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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"
-
-
- /*
- ==============
- 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;
- byte *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;
-
- 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
-
-