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Refactor ppu and vram (currently crashing)

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This commit is contained in:
Franco Colmenarez 2021-11-15 11:25:30 -05:00
parent de021c2eff
commit 7fa6857ac3
3 changed files with 65 additions and 40 deletions
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23
src/bus.rs
View File

@ -8,6 +8,7 @@ use crate::utils::{
};
use crate::rom::ROM;
use crate::ppu::{
PPU,
LCD_STATUS_ADDRESS,
LCD_CONTROL_ADDRESS,
LCD_Y_ADDRESS,
@ -35,12 +36,13 @@ pub const INTERRUPT_FLAG_ADDRESS: u16 = 0xFF0F;
pub struct Bus {
game_rom: ROM,
data: [u8; 0x10000],
ppu: Rc<RefCell<PPU>>,
joypad: Rc<RefCell<Joypad>>,
timer: Rc<RefCell<Timer>>,
}
impl Bus {
pub fn new(joypad: Rc<RefCell<Joypad>>, timer: Rc<RefCell<Timer>>) -> Self {
pub fn new(ppu: Rc<RefCell<PPU>>, joypad: Rc<RefCell<Joypad>>, timer: Rc<RefCell<Timer>>) -> Self {
let args: Vec<String> = std::env::args().collect();
if args.len() < 2 {
println!("Please, specify a ROM file");
@ -80,6 +82,7 @@ impl Bus {
Self {
data,
game_rom,
ppu,
joypad,
timer,
}
@ -90,6 +93,10 @@ impl Bus {
return self.game_rom.read(address);
} else if address == INTERRUPT_ENABLE_ADDRESS || address == INTERRUPT_FLAG_ADDRESS {
return 0b11100000 | self.data[address as usize];
} else if VIDEO_RAM.contains(&address) {
return self.ppu.borrow().read_vram(address);
} else if SPRITE_ATTRIBUTE_TABLE.contains(&address) {
return self.ppu.borrow().read_oam(address);
} else if address == JOYPAD_ADDRESS {
return self.joypad.borrow().read(self.data[address as usize]);
} else if address == TIMER_DIVIDER_REGISTER_ADDRESS {
@ -140,14 +147,18 @@ impl Bus {
} else if address == JOYPAD_ADDRESS {
let byte = self.data[address as usize];
self.data[address as usize] = (data & 0b11110000) | (byte & 0b00001111);
} else if VIDEO_RAM.contains(&address) {
return self.ppu.borrow_mut().write_vram(address, data);
} else if SPRITE_ATTRIBUTE_TABLE.contains(&address) {
return self.ppu.borrow_mut().write_oam(address, data);
} else if address == DMA_ADDRESS {
// the idea is: when something gets written to $FF46, multiply it by 0x100, then copy 160 bytes starting from that memory location into OAM
self.data[address as usize] = data;
let source = (data as usize) * 0x100;
let mut count = 0;
let oam_addr = SPRITE_ATTRIBUTE_TABLE.min().unwrap() as usize;
let source = (data as u16) * 0x100;
let mut count: u16 = 0;
let oam_addr = SPRITE_ATTRIBUTE_TABLE.min().unwrap();
let mut ppu = self.ppu.borrow_mut();
while count < 160 {
self.data[oam_addr + count] = self.data[source + count];
ppu.write_oam(oam_addr + count, self.data[(source + count) as usize]);
count += 1;
}
} else {

18
src/emulator.rs
View File

@ -11,9 +11,9 @@ use crate::timer::Timer;
use crate::joypad::{Joypad, Button};
pub struct Emulator {
cpu: CPU,
ppu: PPU,
bus: Bus,
cpu: CPU,
ppu: Rc<RefCell<PPU>>,
timer: Rc<RefCell<Timer>>,
joypad: Rc<RefCell<Joypad>>,
}
@ -22,10 +22,11 @@ impl Emulator {
pub fn new() -> Self {
let joypad = Rc::new(RefCell::new(Joypad::new()));
let timer = Rc::new(RefCell::new(Timer::new()));
let ppu = Rc::new(RefCell::new(PPU::new()));
Self {
bus: Bus::new(Rc::clone(&ppu), Rc::clone(&joypad), Rc::clone(&timer)),
cpu: CPU::new(),
ppu: PPU::new(),
bus: Bus::new(Rc::clone(&joypad), Rc::clone(&timer)),
ppu,
timer,
joypad,
}
@ -106,10 +107,13 @@ impl Emulator {
pub fn run(&mut self, cpu_cycles: Cycles, frame_buffer: &mut [u8]) {
self.cpu.reset_cycles();
let mut ppu = self.ppu.borrow_mut();
let mut timer = self.timer.borrow_mut();
while self.cpu.get_cycles().to_t().0 <= cpu_cycles.0 {
self.cpu.run(&mut self.bus);
self.ppu.do_cycles(&mut self.bus, self.cpu.get_last_op_cycles().to_t(), frame_buffer);
self.timer.borrow_mut().do_cycles(&mut self.bus, self.cpu.get_last_op_cycles().to_t());
let cycles = self.cpu.get_last_op_cycles().to_t();
ppu.do_cycles(&mut self.bus, cycles, frame_buffer);
timer.do_cycles(&mut self.bus, cycles);
// 1 CPU cycle = 238.42ns
// thread::sleep(time::Duration::from_nanos((self.cpu.get_last_op_cycles().0 * 238).try_into().unwrap()));
@ -122,7 +126,7 @@ impl Emulator {
let mut frame: [u8; 144 * 160 * 4] = [0; 144 * 160 * 4];
while !exit {
self.cpu.run(&mut self.bus);
self.ppu.do_cycles(&mut self.bus, self.cpu.get_last_op_cycles().to_t(), &mut frame);
self.ppu.borrow_mut().do_cycles(&mut self.bus, self.cpu.get_last_op_cycles().to_t(), &mut frame);
self.timer.borrow_mut().do_cycles(&mut self.bus, self.cpu.get_last_op_cycles().to_t());
// exit = self.cpu.get_exec_calls_count() >= 1258895; // log 1

62
src/ppu.rs
View File

@ -3,7 +3,7 @@ use crate::utils::{
get_bit,
set_bit,
};
use crate::bus::{Bus, SPRITE_ATTRIBUTE_TABLE};
use crate::bus::{Bus, VIDEO_RAM, SPRITE_ATTRIBUTE_TABLE};
use crate::cpu::{Cycles, Interrupt};
pub const LCD_WIDTH: u32 = 160;
@ -142,7 +142,7 @@ impl Sprite {
self.x
}
pub fn get_pixel(&mut self, lcd_x: u8, lcd_y: u8, bus: &Bus, last_bg_index: u8) -> Option<(Pixel, bool)> {
pub fn get_pixel(&mut self, lcd_x: u8, lcd_y: u8, vram: &[u8], last_bg_index: u8) -> Option<(Pixel, bool)> {
if lcd_x < self.x.saturating_sub(8) || lcd_x >= self.x {
return None;
}
@ -184,8 +184,8 @@ impl Sprite {
let tile_line = y.rem_euclid(height) * 2;
let addr = 0x8000 + (tile_number as u16 * 16) + tile_line as u16;
let tile_byte_1 = bus.read(addr);
let tile_byte_2 = bus.read(addr + 1);
let tile_byte_1 = vram[addr as usize - 0x2000];
let tile_byte_2 = vram[addr as usize - 0x2000 + 1];
let bit_pixels_array = PPU::get_byte_pixels(tile_byte_1, tile_byte_2);
self.bit_pixels = Some(bit_pixels_array);
@ -216,6 +216,8 @@ pub struct PPU {
scroll_y: u8,
window_x: u8,
window_y: u8,
vram: [u8; 0x2000],
oam: [u8; 0xA0],
}
impl PPU {
@ -235,9 +237,27 @@ impl PPU {
scroll_y: 0,
window_x: 0,
window_y: 0,
vram: [0; 0x2000],
oam: [0; 0xA0],
}
}
pub fn read_vram(&self, address: u16) -> u8 {
self.vram[(address - VIDEO_RAM.min().unwrap()) as usize]
}
pub fn write_vram(&mut self, address: u16, data: u8) {
self.vram[(address - VIDEO_RAM.min().unwrap()) as usize] = data;
}
pub fn read_oam(&self, address: u16) -> u8 {
self.oam[(address - SPRITE_ATTRIBUTE_TABLE.min().unwrap()) as usize]
}
pub fn write_oam(&mut self, address: u16, data: u8) {
self.oam[(address - SPRITE_ATTRIBUTE_TABLE.min().unwrap()) as usize] = data;
}
pub fn reset_cycles(&mut self) {
self.cycles.0 = 0;
}
@ -294,7 +314,6 @@ impl PPU {
self.window_y_counter = 0;
}
bus.force_write(LCD_Y_ADDRESS, self.lcd_y);
// self.check_lyc(bus);
self.stat_interrupt(bus);
}
}
@ -323,15 +342,6 @@ impl PPU {
}
}
fn check_lyc(&mut self, bus: &mut Bus) {
let lyc_compare = self.lcd_y == bus.read(LCD_Y_COMPARE_ADDRESS);
PPU::set_lcd_status(bus, LCDStatus::LYCFlag, lyc_compare);
if !self.state && lyc_compare && PPU::get_lcd_status(bus, LCDStatus::LYCInterrupt) {
bus.set_interrupt_flag(Interrupt::LCDSTAT, true);
self.state = true;
}
}
fn oam_search(&mut self, bus: &Bus) {
if !self.get_lcd_control(bus, LCDControl::ObjectEnable) {
return;
@ -348,8 +358,8 @@ impl PPU {
// todo!("Make a setting for the 10 sprites per scanline");
break;
}
let y = bus.read(addr);
let x = bus.read(addr + 1);
let y = self.read_oam(addr);
let x = self.read_oam(addr + 1);
if x == 0 {
addr += 4;
@ -369,8 +379,8 @@ impl PPU {
}
let tile_number = bus.read(addr + 2);
let attributes = bus.read(addr + 3);
let tile_number = self.read_oam(addr + 2);
let attributes = self.read_oam(addr + 3);
let palette_zero = !get_bit(attributes, BitIndex::I4);
self.sprite_buffer.push(Sprite {
@ -394,10 +404,10 @@ impl PPU {
self.sprite_buffer.sort_by(|a, b| a.x().cmp(&b.x()));
}
fn find_sprite_pixel(&mut self, lcd_x: u8, bus: &Bus) -> Option<(Pixel, bool)> {
fn find_sprite_pixel(&mut self, lcd_x: u8) -> Option<(Pixel, bool)> {
let lcd_y = self.lcd_y;
for sprite in &mut self.sprite_buffer {
if let Some(pixel) = sprite.get_pixel(lcd_x, lcd_y, bus, self.last_bg_index) {
if let Some(pixel) = sprite.get_pixel(lcd_x, lcd_y, &self.vram, self.last_bg_index) {
return Some(pixel);
}
}
@ -452,12 +462,12 @@ impl PPU {
bus.force_write(LCD_STATUS_ADDRESS, byte);
}
fn get_tile_bytes(x: u8, y: u8, tilemap_area: u16, default_method: bool, bus: &Bus) -> (u8, u8) {
fn get_tile_bytes(&self, x: u8, y: u8, tilemap_area: u16, default_method: bool) -> (u8, u8) {
let index_x = x as u16 / 8;
let index_y = (y as u16 / 8) * 32;
let index = index_x + index_y;
let tile_line = (y).rem_euclid(8) * 2;
let tile_number = bus.read(tilemap_area + index as u16) as u16;
let tile_number = self.read_vram(tilemap_area + index as u16) as u16;
let addr = if default_method {
0x8000 + tile_line as u16 + (tile_number * 16)
} else {
@ -467,7 +477,7 @@ impl PPU {
(base + tile_line + (tile_number * 16)) as u16
};
(bus.read(addr), bus.read(addr + 1))
(self.read_vram(addr), self.read_vram(addr + 1))
}
fn get_window_pixel(&mut self, lcd_x: u8, bus: &Bus) -> Option<Pixel> {
@ -506,7 +516,7 @@ impl PPU {
true => 0x9C00,
false => 0x9800,
};
let (tile_byte_1, tile_byte_2) = PPU::get_tile_bytes(x, y, tilemap_area, default_mode, bus);
let (tile_byte_1, tile_byte_2) = self.get_tile_bytes(x, y, tilemap_area, default_mode);
let bit_pixels_array = PPU::get_byte_pixels(tile_byte_1, tile_byte_2);
self.current_window_pixels = Some(bit_pixels_array);
@ -542,7 +552,7 @@ impl PPU {
true => 0x9C00,
false => 0x9800,
};
let (tile_byte_1, tile_byte_2) = PPU::get_tile_bytes(x, y, tilemap_area, default_mode, bus);
let (tile_byte_1, tile_byte_2) = self.get_tile_bytes(x, y, tilemap_area, default_mode);
let bit_pixels_array = PPU::get_byte_pixels(tile_byte_1, tile_byte_2);
self.current_background_pixels = Some(bit_pixels_array);
@ -581,7 +591,7 @@ impl PPU {
frame_buffer[idx + 2] = rgba[2];
}
if self.get_lcd_control(bus, LCDControl::ObjectEnable) {
if let Some((sprite_pixel, palette_zero)) = self.find_sprite_pixel(lcd_x, bus) {
if let Some((sprite_pixel, palette_zero)) = self.find_sprite_pixel(lcd_x) {
let rgba = PPU::get_rgba(sprite_pixel, match palette_zero {
true => SPRITE_0_COLORS,
false => SPRITE_1_COLORS,