212 lines
6.5 KiB
Rust
212 lines
6.5 KiB
Rust
use super::{GraphicsWriter, Screen};
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use crate::{
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colors::{Color16, DEFAULT_PALETTE},
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drawing::{Bresenham, Point},
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registers::{PlaneMask, WriteMode},
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vga::{VideoMode, VGA},
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};
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use core::convert::From;
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use font8x8::UnicodeFonts;
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const WIDTH: usize = 640;
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const HEIGHT: usize = 480;
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const SIZE: usize = (WIDTH * HEIGHT) / 8;
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const WIDTH_IN_BYTES: usize = WIDTH / 8;
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/// A basic interface for interacting with vga graphics mode 640x480x16
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///
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/// # Examples
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///
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/// Basic usage:
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///
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/// ```no_run
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/// use vga::colors::Color16;
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/// use vga::writers::{Graphics640x480x16, GraphicsWriter};
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/// let mode = Graphics640x480x16::new();
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/// mode.set_mode();
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/// mode.clear_screen(Color16::Black);
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/// mode.draw_line((80, 60), (80, 420), Color16::White);
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/// mode.draw_line((80, 60), (540, 60), Color16::White);
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/// mode.draw_line((80, 420), (540, 420), Color16::White);
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/// mode.draw_line((540, 420), (540, 60), Color16::White);
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/// mode.draw_line((80, 90), (540, 90), Color16::White);
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/// for (offset, character) in "Hello World!".chars().enumerate() {
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/// mode.draw_character(270 + offset * 8, 72, character, Color16::White)
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/// }
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/// ```
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#[derive(Debug, Clone, Copy, Default)]
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pub struct Graphics640x480x16;
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impl Screen for Graphics640x480x16 {
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const WIDTH: usize = WIDTH;
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const HEIGHT: usize = HEIGHT;
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const SIZE: usize = SIZE;
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}
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impl GraphicsWriter<Color16> for Graphics640x480x16 {
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fn clear_screen(&self, color: Color16) {
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self.set_write_mode_2();
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unsafe {
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self.get_frame_buffer()
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.write_bytes(u8::from(color), Self::SIZE);
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}
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}
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fn draw_line(&self, start: Point<isize>, end: Point<isize>, color: Color16) {
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self.set_write_mode_0(color);
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for (x, y) in Bresenham::new(start, end) {
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self._set_pixel(x as usize, y as usize, color);
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}
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}
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fn draw_character(&self, x: usize, y: usize, character: char, color: Color16) {
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self.set_write_mode_2();
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let character = match font8x8::BASIC_FONTS.get(character) {
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Some(character) => character,
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// Default to a filled block if the character isn't found
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None => font8x8::unicode::BLOCK_UNICODE[8].byte_array(),
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};
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for (row, byte) in character.iter().enumerate() {
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for bit in 0..8 {
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match *byte & 1 << bit {
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0 => (),
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_ => self._set_pixel(x + bit, y + row, color),
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}
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}
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}
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}
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/// **Note:** This method is provided for convenience, but has terrible
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/// performance since it needs to ensure the correct `WriteMode` per pixel
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/// drawn. If you need to draw more then one pixel, consider using a method
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/// such as `draw_line`.
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fn set_pixel(&self, x: usize, y: usize, color: Color16) {
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self.set_write_mode_2();
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self._set_pixel(x, y, color);
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}
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fn set_mode(&self) {
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let mut vga = VGA.lock();
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vga.set_video_mode(VideoMode::Mode640x480x16);
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// Some bios mess up the palette when switching modes,
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// so explicitly set it.
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vga.color_palette_registers.load_palette(&DEFAULT_PALETTE);
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}
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}
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impl Graphics640x480x16 {
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/// Creates a new `Graphics640x480x16`.
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pub const fn new() -> Graphics640x480x16 {
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Graphics640x480x16
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}
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fn set_write_mode_0(self, color: Color16) {
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let mut vga = VGA.lock();
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vga.graphics_controller_registers.write_set_reset(color);
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vga.graphics_controller_registers
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.write_enable_set_reset(0xF);
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vga.graphics_controller_registers
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.set_write_mode(WriteMode::Mode0);
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}
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fn set_write_mode_2(self) {
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let mut vga = VGA.lock();
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vga.graphics_controller_registers
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.set_write_mode(WriteMode::Mode2);
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vga.graphics_controller_registers.set_bit_mask(0xFF);
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vga.sequencer_registers
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.set_plane_mask(PlaneMask::ALL_PLANES);
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}
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#[inline]
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fn _set_pixel(self, x: usize, y: usize, color: Color16) {
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if x < 640 && y < 480 {
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let frame_buffer = self.get_frame_buffer();
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let offset = x / 8 + y * WIDTH_IN_BYTES;
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let pixel_mask = 0x80 >> (x & 0x07);
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VGA.lock()
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.graphics_controller_registers
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.set_bit_mask(pixel_mask);
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unsafe {
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frame_buffer.add(offset).read_volatile();
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frame_buffer.add(offset).write_volatile(u8::from(color));
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}
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}
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}
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}
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use ab_glyph::{Font, FontRef, Glyph};
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use log::trace;
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use spin::Lazy;
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const FONT_BASIC: Lazy<FontRef> = Lazy::new({
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|| FontRef::try_from_slice(include_bytes!("../../assets/fonts/unifont-14.0.01.ttf")).unwrap()
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});
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const FONT_SUPPLEMENTARY: Lazy<FontRef> = Lazy::new(|| {
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FontRef::try_from_slice(include_bytes!(
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"../../assets/fonts/unifont_upper-14.0.01.ttf"
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))
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.unwrap()
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});
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const FONT_SCALE: f32 = 14.0;
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const GLYPH_HEIGHT: f32 = 10.0;
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const GLYPH_WIDTH: f32 = 8.0;
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impl Graphics640x480x16 {
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/// Draw a glyph on the screen at the given position
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///
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/// # Arguments
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/// * `x` - the x position of the glyph
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/// * `y` - the y position of the glyph
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/// * `glyph` - the glyph to draw
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/// * `color` - the color of the glyph
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pub fn draw_unicode_char(&self, mut x: usize, mut y: usize, character: char, color: Color16) {
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self.set_write_mode_2();
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// trace!("Char {}", character);
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// if character == '\n' {
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// return;
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// }
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if x == 80 {
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x = 0;
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y += 1;
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}
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if character != '\0' {
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let real_x = x as f32 * GLYPH_WIDTH;
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let real_y = (y as f32 + 1.0) * GLYPH_HEIGHT;
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// trace!("REALX{}\nREALY{}", real_x, real_y);
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let in_supp_plane = character as u32 > 0xffff;
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let plane = match in_supp_plane {
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false => FONT_BASIC,
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true => FONT_SUPPLEMENTARY,
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};
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let q_glyph: Glyph = plane
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.glyph_id(character)
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.with_scale_and_position(FONT_SCALE, ab_glyph::point(real_x, real_y));
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if let Some(q) = plane.outline_glyph(q_glyph) {
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q.draw(|gx, gy, c| {
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if c > 0.1 {
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let corner = q.px_bounds().min;
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self._set_pixel(
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gx as usize + corner.x as usize,
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gy as usize + corner.y as usize,
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color,
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);
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}
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});
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}
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}
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}
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}
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