Real Snow

#include <amxmodx>
#include <engine>
#include <hamsandwich>

#define PLUGIN  "Snow"
#define VERSION "0.6"
#define AUTHOR  "Mistrick / edit LAWLIET / Nickron"

#define get_bit(%1,%2)  (%1 & (1 << (%2 & MAXCLIENTS-1)))
#define set_bit(%1,%2)  (%1 |= (1 << (%2 & MAXCLIENTS-1)))
#define reset_bit(%1,%2)        (%1 &= ~(1 << (%2 & MAXCLIENTS-1)))

#define MAXCLIENTS 32
#define SNOW_SPRITE "sprites/lawliet_snow/lawliet_snow.spr"
#define CLASSNAME "SnowEntity"

new g_bAlive;

new g_iSpriteSnow;
new g_iMaxPlayers;

public plugin_init()
{
	register_plugin(PLUGIN, VERSION, AUTHOR);

	register_event("HLTV", "Event_NewRound", "a", "1=0", "2=0");
	register_cvar("lawliet", "ny_RainingSnow", FCVAR_SERVER);

	new ent = create_entity("info_target");

	entity_set_string(ent, EV_SZ_classname, CLASSNAME);
	entity_set_float(ent, EV_FL_nextthink, get_gametime() + 2.0);

	register_think(CLASSNAME, "ThinkSnow");

	RegisterHam(Ham_Spawn, "player", "Ham_PlayerSpawn_Post", 1);
	RegisterHam(Ham_Killed, "player", "HamPlayerKilled_Post", 1);

	g_iMaxPlayers = get_maxplayers();
}
public plugin_precache()
{
	g_iSpriteSnow = precache_model(SNOW_SPRITE);
}
public Ham_PlayerSpawn_Post(id)
{
	if(is_user_alive(id)) set_bit(g_bAlive, id);
}
public Event_NewRound(){
	set_fog(0, 255, 255);
	set_lights ("c");
}
public HamPlayerKilled_Post(id)
{
	reset_bit(g_bAlive, id);
}
public ThinkSnow(ent)
{
	entity_set_float(ent, EV_FL_nextthink, get_gametime() + 0.05);

	static id;
	for(id = 1; id <= g_iMaxPlayers; id++)
	{
		if(!get_bit(g_bAlive, id)) continue;

		new Float:fOrigin[3], iOrigin[3];
		entity_get_vector(id, EV_VEC_origin, fOrigin);
		FVecIVec(fOrigin, iOrigin);
		iOrigin[0] += random_num(-1000, 1000);
		iOrigin[1] += random_num(-1000, 1000);
		iOrigin[2] += random_num(100, 200);
		UTIL_CreateSnow(iOrigin, g_iSpriteSnow, 1, 1, 4);
	}
}
stock UTIL_CreateSnow(const iOrigin[3], const iSpriteID, const iCount, const iLife, const iScale)
{
	message_begin(MSG_BROADCAST,SVC_TEMPENTITY);
	write_byte(TE_SPRITETRAIL);
	write_coord(iOrigin[0]);        // start position (X)
	write_coord(iOrigin[1]);        // start position (Y)
	write_coord(iOrigin[2]);        // start position (Z)
	write_coord(iOrigin[0]);                // end position (X)
	write_coord(iOrigin[1]);                // end position (Y)
	write_coord(iOrigin[2]);                // end position (Z)
	write_short(iSpriteID);                 // sprite index
	write_byte(iCount);                             // number of snow
	write_byte(iLife);                              // life in 0.1's
	write_byte(iScale);                             // scale in 0.1's
	write_byte(random_num(1, 5));   // velocity along vector in 10's
	write_byte(random_num(1, 3));   // randomness of velocity in 10's
	message_end();
}

stock set_fog(red, green, blue){
	message_begin(MSG_ALL, get_user_msgid("Fog"));
	write_byte(red);
	write_byte(green);
	write_byte(blue);
	write_long(_:0.00050)
	message_end();
}