nibble8 0.1.1

Yet another Rust implementation of a Chip-8 interpreter, using sdl2.
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use sdl2::{pixels::Color, rect::Point, render::Canvas, video::Window, Sdl};

use crate::{
    bit_utils::get_bit_from_byte,
    machine::chip8::{DISPLAY_COLS, DISPLAY_ROWS},
};

use super::chip8_display::Chip8Display;

pub struct SDLDisplay {
    canvas: Canvas<Window>,
}

impl SDLDisplay {
    pub fn init<'a>(sdl_context: &'a Sdl, width: u32, height: u32) -> Self {
        let video_subsystem = sdl_context.video().unwrap();
        let window = video_subsystem
            .window("nibble8", width, height)
            .position_centered()
            .build()
            .unwrap();

        let mut canvas = window.into_canvas().build().unwrap();
        canvas
            .set_scale(
                (width / DISPLAY_COLS as u32) as f32,
                (height / DISPLAY_ROWS as u32) as f32,
            )
            .unwrap();
        canvas.set_draw_color(Color::BLACK);
        canvas.clear();
        canvas.present();
        SDLDisplay { canvas }
    }
}

impl Chip8Display for SDLDisplay {
    fn draw(&mut self, bytes: &[u8]) {
        self.canvas.set_draw_color(Color::BLACK);
        self.canvas.clear();
        self.canvas.set_draw_color(Color::GREEN);

        let mut row = 0;
        let mut col = 0;
        for byte in bytes {
            for bit in 0..8 {
                if col == DISPLAY_COLS {
                    row += 1;
                    col = 0;
                }
                let is_on = get_bit_from_byte(bit, byte);
                if is_on {
                    self.canvas.draw_point(Point::new(col as i32, row)).unwrap();
                }
                col += 1;
            }
        }
        self.canvas.present();
    }
}