diff options
Diffstat (limited to 'apps/plugins/sdl/progs/quake/d_part.c')
| -rw-r--r-- | apps/plugins/sdl/progs/quake/d_part.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/apps/plugins/sdl/progs/quake/d_part.c b/apps/plugins/sdl/progs/quake/d_part.c new file mode 100644 index 0000000..176b76b --- /dev/null +++ b/apps/plugins/sdl/progs/quake/d_part.c @@ -0,0 +1,207 @@ +/* +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 + |