fteqw/engine/sw/d_part.c

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/*
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_part.c: software driver module for drawing particles
#include "quakedef.h"
#include "d_local.h"
//Spike: Particles are depth sorted. So why depth write? They are the last to be drawn anyway.
/*
==============
D_EndParticles
==============
*/
void D_EndParticles (void)
{
// not used by software driver
}
/*
==============
D_StartParticles
==============
*/
void D_StartParticles (void)
{
// not used by software driver
}
#if !id386
/*
==============
D_DrawParticle
==============
*/
void D_DrawParticle (particle_t *pparticle)
{
vec3_t local, transformed;
float zi;
qbyte *pdest;
short *pz;
int i, izi, pix, count, u, v;
// 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;
// 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;
pix *= pparticle->scale;
if (pix < d_pix_min)
pix = d_pix_min;
else if (pix > d_pix_max)
pix = d_pix_max;
switch (pix)
{
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;
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;
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;
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;
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 // !id386
void D_DrawParticle16 (particle_t *pparticle)
{
vec3_t local, transformed;
float zi;
unsigned short *pdest;
int a;
short *pz;
int i, izi, pix, count, u, v;
if (pparticle->alpha <= 0.2)
return;
// 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;
// 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;
izi = (int)(zi * 0x8000);
pix = ((int)(izi*pparticle->scale)) >> d_pix_shift;
if (pix < d_pix_min)
pix = d_pix_min;
else if (pix > d_pix_max)
pix = d_pix_max;
u -= pix/2;
v -= pix/2;
if (u < 0) u = 0;
if (v < 0) v = 0;
pdest = (unsigned short *)d_viewbuffer + ((d_scantable[v] + u));
a = 255*pparticle->alpha;
switch (pix)
{
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] = d_8to16table[(int)pparticle->color];
}
}
}
break;
}
}
void D_DrawParticle32 (particle_t *pparticle)
{
vec3_t local, transformed;
float zi;
qbyte *pdest;
qbyte *pal;
int a;
short *pz;
int i, izi, pix, count, u, v;
if (pparticle->alpha <= 0.0)
return;
// 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;
// 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;
izi = (int)(zi * 0x8000);
pix = ((int)(izi*pparticle->scale)) >> d_pix_shift;
if (pix < d_pix_min)
pix = d_pix_min;
else if (pix > d_pix_max)
pix = d_pix_max;
u -= pix/2;
v -= pix/2;
if (u < 0) u = 0;
if (v < 0) v = 0;
pdest = d_viewbuffer + ((d_scantable[v] + u)<<2);
pal = (qbyte *)&d_8to32table[(int)pparticle->color];
a = 255*pparticle->alpha;
switch (pix)
{
default:
count = pix << d_y_aspect_shift;
for ( ; count ; count--, pz += d_zwidth, pdest += screenwidth<<2)
{
for (i=0 ; i<pix ; i++)
{
if (pz[i] <= izi)
{
// pz[i] = izi;
pdest[(i<<2)+0] = (pdest[(i<<2)+0]*(255-a) + pal[0]*a) / 255;
pdest[(i<<2)+1] = (pdest[(i<<2)+1]*(255-a) + pal[1]*a) / 255;
pdest[(i<<2)+2] = (pdest[(i<<2)+2]*(255-a) + pal[2]*a) / 255;
}
}
}
break;
}
}
#define draw(x, y) x=Trans(x,(int)y)
#define rdraw(x, y) x=Trans((int)y,x)
void D_DrawParticleReverseTrans (particle_t *pparticle)
{
vec3_t local, transformed;
float zi;
qbyte *pdest;
short *pz;
int i, izi, pix, count, u, v;
// 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;
// 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;
izi = (int)(zi * 0x8000);
pix = ((int)(izi*pparticle->scale)) >> d_pix_shift;
if (pix < d_pix_min)
pix = d_pix_min;
else if (pix > d_pix_max)
pix = d_pix_max;
u -= pix/2;
v -= pix/2;
if (u < 0) u = 0;
if (v < 0) v = 0;
pdest = d_viewbuffer + d_scantable[v] + u;
switch (pix)
{
case 1:
count = 1 << d_y_aspect_shift;
for ( ; count ; count--, pz += d_zwidth, pdest += screenwidth)
{
if (pz[0] <= izi)
{
// pz[0] = izi;
rdraw(pdest[0], pparticle->color);
}
}
break;
case 2:
count = 2 << d_y_aspect_shift;
for ( ; count ; count--, pz += d_zwidth, pdest += screenwidth)
{
if (pz[0] <= izi)
{
// pz[0] = izi;
rdraw(pdest[0], pparticle->color);
}
if (pz[1] <= izi)
{
// pz[1] = izi;
rdraw(pdest[1], pparticle->color);
}
}
break;
case 3:
count = 3 << d_y_aspect_shift;
for ( ; count ; count--, pz += d_zwidth, pdest += screenwidth)
{
if (pz[0] <= izi)
{
// pz[0] = izi;
rdraw(pdest[0], pparticle->color);
}
if (pz[1] <= izi)
{
// pz[1] = izi;
rdraw(pdest[1], pparticle->color);
}
if (pz[2] <= izi)
{
// pz[2] = izi;
rdraw(pdest[2], pparticle->color);
}
}
break;
case 4:
count = 4 << d_y_aspect_shift;
for ( ; count ; count--, pz += d_zwidth, pdest += screenwidth)
{
if (pz[0] <= izi)
{
// pz[0] = izi;
rdraw(pdest[0], pparticle->color);
}
if (pz[1] <= izi)
{
// pz[1] = izi;
rdraw(pdest[1], pparticle->color);
}
if (pz[2] <= izi)
{
// pz[2] = izi;
rdraw(pdest[2], pparticle->color);
}
if (pz[3] <= izi)
{
// pz[3] = izi;
rdraw(pdest[3], pparticle->color);
}
}
break;
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;
rdraw(pdest[i], pparticle->color);
}
}
}
break;
}
}
void D_DrawParticleTrans (particle_t *pparticle)
{
vec3_t local, transformed;
float zi;
qbyte *pdest;
short *pz;
int i, izi, pix, count, u, v;
if (r_pixbytes == 4)
{
D_DrawParticle32(pparticle);
return;
}
if (r_pixbytes == 2)
{
D_DrawParticle16(pparticle);
return;
}
Set_TransLevelF(pparticle->alpha);
if (t_state & TT_ZERO)
return;
if (t_state & TT_ONE)
{
D_DrawParticle(pparticle);
return;
}
if (t_state & TT_REVERSE)
{
D_DrawParticleReverseTrans(pparticle);
return;
}
// 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;
// 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;
izi = (int)(zi * 0x8000);
pix = ((int)(izi*pparticle->scale)) >> d_pix_shift;
if (pix < d_pix_min)
pix = d_pix_min;
else if (pix > d_pix_max)
pix = d_pix_max;
u -= pix/2;
v -= pix/2;
if (u < 0) u = 0;
if (v < 0) v = 0;
pdest = d_viewbuffer + d_scantable[v] + u;
switch (pix)
{
case 1:
count = 1 << d_y_aspect_shift;
for ( ; count ; count--, pz += d_zwidth, pdest += screenwidth)
{
if (pz[0] <= izi)
{
// pz[0] = izi;
draw(pdest[0], pparticle->color);
}
}
break;
case 2:
count = 2 << d_y_aspect_shift;
for ( ; count ; count--, pz += d_zwidth, pdest += screenwidth)
{
if (pz[0] <= izi)
{
// pz[0] = izi;
draw(pdest[0], pparticle->color);
}
if (pz[1] <= izi)
{
// pz[1] = izi;
draw(pdest[1], pparticle->color);
}
}
break;
case 3:
count = 3 << d_y_aspect_shift;
for ( ; count ; count--, pz += d_zwidth, pdest += screenwidth)
{
if (pz[0] <= izi)
{
// pz[0] = izi;
draw(pdest[0], pparticle->color);
}
if (pz[1] <= izi)
{
// pz[1] = izi;
draw(pdest[1], pparticle->color);
}
if (pz[2] <= izi)
{
// pz[2] = izi;
draw(pdest[2], pparticle->color);
}
}
break;
case 4:
count = 4 << d_y_aspect_shift;
for ( ; count ; count--, pz += d_zwidth, pdest += screenwidth)
{
if (pz[0] <= izi)
{
// pz[0] = izi;
draw(pdest[0], pparticle->color);
}
if (pz[1] <= izi)
{
// pz[1] = izi;
draw(pdest[1], pparticle->color);
}
if (pz[2] <= izi)
{
// pz[2] = izi;
draw(pdest[2], pparticle->color);
}
if (pz[3] <= izi)
{
// pz[3] = izi;
draw(pdest[3], pparticle->color);
}
}
break;
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;
draw(pdest[i], pparticle->color);
}
}
}
break;
}
}
void D_2dPos(vec3_t pos, int *u, int *v, int *z)
{
float zi;
vec3_t local, transformed;
// transform point
VectorSubtract (pos, r_origin, local);
transformed[2] = DotProduct(local, r_ppn);
if (transformed[2] < PARTICLE_Z_CLIP) //near clip
{
*u = -1; //send it off the side intentionally.
return;
}
transformed[0] = DotProduct(local, r_pright);
transformed[1] = DotProduct(local, r_pup);
// project the point
zi = 1.0 / transformed[2];
*u = (int)(xcenter + zi * transformed[0] + 0.5);
*v = (int)(ycenter - zi * transformed[1] + 0.5);
*z = (int)(zi * 0x8000);
}
vec_t VI2Length(int x, int y)
{
float length;
length = (float)x*x + (float)y*y;
length = sqrt (length);
return length;
}
void D_DrawSparkTrans32 (particle_t *pparticle) //draw a line in 3d space
{
/*
Finds 2d coords for the points, then draws a line between them with an appropriate alpha
*/
vec3_t delta;
unsigned char *pdest;
unsigned char *pal;
short *pz;
int count, u1, v1, z1, a1, a, ia;
int u2, v2, z2;
float speed;
int du, dv, dz, da;
if (pparticle->alpha <= 0.0)
return;
speed = Length(pparticle->u.p.vel);
if ((speed) < 1)
{
D_2dPos(pparticle->org, &u1, &v1, &z1);
D_2dPos(pparticle->org, &u2, &v2, &z2);
}
else
{ //causes flickers with lower vels (due to bouncing in physics)
if (speed < 50)
speed *= 50/speed;
VectorMA(pparticle->org, 5/(speed), pparticle->u.p.vel, delta);
D_2dPos(delta, &u1, &v1, &z1);
VectorMA(pparticle->org, -5/(speed), pparticle->u.p.vel, delta);
D_2dPos(delta, &u2, &v2, &z2);
}
if ((v1 > d_vrectbottom_particle) ||
(u1 > d_vrectright_particle) ||
(v1 < d_vrecty) ||
(u1 < d_vrectx))
{
return;
}
if ((v2 > d_vrectbottom_particle) ||
(u2 > d_vrectright_particle) ||
(v2 < d_vrecty) ||
(u2 < d_vrectx))
{
return;
}
pal = (qbyte *)(d_8to32table + (int)pparticle->color);
a1 = 255 * pparticle->alpha;
du = u2 - u1;
dv = v2 - v1;
dz = z2 - z1;
da = 0 - a1;
if (!du && !dv)
count = 1;
else
{
count = VI2Length(du, dv);
if (!count)
count = 1;
}
du *= 256*256;
dv *= 256*256;
dz *= 256*256;
da *= 256*256;
u1 = u1<<16;
v1 = v1<<16;
z1 = z1<<16;
a1 = a1<<16;
{
du /= count;
dv /= count;
dz /= count;
da /= count;
}
do
{
pz = d_pzbuffer + (d_zwidth * (v1>>16)) + (u1>>16);
if (*pz <= z1>>16)
{
// *pz = z1>>16;
a = a1>>16;
ia = 255-a;
pdest = (qbyte *)((unsigned int *)d_viewbuffer + ((d_scantable[v1>>16] + (u1>>16))));
pdest[0] = (pdest[0]*((ia)) + pal[0]*(a))/255;
pdest[1] = (pdest[1]*((ia)) + pal[1]*(a))/255;
pdest[2] = (pdest[2]*((ia)) + pal[2]*(a))/255;
}
u1 += du;
v1 += dv;
z1 += dz;
a1 += da;
} while (count--);
}
void D_DrawSparkTrans16 (particle_t *pparticle) //draw a line in 3d space, 8bpp
{
vec3_t delta;
unsigned short *pdest;
short *pz;
int count, u1, v1, z1;
int u2, v2, z2;
float speed;
int du, dv, dz;
if (pparticle->alpha <= 0.0)
return;
speed = Length(pparticle->u.p.vel);
if ((speed) < 1)
{
D_2dPos(pparticle->org, &u1, &v1, &z1);
D_2dPos(pparticle->org, &u2, &v2, &z2);
}
else
{ //causes flickers with lower vels (due to bouncing in physics)
if (speed < 50)
speed *= 50/speed;
VectorMA(pparticle->org, 2.5/(speed), pparticle->u.p.vel, delta);
D_2dPos(delta, &u1, &v1, &z1);
VectorMA(pparticle->org, -2.5/(speed), pparticle->u.p.vel, delta);
D_2dPos(delta, &u2, &v2, &z2);
}
if ((v1 > d_vrectbottom_particle) ||
(u1 > d_vrectright_particle) ||
(v1 < d_vrecty) ||
(u1 < d_vrectx))
{
return;
}
if ((v2 > d_vrectbottom_particle) ||
(u2 > d_vrectright_particle) ||
(v2 < d_vrecty) ||
(u2 < d_vrectx))
{
return;
}
du = u2 - u1;
dv = v2 - v1;
dz = z2 - z1;
if (!du && !dv)
count = 1;
else
{
count = VI2Length(du, dv);
if (!count)
count = 1;
}
du *= 256*256;
dv *= 256*256;
dz *= 256*256;
u1 = u1<<16;
v1 = v1<<16;
z1 = z1<<16;
{
du /= count;
dv /= count;
dz /= count;
}
do
{
pz = d_pzbuffer + (d_zwidth * (v1>>16)) + (u1>>16);
if (*pz <= z1>>16)
{
// *pz = z1>>16;
pdest = (unsigned short*)d_viewbuffer + d_scantable[v1>>16] + (u1>>16);
*pdest = d_8to16table[(int)pparticle->color];
}
u1 += du;
v1 += dv;
z1 += dz;
} while (count--);
}
void D_DrawSparkTrans (particle_t *pparticle) //draw a line in 3d space, 8bpp
{
vec3_t delta;
qbyte *pdest;
short *pz;
int count, u1, v1, z1;
int u2, v2, z2;
float speed;
int du, dv, dz;
/*
D_DrawParticleTrans(pparticle);
return;
*/
if (r_pixbytes == 4)
{
D_DrawSparkTrans32(pparticle);
return;
}
if (r_pixbytes == 2)
{
D_DrawSparkTrans16(pparticle);
return;
}
Set_TransLevelF(pparticle->alpha);
if (t_state & TT_ZERO)
return;
speed = Length(pparticle->u.p.vel);
if ((speed) < 1)
{
D_2dPos(pparticle->org, &u1, &v1, &z1);
D_2dPos(pparticle->org, &u2, &v2, &z2);
}
else
{ //causes flickers with lower vels (due to bouncing in physics)
if (speed < 50)
speed *= 50/speed;
VectorMA(pparticle->org, 2.5/(speed), pparticle->u.p.vel, delta);
D_2dPos(delta, &u1, &v1, &z1);
VectorMA(pparticle->org, -2.5/(speed), pparticle->u.p.vel, delta);
D_2dPos(delta, &u2, &v2, &z2);
}
if ((v1 > d_vrectbottom_particle) ||
(u1 > d_vrectright_particle) ||
(v1 < d_vrecty) ||
(u1 < d_vrectx))
{
return;
}
if ((v2 > d_vrectbottom_particle) ||
(u2 > d_vrectright_particle) ||
(v2 < d_vrecty) ||
(u2 < d_vrectx))
{
return;
}
du = u2 - u1;
dv = v2 - v1;
dz = z2 - z1;
if (!du && !dv)
count = 1;
else
{
count = VI2Length(du, dv);
if (!count)
count = 1;
}
du *= 256*256;
dv *= 256*256;
dz *= 256*256;
u1 = u1<<16;
v1 = v1<<16;
z1 = z1<<16;
{
du /= count;
dv /= count;
dz /= count;
}
if (t_state & TT_ONE)
{
do
{
pz = d_pzbuffer + (d_zwidth * (v1>>16)) + (u1>>16);
if (*pz <= z1>>16)
{
pdest = d_viewbuffer + d_scantable[v1>>16] + (u1>>16);
*pdest = pparticle->color;
}
u1 += du;
v1 += dv;
z1 += dz;
} while (count--);
}
else if (t_state & TT_REVERSE)
{
do
{
pz = d_pzbuffer + (d_zwidth * (v1>>16)) + (u1>>16);
if (*pz <= z1>>16)
{
pdest = d_viewbuffer + d_scantable[v1>>16] + (u1>>16);
rdraw(*pdest, pparticle->color);
}
u1 += du;
v1 += dv;
z1 += dz;
} while (count--);
}
else
{
do
{
pz = d_pzbuffer + (d_zwidth * (v1>>16)) + (u1>>16);
if (*pz <= z1>>16)
{
// *pz = z1>>16;
pdest = d_viewbuffer + d_scantable[v1>>16] + (u1>>16);
draw(*pdest, pparticle->color);
}
u1 += du;
v1 += dv;
z1 += dz;
} while (count--);
}
}