Starts adding fontplate for VGA

bench/programs_rust/fpga-lib-macros/Cargo.toml

@@ -7,6 +7,8 @@ edition = "2024"
 proc-macro = true
 
 [dependencies]
+image = "0.25.5"
+regex = "1.11.1"
 proc-macro2 = "1.0"
 quote = "1.0"
 syn = { version = "2.0", features = ["full"] }

bench/programs_rust/fpga-lib-macros/src/image.rs

@@ -0,0 +1,106 @@
+use image::{ImageBuffer, Luma};
+use proc_macro::{Span, TokenStream};
+use quote::quote;
+use regex::Regex;
+use syn::parse::Parse;
+
+fn remove_non_alphanumeric(input: &str) -> String {
+    let re = Regex::new(r"[^a-zA-Z0-9_]+").unwrap();
+    re.replace_all(input, "").to_string()
+}
+
+fn to_format(img: ImageBuffer<Luma<u8>, Vec<u8>>, width: usize, height: usize) -> Vec<u8> {
+    let mut output = Vec::new();
+
+    let mut bit: u8 = 0;
+    let mut byte: u8 = 0;
+    for y in 0..height {
+        for x in 0..width {
+            let pixel = img.get_pixel(x as u32, y as u32)[0];
+            if pixel >= 127 {
+                byte |= 1 << bit;
+            }
+            bit += 1;
+            if bit == 8 {
+                output.push(byte);
+                byte = 0;
+                bit = 0;
+            }
+        }
+    }
+    if bit != 0 {
+        output.push(byte);
+    }
+    output
+}
+
+fn path_to_image(path: &str) -> (Vec<u8>, String, usize, usize) {
+    let img = match image::open(path) {
+        Ok(img) => img.to_luma8(),
+        Err(e) => panic!("failed to open image {}: {}", path, e),
+    };
+
+    let width = img.width() as usize;
+    let height = img.height() as usize;
+
+    let bytes = to_format(img, width, height);
+
+    let path = path
+        .split('/')
+        .next_back()
+        .expect("failed to get last part of path");
+    let split: Vec<_> = path.split('.').collect();
+    let name = remove_non_alphanumeric(&split[0..split.len() - 1].join(".")).to_uppercase();
+
+    (bytes, name, width, height)
+}
+
+struct ParsedArgs {
+    path: String,
+}
+
+impl Parse for ParsedArgs {
+    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+        let path: syn::LitStr = input.parse()?;
+        let path = path.value();
+        Ok(ParsedArgs { path })
+    }
+}
+
+pub fn parse_image(
+    input: TokenStream,
+) -> Result<
+    (
+        u8,
+        u8,
+        proc_macro2::Ident,
+        usize,
+        Vec<proc_macro2::TokenStream>,
+    ),
+    syn::Error,
+> {
+    // parse the input into a comma separated list of arguments
+    let parsed_args = syn::parse::<ParsedArgs>(input)?;
+    // let parsed_args = parse_macro_input!(input as ParsedArgs);
+    let (bytes, name, width, height) = path_to_image(&parsed_args.path);
+
+    let width = width as u8;
+    let height = height as u8;
+
+    let byte_array = bytes.as_slice();
+    let byte_count = byte_array.len();
+
+    let name_ident = syn::Ident::new(&name, Span::call_site().into());
+
+    let byte_tokens = bytes.iter().map(|b| quote! { #b }).collect::<Vec<_>>();
+    Ok((width, height, name_ident, byte_count, byte_tokens))
+}
+
+pub fn include_font_plate_impl(input: TokenStream) -> TokenStream {
+    let (_, _, _, _, byte_tokens) = parse_image(input).unwrap();
+
+    let output = quote! {
+        [#(#byte_tokens),*]
+    };
+    output.into()
+}

bench/programs_rust/fpga-lib-macros/src/lib.rs

@@ -1,4 +1,5 @@
-extern crate proc_macro;
+mod image;
+
 use proc_macro::TokenStream;
 use quote::{format_ident, quote};
 
@@ -32,3 +33,8 @@ pub fn define_regs(_input: TokenStream) -> TokenStream {
 
     tokens.into()
 }
+
+#[proc_macro]
+pub fn include_font_plate(input: TokenStream) -> TokenStream {
+    image::include_font_plate_impl(input)
+}

bench/programs_rust/fpga-lib/src/lib.rs

@@ -1,6 +1,7 @@
 #![no_std]
 
 pub mod register;
+pub mod vga;
 
 #[macro_export]
 macro_rules! panic_handler {

bench/programs_rust/fpga-lib/src/vga.rs

@@ -0,0 +1,48 @@
+use fpga_lib_macros::include_font_plate;
+
+pub const VGA_ADDRESS: *mut Color = 0x80000000 as *mut Color;
+pub const WIDTH: usize = 320;
+pub const HEIGHT: usize = 240;
+
+#[repr(transparent)]
+pub struct Color(pub(crate) u8);
+
+impl Color {
+    pub const fn from_rgb(r: u8, g: u8, b: u8) -> Self {
+        Self(((r >> 6) << 6) | ((g >> 5) << 3) | (b >> 5))
+    }
+}
+
+pub const WHITE: Color = Color::from_rgb(255, 255, 255);
+pub const GRAY: Color = Color::from_rgb(128, 128, 128);
+pub const LIGHT_GRAY: Color = Color::from_rgb(128, 64, 64);
+pub const BLACK: Color = Color::from_rgb(0, 0, 0);
+pub const RED: Color = Color::from_rgb(255, 0, 0);
+pub const GREEN: Color = Color::from_rgb(0, 255, 0);
+pub const BLUE: Color = Color::from_rgb(0, 0, 255);
+
+pub struct VGA {}
+
+impl VGA {
+    /// # Safety
+    /// `x` must be less than `WIDTH` and `y` must be less than `HEIGHT`
+    pub unsafe fn write_pixel_unsafe(x: u16, y: u16, color: Color) {
+        unsafe { *VGA_ADDRESS.add(x as usize + y as usize * WIDTH) = color }
+    }
+
+    pub unsafe fn draw_char(x: u16, y: u16, c: char) {
+        let c = c as u8 - b' ';
+        for i in 0..FONT_HEIGHT {
+            for j in 0..FONT_WIDTH {
+                
+            }
+        }
+    }
+}
+
+pub const FONT_WIDTH: usize = 6;
+pub const FONT_HEIGHT: usize = 13;
+pub const FONTPLATE_WIDTH: usize = 32 * FONT_WIDTH;
+pub const FONTPLATE_HEIGHT: usize = 3 * FONT_HEIGHT;
+pub const FONTPLATE_SIZE: usize = FONTPLATE_WIDTH * FONTPLATE_HEIGHT / 8;
+pub const FONTPLATE: [u8; FONTPLATE_SIZE] = include_font_plate! {"fontplate.png"};

bench/programs_rust/hello-rust/src/main.rs

@@ -3,7 +3,11 @@
 
 use core::arch::asm;
 
-use fpga_lib::{panic_handler, register::X31};
+use fpga_lib::{
+    panic_handler,
+    register::X31,
+    vga::{VGA, WHITE},
+};
 
 panic_handler! {}
 
@@ -17,9 +21,7 @@ pub extern "C" fn _start() -> ! {
             "add x31, x0, {}", in(reg) test
         );
 
-        const VGA: *mut u8 = 0x80000000 as *mut u8;
-        VGA.write_volatile(255);
-        // VGA.add(1).write_volatile(255);
+        VGA::write_pixel_unsafe(0, 0, WHITE);
     }
 
     loop {}