1 files changed, 60 insertions, 0 deletions
diff --git a/src/chunk.hpp b/src/chunk.hpp
new file mode 100644
index 00000000..829ee0d3
--- /dev/null
+++ b/src/chunk.hpp
@@ -0,0 +1,60 @@
+#pragma once
+#include "tile.hpp"
+#include <type_traits>
+#include <array>
+
+namespace Magnum::Examples {
+
+struct chunk final
+{
+    constexpr tile& operator[](local_coords xy) { return tiles[xy.to_index()]; }
+    constexpr const tile& operator[](local_coords xy) const { return tiles[xy.to_index()]; }
+    constexpr tile& operator[](std::size_t i) { return tiles[i]; }
+    constexpr const tile& operator[](std::size_t i) const { return tiles[i]; }
+
+    template<typename F>
+    requires std::invocable<F, tile&, std::size_t, local_coords>
+    constexpr inline void foreach_tile(F&& fun) { foreach_tile_<F, chunk&>(std::forward<F>(fun)); }
+
+    template<typename F>
+    requires std::invocable<F, const tile&, std::size_t, local_coords>
+    constexpr inline void foreach_tile(F&& fun) const { foreach_tile_<F, const chunk&>(std::forward<F>(fun)); }
+
+private:
+    template<typename F, typename Self>
+    constexpr void foreach_tile_(F&& fun);
+
+    std::array<tile, TILE_COUNT> tiles = {};
+};
+
+template<typename F, typename Self>
+constexpr void chunk::foreach_tile_(F&& fun)
+{
+    constexpr auto N = TILE_MAX_DIM;
+    std::size_t k = 0;
+    for (std::size_t j = 0; j < N; j++)
+        for (std::size_t i = 0; i < N; i++, k++)
+            fun(const_cast<Self>(*this).tiles[k], k,
+                local_coords{(std::uint8_t)i, (std::uint8_t)j});
+}
+
+#if 0
+struct chunk_coords final {
+    std::int16_t x = 0, y = 0;
+    constexpr std::size_t to_index() const noexcept;
+
+    static constexpr std::size_t max_bits = sizeof(chunk_coords::x)*8 * 3 / 4;
+    static_assert(max_bits*4/3/8 == sizeof(decltype(chunk_coords::x)));
+};
+#endif
+
+#if 0
+struct global_coords final {
+    std::uint32_t x = 0, y = 0;
+    constexpr global_coords() noexcept = default;
+    constexpr global_coords(decltype(x) x, decltype(y) y) noexcept : x{x}, y{y} {}
+    constexpr global_coords(chunk_coords c, local_coords tile) noexcept;
+};
+#endif
+
+} // namespace Magnum::Examples