Quine shader!

text_shader/src/main.rs

@@ -0,0 +1,79 @@
+use std::{
+    fs::{read_to_string, File},
+    io::Write,
+};
+
+use image::{GenericImageView, ImageReader};
+
+const FULL_CHARSET: &[u8] = b" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\n\t";
+
+fn main() {
+    const A:u8 = FULL_CHARSET[64];
+    // source code conversion
+    let source_text = read_to_string("../Assets/test/quine.shader").unwrap();
+    let mut encoded_text: Vec<u32> = Vec::new();
+    let mut temp = 0;
+    let mut i = 0;
+    let mut blob_start = 0;
+    for (index, char) in source_text.chars().enumerate() {
+        if char == '?' {
+            blob_start = index;
+        }
+
+        temp <<= 8;
+        let char_index = FULL_CHARSET
+            .iter()
+            .position(|&c| c == char as u8)
+            .unwrap_or_else(|| {
+                println!("char {char:?} not in charset");
+                0
+            });
+        temp |= (char_index as u32) & 0xff;
+        i += 1;
+        if i == 4 {
+            i = 0;
+            encoded_text.push(temp);
+            temp = 0;
+        }
+    }
+    let mut out_string = String::new();
+    out_string += "\t\t\t\tconst uint text[] = {";
+    for t in &encoded_text {
+        out_string += &format!("{t:#010x},");
+    }
+    out_string += "};\n";
+    out_string += &format!("\t\t\t\tconst uint text_len = {};\n", encoded_text.len());
+    out_string += &format!("\t\t\t\tconst uint blob_start = {blob_start};\n");
+
+    // font
+    let img = ImageReader::open("vgafont.png").unwrap().decode().unwrap();
+    let mut out = Vec::new();
+    for &c in FULL_CHARSET {
+        let col = c as u32 & 0b1_1111;
+        let row = (c as u32 >> 5) & 0b111;
+        let mut encoded: [u32; 4] = [0; 4];
+        for section in 0..4 {
+            for y in 0..4 {
+                for x in 0..8 {
+                    let px = col * 9 + x;
+                    let py = row * 16 + (16 - 1 - section * 4) - y;
+                    let pixel = (img.get_pixel(px, py).0[0] != 0) as u32;
+                    let offset = x + ((y & 3) << 3);
+                    encoded[section as usize] |= pixel << offset;
+                }
+            }
+        }
+        out.push(encoded);
+    }
+
+    out_string += "\n\t\t\t\tconst uint font_a[48][4] = {";
+    for (i, c) in out.iter().enumerate() {
+        if i == 48 {
+            out_string += &format!("}};\n\t\t\t\tconst uint font_b[{}][4] = {{", out.len() - 48);
+        }
+        out_string += &format!("{{{},{},{},{}}},", c[0], c[1], c[2], c[3]);
+    }
+    out_string += "};\n";
+    let mut file = File::create("out.h").unwrap();
+    file.write_all(out_string.as_bytes()).unwrap();
+}