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100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -5,4 +5,14 @@ edition = "2021" # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html +[features] +optimize = ["log/release_max_level_warn"] +default = ["optimize"] + [dependencies] +rand = "0.8" +env_logger = "0.9" +log = "0.4" +pixels = "0.7" +winit = "0.25" +winit_input_helper = "0.10" diff --git a/src/bin/main.rs b/src/bin/main.rs index 95006cd..4ecd8c1 100644 --- a/src/bin/main.rs +++ b/src/bin/main.rs @@ -1,8 +1,6 @@ -use rmg_001::rom::ROM; -use rmg_001::console::Console; +use rmg_001::render::start_eventloop; fn main() -> std::io::Result<()> { - let mut console = Console::new(); - console.cpu_run(); + start_eventloop(); Ok(()) } diff --git a/src/cpu.rs b/src/cpu.rs index d0ce862..0594b8f 100644 --- a/src/cpu.rs +++ b/src/cpu.rs @@ -1,3 +1,4 @@ +use std::env; use crate::utils::{ BitIndex, get_bit, @@ -805,14 +806,17 @@ pub enum Opcode { PrefixCB(Box), IllegalInstruction, } +// Frequency un Hz +const FREQUENCY: f64 = 4194.304; // Store cycles in M #[derive(Debug, Copy, Clone)] -pub struct Cycles(usize); +pub struct Cycles(pub usize); pub struct CPU { registers: Registers, cycles: Cycles, + last_op_cycles: Cycles, exec_calls_count: usize, } @@ -821,6 +825,7 @@ impl CPU { Self { registers: Registers::new(), cycles: Cycles(0), + last_op_cycles: Cycles(0), exec_calls_count: 0, } } @@ -846,6 +851,14 @@ impl CPU { self.cycles } + pub fn set_last_op_cycles(&mut self, cycles_start: Cycles, cycles_end: Cycles) { + self.last_op_cycles = Cycles(cycles_end.0 - cycles_start.0); + } + + pub fn get_last_op_cycles(&self) -> Cycles { + self.last_op_cycles + } + fn log(&self, parameter_bytes: OpcodeParameterBytes) { println!("A: {:02X} F: {:02X} B: {:02X} C: {:02X} D: {:02X} E: {:02X} H: {:02X} L: {:02X} SP: {:04X} PC: 00:{:04X} ({:02X} {:02X} {:02X} {:02X})", self.registers.get(Register::A), @@ -866,12 +879,18 @@ impl CPU { } pub fn run(&mut self, bus: &mut Bus) { + let cycles_start = self.get_cycles(); let program_counter = self.registers.get(Register::PC); let parameter_bytes = OpcodeParameterBytes::from_address(program_counter, bus); let (opcode, cycles) = parameter_bytes.parse_opcode(); - // self.log(parameter_bytes); + if !env::var("CPU_LOG").is_err() { + self.log(parameter_bytes); + } self.increment_cycles(cycles); self.exec(opcode, bus); + let cycles_end = self.get_cycles(); + + self.set_last_op_cycles(cycles_start, cycles_end); // self.increment_exec_calls_count(); } diff --git a/src/console.rs b/src/emulator.rs similarity index 66% rename from src/console.rs rename to src/emulator.rs index 70c1d6e..53e8692 100644 --- a/src/console.rs +++ b/src/emulator.rs @@ -1,16 +1,16 @@ use std::{thread, time}; -use crate::cpu::CPU; +use crate::cpu::{CPU, Cycles}; use crate::ppu::PPU; use crate::bus::Bus; -pub struct Console { +pub struct Emulator { cpu: CPU, ppu: PPU, bus: Bus, } -impl Console { +impl Emulator { pub fn new() -> Self { Self { cpu: CPU::new(), @@ -19,7 +19,23 @@ impl Console { } } - pub fn cpu_run(&mut self) { + pub fn draw(&mut self, frame: &mut [u8]) { + self.ppu.draw_background(&self.bus); + let ppu_frame = self.ppu.get_rgba_frame(&self.bus); + for (i, pixel) in frame.chunks_exact_mut(4).enumerate() { + let rgba = [0x5e, 0x48, 0xe8, 0xff]; + pixel.copy_from_slice(&ppu_frame[i]); + } + } + + pub fn run(&mut self, cpu_cycles: Cycles) { + self.cpu.reset_cycles(); + while self.cpu.get_cycles().0 <= cpu_cycles.0 { + self.cpu.run(&mut self.bus); + } + } + + pub fn cpu_loop(&mut self) { let mut exit = false; while !exit { self.cpu.run(&mut self.bus); diff --git a/src/lib.rs b/src/lib.rs index 926e80e..4f76f07 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -3,4 +3,5 @@ pub mod cpu; pub mod ppu; pub mod rom; pub mod bus; -pub mod console; +pub mod emulator; +pub mod render; diff --git a/src/ppu.rs b/src/ppu.rs index 4bb3ec2..6738b09 100644 --- a/src/ppu.rs +++ b/src/ppu.rs @@ -3,7 +3,8 @@ use crate::utils::{ get_bit, set_bit, }; -use crate::bus::{Bus, BANK_ZERO}; +use crate::bus::{Bus, BANK_ZERO, VIDEO_RAM}; +use rand::Rng; struct ColorPalette(u8, u8, u8, u8); @@ -42,6 +43,10 @@ pub enum LCDStatus { ModeFlag(LCDStatusModeFlag), } +pub const WIDTH: u32 = 160; +pub const HEIGHT: u32 = 144; +pub const FRAME_BUFFER_LENGTH: u32 = WIDTH * HEIGHT; + const LCD_CONTROL_ADDRESS: u16 = 0xFF40; const LCD_STATUS_ADDRESS: u16 = 0xFF41; @@ -82,11 +87,14 @@ impl Window { pub struct PPU { window: Window, + + rgba_frame: [[u8; 4]; FRAME_BUFFER_LENGTH as usize], } impl PPU { pub fn new() -> Self { Self { + rgba_frame: [[0, 0, 0xFF, 0]; FRAME_BUFFER_LENGTH as usize], window: Window::new(), } } @@ -174,4 +182,51 @@ impl PPU { }; bus.write(LCD_STATUS_ADDRESS, byte); } + + fn get_rgba_pixel(two_bit_pixel: u8) -> [u8; 4] { + match two_bit_pixel { + 0x00 => [255, 255, 255, 255], + 0x01 => [192, 192, 192, 0], + 0x10 => [128, 128, 128, 0], + 0x11 => [0, 0, 0, 0], + _ => [0, 0, 0, 0], + } + } + + pub fn draw_background(&mut self, bus: &Bus) { + let mut pointer = VIDEO_RAM.begin(); + let mut pixels_drawn: usize = 0; + while pixels_drawn < FRAME_BUFFER_LENGTH as usize { + let byte1 = bus.read(pointer); + let byte2 = bus.read(pointer + 1); + let pixels = PPU::get_byte_pixels(byte1, byte2); + self.rgba_frame[pixels_drawn] = PPU::get_rgba_pixel(pixels[0]); + self.rgba_frame[pixels_drawn + 1] = PPU::get_rgba_pixel(pixels[1]); + self.rgba_frame[pixels_drawn + 2] = PPU::get_rgba_pixel(pixels[2]); + self.rgba_frame[pixels_drawn + 3] = PPU::get_rgba_pixel(pixels[3]); + self.rgba_frame[pixels_drawn + 4] = PPU::get_rgba_pixel(pixels[4]); + self.rgba_frame[pixels_drawn + 5] = PPU::get_rgba_pixel(pixels[5]); + self.rgba_frame[pixels_drawn + 6] = PPU::get_rgba_pixel(pixels[6]); + self.rgba_frame[pixels_drawn + 7] = PPU::get_rgba_pixel(pixels[7]); + pixels_drawn += 8; + pointer += 2; + } + } + + fn get_byte_pixels(byte1: u8, byte2: u8) -> [u8; 8] { + let mut pixels: [u8; 8] = [0; 8]; + pixels[0] = ((get_bit(byte1, BitIndex::I7) as u8) << 1) | (get_bit(byte2, BitIndex::I7) as u8); + pixels[1] = ((get_bit(byte1, BitIndex::I6) as u8) << 1) | (get_bit(byte2, BitIndex::I6) as u8); + pixels[2] = ((get_bit(byte1, BitIndex::I5) as u8) << 1) | (get_bit(byte2, BitIndex::I5) as u8); + pixels[3] = ((get_bit(byte1, BitIndex::I4) as u8) << 1) | (get_bit(byte2, BitIndex::I4) as u8); + pixels[4] = ((get_bit(byte1, BitIndex::I3) as u8) << 1) | (get_bit(byte2, BitIndex::I3) as u8); + pixels[5] = ((get_bit(byte1, BitIndex::I2) as u8) << 1) | (get_bit(byte2, BitIndex::I2) as u8); + pixels[6] = ((get_bit(byte1, BitIndex::I1) as u8) << 1) | (get_bit(byte2, BitIndex::I1) as u8); + pixels[7] = ((get_bit(byte1, BitIndex::I0) as u8) << 1) | (get_bit(byte2, BitIndex::I0) as u8); + pixels + } + + pub fn get_rgba_frame(&self, bus: &Bus) -> &[[u8; 4]; FRAME_BUFFER_LENGTH as usize] { + &self.rgba_frame + } } diff --git a/src/render.rs b/src/render.rs new file mode 100644 index 0000000..e99efb4 --- /dev/null +++ b/src/render.rs @@ -0,0 +1,81 @@ +use crate::emulator::Emulator; +use crate::cpu::{CPU, Cycles}; +use crate::ppu::{WIDTH, HEIGHT}; + +use log::error; +use pixels::{Error, Pixels, SurfaceTexture}; +use winit::dpi::LogicalSize; +use winit::event::{Event, VirtualKeyCode, WindowEvent}; +use winit::event_loop::{ControlFlow, EventLoop}; +use winit::window::{Window, WindowBuilder}; +use winit_input_helper::WinitInputHelper; + +pub fn create_pixels(width: u32, height: u32, window: &Window) -> Pixels { + let window_size = window.inner_size(); + let surface_texture = SurfaceTexture::new(window_size.width, window_size.height, window); + Pixels::new(width, height, surface_texture).unwrap() +} + +pub fn create_window(width: u32, height: u32, title: String, event_loop: &EventLoop) -> Window { + let size = LogicalSize::new(width as f64, height as f64); + WindowBuilder::new() + .with_title(title) + .with_inner_size(size) + .with_min_inner_size(size) + .build(event_loop) + .unwrap() +} + +pub fn start_eventloop() { + env_logger::init(); + let event_loop = EventLoop::new(); + let mut input = WinitInputHelper::new(); + + let window = create_window(WIDTH, HEIGHT, "rmg-001".to_string(), &event_loop); + let mut pixels = create_pixels(WIDTH, HEIGHT, &window); + + let mut emulator = Emulator::new(); + + let mut count: usize = 0; + event_loop.run(move |event, _, control_flow| { + // Handle input events + if input.update(&event) { + // Close events + if input.key_pressed(VirtualKeyCode::Escape) || input.quit() { + *control_flow = ControlFlow::Exit; + return; + } + + // Resize the window + if let Some(size) = input.window_resized() { + pixels.resize_surface(size.width, size.height); + } + } + + match event { + Event::WindowEvent { + event: WindowEvent::CloseRequested, + .. + } => { + println!("The close button was pressed; stopping"); + *control_flow = ControlFlow::Exit + }, + Event::MainEventsCleared => { + emulator.run(Cycles(70224)); + window.request_redraw(); + }, + Event::RedrawRequested(_) => { + emulator.draw(pixels.get_frame()); + if pixels + .render() + .map_err(|e| error!("pixels.render() failed: {}", e)) + .is_err() + { + *control_flow = ControlFlow::Exit; + return; + } + }, + _ => () + } + }); +}