ref: 216c1ae66ef6967d1a470a431418241c001c708b
dir: /QW/client/d_part.c/
/* 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