add texture import/export system for light client

1 files changed, 77 insertions, 0 deletions

diff --git a/light-client/tools/src/bin/tex_pack.rs b/light-client/tools/src/bin/tex_pack.rs
new file mode 100644
index 00000000..23056608
--- /dev/null
+++ b/light-client/tools/src/bin/tex_pack.rs
@@ -0,0 +1,77 @@
+use clap::Parser;
+use std::{
+    fs::File,
+    io::{BufRead, BufReader, BufWriter, Write},
+    path::PathBuf,
+};
+
+#[derive(Parser)]
+struct Args {
+    atlas_out: PathBuf,
+    atlas_meta_out: PathBuf,
+    inputs: Vec<PathBuf>,
+}
+
+fn main() {
+    let Args {
+        inputs,
+        atlas_meta_out,
+        atlas_out,
+    } = Args::parse();
+
+    let atlas_size = 1024;
+
+    let mut cursor_x = 0;
+    let mut cursor_y = 0;
+    let mut row_height = 0;
+
+    let mut texels = vec![vec![' '; atlas_size]; atlas_size];
+    let mut metadata = Vec::new();
+
+    for path in inputs {
+        let file = BufReader::new(File::open(&path).unwrap());
+        let tex = file.lines().map(Result::unwrap).collect::<Vec<String>>();
+        let (width, height) = (tex[0].len(), tex.len());
+
+        if cursor_x + width > atlas_size {
+            cursor_y += row_height;
+            row_height = 0;
+            cursor_x = 0;
+        }
+        if cursor_y + height > atlas_size {
+            panic!("texture too big or atlas full")
+        }
+        row_height = row_height.max(atlas_size);
+        let texcoord = [cursor_x, cursor_y];
+
+        for (y, line) in tex.iter().enumerate() {
+            if line.is_empty() {
+                continue;
+            }
+            for (x, char) in line.chars().enumerate() {
+                texels[cursor_y + y][cursor_x + x] = char;
+            }
+        }
+
+        metadata.push((
+            texcoord,
+            path.file_stem().unwrap().to_str().unwrap().to_string(),
+        ));
+
+        cursor_x += atlas_size;
+    }
+
+    let mut atlas_out = BufWriter::new(File::create(atlas_out).unwrap());
+    let mut atlas_meta_out = BufWriter::new(File::create(atlas_meta_out).unwrap());
+
+    for line in texels {
+        for char in line {
+            write!(atlas_out, "{char}").unwrap()
+        }
+        writeln!(atlas_out).unwrap();
+    }
+
+    for ([x, y], name) in metadata {
+        writeln!(atlas_meta_out, "{x},{y},{name}").unwrap();
+    }
+}