1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
extern crate core;
mod memory;
mod mos6502;
mod ppu;
mod cartridge;
mod mapper;
use std::fs::File;
use std::io::Read;
use core::cell::RefCell;
use core::intrinsics::transmute;
use cartridge::*;
extern crate sdl2;
use sdl2::pixels::Color;
use sdl2::rect::Rect;
use sdl2::event::Event;
use sdl2::keyboard::Keycode;
struct Window {
buff: RefCell<[[u8; 256]; 240]>
}
impl ppu::Screen for Window {
fn put(&self, x: u8, y: u8, color: u8) {
self.buff.borrow_mut()[y as usize][x as usize] = color;
}
fn render(&self) {
println!("a frame has been redrawn:");
for r in self.buff.borrow().iter() {
for c in r.iter() {
print!("{:02x}", c);
}
println!("");
}
}
}
struct SDLWindow {
canvas: RefCell<sdl2::render::WindowCanvas>,
events: RefCell<sdl2::EventPump>,
}
impl SDLWindow {
fn new() -> Self {
let sdl_context = sdl2::init().unwrap();
let video_subsystem = sdl_context.video().unwrap();
let window = video_subsystem.window("RuNES", 256 * PIXEL_SIZE, 240 * PIXEL_SIZE)
.position_centered()
.opengl()
.build()
.unwrap();
let mut canvas = window.into_canvas().build().unwrap();
canvas.set_draw_color(Color::RGB(255, 255, 255));
canvas.clear();
canvas.present();
SDLWindow {
canvas: RefCell::new(canvas),
events: RefCell::new(sdl_context.event_pump().unwrap())
}
}
fn poll(&self) -> bool {
for event in self.events.borrow_mut().poll_iter() {
match event {
Event::Quit {..} | Event::KeyDown { keycode: Some(Keycode::Escape), .. } => {
return true;
},
_ => ()
}
}
false
}
}
const PIXEL_SIZE: u32 = 4;
const COLORS: [u32; 64] = [
0x666666, 0x002A88, 0x1412A7, 0x3B00A4, 0x5C007E, 0x6E0040, 0x6C0600, 0x561D00,
0x333500, 0x0B4800, 0x005200, 0x004F08, 0x00404D, 0x000000, 0x000000, 0x000000,
0xADADAD, 0x155FD9, 0x4240FF, 0x7527FE, 0xA01ACC, 0xB71E7B, 0xB53120, 0x994E00,
0x6B6D00, 0x388700, 0x0C9300, 0x008F32, 0x007C8D, 0x000000, 0x000000, 0x000000,
0xFFFEFF, 0x64B0FF, 0x9290FF, 0xC676FF, 0xF36AFF, 0xFE6ECC, 0xFE8170, 0xEA9E22,
0xBCBE00, 0x88D800, 0x5CE430, 0x45E082, 0x48CDDE, 0x4F4F4F, 0x000000, 0x000000,
0xFFFEFF, 0xC0DFFF, 0xD3D2FF, 0xE8C8FF, 0xFBC2FF, 0xFEC4EA, 0xFECCC5, 0xF7D8A5,
0xE4E594, 0xCFEF96, 0xBDF4AB, 0xB3F3CC, 0xB5EBF2, 0xB8B8B8, 0x000000, 0x000000,
];
fn get_rgb(color: u8) -> Color {
let c = COLORS[color as usize];
Color::RGB((c >> 16) as u8, ((c >> 8) & 0xff) as u8, (c & 0xff) as u8)
}
impl ppu::Screen for SDLWindow {
fn put(&self, x: u8, y: u8, color: u8) {
let mut canvas = self.canvas.borrow_mut();
//println!("put {} at {}, {}", color, x, y);
canvas.set_draw_color(get_rgb(color));
canvas.fill_rect(Rect::new((x as u32 * PIXEL_SIZE) as i32,
(y as u32 * PIXEL_SIZE) as i32,
PIXEL_SIZE, PIXEL_SIZE));
}
fn render(&self) {
let mut canvas = self.canvas.borrow_mut();
canvas.present();
canvas.set_draw_color(Color::RGB(128, 128, 128));
canvas.clear();
}
}
#[repr(C, packed)]
struct INesHeader {
magic: [u8; 4],
prg_rom_nbanks: u8,
chr_rom_nbanks: u8,
flags6: u8,
flags7: u8,
prg_ram_nbanks: u8,
flags9: u8,
flags10: u8,
padding: [u8; 5]
}
fn main() {
let fname = std::env::args().nth(1).unwrap();
let mut file = File::open(fname).unwrap();
let mut rheader = [0; 16];
println!("read {}", file.read(&mut rheader[..]).unwrap());
let header = unsafe{transmute::<[u8; 16], INesHeader>(rheader)};
let mirror = match ((header.flags6 >> 2) & 2) | (header.flags6 & 1) {
0 => MirrorType::Horizontal,
1 => MirrorType::Vertical,
2 => MirrorType::Single0,
3 => MirrorType::Single1,
_ => MirrorType::Four,
};
let mapper_id = (header.flags7 & 0xf0) | (header.flags6 >> 4);
println!("maigc:{} prg:{} chr:{} mirror:{} mapper:{}",
std::str::from_utf8(&header.magic).unwrap(),
header.prg_rom_nbanks,
header.chr_rom_nbanks,
mirror as u8,
mapper_id);
if header.flags6 & 0x04 == 0x04 {
let mut trainer: [u8; 512] = unsafe{std::mem::uninitialized()};
file.read(&mut trainer[..]);
println!("skipping trainer");
}
let prg_len = header.prg_rom_nbanks as usize * 0x4000;
let mut chr_len = header.chr_rom_nbanks as usize * 0x2000;
if chr_len == 0 {
chr_len = 0x2000;
}
let mut prg_rom = Vec::<u8>::with_capacity(prg_len);
let mut chr_rom = Vec::<u8>::with_capacity(chr_len);
unsafe {
prg_rom.set_len(prg_len);
chr_rom.set_len(chr_len);
}
let sram = vec![0; 0x4000];
println!("read prg {}", file.read(&mut prg_rom[..]).unwrap());
for (i, v) in prg_rom.iter().enumerate() {
print!("{:02x} ", v);
if i & 15 == 15 {
println!(" {:04x}", i);
}
}
println!("read chr {}", file.read(&mut chr_rom[..]).unwrap());
for (i, v) in chr_rom.iter().enumerate() {
print!("{:02x} ", v);
if i & 15 == 15 {
println!("");
}
}
let cart = cartridge::Cartridge::new(chr_rom, prg_rom, sram, mirror);
//let win = Window {buff: RefCell::new([[0; 256]; 240])};
let win = SDLWindow::new();
let mapper = mapper::Mapper2::new(&cart);
let pmem = memory::PPUMemory::new(&mapper, &cart);
let mem = memory::CPUMemory::new(&mapper);
let mut ppu = ppu::PPU::new(&pmem, &win);
let mut cpu = mos6502::CPU::new(&mem);
mem.init(&mut cpu, &mut ppu);
let mut cnt = 0;
let mut cnt2 = 0;
let mut flag = false;
loop {
if win.poll() {break}
cpu.step();
//println!("cpu at 0x{:04x}", cpu.get_pc());
while cpu.cycle > 0 {
for _ in 0..3 {
cnt2 += 1;
if ppu.tick() {
println!("triggering nmi");
cpu.trigger_nmi();
}
if ppu.get_flag_vblank() {
if !flag {
println!("{} cpu {} ppu per frame", cnt, cnt2);
cnt2 = 0;
cnt = 0;
flag = true;
//pmem.dump();
}
} else {
flag = false;
}
}
cpu.cycle -= 1;
cnt += 1;
}
}
}
|