SIMD noise (not used yet)

src/Game.zig

@@ -616,6 +616,7 @@ pub fn init(allocator: std.mem.Allocator, engine: *Engine, swapchain: *Swapchain
 
     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| {
@@ -636,26 +637,30 @@ pub fn init(allocator: std.mem.Allocator, engine: *Engine, swapchain: *Swapchain
         var it2 = Interator3(usize).init(0, 0, 0, 15, 15, 0);
         while (it2.next()) |pos| {
             const x, const y, _ = pos;
-            const fpos = Vector3.init(
+            const fpos = Vector2.init(
                 @floatFromInt(pos[0]),
                 @floatFromInt(pos[1]),
-                @floatFromInt(pos[2]),
-            ).add(origin);
+            ).add(origin.asVector2());
 
-            const noise = std.math.clamp(math.noise2(fpos.asVector2().divScalar(30)), -1, 1);
-            const fheight = (0.5 * noise + 0.5) * 4 + 1;
-            const iheight: u32 = @intFromFloat(@round(fheight));
+            const iheight = worldHeightI(fpos);
 
             chunk.blocks[0][y][x] = block_bedrock;
-            var i: u32 = 0;
+            var i: i32 = 0;
             while (i < iheight) : (i += 1) {
                 const iz = i + 1;
-                const block = if (i + 1 == iheight) block_grass else block_dirt;
-                chunk.blocks[iz][y][x] = block;
+                const block = if (i + 1 == iheight)
+                    block_grass
+                else if (i + 4 >= iheight)
+                    block_dirt
+                else
+                    block_stone;
+                chunk.blocks[@intCast(iz)][y][x] = block;
             }
         }
     }
 
+    const camera_position = Vector3.init(0, 0, @as(f32, @floatFromInt(worldHeightI(.zero))) + 0.5 + 1.62);
+
     var chunk_it = chunks.iterator();
     while (chunk_it.next()) |entry| {
         const x, const y, const z = entry.key_ptr.*;
@@ -713,6 +718,8 @@ pub fn init(allocator: std.mem.Allocator, engine: *Engine, swapchain: *Swapchain
         .materials = materials,
         .textures = textures,
         .chunks = chunks,
+
+        .camera_position = camera_position,
     };
 }
 
@@ -989,3 +996,19 @@ fn recreateSwapchain(self: *Game) !void {
         self.engine.setObjectName(semaphore.*, "S Transfer[{d}]", .{i});
     }
 }
+
+fn worldHeightF(pos: Vector2) f32 {
+    const noise_hscale = 80;
+
+    const noise_zcenter = 8;
+    const noise_zscale = 5;
+
+    const noise = math.noise2(pos.divScalar(noise_hscale));
+    const height = noise_zscale * noise + noise_zcenter;
+    return height;
+}
+
+fn worldHeightI(pos: Vector2) i32 {
+    const iheight = worldHeightF(pos);
+    return @intFromFloat(@round(iheight));
+}