From 00e7c564fd5c72d44a6db887c2faa3e00e2ba8e3 Mon Sep 17 00:00:00 2001
From: Orange <orange-cpp@yandex.ru>
Date: Thu, 11 Jun 2026 16:18:42 +0300
Subject: [PATCH] added gcem

---
 CMakeLists.txt                                | 10 +++++++++
 CMakePresets.json                             |  2 +-
 .../internal/optional_constexpr_math.hpp      | 12 ++++++++++
 include/omath/trigonometry/angle.hpp          | 22 ++++++++++++++++---
 vcpkg.json                                    |  7 ++++++
 5 files changed, 49 insertions(+), 4 deletions(-)
 create mode 100644 include/omath/internal/optional_constexpr_math.hpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fd24fcd..8da5a63 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,6 +33,7 @@ option(OMATH_ENABLE_FORCE_INLINE
 option(OMATH_ENABLE_LUA
         "omath bindings for lua" OFF)
 option(OMATH_ENABLE_HOOKING "omath will HooksManager that can hook DirectX/OpenGL automatically" OFF)
+option(OMATH_USE_GCEM "omath will use gcem library to make more functions/methods constexpr" OFF)
 
 if(VCPKG_MANIFEST_FEATURES)
     foreach(omath_feature IN LISTS VCPKG_MANIFEST_FEATURES)
@@ -50,6 +51,8 @@ if(VCPKG_MANIFEST_FEATURES)
             set(OMATH_ENABLE_LUA ON)
         elseif(omath_feature STREQUAL "hooking")
             set(OMATH_ENABLE_HOOKING ON)
+        elseif (omath_feature STREQUAL "gcem")
+            set(OMATH_USE_GCEM ON)
         endif()
 
     endforeach()
@@ -80,6 +83,7 @@ if(${PROJECT_IS_TOP_LEVEL})
     message(STATUS "[${PROJECT_NAME}]: Coverage feature status ${OMATH_ENABLE_COVERAGE}")
     message(STATUS "[${PROJECT_NAME}]: Valgrind feature status ${OMATH_ENABLE_VALGRIND}")
     message(STATUS "[${PROJECT_NAME}]: Lua feature status ${OMATH_ENABLE_LUA}")
+    message(STATUS "[${PROJECT_NAME}]: Gcem feature status ${OMATH_USE_GCEM}")
 endif()
 
 if(OMATH_STATIC_MSVC_RUNTIME_LIBRARY)
@@ -120,6 +124,12 @@ if (OMATH_ENABLE_HOOKING)
     endif ()
 endif ()
 
+
+if (OMATH_USE_GCEM)
+    target_compile_definitions(${PROJECT_NAME} PUBLIC OMATH_USE_GCEM)
+    find_package(gcem CONFIG REQUIRED)
+    target_link_libraries(${PROJECT_NAME} PUBLIC gcem)
+endif ()
 add_library(${PROJECT_NAME}::${PROJECT_NAME} ALIAS ${PROJECT_NAME})
 
 target_compile_definitions(${PROJECT_NAME} PUBLIC OMATH_VERSION="${PROJECT_VERSION}")
diff --git a/CMakePresets.json b/CMakePresets.json
index 2ed29f2..f067ed3 100644
--- a/CMakePresets.json
+++ b/CMakePresets.json
@@ -57,7 +57,7 @@
       "inherits": ["windows-base", "vcpkg-base"],
       "cacheVariables": {
         "VCPKG_TARGET_TRIPLET": "x64-windows-static",
-        "VCPKG_MANIFEST_FEATURES": "tests;imgui;avx2;examples;hooking",
+        "VCPKG_MANIFEST_FEATURES": "tests;imgui;avx2;examples;hooking;gcem",
         "OMATH_STATIC_MSVC_RUNTIME_LIBRARY": "ON"
       }
     },
diff --git a/include/omath/internal/optional_constexpr_math.hpp b/include/omath/internal/optional_constexpr_math.hpp
new file mode 100644
index 0000000..ecc49dd
--- /dev/null
+++ b/include/omath/internal/optional_constexpr_math.hpp
@@ -0,0 +1,12 @@
+//
+// Created by orange on 6/11/2026.
+//
+#pragma once
+
+
+#ifdef OMATH_USE_GCEM
+#include <gcem.hpp>
+#define OMATH_CONSTEXPR constexpr
+#else
+#define OMATH_CONSTEXPR
+#endif
\ No newline at end of file
diff --git a/include/omath/trigonometry/angle.hpp b/include/omath/trigonometry/angle.hpp
index 4506e0c..7b687ee 100644
--- a/include/omath/trigonometry/angle.hpp
+++ b/include/omath/trigonometry/angle.hpp
@@ -7,6 +7,7 @@
 #include <algorithm>
 #include <format>
 #include <utility>
+#include "omath/internal/optional_constexpr_math.hpp"
 
 namespace omath
 {
@@ -70,21 +71,36 @@ namespace omath
         }
 
         [[nodiscard]]
-        Type sin() const noexcept
+        OMATH_CONSTEXPR Type sin() const noexcept
         {
+#ifdef OMATH_USE_GCEM
+            return gcem::sin(as_radians());
+#else
             return std::sin(as_radians());
+
+#endif
         }
 
         [[nodiscard]]
-        Type cos() const noexcept
+        OMATH_CONSTEXPR Type cos() const noexcept
         {
+#ifdef OMATH_USE_GCEM
+            return gcem::cos(as_radians());
+#else
             return std::cos(as_radians());
+
+#endif
         }
 
         [[nodiscard]]
-        Type tan() const noexcept
+        OMATH_CONSTEXPR Type tan() const noexcept
         {
+#ifdef OMATH_USE_GCEM
+            return gcem::tan(as_radians());
+#else
             return std::tan(as_radians());
+
+#endif
         }
 
         [[nodiscard]]
diff --git a/vcpkg.json b/vcpkg.json
index 27e3bef..5b68917 100644
--- a/vcpkg.json
+++ b/vcpkg.json
@@ -82,6 +82,13 @@
         "lua",
         "sol2"
       ]
+    },
+    "gcem":
+    {
+      "description": "Improve constexpr compatibility using gcem",
+      "dependencies": [
+        "gcem"
+      ]
     }
   }
 }