/*
	r_part.c

	@description@

	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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include "QF/qargs.h"
#include "QF/console.h"
#include "QF/render.h"

#include "compat.h"
#include "r_local.h"

particle_t *active_particles, *free_particles;

particle_t *particles;
int         r_numparticles;

vec3_t      r_pright, r_pup, r_ppn;


#ifdef QUAKE2
void
R_DarkFieldParticles (entity_t *ent)
{
	int         i, j, k;
	particle_t *p;
	float       vel;
	vec3_t      dir;
	vec3_t      org;

	org[0] = ent->origin[0];
	org[1] = ent->origin[1];
	org[2] = ent->origin[2];
	for (i = -16; i < 16; i += 8)
		for (j = -16; j < 16; j += 8)
			for (k = 0; k < 32; k += 8) {
				if (!free_particles)
					return;
				p = free_particles;
				free_particles = p->next;
				p->next = active_particles;
				active_particles = p;

				p->die = r_realtime + 0.2 + (rand () & 7) * 0.02;
				p->color = 150 + rand () % 6;
				p->type = pt_slowgrav;

				dir[0] = j * 8;
				dir[1] = i * 8;
				dir[2] = k * 8;

				p->org[0] = org[0] + i + (rand () & 3);
				p->org[1] = org[1] + j + (rand () & 3);
				p->org[2] = org[2] + k + (rand () & 3);

				VectorNormalize (dir);
				vel = 50 + (rand () & 63);
				VectorScale (dir, vel, p->vel);
			}
}
#endif

#define NUMVERTEXNORMALS	162
extern float r_avertexnormals[NUMVERTEXNORMALS][3];
static vec3_t      avelocities[NUMVERTEXNORMALS];
static float       beamlength = 16;

void
R_EntityParticles (entity_t *ent)
{
	int         count;
	int         i;
	particle_t *p;
	float       angle;
	float       sr, sp, sy, cr, cp, cy;
	vec3_t      forward;
	float       dist;

	dist = 64;
	count = 50;

	if (!avelocities[0][0]) {
		for (i = 0; i < NUMVERTEXNORMALS * 3; i++)
			avelocities[0][i] = (rand () & 255) * 0.01;
	}

	for (i = 0; i < NUMVERTEXNORMALS; i++) {
		angle = r_realtime * avelocities[i][0];
		sy = sin (angle);
		cy = cos (angle);
		angle = r_realtime * avelocities[i][1];
		sp = sin (angle);
		cp = cos (angle);
		angle = r_realtime * avelocities[i][2];
		sr = sin (angle);
		cr = cos (angle);

		forward[0] = cp * cy;
		forward[1] = cp * sy;
		forward[2] = -sp;

		if (!free_particles)
			return;
		p = free_particles;
		free_particles = p->next;
		p->next = active_particles;
		active_particles = p;

		p->die = r_realtime + 0.01;
		p->color = 0x6f;
		p->type = pt_explode;

		p->org[0] =
			ent->origin[0] + r_avertexnormals[i][0] * dist +
			forward[0] * beamlength;
		p->org[1] =
			ent->origin[1] + r_avertexnormals[i][1] * dist +
			forward[1] * beamlength;
		p->org[2] =
			ent->origin[2] + r_avertexnormals[i][2] * dist +
			forward[2] * beamlength;
	}
}