/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2002-2009 John Fitzgibbons and others
Copyright (C) 2007-2008 Kristian Duske
Copyright (C) 2010-2014 QuakeSpasm developers

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 "q_defs.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

int32_t         ramp1[8] = {0x6f, 0x6d, 0x6b, 0x69, 0x67, 0x65, 0x63, 0x61};
int32_t         ramp2[8] = {0x6f, 0x6e, 0x6d, 0x6c, 0x6b, 0x6a, 0x68, 0x66};
int32_t         ramp3[8] = {0x6d, 0x6b, 6, 5, 4, 3};

particle_t      *active_particles, *free_particles, *particles;

vec3_t                  r_pright, r_pup, r_ppn;

int32_t                 r_numparticles;

gltexture_t *particletexture, *particletexture1, *particletexture2, *particletexture3, *particletexture4; //johnfitz
float texturescalefactor; //johnfitz -- compensate for apparent size of different particle textures

cvar_t  r_particles = {"r_particles", "1", CVAR_ARCHIVE}; //johnfitz
cvar_t  r_quadparticles = {"r_quadparticles", "1", CVAR_ARCHIVE}; //johnfitz

/*
===============
R_ParticleTextureLookup -- johnfitz -- generate nice antialiased 32x32 circle for particles
===============
*/
int32_t R_ParticleTextureLookup(int32_t x, int32_t y, int32_t sharpness)
{
	int32_t r; //distance from point x,y to circle origin, squared
	int32_t a; //alpha value to return

	x -= 16;
	y -= 16;
	r = x * x + y * y;
	r = r > 255 ? 255 : r;
	a = sharpness * (255 - r);
	a = q_min(a, 255);
	return a;
}

/*
===============
R_InitParticleTextures -- johnfitz -- rewritten
===============
*/
void R_InitParticleTextures(void)
{
	int32_t                 x, y;
	static byte     particle1_data[64 * 64 * 4];
	static byte     particle2_data[2 * 2 * 4];
	static byte     particle3_data[64 * 64 * 4];
	byte            *dst;

	// particle texture 1 -- circle
	dst = particle1_data;
	for(x = 0 ; x < 64 ; x++)
		for(y = 0 ; y < 64 ; y++)
		{
			*dst++ = 255;
			*dst++ = 255;
			*dst++ = 255;
			*dst++ = R_ParticleTextureLookup(x, y, 8);
		}
	particletexture1 = TexMgr_LoadImage(NULL, "particle1", 64, 64, SRC_RGBA, particle1_data, "", (src_offset_t)particle1_data, TEXPREF_PERSIST | TEXPREF_ALPHA | TEXPREF_LINEAR);

	// particle texture 2 -- square
	dst = particle2_data;
	for(x = 0 ; x < 2 ; x++)
		for(y = 0 ; y < 2 ; y++)
		{
			*dst++ = 255;
			*dst++ = 255;
			*dst++ = 255;
			*dst++ = x || y ? 0 : 255;
		}
	particletexture2 = TexMgr_LoadImage(NULL, "particle2", 2, 2, SRC_RGBA, particle2_data, "", (src_offset_t)particle2_data, TEXPREF_PERSIST | TEXPREF_ALPHA | TEXPREF_NEAREST);

	// particle texture 3 -- blob
	dst = particle3_data;
	for(x = 0 ; x < 64 ; x++)
		for(y = 0 ; y < 64 ; y++)
		{
			*dst++ = 255;
			*dst++ = 255;
			*dst++ = 255;
			*dst++ = R_ParticleTextureLookup(x, y, 2);
		}
	particletexture3 = TexMgr_LoadImage(NULL, "particle3", 64, 64, SRC_RGBA, particle3_data, "", (src_offset_t)particle3_data, TEXPREF_PERSIST | TEXPREF_ALPHA | TEXPREF_LINEAR);

	//set default
	particletexture = particletexture1;
	texturescalefactor = 1.27;
}

/*
===============
R_SetParticleTexture_f -- johnfitz
===============
*/
static void R_SetParticleTexture_f(cvar_t *var)
{
	(void)var;
	switch((int32_t)(r_particles.value))
	{
	case 1:
		particletexture = particletexture1;
		texturescalefactor = 1.27;
		break;
	case 2:
		particletexture = particletexture2;
		texturescalefactor = 1.0;
		break;
//	case 3:
//		particletexture = particletexture3;
//		texturescalefactor = 1.5;
//		break;
	}
}

/*
===============
R_InitParticles
===============
*/
void R_InitParticles(void)
{
	int32_t         i;

	i = COM_CheckParm("-particles");

	if(i)
	{
		r_numparticles = (int32_t)(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");

	Cvar_RegisterVariable(&r_particles);  //johnfitz
	Cvar_SetCallback(&r_particles, R_SetParticleTexture_f);
	Cvar_RegisterVariable(&r_quadparticles);  //johnfitz

	R_InitParticleTextures();  //johnfitz
}

/*
===============
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)
{
	int32_t         i;
	particle_t      *p;
	float           angle;
	float           sp, sy, cp, cy;
//	float                sr, cr;
//	int32_t              count;
	vec3_t          forward;
	float           dist;

	dist = 64;
//	count = 50;

	if(!avelocities[0][0])
	{
		for(i = 0; i < NUMVERTEXNORMALS; i++)
		{
			avelocities[i][0] = (rand() & 255) * 0.01;
			avelocities[i][1] = (rand() & 255) * 0.01;
			avelocities[i][2] = (rand() & 255) * 0.01;
		}
	}

	for(i = 0; i < NUMVERTEXNORMALS; 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)
{
	int32_t         i;

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

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

/*
===============
R_ReadPointFile_f
===============
*/
void R_ReadPointFile_f(void)
{
	FILE    *f;
	vec3_t  org;
	int32_t         r;
	int32_t         c;
	particle_t      *p;
	char    name[MAX_QPATH];

	if(cls.state != ca_connected)
		return;                 // need an active map.

	q_snprintf(name, sizeof(name), "maps/%s.pts", cl.mapname);

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

	Con_Printf("Reading %s...\n", name);
	c = 0;
	org[0] = org[1] = org[2] = 0; // silence pesky compiler warnings
	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("%" PRIi32 " points read\n", c);
}

/*
===============
R_ParseParticleEffect

Parse an effect out of the server message
===============
*/
void R_ParseParticleEffect(void)
{
	vec3_t          org, dir;
	int32_t                 i, count, msgcount, color;

	for(i = 0 ; i < 3 ; i++)
		org[i] = MSG_ReadCoord(cl.protocolflags);
	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)
{
	int32_t                 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, int32_t colorStart, int32_t colorLength)
{
	int32_t                 i, j;
	particle_t      *p;
	int32_t                 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)
{
	int32_t                 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, int32_t color, int32_t count)
{
	int32_t                 i, j;
	particle_t      *p;

	for(i = 0 ; i < count ; 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)
{
	int32_t                 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)
{
	int32_t                 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);
			}
}

/*
===============
R_RocketTrail

FIXME -- rename function and use #defined types instead of numbers
===============
*/
void R_RocketTrail(vec3_t start, vec3_t end, int32_t type)
{
	vec3_t          vec;
	float           len;
	int32_t                 j;
	particle_t      *p;
	int32_t                 dec;
	static int32_t  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[(int32_t)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[(int32_t)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);
	}
}

/*
===============
CL_RunParticles -- johnfitz -- all the particle behavior, separated from R_DrawParticles
===============
*/
void CL_RunParticles(void)
{
	particle_t              *p, *kill;
	int32_t                         i;
	float                   time1, time2, time3, dvel, frametime, grav;
	extern  cvar_t  sv_gravity;

	frametime = cl.time - cl.oldtime;
	time3 = frametime * 15;
	time2 = frametime * 10;
	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;
		}

		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[(int32_t)p->ramp];
			p->vel[2] += grav;
			break;

		case pt_explode:
			p->ramp += time2;
			if(p->ramp >= 8)
				p->die = -1;
			else
				p->color = ramp1[(int32_t)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[(int32_t)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:
		case pt_slowgrav:
			p->vel[2] -= grav;
			break;
		}
	}
}

/*
===============
R_DrawParticles -- johnfitz -- moved all non-drawing code to CL_RunParticles
===============
*/
void R_DrawParticles(void)
{
	particle_t              *p;
	float                   scale;
	vec3_t                  up, right, p_up, p_right, p_upright; //johnfitz -- p_ vectors
	GLubyte                 color[4], *c; //johnfitz -- particle transparency
	extern  cvar_t  r_particles; //johnfitz
	//float                 alpha; //johnfitz -- particle transparency

	if(!r_particles.value)
		return;

	//ericw -- avoid empty glBegin(),glEnd() pair below; causes issues on AMD
	if(!active_particles)
		return;

	VectorScale(vup, 1.5, up);
	VectorScale(vright, 1.5, right);

	GL_Bind(particletexture);
	glEnable(GL_BLEND);
	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
	glDepthMask(GL_FALSE);  //johnfitz -- fix for particle z-buffer bug

	if(r_quadparticles.value)  //johnitz -- quads save fillrate
	{
		glBegin(GL_QUADS);
		for(p = active_particles ; p ; p = p->next)
		{
			// 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 + 0.08; //johnfitz -- added .08 to be consistent
			else
				scale = 1 + scale * 0.004;

			scale /= 2.0; //quad is half the size of triangle

			scale *= texturescalefactor; //johnfitz -- compensate for apparent size of different particle textures

			//johnfitz -- particle transparency and fade out
			c = (GLubyte *) &d_8to24table[(int32_t)p->color];
			color[0] = c[0];
			color[1] = c[1];
			color[2] = c[2];
			//alpha = CLAMP(0, p->die + 0.5 - cl.time, 1);
			color[3] = 255; //(int32_t)(alpha * 255);
			glColor4ubv(color);
			//johnfitz

			glTexCoord2f(0, 0);
			glVertex3fv(p->org);

			glTexCoord2f(0.5, 0);
			VectorMA(p->org, scale, up, p_up);
			glVertex3fv(p_up);

			glTexCoord2f(0.5, 0.5);
			VectorMA(p_up, scale, right, p_upright);
			glVertex3fv(p_upright);

			glTexCoord2f(0, 0.5);
			VectorMA(p->org, scale, right, p_right);
			glVertex3fv(p_right);

			rs_particles++; //johnfitz //FIXME: just use r_numparticles
		}
		glEnd();
	}
	else //johnitz --  triangles save verts
	{
		glBegin(GL_TRIANGLES);
		for(p = active_particles ; p ; p = p->next)
		{
			// 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 + 0.08; //johnfitz -- added .08 to be consistent
			else
				scale = 1 + scale * 0.004;

			scale *= texturescalefactor; //johnfitz -- compensate for apparent size of different particle textures

			//johnfitz -- particle transparency and fade out
			c = (GLubyte *) &d_8to24table[(int32_t)p->color];
			color[0] = c[0];
			color[1] = c[1];
			color[2] = c[2];
			//alpha = CLAMP(0, p->die + 0.5 - cl.time, 1);
			color[3] = 255; //(int32_t)(alpha * 255);
			glColor4ubv(color);
			//johnfitz

			glTexCoord2f(0, 0);
			glVertex3fv(p->org);

			glTexCoord2f(1, 0);
			VectorMA(p->org, scale, up, p_up);
			glVertex3fv(p_up);

			glTexCoord2f(0, 1);
			VectorMA(p->org, scale, right, p_right);
			glVertex3fv(p_right);

			rs_particles++; //johnfitz //FIXME: just use r_numparticles
		}
		glEnd();
	}

	glDepthMask(GL_TRUE);  //johnfitz -- fix for particle z-buffer bug
	glDisable(GL_BLEND);
	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
	glColor3f(1, 1, 1);
}


/*
===============
R_DrawParticles_ShowTris -- johnfitz
===============
*/
void R_DrawParticles_ShowTris(void)
{
	particle_t              *p;
	float                   scale;
	vec3_t                  up, right, p_up, p_right, p_upright;
	extern  cvar_t  r_particles;

	if(!r_particles.value)
		return;

	VectorScale(vup, 1.5, up);
	VectorScale(vright, 1.5, right);

	if(r_quadparticles.value)
	{
		for(p = active_particles ; p ; p = p->next)
		{
			glBegin(GL_TRIANGLE_FAN);

			// 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 + 0.08; //johnfitz -- added .08 to be consistent
			else
				scale = 1 + scale * 0.004;

			scale /= 2.0; //quad is half the size of triangle

			scale *= texturescalefactor; //compensate for apparent size of different particle textures

			glVertex3fv(p->org);

			VectorMA(p->org, scale, up, p_up);
			glVertex3fv(p_up);

			VectorMA(p_up, scale, right, p_upright);
			glVertex3fv(p_upright);

			VectorMA(p->org, scale, right, p_right);
			glVertex3fv(p_right);

			glEnd();
		}
	}
	else
	{
		glBegin(GL_TRIANGLES);
		for(p = active_particles ; p ; p = p->next)
		{
			// 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 + 0.08; //johnfitz -- added .08 to be consistent
			else
				scale = 1 + scale * 0.004;

			scale *= texturescalefactor; //compensate for apparent size of different particle textures

			glVertex3fv(p->org);

			VectorMA(p->org, scale, up, p_up);
			glVertex3fv(p_up);

			VectorMA(p->org, scale, right, p_right);
			glVertex3fv(p_right);
		}
		glEnd();
	}
}