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João Magalhães authoredJoão Magalhães authored
main.rs 8.16 KiB
pub mod data;
pub mod util;
use boytacean::{
gb::GameBoy,
pad::PadKey,
ppu::{DISPLAY_HEIGHT, DISPLAY_WIDTH},
};
use sdl2::{event::Event, keyboard::Keycode, pixels::PixelFormatEnum};
use util::Graphics;
use crate::util::surface_from_bytes;
const VISUAL_HZ: u32 = 60;
const SCREEN_SCALE: f32 = 2.0;
/// The base title to be used in the window.
static TITLE: &'static str = "Boytacean";
pub struct Emulator {
system: GameBoy,
graphics: Graphics,
visual_frequency: u32,
next_tick_time: f32,
next_tick_time_i: u32,
}
impl Emulator {
pub fn new(system: GameBoy, screen_scale: f32) -> Self {
Self {
system: system,
graphics: Graphics::new(
TITLE,
DISPLAY_WIDTH as u32,
DISPLAY_HEIGHT as u32,
screen_scale,
),
visual_frequency: VISUAL_HZ,
next_tick_time: 0.0,
next_tick_time_i: 0,
}
}
pub fn run(&mut self) {
// updates the icon of the window to reflect the image
// and style of the emulator
let surface = surface_from_bytes(&data::ICON);
self.graphics.window_mut().set_icon(&surface);
// creates an accelerated canvas to be used in the drawing
// then clears it and presents it
self.graphics.canvas.present();
// creates a texture creator for the current canvas, required
// for the creation of dynamic and static textures
let texture_creator = self.graphics.canvas.texture_creator();
// creates the texture streaming that is going to be used
// as the target for the pixel buffer
let mut texture = texture_creator
.create_texture_streaming(
PixelFormatEnum::RGB24,
DISPLAY_WIDTH as u32,
DISPLAY_HEIGHT as u32,
)
.unwrap();
// allocates space for the loop ticks counter to be used in each
// iteration cycle
let mut counter = 0u32;
// the main loop to execute the multiple machine clocks, in
// theory the emulator should keep an infinite loop here
'main: loop {
// increments the counter that will keep track
// on the number of visual ticks since beginning
counter = counter.wrapping_add(1);
// obtains an event from the SDL sub-system to be
// processed under the current emulation context
while let Some(event) = self.graphics.event_pump.poll_event() {
match event {
Event::Quit { .. } => break 'main,
Event::KeyDown {
keycode: Some(keycode),
..
} => match key_to_pad(keycode) {
Some(key) => self.system.key_press(key),
None => (),
},
Event::KeyUp {
keycode: Some(keycode),
..
} => match key_to_pad(keycode) {
Some(key) => self.system.key_lift(key),
None => (),
},
Event::DropFile { filename, .. } => {
self.system.reset();
self.system.load_boot_default();
self.system.load_rom_file(&filename);
}
_ => (),
}
}
let current_time = self.graphics.timer_subsystem.ticks();
let mut counter_ticks = 0u32;
if current_time >= self.next_tick_time_i {
loop {
// limits the number of ticks to the typical number
// of ticks required to do a complete PPU draw
if counter_ticks >= 70224 {
break;
}
// runs the Game Boy clock, this operations should
// include the advance of both the CPU and the PPU
counter_ticks += self.system.clock() as u32;
}
// obtains the frame buffer of the Game Boy PPU and uses it
// to update the stream texture, copying it then to the canvas
let frame_buffer = self.system.frame_buffer().as_ref();
texture
.update(None, frame_buffer, DISPLAY_WIDTH as usize * 3)
.unwrap();
self.graphics.canvas.copy(&texture, None, None).unwrap();
// presents the canvas effectively updating the screen
// information presented to the user
self.graphics.canvas.present();
// updates the next update time reference to the current // time so that it can be used from game loop control
self.next_tick_time += 1000.0 / self.visual_frequency as f32;
self.next_tick_time_i = self.next_tick_time.ceil() as u32;
}
let current_time = self.graphics.timer_subsystem.ticks();
let pending_time = self.next_tick_time_i.saturating_sub(current_time);
self.graphics.timer_subsystem.delay(pending_time);
}
}
}
fn main() {
// creates a new Game Boy instance and loads both the boot ROM
// and the initial game ROM to "start the engine"
let mut game_boy = GameBoy::new();
game_boy.load_boot_default();
//let rom = game_boy.load_rom_file("../../res/roms.prop/tetris.gb");
//let rom = game_boy.load_rom_file("../../res/roms.prop/dr_mario.gb");
//let rom = game_boy.load_rom_file("../../res/roms.prop/alleyway.gb");
//let rom = game_boy.load_rom_file("../../res/roms.prop/super_mario.gb");
//let rom = game_boy.load_rom_file("../../res/roms.prop/super_mario_2.gb");
//let rom = game_boy.load_rom_file("../../res/roms.prop/pokemon_red.gb");
let rom = game_boy.load_rom_file("../../res/roms.prop/zelda.gb");
//let rom = game_boy.load_rom_file("../../res/roms/firstwhite.gb");
//let rom = game_boy.load_rom_file("../../res/roms/opus5.gb");
//let rom = game_boy.load_rom_file("../../res/roms/paradius/cpu/cpu_instrs.gb"); // PASSED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/interrupt_time/interrupt_time.gb"); // FAILED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/instr_timing/instr_timing.gb"); // PASSED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/mem_timing/mem_timing.gb"); // FAILED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/cpu/01-special.gb"); // PASSED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/cpu/02-interrupts.gb"); // PASSED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/cpu/03-op sp,hl.gb"); // PASSED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/cpu/04-op r,imm.gb"); // PASSED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/cpu/05-op rp.gb"); // PASSED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/cpu/06-ld r,r.gb"); // PASSED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/cpu/07-jr,jp,call,ret,rst.gb"); // PASSED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/cpu/08-misc instrs.gb"); // PASSED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/cpu/09-op r,r.gb"); // PASSED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/cpu/10-bit ops.gb"); // PASSED
//let rom = game_boy.load_rom_file("../../res/roms/paradius/cpu/11-op a,(hl).gb"); // PASSED
println!("==== Cartridge ====\n{}\n===================", rom);
let mut emulator = Emulator::new(game_boy, SCREEN_SCALE);
emulator.run();
}
fn key_to_pad(keycode: Keycode) -> Option<PadKey> {
match keycode {
Keycode::Up => Some(PadKey::Up),
Keycode::Down => Some(PadKey::Down),
Keycode::Left => Some(PadKey::Left),
Keycode::Right => Some(PadKey::Right),
Keycode::Return => Some(PadKey::Start),
Keycode::Return2 => Some(PadKey::Start),
Keycode::Space => Some(PadKey::Select),
Keycode::A => Some(PadKey::A),
Keycode::S => Some(PadKey::B),
_ => None,
}
}