src: add collision iterator adapter

1 files changed, 66 insertions, 0 deletions

diff --git a/src/collision.hpp b/src/collision.hpp
new file mode 100644
index 00000000..adfec6b0
--- /dev/null
+++ b/src/collision.hpp
@@ -0,0 +1,66 @@
+#pragma once
+#include "compat/LooseQuadtree-impl.h"
+#include "src/pass-mode.hpp"
+#include <cinttypes>
+
+namespace floormat {
+
+struct collision_bbox final
+{
+    using BB = loose_quadtree::BoundingBox<std::int16_t>;
+
+    std::int16_t left, top;
+    std::uint16_t width, height;
+    enum pass_mode pass_mode;
+
+    constexpr collision_bbox();
+    constexpr collision_bbox(std::int16_t left, std::int16_t top, std::uint16_t width, std::uint16_t height, enum pass_mode p) noexcept;
+    operator BB() const noexcept;
+    bool intersects(BB bb) const noexcept;
+    bool intersects(collision_bbox bb) const noexcept;
+};
+
+constexpr collision_bbox::collision_bbox() :
+    left{0}, top{0}, width{0}, height{0}, pass_mode{pass_mode::pass}
+{}
+
+constexpr collision_bbox::collision_bbox(std::int16_t left, std::int16_t top, std::uint16_t width, std::uint16_t height, enum pass_mode p) noexcept :
+    left{left}, top{top}, width{width}, height{height}, pass_mode{p}
+{}
+
+struct collision_bb_extractor final
+{
+    using BB = loose_quadtree::BoundingBox<std::int16_t>;
+    static void ExtractBoundingBox(const collision_bbox* object, BB* bbox);
+};
+
+struct collision_iterator final
+{
+    using Query = typename loose_quadtree::LooseQuadtree<std::int16_t, collision_bbox, collision_bb_extractor>::Query;
+
+    explicit collision_iterator() noexcept;
+    explicit collision_iterator(Query* q) noexcept;
+    ~collision_iterator() noexcept;
+    collision_iterator& operator++() noexcept;
+    const collision_bbox* operator++(int) noexcept;
+    const collision_bbox& operator*() const noexcept;
+    const collision_bbox* operator->() const noexcept;
+    bool operator==(const collision_iterator& other) const noexcept;
+    operator bool() const noexcept;
+
+private:
+    Query* q;
+};
+
+struct collision_query
+{
+    using Query = typename loose_quadtree::LooseQuadtree<std::int16_t, collision_bbox, collision_bb_extractor>::Query;
+    collision_query(Query&& q) noexcept;
+    collision_iterator begin() noexcept;
+    static collision_iterator end() noexcept;
+
+private:
+    Query q;
+};
+
+} // namespace floormat