Created screen array
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1 changed files with 206 additions and 59 deletions
265
src/main.rs
265
src/main.rs
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@ -16,60 +16,191 @@ use cp437::GLYPHS;
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const SCREEN_HEIGHT: u32 = 350;
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const SCREEN_WIDTH: u32 = 640;
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const EGA_COLORS: [Color; 16] = [
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Color::RGB(0x00, 0x00, 0x00), // Black
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Color::RGB(0x00, 0x00, 0xaa), // Blue
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Color::RGB(0x00, 0xaa, 0x00), // Green
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Color::RGB(0x00, 0xaa, 0xaa), // Cyan
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Color::RGB(0xaa, 0x00, 0x00), // Red
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Color::RGB(0xaa, 0x00, 0xaa), // Magenta
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Color::RGB(0xaa, 0x55, 0x00), // Brown
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Color::RGB(0xaa, 0xaa, 0xaa), // White / Light Gray
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Color::RGB(0x55, 0x55, 0x55), // Dark Gray / Bright Black
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Color::RGB(0x55, 0x55, 0xff), // Bright Blue
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Color::RGB(0x55, 0xff, 0x55), // Bright Green
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Color::RGB(0x55, 0xff, 0xff), // Bright Cyan
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Color::RGB(0xff, 0x55, 0x55), // Bright Red
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Color::RGB(0xff, 0x55, 0xff), // Bright Magenta
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Color::RGB(0xff, 0xff, 0x55), // Bright Yellow
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Color::RGB(0xff, 0xff, 0xff), // Bright White
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];
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const GLYPH_COLUMNS: u8 = 80;
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const GLYPH_ROWS: u8 = 25;
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pub fn textattr_to_int(back: u8, fore: u8, codepoint: u8, blink: bool) -> usize {
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let num = (usize::from(blink) << 15) +
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(usize::from(back) << 12) +
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(usize::from(fore) << 8) +
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usize::from(codepoint);
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num
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const GLYPH_HEIGHT: u8 = 14;
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const GLYPH_WIDTH: u8 = 8;
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// Total glyph textures = 256 glyphs * 16 foreground colors * 8 background colors
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const TOTAL_GLYPH_TEXTURES: usize = 256 * 16 * 8;
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// Total screen blocks = GLYPH_COLUMNS * GLYPH_ROWS
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const TOTAL_SCREEN_BLOCKS: usize = 2000;
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pub enum EgaColors {
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Black,
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Blue,
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Green,
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Cyan,
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Red,
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Magenta,
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Brown,
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LightGray,
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DarkGray,
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BrightBlue,
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BrightGreen,
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BrightCyan,
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BrightRed,
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BrightMagenta,
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BrightYellow,
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White,
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}
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pub fn int_to_textattr(num: usize) -> (u8, u8, u8, bool) {
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let blink = (num >> 15) != 0;
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let back = (num >> 12) as u8;
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let fore = ((num >> 8) & 15) as u8;
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let codepoint = (num & 255) as u8;
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(back, fore, codepoint, blink)
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impl EgaColors {
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pub fn as_u8(color: EgaColors) -> u8 {
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let num = match color {
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EgaColors::Black => 0,
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EgaColors::Blue => 1,
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EgaColors::Green => 2,
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EgaColors::Cyan => 3,
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EgaColors::Red => 4,
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EgaColors::Magenta => 5,
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EgaColors::Brown => 6,
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EgaColors::LightGray => 7,
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EgaColors::DarkGray => 8,
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EgaColors::BrightBlue => 9,
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EgaColors::BrightGreen => 10,
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EgaColors::BrightCyan => 11,
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EgaColors::BrightRed => 12,
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EgaColors::BrightMagenta => 13,
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EgaColors::BrightYellow => 14,
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EgaColors::White => 15,
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};
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num
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}
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pub fn from_enum(color: EgaColors) -> Color {
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let col = match color {
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EgaColors::Black => Color::RGB(0x00, 0x00, 0x00),
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EgaColors::Blue => Color::RGB(0x00, 0x00, 0xaa),
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EgaColors::Green => Color::RGB(0x00, 0xaa, 0x00),
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EgaColors::Cyan => Color::RGB(0x00, 0xaa, 0xaa),
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EgaColors::Red => Color::RGB(0xaa, 0x00, 0x00),
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EgaColors::Magenta => Color::RGB(0xaa, 0x00, 0xaa),
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EgaColors::Brown => Color::RGB(0xaa, 0x55, 0x00),
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EgaColors::LightGray => Color::RGB(0xaa, 0xaa, 0xaa),
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EgaColors::DarkGray => Color::RGB(0x55, 0x55, 0x55),
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EgaColors::BrightBlue => Color::RGB(0x55, 0x55, 0xff),
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EgaColors::BrightGreen => Color::RGB(0x55, 0xff, 0x55),
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EgaColors::BrightCyan => Color::RGB(0x55, 0xff, 0xff),
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EgaColors::BrightRed => Color::RGB(0xff, 0x55, 0x55),
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EgaColors::BrightMagenta => Color::RGB(0xff, 0x55, 0xff),
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EgaColors::BrightYellow => Color::RGB(0xff, 0xff, 0x55),
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EgaColors::White => Color::RGB(0xff, 0xff, 0xff),
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};
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col
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}
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pub fn from_u8(num: u8) -> Color {
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let col = match num {
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0 => Color::RGB(0x00, 0x00, 0x00),
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1 => Color::RGB(0x00, 0x00, 0xaa),
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2 => Color::RGB(0x00, 0xaa, 0x00),
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3 => Color::RGB(0x00, 0xaa, 0xaa),
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4 => Color::RGB(0xaa, 0x00, 0x00),
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5 => Color::RGB(0xaa, 0x00, 0xaa),
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6 => Color::RGB(0xaa, 0x55, 0x00),
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7 => Color::RGB(0xaa, 0xaa, 0xaa),
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8 => Color::RGB(0x55, 0x55, 0x55),
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9 => Color::RGB(0x55, 0x55, 0xff),
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10 => Color::RGB(0x55, 0xff, 0x55),
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11 => Color::RGB(0x55, 0xff, 0xff),
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12 => Color::RGB(0xff, 0x55, 0x55),
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13 => Color::RGB(0xff, 0x55, 0xff),
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14 => Color::RGB(0xff, 0xff, 0x55),
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15 => Color::RGB(0xff, 0xff, 0xff),
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_ => panic!("Unknown value for EgaColors: {}", num),
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};
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col
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}
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}
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pub fn render(canvas: &mut WindowCanvas, color: Color, texture: &Texture) {
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canvas.set_draw_color(color);
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#[derive(Clone, Copy)]
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pub struct ScreenBlock {
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blink: bool,
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background: u8,
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foreground: u8,
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glyph: u8,
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}
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impl ScreenBlock {
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pub fn new(blink: bool, background: u8, foreground: u8, glyph: u8) -> Self {
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ScreenBlock { blink, background, foreground, glyph }
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}
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pub fn attrs_to_index(blink: bool, background: u8, foreground: u8, glyph: u8) -> usize {
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let num = (usize::from(blink) << 15) +
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(usize::from(background) << 12) +
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(usize::from(foreground) << 8) +
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usize::from(glyph);
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num
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}
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pub fn index_to_attrs(num: usize) -> (bool, u8, u8, u8) {
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let blink = (num >> 15) != 0;
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let back = (num >> 12) as u8;
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let fore = ((num >> 8) & 15) as u8;
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let glyph = (num & 255) as u8;
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(blink, back, fore, glyph)
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}
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pub fn as_texture_index(&self) -> usize {
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let num = ScreenBlock::attrs_to_index(
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self.blink,
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self.background,
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self.foreground,
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self.glyph
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);
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num
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}
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pub fn from_texture_index(num: usize) -> Self {
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let (blink, background, foreground, glyph) = ScreenBlock::index_to_attrs(num);
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ScreenBlock { blink, background, foreground, glyph }
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}
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}
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pub fn block_to_canvas(
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canvas: &mut WindowCanvas,
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textures: &Vec<Texture>,
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x: u8,
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y: u8,
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block: &ScreenBlock) {
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let tex_idx = block.as_texture_index();
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let dest_x = match x {
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n if (0..=GLYPH_COLUMNS - 1).contains(&n) => GLYPH_WIDTH as i32 * x as i32,
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//0..=79 => GLYPH_WIDTH as i32 * x as i32,
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_ => panic!("x is out of range! Must be 0..79 inclusive."),
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};
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let dest_y = match y {
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n if (0..=GLYPH_ROWS - 1).contains(&n) => GLYPH_HEIGHT as i32 * y as i32,
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//0..=24 => GLYPH_HEIGHT as i32 * y as i32,
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_ => panic!("y is out of range! Must be 0..24 inclusive."),
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};
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match canvas.copy(
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&textures[tex_idx],
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Rect::new(0, 0, u32::from(GLYPH_WIDTH), u32::from(GLYPH_HEIGHT)),
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Rect::new(dest_x, dest_y, u32::from(GLYPH_WIDTH), u32::from(GLYPH_HEIGHT)),
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) {
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Ok(()) => (),
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Err(err) => panic!("Unable to copy texture to canvas! SDL Error: {}", err),
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};
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}
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pub fn render(canvas: &mut WindowCanvas, textures: &Vec<Texture>, screen: &[ScreenBlock]) {
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canvas.set_draw_color(EgaColors::from_enum(EgaColors::Black));
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canvas.clear();
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match canvas.copy(texture, Rect::new(0, 0, 8, 14), Rect::new(0, 0, 8, 14)) {
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Ok(()) => (),
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Err(err) => panic!("Unable to copy texture to canvas! SDL Error: {}", err),
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};
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match canvas.copy(texture, Rect::new(0, 0, 8, 14), Rect::new(8, 0, 8, 14)) {
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Ok(()) => (),
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Err(err) => panic!("Unable to copy texture to canvas! SDL Error: {}", err),
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};
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match canvas.copy(texture, Rect::new(0, 0, 8, 14), Rect::new(16, 0, 8, 14)) {
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Ok(()) => (),
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Err(err) => panic!("Unable to copy texture to canvas! SDL Error: {}", err),
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};
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for (idx, block) in screen.iter().enumerate() {
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let x = (idx % GLYPH_COLUMNS as usize) as u8;
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let y = (idx / GLYPH_COLUMNS as usize) as u8;
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block_to_canvas(canvas, &textures, x, y, block);
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}
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canvas.present();
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}
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@ -100,9 +231,9 @@ pub fn main() {
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let texture_creator = canvas.texture_creator();
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let mut glyph_textures: Vec<Texture> = Vec::new();
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for tex_idx in 0..=32767 {
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let (back, fore, cp, _) = int_to_textattr(tex_idx);
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let mut texture = match texture_creator.create_texture_streaming(PixelFormatEnum::RGB24, 8, 14) {
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for tex_idx in 0..TOTAL_GLYPH_TEXTURES {
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let (_, back, fore, cp) = ScreenBlock::index_to_attrs(tex_idx);
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let mut texture = match texture_creator.create_texture_streaming(PixelFormatEnum::RGB24, u32::from(GLYPH_WIDTH), u32::from(GLYPH_HEIGHT)) {
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Ok(texture) => texture,
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Err(err) => panic!("SDL could not create texture. SDL Error: {}", err),
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};
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@ -112,13 +243,13 @@ pub fn main() {
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for (x, pixel) in bits.iter().enumerate() {
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let offset = y * pitch + x * 3;
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if pixel == false {
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buffer[offset] = EGA_COLORS[back as usize].r;
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buffer[offset + 1] = EGA_COLORS[back as usize].g;
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buffer[offset + 2] = EGA_COLORS[back as usize].b;
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buffer[offset] = EgaColors::from_u8(back).r;
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buffer[offset + 1] = EgaColors::from_u8(back).g;
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buffer[offset + 2] = EgaColors::from_u8(back).b;
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} else {
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buffer[offset] = EGA_COLORS[fore as usize].r;
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buffer[offset + 1] = EGA_COLORS[fore as usize].g;
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buffer[offset + 2] = EGA_COLORS[fore as usize].b;
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buffer[offset] = EgaColors::from_u8(fore).r;
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buffer[offset + 1] = EgaColors::from_u8(fore).g;
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buffer[offset + 2] = EgaColors::from_u8(fore).b;
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}
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}
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}
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@ -128,13 +259,29 @@ pub fn main() {
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};
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glyph_textures.push(texture);
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}
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render(&mut canvas, Color::RGB(0, 0, 0), &glyph_textures[3762]);
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let mut dos_screen: [ScreenBlock; TOTAL_SCREEN_BLOCKS] = [ScreenBlock::new(false, EgaColors::as_u8(EgaColors::Black), EgaColors::as_u8(EgaColors::Black), 0); TOTAL_SCREEN_BLOCKS];
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for col in 0..60 {
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dos_screen[col as usize] = ScreenBlock::new(false, EgaColors::as_u8(EgaColors::Black), EgaColors::as_u8(EgaColors::BrightYellow), 178);
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}
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for row in 1..GLYPH_ROWS-1 {
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let idx = row as usize * GLYPH_COLUMNS as usize;
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dos_screen[idx] = ScreenBlock::new(false, EgaColors::as_u8(EgaColors::Black), EgaColors::as_u8(EgaColors::BrightYellow), 178);
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dos_screen[idx + 59] = ScreenBlock::new(false, EgaColors::as_u8(EgaColors::Black), EgaColors::as_u8(EgaColors::BrightYellow), 178);
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}
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for col in 0..60 {
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let idx = (GLYPH_ROWS - 1) as usize * GLYPH_COLUMNS as usize + col as usize;
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dos_screen[idx] = ScreenBlock::new(false, EgaColors::as_u8(EgaColors::Black), EgaColors::as_u8(EgaColors::BrightYellow), 178);
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}
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render(&mut canvas, &glyph_textures, &dos_screen);
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let mut event_pump = match sdl_context.event_pump() {
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Ok(event_pump) => event_pump,
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Err(err) => panic!("Could not obtain SDL2 Event Pump! SDL_Error: {}", err),
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};
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'running: loop {
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for event in event_pump.poll_iter() {
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match event {
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@ -146,7 +293,7 @@ pub fn main() {
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}
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}
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render(&mut canvas, Color::RGB(0, 0, 0), &glyph_textures[3762]);
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render(&mut canvas, &glyph_textures, &dos_screen);
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sleep(Duration::new(0, 1_000_000_000u32 / 60));
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}
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}
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