.gitignore

@@ -1,3 +1,2 @@
 /target
 *.log
-/ignore

src/bus.rs

@@ -40,8 +40,7 @@ pub struct Bus {
 
 impl Bus {
     pub fn new() -> Self {
-        let game_rom = match ROM::load_file("ignore/dmg-acid2.gb".to_string()) {
+        let game_rom = match ROM::load_file("roms/cpu_instrs_individual/01-special.gb".to_string()) {
-        // let game_rom = match ROM::load_file("roms/cpu_instrs_individual/01-special.gb".to_string()) {
         // let game_rom = match ROM::load_file("roms/cpu_instrs_individual/03-op sp,hl.gb".to_string()) {
         // let game_rom = match ROM::load_file("roms/cpu_instrs_individual/04-op r,imm.gb".to_string()) {
         // let game_rom = match ROM::load_file("roms/cpu_instrs_individual/05-op rp.gb".to_string()) {
@@ -52,8 +51,7 @@ impl Bus {
         // let game_rom = match ROM::load_file("roms/cpu_instrs_individual/10-bit ops.gb".to_string()) {
         // let game_rom = match ROM::load_file("roms/cpu_instrs_individual/11-op a,(hl).gb".to_string()) {
             Ok(rom) => rom,
-            // _ => ROM::from_bytes(&[0; 0xFFFF])
+            _ => ROM::from_bytes(&[0; 0xFFFF])
-            _ => panic!("Could not read ROM"),
         };
         Self {
             data: [0x00; 0x10000],

src/emulator.rs

@@ -23,6 +23,7 @@ impl Emulator {
         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]);
         }
     }

src/ppu.rs

@@ -2,22 +2,19 @@ use crate::utils::{
     BitIndex,
     get_bit,
     set_bit,
-    to_bit_index,
 };
-use crate::bus::{Bus, AddressRange, BANK_ZERO, VIDEO_RAM};
+use crate::bus::{Bus, BANK_ZERO, VIDEO_RAM};
-use crate::cpu::{Cycles};
 use rand::Rng;
 
-#[derive(Debug, Copy, Clone)]
+struct ColorPalette(u8, u8, u8, u8);
-enum Pixel {
+
-    White,
+struct Tile {
-    Light,
+
-    Dark,
+}
-    Black,
+
+struct Sprite {
 }
 
-#[derive(Debug, Copy, Clone)]
-struct ColorPalette(u8, u8, u8, u8);
 
 pub enum LCDControl {
     DisplayEnable,
@@ -53,8 +50,8 @@ pub const FRAME_BUFFER_LENGTH: u32 = WIDTH * HEIGHT;
 const LCD_CONTROL_ADDRESS: u16 = 0xFF40;
 const LCD_STATUS_ADDRESS: u16 = 0xFF41;
 
-const SCROLL_Y_ADDRESS: u16 = 0xFF42;
+const SCROLL_X_ADDRESS: u16 = 0xFF42;
-const SCROLL_X_ADDRESS: u16 = 0xFF43;
+const SCROLL_Y_ADDRESS: u16 = 0xFF43;
 const LCD_Y_ADDRESS: u16 = 0xFF44;
 const LCD_Y_COMPARE_ADDRESS: u16 = 0xFF45;
 const DMA_ADDRESS: u16 = 0xFF46;
@@ -63,21 +60,49 @@ const OBJECT_PALETTE_0_ADDRESS: u16 = 0xFF48;
 const OBJECT_PALETTE_1_ADDRESS: u16 = 0xFF49;
 const WINDOW_X_ADDRESS: u16 = 0xFF4A;
 const WINDOW_Y_ADDRESS: u16 = 0xFF4B;
-const TILE_MAP_ADDRESS: u16 = 0x9800;
+
+pub struct Window {}
+
+impl Window {
+    pub fn new() -> Self {
+        Self {}
+    }
+
+    fn get_x(bus: &Bus) -> u8 {
+        bus.read(WINDOW_X_ADDRESS)
+    }
+
+    fn set_x(bus: &mut Bus, val: u8) {
+        bus.write(WINDOW_X_ADDRESS, val);
+    }
+
+    fn get_y(bus: &Bus) -> u8 {
+        bus.read(WINDOW_Y_ADDRESS)
+    }
+
+    fn set_y(bus: &mut Bus, val: u8) {
+        bus.write(WINDOW_Y_ADDRESS, val);
+    }
+}
 
 pub struct PPU {
-    cycles: Cycles,
+    window: Window,
+
     rgba_frame: [[u8; 4]; FRAME_BUFFER_LENGTH as usize],
 }
 
 impl PPU {
     pub fn new() -> Self {
         Self {
-            cycles: Cycles(0),
             rgba_frame: [[0, 0, 0xFF, 0]; FRAME_BUFFER_LENGTH as usize],
+            window: Window::new(),
         }
     }
 
+    fn get_sprite(address: u16) {
+
+    }
+
     fn get_scroll_x(bus: &Bus) -> u8 {
         bus.read(SCROLL_X_ADDRESS)
     }
@@ -158,67 +183,46 @@ impl PPU {
         bus.write(LCD_STATUS_ADDRESS, byte);
     }
 
-    fn get_pixel(two_bit_pixel: u8) -> Pixel {
+    fn get_rgba_pixel(two_bit_pixel: u8) -> [u8; 4] {
         match two_bit_pixel {
-            0x00 => Pixel::White,
+            0x00 => [255, 255, 255, 255],
-            0x01 => Pixel::Light,
+            0x01 => [192, 192, 192, 0],
-            0x10 => Pixel::Dark,
+            0x10 => [128, 128, 128, 0],
-            0x11 => Pixel::Black,
+            0x11 => [0, 0, 0, 0],
-            _ => Pixel::Black,
+            _ => [0, 0, 0, 0],
-        }
-    }
-
-    fn get_rgba(pixel: Pixel) -> [u8; 4] {
-        match pixel {
-            Pixel::White => [255, 255, 255, 0],
-            Pixel::Light => [192, 192, 192, 0],
-            Pixel::Dark  => [81, 81, 81, 0],
-            Pixel::Black => [0, 0, 0, 0],
         }
     }
 
     pub fn draw_background(&mut self, bus: &Bus) {
-        let mut idx = 0;
+        let mut pointer = VIDEO_RAM.begin();
-        // let mut tile_line: u16 = 0;
+        let mut pixels_drawn: usize = 0;
-        let mut lcd_y: u8 = 0;
+        while pixels_drawn < FRAME_BUFFER_LENGTH as usize {
-        while lcd_y < 144 {
+            let byte1 = bus.read(pointer);
-            let mut lcd_x: u8 = 0;
+            let byte2 = bus.read(pointer + 1);
-            while lcd_x < 160 {
+            let pixels = PPU::get_byte_pixels(byte1, byte2);
-                let y = lcd_y.wrapping_add(PPU::get_scroll_y(bus));
+            self.rgba_frame[pixels_drawn]     = PPU::get_rgba_pixel(pixels[0]);
-                let x = lcd_x.wrapping_add(PPU::get_scroll_x(bus));
+            self.rgba_frame[pixels_drawn + 1] = PPU::get_rgba_pixel(pixels[1]);
-                let index_x = (x as u16 / 8);
+            self.rgba_frame[pixels_drawn + 2] = PPU::get_rgba_pixel(pixels[2]);
-                let index_y = (y as u16 / 8) * 32;
+            self.rgba_frame[pixels_drawn + 3] = PPU::get_rgba_pixel(pixels[3]);
-                let index = index_x + index_y;
+            self.rgba_frame[pixels_drawn + 4] = PPU::get_rgba_pixel(pixels[4]);
-                let tile_line = (y).rem_euclid(8) * 2;
+            self.rgba_frame[pixels_drawn + 5] = PPU::get_rgba_pixel(pixels[5]);
-                let index_byte = (bus.read(0x9800 + index as u16) as u16) * 16;
+            self.rgba_frame[pixels_drawn + 6] = PPU::get_rgba_pixel(pixels[6]);
-
+            self.rgba_frame[pixels_drawn + 7] = PPU::get_rgba_pixel(pixels[7]);
-                let tile_byte_1 = bus.read(0x8000 + tile_line as u16 + index_byte);
+            pixels_drawn += 8;
-                let tile_byte_2 = bus.read(0x8000 + tile_line as u16 + index_byte + 1);
+            pointer += 2;
-
-                let pixels = PPU::get_byte_pixels(tile_byte_1, tile_byte_2);
-
-                for pixel in pixels {
-                    self.rgba_frame[idx] = PPU::get_rgba(pixel);
-                    idx += 1;
-                }
-
-                lcd_x += 8;
-            }
-            lcd_y += 1;
-            // tile_line += 2;
         }
     }
 
-    fn get_byte_pixels(byte1: u8, byte2: u8) -> [Pixel; 8] {
+    fn get_byte_pixels(byte1: u8, byte2: u8) -> [u8; 8] {
-        let mut pixels: [Pixel; 8] = [Pixel::White; 8];
+        let mut pixels: [u8; 8] = [0; 8];
-        pixels[0] = PPU::get_pixel(((get_bit(byte1, BitIndex::I7) as u8) << 1) | (get_bit(byte2, BitIndex::I7) as u8));
+        pixels[0] = ((get_bit(byte1, BitIndex::I7) as u8) << 1) | (get_bit(byte2, BitIndex::I7) as u8);
-        pixels[1] = PPU::get_pixel(((get_bit(byte1, BitIndex::I6) as u8) << 1) | (get_bit(byte2, BitIndex::I6) as u8));
+        pixels[1] = ((get_bit(byte1, BitIndex::I6) as u8) << 1) | (get_bit(byte2, BitIndex::I6) as u8);
-        pixels[2] = PPU::get_pixel(((get_bit(byte1, BitIndex::I5) as u8) << 1) | (get_bit(byte2, BitIndex::I5) as u8));
+        pixels[2] = ((get_bit(byte1, BitIndex::I5) as u8) << 1) | (get_bit(byte2, BitIndex::I5) as u8);
-        pixels[3] = PPU::get_pixel(((get_bit(byte1, BitIndex::I4) as u8) << 1) | (get_bit(byte2, BitIndex::I4) as u8));
+        pixels[3] = ((get_bit(byte1, BitIndex::I4) as u8) << 1) | (get_bit(byte2, BitIndex::I4) as u8);
-        pixels[4] = PPU::get_pixel(((get_bit(byte1, BitIndex::I3) as u8) << 1) | (get_bit(byte2, BitIndex::I3) as u8));
+        pixels[4] = ((get_bit(byte1, BitIndex::I3) as u8) << 1) | (get_bit(byte2, BitIndex::I3) as u8);
-        pixels[5] = PPU::get_pixel(((get_bit(byte1, BitIndex::I2) as u8) << 1) | (get_bit(byte2, BitIndex::I2) as u8));
+        pixels[5] = ((get_bit(byte1, BitIndex::I2) as u8) << 1) | (get_bit(byte2, BitIndex::I2) as u8);
-        pixels[6] = PPU::get_pixel(((get_bit(byte1, BitIndex::I1) as u8) << 1) | (get_bit(byte2, BitIndex::I1) as u8));
+        pixels[6] = ((get_bit(byte1, BitIndex::I1) as u8) << 1) | (get_bit(byte2, BitIndex::I1) as u8);
-        pixels[7] = PPU::get_pixel(((get_bit(byte1, BitIndex::I0) as u8) << 1) | (get_bit(byte2, BitIndex::I0) as u8));
+        pixels[7] = ((get_bit(byte1, BitIndex::I0) as u8) << 1) | (get_bit(byte2, BitIndex::I0) as u8);
         pixels
     }
 

src/render.rs

@@ -2,8 +2,6 @@ use crate::emulator::Emulator;
 use crate::cpu::{CPU, Cycles};
 use crate::ppu::{WIDTH, HEIGHT};
 
-use std::{thread, time};
-
 use log::error;
 use pixels::{Error, Pixels, SurfaceTexture};
 use winit::dpi::LogicalSize;
@@ -64,12 +62,10 @@ pub fn start_eventloop() {
             },
             Event::MainEventsCleared => {
                 emulator.run(Cycles(70224));
-                emulator.draw(pixels.get_frame());
-
-                thread::sleep(time::Duration::from_millis(14));
                 window.request_redraw();
             },
             Event::RedrawRequested(_) => {
+                emulator.draw(pixels.get_frame());
                 if pixels
                     .render()
                     .map_err(|e| error!("pixels.render() failed: {}", e))

src/utils.rs

@@ -10,20 +10,6 @@ pub enum BitIndex {
     I7,
 }
 
-pub fn to_bit_index(index: u8) -> BitIndex {
-    match index {
-        0 => BitIndex::I0,
-        1 => BitIndex::I1,
-        2 => BitIndex::I2,
-        3 => BitIndex::I3,
-        4 => BitIndex::I4,
-        5 => BitIndex::I5,
-        6 => BitIndex::I6,
-        7 => BitIndex::I7,
-        _ => BitIndex::I7,
-    }
-}
-
 pub fn get_bit_index(index: BitIndex) -> u8 {
     match index {
         BitIndex::I0 => 0,