119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
/*
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r_part.c
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Interface for 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 "QF/cvar.h"
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#include "QF/qargs.h"
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#include "QF/render.h"
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#include "QF/sys.h"
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#include "compat.h"
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#include "r_internal.h"
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psystem_t r_psystem; //FIXME singleton
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/*
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R_MaxParticlesCheck
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Misty-chan: Dynamically change the maximum amount of particles on the fly.
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Thanks to a LOT of help from Taniwha, Deek, Mercury, Lordhavoc, and lots of
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others.
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*/
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void
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R_MaxParticlesCheck (cvar_t *r_particles, cvar_t *r_particles_max)
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{
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psystem_t *ps = &r_psystem;//FIXME
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unsigned maxparticles = 0;
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if (r_particles && r_particles->int_val) {
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maxparticles = r_particles_max ? r_particles_max->int_val : 0;
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}
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if (ps->maxparticles == maxparticles) {
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return;
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}
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size_t size = sizeof (particle_t) + sizeof (partparm_t)
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+ sizeof (int *);
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if (ps->particles) {
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Sys_Free (ps->particles, ps->maxparticles * size);
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ps->particles = 0;
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ps->partparams = 0;
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ps->partramps = 0;
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}
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ps->maxparticles = maxparticles;
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if (ps->maxparticles) {
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ps->particles = Sys_Alloc (ps->maxparticles * size);
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ps->partparams = (partparm_t *) &ps->particles[ps->maxparticles];
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ps->partramps = (const int **) &ps->partparams[ps->maxparticles];
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}
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R_ClearParticles ();
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}
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void
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R_ClearParticles (void)
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{
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psystem_t *ps = &r_psystem;//FIXME
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ps->numparticles = 0;
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}
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void
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R_RunParticles (float dT)
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{
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psystem_t *ps = &r_psystem;//FIXME
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vec4f_t gravity = ps->gravity;
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unsigned j = 0;
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for (unsigned i = 0; i < ps->numparticles; i++) {
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particle_t *p = &ps->particles[i];
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partparm_t *parm = &ps->partparams[i];
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if (p->live <= 0 || p->ramp >= parm->ramp_max) {
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continue;
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}
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const int *ramp = ps->partramps[i];
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if (i > j) {
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ps->particles[j] = *p;
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ps->partparams[j] = *parm;
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ps->partramps[j] = ramp;
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}
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j += 1;
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p->pos += dT * p->vel;
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p->vel += dT * (p->vel * parm->drag + gravity * parm->drag[3]);
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p->ramp += dT * parm->ramp;
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p->live -= dT;
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if (ramp) {
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p->icolor = ramp[(int)p->ramp];
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}
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}
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ps->numparticles = j;
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}
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