[Duvida] Codigo screenfade

#include < amxmodx >

#pragma semicolon 1

#define PLUGIN "ScreenFade on Round Start"
#define VERSION "0.0.1"


enum ( <<=1 ){
    FFADE_IN, // Apenas Aqui para que nao passe 0 para funcao
    FFADE_OUT = 1, // Fade out (not in)
    FFADE_MODULATE, // Modulate (don't blend)
    FFADE_STAYOUT // ignores the duration, stays faded out until new ScreenFade message received
}

public plugin_init()
{
    register_plugin( PLUGIN, VERSION, "ConnorMcLeod" );
    register_logevent("LogEvent_Round_Start", 15, "1=Round_Start");
}

public LogEvent_Round_Start()
{
    new players[32], num;
    get_players(players, num);
    for(--num; num>=0; num--)
    {
        UTIL_ScreenFade(players[num], {0,0,0}, 0.5, 1.0, 255, FFADE_IN, true);
    }
}

FixedUnsigned16( Float:value, scale )
{
    new output;

    output = floatround(value * scale);
    if ( output < 0 )
        output = 0;
    if ( output > 0xFFFF )
        output = 0xFFFF;

    return output;
}

UTIL_ScreenFade(const id=0,const iColor[3]={0,0,0},const Float:flFxTime=-1.0,const Float:flHoldTime=0.0,const iAlpha=0,const iFlags=FFADE_IN,bool:bReliable=false,bool:bExternal=false)
{
    if( id && !is_user_connected(id))
        return;

    new iFadeTime;
    if( flFxTime == -1.0 )
    {
        iFadeTime = 4;
    }
    else
    {
        iFadeTime = FixedUnsigned16( flFxTime , 1<<12 );
    }

    static msgScreenFade = 0;
    if( !msgScreenFade )
    {
        msgScreenFade = get_user_msgid("ScreenFade");
    }

    new MSG_DEST;
    if( bReliable )
    {
        MSG_DEST = id ? MSG_ONE : MSG_ALL;
    }
    else
    {
        MSG_DEST = id ? MSG_ONE_UNRELIABLE : MSG_BROADCAST;
    }

    if( bExternal )
    {
        emessage_begin( MSG_DEST, msgScreenFade, _, id );
        ewrite_short( iFadeTime );
        ewrite_short( FixedUnsigned16( flHoldTime , 1<<12 ) );
        ewrite_short( iFlags );
        ewrite_byte( iColor[0] );
        ewrite_byte( iColor[1] );
        ewrite_byte( iColor[2] );
        ewrite_byte( iAlpha );
        emessage_end();
    }
    else
    {
        message_begin( MSG_DEST, msgScreenFade, _, id );
        write_short( iFadeTime );
        write_short( FixedUnsigned16( flHoldTime , 1<<12 ) );
        write_short( iFlags );
        write_byte( iColor[0] );
        write_byte( iColor[1] );
        write_byte( iColor[2] );
        write_byte( iAlpha );
        message_end();
    }
}