From cd5f05daf5d5df14accb864cb2fb792718788f93 Mon Sep 17 00:00:00 2001
From: Wesley Irvin <wesley@batesirvintech.net>
Date: Fri, 28 Apr 2023 18:26:14 -0400
Subject: [PATCH] Vertex Loading

Added the ability to load vertex data from the vertexes lump for
a given level. This is to close issue #5 to get vertex data
loading working.
---
 src/doomlevel.rs        | 65 +++++++++++++++++++++++++++++++++++++++++
 src/doomlevel/vertex.rs |  4 +++
 src/main.rs             | 15 +++++++---
 3 files changed, 80 insertions(+), 4 deletions(-)
 create mode 100644 src/doomlevel.rs
 create mode 100644 src/doomlevel/vertex.rs

diff --git a/src/doomlevel.rs b/src/doomlevel.rs
new file mode 100644
index 0000000..0c59a08
--- /dev/null
+++ b/src/doomlevel.rs
@@ -0,0 +1,65 @@
+mod vertex;
+
+use std::{
+    fs::File,
+    io::{Read, Seek, SeekFrom},
+};
+
+use super::wadfile::WADFile;
+use vertex::Vertex;
+
+enum Lumps {
+    THINGS = 1,
+    LINEDEFS,
+    SIDEDEFS,
+    VERTEXES,
+    SEGS,
+    SSECTORS,
+    NODES,
+    SECTORS,
+    REJECT,
+    BLOCKMAP,
+    BEHAVIOR,
+}
+
+pub struct DoomLevel {
+    pub name: String,
+    pub vertexes: Vec<Vertex>,
+}
+
+impl DoomLevel {
+    pub fn load_level(wad_file: &WADFile, lvl_index: u32) -> Self {
+        Self {
+            name: wad_file.get_lump_name(lvl_index),
+            vertexes: load_vertexes(
+                wad_file,
+                wad_file.get_lump_offset(lvl_index + Lumps::VERTEXES as u32),
+                wad_file.get_lump_size(lvl_index + Lumps::VERTEXES as u32),
+            ),
+        }
+    }
+}
+
+fn load_vertexes(wad_file: &WADFile, offset: u32, size: u32) -> Vec<Vertex> {
+    let num_vertex: u32 = size / 4u32;
+
+    let mut vertex_list: Vec<Vertex> = Vec::with_capacity(num_vertex as usize);
+
+    let mut vertex_data = File::open(&wad_file.wad_path).unwrap();
+    vertex_data.seek(SeekFrom::Start(offset as u64)).unwrap();
+
+    for _ in 0..num_vertex {
+        let mut x = [0; 2];
+        let mut y = [0; 2];
+
+        vertex_data.read(&mut x).unwrap();
+        vertex_data.read(&mut y).unwrap();
+
+        vertex_list.push(Vertex {
+            x: i16::from_le_bytes(x),
+            y: i16::from_le_bytes(y),
+        });
+    }
+
+    vertex_list
+}
diff --git a/src/doomlevel/vertex.rs b/src/doomlevel/vertex.rs
new file mode 100644
index 0000000..f266719
--- /dev/null
+++ b/src/doomlevel/vertex.rs
@@ -0,0 +1,4 @@
+pub struct Vertex {
+    pub x: i16,
+    pub y: i16,
+}
diff --git a/src/main.rs b/src/main.rs
index 7335f34..17394f5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,9 +1,12 @@
+mod doomlevel;
 mod wadfile;
 
+use doomlevel::DoomLevel;
 use wadfile::WADFile;
 
 fn main() {
     let wad_file = WADFile::from_path("WADs/doom1.wad");
+    let level = DoomLevel::load_level(&wad_file, wad_file.get_index_from_name("e1m1").unwrap());
 
     println!(
         "WAD Path: {}
@@ -32,8 +35,12 @@ Header:
         );
     }
 
-    println!(
-        "Index of e1m1 is: {}",
-        wad_file.get_index_from_name("e1m1").unwrap()
-    );
+    println!("\nFirst 20 Vertex Entries for E1M1:");
+
+    for i in 0..20 {
+        println!(
+            "\t{} - ({}, {})",
+            i, level.vertexes[i].x, level.vertexes[i].y
+        );
+    }
 }