風船 Balloons version 2 | MSX-BASIC 2.0+ (MSX2/MSX2+/turbo R) / z88dk https://msxjpn.jimdofree.com/%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%A0/%E9%A2%A8%E8%88%B9/

balloons.c

/*
 Balloons version 2 | MSX2 / z88dk
 Copyright (c) 2019-2025 BALLOON | FU-SEN
 The MIT License (MIT) - https://mit.balloon.net.eu.org/#2019-2025

 zcc +msx -lndos -create-app -subtype=disk -bn balloons balloons.c
 --> BLOAD"BALLOONS.MSX",R
*/

void wrtvdp(char reg, char data)
{
#asm
    ld   ix,0
    add  ix,sp
    ld   b,(ix+2)       ; data
    ld   c,(ix+4)       ; reg
    call 0047h          ; WRTVDP
#endasm
}

void wrtvrm(int addr, char data)
{
#asm
    ld   ix,0
    add  ix,sp
    ld   a,(ix+2)       ; data
    ld   l,(ix+4)       ; addr
    ld   h,(ix+5)
    call 004dh          ; WRTVRM
#endasm
}

void filvrm(int addr, int size, char data)
{
#asm
    ld   ix,0
    add  ix,sp
    ld   a,(ix+2)       ; data
    ld   c,(ix+4)       ; size
    ld   b,(ix+5)
    ld   l,(ix+6)       ; addr
    ld   h,(ix+7)
    call 0056h          ; FILVRM
#endasm
}

void ldirvm(int addr, int vaddr, int size)
{
#asm
    ld   ix,0
    add  ix,sp
    ld   c,(ix+2)       ; size
    ld   b,(ix+3)
    ld   e,(ix+4)       ; vaddr
    ld   d,(ix+5)
    ld   l,(ix+6)       ; addr
    ld   h,(ix+7)
    call 005ch          ; LDIRVM
#endasm
}

void chgclr(char forclr, char bakclr, char bdrclr)
{
#asm
    ld   ix,0
    add  ix,sp
    ld   a,(ix+2)       ; BDRCLR
    ld   (0f3ebh),a
    ld   a,(ix+4)       ; BAKCLR
    ld   (0f3eah),a
    ld   a,(ix+6)       ; FORCLR
    ld   (0f3e9h),a
    call 0062h          ; CHGCLR
#endasm
}

void init32()
{
#asm
    call 006fh          ; INIT32
#endasm
}

void cls()
{
#asm
    xor  a              ; Clear Z flag
    call 00c3h          ; CLS
#endasm
}

int gttrig(char btn)
{
#asm
    ld   a,l            ; btn
    call 00d8h          ; GTTRIG
    ld   l,a
    ld   h,0
#endasm
}

void kilbuf()
{
#asm
    call 00156h         ; KILBUF
#endasm
}

int redclk(char addr)
{
#asm
    ld   c,l
    ld   ix,01F5h       ; REDCLK
    call 015fh          ; EXTROM
    and  0fh
    ld   l,a
    ld   h,0
#endasm
}

void height212()
{
#asm
    ld	 hl,0ffe8h      ; rg9sav
    set  7,(hl)
    ld   a,(hl)
    ld   b,a
    ld   c,9            ; R#9
    call 0047h          ; WRTVDP
#endasm
}

void poke(int addr, char data)
{
#asm
    ld   ix,0
    add  ix,sp
    ld   a,(ix+2)       ; data
    ld   l,(ix+4)       ; addr
    ld   h,(ix+5)
    ld   (hl),a
#endasm
}

int peek(int addr)
{
#asm
    ld   a,(hl)         ; addr
    ld   l,a
    ld   h,0
#endasm
}

unsigned int r;

unsigned char rnd()
{
    r++;
    r ^= r >> 3;
    r ^= r << 5;
    r ^= r >> 7;
    return(r);
}

char balloon[8] = {0x38,0x74,0xfa,0xfe,0xfe,0x7c,0x38,0x10};
char ribbon[8]  = {0x10,0x08,0x08,0x10,0x10,0x08,0x08,0x10};
int s=0,y=27;

void main()
{
    /* r=peek(0xfc9e); */
    r=redclk(2)*60+redclk(1)*10+redclk(0);

    chgclr(15, 1, 1);
    init32();
    height212();
    cls();
    filvrm(0x1800+24*32, 32*8, 32);

    for(int c=2; c<16; c++){
        ldirvm(balloon, (120+c*8)*8, 8);
        wrtvrm(0x2000+(120/8)+c, c*16+1);
    }

    ldirvm(ribbon, 248*8, 8);

    while(!gttrig(0)){
        int c=rnd()%14+1;
        int x=rnd()%30+1;

        wrtvrm(0x1800+y*32+x, 128+c*8);

        for(int ss=0; ss<8; ss++){
            wrtvdp(23, s+ss);

            for(int w=0; w<2; w++){
                int tim=peek(0xfc9e);
                while(peek(0xfc9e)==tim && !gttrig(0)) ;
            }
        }

        s=(s+8)%256;
        wrtvdp(23, s);

        y=(y+1)%32;

        filvrm(0x1800+y*32, 32, 32);
        wrtvrm(0x1800+y*32+x, 248);
    }

    chgclr(15, 4, 7);
    init32();

    kilbuf();
}