Vertex Loading

Added the ability to load vertex data from the WAD. Still needs
some processing to make more robust, but for now is loading data.

src/lib.rs

@@ -2,6 +2,7 @@
 mod tests;
 
 mod lumps;
+mod types;
 mod utils;
 mod wad;
 

src/lumps/lump.rs

@@ -0,0 +1,13 @@
+#[derive(Clone)]
+pub struct Lump {
+    pub name: String,
+    pub lump_type: LumpType,
+    pub offset: u32,
+    pub size: u32,
+}
+
+#[derive(Clone, Copy)]
+pub enum LumpType {
+    Unknown,
+    Vertex,
+}

src/lumps/mod.rs

@@ -0,0 +1,6 @@
+mod lump;
+mod vertex;
+
+pub use lump::Lump;
+pub use lump::LumpType;
+pub use vertex::VertexLump;

src/lumps/vertex.rs

@@ -0,0 +1,19 @@
+use crate::types::Vertex;
+
+pub struct VertexLump {
+    pub vertexes: Vec<Vertex>,
+}
+
+impl VertexLump {
+    pub fn num_vertexes(&self) -> usize {
+        self.vertexes.len()
+    }
+
+    pub fn get_all_vertexes(&self) -> Vec<Vertex> {
+        self.vertexes.to_vec()
+    }
+
+    pub fn get_vertex(&self, pos: usize) -> Vertex {
+        self.vertexes[pos].to_owned()
+    }
+}

src/tests/wad.rs

@@ -1,36 +1,76 @@
 use crate::WADFile;
 
+use std::sync::OnceLock;
+
+static WAD_INSTANCE: OnceLock<WADFile> = OnceLock::new();
+
+/// Helper function to access the WAD file once
+fn get_wad() -> &'static WADFile {
+    WAD_INSTANCE.get_or_init(|| WADFile::new(String::from("WADs/doom1.wad")))
+}
+
 #[test]
 pub fn successful_wad_id() {
-    let wad_file = WADFile::new(String::from("WADs/doom1.wad"));
+    let wad_file = get_wad();
 
     assert_eq!(wad_file.wad_id, "IWAD");
 }
 
 #[test]
 pub fn correct_lumps() {
-    let wad_file = WADFile::new(String::from("WADs/doom1.wad"));
+    let wad_file = get_wad();
 
     assert_eq!(wad_file.num_lumps, 1264);
 }
 
 #[test]
 pub fn correct_dir_size() {
-    let wad_file = WADFile::new(String::from("WADs/doom1.wad"));
+    let wad_file = get_wad();
 
     assert_eq!(wad_file.directory.len(), 1264);
 }
 
 #[test]
 pub fn correct_lump_name() {
-    let wad_file = WADFile::new(String::from("WADs/doom1.wad"));
+    let wad_file = get_wad();
 
     assert_eq!(wad_file.directory[0].name, "PLAYPAL");
 }
 
 #[test]
 pub fn read_level_lump() {
-    let wad_file = WADFile::new(String::from("WADs/doom1.wad"));
+    let wad_file = get_wad();
 
     assert_eq!(wad_file.directory[6].name, "E1M1");
 }
+
+#[test]
+pub fn read_vertex_lump() {
+    let wad_file = get_wad();
+
+    let vertex_lump = wad_file.get_vertex_lump(wad_file.directory[10].to_owned());
+
+    assert_ne!(vertex_lump.vertexes.len(), 0);
+}
+
+#[test]
+pub fn read_num_vertexes() {
+    let wad_file = get_wad();
+
+    let vertex_lump = wad_file.get_vertex_lump(wad_file.directory[10].to_owned());
+
+    assert_eq!(vertex_lump.vertexes.len(), 1868 / 4);
+}
+
+#[test]
+pub fn read_first_vertex() {
+    use crate::types::Vertex;
+
+    let wad_file = get_wad();
+
+    let vertex_lump = wad_file.get_vertex_lump(wad_file.directory[10].to_owned());
+
+    let correct_vertex = Vertex { x: 1088, y: -3680 };
+
+    assert_eq!(vertex_lump.get_vertex(0), correct_vertex);
+}

src/types/mod.rs

@@ -0,0 +1,3 @@
+mod vertex;
+
+pub use vertex::Vertex;

src/types/vertex.rs

@@ -0,0 +1,5 @@
+#[derive(Clone, Debug, PartialEq)]
+pub struct Vertex {
+    pub x: i16,
+    pub y: i16,
+}

src/utils/helpers.rs

@@ -41,3 +41,11 @@ pub fn read_u32_le(bytes: &[u8]) -> u32 {
         u32::from_le_bytes(bytes[..4].try_into().unwrap())
     }
 }
+
+pub fn read_i16_le(bytes: &[u8]) -> i16 {
+    if bytes.len() < 2 {
+        0
+    } else {
+        i16::from_le_bytes(bytes[..2].try_into().unwrap())
+    }
+}

src/utils/mod.rs

@@ -2,5 +2,6 @@ mod error;
 mod helpers;
 
 pub use helpers::read_ascii;
+pub use helpers::read_i16_le;
 pub use helpers::read_u32_le;
 pub use helpers::validate_wad;

src/wad/directory.rs

@@ -1,5 +0,0 @@
-pub struct Directory {
-    pub filepos: u32,
-    pub size: u32,
-    pub name: String,
-}

src/wad/header.rs

@@ -8,7 +8,7 @@ use crate::utils::{read_ascii, read_u32_le};
 
 impl Header {
     pub fn read_data(data: &[u8]) -> Self {
-        let id = read_ascii(&data[..4]);
+        let id = read_ascii(&data[..4]).to_string();
         let lumps = read_u32_le(&data[4..8]);
         let offset = read_u32_le(&data[8..12]);
 

src/wad/mod.rs

@@ -1,4 +1,3 @@
-mod directory;
 mod header;
 mod wadfile;
 

src/wad/wadfile.rs

@@ -1,15 +1,17 @@
 use std::{fs::File, io::Read, path::Path};
 
-use super::{directory::Directory, header::Header};
-use crate::utils::{read_ascii, read_u32_le, validate_wad};
+use super::header::Header;
+use crate::lumps::{Lump, LumpType, VertexLump};
+use crate::types::Vertex;
+use crate::utils::{read_ascii, read_i16_le, read_u32_le, validate_wad};
 
 pub struct WADFile {
     pub path: String,
     pub wad_id: String,
     pub num_lumps: u32,
     pub dir_offset: u32,
-    pub directory: Vec<Directory>,
-    pub wad_data: Vec<u8>,
+    pub directory: Vec<Lump>,
+    pub data: Vec<u8>,
 }
 
 impl WADFile {
@@ -27,17 +29,19 @@ impl WADFile {
 
         let wad_header = Header::read_data(&file_buffer[0..12]);
 
-        let mut wad_dir: Vec<Directory> = Vec::with_capacity(wad_header.num_lumps as usize);
+        let mut lump_dir: Vec<Lump> = Vec::with_capacity(wad_header.num_lumps as usize);
         let offset = wad_header.dir_offset;
 
         for entry in 0..wad_header.num_lumps {
             let startpos = (offset + 16 * entry) as usize;
-            let filepos = read_u32_le(&file_buffer[startpos..startpos + 4]);
+            let lump_offset = read_u32_le(&file_buffer[startpos..startpos + 4]);
             let size = read_u32_le(&file_buffer[startpos + 4..startpos + 8]);
             let name = read_ascii(&file_buffer[startpos + 8..startpos + 16]);
-            wad_dir.push(Directory {
-                filepos,
+            let lump_type = LumpType::Unknown;
+            lump_dir.push(Lump {
                 name,
+                offset: lump_offset,
+                lump_type,
                 size,
             });
         }
@@ -47,8 +51,29 @@ impl WADFile {
             wad_id: wad_header.wad_id,
             num_lumps: wad_header.num_lumps,
             dir_offset: wad_header.dir_offset,
-            directory: wad_dir,
-            wad_data: file_buffer,
+            directory: lump_dir,
+            data: file_buffer,
         }
     }
+
+    pub fn get_vertex_lump(&self, lump: Lump) -> VertexLump {
+        let lump_offset = lump.offset as usize;
+        let lump_size = lump.size as usize;
+        let lump_data = &self.data[lump_offset..lump_offset + lump_size];
+        let lump_entries: usize = lump_size / 4;
+        let mut vertexes: Vec<Vertex> = Vec::with_capacity(lump_size / 4);
+
+        for entry in 0..lump_entries {
+            let startpos = entry * 4;
+            let vertex_x = read_i16_le(&lump_data[startpos..startpos + 2]);
+            let vertex_y = read_i16_le(&lump_data[startpos + 2..startpos + 4]);
+
+            vertexes.push(Vertex {
+                x: vertex_x,
+                y: vertex_y,
+            });
+        }
+
+        VertexLump { vertexes }
+    }
 }