/*
	sw_rpart.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

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

static __attribute__ ((unused)) const char rcsid[] = 
	"$Id$";

#include <stdlib.h>

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

#include "compat.h"
#include "r_cvar.h"
#include "r_dynamic.h"
#include "r_local.h"

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 };


void
R_InitParticles (void)
{
}

void
R_ClearParticles (void)
{
	unsigned int i;

	free_particles = &particles[0];
	active_particles = NULL;

	for (i = 0; i < r_maxparticles; i++)
		particles[i].next = &particles[i + 1];
	if (r_maxparticles)
		particles[r_maxparticles - 1].next = NULL;
}

void
R_ReadPointFile_f (void)
{
	QFile      *f;
	vec3_t      org;
	int         r;
	int         c;
	particle_t *p;
	char        name[MAX_OSPATH];

	// FIXME    snprintf (name, sizeof (name), "maps/%s.pts", sv.name);

	QFS_FOpenFile (name, &f);
	if (!f) {
		Con_Printf ("couldn't open %s\n", name);
		return;
	}

	Con_Printf ("Reading %s...\n", name);
	c = 0;
	for (;;) {
		char        buf[64];

		Qgets (f, buf, sizeof (buf));
		r = sscanf (buf, "%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);
	}

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

static void
R_ParticleExplosion_QF (const vec3_t org)
{
	int         i, j;
	particle_t *p;

	if (!r_particles->int_val)
		return;

	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 = r_realtime + 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;
			}
		}
	}
}

static void
R_ParticleExplosion2_QF (const 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 = r_realtime + 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;
		}
	}
}

static void
R_BlobExplosion_QF (const vec3_t org)
{
	int         i, j;
	particle_t *p;

	if (!r_particles->int_val)
		return;

	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 = r_realtime + 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;
			}
		}
	}
}

static void
R_RunParticleEffect_QF (const vec3_t org, const vec3_t dir, int color,
						int count)
{
	int         i, j;
	particle_t *p;

	if (!r_particles->int_val)
		return;

	for (i = 0; i < count; i++) {
		if (!free_particles)
			return;
		p = free_particles;
		free_particles = p->next;
		p->next = active_particles;
		active_particles = p;

		p->die = r_realtime + 0.1 * (rand () % 5);
		p->color = (color & ~7) + (rand () & 7);
		p->type = pt_grav;
		for (j = 0; j < 3; j++) {
			p->org[j] = org[j] + ((rand () & 15) - 8);
			p->vel[j] = dir[j];	// + (rand()%300)-150;
		}
	}
}

static void
R_SpikeEffect_QF (const vec3_t org)
{
	R_RunParticleEffect_QF (org, vec3_origin, 0, 10);
}

static void
R_SuperSpikeEffect_QF (const vec3_t org)
{
	R_RunParticleEffect (org, vec3_origin, 0, 20);
}

static void
R_KnightSpikeEffect_QF (const vec3_t org)
{
	R_RunParticleEffect_QF (org, vec3_origin, 226, 20);
}

static void
R_WizSpikeEffect_QF (const vec3_t org)
{
	R_RunParticleEffect_QF (org, vec3_origin, 20, 30);
}

static void
R_BloodPuffEffect_QF (const vec3_t org, int count)
{
	R_RunParticleEffect_QF (org, vec3_origin, 73, count);
}

static void
R_GunshotEffect_QF (const vec3_t org, int count)
{
	R_RunParticleEffect_QF (org, vec3_origin, 0, count);
}

static void
R_LightningBloodEffect_QF (const vec3_t org)
{
	R_RunParticleEffect_QF (org, vec3_origin, 225, 50);
}

static void
R_LavaSplash_QF (const vec3_t org)
{
	int         i, j, k;
	particle_t *p;
	float       vel;
	vec3_t      dir;

	if (!r_particles->int_val)
		return;

	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 = r_realtime + 2 + (rand () & 31) * 0.02;
				p->color = 224 + (rand () & 7);
				p->type = pt_grav;

				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);
			}
}

static void
R_TeleportSplash_QF (const vec3_t org)
{
	int         i, j, k;
	particle_t *p;
	float       vel;
	vec3_t      dir;

	if (!r_particles->int_val)
		return;

	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 = r_realtime + 0.2 + (rand () & 7) * 0.02;
				p->color = 7 + (rand () & 7);
				p->type = pt_grav;

				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);
			}
}

static void
R_RocketTrail_QF (entity_t *ent)
{
	float		len;
	int			j;
	particle_t *p;
	vec3_t		vec;

	if (!r_particles->int_val)
		return;

	VectorSubtract (ent->origin, ent->old_origin, vec);
	len = VectorNormalize (vec);

	while (len > 0) {
		len -= 3;

		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 = r_realtime + 2;
		p->ramp = (rand () & 3);
		p->color = ramp3[(int) p->ramp];
		p->type = pt_fire;
		for (j = 0; j < 3; j++)
			p->org[j] = ent->old_origin[j] + ((rand () % 6) - 3);

		VectorAdd (ent->old_origin, vec, ent->old_origin);
	}
}

static void
R_GrenadeTrail_QF (entity_t *ent)
{
	float		len;
	int			j;
	particle_t *p;
	vec3_t		vec;

	if (!r_particles->int_val)
		return;

	VectorSubtract (ent->origin, ent->old_origin, vec);
	len = VectorNormalize (vec);

	while (len > 0) {
		len -= 3;

		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 = r_realtime + 2;
		p->ramp = (rand () & 3) + 2;
		p->color = ramp3[(int) p->ramp];
		p->type = pt_fire;
		for (j = 0; j < 3; j++)
			p->org[j] = ent->old_origin[j] + ((rand () % 6) - 3);

		VectorAdd (ent->old_origin, vec, ent->old_origin);
	}
}

static void
R_BloodTrail_QF (entity_t *ent)
{
	float		len;
	int			j;
	particle_t *p;
	vec3_t		vec;

	if (!r_particles->int_val)
		return;

	VectorSubtract (ent->origin, ent->old_origin, vec);
	len = VectorNormalize (vec);

	while (len > 0) {
		len -= 3;

		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 = r_realtime + 2;
		p->type = pt_slowgrav;
		p->color = 67 + (rand () & 3);
		for (j = 0; j < 3; j++)
			p->org[j] = ent->old_origin[j] + ((rand () % 6) - 3);
		break;

		VectorAdd (ent->old_origin, vec, ent->old_origin);
	}
}

static void
R_SlightBloodTrail_QF (entity_t *ent)
{
	float		len;
	int			j;
	particle_t *p;
	vec3_t		vec;

	if (!r_particles->int_val)
		return;

	VectorSubtract (ent->origin, ent->old_origin, vec);
	len = VectorNormalize (vec);

	while (len > 0) {
		len -= 6;

		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 = r_realtime + 2;
		p->type = pt_slowgrav;
		p->color = 67 + (rand () & 3);
		for (j = 0; j < 3; j++)
			p->org[j] = ent->old_origin[j] + ((rand () % 6) - 3);

		VectorAdd (ent->old_origin, vec, ent->old_origin);
	}
}

static void
R_WizTrail_QF (entity_t *ent)
{
	float		len;
	particle_t *p;
	vec3_t		vec;

	if (!r_particles->int_val)
		return;

	VectorSubtract (ent->origin, ent->old_origin, vec);
	len = VectorNormalize (vec);

	while (len > 0) {
		static int  tracercount;

		len -= 3;

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

		p->die = r_realtime + 0.5;
		p->type = pt_static;
		p->color = 52 + ((tracercount & 4) << 1);

		tracercount++;

		VectorCopy (ent->old_origin, p->org);
		if (tracercount & 1) {
			p->vel[0] = 30.0 * vec[1];
			p->vel[1] = 30.0 * -vec[0];
		} else {
			p->vel[0] = 30.0 * -vec[1];
			p->vel[1] = 30.0 * vec[0];
		}
		p->vel[2] = 0.0;

		VectorAdd (ent->old_origin, vec, ent->old_origin);
	}
}

static void
R_FlameTrail_QF (entity_t *ent)
{
	float		len;
	particle_t *p;
	vec3_t		vec;

	if (!r_particles->int_val)
		return;

	VectorSubtract (ent->origin, ent->old_origin, vec);
	len = VectorNormalize (vec);

	while (len > 0) {
		static int tracercount;

		len -= 3;

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

		p->die = r_realtime + 0.5;
		p->type = pt_static;
		p->color = 230 + ((tracercount & 4) << 1);

		tracercount++;

		VectorCopy (ent->old_origin, 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];
		}
		p->vel[2] = 0.0;

		VectorAdd (ent->old_origin, vec, ent->old_origin);
	}
}

static void
R_VoorTrail_QF (entity_t *ent)
{
	float		len;
	int			j;
	particle_t *p;
	vec3_t		vec;

	if (!r_particles->int_val)
		return;

	VectorSubtract (ent->origin, ent->old_origin, vec);
	len = VectorNormalize (vec);

	while (len > 0) {
		len -= 3;

		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 = r_realtime + 0.3;
		p->type = pt_static;
		p->color = 9 * 16 + 8 + (rand () & 3);
		for (j = 0; j < 3; j++)
			p->org[j] = ent->old_origin[j] + ((rand () & 15) - 8);

		VectorAdd (ent->old_origin, vec, ent->old_origin);
	}
}

void
R_DrawParticles (void)
{
	particle_t *p, **particle;
	float       grav;
	int         i;
	float       time2, time3;
	float       time1;
	float       dvel;
	float       frametime;

	D_StartParticles ();

	VectorScale (vright, xscaleshrink, r_pright);
	VectorScale (vup, yscaleshrink, r_pup);
	VectorCopy (vpn, r_ppn);

	frametime = r_frametime;
	time3 = frametime * 15;
	time2 = frametime * 10;				// 15;
	time1 = frametime * 5;
	grav = frametime * 800 * 0.05;
	dvel = 4 * frametime;

	for (particle = &active_particles; *particle;) {
		if ((*particle)->die < r_realtime) {
			p = (*particle)->next;
			(*particle)->next = free_particles;
			free_particles = (*particle);
			(*particle) = p;
		} else {
			p = *particle;
			particle = &(*particle)->next;

			D_DrawParticle (p);

			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_slowgrav:
				case pt_grav:
					p->vel[2] -= grav;
					break;
				default:
					Con_DPrintf ("unhandled particle type %d\n", p->type);
					break;
			}
		}
	}
	D_EndParticles ();
}

void
r_easter_eggs_f (cvar_t *var)
{
}

void
r_particles_style_f (cvar_t *var)
{
}

static void
R_ParticleFunctionInit (void)
{
	R_BlobExplosion = R_BlobExplosion_QF;
	R_ParticleExplosion = R_ParticleExplosion_QF;
	R_ParticleExplosion2 = R_ParticleExplosion2_QF;
	R_LavaSplash = R_LavaSplash_QF;
	R_TeleportSplash = R_TeleportSplash_QF;

	R_BloodPuffEffect = R_BloodPuffEffect_QF;
	R_GunshotEffect = R_GunshotEffect_QF;
	R_LightningBloodEffect = R_LightningBloodEffect_QF;

	R_RunParticleEffect = R_RunParticleEffect_QF;
	R_SpikeEffect = R_SpikeEffect_QF;
	R_SuperSpikeEffect = R_SuperSpikeEffect_QF;
	R_KnightSpikeEffect = R_KnightSpikeEffect_QF;
	R_WizSpikeEffect = R_WizSpikeEffect_QF;

	R_RocketTrail = R_RocketTrail_QF;
	R_GrenadeTrail = R_GrenadeTrail_QF;
	R_BloodTrail = R_BloodTrail_QF;
	R_SlightBloodTrail = R_SlightBloodTrail_QF;
	R_WizTrail = R_WizTrail_QF;
	R_FlameTrail = R_FlameTrail_QF;
	R_VoorTrail = R_VoorTrail_QF;
}

void
R_Particles_Init_Cvars (void)
{
	R_ParticleFunctionInit ();
}