Add include guards and header comments to sources

7 files changed, 59 insertions, 4 deletions

diff --git a/src/core/math/aabb.hh b/src/core/math/aabb.hh
index f3eb7bd..79f814a 100644
--- a/src/core/math/aabb.hh
+++ b/src/core/math/aabb.hh
@@ -1,3 +1,10 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2025 Kirill Dmitrievich
+// File: aabb.hh
+// Description: Axis-aligned bounding box
+
+#ifndef CORE_MATH_AABB_HH
+#define CORE_MATH_AABB_HH
 #pragma once
 
 #include "core/math/concepts.hh"
@@ -109,3 +116,5 @@ constexpr math::AABB<T> math::AABB<T>::push(const vector_type& vector) const
     result.max = max + vector;
     return result;
 }
+
+#endif
diff --git a/src/core/math/angles.hh b/src/core/math/angles.hh
index 174f320..b339323 100644
--- a/src/core/math/angles.hh
+++ b/src/core/math/angles.hh
@@ -1,3 +1,10 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2025 Kirill Dmitrievich
+// File: angles.hh
+// Description: Angle utilities
+
+#ifndef CORE_MATH_ANGLES_HH
+#define CORE_MATH_ANGLES_HH
 #pragma once
 
 #include "core/math/constexpr.hh"
@@ -101,3 +108,5 @@ inline void math::vectors(const glm::fvec3& angles, glm::fvec3* forward, glm::fv
         up->z = nsv.x * ncv.y * pcv.z + psv.y * psv.z;
     }
 }
+
+#endif
diff --git a/src/core/math/concepts.hh b/src/core/math/concepts.hh
index 6ad5cb7..5d1ef7d 100644
--- a/src/core/math/concepts.hh
+++ b/src/core/math/concepts.hh
@@ -1,3 +1,10 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2025 Kirill Dmitrievich
+// File: concepts.hh
+// Description: C++20 concepts that should be in standard library but are not
+
+#ifndef CORE_MATH_CONCEPTS_HH
+#define CORE_MATH_CONCEPTS_HH
 #pragma once
 
 namespace math
@@ -9,3 +16,5 @@ concept signed_arithmetic = std::is_arithmetic_v<type> && std::is_signed_v<type>
 template<typename type>
 concept unsigned_arithmetic = std::is_arithmetic_v<type> && std::is_unsigned_v<type>;
 } // namespace math
+
+#endif
diff --git a/src/core/math/constexpr.hh b/src/core/math/constexpr.hh
index 4158803..7aba4d2 100644
--- a/src/core/math/constexpr.hh
+++ b/src/core/math/constexpr.hh
@@ -1,3 +1,10 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2025 Kirill Dmitrievich
+// File: constexpr.hh
+// Description: Compile-time expressions
+
+#ifndef CORE_MATH_CONSTEXPR_HH
+#define CORE_MATH_CONSTEXPR_HH
 #pragma once
 
 #include "core/math/concepts.hh"
@@ -70,3 +77,5 @@ constexpr scalar math::radians(const scalar x)
 {
     return static_cast<scalar>(static_cast<double>(x) * M_PI / 180.0);
 }
+
+#endif
diff --git a/src/core/math/crc64.cc b/src/core/math/crc64.cc
index 99a4b20..ce1e1db 100644
--- a/src/core/math/crc64.cc
+++ b/src/core/math/crc64.cc
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2025 Kirill Dmitrievich
+// File: crc64.cc
+// Description: Client-server synchronized CRC64
+
 #include "core/pch.hh"
 
 #include "core/math/crc64.hh"
diff --git a/src/core/math/crc64.hh b/src/core/math/crc64.hh
index 3ece0df..f593dc9 100644
--- a/src/core/math/crc64.hh
+++ b/src/core/math/crc64.hh
@@ -1,3 +1,10 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2025 Kirill Dmitrievich
+// File: crc64.hh
+// Description: Client-server synchronized CRC64
+
+#ifndef CORE_MATH_CRC64_HH
+#define CORE_MATH_CRC64_HH
 #pragma once
 
 namespace math
@@ -7,3 +14,5 @@ std::uint64_t crc64(const std::vector<std::byte>& buffer, std::uint64_t combine
 std::uint64_t crc64(const std::string& buffer, std::uint64_t combine = UINT64_C(0));
 std::uint64_t crc64(std::string_view buffer, std::uint64_t combine = UINT64_C(0));
 } // namespace math
+
+#endif
diff --git a/src/core/math/vectors.hh b/src/core/math/vectors.hh
index bc11dd0..2934bb6 100644
--- a/src/core/math/vectors.hh
+++ b/src/core/math/vectors.hh
@@ -1,11 +1,14 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2025 Kirill Dmitrievich
+// File: vectors.hh
+// Description: because NO ONE would POSSIBLY need integer-based distance calculations in a VOXEL game
+
+#ifndef CORE_MATH_VECTORS_HH
+#define CORE_MATH_VECTORS_HH
 #pragma once
 
 #include "core/math/concepts.hh"
 
-// core/vectors.hh - because NO ONE would POSSIBLY
-// need integer-based distance calculations in a
-// game about voxels. That would be INSANE! :D
-
 namespace math
 {
 template<math::arithmetic T>
@@ -41,3 +44,5 @@ constexpr static inline const T math::distance2(const glm::vec<3, T>& vector_a,
 {
     return math::length2(vector_a - vector_b);
 }
+
+#endif