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Getters and setters for LCD Status

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This commit is contained in:
Franco Colmenarez 2021-10-22 13:56:57 -05:00
parent bb471a7de7
commit 88d5f08660
1 changed files with 75 additions and 24 deletions
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97
src/ppu.rs
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@ -42,38 +42,71 @@ pub enum LCDStatus {
ModeFlag(LCDStatusModeFlag),
}
pub struct Window {
x: u8,
y: u8,
}
const LCD_CONTROL_ADDRESS: u16 = 0xFF40;
const LCD_STATUS_ADDRESS: u16 = 0xFF41;
const SCROLL_X_ADDRESS: u16 = 0xFF42;
const SCROLL_Y_ADDRESS: u16 = 0xFF43;
const LCD_Y_ADDRESS: u16 = 0xFF44;
const LCD_Y_COMPARE_ADDRESS: u16 = 0xFF45;
const DMA_ADDRESS: u16 = 0xFF46;
const BACKGROUND_PALETTE_ADDRESS: u16 = 0xFF47;
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;
pub struct Window {}
impl Window {
pub fn new() -> Self {
Self {
x: 0,
y: 0,
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 {
scroll_y: u8,
scroll_x: u8,
window: Window,
}
const LCD_CONTROL_ADDRESS: u16 = 0xFF40;
const LCD_STATUS_ADDRESS: u16 = 0xFF41;
impl PPU {
pub fn new() -> Self {
Self {
scroll_x: 0,
scroll_y: 0,
window: Window::new(),
}
}
fn get_scroll_x(bus: &Bus) -> u8 {
bus.read(SCROLL_X_ADDRESS)
}
fn set_scroll_x(bus: &mut Bus, val: u8) {
bus.write(SCROLL_X_ADDRESS, val);
}
fn get_scroll_y(bus: &Bus) -> u8 {
bus.read(SCROLL_Y_ADDRESS)
}
fn set_scroll_y(bus: &mut Bus, val: u8) {
bus.write(SCROLL_Y_ADDRESS, val);
}
fn get_lcd_control(bus: &Bus, control: LCDControl) -> bool {
let byte = bus.read(LCD_CONTROL_ADDRESS);
match control {
@ -90,15 +123,15 @@ impl PPU {
fn set_lcd_control(bus: &mut Bus, control: LCDControl, val: bool) {
let mut byte = bus.read(LCD_CONTROL_ADDRESS);
match control {
LCDControl::DisplayEnable => byte = set_bit(byte, val, BitIndex::I7),
LCDControl::WindowTileMapAddress => byte = set_bit(byte, val, BitIndex::I6),
LCDControl::WindowEnable => byte = set_bit(byte, val, BitIndex::I5),
LCDControl::BackgroundWindowTileAddress => byte = set_bit(byte, val, BitIndex::I4),
LCDControl::BackgroundTileMapAddress => byte = set_bit(byte, val, BitIndex::I3),
LCDControl::ObjectSize => byte = set_bit(byte, val, BitIndex::I2),
LCDControl::ObjectEnable => byte = set_bit(byte, val, BitIndex::I1),
LCDControl::BackgroundPriority => byte = set_bit(byte, val, BitIndex::I0),
byte = match control {
LCDControl::DisplayEnable => set_bit(byte, val, BitIndex::I7),
LCDControl::WindowTileMapAddress => set_bit(byte, val, BitIndex::I6),
LCDControl::WindowEnable => set_bit(byte, val, BitIndex::I5),
LCDControl::BackgroundWindowTileAddress => set_bit(byte, val, BitIndex::I4),
LCDControl::BackgroundTileMapAddress => set_bit(byte, val, BitIndex::I3),
LCDControl::ObjectSize => set_bit(byte, val, BitIndex::I2),
LCDControl::ObjectEnable => set_bit(byte, val, BitIndex::I1),
LCDControl::BackgroundPriority => set_bit(byte, val, BitIndex::I0),
};
bus.write(LCD_CONTROL_ADDRESS, byte);
}
@ -119,4 +152,22 @@ impl PPU {
},
}
}
fn set_lcd_status(bus: &mut Bus, status: LCDStatus, val: bool) {
let mut byte = bus.read(LCD_STATUS_ADDRESS);
byte = match status {
LCDStatus::LYCInterrupt => set_bit(byte, val, BitIndex::I6),
LCDStatus::Mode2OAMInterrupt => set_bit(byte, val, BitIndex::I5),
LCDStatus::Mode1VBlankInterrupt => set_bit(byte, val, BitIndex::I4),
LCDStatus::Mode0HBlankInterrupt => set_bit(byte, val, BitIndex::I3),
LCDStatus::LYCFlag => set_bit(byte, val, BitIndex::I2),
LCDStatus::ModeFlag(mode) => match mode {
LCDStatusModeFlag::HBlank => (byte & 0b11111100) | 0,
LCDStatusModeFlag::VBlank => (byte & 0b11111100) | 1,
LCDStatusModeFlag::SearchingOAM => (byte & 0b11111100) | 2,
LCDStatusModeFlag::TransferringToLCD => (byte & 0b11111100) | 3,
},
};
bus.write(LCD_STATUS_ADDRESS, byte);
}
}