952 lines
27 KiB
Rust
952 lines
27 KiB
Rust
use iced::{
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Point, Size,
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advanced::graphics::geometry::Renderer,
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widget::canvas::{Fill, Frame},
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};
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use crate::{
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hex_view::Memory,
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mem::{MemoryMap, Segment},
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};
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#[derive(Clone, Copy, PartialEq, Eq, Hash)]
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pub struct Color {
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pub r: u8,
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pub g: u8,
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pub b: u8,
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}
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impl Into<Fill> for Color {
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fn into(self) -> Fill {
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iced::Color::from_rgb8(self.r, self.g, self.b).into()
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}
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}
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pub struct RenderBuffer<const W: usize, const H: usize> {
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buffer: Box<[Color]>,
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}
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impl<const W: usize, const H: usize> RenderBuffer<W, H> {
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pub fn empty() -> Self {
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Self {
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buffer: vec![Color { r: 0, g: 0, b: 0 }; W * H].into_boxed_slice(),
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}
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}
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pub fn write(&mut self, line: usize, pixel: usize, color: Color) {
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assert!(line < H && pixel < W);
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self.buffer[line * W + pixel] = color;
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}
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pub fn read(&self, line: usize, pixel: usize) -> Color {
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assert!(line < H && pixel < W);
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self.buffer[line * W + pixel]
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}
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pub fn clone_from(&mut self, other: &Self) {
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self.buffer.copy_from_slice(&other.buffer);
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}
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}
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pub(crate) enum PPUMMRegisters {
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Palette,
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}
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pub struct OAM {
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mem: Vec<u8>,
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addr: u8,
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}
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enum BackgroundState {
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NameTableBytePre,
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NameTableByte,
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AttrTableBytePre,
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AttrTableByte,
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PatternTableTileLowPre,
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PatternTableTileLow,
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PatternTableTileHighPre,
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PatternTableTileHigh,
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}
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pub struct Background {
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/// Current vram address, 15 bits
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v: u16,
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/// Temp vram address, 15 bits
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t: u16,
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/// Fine X control, 3 bits
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x: u8,
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/// Whether this is the first or second write to PPUSCROLL
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/// When false, writes to x
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w: bool,
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/// When true, v is incremented by 32 after each read
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vram_column: bool,
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state: BackgroundState,
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cur_nametable: u8,
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cur_attr: u8,
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cur_high: u8,
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cur_low: u8,
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cur_shift_high: u8,
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cur_shift_low: u8,
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}
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pub struct Mask {
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grayscale: bool,
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background_on_left_edge: bool,
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sprites_on_left_edge: bool,
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enable_background: bool,
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enable_sprites: bool,
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em_red: bool,
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em_green: bool,
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em_blue: bool,
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}
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const COLORS: &'static [Color; 0b100_0000] = &[
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Color {
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r: 0x66,
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g: 0x66,
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b: 0x66,
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}, // 00
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Color {
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r: 0x00,
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g: 0x2A,
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b: 0x88,
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}, // 01
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Color {
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r: 0x14,
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g: 0x12,
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b: 0xA7,
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}, // 02
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Color {
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r: 0x3B,
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g: 0x00,
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b: 0xA4,
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}, // 03
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Color {
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r: 0x5C,
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g: 0x00,
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b: 0x7E,
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}, // 04
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Color {
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r: 0x6E,
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g: 0x00,
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b: 0x40,
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}, // 05
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Color {
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r: 0x6C,
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g: 0x06,
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b: 0x00,
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}, // 06
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Color {
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r: 0x56,
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g: 0x1D,
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b: 0x00,
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}, // 07
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Color {
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r: 0x33,
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g: 0x35,
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b: 0x00,
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}, // 08
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Color {
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r: 0x0B,
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g: 0x48,
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b: 0x00,
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}, // 09
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Color {
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r: 0x00,
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g: 0x52,
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b: 0x00,
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}, // 0A
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Color {
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r: 0x00,
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g: 0x4F,
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b: 0x08,
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}, // 0B
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Color {
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r: 0x00,
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g: 0x40,
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b: 0x4D,
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}, // 0C
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Color {
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r: 0x00,
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g: 0x00,
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b: 0x00,
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}, // 0D
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Color {
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r: 0x00,
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g: 0x00,
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b: 0x00,
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}, // 0E
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Color {
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r: 0x00,
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g: 0x00,
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b: 0x00,
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}, // 0F
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Color {
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r: 0xAD,
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g: 0xAD,
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b: 0xAD,
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}, // 10
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Color {
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r: 0x15,
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g: 0x5F,
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b: 0xD9,
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}, // 11
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Color {
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r: 0x42,
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g: 0x40,
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b: 0xFF,
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}, // 12
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Color {
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r: 0x75,
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g: 0x27,
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b: 0xFE,
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}, // 13
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Color {
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r: 0xA0,
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g: 0x1A,
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b: 0xCC,
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}, // 14
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Color {
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r: 0xB7,
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g: 0x1E,
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b: 0x7B,
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}, // 15
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Color {
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r: 0xB5,
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g: 0x31,
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b: 0x20,
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}, // 16
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Color {
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r: 0x99,
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g: 0x4E,
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b: 0x00,
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}, // 17
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Color {
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r: 0x6B,
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g: 0x6D,
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b: 0x00,
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}, // 18
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Color {
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r: 0x38,
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g: 0x87,
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b: 0x00,
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}, // 19
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Color {
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r: 0x0C,
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g: 0x93,
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b: 0x00,
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}, // 1A
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Color {
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r: 0x00,
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g: 0x8F,
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b: 0x32,
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}, // 1B
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Color {
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r: 0x00,
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g: 0x7C,
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b: 0x8D,
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}, // 1C
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Color {
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r: 0x00,
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g: 0x00,
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b: 0x00,
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}, // 1D
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Color {
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r: 0x00,
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g: 0x00,
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b: 0x00,
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}, // 1E
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Color {
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r: 0x00,
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g: 0x00,
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b: 0x00,
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}, // 1F
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Color {
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r: 0xFF,
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g: 0xFE,
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b: 0xFF,
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}, // 20
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Color {
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r: 0x64,
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g: 0xB0,
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b: 0xFF,
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}, // 21
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Color {
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r: 0x92,
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g: 0x90,
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b: 0xFF,
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}, // 22
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Color {
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r: 0xC6,
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g: 0x76,
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b: 0xFF,
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}, // 23
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Color {
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r: 0xF3,
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g: 0x6A,
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b: 0xFF,
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}, // 24
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Color {
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r: 0xFE,
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g: 0x6E,
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b: 0xCC,
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}, // 25
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Color {
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r: 0xFE,
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g: 0x81,
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b: 0x70,
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}, // 26
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Color {
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r: 0xEA,
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g: 0x9E,
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b: 0x22,
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}, // 27
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Color {
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r: 0xBC,
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g: 0xBE,
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b: 0x00,
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}, // 28
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Color {
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r: 0x88,
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g: 0xD8,
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b: 0x00,
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}, // 29
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Color {
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r: 0x5C,
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g: 0xE4,
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b: 0x30,
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}, // 2A
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Color {
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r: 0x45,
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g: 0xE0,
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b: 0x82,
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}, // 2B
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Color {
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r: 0x48,
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g: 0xCD,
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b: 0xDE,
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}, // 2C
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Color {
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r: 0x4F,
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g: 0x4F,
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b: 0x4F,
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}, // 2D
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Color {
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r: 0x00,
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g: 0x00,
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b: 0x00,
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}, // 2E
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Color {
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r: 0x00,
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g: 0x00,
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b: 0x00,
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}, // 2F
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Color {
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r: 0xFF,
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g: 0xFE,
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b: 0xFF,
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}, // 30
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Color {
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r: 0xC0,
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g: 0xDF,
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b: 0xFF,
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}, // 31
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Color {
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r: 0xD3,
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g: 0xD2,
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b: 0xFF,
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}, // 32
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Color {
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r: 0xE8,
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g: 0xC8,
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b: 0xFF,
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}, // 33
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Color {
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r: 0xFB,
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g: 0xC2,
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b: 0xFF,
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}, // 34
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Color {
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r: 0xFE,
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g: 0xC4,
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b: 0xEA,
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}, // 35
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Color {
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r: 0xFE,
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g: 0xCC,
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b: 0xC5,
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}, // 36
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Color {
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r: 0xF7,
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g: 0xD8,
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b: 0xA5,
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}, // 37
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Color {
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r: 0xE4,
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g: 0xE5,
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b: 0x94,
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}, // 38
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Color {
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r: 0xCF,
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g: 0xEF,
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b: 0x96,
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}, // 39
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Color {
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r: 0xBD,
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g: 0xF4,
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b: 0xAB,
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}, // 3A
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Color {
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r: 0xB3,
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g: 0xF3,
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b: 0xCC,
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}, // 3B
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Color {
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r: 0xB5,
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g: 0xEB,
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b: 0xF2,
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}, // 3C
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Color {
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r: 0xB8,
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g: 0xB8,
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b: 0xB8,
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}, // 3D
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Color {
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r: 0x00,
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g: 0x00,
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b: 0x00,
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}, // 3E
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Color {
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r: 0x00,
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g: 0x00,
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b: 0x00,
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}, // 3F
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];
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pub struct Palette {
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colors: &'static [Color; 0x40],
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ram: [u8; 0x20],
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}
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impl Palette {
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pub fn color(&self, idx: u8) -> Color {
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debug_assert!(idx < 0x20, "Palette index out of range");
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self.colors[(self.ram[idx as usize] & 0x3F) as usize]
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}
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}
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pub struct PPU {
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// registers: PPURegisters,
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frame_count: usize,
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nmi_enabled: bool,
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nmi_waiting: bool,
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pub even: bool,
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pub scanline: usize,
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pub pixel: usize,
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pub mask: Mask,
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pub vblank: bool,
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pub(crate) memory: MemoryMap<PPUMMRegisters>,
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palette: Palette,
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background: Background,
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oam: OAM,
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pub render_buffer: RenderBuffer<256, 240>,
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pub dbg_int: bool,
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pub cycle: usize,
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}
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bitfield::bitfield! {
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pub struct PPUStatus(u8);
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impl Debug;
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vblank, set_vblank: 7;
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sprite0, set_sprite0: 6;
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sprite_overflow, set_sprite_overflow: 5;
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}
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impl std::fmt::Debug for PPU {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(
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f,
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"PPU: f {}, s {}, p {}",
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self.frame_count, self.scanline, self.pixel
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)
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}
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}
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impl PPU {
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pub fn with_chr_rom(rom: &[u8]) -> Self {
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Self {
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cycle: 25,
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dbg_int: false,
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mask: Mask {
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grayscale: false,
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background_on_left_edge: false,
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sprites_on_left_edge: false,
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enable_background: false,
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enable_sprites: false,
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em_red: false,
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em_green: false,
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em_blue: false,
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},
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palette: Palette {
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colors: COLORS,
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ram: [
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0x09, 0x01, 0x00, 0x01, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C,
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0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
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0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
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],
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},
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vblank: false,
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frame_count: 0,
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nmi_enabled: false,
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nmi_waiting: false,
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even: false,
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scanline: 0,
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pixel: 25,
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render_buffer: RenderBuffer::empty(),
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memory: MemoryMap::new(vec![
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Segment::rom("CHR ROM", 0x0000, rom),
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Segment::ram("Internal VRAM", 0x2000, 0x1000),
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Segment::mirror("Mirror of VRAM", 0x3000, 0x0F00, 1),
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Segment::reg("Palette Control", 0x3F00, 0x0020, PPUMMRegisters::Palette),
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Segment::mirror("Mirror of Palette", 0x3F20, 0x00E0, 3),
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]),
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background: Background {
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v: 0,
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t: 0,
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x: 0,
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w: false,
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vram_column: false,
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state: BackgroundState::NameTableBytePre,
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cur_high: 0,
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cur_low: 0,
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cur_shift_high: 0,
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cur_shift_low: 0,
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cur_nametable: 0,
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cur_attr: 0,
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},
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oam: OAM {
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mem: vec![0u8; 256],
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addr: 0,
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},
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}
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}
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pub fn reset(&mut self) {
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*self = Self {
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memory: std::mem::replace(&mut self.memory, MemoryMap::new(vec![])),
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..Self::with_chr_rom(&[])
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};
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}
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pub fn rendering_enabled(&self) -> bool {
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self.mask.enable_background || self.mask.enable_sprites
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}
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pub fn read_reg(&mut self, offset: u16) -> u8 {
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match offset {
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0 => panic!("ppuctrl is write-only"),
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1 => panic!("ppumask is write-only"),
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2 => {
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let tmp = if self.vblank { 0b1000_0000 } else { 0 };
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self.vblank = false;
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self.background.w = false;
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tmp
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}
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3 => panic!("oamaddr is write-only"),
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4 => self.oam.mem[self.oam.addr as usize],
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5 => panic!("ppuscroll is write-only"),
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6 => panic!("ppuaddr is write-only"),
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7 => {
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let val = self
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.memory
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.read(self.background.v)
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.reg_map(|a, off| match a {
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PPUMMRegisters::Palette => self.palette.ram[off as usize],
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});
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// if self.background
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self.background.v = self
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.background
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.v
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.wrapping_add(if self.background.vram_column { 32 } else { 1 });
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val
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}
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// 7 => self.registers.data,
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_ => panic!("No register at {:02X}", offset),
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}
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}
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pub fn write_reg(&mut self, offset: u16, val: u8) {
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match offset {
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0x00 => {
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self.nmi_enabled = val & 0b1000_0000 != 0;
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self.background.t =
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(self.background.t & 0b0001_1000_0000_0000) | (((val & 0b11) as u16) << 10);
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self.background.vram_column = val & 0b0000_0010 != 0;
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// TODO: other control fields
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}
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0x01 => {
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// self.dbg_int = true;
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self.mask.grayscale = val & 0b0000_0001 != 0;
|
|
self.mask.background_on_left_edge = val & 0b0000_0010 != 0;
|
|
self.mask.sprites_on_left_edge = val & 0b0000_0100 != 0;
|
|
self.mask.enable_background = val & 0b0000_1000 != 0;
|
|
self.mask.enable_sprites = val & 0b0001_0000 != 0;
|
|
self.mask.em_red = val & 0b0010_0000 != 0;
|
|
self.mask.em_green = val & 0b0100_0000 != 0;
|
|
self.mask.em_blue = val & 0b1000_0000 != 0;
|
|
// todo!("Mask: {:02X}", val)
|
|
}
|
|
0x02 => {
|
|
todo!("Unable to write to PPU status")
|
|
// TODO: ppu status
|
|
}
|
|
0x03 => self.oam.addr = val,
|
|
0x04 => {
|
|
self.oam.mem[self.oam.addr as usize] = val;
|
|
self.oam.addr = self.oam.addr.wrapping_add(1);
|
|
}
|
|
0x05 => {
|
|
if self.background.w {
|
|
// Is y scroll
|
|
self.background.t = (self.background.t & 0b0000_1100_0001_1111)
|
|
| (((val as u16) << 2) & 0b0000_0011_1110_0000)
|
|
| (((val as u16) << 12) & 0b0111_0000_0000_0000);
|
|
self.background.w = false;
|
|
} else {
|
|
// Is x scroll
|
|
self.background.x = val & 0b111; // Lowest three bits
|
|
self.background.t =
|
|
(self.background.t & 0b0111_1111_1110_0000) | (val as u16 >> 3);
|
|
self.background.w = true;
|
|
}
|
|
}
|
|
0x06 => {
|
|
// TODO: ppu addr
|
|
if self.background.w {
|
|
self.background.v =
|
|
u16::from_le_bytes([val, self.background.v.to_le_bytes()[1]]);
|
|
self.background.w = true;
|
|
} else {
|
|
self.background.v =
|
|
u16::from_le_bytes([self.background.v.to_le_bytes()[0], val & 0b0011_1111]);
|
|
self.background.w = true;
|
|
}
|
|
// todo!("PPUADDR write")
|
|
}
|
|
0x07 => {
|
|
// TODO: ppu data
|
|
}
|
|
_ => panic!("No register at {:02X}", offset),
|
|
}
|
|
// TODO: use data in PPU
|
|
}
|
|
// pub fn write_oamdma(&mut self, val: u8) {
|
|
// // TODO: OAM high addr
|
|
// }
|
|
|
|
pub fn run_one_clock_cycle(&mut self) -> bool {
|
|
self.cycle += 1;
|
|
self.pixel += 1;
|
|
if self.scanline == 261
|
|
&& (self.pixel == 341 || (self.pixel == 340 && self.even && self.rendering_enabled()))
|
|
{
|
|
self.scanline = 0;
|
|
self.pixel = 0;
|
|
self.even = !self.even;
|
|
}
|
|
if self.pixel == 341 {
|
|
self.pixel = 0;
|
|
self.scanline += 1;
|
|
}
|
|
if self.mask.enable_background || self.mask.enable_sprites {
|
|
if self.pixel == 257 {
|
|
self.background.v = (self.background.v & 0b0111_1011_1110_0000)
|
|
| (self.background.t & 0b0000_0100_0001_1111);
|
|
}
|
|
if self.pixel == 280 && self.scanline == 260 {
|
|
self.background.v = (self.background.v & 0b0000_0100_0001_1111)
|
|
| (self.background.t & 0b0111_1011_1110_0000);
|
|
}
|
|
if self.scanline < 240 || self.scanline == 261 {
|
|
// TODO
|
|
if self.pixel == 0 {
|
|
// self.dbg_int = true;
|
|
// idle cycle
|
|
} else if self.pixel < 257 {
|
|
// self.dbg_int = true;
|
|
if self.scanline < 240 {
|
|
// Determine background color
|
|
let a = self.background.cur_shift_high & 0x80;
|
|
let b = self.background.cur_shift_low & 0x80;
|
|
let val = (a >> 6) | (b >> 7);
|
|
debug_assert!(val < 4);
|
|
|
|
// Write to screen
|
|
self.render_buffer.write(
|
|
self.scanline,
|
|
self.pixel - 1,
|
|
self.palette.color(val)
|
|
// self.palette.colors[val as usize],
|
|
); // TODO: this should come from shift registers
|
|
self.background.cur_shift_high <<= 1;
|
|
self.background.cur_shift_low <<= 1;
|
|
}
|
|
self.background.state = match self.background.state {
|
|
BackgroundState::NameTableByte => {
|
|
// TODO: Fetch name table byte
|
|
let addr = 0x2000 + self.pixel / 8 + self.scanline / 8;
|
|
let val = self.memory.read(addr as u16).reg_map(|_, _| todo!());
|
|
self.background.cur_nametable = val;
|
|
// self.background.v;
|
|
BackgroundState::AttrTableBytePre
|
|
}
|
|
BackgroundState::AttrTableByte => {
|
|
// TODO: Fetch attr table byte
|
|
// let addr = 0x2000 + self.pixel / 8 + self.scanline / 8;
|
|
// let val = self.memory.read(addr as u16).reg_map(|_, _| todo!());
|
|
// self.background.cur_attr = val;
|
|
BackgroundState::PatternTableTileLowPre
|
|
}
|
|
BackgroundState::PatternTableTileLow => {
|
|
// TODO: Fetch
|
|
let addr = self.background.cur_nametable as u16 * 16
|
|
+ (self.scanline % 8) as u16;
|
|
let val = self.memory.read(addr).reg_map(|_, _| todo!());
|
|
self.background.cur_low = val;
|
|
BackgroundState::PatternTableTileHighPre
|
|
}
|
|
BackgroundState::PatternTableTileHigh => {
|
|
// TODO: Fetch
|
|
let addr = self.background.cur_nametable as u16 * 16
|
|
+ 8
|
|
+ (self.scanline % 8) as u16;
|
|
let val = self.memory.read(addr).reg_map(|_, _| todo!());
|
|
self.background.cur_high = val;
|
|
self.background.cur_shift_low = self.background.cur_low;
|
|
self.background.cur_shift_high = self.background.cur_high;
|
|
BackgroundState::NameTableBytePre
|
|
}
|
|
BackgroundState::NameTableBytePre => BackgroundState::NameTableByte,
|
|
BackgroundState::AttrTableBytePre => BackgroundState::AttrTableByte,
|
|
BackgroundState::PatternTableTileLowPre => {
|
|
BackgroundState::PatternTableTileLow
|
|
}
|
|
BackgroundState::PatternTableTileHighPre => {
|
|
BackgroundState::PatternTableTileHigh
|
|
}
|
|
};
|
|
} else {
|
|
// TODO: Sprite fetches
|
|
}
|
|
}
|
|
}
|
|
if self.scanline == 241 && self.pixel == 1 {
|
|
self.vblank = true;
|
|
self.nmi_waiting = self.nmi_enabled;
|
|
self.frame_count += 1;
|
|
self.background.state = BackgroundState::NameTableBytePre;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
pub fn peek_nmi(&self) -> bool {
|
|
self.nmi_waiting
|
|
}
|
|
pub fn nmi_waiting(&mut self) -> bool {
|
|
if self.nmi_waiting {
|
|
self.nmi_waiting = false;
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
pub fn peek_irq(&self) -> bool {
|
|
self.nmi_waiting
|
|
}
|
|
pub fn irq_waiting(&mut self) -> bool {
|
|
false
|
|
}
|
|
|
|
pub fn render_name_table<R: Renderer>(&self, frame: &mut Frame<R>) {
|
|
for y in 0..280 / 8 {
|
|
for x in 0..512 / 8 {
|
|
let name = self.memory.peek(x + y * 512 / 8 + 0x2000).unwrap() as u16 * 16;
|
|
for y_off in 0..8 {
|
|
let low = self.memory.peek(name + y_off).unwrap();
|
|
let high = self.memory.peek(name + y_off + 8).unwrap();
|
|
for bit in (0..8).rev() {
|
|
frame.fill_rectangle(
|
|
Point::new(x as f32 * 8. + bit as f32, y as f32 * 8. + y_off as f32),
|
|
Size::new(1., 1.),
|
|
match (low & (1 << bit) != 0, high & (1 << bit) != 0) {
|
|
(false, false) => Color { r: 0, g: 0, b: 0 },
|
|
(true, false) => Color {
|
|
r: 64,
|
|
g: 64,
|
|
b: 64,
|
|
},
|
|
(false, true) => Color {
|
|
r: 128,
|
|
g: 128,
|
|
b: 128,
|
|
},
|
|
(true, true) => Color {
|
|
r: 255,
|
|
g: 255,
|
|
b: 255,
|
|
},
|
|
},
|
|
);
|
|
}
|
|
}
|
|
// for
|
|
// let pat = self.memory.peek();
|
|
}
|
|
}
|
|
}
|
|
pub fn render_pattern_tables<R: Renderer>(&self, frame: &mut Frame<R>) {
|
|
for y in 0..16 {
|
|
for x in 0..16 {
|
|
let name = (y * 16 + x) * 16;
|
|
for y_off in 0..8 {
|
|
let low = self.memory.peek(name + y_off).unwrap();
|
|
let high = self.memory.peek(name + y_off + 8).unwrap();
|
|
for bit in 0..8 {
|
|
frame.fill_rectangle(
|
|
Point::new(
|
|
x as f32 * 8. + 8. - bit as f32,
|
|
y as f32 * 8. + y_off as f32,
|
|
),
|
|
Size::new(1., 1.),
|
|
match (low & (1 << bit) != 0, high & (1 << bit) != 0) {
|
|
(false, false) => Color { r: 0, g: 0, b: 0 },
|
|
(true, false) => Color {
|
|
r: 64,
|
|
g: 64,
|
|
b: 64,
|
|
},
|
|
(false, true) => Color {
|
|
r: 128,
|
|
g: 128,
|
|
b: 128,
|
|
},
|
|
(true, true) => Color {
|
|
r: 255,
|
|
g: 255,
|
|
b: 255,
|
|
},
|
|
},
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
for y in 0..16 {
|
|
for x in 0..16 {
|
|
let name = (y * 16 + x) * 16;
|
|
for y_off in 0..8 {
|
|
let low = self.memory.peek(name + y_off + 0x1000).unwrap();
|
|
let high = self.memory.peek(name + y_off + 8 + 0x1000).unwrap();
|
|
for bit in 0..8 {
|
|
frame.fill_rectangle(
|
|
Point::new(
|
|
x as f32 * 8. + 8. - bit as f32,
|
|
y as f32 * 8. + y_off as f32 + 130.,
|
|
),
|
|
Size::new(1., 1.),
|
|
match (low & (1 << bit) != 0, high & (1 << bit) != 0) {
|
|
(false, false) => Color { r: 0, g: 0, b: 0 },
|
|
(true, false) => Color {
|
|
r: 64,
|
|
g: 64,
|
|
b: 64,
|
|
},
|
|
(false, true) => Color {
|
|
r: 128,
|
|
g: 128,
|
|
b: 128,
|
|
},
|
|
(true, true) => Color {
|
|
r: 255,
|
|
g: 255,
|
|
b: 255,
|
|
},
|
|
},
|
|
);
|
|
}
|
|
}
|
|
// for
|
|
// let pat = self.memory.peek();
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn render_palette<R: Renderer>(&self, frame: &mut Frame<R>) {
|
|
for y in 0..8 {
|
|
for x in 0..4 {
|
|
frame.fill_rectangle(
|
|
Point::new(x as f32 * 10., y as f32 * 10.),
|
|
Size::new(10., 10.),
|
|
self.palette.colors[(self.palette.ram[x + y * 4] & 0x3F) as usize],
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn ppu_registers() {
|
|
let mut ppu = PPU::with_chr_rom(&[0u8; 8192]);
|
|
assert_eq!(ppu.background.v, 0);
|
|
assert_eq!(ppu.background.t, 0);
|
|
assert_eq!(ppu.background.x, 0);
|
|
assert_eq!(ppu.background.w, false);
|
|
ppu.write_reg(0, 0);
|
|
assert_eq!(ppu.background.v, 0);
|
|
ppu.write_reg(0, 0b11);
|
|
assert_eq!(
|
|
ppu.background.t, 0b0001100_00000000,
|
|
"Actual: {:016b}",
|
|
ppu.background.t
|
|
);
|
|
assert_eq!(ppu.background.w, false);
|
|
|
|
ppu.write_reg(5, 0x7D);
|
|
assert_eq!(
|
|
ppu.background.t, 0b0001100_00001111,
|
|
"Actual: {:016b}",
|
|
ppu.background.t
|
|
);
|
|
assert_eq!(ppu.background.x, 0b101);
|
|
assert_eq!(ppu.background.w, true);
|
|
ppu.write_reg(5, 0x5E);
|
|
assert_eq!(
|
|
ppu.background.t, 0b1101101_01101111,
|
|
"Actual: {:016b}",
|
|
ppu.background.t
|
|
);
|
|
assert_eq!(ppu.background.x, 0b101);
|
|
assert_eq!(ppu.background.w, false);
|
|
|
|
ppu.write_reg(5, 0x7D);
|
|
assert_eq!(
|
|
ppu.background.t, 0b1101101_01101111,
|
|
"Actual: {:016b}",
|
|
ppu.background.t
|
|
);
|
|
assert_eq!(ppu.background.x, 0b101);
|
|
assert_eq!(ppu.background.w, true);
|
|
ppu.read_reg(2);
|
|
assert_eq!(ppu.background.w, false);
|
|
}
|
|
}
|