From 0b61e416395630e4e46c2a129dec83ca6ebe61ff Mon Sep 17 00:00:00 2001
From: Louis Hollingworth <louis@hollingworth.nl>
Date: Sat, 8 Jul 2023 19:37:47 +0100
Subject: [PATCH] Finally got a grid loaded on the screen.

Signed-off-by: Louis Hollingworth <louis@hollingworth.nl>
---
 README.md        |  5 ++-
 Rust.gdextension | 13 ++++++++
 project.godot    |  1 +
 rust/Cargo.toml  | 11 +++++++
 rust/src/lib.rs  | 81 ++++++++++++++++++++++++++++++++++++++++++++++++
 scenes/main.tscn |  5 +++
 6 files changed, 115 insertions(+), 1 deletion(-)
 create mode 100644 Rust.gdextension
 create mode 100644 rust/Cargo.toml
 create mode 100755 rust/src/lib.rs
 create mode 100644 scenes/main.tscn

diff --git a/README.md b/README.md
index 6e5f9e6..cbf1600 100644
--- a/README.md
+++ b/README.md
@@ -4,4 +4,7 @@
 </a>
 </div>
 
-Just a project for me to learn Godot.
+Just a project for me to learn Godot 4 with Rust. I'm following a [YouTube Tutorial](https://www.youtube.com/playlist?list=PLM-hFhoXjVl1hq0j9lxgRCzxkBpDZhDlT)
+to make this game.
+The video covers using GDScript, which is a bit too much like python for me,
+so I'm converting the code to Rust as I follow along
diff --git a/Rust.gdextension b/Rust.gdextension
new file mode 100644
index 0000000..475e090
--- /dev/null
+++ b/Rust.gdextension
@@ -0,0 +1,13 @@
+[configuration]
+entry_symbol = "gdext_rust_init"
+compatibility_minimum = 4.1
+
+[libraries]
+linux.debug.x86_64 = "res://rust/target/debug/libkolonio.so"
+linux.release.x86_64 = "res://rust/target/release/libkolonio.so"
+windows.debug.x86_64 = "res://rust/target/debug/kolonio.dll"
+windows.release.x86_64 = "res://rust/target/release/kolonio.dll"
+macos.debug = "res://rust/target/debug/libkolonio.dylib"
+macos.release = "res://rust/target/release/libkolonio.dylib"
+macos.debug.arm64 = "res://rust/target/debug/libkolonio.dylib"
+macos.release.arm64 = "res://rust/target/release/libkolonio.dylib"
diff --git a/project.godot b/project.godot
index 847b2b0..f8212a1 100644
--- a/project.godot
+++ b/project.godot
@@ -11,6 +11,7 @@ config_version=5
 [application]
 
 config/name="Kolonio"
+run/main_scene="res://scenes/main.tscn"
 config/features=PackedStringArray("4.1", "Forward Plus")
 config/icon="res://icon.svg"
 
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
new file mode 100644
index 0000000..6bd4a8c
--- /dev/null
+++ b/rust/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "kolonio"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+godot = { git = "https://github.com/godot-rust/gdext", branch = "master" }
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
new file mode 100755
index 0000000..42691a1
--- /dev/null
+++ b/rust/src/lib.rs
@@ -0,0 +1,81 @@
+use godot::prelude::*;
+
+struct MyExtension;
+
+#[gdextension]
+unsafe impl ExtensionLibrary for MyExtension {}
+
+#[derive(GodotClass)]
+#[class(base=Node2D)]
+pub struct Main {
+    #[base]
+    base: Base<Node2D>,
+}
+
+#[godot_api]
+impl Node2DVirtual for Main {
+    fn init(base: Base<Node2D>) -> Self {
+        Main {
+            base
+        }
+    }
+}
+
+#[derive(GodotClass)]
+#[class(base=Node2D)]
+pub struct WorldGrid {
+    pub width: usize,
+    pub height: usize,
+    pub cell_size: usize,
+    grid: Dictionary,
+    pub debug: bool,
+
+    #[base]
+    base: Base<Node2D>,
+}
+
+#[godot_api]
+impl Node2DVirtual for WorldGrid {
+    fn init(base: Base<Node2D>) -> Self {
+        println!("Init start!");
+        WorldGrid {
+            width: 16,
+            height: 16,
+            cell_size: 128,
+            grid: Dictionary::new(),
+            debug: true,
+            base,
+        }
+    }
+
+    fn ready(&mut self) {
+        self.generate()
+    }
+}
+
+#[godot_api]
+impl WorldGrid {
+    pub fn generate(&mut self) {
+        for x in 0..self.width {
+            for y in 0..self.height{
+                self.grid.insert(Vector2::new(x as f32, y as f32), 0);
+                if self.debug {
+                    let mut rect = godot::engine::ReferenceRect::new_alloc();
+                    rect.set_position(self.grid_to_world(Vector2::new(x as f32, y as f32)));
+                    rect.set_size(Vector2::new(self.cell_size as f32, self.cell_size as f32));
+                    rect.set_editor_only(false);
+                    self.add_child(rect.share().upcast());
+                    let mut label = godot::engine::Label::new_alloc();
+                    label.set_position(self.grid_to_world(Vector2::new(x as f32, y as f32)));
+                    label.set_text(format!("({}, {})", x, y).into());
+                    let label_scene = label.share().upcast();
+                    self.add_child(label_scene)
+                }
+            }
+        }
+    }
+
+    fn grid_to_world(&self, pos: Vector2) -> Vector2 {
+        return Vector2::new(pos.x * (self.cell_size as f32), pos.y * (self.cell_size as f32))
+    }
+}
diff --git a/scenes/main.tscn b/scenes/main.tscn
new file mode 100644
index 0000000..bbe64bd
--- /dev/null
+++ b/scenes/main.tscn
@@ -0,0 +1,5 @@
+[gd_scene format=3 uid="uid://dsjw61aafgqyb"]
+
+[node name="Main" type="Main"]
+
+[node name="WorldGrid" type="WorldGrid" parent="."]