feat: add pixels-rs and winit as dependencies

Cargo.toml

@@ -7,3 +7,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+anyhow = "1.0.38"
+pixels = "0.2.0"
+winit = "0.24.0"
+winit_input_helper = "0.9.0"

src/bus.rs

@@ -10,7 +10,7 @@ use super::work_ram::{VariableWorkRAM, WorkRAM};
 pub struct Bus {
     boot: Option<[u8; 256]>, // Boot ROM is 256b long
     cartridge: Option<Cartridge>,
-    ppu: PPU,
+    pub ppu: PPU,
     wram: WorkRAM,
     vwram: VariableWorkRAM,
     timer: Timer,

src/cpu.rs

@@ -1,10 +1,11 @@
 use super::bus::Bus;
-use super::instruction::Instruction;
+use super::instruction::{Cycles, Instruction};
+use super::ppu::PPU;
 use std::fmt::{Display, Formatter, Result as FmtResult};
 
 #[derive(Debug, Clone, Default)]
 pub struct Cpu {
-    bus: Bus,
+    pub bus: Bus,
     reg: Registers,
     flags: Flags,
     ime: bool,
@@ -61,32 +62,11 @@ impl Cpu {
     }
 
     pub fn decode(&mut self, opcode: u8) -> Instruction {
-        let tmp = Instruction::from_byte(self, opcode);
-
-        let a = self.register(Register::A);
-        let flag: Flags = self.register(Register::Flag).into();
-        let bc = self.register_pair(RegisterPair::BC);
-        let de = self.register_pair(RegisterPair::DE);
-        let hl = self.register_pair(RegisterPair::HL);
-        let sp = self.register_pair(RegisterPair::SP);
-
-        // println!(
-        //     "A: {:#04X} | BC: {:#06X} | DE: {:#06X} | HL: {:#06X} | SP: {:#06X} | {}",
-        //     a, bc, de, hl, sp, flag
-        // );
-
-        // Get info from serial port
-        // if self.bus.read_byte(0xFF02) == 0x81 {
-        //     let c = self.bus.read_byte(0xFF01) as char;
-        //     self.bus.write_byte(0xFF02, 0x00);
-        //     print!("TEST RESULT!: {}", c);
-        // }
-
-        tmp
+        Instruction::from_byte(self, opcode)
     }
 
-    pub fn execute(&mut self, instruction: Instruction) {
-        Instruction::execute(self, instruction);
+    pub fn execute(&mut self, instruction: Instruction) -> Cycles {
+        Instruction::execute(self, instruction)
     }
 }
 
@@ -119,6 +99,12 @@ impl Cpu {
     }
 }
 
+impl Cpu {
+    pub fn get_ppu(&mut self) -> &mut PPU {
+        &mut self.bus.ppu
+    }
+}
+
 #[derive(Debug, Copy, Clone)]
 enum State {
     Execute,

src/main.rs

@@ -1,20 +1,98 @@
+use anyhow::{anyhow, Result};
 use gb::cpu::Cpu as LR35902;
+use pixels::{Pixels, SurfaceTexture};
+use std::io::Write;
+use winit::{
+    dpi::LogicalSize,
+    event::{Event, VirtualKeyCode},
+    event_loop::{ControlFlow, EventLoop},
+    window::Window,
+    window::WindowBuilder,
+};
+use winit_input_helper::WinitInputHelper;
 
-fn main() {
+// 160 x 144
+const GB_WIDTH: u32 = 160;
+const GB_HEIGHT: u32 = 144;
+
+fn main() -> Result<()> {
+    let event_loop = EventLoop::new();
+    let mut input = WinitInputHelper::new();
+    let window = create_window(&event_loop)?;
+    let mut pixels = create_pixels(&window)?;
+
+    let out = Box::leak(Box::new(std::io::stdout()));
+    let mut out_handle = out.lock();
     let mut game_boy = LR35902::new();
-
     game_boy.load_cartridge("bin/cpu_instrs.gb");
 
-    loop {
-        let pc = game_boy.register_pair(gb::cpu::RegisterPair::PC);
-        let opcode = game_boy.fetch();
-        let instruction = game_boy.decode(opcode);
+    event_loop.run(move |event, _, control_flow| {
+        if let Event::RedrawRequested(_) = event {
+            let ppu = game_boy.get_ppu();
+            let frame = pixels.get_frame();
 
-        println!(
-            "Addr: {:#06X} | Opcode: {:#04X} | Instr: {:X?}",
-            pc, opcode, instruction
-        );
+            ppu.draw(frame);
 
-        game_boy.execute(instruction);
-    }
+            if pixels
+                .render()
+                .map_err(|e| anyhow!("pixels.render() failed: {}", e))
+                .is_err()
+            {
+                *control_flow = ControlFlow::Exit;
+                return;
+            }
+        }
+
+        if input.update(&event) {
+            if input.key_pressed(VirtualKeyCode::Escape) || input.quit() {
+                *control_flow = ControlFlow::Exit;
+                return;
+            }
+
+            if let Some(size) = input.window_resized() {
+                pixels.resize(size.width, size.height);
+            }
+
+            // Emulation
+            let addr = game_boy.register_pair(gb::cpu::RegisterPair::PC);
+
+            let opcode = game_boy.fetch();
+            let instruction = game_boy.decode(opcode);
+            let _cycles = game_boy.execute(instruction);
+            window.request_redraw();
+
+            write!(
+                out_handle,
+                "Addr: {:#06X} | Opcode: {:#04X} | Instr: {:X?}\n",
+                addr, opcode, instruction
+            )
+            .unwrap();
+        }
+    });
+
+    // loop {
+    //     let pc = game_boy.register_pair(gb::cpu::RegisterPair::PC);
+    //     let opcode = game_boy.fetch();
+    //     let instruction = game_boy.decode(opcode);
+
+    //     let _cycles = game_boy.execute(instruction);
+
+    //     let ppu = game_boy.get_ppu();
+    //     ppu.step();
+    // }
+}
+
+pub fn create_window(event_loop: &EventLoop<()>) -> Result<Window> {
+    let size = LogicalSize::new(GB_WIDTH as f64, GB_HEIGHT as f64);
+    Ok(WindowBuilder::new()
+        .with_title("DMG-1 Game Boy")
+        .with_inner_size(size)
+        .with_min_inner_size(size)
+        .build(&event_loop)?)
+}
+
+pub fn create_pixels(window: &Window) -> Result<Pixels<Window>> {
+    let window_size = window.inner_size();
+    let surface_texture = SurfaceTexture::new(window_size.width, window_size.height, window);
+    Ok(Pixels::new(GB_WIDTH, GB_HEIGHT, surface_texture)?)
 }

src/ppu.rs

@@ -7,6 +7,17 @@ pub struct PPU {
     pub stat: LCDStatus,
 }
 
+impl PPU {
+    pub fn step(&mut self) {}
+
+    pub fn draw(&self, frame: &mut [u8]) {
+        for (_i, pixel) in frame.chunks_exact_mut(4).enumerate() {
+            let rgba: [u8; 4] = [0xFF, 0xFF, 0xFF, 0xFF];
+            pixel.copy_from_slice(&rgba);
+        }
+    }
+}
+
 impl Default for PPU {
     fn default() -> Self {
         Self {