Level loading functionnal.

gen_sample.lua

@@ -0,0 +1,11 @@
+#!/usr/bin/lua
+local out = io.open("sample.kble", "wb")
+out:write(string.char(
+    2,
+    0, 2,
+    0, 2,
+    0, 1,
+    0, 0,
+    0, 0,
+    1, 1))
+out:close()

src/level.zig

@@ -52,12 +52,7 @@ pub fn init(allocator: *std.mem.Allocator, width: u16, height: u16) !Self {
 /// Load level content from given absolute path. Expect the KBLE file format (see
 /// `kbleformat.md` for more details.
 pub fn init_load(allocator: *std.mem.Allocator, kble_file_path: []const u8) !Self {
-    var self = Self{
-        .width = undefined,
-        .height = undefined,
-        .content = undefined,
-        .selection = undefined,
-    };
+    var self: Self = undefined;
 
     const expected_bytes_per_cell = @sizeOf(cell_type);
 
@@ -74,10 +69,48 @@ pub fn init_load(allocator: *std.mem.Allocator, kble_file_path: []const u8) !Sel
 
     // Read first byte and check than the value matches the size of cell_type.
     {
-        const cell_spec_byte = try(reader.readByte());
+        const cell_spec_byte = try reader.readByte();
         assert(cell_spec_byte == expected_bytes_per_cell);
     }
 
+    // Read four bytes and use them for width and height. Two bytes each.
+    {
+        const width_byte1: u8 = try reader.readByte();
+        const width_byte2: u8 = try reader.readByte();
+        const height_byte1: u8 = try reader.readByte();
+        const height_byte2: u8 = try reader.readByte();
+
+        const width: u16 = @intCast(u16, width_byte1) * 256 + @intCast(u16, width_byte2);
+        const height: u16 = @intCast(u16, height_byte1) * 256 + @intCast(u16, height_byte2);
+
+        std.log.info("Cell size: {}\nWidth/height: {}·{} ; {}·{} => {} ; {}", .{
+            expected_bytes_per_cell,
+            width_byte1,
+            width_byte2,
+            height_byte1,
+            height_byte2,
+            width,
+            height,
+        });
+
+        // Non-null width and height.
+        assert(width > 0);
+        assert(height > 0);
+
+        self = try Self.init(allocator, width, height);
+    }
+
+    // Read the rest of the file and assign to .content accordingly.
+    {
+        var i: u32 = 0;
+        while (i < self.width * self.height) : (i += 1) {
+            const byte1 = try reader.readByte();
+            const byte2 = try reader.readByte();
+            const cell = @intCast(u16, byte1) * 256 + @intCast(u16, byte2);
+            self.content[i] = cell;
+        }
+    }
+
     return self;
 }
 
@@ -234,5 +267,5 @@ test "load level from existing file" {
     const allocator = &arena.allocator;
 
     var level: Self = try Self.init_load(allocator, "sample.kble");
-    //defer level.deinit(allocator);
+    defer level.deinit(allocator);
 }

src/main.zig

@@ -41,7 +41,8 @@ pub fn main() void {
     ray.SetTargetFPS(60);
 
     // Create level.
-    var level: Level = Level.init(allocator, 16, 16) catch unreachable;
+    //var level: Level = Level.init(allocator, 16, 16) catch unreachable;
+    var level: Level = Level.init_load(allocator, "sample.kble") catch unreachable;
     defer level.deinit(allocator);
 
     // Create camera.