System Booster/System Booster.iso/Screenblankers/GBlanker/GSource/Blankers/Fireworks/blank.c

C/C++ Source or Header | 1996-09-26 | 4KB | 221 lines

/*
 *  Copyright (c) 1994 Michael D. Bayne.
 *  All rights reserved.
 *
 *  Please see the documentation accompanying the distribution for distribution
 *  and disclaimer information.
 */

#include <exec/memory.h>
#include <hardware/custom.h>
#include "/includes.h"

#define SCALE 100
#define ACCEL 4

#define    MAX_FIRE       200
#define    MAX_EXPLOSIONS 25

#define    NONE      0
#define    FIRE      1
#define    EXPLODING 2

extern __far struct Custom custom;

struct Fire
{
    BYTE type;
    BYTE time;
    ULONG x;
    ULONG y;
    LONG vx;
    LONG vy;
    LONG color;
};

#define NUMBER 0
#define POWER  2
#define RADIUS 4
#define MODE   6

struct Fire *FireTable, *LastFire;
LONG MaxFires, NumFires, Power, Radius, Wid, Hei;

#include "Fireworks_rev.h"
STATIC const UBYTE VersTag[] = VERSTAG;

VOID Defaults( PrefObject *Prefs )
{
    Prefs[NUMBER].po_Level = 16;
    Prefs[POWER].po_Level = 5;
    Prefs[RADIUS].po_Level = 6;
    Prefs[MODE].po_ModeID = getTopScreenMode();
    Prefs[MODE].po_Depth = 2;
}

LONG CheckFire( struct Fire *f )
{
    if( f->x/SCALE >= Wid )
        return 1;

    if( f->y/SCALE >= Hei )
        return 1;

    return 0 ;
}

VOID IterateFire( struct RastPort *Rast )
{
    LONG l;
    struct Fire *f, *tf;

    if(( NumFires < MaxFires )&&( RangeRand( 100 ) > 90 ))
    {
        for( tf = FireTable; tf->type; tf++ );
        if( tf != LastFire )
        {
            tf->type = FIRE;
            tf->x = ( Wid / 4 + RangeRand( Wid / 2 )) * SCALE;
            tf->y = ( Hei - 5 ) * SCALE;
            tf->color = RangeRand(( 1L << Rast->BitMap->Depth ) - 1 ) + 1;
            tf->vx = RangeRand( SCALE * Hei / 100 ) - SCALE;
            tf->vy = -1 * ( Power * SCALE * Hei / 400 );
            tf->time = RangeRand( 100 ) + 100;
            NumFires++;
        }
    }

    for( f = FireTable; f != LastFire; f++ )
    {
        switch( f->type )
        {
        case NONE:
            break;
        case FIRE:
            if( !f->time )
            {
                for( l = 0, tf = FireTable; ( l < MAX_EXPLOSIONS )&&
                    ( tf != LastFire ); tf++ )
                {
                    if( !tf->type )
                    {
                        CopyMem( f, tf, sizeof( struct Fire ));
                        tf->type = EXPLODING;
                        tf->vx = ( RangeRand( 100 ) - 50 ) *
                            ( Radius * Wid / 1000 );
                        tf->vy = ( RangeRand( 100 ) - 50 ) *
                            ( Radius * Hei / 1000 );
                        tf->time = RangeRand( 10 ) + 50;
                        l++;
                    }
                }
                NumFires--;
                f->type = NONE;
            }
            else
            {
                SetAPen( Rast, 0 );
                WritePixel( Rast, f->x/SCALE, f->y/SCALE );
                f->x += f->vx;
                f->y += f->vy;
                if( CheckFire( f ))
                {
                    f->type = NONE;
                    NumFires--;
                }
                else
                {
                    SetAPen( Rast, f->color );
                    WritePixel( Rast, f->x/SCALE, f->y/SCALE );
                    f->vy += ACCEL;
                    f->time--;
                }
            }
            break;
        case EXPLODING:
            SetAPen( Rast, 0 );
            WritePixel( Rast, f->x/SCALE, f->y/SCALE );
            if( !f->time )
                f->type = NONE;
            else
            {
                f->x += f->vx;
                f->y += f->vy;
                if( CheckFire( f ))
                    f->type = NONE;
                else
                {
                    SetAPen( Rast, f->color );
                    WritePixel( Rast, f->x/SCALE, f->y/SCALE );
                    f->vy += ACCEL;
                    f->time--;
                }
            }
            break;
        }
    }
}

LONG Blank( PrefObject *Prefs )
{
    struct Screen *Scr;
    struct Window *Wnd;
    LONG ToFrontCount = 0, RetVal = OK;

    MaxFires = Prefs[NUMBER].po_Level;
    Power = Prefs[POWER].po_Level;
    Radius = Prefs[RADIUS].po_Level;

    FireTable = AllocVec( sizeof( struct Fire ) * ( MAX_FIRE + 1 ),
                         MEMF_CLEAR );

    if( FireTable )
    {
        Scr = OpenScreenTags( 0L, SA_Depth, Prefs[MODE].po_Depth,
                             SA_Overscan, OSCAN_STANDARD, SA_Quiet, TRUE,
                             SA_DisplayID, Prefs[MODE].po_ModeID,
                             SA_Behind, TRUE, TAG_DONE );
        if( Scr )
        {
            LastFire = &( FireTable[MAX_FIRE] );

            Wid = Scr->Width;
            Hei = Scr->Height;

            if( Prefs[MODE].po_Depth < 3 )
                setCopperList( Hei, 1, &( Scr->ViewPort ), &custom );

            SetRGB4(&( Scr->ViewPort ), 0, 0, 0, 0 );
            SetRGB4(&( Scr->ViewPort ), 1, 0x0F, 0x0F, 0x0F );
            SetRast(&( Scr->RastPort ), 0 );

            NumFires = 0;
            Wnd = BlankMousePointer( Scr );
            ScreenToFront( Scr );

            while( RetVal == OK )
            {
                WaitTOF();
                IterateFire(&( Scr->RastPort ));
                if(!( ToFrontCount++ % 60 ))
                    ScreenToFront( Scr );
                if(!( ToFrontCount % 5 ))
                    RetVal = ContinueBlanking();
            }

            UnblankMousePointer( Wnd );
            if( Prefs[MODE].po_Depth < 3 )
                clearCopperList( &Scr->ViewPort );
            CloseScreen( Scr );
        }
        else
            RetVal = FAILED;

        FreeVec( FireTable );
    }
    else
        RetVal = FAILED;

    return RetVal;
}