1 files changed, 53 insertions, 0 deletions
diff --git a/src/shared/math.hh b/src/shared/math.hh
new file mode 100644
index 0000000..5f03ab4
--- /dev/null
+++ b/src/shared/math.hh
@@ -0,0 +1,53 @@
+#ifndef SHARED_MATH_HH_
+#define SHARED_MATH_HH_
+
+#include <compare>
+
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+namespace shared {
+namespace math {
+
+// 2D coordinates.
+struct coords {
+    std::int32_t x;
+    std::int32_t z;
+    coords operator+(const coords& c) const noexcept {
+        auto ret = *this;
+        ret.x += c.x;
+        ret.z += c.z;
+        return ret;
+    }
+    coords operator-(const coords& c) const noexcept {
+        auto ret = *this;
+        ret.x -= c.x;
+        ret.z -= c.z;
+        return ret;
+    }
+    auto operator<=>(const coords& c) const noexcept = default;
+};
+
+struct angles {
+    float pitch;
+    float yaw;
+    angles operator+(const angles& a) const noexcept {
+        auto ret = *this;
+        ret.pitch += a.pitch;
+        ret.yaw += a.yaw;
+        return ret;
+    }
+};
+
+// Returns a vector pointing in the direction of pitch + yaw.
+glm::vec3 angle_to_dir(const angles& ang) noexcept;
+
+bool is_inside_draw(const shared::math::coords& a,
+                    const shared::math::coords& b,
+                    const std::int32_t draw_distance) noexcept;
+
+} // namespace math
+} // namespace shared
+
+#endif