From d509a2cc2f291a6511afdb93cff25f0d58fad71a Mon Sep 17 00:00:00 2001
From: Fabien Freling <public@ffreling.com>
Date: Tue, 8 Oct 2024 13:25:52 +0200
Subject: [PATCH 1/2] add flake

---
 flake.lock | 25 +++++++++++++++++++++++++
 flake.nix  | 17 +++++++++++++++++
 2 files changed, 42 insertions(+)
 create mode 100644 flake.lock
 create mode 100644 flake.nix

diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..f721b97
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,25 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1728279793,
+        "narHash": "sha256-W3D5YpNrUVTFPVU4jiEiboaaUDShaiH5fRl9aJLqUnU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f85a2d005e83542784a755ca8da112f4f65c4aa4",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..4272953
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,17 @@
+{
+  description = "Cartridges";
+
+  outputs = { self, nixpkgs }:
+    let pkgs = nixpkgs.legacyPackages.x86_64-linux;
+    in {
+      devShell.x86_64-linux = with pkgs;
+        mkShell {
+          buildInputs = [
+            just
+            lua-language-server
+          ];
+        };
+
+      formatter.x86_64-linux = pkgs.nixfmt;
+    };
+}

From 834b40e9327899556b4d003e3d3dc671988fe62c Mon Sep 17 00:00:00 2001
From: Fabien Freling <public@ffreling.com>
Date: Tue, 8 Oct 2024 14:02:03 +0200
Subject: [PATCH 2/2] wofl: compute angle

---
 picotron/wolfenstein_src/main.lua | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/picotron/wolfenstein_src/main.lua b/picotron/wolfenstein_src/main.lua
index 31a8f05..bb62e23 100644
--- a/picotron/wolfenstein_src/main.lua
+++ b/picotron/wolfenstein_src/main.lua
@@ -1,6 +1,9 @@
 player = {
-	x = nil,
-	y = nil
+	origin = {
+		x= nil,
+		y = nil
+	},
+	dir = nil
 }
 
 col_bg = 1
@@ -10,18 +13,29 @@ function _init()
 	for i=0,31 do
 		for j=0,31 do
 			if mget(i,j) == 5 then -- player id
-				player.x = i
-				player.y = j
+				player.origin.x = i + 0.5
+				player.origin.y = j + 0.5
+				player.dir = math.pi / 2
 				break
 			end
 		end
 		if (player.x) break
 	end
-	print("player: ("..player.x..", "..player.y..")")
+	print("player: ("..player.origin.x..", "..player.origin.y..")")
+end
+
+function cast_ray(origin, angle)
+	
 end
 
 function _draw()
 	cls(col_bg)
 	rectfill(0, 135, 480, 270, col_ground)
+	local fov = 120 -- horizontal
+	local angle_step=(fov / 480) / 360 * math.pi
+	for x=0,480-1 do
+		local angle = (player.dir-(fov/2) + x * angle_step) % (2 * math.pi)
+		local bloc, dist = cast_ray(player.origin, angle)
+	end
 	-- map()
 end