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ファミコンエミュレータで
ゲームプログラミング
Daniel Sangorrin ( ダニエル )
@daromart
@daromart
Open Source UN conference 2018
KAWAGOE
2018/04/14
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6502 アセンブリ
https://skilldrick.github.io/easy6502/
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WINE + FCEUX
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Fceux available in Linux
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But no debug functionality
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WINE to run the Win32 version
$ sudo dpkg --add-architecture i386
$ wget -nc https://dl.winehq.org/wine-builds/Release.key
$ sudo apt-key add Release.key
$ sudo apt-add-repository https://dl.winehq.org/wine-
builds/ubuntu/
$ sudo apt-get update
$ sudo apt-get install --install-recommends winehq-stable
[Alt] sudo apt-get install --install-recommends winehq-devel
$ wine fceux xxx.nes
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cc65
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Install the cc65 compiler
$ git clone https://github.com/cc65/cc65.git
$ cd cc65
$ make
$ sudo porg -lp cc65 make install PREFIX=/usr
$ porg -f cc65
/usr/bin/*65
/usr/share/cc65/*
$ which cc65
/usr/bin/cc65 <- C compiler
$ which ca65
/usr/bin/ca65 <- ASM compiler
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Hello World
$ git clone https://github.com/cirla/nesdev.git
$ cd nesdev
$ git checkout hello_world
$ ls
reset.s: initialization of the NES
hello_world.c: contains main called from reset.s
hello_world.cfg: linker script (describes the CPU memory map used)
sprites.chr: file with sprites (Bitmap ROM)
$ make
-> hello_world.nes
$ wine fceux.exe hello_world.nes
-> shows a hello world
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Nametable
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コードでいうと
const unsigned char nametable[7*8]={
0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x05,0x06,0x07,0x00,0x00,
0x00,0x00,0x15,0x16,0x17,0x00,0x00,
0x00,0x00,0x15,0x16,0x0b,0x00,0x00,
0x00,0x00,0x15,0x16,0x17,0x00,0x00,
0x00,0x00,0x15,0x16,0x17,0x00,0x00,
0x00,0x14,0x14,0x14,0x14,0x14,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00
};
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UnRLE
void Draw_Background(void) {
PPU_ADDRESS = 0x20; // nametable 0 address (0x2000)
PPU_ADDRESS = 0x00;
UnRLE(N2); // uncompress
}
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main
void main (void) {
PPU_CTRL = 0;
PPU_MASK = 0;
Draw_Background();
PPU_ADDRESS = 0x3f;
PPU_ADDRESS = 0x00;
for( index = 0; index < sizeof(PALETTE); ++index ){
PPU_DATA = PALETTE[index];
}
PPU_ADDRESS = 0;
PPU_ADDRESS = 0;
SCROLL = 0;
SCROLL = 0;
Wait_Vblank();
PPU_CTRL = 0x90;
PPU_MASK = 0x1e;
while (1);
}
_Wait_Vblank:
lda $2002
bpl _Wait_Vblank
rts
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References
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http://nesdev.com/
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http://hp.vector.co.jp/authors/VA042397/inde
x.html
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https://nesdoug.com/
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https://en.wikibooks.org/wiki/6502_Assembl
y
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https://timcheeseman.com/nesdev