1 files changed, 42 insertions, 0 deletions
diff --git a/src/global-coords.hpp b/src/global-coords.hpp
new file mode 100644
index 00000000..e51dc6aa
--- /dev/null
+++ b/src/global-coords.hpp
@@ -0,0 +1,42 @@
+#pragma once
+#include "local-coords.hpp"
+#include "compat/assert.hpp"
+
+namespace floormat {
+
+struct chunk_coords final {
+    std::int16_t x = 0, y = 0;
+
+    constexpr bool operator==(const chunk_coords& other) const noexcept = default;
+};
+
+struct global_coords final {
+    std::uint32_t x = 0, y = 0;
+
+    constexpr global_coords(chunk_coords c, local_coords xy) :
+        x{ std::uint32_t(c.x + (1 << 15)) << 4 | (xy.x & 0x0f) },
+        y{ std::uint32_t(c.y + (1 << 15)) << 4 | (xy.y & 0x0f) }
+    {}
+    constexpr global_coords(std::uint32_t x, std::uint32_t y) noexcept : x{x}, y{y} {}
+    constexpr global_coords() noexcept = default;
+
+    constexpr local_coords local() const noexcept;
+    constexpr chunk_coords chunk() const noexcept;
+
+    constexpr bool operator==(const global_coords& other) const noexcept = default;
+};
+
+constexpr local_coords global_coords::local() const noexcept
+{
+    return { (std::uint8_t)(x % TILE_MAX_DIM), (std::uint8_t)(y % TILE_MAX_DIM) };
+}
+
+constexpr chunk_coords global_coords::chunk() const noexcept
+{
+    return {
+        (std::int16_t)(std::int32_t(x >> 4) - (1 << 15)),
+        (std::int16_t)(std::int32_t(y >> 4) - (1 << 15)),
+    };
+}
+
+} // namespace floormat