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https://git.code.sf.net/p/quake/quakeforge
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165 lines
3.4 KiB
C
165 lines
3.4 KiB
C
/*
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d_part.c
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software driver module for drawing particles
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "d_local.h"
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#include "r_internal.h"
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#ifdef PIC
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#undef USE_INTEL_ASM //XXX asm pic hack
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#endif
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#ifndef USE_INTEL_ASM
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void
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D_DrawParticle (particle_t *pparticle)
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{
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vec3_t local, transformed;
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float zi;
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byte *pdest;
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short *pz;
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int i, izi, pix, count, u, v;
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// transform point
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VectorSubtract (pparticle->pos, r_porigin, local);
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transformed[0] = DotProduct (local, r_pright);
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transformed[1] = DotProduct (local, r_pup);
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transformed[2] = DotProduct (local, r_ppn);
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if (transformed[2] < PARTICLE_Z_CLIP)
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return;
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// project the point
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// FIXME: preadjust xcenter and ycenter
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zi = 1.0 / transformed[2];
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u = (int) (xcenter + zi * transformed[0] + 0.5);
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v = (int) (ycenter - zi * transformed[1] + 0.5);
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if ((v > d_vrectbottom_particle) ||
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(u > d_vrectright_particle) || (v < d_vrecty) || (u < d_vrectx)) {
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return;
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}
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pz = d_zbuffer + (d_zwidth * v) + u;
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pdest = d_viewbuffer + d_scantable[v] + u;
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izi = (int) (zi * 0x8000);
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pix = izi >> d_pix_shift;
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if (pix < d_pix_min)
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pix = d_pix_min;
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else if (pix > d_pix_max)
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pix = d_pix_max;
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switch (pix) {
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case 1:
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count = 1 << d_y_aspect_shift;
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for (; count; count--, pz += d_zwidth, pdest += screenwidth) {
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if (pz[0] <= izi) {
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pz[0] = izi;
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pdest[0] = pparticle->icolor;
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}
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}
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break;
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case 2:
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count = 2 << d_y_aspect_shift;
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for (; count; count--, pz += d_zwidth, pdest += screenwidth) {
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if (pz[0] <= izi) {
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pz[0] = izi;
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pdest[0] = pparticle->icolor;
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}
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if (pz[1] <= izi) {
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pz[1] = izi;
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pdest[1] = pparticle->icolor;
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}
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}
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break;
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case 3:
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count = 3 << d_y_aspect_shift;
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for (; count; count--, pz += d_zwidth, pdest += screenwidth) {
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if (pz[0] <= izi) {
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pz[0] = izi;
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pdest[0] = pparticle->icolor;
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}
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if (pz[1] <= izi) {
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pz[1] = izi;
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pdest[1] = pparticle->icolor;
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}
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if (pz[2] <= izi) {
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pz[2] = izi;
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pdest[2] = pparticle->icolor;
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}
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}
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break;
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case 4:
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count = 4 << d_y_aspect_shift;
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for (; count; count--, pz += d_zwidth, pdest += screenwidth) {
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if (pz[0] <= izi) {
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pz[0] = izi;
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pdest[0] = pparticle->icolor;
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}
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if (pz[1] <= izi) {
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pz[1] = izi;
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pdest[1] = pparticle->icolor;
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}
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if (pz[2] <= izi) {
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pz[2] = izi;
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pdest[2] = pparticle->icolor;
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}
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if (pz[3] <= izi) {
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pz[3] = izi;
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pdest[3] = pparticle->icolor;
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}
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}
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break;
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default:
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count = pix << d_y_aspect_shift;
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for (; count; count--, pz += d_zwidth, pdest += screenwidth) {
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for (i = 0; i < pix; i++) {
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if (pz[i] <= izi) {
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pz[i] = izi;
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pdest[i] = pparticle->icolor;
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}
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}
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}
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break;
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}
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}
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#endif // !USE_INTEL_ASM
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