From 4d61b14052049552472d205ee42fd261054ccc6a Mon Sep 17 00:00:00 2001
From: Szymon Nowakowski <renati@renati.me>
Date: Sun, 30 Nov 2025 14:33:01 +0100
Subject: [PATCH] Interator2

---
 src/Game.zig            | 33 +++++++++++++++++++--------------
 src/math.zig            |  1 +
 src/math/Interator2.zig | 38 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 58 insertions(+), 14 deletions(-)
 create mode 100644 src/math/Interator2.zig

diff --git a/src/Game.zig b/src/Game.zig
index 34c55ca..edfb88d 100644
--- a/src/Game.zig
+++ b/src/Game.zig
@@ -15,7 +15,7 @@ const Engine = @import("engine/Engine.zig");
 const GenericBuffer = @import("engine/GenericBuffer.zig").GenericBuffer;
 const StagingBuffer = @import("engine/StagingBuffer.zig");
 const Swapchain = @import("engine/Swapchain.zig");
-const Interator3 = math.Interator3;
+const Interator2 = math.Interator2;
 const Matrix4x4 = math.Matrix4x4;
 const Quaternion = math.Quaternion;
 const Vector2 = math.Vector2;
@@ -612,31 +612,36 @@ pub fn init(allocator: std.mem.Allocator, engine: *Engine, swapchain: *Swapchain
         chunks.deinit(allocator);
     }
 
-    var it = Interator3(i16).init(-10, -10, 0, 9, 9, 0);
+    var it = Interator2(i16).init(-10, -10, 9, 9);
 
     const block_grass = blocks.getFilename("Grass.json").?;
     const block_dirt = blocks.getFilename("Dirt.json").?;
     const block_stone = blocks.getFilename("Stone.json").?;
     const block_bedrock = blocks.getFilename("Bedrock.json").?;
 
-    while (it.next()) |chunk_coords| {
+    while (it.next()) |chunk_coords2| {
+        const chunk_coords3 = chunk_coords2 ++ [_]i16{0};
+
         const origin = Vector3.init(
-            @floatFromInt(chunk_coords[0]),
-            @floatFromInt(chunk_coords[1]),
-            @floatFromInt(chunk_coords[2]),
+            @floatFromInt(chunk_coords3[0]),
+            @floatFromInt(chunk_coords3[1]),
+            @floatFromInt(chunk_coords3[2]),
         ).mulScalar(16);
 
         try chunks.ensureUnusedCapacity(allocator, 1);
-        chunks.putAssumeCapacityNoClobber(chunk_coords, try Chunk.init(engine, .{
-            .origin = origin,
-            .descriptor_pool = descriptor_pool,
-            .per_batch_descriptor_set_layout = per_batch_descriptor_set_layout,
-        }));
-        const chunk = chunks.getPtr(chunk_coords).?;
+        chunks.putAssumeCapacityNoClobber(
+            chunk_coords3,
+            try Chunk.init(engine, .{
+                .origin = origin,
+                .descriptor_pool = descriptor_pool,
+                .per_batch_descriptor_set_layout = per_batch_descriptor_set_layout,
+            }),
+        );
+        const chunk = chunks.getPtr(chunk_coords3).?;
 
-        var it2 = Interator3(usize).init(0, 0, 0, 15, 15, 0);
+        var it2 = Interator2(usize).init(0, 0, 15, 15);
         while (it2.next()) |pos| {
-            const x, const y, _ = pos;
+            const x, const y = pos;
             const fpos = Vector2.init(
                 @floatFromInt(pos[0]),
                 @floatFromInt(pos[1]),
diff --git a/src/math.zig b/src/math.zig
index cbf20f0..fb77496 100644
--- a/src/math.zig
+++ b/src/math.zig
@@ -1,3 +1,4 @@
+pub const Interator2 = @import("math/Interator2.zig").Interator2;
 pub const Interator3 = @import("math/Interator3.zig").Interator3;
 pub const Iterator3 = @import("math/Iterator3.zig");
 pub const Matrix4x4 = @import("math/Matrix4x4.zig").Matrix4x4;
diff --git a/src/math/Interator2.zig b/src/math/Interator2.zig
new file mode 100644
index 0000000..0031bf4
--- /dev/null
+++ b/src/math/Interator2.zig
@@ -0,0 +1,38 @@
+pub fn Interator2(comptime T: type) type {
+    return struct {
+        const Self = @This();
+        const Vector = @Vector(2, T);
+
+        min: Vector,
+        max: Vector,
+        current: ?Vector,
+
+        pub fn init(min_x: T, min_y: T, max_x: T, max_y: T) Self {
+            const min: Vector = .{ min_x, min_y };
+            const max: Vector = .{ max_x, max_y };
+            return .{
+                .min = min,
+                .max = max,
+                .current = min,
+            };
+        }
+
+        pub fn next(self: *Self) ?[2]T {
+            const current = self.current orelse return null;
+            var next_current = current;
+
+            next_current[0] = next_current[0] + 1;
+            if (next_current[0] > self.max[0]) {
+                next_current[0] = self.min[0];
+                next_current[1] = next_current[1] + 1;
+                if (next_current[1] > self.max[1]) {
+                    self.current = null;
+                    return current;
+                }
+            }
+
+            self.current = next_current;
+            return current;
+        }
+    };
+}