shift;
for (; count; count--, pz += d_zwidth, pdest += screenwidth) {
if (pz[0] <= izi) {
pz[0] = izi;
pdest[0] = pparticle->color;
}
if (pz[1] <= izi) {
pz[1] = izi;
pdest[1] = pparticle->color;
}
}
break;
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case 3:
count = 3 << d_y_aspect_shift;
for (; count; count--, pz += d_zwidth, pdest += screenwidth) {
if (pz[0] <= izi) {
pz[0] = izi;
pdest[0] = pparticle->color;
}
if (pz[1] <= izi) {
pz[1] = izi;
pdest[1] = pparticle->color;
}
if (pz[2] <= izi) {
pz[2] = izi;
pdest[2] = pparticle->color;
}
}
break;
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case 4:
count = 4 << d_y_aspect_shift;
for (; count; count--, pz += d_zwidth, pdest += screenwidth) {
if (pz[0] <= izi) {
pz[0] = izi;
pdest[0] = pparticle->color;
}
if (pz[1] <= izi) {
pz[1] = izi;
pdest[1] = pparticle->color;
}
if (pz[2] <= izi) {
pz[2] = izi;
pdest[2] = pparticle->color;
}
if (pz[3] <= izi) {
pz[3] = izi;
pdest[3] = pparticle->color;
}
}
break;
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default:
count = pix << d_y_aspect_shift;
for (; count; count--, pz += d_zwidth, pdest += screenwidth) {
for (i = 0; i < pix; i++) {
if (pz[i] <= izi) {
pz[i] = izi;
pdest[i] = pparticle->color;
}
}
}
break;
}
}
#endif // !USE_INTEL_ASM