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/*

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.

*/

#include "quakedef.h"

#include "r_local.h"

#define MAX_PARTICLES			2048	// default max # of particles at one

										//  time

#define ABSOLUTE_MIN_PARTICLES	512		// no fewer than this no matter what's

										//  on the command line

int		ramp1[8] = {0x6f, 0x6d, 0x6b, 0x69, 0x67, 0x65, 0x63, 0x61};

int		ramp2[8] = {0x6f, 0x6e, 0x6d, 0x6c, 0x6b, 0x6a, 0x68, 0x66};

int		ramp3[8] = {0x6d, 0x6b, 6, 5, 4, 3};

particle_t	*active_particles, *free_particles;

particle_t	*particles;

int			r_numparticles;

vec3_t			r_pright, r_pup, r_ppn;

/*

===============

R_InitParticles

===============

*/

void R_InitParticles (void)

{

	int		i;

	i = COM_CheckParm ("-particles");

	if (i)

	{

		r_numparticles = (int)(Q_atoi(com_argv[i+1]));

		if (r_numparticles < ABSOLUTE_MIN_PARTICLES)

			r_numparticles = ABSOLUTE_MIN_PARTICLES;

	}

	else

	{

		r_numparticles = MAX_PARTICLES;

	}

	particles = (particle_t *)

			Hunk_AllocName (r_numparticles * sizeof(particle_t), "particles");

}

#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 = cl.time + 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

/*

===============

R_EntityParticles

===============

*/

#define NUMVERTEXNORMALS	162

extern	float	r_avertexnormals[NUMVERTEXNORMALS][3];

vec3_t	avelocities[NUMVERTEXNORMALS];

float	beamlength = 16;

vec3_t	avelocity = {23, 7, 3};

float	partstep = 0.01;

float	timescale = 0.01;

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

*(&avelocities[0][0] + i) = (rand()&255) * 0.01;

}

	for (i=0 ; i

	{

		angle = cl.time * avelocities[i][0];

		sy = sin(angle);

		cy = cos(angle);

		angle = cl.time * avelocities[i][1];

		sp = sin(angle);

		cp = cos(angle);

		angle = cl.time * 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 = cl.time + 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;

	}

}

/*

===============

R_ClearParticles

===============

*/

void R_ClearParticles (void)

{

	int		i;

	free_particles = &particles[0];

	active_particles = NULL;

	for (i=0 ;i

		particles[i].next = &particles[i+1];

	particles[r_numparticles-1].next = NULL;

}

void R_ReadPointFile_f (void)

{

	FILE	*f;

	vec3_t	org;

	int		r;

	int		c;

	particle_t	*p;

	char	name[MAX_OSPATH];

	sprintf (name,"maps/%s.pts", sv.name);

	COM_FOpenFile (name, &f);

	if (!f)

	{

		Con_Printf ("couldn't open %s\n", name);

		return;

	}

	Con_Printf ("Reading %s...\n", name);

	c = 0;

	for ( ;; )

	{

		r = fscanf (f,"%f %f %f\n", &org[0], &org[1], &org[2]);

		if (r != 3)

			break;

		c++;

		if (!free_particles)

		{

			Con_Printf ("Not enough free particles\n");

			break;

		}

		p = free_particles;

		free_particles = p->next;

		p->next = active_particles;

		active_particles = p;

		p->die = 99999;

		p->color = (-c)&15;

		p->type = pt_static;

		VectorCopy (vec3_origin, p->vel);

		VectorCopy (org, p->org);

	}

	fclose (f);

	Con_Printf ("%i points read\n", c);

}

/*

===============

R_ParseParticleEffect

Parse an effect out of the server message

===============

*/

void R_ParseParticleEffect (void)

{

	vec3_t		org, dir;

	int			i, count, msgcount, color;

	for (i=0 ; i<3 ; i++)

		org[i] = MSG_ReadCoord ();

	for (i=0 ; i<3 ; i++)

		dir[i] = MSG_ReadChar () * (1.0/16);

	msgcount = MSG_ReadByte ();

	color = MSG_ReadByte ();

if (msgcount == 255)

	count = 1024;

else

	count = msgcount;

	R_RunParticleEffect (org, dir, color, count);

}

/*

===============

R_ParticleExplosion

===============

*/

void R_ParticleExplosion (vec3_t org)

{

	int			i, j;

	particle_t	*p;

	for (i=0 ; i<1024 ; i++)

	{

		if (!free_particles)

			return;

		p = free_particles;

		free_particles = p->next;

		p->next = active_particles;

		active_particles = p;

		p->die = cl.time + 5;

		p->color = ramp1[0];

		p->ramp = rand()&3;

		if (i & 1)

		{

			p->type = pt_explode;

			for (j=0 ; j<3 ; j++)

			{

				p->org[j] = org[j] + ((rand()%32)-16);

				p->vel[j] = (rand()%512)-256;

			}

		}

		else

		{

			p->type = pt_explode2;

			for (j=0 ; j<3 ; j++)

			{

				p->org[j] = org[j] + ((rand()%32)-16);

				p->vel[j] = (rand()%512)-256;

			}

		}

	}

}

/*

===============

R_ParticleExplosion2

===============

*/

void R_ParticleExplosion2 (vec3_t org, int colorStart, int colorLength)

{

	int			i, j;

	particle_t	*p;

	int			colorMod = 0;

	for (i=0; i<512; i++)

	{

		if (!free_particles)

			return;

		p = free_particles;

		free_particles = p->next;

		p->next = active_particles;

		active_particles = p;

		p->die = cl.time + 0.3;

		p->color = colorStart + (colorMod % colorLength);

		colorMod++;

		p->type = pt_blob;

		for (j=0 ; j<3 ; j++)

		{

			p->org[j] = org[j] + ((rand()%32)-16);

			p->vel[j] = (rand()%512)-256;

		}

	}

}

/*

===============

R_BlobExplosion

===============

*/

void R_BlobExplosion (vec3_t org)

{

	int			i, j;

	particle_t	*p;

	for (i=0 ; i<1024 ; i++)

	{

		if (!free_particles)

			return;

		p = free_particles;

		free_particles = p->next;

		p->next = active_particles;

		active_particles = p;

		p->die = cl.time + 1 + (rand()&8)*0.05;

		if (i & 1)

		{

			p->type = pt_blob;

			p->color = 66 + rand()%6;

			for (j=0 ; j<3 ; j++)

			{

				p->org[j] = org[j] + ((rand()%32)-16);

				p->vel[j] = (rand()%512)-256;

			}

		}

		else

		{

			p->type = pt_blob2;

			p->color = 150 + rand()%6;

			for (j=0 ; j<3 ; j++)

			{

				p->org[j] = org[j] + ((rand()%32)-16);

				p->vel[j] = (rand()%512)-256;

			}

		}

	}

}

/*

===============

R_RunParticleEffect

===============

*/

void R_RunParticleEffect (vec3_t org, vec3_t dir, int color, int count)

{

	int			i, j;

	particle_t	*p;

	for (i=0 ; i

	{

		if (!free_particles)

			return;

		p = free_particles;

		free_particles = p->next;

		p->next = active_particles;

		active_particles = p;

		if (count == 1024)

		{	// rocket explosion

			p->die = cl.time + 5;

			p->color = ramp1[0];

			p->ramp = rand()&3;

			if (i & 1)

			{

				p->type = pt_explode;

				for (j=0 ; j<3 ; j++)

				{

					p->org[j] = org[j] + ((rand()%32)-16);

					p->vel[j] = (rand()%512)-256;

				}

			}

			else

			{

				p->type = pt_explode2;

				for (j=0 ; j<3 ; j++)

				{

					p->org[j] = org[j] + ((rand()%32)-16);

					p->vel[j] = (rand()%512)-256;

				}

			}

		}

		else

		{

			p->die = cl.time + 0.1*(rand()%5);

			p->color = (color&~7) + (rand()&7);

			p->type = pt_slowgrav;

			for (j=0 ; j<3 ; j++)

			{

				p->org[j] = org[j] + ((rand()&15)-8);

				p->vel[j] = dir[j]*15;// + (rand()%300)-150;

			}

		}

	}

}

/*

===============

R_LavaSplash

===============

*/

void R_LavaSplash (vec3_t org)

{

	int			i, j, k;

	particle_t	*p;

	float		vel;

	vec3_t		dir;

	for (i=-16 ; i<16 ; i++)

		for (j=-16 ; j<16 ; j++)

			for (k=0 ; k<1 ; k++)

			{

				if (!free_particles)

					return;

				p = free_particles;

				free_particles = p->next;

				p->next = active_particles;

				active_particles = p;

				p->die = cl.time + 2 + (rand()&31) * 0.02;

				p->color = 224 + (rand()&7);

				p->type = pt_slowgrav;

				dir[0] = j*8 + (rand()&7);

				dir[1] = i*8 + (rand()&7);

				dir[2] = 256;

				p->org[0] = org[0] + dir[0];

				p->org[1] = org[1] + dir[1];

				p->org[2] = org[2] + (rand()&63);

				VectorNormalize (dir);

				vel = 50 + (rand()&63);

				VectorScale (dir, vel, p->vel);

			}

}

/*

===============

R_TeleportSplash

===============

*/

void R_TeleportSplash (vec3_t org)

{

	int			i, j, k;

	particle_t	*p;

	float		vel;

	vec3_t		dir;

	for (i=-16 ; i<16 ; i+=4)

		for (j=-16 ; j<16 ; j+=4)

			for (k=-24 ; k<32 ; k+=4)

			{

				if (!free_particles)

					return;

				p = free_particles;

				free_particles = p->next;

				p->next = active_particles;

				active_particles = p;

				p->die = cl.time + 0.2 + (rand()&7) * 0.02;

				p->color = 7 + (rand()&7);

				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);

			}

}

void R_RocketTrail (vec3_t start, vec3_t end, int type)

{

	vec3_t		vec;

	float		len;

	int			j;

	particle_t	*p;

	int			dec;

	static int	tracercount;

	VectorSubtract (end, start, vec);

	len = VectorNormalize (vec);

	if (type < 128)

		dec = 3;

	else

	{

		dec = 1;

		type -= 128;

	}

	while (len > 0)

	{

		len -= dec;

		if (!free_particles)

			return;

		p = free_particles;

		free_particles = p->next;

		p->next = active_particles;

		active_particles = p;

		VectorCopy (vec3_origin, p->vel);

		p->die = cl.time + 2;

		switch (type)

		{

			case 0:	// rocket trail

				p->ramp = (rand()&3);

				p->color = ramp3[(int)p->ramp];

				p->type = pt_fire;

				for (j=0 ; j<3 ; j++)

					p->org[j] = start[j] + ((rand()%6)-3);

				break;

			case 1:	// smoke smoke

				p->ramp = (rand()&3) + 2;

				p->color = ramp3[(int)p->ramp];

				p->type = pt_fire;

				for (j=0 ; j<3 ; j++)

					p->org[j] = start[j] + ((rand()%6)-3);

				break;

			case 2:	// blood

				p->type = pt_grav;

				p->color = 67 + (rand()&3);

				for (j=0 ; j<3 ; j++)

					p->org[j] = start[j] + ((rand()%6)-3);

				break;

			case 3:

			case 5:	// tracer

				p->die = cl.time + 0.5;

				p->type = pt_static;

				if (type == 3)

					p->color = 52 + ((tracercount&4)<<1);

				else

					p->color = 230 + ((tracercount&4)<<1);

				tracercount++;

				VectorCopy (start, p->org);

				if (tracercount & 1)

				{

					p->vel[0] = 30*vec[1];

					p->vel[1] = 30*-vec[0];

				}

				else

				{

					p->vel[0] = 30*-vec[1];

					p->vel[1] = 30*vec[0];

				}

				break;

			case 4:	// slight blood

				p->type = pt_grav;

				p->color = 67 + (rand()&3);

				for (j=0 ; j<3 ; j++)

					p->org[j] = start[j] + ((rand()%6)-3);

				len -= 3;

				break;

			case 6:	// voor trail

				p->color = 9*16 + 8 + (rand()&3);

				p->type = pt_static;

				p->die = cl.time + 0.3;

				for (j=0 ; j<3 ; j++)

					p->org[j] = start[j] + ((rand()&15)-8);

				break;

		}

		VectorAdd (start, vec, start);

	}

}

/*

===============

R_DrawParticles

===============

*/

extern	cvar_t	sv_gravity;

void R_DrawParticles (void)

{

	particle_t		*p, *kill;

	float			grav;

	int				i;

	float			time2, time3;

	float			time1;

	float			dvel;

	float			frametime;

#ifdef GLQUAKE

	vec3_t			up, right;

	float			scale;

    GL_Bind(particletexture);

	glEnable (GL_BLEND);

	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

	glBegin (GL_TRIANGLES);

	VectorScale (vup, 1.5, up);

	VectorScale (vright, 1.5, right);

#else

	D_StartParticles ();

	VectorScale (vright, xscaleshrink, r_pright);

	VectorScale (vup, yscaleshrink, r_pup);

	VectorCopy (vpn, r_ppn);

#endif

	frametime = cl.time - cl.oldtime;

	time3 = frametime * 15;

	time2 = frametime * 10; // 15;

	time1 = frametime * 5;

	grav = frametime * sv_gravity.value * 0.05;

	dvel = 4*frametime;

	for ( ;; )

	{

		kill = active_particles;

		if (kill && kill->die < cl.time)

		{

			active_particles = kill->next;

			kill->next = free_particles;

			free_particles = kill;

			continue;

		}

		break;

	}

	for (p=active_particles ; p ; p=p->next)

	{

		for ( ;; )

		{

			kill = p->next;

			if (kill && kill->die < cl.time)

			{

				p->next = kill->next;

				kill->next = free_particles;

				free_particles = kill;

				continue;

			}

			break;

		}

#ifdef GLQUAKE

		// hack a scale up to keep particles from disapearing

		scale = (p->org[0] - r_origin[0])*vpn[0] + (p->org[1] - r_origin[1])*vpn[1]

			+ (p->org[2] - r_origin[2])*vpn[2];

		if (scale < 20)

			scale = 1;

		else

			scale = 1 + scale * 0.004;

		glColor3ubv ((byte *)&d_8to24table[(int)p->color]);

		glTexCoord2f (0,0);

		glVertex3fv (p->org);

		glTexCoord2f (1,0);

		glVertex3f (p->org[0] + up[0]*scale, p->org[1] + up[1]*scale, p->org[2] + up[2]*scale);

		glTexCoord2f (0,1);

		glVertex3f (p->org[0] + right[0]*scale, p->org[1] + right[1]*scale, p->org[2] + right[2]*scale);

#else

		D_DrawParticle (p);

#endif

		p->org[0] += p->vel[0]*frametime;

		p->org[1] += p->vel[1]*frametime;

		p->org[2] += p->vel[2]*frametime;

		switch (p->type)

		{

		case pt_static:

			break;

		case pt_fire:

			p->ramp += time1;

			if (p->ramp >= 6)

				p->die = -1;

			else

				p->color = ramp3[(int)p->ramp];

			p->vel[2] += grav;

			break;

		case pt_explode:

			p->ramp += time2;

			if (p->ramp >=8)

				p->die = -1;

			else

				p->color = ramp1[(int)p->ramp];

			for (i=0 ; i<3 ; i++)

				p->vel[i] += p->vel[i]*dvel;

			p->vel[2] -= grav;

			break;

		case pt_explode2:

			p->ramp += time3;

			if (p->ramp >=8)

				p->die = -1;

			else

				p->color = ramp2[(int)p->ramp];

			for (i=0 ; i<3 ; i++)

				p->vel[i] -= p->vel[i]*frametime;

			p->vel[2] -= grav;

			break;

		case pt_blob:

			for (i=0 ; i<3 ; i++)

				p->vel[i] += p->vel[i]*dvel;

			p->vel[2] -= grav;

			break;

		case pt_blob2:

			for (i=0 ; i<2 ; i++)

				p->vel[i] -= p->vel[i]*dvel;

			p->vel[2] -= grav;

			break;

		case pt_grav:

#ifdef QUAKE2

			p->vel[2] -= grav * 20;

			break;

#endif

		case pt_slowgrav:

			p->vel[2] -= grav;

			break;

		}

	}

#ifdef GLQUAKE

	glEnd ();

	glDisable (GL_BLEND);

	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);

#else

	D_EndParticles ();

#endif

}