From 12f97b8d5bec289f25db2d0976038ab4d6ec44a5 Mon Sep 17 00:00:00 2001
From: EliseZeroTwo <mail@elise.moe>
Date: Wed, 24 Nov 2021 12:01:25 +0100
Subject: [PATCH] feat: basic ppu

---
 .gitignore                |    3 +
 Cargo.lock                | 1913 +++++++++++++++++++++++++++++++++++++
 Cargo.toml                |   20 +
 config.example.toml       |   11 +
 rustfmt.toml              |    7 +
 src/gameboy.rs            |  232 +++++
 src/gameboy/interrupts.rs |   38 +
 src/gameboy/joypad.rs     |   62 ++
 src/gameboy/mapper.rs     |   37 +
 src/gameboy/memory.rs     |   13 +
 src/gameboy/ppu.rs        |  365 +++++++
 src/gameboy/timer.rs      |   87 ++
 src/main.rs               |  125 +++
 src/settings.rs           |   29 +
 src/window.rs             |  171 ++++
 15 files changed, 3113 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 config.example.toml
 create mode 100644 rustfmt.toml
 create mode 100644 src/gameboy.rs
 create mode 100644 src/gameboy/interrupts.rs
 create mode 100644 src/gameboy/joypad.rs
 create mode 100644 src/gameboy/mapper.rs
 create mode 100644 src/gameboy/memory.rs
 create mode 100644 src/gameboy/ppu.rs
 create mode 100644 src/gameboy/timer.rs
 create mode 100644 src/main.rs
 create mode 100644 src/settings.rs
 create mode 100644 src/window.rs

diff --git a/.gitignore b/.gitignore
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index 0000000..335122a
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..ccc7b85
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+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "winit"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "79610794594d5e86be473ef7763f604f2159cbac8c94debd00df8fb41e86c2f8"
+dependencies = [
+ "bitflags",
+ "cocoa",
+ "core-foundation 0.9.2",
+ "core-graphics 0.22.3",
+ "core-video-sys",
+ "dispatch",
+ "instant",
+ "lazy_static",
+ "libc",
+ "log",
+ "mio",
+ "mio-misc",
+ "ndk",
+ "ndk-glue",
+ "ndk-sys",
+ "objc",
+ "parking_lot",
+ "percent-encoding",
+ "raw-window-handle",
+ "scopeguard",
+ "serde 1.0.130",
+ "smithay-client-toolkit",
+ "wayland-client",
+ "winapi",
+ "x11-dl",
+]
+
+[[package]]
+name = "winit_input_helper"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8d8af691f04e6d8a892e80a2176221b2c13d5832a8929d8c0fed1e3e3d4fe831"
+dependencies = [
+ "winit",
+]
+
+[[package]]
+name = "x11-dl"
+version = "2.19.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea26926b4ce81a6f5d9d0f3a0bc401e5a37c6ae14a1bfaa8ff6099ca80038c59"
+dependencies = [
+ "lazy_static",
+ "libc",
+ "pkg-config",
+]
+
+[[package]]
+name = "xcursor"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "463705a63313cd4301184381c5e8042f0a7e9b4bb63653f216311d4ae74690b7"
+dependencies = [
+ "nom 7.1.0",
+]
+
+[[package]]
+name = "xdg"
+version = "2.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3a23fe958c70412687039c86f578938b4a0bb50ec788e96bce4d6ab00ddd5803"
+dependencies = [
+ "dirs",
+]
+
+[[package]]
+name = "xml-rs"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2d7d3948613f75c98fd9328cfdcc45acc4d360655289d0a7d4ec931392200a3"
+
+[[package]]
+name = "yaml-rust"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56c1936c4cc7a1c9ab21a1ebb602eb942ba868cbd44a99cb7cdc5892335e1c85"
+dependencies = [
+ "linked-hash-map",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..9fa813f
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "deemgee"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+argh = "0.1.6"
+chrono = "0.4.19"
+config = "0.11.0"
+env_logger = "0.9.0"
+log = "0.4.14"
+paste = "1.0.6"
+pixels = "0.7.0"
+serde = { version = "1.0.130", features = ["derive"] }
+sha1 = { version = "0.6.0", features = ["std"] }
+thiserror = "1.0.30"
+winit = { version = "0.25.0", features = ["serde"] }
+winit_input_helper = "0.10.0"
diff --git a/config.example.toml b/config.example.toml
new file mode 100644
index 0000000..c86f3db
--- /dev/null
+++ b/config.example.toml
@@ -0,0 +1,11 @@
+[bindings]
+a = "A"
+b = "S"
+select = "Q"
+start = "W"
+up = "Up"
+down = "Down"
+left = "Left"
+right = "Right"
+pause = "P"
+exit = "Escape"
\ No newline at end of file
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..11a295d
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1,7 @@
+hard_tabs=true
+max_width = 100
+comment_width = 80
+wrap_comments = true
+imports_granularity = "Crate"
+use_small_heuristics = "Max"
+group_imports = "StdExternalCrate"
diff --git a/src/gameboy.rs b/src/gameboy.rs
new file mode 100644
index 0000000..25c26e1
--- /dev/null
+++ b/src/gameboy.rs
@@ -0,0 +1,232 @@
+mod interrupts;
+mod joypad;
+mod mapper;
+mod memory;
+mod ppu;
+mod timer;
+
+use interrupts::Interrupts;
+use joypad::Joypad;
+use mapper::Mapper;
+use memory::Memory;
+use ppu::Ppu;
+use timer::Timer;
+
+pub struct DmaState {
+	pub base: u8,
+	pub remaining_cycles: u8,
+	pub remaining_delay: u8,
+}
+
+impl DmaState {
+	pub fn new() -> Self {
+		Self { base: 0, remaining_cycles: 0, remaining_delay: 0 }
+	}
+
+	pub fn init_request(&mut self, base: u8) {
+		self.base = base;
+		self.remaining_cycles = 0xA0;
+		self.remaining_delay = 2;
+	}
+}
+
+pub struct Gameboy {
+	pub ppu: Ppu,
+	memory: Memory,
+	cartridge: Option<Box<dyn Mapper>>,
+	interrupts: Interrupts,
+	timer: Timer,
+	pub joypad: Joypad,
+	pub dma: DmaState,
+}
+
+impl Gameboy {
+	pub fn new(bootrom: [u8; 0x100]) -> Self {
+		Self {
+			memory: Memory::new(bootrom),
+			cartridge: None,
+			interrupts: Interrupts::new(),
+			timer: Timer::new(),
+			joypad: Joypad::new(),
+			dma: DmaState::new(),
+			ppu: Ppu::new(),
+		}
+	}
+
+	pub fn tick(&mut self) -> bool {
+		if self.timer.tick() {
+			self.interrupts.write_if_timer(true);
+		}
+
+		self.tick_cpu();
+		let redraw_requested = self.ppu.tick(&mut self.interrupts);
+		self.tick_dma();
+		redraw_requested
+	}
+
+	fn tick_cpu(&mut self) {}
+
+	fn tick_dma(&mut self) {
+		if self.dma.remaining_delay > 0 {
+			self.dma.remaining_delay -= 1;
+		} else if self.dma.remaining_cycles > 0 {
+			let offset = 0xA0 - self.dma.remaining_cycles;
+
+			let value = if self.dma.base <= 0x7F {
+				match self.cartridge.as_ref() {
+					Some(cart) => cart.read_rom_u8((self.dma.base as u16) << 8 | offset as u16),
+					None => 0xFF,
+				}
+			} else if self.dma.base <= 0x9F {
+				self.ppu.dma_read_vram(offset)
+			} else {
+				0xFF
+			};
+
+			self.ppu.dma_write_oam(offset, value);
+			self.dma.remaining_cycles -= 1;
+		}
+	}
+
+	fn cpu_read_io(&self, address: u16) -> u8 {
+		match address {
+			0xFF00 => self.joypad.cpu_read(),
+			0xFF01..=0xFF02 => unimplemented!("Serial"),
+			0xFF03 => 0, // Unused
+			0xFF04 => self.timer.div,
+			0xFF05 => self.timer.tima,
+			0xFF06 => self.timer.tma,
+			0xFF07 => self.timer.read_tac(),
+			0xFF08..=0xFF0E => 0, // Unused
+			0xFF0F => self.interrupts.interrupt_enable,
+			0xFF10..=0xFF3F => unimplemented!("Sound IO"),
+			0xFF40 => self.ppu.lcdc,
+			0xFF41 => self.ppu.stat,
+			0xFF42 => self.ppu.scy,
+			0xFF43 => self.ppu.scx,
+			0xFF44 => self.ppu.ly,
+			0xFF45 => self.ppu.lyc,
+			0xFF46 => self.dma.base,
+			0xFF47..=0xFF49 => 0,
+			0xFF4A => self.ppu.wy,
+			0xFF4B => self.ppu.wx,
+			0xFF4C..=0xFF4E => 0, // Unused
+			0xFF4F => 0,          // CGB VRAM Bank Select
+			0xFF50 => self.memory.bootrom_disabled as u8,
+			0xFF51..=0xFF55 => 0, // CGB VRAM DMA
+			0xFF56..=0xFF67 => 0, // Unused
+			0xFF68..=0xFF69 => 0, // BJ/OBJ Palettes
+			0xFF6A..=0xFF6F => 0, // Unused
+			0xFF70 => 0,          // CGB WRAM Bank Select
+			0xFF71..=0xFF7F => 0, // Unused
+			_ => unreachable!("IO Read Invalid"),
+		}
+	}
+
+	fn cpu_write_io(&mut self, address: u16, value: u8) {
+		match address {
+			0xFF00 => self.joypad.cpu_write(value),
+			0xFF01..=0xFF02 => unimplemented!("Serial"),
+			0xFF03 => {} // Unused
+			0xFF04 => self.timer.div = value,
+			0xFF05 => self.timer.tima = value,
+			0xFF06 => self.timer.tma = value,
+			0xFF07 => self.timer.write_tac(value),
+			0xFF08..=0xFF0E => {} // Unused
+			0xFF0F => self.interrupts.interrupt_enable = value & 0b1_1111,
+			0xFF10..=0xFF3F => unimplemented!("Sound IO"),
+			0xFF40 => self.ppu.lcdc = value,
+			0xFF41 => self.ppu.cpu_write_stat(value),
+			0xFF42 => self.ppu.scy = value,
+			0xFF43 => self.ppu.scx = value,
+			0xFF44 => {} // LY is read only
+			0xFF45 => self.ppu.lyc = value,
+			0xFF46 => {
+				if self.dma.remaining_cycles == 0 {
+					self.dma.init_request(value);
+				}
+			}
+			0xFF47..=0xFF49 => {}
+			0xFF4A => self.ppu.wy = value,
+			0xFF4B => self.ppu.wx = value,
+			0xFF4C..=0xFF4E => {} // Unused
+			0xFF4F => {}          // CGB VRAM Bank Select
+			0xFF50 => {
+				if value & 0b1 == 1 {
+					self.memory.bootrom_disabled = true;
+				}
+			}
+			0xFF51..=0xFF55 => {} // CGB VRAM DMA
+			0xFF56..=0xFF67 => {} // Unused
+			0xFF68..=0xFF69 => {} // CGB BG/OBJ Palettes
+			0xFF6A..=0xFF6F => {} // Unused
+			0xFF70 => {}          // CGB WRAM Bank Select
+			0xFF71..=0xFF7F => {} // Unused
+			_ => unreachable!("IO Read Invalid"),
+		}
+	}
+
+	pub fn cpu_read_u8(&self, address: u16) -> u8 {
+		if self.dma.remaining_cycles == 0 {
+			match address {
+				0..=0xFF if !self.memory.bootrom_disabled => self.memory.bootrom[address as usize],
+				0..=0x7FFF => match self.cartridge.as_ref() {
+					Some(mapper) => mapper.read_rom_u8(address),
+					None => 0,
+				},
+				0x8000..=0x9FFF => self.ppu.cpu_read_vram(address),
+				0xA000..=0xBFFF => match self.cartridge.as_ref() {
+					Some(mapper) => mapper.read_eram_u8(address),
+					None => 0,
+				},
+				0xC000..=0xDFFF => self.memory.wram[address as usize - 0xC000],
+				0xE000..=0xFDFF => self.memory.wram[address as usize - 0xE000],
+				0xFE00..=0xFE9F => self.ppu.cpu_read_oam(address),
+				0xFEA0..=0xFEFF => 0,
+				0xFF00..=0xFF7F => self.cpu_read_io(address),
+				0xFF80..=0xFFFE => self.memory.hram[address as usize - 0xFF80],
+				0xFFFF => self.interrupts.interrupt_enable,
+			}
+		} else {
+			match address {
+				0..=0xFEFF => 0,
+				0xFF00..=0xFF7F => self.cpu_read_io(address),
+				0xFF80..=0xFFFE => self.memory.hram[address as usize - 0xFF80],
+				0xFFFF => self.interrupts.interrupt_enable,
+			}
+		}
+	}
+
+	pub fn cpu_write_u8(&mut self, address: u16, value: u8) {
+		if self.dma.remaining_cycles == 0 {
+			match address {
+				0..=0xFF if !self.memory.bootrom_disabled => {}
+				0..=0x7FFF => {
+					if let Some(mapper) = self.cartridge.as_mut() {
+						mapper.write_rom_u8(address, value)
+					}
+				}
+				0x8000..=0x9FFF => self.ppu.cpu_write_vram(address, value),
+				0xA000..=0xBFFF => {
+					if let Some(mapper) = self.cartridge.as_mut() {
+						mapper.write_eram_u8(address, value)
+					}
+				}
+				0xC000..=0xDFFF => self.memory.wram[address as usize - 0xC000] = value,
+				0xE000..=0xFDFF => self.memory.wram[address as usize - 0xE000] = value,
+				0xFE00..=0xFE9F => self.ppu.cpu_write_oam(address, value),
+				0xFEA0..=0xFEFF => {}
+				0xFF00..=0xFF7F => self.cpu_write_io(address, value),
+				0xFF80..=0xFFFE => self.memory.hram[address as usize - 0xFF80] = value,
+				0xFFFF => self.interrupts.interrupt_enable = value & 0b1_1111,
+			}
+		} else {
+			match address {
+				0..=0xFEFF => {}
+				0xFF00..=0xFF7F => self.cpu_write_io(address, value),
+				0xFF80..=0xFFFE => self.memory.hram[address as usize - 0xFF80] = value,
+				0xFFFF => self.interrupts.interrupt_enable = value & 0b1_1111,
+			}
+		}
+	}
+}
diff --git a/src/gameboy/interrupts.rs b/src/gameboy/interrupts.rs
new file mode 100644
index 0000000..ebe996a
--- /dev/null
+++ b/src/gameboy/interrupts.rs
@@ -0,0 +1,38 @@
+macro_rules! define_bitfield_u8_gs {
+	($name:ident, $offset:literal, $loc:ident) => {
+		paste::paste! {
+			pub fn [<read_ $name>](&self) -> bool {
+				((self.$loc >> $offset) & 0b1) == 1
+			}
+
+			pub fn [<write_ $name>](&mut self, value: bool) {
+				log::debug!(std::concat!("Setting ", std::stringify!($name), " to {}"), value);
+				self.$loc &= !(0b1 << $offset);
+				self.$loc |= (value as u8) << $offset;
+			}
+		}
+	};
+}
+
+pub struct Interrupts {
+	pub ime: bool,
+	pub interrupt_enable: u8,
+	pub interrupt_flag: u8,
+}
+
+impl Interrupts {
+	pub fn new() -> Self {
+		Self { ime: true, interrupt_enable: 0b1_1111, interrupt_flag: 0b0_0000 }
+	}
+
+	define_bitfield_u8_gs!(ie_vblank, 0, interrupt_enable);
+	define_bitfield_u8_gs!(ie_lcd_stat, 1, interrupt_enable);
+	define_bitfield_u8_gs!(ie_timer, 2, interrupt_enable);
+	define_bitfield_u8_gs!(ie_serial, 3, interrupt_enable);
+	define_bitfield_u8_gs!(ie_joypad, 4, interrupt_enable);
+	define_bitfield_u8_gs!(if_vblank, 0, interrupt_flag);
+	define_bitfield_u8_gs!(if_lcd_stat, 1, interrupt_flag);
+	define_bitfield_u8_gs!(if_timer, 2, interrupt_flag);
+	define_bitfield_u8_gs!(if_serial, 3, interrupt_flag);
+	define_bitfield_u8_gs!(if_joypad, 4, interrupt_flag);
+}
diff --git a/src/gameboy/joypad.rs b/src/gameboy/joypad.rs
new file mode 100644
index 0000000..e55d4ce
--- /dev/null
+++ b/src/gameboy/joypad.rs
@@ -0,0 +1,62 @@
+#[derive(Debug, PartialEq, Eq)]
+pub enum JoypadMode {
+	Action,
+	Direction,
+}
+
+pub struct Joypad {
+	mode: JoypadMode,
+	pub down: bool,
+	pub up: bool,
+	pub left: bool,
+	pub right: bool,
+	pub start: bool,
+	pub select: bool,
+	pub b: bool,
+	pub a: bool,
+}
+
+impl Joypad {
+	pub fn new() -> Self {
+		Self {
+			mode: JoypadMode::Action,
+			down: false,
+			up: false,
+			left: false,
+			right: false,
+			start: false,
+			select: false,
+			b: false,
+			a: false,
+		}
+	}
+
+	pub fn cpu_read(&self) -> u8 {
+		match self.mode {
+			JoypadMode::Action => {
+				(1 << 4)
+					| ((!self.start as u8) << 3)
+					| ((!self.select as u8) << 2)
+					| ((!self.b as u8) << 1)
+					| (!self.a as u8)
+			}
+			JoypadMode::Direction => {
+				(1 << 5)
+					| ((!self.down as u8) << 3)
+					| ((!self.up as u8) << 2)
+					| ((!self.left as u8) << 1)
+					| (!self.right as u8)
+			}
+		}
+	}
+
+	pub fn cpu_write(&mut self, content: u8) {
+		if (content >> 5) & 0b1 == 0 {
+			self.mode = JoypadMode::Action;
+		}
+
+		if (content >> 4) & 0b1 == 0 {
+			self.mode = JoypadMode::Direction;
+		}
+	}
+}
diff --git a/src/gameboy/mapper.rs b/src/gameboy/mapper.rs
new file mode 100644
index 0000000..59e8dea
--- /dev/null
+++ b/src/gameboy/mapper.rs
@@ -0,0 +1,37 @@
+pub trait Mapper {
+	fn read_rom_u8(&self, address: u16) -> u8;
+	fn write_rom_u8(&mut self, address: u16, value: u8);
+
+	fn read_eram_u8(&self, address: u16) -> u8;
+	fn write_eram_u8(&mut self, address: u16, value: u8);
+}
+
+pub struct NoMBC {
+	rom: [u8; 0x8000],
+	ram: Option<[u8; 0x2000]>,
+}
+
+impl Mapper for NoMBC {
+	fn read_rom_u8(&self, address: u16) -> u8 {
+		self.rom[address as usize]
+	}
+
+	fn write_rom_u8(&mut self, address: u16, value: u8) {
+		self.rom[address as usize] = value
+	}
+
+	fn read_eram_u8(&self, address: u16) -> u8 {
+		let decoded_address = address - 0xA000;
+		match &self.ram {
+			Some(ram) => ram[decoded_address as usize],
+			None => 0,
+		}
+	}
+
+	fn write_eram_u8(&mut self, address: u16, value: u8) {
+		let decoded_address = address - 0xA000;
+		if let Some(ram) = &mut self.ram {
+			ram[decoded_address as usize] = value;
+		}
+	}
+}
diff --git a/src/gameboy/memory.rs b/src/gameboy/memory.rs
new file mode 100644
index 0000000..4a4b772
--- /dev/null
+++ b/src/gameboy/memory.rs
@@ -0,0 +1,13 @@
+pub struct Memory {
+	pub wram: [u8; 0x2000],
+	pub hram: [u8; 0xAF],
+
+	pub bootrom_disabled: bool,
+	pub bootrom: [u8; 0x100],
+}
+
+impl Memory {
+	pub fn new(bootrom: [u8; 0x100]) -> Self {
+		Self { wram: [0; 0x2000], hram: [0; 0xAF], bootrom, bootrom_disabled: false }
+	}
+}
diff --git a/src/gameboy/ppu.rs b/src/gameboy/ppu.rs
new file mode 100644
index 0000000..e89851a
--- /dev/null
+++ b/src/gameboy/ppu.rs
@@ -0,0 +1,365 @@
+use std::ops::{Index, IndexMut};
+
+use crate::{gameboy::Interrupts, window::FB_WIDTH};
+
+pub struct WrappedBuffer<const SIZE: usize>([u8; SIZE]);
+
+impl<const SIZE: usize> Index<usize> for WrappedBuffer<SIZE> {
+	type Output = u8;
+
+	fn index(&self, index: usize) -> &Self::Output {
+		&self.0[index % SIZE]
+	}
+}
+
+impl<const SIZE: usize> IndexMut<usize> for WrappedBuffer<SIZE> {
+	fn index_mut(&mut self, index: usize) -> &mut Self::Output {
+		&mut self.0[index % SIZE]
+	}
+}
+
+impl<const SIZE: usize> WrappedBuffer<SIZE> {
+	pub fn empty() -> Self {
+		Self([0; SIZE])
+	}
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum PPUMode {
+	HBlank,
+	VBlank,
+	SearchingOAM,
+	TransferringData,
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum Color {
+	White,
+	LGray,
+	DGray,
+	Black,
+	Transparent,
+}
+
+impl Color {
+	pub fn rgba(self) -> &'static [u8; 4] {
+		match self {
+			Color::White => &[0x7F, 0x86, 0x0F, 0xFF],
+			Color::LGray => &[0x57, 0x7c, 0x44, 0xFF],
+			Color::DGray => &[0x36, 0x5d, 0x48, 0xFF],
+			Color::Black => &[0x2a, 0x45, 0x3b, 0xFF],
+			Color::Transparent => &[0x00, 0x00, 0x00, 0x00],
+		}
+	}
+
+	pub fn parse_bgp_color(color: u8) -> Self {
+		match color & 0b11 {
+			0 => Self::White,
+			1 => Self::LGray,
+			2 => Self::DGray,
+			3 => Self::Black,
+			_ => unreachable!(),
+		}
+	}
+
+	pub fn parse_obp_color(color: u8) -> Self {
+		match color & 0b11 {
+			0 => Self::Transparent,
+			1 => Self::LGray,
+			2 => Self::DGray,
+			3 => Self::Black,
+			_ => unreachable!(),
+		}
+	}
+
+	pub fn parse_bgp(mut bgp: u8) -> [Self; 4] {
+		let mut out = [Self::White, Self::White, Self::White, Self::White];
+		for color in &mut out {
+			*color = Self::parse_bgp_color(bgp);
+			bgp >>= 2;
+		}
+		out.reverse();
+		out
+	}
+
+	pub fn parse_obp(mut obp: u8) -> [Self; 4] {
+		let mut out = [Self::Transparent, Self::Transparent, Self::Transparent, Self::Transparent];
+		for color in &mut out {
+			*color = Self::parse_obp_color(obp);
+			obp >>= 2;
+		}
+		out.reverse();
+		out
+	}
+}
+
+impl PPUMode {
+	pub fn mode_flag(&self) -> u8 {
+		match self {
+			PPUMode::HBlank => 0,
+			PPUMode::VBlank => 1,
+			PPUMode::SearchingOAM => 2,
+			PPUMode::TransferringData => 3,
+		}
+	}
+
+	pub fn from_mode_flag(value: u8) -> Self {
+		match value & 0b11 {
+			0 => Self::HBlank,
+			1 => Self::VBlank,
+			2 => Self::SearchingOAM,
+			3 => Self::TransferringData,
+			_ => unreachable!(),
+		}
+	}
+}
+
+pub struct Ppu {
+	pub lcdc: u8,
+	pub stat: u8,
+	pub scy: u8,
+	pub scx: u8,
+	pub ly: u8,
+	pub lyc: u8,
+	pub wy: u8,
+	pub wx: u8,
+	pub vram: [u8; 0x2000],
+	pub oam: [u8; 0xA0],
+	pub cycle_counter: u16,
+	pub bgp: u8,
+	pub obp: u8,
+
+	pub framebuffer: WrappedBuffer<{ 160 * 144 * 4 }>,
+	pub sprite_framebuffer: WrappedBuffer<{ 160 * 144 * 4 }>,
+}
+
+impl Ppu {
+	pub fn new() -> Self {
+		Self {
+			lcdc: 0b1000_0000,
+			stat: 0b0000_0010,
+			scy: 0,
+			scx: 0,
+			ly: 0,
+			lyc: 0,
+			wy: 0,
+			wx: 0,
+			vram: [0; 0x2000],
+			oam: [0; 0xA0],
+			cycle_counter: 0,
+			framebuffer: WrappedBuffer::empty(),
+			sprite_framebuffer: WrappedBuffer::empty(),
+			bgp: 0,
+			obp: 0,
+		}
+	}
+
+	fn set_scanline(&mut self, interrupts: &mut Interrupts, scanline: u8) {
+		self.ly = scanline;
+
+		self.stat &= !(1 << 2);
+		if self.ly == self.lyc {
+			self.stat |= 1 << 2;
+
+			if (self.stat >> 6) & 0b1 == 1 {
+				interrupts.write_if_lcd_stat(true);
+			}
+		}
+	}
+
+	fn draw_line(&mut self) {
+		for pixel_idx in 0..FB_WIDTH as u8 {
+			let scrolled_x = pixel_idx.overflowing_add(self.scx).0 as usize;
+			let scrolled_y = self.ly.overflowing_add(self.scy).0 as usize;
+			let tilemap_idx = scrolled_x / 8 + ((scrolled_y as usize / 8) * 32);
+			let tilemap_value = self.read_tile_map()[tilemap_idx];
+
+			let color = Self::parse_tile_color(
+				self.read_tile(tilemap_value),
+				scrolled_x % 8,
+				scrolled_y % 8,
+			);
+			let dest_idx_base = ((self.scy as usize * FB_WIDTH as usize) + pixel_idx as usize) * 4;
+			for (idx, byte) in color.rgba().iter().enumerate() {
+				self.framebuffer[dest_idx_base + idx] = *byte;
+			}
+		}
+	}
+
+	fn parse_tile_color(tile: &[u8], x: usize, y: usize) -> Color {
+		assert!(x < 8);
+		if x < 4 {
+			let bitshift = 6 - x * 2;
+			Color::parse_bgp_color(tile[y * 2] >> bitshift)
+		} else {
+			let x = x - 4;
+			let bitshift = 6 - x * 2;
+			Color::parse_bgp_color(tile[(y * 2) + 1] >> bitshift)
+		}
+	}
+
+	fn set_mode(&mut self, interrupts: &mut Interrupts, mode: PPUMode) {
+		log::debug!("PPU switching mode to {:?} @ {}", mode, self.cycle_counter);
+		self.stat &= !0b11;
+		self.stat |= mode.mode_flag();
+		self.cycle_counter = 0;
+
+		let offset = match mode {
+			PPUMode::HBlank => 3,
+			PPUMode::VBlank => 4,
+			PPUMode::SearchingOAM => 5,
+			_ => return,
+		};
+
+		if (self.stat >> offset) & 0b1 == 1 {
+			interrupts.write_if_lcd_stat(true);
+		}
+
+		if mode == PPUMode::VBlank {
+			interrupts.write_if_vblank(true);
+		}
+	}
+
+	pub fn write_fb(&self) -> Vec<u8> {
+		let mut out = self.framebuffer.0.to_vec();
+
+		for x in 0..(160 * 144) {
+			let idx = x * 4;
+
+			let (r, g, b, a) = (
+				self.sprite_framebuffer[idx],
+				self.sprite_framebuffer[idx + 1],
+				self.sprite_framebuffer[idx + 2],
+				self.sprite_framebuffer[idx + 3],
+			);
+
+			if r != 0 || g != 0 || b != 0 || a != 0 {
+				out[idx] = r;
+				out[idx + 1] = g;
+				out[idx + 2] = b;
+				out[idx + 3] = a;
+			}
+		}
+
+		out
+	}
+
+	pub fn tick(&mut self, interrupts: &mut Interrupts) -> bool {
+		let res = match self.mode() {
+			PPUMode::HBlank => {
+				if self.cycle_counter >= 120 {
+					self.set_scanline(interrupts, self.ly + 1);
+
+					let next_mode = match self.ly > 143 {
+						true => PPUMode::VBlank,
+						false => PPUMode::SearchingOAM,
+					};
+					self.set_mode(interrupts, next_mode);
+				}
+				false
+			}
+			PPUMode::VBlank => {
+				if self.cycle_counter % 506 == 0 {
+					if self.ly >= 153 {
+						self.set_scanline(interrupts, 0);
+						self.set_mode(interrupts, PPUMode::SearchingOAM);
+						true
+					} else {
+						self.set_scanline(interrupts, self.ly + 1);
+						false
+					}
+				} else {
+					false
+				}
+			}
+			PPUMode::SearchingOAM => {
+				if self.cycle_counter >= 80 {
+					self.set_mode(interrupts, PPUMode::TransferringData);
+				}
+				false
+			}
+			PPUMode::TransferringData => {
+				if self.cycle_counter >= 170 {
+					self.draw_line();
+					self.set_mode(interrupts, PPUMode::HBlank);
+				}
+				false
+			}
+		};
+
+		self.cycle_counter += 1;
+
+		res
+	}
+
+	pub fn mode(&self) -> PPUMode {
+		PPUMode::from_mode_flag(self.stat)
+	}
+
+	pub fn cpu_read_oam(&self, address: u16) -> u8 {
+		let decoded_address = address - 0xFE00;
+		match self.mode() {
+			PPUMode::HBlank | PPUMode::VBlank => self.oam[decoded_address as usize],
+			PPUMode::SearchingOAM | PPUMode::TransferringData => 0xFF,
+		}
+	}
+
+	pub fn dma_write_oam(&mut self, offset: u8, value: u8) {
+		self.oam[offset as usize] = value;
+	}
+
+	pub fn cpu_write_oam(&mut self, address: u16, value: u8) {
+		let decoded_address = address - 0xFE00;
+		match self.mode() {
+			PPUMode::HBlank | PPUMode::VBlank => self.oam[decoded_address as usize] = value,
+			_ => {}
+		}
+	}
+
+	pub fn dma_read_vram(&mut self, offset: u8) -> u8 {
+		self.vram[offset as usize]
+	}
+
+	pub fn cpu_read_vram(&self, address: u16) -> u8 {
+		let decoded_address = address - 0x8000;
+		match self.mode() {
+			PPUMode::HBlank | PPUMode::VBlank | PPUMode::SearchingOAM => {
+				self.vram[decoded_address as usize]
+			}
+			PPUMode::TransferringData => 0xFF,
+		}
+	}
+
+	pub fn cpu_write_vram(&mut self, address: u16, value: u8) {
+		let decoded_address = address - 0x8000;
+		match self.mode() {
+			PPUMode::HBlank | PPUMode::VBlank | PPUMode::SearchingOAM => {
+				self.vram[decoded_address as usize] = value
+			}
+			_ => {}
+		}
+	}
+
+	pub fn cpu_write_stat(&mut self, value: u8) {
+		self.stat = value & 0b0111_1000;
+	}
+
+	pub fn read_tile(&self, obj: u8) -> &[u8] {
+		if (self.lcdc >> 4) & 0b1 == 1 {
+			&self.vram[obj as usize * 16..((obj as usize + 1) * 16)]
+		} else if obj < 128 {
+			&self.vram[0x1000 + (obj as usize * 16)..0x1000 + ((obj as usize + 1) * 16)]
+		} else {
+			let adjusted_obj = obj - 128;
+			&self.vram
+				[0x800 + (adjusted_obj as usize * 16)..0x800 + ((adjusted_obj as usize + 1) * 16)]
+		}
+	}
+
+	pub fn read_tile_map(&self) -> &[u8] {
+		match (self.lcdc >> 3) & 0b1 == 1 {
+			true => &self.vram[0x1C00..=0x1FFF],
+			false => &self.vram[0x1800..=0x1BFF],
+		}
+	}
+}
diff --git a/src/gameboy/timer.rs b/src/gameboy/timer.rs
new file mode 100644
index 0000000..3310ce8
--- /dev/null
+++ b/src/gameboy/timer.rs
@@ -0,0 +1,87 @@
+pub struct Timer {
+	pub enable: bool,
+	pub clock: TimerClock,
+	pub div: u8,
+	pub div_counter: u8,
+	pub tima: u8,
+	pub tima_counter: u16,
+	pub tma: u8,
+}
+
+impl Timer {
+	pub fn new() -> Self {
+		Self {
+			enable: false,
+			clock: TimerClock::C1024,
+			tima: 0,
+			tma: 0,
+			div: 0,
+			div_counter: 0,
+			tima_counter: 0,
+		}
+	}
+
+	pub fn tick(&mut self) -> bool {
+		self.div_counter = self.div_counter.overflowing_add(1).0;
+		if self.div_counter == 0 {
+			self.div = self.div.overflowing_add(1).0;
+		}
+
+		if self.enable {
+			self.tima_counter = self.tima_counter.overflowing_add(1).0;
+			if self.tima_counter >= self.clock.cycles() {
+				self.tima += self.tima.overflowing_add(1).0;
+
+				return self.tima == 0;
+			}
+		}
+		false
+	}
+
+	pub fn read_tac(&self) -> u8 {
+		((self.enable as u8) << 2) | self.clock.tac_clock()
+	}
+
+	pub fn write_tac(&mut self, value: u8) {
+		self.enable = (value >> 2) & 0b1 == 1;
+		self.clock = TimerClock::from_tac_clock(value);
+	}
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum TimerClock {
+	C16,
+	C64,
+	C256,
+	C1024,
+}
+
+impl TimerClock {
+	pub fn cycles(&self) -> u16 {
+		match self {
+			Self::C16 => 16,
+			Self::C64 => 64,
+			Self::C256 => 256,
+			Self::C1024 => 1024,
+		}
+	}
+
+	pub fn tac_clock(&self) -> u8 {
+		match self {
+			Self::C16 => 1,
+			Self::C64 => 2,
+			Self::C256 => 3,
+			Self::C1024 => 0,
+		}
+	}
+
+	pub fn from_tac_clock(value: u8) -> Self {
+		match value & 0b11 {
+			1 => Self::C16,
+			2 => Self::C64,
+			3 => Self::C256,
+			4 => Self::C1024,
+			_ => unreachable!(),
+		}
+	}
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..16ff297
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,125 @@
+mod gameboy;
+mod settings;
+mod window;
+
+use std::{
+	path::PathBuf,
+	sync::mpsc::{channel, Receiver, Sender},
+};
+
+use argh::FromArgs;
+use gameboy::Gameboy;
+use settings::DeemgeeConfig;
+use window::WindowEvent;
+
+use crate::window::GameboyEvent;
+
+#[derive(Debug, FromArgs)]
+/// DMG Emulator
+pub struct CliArgs {
+	/// bootrom path
+	#[argh(positional)]
+	pub bootrom: PathBuf,
+	/// game path
+	#[argh(positional)]
+	pub rom: Option<PathBuf>,
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum DmgError {
+	#[error("Bootrom Not Found")]
+	BootromNotFound,
+	#[error("Bootrom Incorrect Size (expected 256 bytes, found {0} bytes)")]
+	BootromInvalidSize(u64),
+	#[error("Bootrom SHA1 failed (expected 4ed31ec6b0b175bb109c0eb5fd3d193da823339f)")]
+	BootromInvalidHash,
+	#[error("Game Not Found")]
+	GameNotFound,
+	#[error("IO Error: {0}")]
+	IO(#[from] std::io::Error),
+}
+
+fn main() -> Result<(), DmgError> {
+	env_logger::init();
+
+	let args: CliArgs = argh::from_env();
+	let config = DeemgeeConfig::from_file();
+
+	let (window_side_tx, gb_side_rx) = channel::<WindowEvent>();
+	let (gb_side_tx, window_side_rx) = channel::<GameboyEvent>();
+
+	let jh = std::thread::spawn(move || run_gameboy(config, args, gb_side_rx, gb_side_tx));
+
+	window::run_window(config, window_side_rx, window_side_tx);
+
+	jh.join().unwrap()
+}
+
+pub fn run_gameboy(
+	_config: DeemgeeConfig,
+	args: CliArgs,
+	rx: Receiver<WindowEvent>,
+	tx: Sender<GameboyEvent>,
+) -> Result<(), DmgError> {
+	if !args.bootrom.is_file() {
+		return Err(DmgError::BootromNotFound);
+	}
+
+	let brom_md = std::fs::metadata(args.bootrom.as_path())?;
+
+	if brom_md.len() != 256 {
+		return Err(DmgError::BootromInvalidSize(brom_md.len()));
+	}
+
+	let bootrom = std::fs::read(args.bootrom)?;
+
+	if bootrom.len() != 256 {
+		return Err(DmgError::BootromInvalidSize(bootrom.len() as u64));
+	}
+
+	if sha1::Sha1::from(bootrom.as_slice()).hexdigest().as_str()
+		!= "4ed31ec6b0b175bb109c0eb5fd3d193da823339f"
+	{
+		return Err(DmgError::BootromInvalidHash);
+	}
+
+	let mut gameboy = Gameboy::new(bootrom.as_slice().try_into().unwrap());
+	let mut last = chrono::Local::now();
+	let mut paused = false;
+	let mut frame_counter = 0;
+
+	'outer: loop {
+		while let Ok(event) = rx.try_recv() {
+			match event {
+				window::WindowEvent::AToggle => gameboy.joypad.a = !gameboy.joypad.a,
+				window::WindowEvent::BToggle => gameboy.joypad.b = !gameboy.joypad.b,
+				window::WindowEvent::SelectToggle => gameboy.joypad.select = !gameboy.joypad.select,
+				window::WindowEvent::StartToggle => gameboy.joypad.start = !gameboy.joypad.start,
+				window::WindowEvent::UpToggle => gameboy.joypad.up = !gameboy.joypad.up,
+				window::WindowEvent::DownToggle => gameboy.joypad.down = !gameboy.joypad.down,
+				window::WindowEvent::LeftToggle => gameboy.joypad.left = !gameboy.joypad.left,
+				window::WindowEvent::RightToggle => gameboy.joypad.right = !gameboy.joypad.right,
+				window::WindowEvent::PauseToggle => paused = !paused,
+				window::WindowEvent::Exit => break 'outer,
+			}
+		}
+
+		if !paused {
+			let redraw_needed = gameboy.tick();
+			if redraw_needed {
+				frame_counter += 1;
+
+				if frame_counter == 60 {
+					let now = chrono::Local::now();
+					log::info!("Rendered 60 frames in {}", now - last);
+					last = now;
+					frame_counter = 0;
+
+					tx.send(GameboyEvent::Framebuffer(gameboy.ppu.write_fb())).unwrap();
+				}
+			}
+		}
+	}
+
+	Ok(())
+}
diff --git a/src/settings.rs b/src/settings.rs
new file mode 100644
index 0000000..00faa43
--- /dev/null
+++ b/src/settings.rs
@@ -0,0 +1,29 @@
+use winit::event::VirtualKeyCode;
+
+#[derive(Debug, serde::Deserialize, Clone, Copy)]
+pub struct DeemgeeConfig {
+	pub bindings: Bindings,
+}
+
+impl DeemgeeConfig {
+	pub fn from_file() -> Self {
+		let mut settings = config::Config::default();
+		settings.merge(config::File::with_name("config")).unwrap();
+		settings.try_into().expect("Config Error")
+	}
+}
+
+#[derive(Debug, serde::Deserialize, Clone, Copy)]
+pub struct Bindings {
+	pub a: VirtualKeyCode,
+	pub b: VirtualKeyCode,
+	pub select: VirtualKeyCode,
+	pub start: VirtualKeyCode,
+	pub up: VirtualKeyCode,
+	pub down: VirtualKeyCode,
+	pub left: VirtualKeyCode,
+	pub right: VirtualKeyCode,
+
+	pub pause: VirtualKeyCode,
+	pub exit: VirtualKeyCode,
+}
diff --git a/src/window.rs b/src/window.rs
new file mode 100644
index 0000000..4b3d8b4
--- /dev/null
+++ b/src/window.rs
@@ -0,0 +1,171 @@
+use std::sync::mpsc::{Receiver, Sender};
+
+use pixels::{Pixels, SurfaceTexture};
+use winit::{
+	event::{Event, VirtualKeyCode},
+	event_loop::{ControlFlow, EventLoop},
+	window::WindowBuilder,
+};
+use winit_input_helper::WinitInputHelper;
+
+use crate::settings::DeemgeeConfig;
+
+macro_rules! define_keypress {
+	($input:ident, $config:ident, $keymap:ident, $tx:ident, $key:ident, $event:ident) => {
+		if $input.key_pressed($config.bindings.$key)
+			&& !*$keymap.idx(&$config, $config.bindings.$key)
+		{
+			$tx.send(WindowEvent::$event).unwrap();
+			*$keymap.idx(&$config, $config.bindings.$key) = true;
+		}
+
+		if $input.key_released($config.bindings.$key)
+			&& *$keymap.idx(&$config, $config.bindings.$key)
+		{
+			$tx.send(WindowEvent::$event).unwrap();
+			*$keymap.idx(&$config, $config.bindings.$key) = false;
+		}
+	};
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum WindowEvent {
+	AToggle,
+	BToggle,
+	SelectToggle,
+	StartToggle,
+	UpToggle,
+	DownToggle,
+	LeftToggle,
+	RightToggle,
+	PauseToggle,
+	Exit,
+}
+
+#[derive(Debug)]
+pub enum GameboyEvent {
+	Framebuffer(Vec<u8>),
+}
+
+pub const FB_HEIGHT: u32 = 144;
+pub const FB_WIDTH: u32 = 160;
+
+#[derive(Debug, Default)]
+pub struct Keymap {
+	pub down: bool,
+	pub up: bool,
+	pub left: bool,
+	pub right: bool,
+	pub start: bool,
+	pub select: bool,
+	pub b: bool,
+	pub a: bool,
+	pub pause: bool,
+}
+
+impl Keymap {
+	pub fn idx(&mut self, config: &DeemgeeConfig, kc: VirtualKeyCode) -> &mut bool {
+		if kc == config.bindings.a {
+			&mut self.a
+		} else if kc == config.bindings.b {
+			&mut self.b
+		} else if kc == config.bindings.start {
+			&mut self.start
+		} else if kc == config.bindings.select {
+			&mut self.select
+		} else if kc == config.bindings.up {
+			&mut self.up
+		} else if kc == config.bindings.down {
+			&mut self.down
+		} else if kc == config.bindings.left {
+			&mut self.left
+		} else if kc == config.bindings.right {
+			&mut self.right
+		} else if kc == config.bindings.pause {
+			&mut self.pause
+		} else {
+			unreachable!();
+		}
+	}
+}
+
+pub fn run_window(config: DeemgeeConfig, rx: Receiver<GameboyEvent>, tx: Sender<WindowEvent>) {
+	let event_loop = EventLoop::new();
+	let mut input = WinitInputHelper::new();
+
+	let window = { WindowBuilder::new().with_title("OwO").build(&event_loop).unwrap() };
+
+	let mut pixels = {
+		let window_size = window.inner_size();
+		let surface_texture = SurfaceTexture::new(window_size.width, window_size.height, &window);
+		Pixels::new(FB_WIDTH, FB_HEIGHT, surface_texture).unwrap()
+	};
+
+	let mut redraw_happened = true;
+	let mut fb: Option<Vec<u8>> = None;
+
+	let mut keymap = Keymap::default();
+
+	event_loop.run(move |event, _, control_flow| {
+		if let Event::RedrawRequested(_) = event {
+			let frame = pixels.get_frame();
+
+			match fb.as_ref() {
+				Some(fb) => {
+					redraw_happened = true;
+					frame.copy_from_slice(fb.as_slice());
+				}
+				None => {
+					let x = vec![0xff; frame.len()];
+					frame.copy_from_slice(x.as_slice())
+				}
+			}
+			if let Err(why) = pixels.render() {
+				log::error!("Pixels Error: {}", why);
+				*control_flow = ControlFlow::Exit;
+				tx.send(WindowEvent::Exit).unwrap();
+				return;
+			}
+		}
+
+		if input.update(&event) {
+			if input.key_pressed(config.bindings.exit) || input.quit() {
+				*control_flow = ControlFlow::Exit;
+				tx.send(WindowEvent::Exit).unwrap();
+				return;
+			}
+
+			if input.key_pressed(config.bindings.pause) {
+				tx.send(WindowEvent::PauseToggle).unwrap();
+			}
+
+			define_keypress!(input, config, keymap, tx, a, AToggle);
+			define_keypress!(input, config, keymap, tx, b, BToggle);
+			define_keypress!(input, config, keymap, tx, start, StartToggle);
+			define_keypress!(input, config, keymap, tx, select, SelectToggle);
+			define_keypress!(input, config, keymap, tx, up, UpToggle);
+			define_keypress!(input, config, keymap, tx, down, DownToggle);
+			define_keypress!(input, config, keymap, tx, left, LeftToggle);
+			define_keypress!(input, config, keymap, tx, right, RightToggle);
+		}
+
+		if let Some(size) = input.window_resized() {
+			pixels.resize_surface(size.width, size.height);
+			window.request_redraw();
+			redraw_happened = false;
+		}
+
+		while let Ok(event) = rx.try_recv() {
+			match event {
+				GameboyEvent::Framebuffer(buf) => {
+					fb = Some(buf);
+
+					if redraw_happened {
+						window.request_redraw();
+						redraw_happened = false;
+					}
+				}
+			}
+		}
+	});
+}