added opengl for linux

.claude/skills/karpathy-guidelines/SKILL.md

@@ -0,0 +1,67 @@
+---
+name: karpathy-guidelines
+description: Behavioral guidelines to reduce common LLM coding mistakes. Use when writing, reviewing, or refactoring code to avoid overcomplication, make surgical changes, surface assumptions, and define verifiable success criteria.
+license: MIT
+---
+
+# Karpathy Guidelines
+
+Behavioral guidelines to reduce common LLM coding mistakes, derived from [Andrej Karpathy's observations](https://x.com/karpathy/status/2015883857489522876) on LLM coding pitfalls.
+
+**Tradeoff:** These guidelines bias toward caution over speed. For trivial tasks, use judgment.
+
+## 1. Think Before Coding
+
+**Don't assume. Don't hide confusion. Surface tradeoffs.**
+
+Before implementing:
+- State your assumptions explicitly. If uncertain, ask.
+- If multiple interpretations exist, present them - don't pick silently.
+- If a simpler approach exists, say so. Push back when warranted.
+- If something is unclear, stop. Name what's confusing. Ask.
+
+## 2. Simplicity First
+
+**Minimum code that solves the problem. Nothing speculative.**
+
+- No features beyond what was asked.
+- No abstractions for single-use code.
+- No "flexibility" or "configurability" that wasn't requested.
+- No error handling for impossible scenarios.
+- If you write 200 lines and it could be 50, rewrite it.
+
+Ask yourself: "Would a senior engineer say this is overcomplicated?" If yes, simplify.
+
+## 3. Surgical Changes
+
+**Touch only what you must. Clean up only your own mess.**
+
+When editing existing code:
+- Don't "improve" adjacent code, comments, or formatting.
+- Don't refactor things that aren't broken.
+- Match existing style, even if you'd do it differently.
+- If you notice unrelated dead code, mention it - don't delete it.
+
+When your changes create orphans:
+- Remove imports/variables/functions that YOUR changes made unused.
+- Don't remove pre-existing dead code unless asked.
+
+The test: Every changed line should trace directly to the user's request.
+
+## 4. Goal-Driven Execution
+
+**Define success criteria. Loop until verified.**
+
+Transform tasks into verifiable goals:
+- "Add validation" → "Write tests for invalid inputs, then make them pass"
+- "Fix the bug" → "Write a test that reproduces it, then make it pass"
+- "Refactor X" → "Ensure tests pass before and after"
+
+For multi-step tasks, state a brief plan:
+```
+1. [Step] → verify: [check]
+2. [Step] → verify: [check]
+3. [Step] → verify: [check]
+```
+
+Strong success criteria let you loop independently. Weak criteria ("make it work") require constant clarification.

.idea/editor.xml

@@ -139,6 +139,7 @@
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppNotAllPathsReturnValue/@EntryIndexedValue" value="WARNING" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppObjectMemberMightNotBeInitialized/@EntryIndexedValue" value="WARNING" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppOutParameterMustBeWritten/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppOverrideWithDifferentVisibility/@EntryIndexedValue" value="WARNING" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppParameterMayBeConst/@EntryIndexedValue" value="HINT" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppParameterMayBeConstPtrOrRef/@EntryIndexedValue" value="SUGGESTION" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppParameterNamesMismatch/@EntryIndexedValue" value="HINT" type="string" />

.idea/omath.iml

@@ -1,2 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module classpath="CIDR" type="CPP_MODULE" version="4" />

CLAUDE.md

@@ -0,0 +1,65 @@
+# CLAUDE.md
+
+Behavioral guidelines to reduce common LLM coding mistakes. Merge with project-specific instructions as needed.
+
+**Tradeoff:** These guidelines bias toward caution over speed. For trivial tasks, use judgment.
+
+## 1. Think Before Coding
+
+**Don't assume. Don't hide confusion. Surface tradeoffs.**
+
+Before implementing:
+- State your assumptions explicitly. If uncertain, ask.
+- If multiple interpretations exist, present them - don't pick silently.
+- If a simpler approach exists, say so. Push back when warranted.
+- If something is unclear, stop. Name what's confusing. Ask.
+
+## 2. Simplicity First
+
+**Minimum code that solves the problem. Nothing speculative.**
+
+- No features beyond what was asked.
+- No abstractions for single-use code.
+- No "flexibility" or "configurability" that wasn't requested.
+- No error handling for impossible scenarios.
+- If you write 200 lines and it could be 50, rewrite it.
+
+Ask yourself: "Would a senior engineer say this is overcomplicated?" If yes, simplify.
+
+## 3. Surgical Changes
+
+**Touch only what you must. Clean up only your own mess.**
+
+When editing existing code:
+- Don't "improve" adjacent code, comments, or formatting.
+- Don't refactor things that aren't broken.
+- Match existing style, even if you'd do it differently.
+- If you notice unrelated dead code, mention it - don't delete it.
+
+When your changes create orphans:
+- Remove imports/variables/functions that YOUR changes made unused.
+- Don't remove pre-existing dead code unless asked.
+
+The test: Every changed line should trace directly to the user's request.
+
+## 4. Goal-Driven Execution
+
+**Define success criteria. Loop until verified.**
+
+Transform tasks into verifiable goals:
+- "Add validation" → "Write tests for invalid inputs, then make them pass"
+- "Fix the bug" → "Write a test that reproduces it, then make it pass"
+- "Refactor X" → "Ensure tests pass before and after"
+
+For multi-step tasks, state a brief plan:
+```
+1. [Step] → verify: [check]
+2. [Step] → verify: [check]
+3. [Step] → verify: [check]
+```
+
+Strong success criteria let you loop independently. Weak criteria ("make it work") require constant clarification.
+
+---
+
+**These guidelines are working if:** fewer unnecessary changes in diffs, fewer rewrites due to overcomplication, and clarifying questions come before implementation rather than after mistakes.

CMakeLists.txt

@@ -32,7 +32,7 @@ option(OMATH_ENABLE_FORCE_INLINE
        "Will for compiler to make some functions to be force inlined no matter what" ON)
 option(OMATH_ENABLE_LUA
         "omath bindings for lua" OFF)
-option(OMATH_ENABLE_HOOKING "omath will HooksManager that can hook DirectX automatically" OFF)
+option(OMATH_ENABLE_HOOKING "omath will HooksManager that can hook DirectX/OpenGL automatically" OFF)
 
 if(VCPKG_MANIFEST_FEATURES)
     foreach(omath_feature IN LISTS VCPKG_MANIFEST_FEATURES)
@@ -113,7 +113,10 @@ if (OMATH_ENABLE_HOOKING)
     target_link_libraries(${PROJECT_NAME} PRIVATE safetyhook::safetyhook)
 
     if (WIN32)
-        target_link_libraries(${PROJECT_NAME} PRIVATE d3d9 d3d11 d3d12 dxgi)
+        target_link_libraries(${PROJECT_NAME} PRIVATE d3d9 d3d11 d3d12 dxgi opengl32 gdi32)
+    elseif (UNIX AND NOT APPLE)
+        find_package(OpenGL REQUIRED)
+        target_link_libraries(${PROJECT_NAME} PRIVATE OpenGL::GL ${CMAKE_DL_LIBS})
     endif ()
 endif ()
 

examples/CMakeLists.txt

@@ -5,15 +5,16 @@ add_subdirectory(example_signature_scan)
 add_subdirectory(example_hud)
 
 if(OMATH_ENABLE_HOOKING AND WIN32)
-    # Requires imgui with dx9-binding, dx11-binding, dx12-binding, win32-binding.
+    # Requires imgui with dx9-binding, dx11-binding, dx12-binding, opengl3-binding, win32-binding.
-    # Install via: vcpkg install imgui[dx9-binding,dx11-binding,dx12-binding,win32-binding]
+    # Install via: vcpkg install imgui[dx9-binding,dx11-binding,dx12-binding,opengl3-binding,win32-binding]
     find_package(imgui CONFIG QUIET)
     if(imgui_FOUND)
         add_subdirectory(example_dx9_hook)
         add_subdirectory(example_dx11_hook)
         add_subdirectory(example_dx12_hook)
+        add_subdirectory(example_opengl_hook)
     else()
-        message(STATUS "[omath] imgui not found — DX hook examples skipped")
+        message(STATUS "[omath] imgui not found - hook examples skipped")
     endif()
 endif()
 

examples/example_dx11_hook/dllmain.cpp

@@ -1,3 +1,4 @@
+#include "omath/hooks/hooks_manager.hpp"
 #include <Windows.h>
 #include <d3d11.h>
 #include <dxgi.h>
@@ -5,18 +6,16 @@
 #include <imgui_impl_dx11.h>
 #include <imgui_impl_win32.h>
 
-#include "omath/hooks/hooks_manager.hpp"
-
 extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND, UINT, WPARAM, LPARAM);
 
 namespace
 {
-    bool g_initialized    = false;
+    bool g_initialized = false;
     bool g_init_attempted = false;
 
-    ID3D11Device*            g_device             = nullptr;
+    ID3D11Device* g_device = nullptr;
-    ID3D11DeviceContext*     g_context             = nullptr;
+    ID3D11DeviceContext* g_context = nullptr;
-    ID3D11RenderTargetView*  g_render_target_view  = nullptr;
+    ID3D11RenderTargetView* g_render_target_view = nullptr;
 
     void create_render_target(IDXGISwapChain* swap_chain)
     {
@@ -51,12 +50,14 @@ namespace
         ImGui_ImplDX11_Init(g_device, g_context);
 
         auto& mgr = omath::hooks::HooksManager::get();
-        mgr.set_on_wnd_proc([](HWND h, UINT msg, WPARAM wp, LPARAM lp) -> std::optional<LRESULT> {
+        mgr.set_on_wnd_proc(
-            if (ImGui_ImplWin32_WndProcHandler(h, msg, wp, lp))
+                [](HWND h, UINT msg, WPARAM wp, LPARAM lp) -> std::optional<LRESULT>
-                return 0;
+                {
-            return std::nullopt;
+                    if (ImGui_ImplWin32_WndProcHandler(h, msg, wp, lp))
-        });
+                        return 0;
-        mgr.hook_wnd_proc(desc.OutputWindow);
+                    return std::nullopt;
+                });
+        std::ignore = mgr.hook_wnd_proc(desc.OutputWindow);
 
         g_initialized = true;
     }
@@ -105,17 +106,20 @@ BOOL WINAPI DllMain(HINSTANCE h_instance, DWORD reason, LPVOID)
     if (reason == DLL_PROCESS_ATTACH)
     {
         DisableThreadLibraryCalls(h_instance);
-        CreateThread(nullptr, 0, [](LPVOID) -> DWORD
+        CreateThread(
-        {
+                nullptr, 0,
-            while (!GetModuleHandle("d3d11.dll"))
+                [](LPVOID) -> DWORD
-                Sleep(100);
+                {
+                    while (!GetModuleHandle("d3d11.dll"))
+                        Sleep(100);
 
-            auto& mgr = omath::hooks::HooksManager::get();
+                    auto& mgr = omath::hooks::HooksManager::get();
-            mgr.set_on_present(on_present);
+                    mgr.set_on_present(on_present);
-            mgr.set_on_resize_buffers(on_resize_buffers);
+                    mgr.set_on_resize_buffers(on_resize_buffers);
-            mgr.hook_dx11();
+                    mgr.hook_dx11();
-            return 0;
+                    return 0;
-        }, nullptr, 0, nullptr);
+                },
+                nullptr, 0, nullptr);
     }
     else if (reason == DLL_PROCESS_DETACH)
     {
@@ -130,9 +134,21 @@ BOOL WINAPI DllMain(HINSTANCE h_instance, DWORD reason, LPVOID)
             ImGui::DestroyContext();
         }
 
-        if (g_render_target_view) { g_render_target_view->Release(); g_render_target_view = nullptr; }
+        if (g_render_target_view)
-        if (g_context)            { g_context->Release();            g_context            = nullptr; }
+        {
-        if (g_device)             { g_device->Release();             g_device             = nullptr; }
+            g_render_target_view->Release();
+            g_render_target_view = nullptr;
+        }
+        if (g_context)
+        {
+            g_context->Release();
+            g_context = nullptr;
+        }
+        if (g_device)
+        {
+            g_device->Release();
+            g_device = nullptr;
+        }
     }
     return TRUE;
 }

examples/example_opengl_hook/CMakeLists.txt

@@ -0,0 +1,13 @@
+project(example_opengl_hook)
+
+add_library(${PROJECT_NAME} MODULE dllmain.cpp)
+
+set_target_properties(${PROJECT_NAME} PROPERTIES
+    CXX_STANDARD 23
+    MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>"
+    ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_SOURCE_DIR}/out/${CMAKE_BUILD_TYPE}"
+    LIBRARY_OUTPUT_DIRECTORY "${CMAKE_SOURCE_DIR}/out/${CMAKE_BUILD_TYPE}"
+    RUNTIME_OUTPUT_DIRECTORY "${CMAKE_SOURCE_DIR}/out/${CMAKE_BUILD_TYPE}")
+
+find_package(imgui CONFIG REQUIRED)
+target_link_libraries(${PROJECT_NAME} PRIVATE omath::omath imgui::imgui opengl32 gdi32)

examples/example_opengl_hook/dllmain.cpp

@@ -0,0 +1,116 @@
+#include "omath/hooks/hooks_manager.hpp"
+#include <Windows.h>
+#include <chrono>
+#include <imgui.h>
+#include <imgui_impl_opengl3.h>
+#include <imgui_impl_win32.h>
+#include <optional>
+#include <thread>
+
+extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND, UINT, WPARAM, LPARAM);
+
+namespace
+{
+    bool g_initialized = false;
+    bool g_init_attempted = false;
+    bool g_show_menu = true;
+
+    constexpr auto g_module_wait_delay = std::chrono::milliseconds{100};
+
+    void init(HDC hdc)
+    {
+        g_init_attempted = true;
+
+        const HWND hwnd = WindowFromDC(hdc);
+        if (!hwnd)
+            return;
+
+        ImGui::CreateContext();
+        ImGui::StyleColorsDark();
+        ImGui::GetIO().IniFilename = nullptr;
+        ImGui::GetIO().LogFilename = nullptr;
+        ImGui::GetIO().ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange;
+
+        ImGui_ImplWin32_Init(hwnd);
+        ImGui_ImplOpenGL3_Init();
+
+        auto& mgr = omath::hooks::HooksManager::get();
+        mgr.set_on_wnd_proc(
+                [](HWND h, UINT msg, WPARAM wp, LPARAM lp) -> std::optional<LRESULT>
+                {
+                    if (!g_show_menu)
+                        return std::nullopt;
+
+                    if (ImGui_ImplWin32_WndProcHandler(h, msg, wp, lp))
+                        return 0;
+                    return std::nullopt;
+                });
+        (void)mgr.hook_wnd_proc(hwnd);
+
+        g_initialized = true;
+    }
+
+    void on_swap_buffers(HDC hdc)
+    {
+        if (!g_initialized)
+        {
+            if (!g_init_attempted)
+                init(hdc);
+            return;
+        }
+
+        if (GetAsyncKeyState(VK_INSERT) & 1)
+            g_show_menu = !g_show_menu;
+
+        ImGui_ImplOpenGL3_NewFrame();
+        ImGui_ImplWin32_NewFrame();
+        ImGui::NewFrame();
+
+        if (g_show_menu)
+        {
+            ImGui::SetNextWindowSize({300.f, 100.f}, ImGuiCond_Once);
+            ImGui::SetNextWindowPos({10.f, 10.f}, ImGuiCond_Once);
+            ImGui::Begin("omath | OpenGL hook");
+            ImGui::Text("Hook active");
+            ImGui::Text("FPS: %.1f", ImGui::GetIO().Framerate);
+            ImGui::Text("INSERT toggles this window");
+            ImGui::End();
+        }
+
+        ImGui::Render();
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+    }
+
+    void hook_when_opengl_is_loaded()
+    {
+        while (!GetModuleHandle("opengl32.dll"))
+            std::this_thread::sleep_for(g_module_wait_delay);
+
+        auto& mgr = omath::hooks::HooksManager::get();
+        mgr.set_on_opengl_swap_buffers(on_swap_buffers);
+        (void)mgr.hook_opengl();
+    }
+} // namespace
+
+BOOL WINAPI DllMain(HINSTANCE h_instance, DWORD reason, LPVOID)
+{
+    if (reason == DLL_PROCESS_ATTACH)
+    {
+        DisableThreadLibraryCalls(h_instance);
+        std::thread{hook_when_opengl_is_loaded}.detach();
+    }
+    else if (reason == DLL_PROCESS_DETACH)
+    {
+        auto& mgr = omath::hooks::HooksManager::get();
+        mgr.unhook_wnd_proc();
+        mgr.unhook_opengl();
+
+        if (g_initialized)
+        {
+            ImGui_ImplOpenGL3_Shutdown();
+            ImGui_ImplWin32_Shutdown();
+            ImGui::DestroyContext();
+        }
+    }
+    return true;
+}

include/omath/hooks/hooks_manager.hpp

@@ -1,11 +1,13 @@
 #pragma once
 
 #ifdef OMATH_ENABLE_HOOKING
+#include <cstdint>
 #include <functional>
+#include <memory>
 #include <optional>
 #include <shared_mutex>
-#include <cstdint>
 
+#ifdef _WIN32
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
@@ -13,9 +15,15 @@
 #define NOMINMAX
 #endif
 #include <Windows.h>
-#include <dxgi.h>
-#include <d3d9.h>
 #include <d3d12.h>
+#include <d3d9.h>
+#include <dxgi.h>
+#endif // _WIN32
+
+#ifdef __linux__
+#include <GL/glx.h>
+#endif // __linux__
+
 #include <safetyhook.hpp>
 
 namespace omath::hooks
@@ -23,25 +31,42 @@ namespace omath::hooks
     class HooksManager final
     {
         HooksManager() = default;
+
     public:
+#ifdef _WIN32
         // IDXGISwapChain callbacks — shared between DX11 and DX12 (same interface, same signature).
-        using present_callback               = std::function<void(IDXGISwapChain*, UINT, UINT)>;
+        using present_callback = std::function<void(IDXGISwapChain*, UINT, UINT)>;
-        using resize_buffers_callback        = std::function<void(IDXGISwapChain*, UINT, UINT, UINT, DXGI_FORMAT, UINT)>;
+        using resize_buffers_callback = std::function<void(IDXGISwapChain*, UINT, UINT, UINT, DXGI_FORMAT, UINT)>;
-        using execute_command_lists_callback = std::function<void(ID3D12CommandQueue*, UINT, ID3D12CommandList* const*)>;
+        using execute_command_lists_callback =
+                std::function<void(ID3D12CommandQueue*, UINT, ID3D12CommandList* const*)>;
 
         // IDirect3DDevice9 callbacks — DX9 only.
-        using dx9_present_callback   = std::function<void(IDirect3DDevice9*, const RECT*, const RECT*, HWND, const RGNDATA*)>;
+        using dx9_present_callback =
-        using dx9_reset_callback     = std::function<void(IDirect3DDevice9*, D3DPRESENT_PARAMETERS*)>;
+                std::function<void(IDirect3DDevice9*, const RECT*, const RECT*, HWND, const RGNDATA*)>;
+        using dx9_reset_callback = std::function<void(IDirect3DDevice9*, D3DPRESENT_PARAMETERS*)>;
         using dx9_end_scene_callback = std::function<void(IDirect3DDevice9*)>;
 
+        // OpenGL callback — Windows. Fires before the hooked buffer swap function calls the original.
+        using opengl_swap_buffers_callback = std::function<void(HDC)>;
+
         // Return nullopt to pass the message to the original WndProc; return a value to intercept it.
         using wnd_proc_callback = std::function<std::optional<LRESULT>(HWND, UINT, WPARAM, LPARAM)>;
+#endif // _WIN32
+
+#ifdef __linux__
+        // OpenGL/GLX callback — Linux. Fires before glXSwapBuffers calls the original.
+        using opengl_swap_buffers_callback = std::function<void(Display*, GLXDrawable)>;
+#endif // __linux__
+
+        template<typename Callback>
+        using callback_ptr = std::shared_ptr<const Callback>;
 
         [[nodiscard]] static HooksManager& get();
-        HooksManager(const HooksManager&)            = delete;
+        HooksManager(const HooksManager&) = delete;
         HooksManager& operator=(const HooksManager&) = delete;
         ~HooksManager();
 
+#ifdef _WIN32
         [[nodiscard]] bool hook_dx9();
         void unhook_dx9();
         void set_on_dx9_present(dx9_present_callback callback);
@@ -53,7 +78,13 @@ namespace omath::hooks
 
         [[nodiscard]] bool hook_dx12();
         void unhook_dx12();
+#endif // _WIN32
 
+        [[nodiscard]] bool hook_opengl();
+        void unhook_opengl();
+        void set_on_opengl_swap_buffers(opengl_swap_buffers_callback callback);
+
+#ifdef _WIN32
         // Present and ResizeBuffers callbacks fire for whichever of DX11/DX12 is hooked.
         void set_on_present(present_callback callback);
         void set_on_resize_buffers(resize_buffers_callback callback);
@@ -62,38 +93,70 @@ namespace omath::hooks
         [[nodiscard]] bool hook_wnd_proc(HWND hwnd);
         void unhook_wnd_proc();
         void set_on_wnd_proc(wnd_proc_callback callback);
+#endif // _WIN32
 
     private:
+#ifdef _WIN32
+        [[nodiscard]]
         static HRESULT __stdcall dx9_present_detour(IDirect3DDevice9* p_device, const RECT* p_source_rect,
                                                     const RECT* p_dest_rect, HWND h_dest_window_override,
                                                     const RGNDATA* p_dirty_region);
+        [[nodiscard]]
         static HRESULT __stdcall dx9_reset_detour(IDirect3DDevice9* p_device,
                                                   D3DPRESENT_PARAMETERS* p_presentation_parameters);
+        [[nodiscard]]
         static HRESULT __stdcall dx9_end_scene_detour(IDirect3DDevice9* p_device);
 
+        [[nodiscard]]
         static HRESULT __stdcall dx11_present_detour(IDXGISwapChain* p_swap_chain, UINT sync_interval, UINT flags);
-        static HRESULT __stdcall dx11_resize_buffers_detour(IDXGISwapChain* p_swap_chain, UINT buffer_count,
+        [[nodiscard]]
-                                                            UINT width, UINT height, DXGI_FORMAT new_format,
+        static HRESULT __stdcall dx11_resize_buffers_detour(IDXGISwapChain* p_swap_chain, UINT buffer_count, UINT width,
-                                                            UINT swap_chain_flags);
+                                                            UINT height, DXGI_FORMAT new_format, UINT swap_chain_flags);
-
+        [[nodiscard]]
         static HRESULT __stdcall dx12_present_detour(IDXGISwapChain* p_swap_chain, UINT sync_interval, UINT flags);
-        static HRESULT __stdcall dx12_resize_buffers_detour(IDXGISwapChain* p_swap_chain, UINT buffer_count,
+        [[nodiscard]]
-                                                            UINT width, UINT height, DXGI_FORMAT new_format,
+        static HRESULT __stdcall dx12_resize_buffers_detour(IDXGISwapChain* p_swap_chain, UINT buffer_count, UINT width,
-                                                            UINT swap_chain_flags);
+                                                            UINT height, DXGI_FORMAT new_format, UINT swap_chain_flags);
         static void __stdcall dx12_execute_command_lists_detour(ID3D12CommandQueue* p_command_queue,
                                                                 UINT num_command_lists,
                                                                 ID3D12CommandList* const* pp_command_lists);
 
+        [[nodiscard]]
+        static BOOL __stdcall opengl_wgl_swap_buffers_detour(HDC hdc);
+        [[nodiscard]]
+        static BOOL __stdcall opengl_swap_buffers_detour(HDC hdc);
+
+        [[nodiscard]]
         static LRESULT __stdcall wnd_proc_detour(HWND hwnd, UINT msg, WPARAM w_param, LPARAM l_param);
+#endif // _WIN32
 
-        mutable std::shared_mutex m_mutex;
+#ifdef __linux__
+        static void opengl_glx_swap_buffers_detour(Display* display, GLXDrawable drawable);
+#endif // __linux__
 
-        bool m_is_dx9_hooked      = false;
+        mutable std::shared_mutex m_hook_state_mutex;
-        bool m_is_dx11_hooked     = false;
+
-        bool m_is_dx12_hooked     = false;
+#ifdef _WIN32
+        mutable std::shared_mutex m_dx9_present_mutex;
+        mutable std::shared_mutex m_dx9_reset_mutex;
+        mutable std::shared_mutex m_dx9_end_scene_mutex;
+
+        mutable std::shared_mutex m_present_mutex;
+        mutable std::shared_mutex m_resize_buffers_mutex;
+        mutable std::shared_mutex m_execute_command_lists_mutex;
+
+        mutable std::shared_mutex m_wnd_proc_mutex;
+#endif // _WIN32
+
+        mutable std::shared_mutex m_opengl_swap_buffers_mutex;
+
+#ifdef _WIN32
+        bool m_is_dx9_hooked = false;
+        bool m_is_dx11_hooked = false;
+        bool m_is_dx12_hooked = false;
         bool m_is_wnd_proc_hooked = false;
 
-        HWND    m_hooked_hwnd      = nullptr;
+        HWND m_hooked_hwnd = nullptr;
         WNDPROC m_original_wndproc = nullptr;
 
         safetyhook::InlineHook m_dx9_present_hook;
@@ -107,16 +170,31 @@ namespace omath::hooks
         safetyhook::InlineHook m_dx12_resize_buffers_hook;
         safetyhook::InlineHook m_dx12_execute_command_lists_hook;
 
-        dx9_present_callback   m_dx9_present_cb;
+        safetyhook::InlineHook m_opengl_wgl_swap_buffers_hook;
-        dx9_reset_callback     m_dx9_reset_cb;
+        safetyhook::InlineHook m_opengl_swap_buffers_hook;
-        dx9_end_scene_callback m_dx9_end_scene_cb;
+#endif // _WIN32
 
-        present_callback               m_present_cb;
+#ifdef __linux__
-        resize_buffers_callback        m_resize_buffers_cb;
+        safetyhook::InlineHook m_opengl_glx_swap_buffers_hook;
-        execute_command_lists_callback m_execute_command_lists_cb;
+#endif // __linux__
-        wnd_proc_callback              m_wnd_proc_cb;
+
+        bool m_is_opengl_hooked = false;
+
+#ifdef _WIN32
+        callback_ptr<dx9_present_callback> m_dx9_present_cb;
+        callback_ptr<dx9_reset_callback> m_dx9_reset_cb;
+        callback_ptr<dx9_end_scene_callback> m_dx9_end_scene_cb;
+
+        callback_ptr<present_callback> m_present_cb;
+        callback_ptr<resize_buffers_callback> m_resize_buffers_cb;
+        callback_ptr<execute_command_lists_callback> m_execute_command_lists_cb;
+
+        callback_ptr<wnd_proc_callback> m_wnd_proc_cb;
+#endif // _WIN32
+
+        callback_ptr<opengl_swap_buffers_callback> m_opengl_swap_buffers_cb;
     };
-}
+} // namespace omath::hooks
 
 #else // !OMATH_ENABLE_HOOKING
 
@@ -125,11 +203,12 @@ namespace omath::hooks
     class HooksManager final
     {
         HooksManager() = default;
+
     public:
         [[nodiscard]] static HooksManager& get();
         HooksManager(const HooksManager&) = delete;
         ~HooksManager();
     };
-}
+} // namespace omath::hooks
 
 #endif

source/hooks/hooks_manager.cpp

@@ -1,10 +1,20 @@
 #include "omath/hooks/hooks_manager.hpp"
 
 #ifdef OMATH_ENABLE_HOOKING
+
+#ifdef _WIN32
 #include <d3d11.h>
+#endif // _WIN32
+
+#ifdef __linux__
+#include <dlfcn.h>
+#endif // __linux__
 
 namespace
 {
+#ifdef _WIN32
+    thread_local bool g_is_inside_opengl_swap_buffers = false;
+
     class DummyWindow final
     {
         WNDCLASSEX m_window_class{};
@@ -13,14 +23,14 @@ namespace
     public:
         DummyWindow()
         {
-            m_window_class.cbSize        = sizeof(WNDCLASSEX);
+            m_window_class.cbSize = sizeof(WNDCLASSEX);
-            m_window_class.style         = CS_HREDRAW | CS_VREDRAW;
+            m_window_class.style = CS_HREDRAW | CS_VREDRAW;
-            m_window_class.lpfnWndProc   = DefWindowProc;
+            m_window_class.lpfnWndProc = DefWindowProc;
-            m_window_class.hInstance     = GetModuleHandle(nullptr);
+            m_window_class.hInstance = GetModuleHandle(nullptr);
             m_window_class.lpszClassName = "OM";
             RegisterClassEx(&m_window_class);
-            m_window_handle = CreateWindow(m_window_class.lpszClassName, "Dummy", WS_OVERLAPPEDWINDOW,
+            m_window_handle = CreateWindow(m_window_class.lpszClassName, "Dummy", WS_OVERLAPPEDWINDOW, 0, 0, 100, 100,
-                                           0, 0, 100, 100, nullptr, nullptr, m_window_class.hInstance, nullptr);
+                                           nullptr, nullptr, m_window_class.hInstance, nullptr);
         }
         ~DummyWindow()
         {
@@ -28,8 +38,14 @@ namespace
                 DestroyWindow(m_window_handle);
             UnregisterClass(m_window_class.lpszClassName, m_window_class.hInstance);
         }
-        [[nodiscard]] HWND handle() const { return m_window_handle; }
+        [[nodiscard]] HWND handle() const
-        [[nodiscard]] bool valid()  const { return m_window_handle != nullptr; }
+        {
+            return m_window_handle;
+        }
+        [[nodiscard]] bool valid() const
+        {
+            return m_window_handle != nullptr;
+        }
     };
 
     void* vtable_fn(void* com_obj, std::size_t index)
@@ -37,6 +53,15 @@ namespace
         return (*reinterpret_cast<void***>(com_obj))[index];
     }
 
+    void* module_proc(const char* module_name, const char* proc_name)
+    {
+        const HMODULE module = GetModuleHandle(module_name);
+        if (!module)
+            return nullptr;
+
+        return reinterpret_cast<void*>(GetProcAddress(module, proc_name));
+    }
+
     struct dx12_vtable_fns
     {
         void* present;
@@ -47,25 +72,31 @@ namespace
     // RAII wrapper so all early-return paths release COM objects automatically.
     struct dx12_com_objects
     {
-        IDXGIFactory*              factory           = nullptr;
+        IDXGIFactory* factory = nullptr;
-        ID3D12Device*              device            = nullptr;
+        ID3D12Device* device = nullptr;
-        ID3D12CommandQueue*        command_queue     = nullptr;
+        ID3D12CommandQueue* command_queue = nullptr;
-        ID3D12CommandAllocator*    command_allocator = nullptr;
+        ID3D12CommandAllocator* command_allocator = nullptr;
-        ID3D12GraphicsCommandList* command_list      = nullptr;
+        ID3D12GraphicsCommandList* command_list = nullptr;
-        IDXGISwapChain*            swap_chain        = nullptr;
+        IDXGISwapChain* swap_chain = nullptr;
 
         dx12_com_objects() = default;
-        dx12_com_objects(const dx12_com_objects&)            = delete;
+        dx12_com_objects(const dx12_com_objects&) = delete;
         dx12_com_objects& operator=(const dx12_com_objects&) = delete;
 
         ~dx12_com_objects()
         {
-            if (swap_chain)        swap_chain->Release();
+            if (swap_chain)
-            if (command_list)      command_list->Release();
+                swap_chain->Release();
-            if (command_allocator) command_allocator->Release();
+            if (command_list)
-            if (command_queue)     command_queue->Release();
+                command_list->Release();
-            if (device)            device->Release();
+            if (command_allocator)
-            if (factory)           factory->Release();
+                command_allocator->Release();
+            if (command_queue)
+                command_queue->Release();
+            if (device)
+                device->Release();
+            if (factory)
+                factory->Release();
         }
     };
 
@@ -75,14 +106,14 @@ namespace
         using d3d12_create_device_fn = HRESULT(__stdcall*)(IUnknown*, D3D_FEATURE_LEVEL, REFIID, void**);
 
         const HMODULE d3d12_module = GetModuleHandle("d3d12.dll");
-        const HMODULE dxgi_module  = GetModuleHandle("dxgi.dll");
+        const HMODULE dxgi_module = GetModuleHandle("dxgi.dll");
         if (!d3d12_module || !dxgi_module)
             return std::nullopt;
 
-        const auto create_dxgi_factory = reinterpret_cast<create_dxgi_factory_fn>(
+        const auto create_dxgi_factory =
-            GetProcAddress(dxgi_module, "CreateDXGIFactory"));
+                reinterpret_cast<create_dxgi_factory_fn>(GetProcAddress(dxgi_module, "CreateDXGIFactory"));
-        const auto d3d12_create_device = reinterpret_cast<d3d12_create_device_fn>(
+        const auto d3d12_create_device =
-            GetProcAddress(d3d12_module, "D3D12CreateDevice"));
+                reinterpret_cast<d3d12_create_device_fn>(GetProcAddress(d3d12_module, "D3D12CreateDevice"));
 
         if (!create_dxgi_factory || !d3d12_create_device)
             return std::nullopt;
@@ -96,9 +127,8 @@ namespace
         if (objs.factory->EnumAdapters(0, &adapter) == DXGI_ERROR_NOT_FOUND)
             return std::nullopt;
 
-        const HRESULT device_hr = d3d12_create_device(adapter, D3D_FEATURE_LEVEL_11_0,
+        const HRESULT device_hr = d3d12_create_device(adapter, D3D_FEATURE_LEVEL_11_0, __uuidof(ID3D12Device),
-                                                       __uuidof(ID3D12Device),
+                                                      reinterpret_cast<void**>(&objs.device));
-                                                       reinterpret_cast<void**>(&objs.device));
         adapter->Release();
         if (FAILED(device_hr))
             return std::nullopt;
@@ -110,39 +140,39 @@ namespace
                                                    reinterpret_cast<void**>(&objs.command_queue))))
             return std::nullopt;
 
-        if (FAILED(objs.device->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_DIRECT,
+        if (FAILED(objs.device->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_DIRECT, __uuidof(ID3D12CommandAllocator),
-                                                        __uuidof(ID3D12CommandAllocator),
+                                                       reinterpret_cast<void**>(&objs.command_allocator))))
-                                                        reinterpret_cast<void**>(&objs.command_allocator))))
             return std::nullopt;
 
-        if (FAILED(objs.device->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, objs.command_allocator,
+        if (FAILED(objs.device->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, objs.command_allocator, nullptr,
-                                                   nullptr, __uuidof(ID3D12GraphicsCommandList),
+                                                  __uuidof(ID3D12GraphicsCommandList),
-                                                   reinterpret_cast<void**>(&objs.command_list))))
+                                                  reinterpret_cast<void**>(&objs.command_list))))
             return std::nullopt;
 
         DXGI_SWAP_CHAIN_DESC swap_chain_desc{};
-        swap_chain_desc.BufferDesc.Width       = 100;
+        swap_chain_desc.BufferDesc.Width = 100;
-        swap_chain_desc.BufferDesc.Height      = 100;
+        swap_chain_desc.BufferDesc.Height = 100;
         swap_chain_desc.BufferDesc.RefreshRate = {60, 1};
-        swap_chain_desc.BufferDesc.Format      = DXGI_FORMAT_R8G8B8A8_UNORM;
+        swap_chain_desc.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
-        swap_chain_desc.SampleDesc             = {1, 0};
+        swap_chain_desc.SampleDesc = {1, 0};
-        swap_chain_desc.BufferUsage            = DXGI_USAGE_RENDER_TARGET_OUTPUT;
+        swap_chain_desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
-        swap_chain_desc.BufferCount            = 2;
+        swap_chain_desc.BufferCount = 2;
-        swap_chain_desc.OutputWindow           = hwnd;
+        swap_chain_desc.OutputWindow = hwnd;
-        swap_chain_desc.Windowed               = TRUE;
+        swap_chain_desc.Windowed = TRUE;
-        swap_chain_desc.SwapEffect             = DXGI_SWAP_EFFECT_FLIP_DISCARD;
+        swap_chain_desc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
-        swap_chain_desc.Flags                  = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH;
+        swap_chain_desc.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH;
 
         if (FAILED(objs.factory->CreateSwapChain(objs.command_queue, &swap_chain_desc, &objs.swap_chain)))
             return std::nullopt;
 
         // objs destructor releases all COM objects after we capture the addresses.
         return dx12_vtable_fns{
-            vtable_fn(objs.swap_chain, 8),    // IDXGISwapChain::Present
+                vtable_fn(objs.swap_chain, 8), // IDXGISwapChain::Present
-            vtable_fn(objs.swap_chain, 13),   // IDXGISwapChain::ResizeBuffers
+                vtable_fn(objs.swap_chain, 13), // IDXGISwapChain::ResizeBuffers
-            vtable_fn(objs.command_queue, 10), // ID3D12CommandQueue::ExecuteCommandLists
+                vtable_fn(objs.command_queue, 10), // ID3D12CommandQueue::ExecuteCommandLists
         };
     }
+#endif // _WIN32
 } // namespace
 
 namespace omath::hooks
@@ -155,15 +185,19 @@ namespace omath::hooks
 
     HooksManager::~HooksManager()
     {
+#ifdef _WIN32
         unhook_wnd_proc();
         unhook_dx9();
         unhook_dx11();
         unhook_dx12();
+#endif // _WIN32
+        unhook_opengl();
     }
 
+#ifdef _WIN32
     bool HooksManager::hook_dx9()
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_hook_state_mutex);
         if (m_is_dx9_hooked)
             return true;
 
@@ -176,8 +210,8 @@ namespace omath::hooks
             return false;
 
         using direct3d_create9_fn = IDirect3D9*(__stdcall*)(UINT);
-        const auto direct3d_create9 = reinterpret_cast<direct3d_create9_fn>(
+        const auto direct3d_create9 =
-            GetProcAddress(d3d9_module, "Direct3DCreate9"));
+                reinterpret_cast<direct3d_create9_fn>(GetProcAddress(d3d9_module, "Direct3DCreate9"));
         if (!direct3d_create9)
             return false;
 
@@ -186,9 +220,9 @@ namespace omath::hooks
             return false;
 
         D3DPRESENT_PARAMETERS pp{};
-        pp.SwapEffect    = D3DSWAPEFFECT_DISCARD;
+        pp.SwapEffect = D3DSWAPEFFECT_DISCARD;
         pp.hDeviceWindow = window.handle();
-        pp.Windowed      = TRUE;
+        pp.Windowed = TRUE;
 
         IDirect3DDevice9* device = nullptr;
         if (FAILED(d3d9->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, window.handle(),
@@ -202,25 +236,21 @@ namespace omath::hooks
         //   Reset    = 16
         //   Present  = 17
         //   EndScene = 42
-        m_dx9_present_hook = safetyhook::create_inline(
+        m_dx9_present_hook =
-            vtable_fn(device, 17),
+                safetyhook::create_inline(vtable_fn(device, 17), reinterpret_cast<void*>(&dx9_present_detour));
-            reinterpret_cast<void*>(&dx9_present_detour));
 
-        m_dx9_reset_hook = safetyhook::create_inline(
+        m_dx9_reset_hook = safetyhook::create_inline(vtable_fn(device, 16), reinterpret_cast<void*>(&dx9_reset_detour));
-            vtable_fn(device, 16),
-            reinterpret_cast<void*>(&dx9_reset_detour));
 
-        m_dx9_end_scene_hook = safetyhook::create_inline(
+        m_dx9_end_scene_hook =
-            vtable_fn(device, 42),
+                safetyhook::create_inline(vtable_fn(device, 42), reinterpret_cast<void*>(&dx9_end_scene_detour));
-            reinterpret_cast<void*>(&dx9_end_scene_detour));
 
         device->Release();
         d3d9->Release();
 
         if (!m_dx9_present_hook || !m_dx9_reset_hook || !m_dx9_end_scene_hook)
         {
-            m_dx9_present_hook   = {};
+            m_dx9_present_hook = {};
-            m_dx9_reset_hook     = {};
+            m_dx9_reset_hook = {};
             m_dx9_end_scene_hook = {};
             return false;
         }
@@ -231,34 +261,34 @@ namespace omath::hooks
 
     void HooksManager::unhook_dx9()
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_hook_state_mutex);
-        m_dx9_present_hook   = {};
+        m_dx9_present_hook = {};
-        m_dx9_reset_hook     = {};
+        m_dx9_reset_hook = {};
         m_dx9_end_scene_hook = {};
         m_is_dx9_hooked = false;
     }
 
     void HooksManager::set_on_dx9_present(dx9_present_callback callback)
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_dx9_present_mutex);
-        m_dx9_present_cb = std::move(callback);
+        m_dx9_present_cb = callback ? std::make_shared<dx9_present_callback>(std::move(callback)) : nullptr;
     }
 
     void HooksManager::set_on_dx9_reset(dx9_reset_callback callback)
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_dx9_reset_mutex);
-        m_dx9_reset_cb = std::move(callback);
+        m_dx9_reset_cb = callback ? std::make_shared<dx9_reset_callback>(std::move(callback)) : nullptr;
     }
 
     void HooksManager::set_on_dx9_end_scene(dx9_end_scene_callback callback)
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_dx9_end_scene_mutex);
-        m_dx9_end_scene_cb = std::move(callback);
+        m_dx9_end_scene_cb = callback ? std::make_shared<dx9_end_scene_callback>(std::move(callback)) : nullptr;
     }
 
     bool HooksManager::hook_dx11()
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_hook_state_mutex);
         if (m_is_dx11_hooked)
             return true;
 
@@ -271,46 +301,43 @@ namespace omath::hooks
             return false;
 
         using d3d11_create_device_and_swap_chain_fn =
-            HRESULT(__stdcall*)(IDXGIAdapter*, D3D_DRIVER_TYPE, HMODULE, UINT,
+                HRESULT(__stdcall*)(IDXGIAdapter*, D3D_DRIVER_TYPE, HMODULE, UINT, const D3D_FEATURE_LEVEL*, UINT, UINT,
-                                const D3D_FEATURE_LEVEL*, UINT, UINT,
+                                    const DXGI_SWAP_CHAIN_DESC*, IDXGISwapChain**, ID3D11Device**, D3D_FEATURE_LEVEL*,
-                                const DXGI_SWAP_CHAIN_DESC*, IDXGISwapChain**,
+                                    ID3D11DeviceContext**);
-                                ID3D11Device**, D3D_FEATURE_LEVEL*, ID3D11DeviceContext**);
 
         const auto create_device_and_swap_chain = reinterpret_cast<d3d11_create_device_and_swap_chain_fn>(
-            GetProcAddress(d3d11_module, "D3D11CreateDeviceAndSwapChain"));
+                GetProcAddress(d3d11_module, "D3D11CreateDeviceAndSwapChain"));
         if (!create_device_and_swap_chain)
             return false;
 
         DXGI_SWAP_CHAIN_DESC swap_chain_desc{};
-        swap_chain_desc.BufferDesc.Width       = 100;
+        swap_chain_desc.BufferDesc.Width = 100;
-        swap_chain_desc.BufferDesc.Height      = 100;
+        swap_chain_desc.BufferDesc.Height = 100;
         swap_chain_desc.BufferDesc.RefreshRate = {60, 1};
-        swap_chain_desc.BufferDesc.Format      = DXGI_FORMAT_R8G8B8A8_UNORM;
+        swap_chain_desc.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
-        swap_chain_desc.SampleDesc             = {1, 0};
+        swap_chain_desc.SampleDesc = {1, 0};
-        swap_chain_desc.BufferUsage            = DXGI_USAGE_RENDER_TARGET_OUTPUT;
+        swap_chain_desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
-        swap_chain_desc.BufferCount            = 1;
+        swap_chain_desc.BufferCount = 1;
-        swap_chain_desc.OutputWindow           = window.handle();
+        swap_chain_desc.OutputWindow = window.handle();
-        swap_chain_desc.Windowed               = TRUE;
+        swap_chain_desc.Windowed = TRUE;
-        swap_chain_desc.SwapEffect             = DXGI_SWAP_EFFECT_DISCARD;
+        swap_chain_desc.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
 
         constexpr D3D_FEATURE_LEVEL feature_levels[] = {D3D_FEATURE_LEVEL_11_0};
-        ID3D11Device*        device         = nullptr;
+        ID3D11Device* device = nullptr;
         ID3D11DeviceContext* device_context = nullptr;
-        IDXGISwapChain*      swap_chain     = nullptr;
+        IDXGISwapChain* swap_chain = nullptr;
 
-        if (FAILED(create_device_and_swap_chain(nullptr, D3D_DRIVER_TYPE_HARDWARE, nullptr, 0,
+        if (FAILED(create_device_and_swap_chain(nullptr, D3D_DRIVER_TYPE_HARDWARE, nullptr, 0, feature_levels, 1,
-                                                feature_levels, 1, D3D11_SDK_VERSION,
+                                                D3D11_SDK_VERSION, &swap_chain_desc, &swap_chain, &device, nullptr,
-                                                &swap_chain_desc, &swap_chain,
+                                                &device_context)))
-                                                &device, nullptr, &device_context)))
             return false;
 
-        m_dx11_present_hook = safetyhook::create_inline(
+        m_dx11_present_hook = safetyhook::create_inline(vtable_fn(swap_chain, 8), // IDXGISwapChain::Present
-            vtable_fn(swap_chain, 8),   // IDXGISwapChain::Present
+                                                        reinterpret_cast<void*>(&dx11_present_detour));
-            reinterpret_cast<void*>(&dx11_present_detour));
 
-        m_dx11_resize_buffers_hook = safetyhook::create_inline(
+        m_dx11_resize_buffers_hook =
-            vtable_fn(swap_chain, 13),  // IDXGISwapChain::ResizeBuffers
+                safetyhook::create_inline(vtable_fn(swap_chain, 13), // IDXGISwapChain::ResizeBuffers
-            reinterpret_cast<void*>(&dx11_resize_buffers_detour));
+                                          reinterpret_cast<void*>(&dx11_resize_buffers_detour));
 
         swap_chain->Release();
         device_context->Release();
@@ -318,7 +345,7 @@ namespace omath::hooks
 
         if (!m_dx11_present_hook || !m_dx11_resize_buffers_hook)
         {
-            m_dx11_present_hook        = {};
+            m_dx11_present_hook = {};
             m_dx11_resize_buffers_hook = {};
             return false;
         }
@@ -329,15 +356,15 @@ namespace omath::hooks
 
     void HooksManager::unhook_dx11()
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_hook_state_mutex);
-        m_dx11_present_hook        = {};
+        m_dx11_present_hook = {};
         m_dx11_resize_buffers_hook = {};
         m_is_dx11_hooked = false;
     }
 
     bool HooksManager::hook_dx12()
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_hook_state_mutex);
         if (m_is_dx12_hooked)
             return true;
 
@@ -349,22 +376,18 @@ namespace omath::hooks
         if (!fns)
             return false;
 
-        m_dx12_present_hook = safetyhook::create_inline(
+        m_dx12_present_hook = safetyhook::create_inline(fns->present, reinterpret_cast<void*>(&dx12_present_detour));
-            fns->present,
-            reinterpret_cast<void*>(&dx12_present_detour));
 
-        m_dx12_resize_buffers_hook = safetyhook::create_inline(
+        m_dx12_resize_buffers_hook =
-            fns->resize_buffers,
+                safetyhook::create_inline(fns->resize_buffers, reinterpret_cast<void*>(&dx12_resize_buffers_detour));
-            reinterpret_cast<void*>(&dx12_resize_buffers_detour));
 
         m_dx12_execute_command_lists_hook = safetyhook::create_inline(
-            fns->execute_command_lists,
+                fns->execute_command_lists, reinterpret_cast<void*>(&dx12_execute_command_lists_detour));
-            reinterpret_cast<void*>(&dx12_execute_command_lists_detour));
 
         if (!m_dx12_present_hook || !m_dx12_resize_buffers_hook || !m_dx12_execute_command_lists_hook)
         {
-            m_dx12_present_hook               = {};
+            m_dx12_present_hook = {};
-            m_dx12_resize_buffers_hook        = {};
+            m_dx12_resize_buffers_hook = {};
             m_dx12_execute_command_lists_hook = {};
             return false;
         }
@@ -375,122 +398,161 @@ namespace omath::hooks
 
     void HooksManager::unhook_dx12()
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_hook_state_mutex);
-        m_dx12_present_hook               = {};
+        m_dx12_present_hook = {};
-        m_dx12_resize_buffers_hook        = {};
+        m_dx12_resize_buffers_hook = {};
         m_dx12_execute_command_lists_hook = {};
         m_is_dx12_hooked = false;
     }
 
+    bool HooksManager::hook_opengl()
+    {
+        std::unique_lock lock(m_hook_state_mutex);
+        if (m_is_opengl_hooked)
+            return true;
+
+        if (void* wgl_swap_buffers = module_proc("opengl32.dll", "wglSwapBuffers"))
+        {
+            m_opengl_wgl_swap_buffers_hook = safetyhook::create_inline(
+                    wgl_swap_buffers, reinterpret_cast<void*>(&opengl_wgl_swap_buffers_detour));
+        }
+
+        if (void* swap_buffers = module_proc("gdi32.dll", "SwapBuffers"))
+        {
+            m_opengl_swap_buffers_hook =
+                    safetyhook::create_inline(swap_buffers, reinterpret_cast<void*>(&opengl_swap_buffers_detour));
+        }
+
+        if (!m_opengl_wgl_swap_buffers_hook && !m_opengl_swap_buffers_hook)
+        {
+            m_opengl_wgl_swap_buffers_hook = {};
+            m_opengl_swap_buffers_hook = {};
+            return false;
+        }
+
+        m_is_opengl_hooked = true;
+        return true;
+    }
+
+    void HooksManager::unhook_opengl()
+    {
+        std::unique_lock lock(m_hook_state_mutex);
+        m_opengl_wgl_swap_buffers_hook = {};
+        m_opengl_swap_buffers_hook = {};
+        m_is_opengl_hooked = false;
+    }
+
     void HooksManager::set_on_present(present_callback callback)
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_present_mutex);
-        m_present_cb = std::move(callback);
+        m_present_cb = callback ? std::make_shared<present_callback>(std::move(callback)) : nullptr;
     }
 
     void HooksManager::set_on_resize_buffers(resize_buffers_callback callback)
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_resize_buffers_mutex);
-        m_resize_buffers_cb = std::move(callback);
+        m_resize_buffers_cb = callback ? std::make_shared<resize_buffers_callback>(std::move(callback)) : nullptr;
     }
 
     void HooksManager::set_on_execute_command_lists(execute_command_lists_callback callback)
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_execute_command_lists_mutex);
-        m_execute_command_lists_cb = std::move(callback);
+        m_execute_command_lists_cb =
+                callback ? std::make_shared<execute_command_lists_callback>(std::move(callback)) : nullptr;
     }
 
     bool HooksManager::hook_wnd_proc(HWND hwnd)
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_hook_state_mutex);
         if (m_is_wnd_proc_hooked)
             return true;
 
         const auto prev = reinterpret_cast<WNDPROC>(
-            SetWindowLongPtr(hwnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(&wnd_proc_detour)));
+                SetWindowLongPtr(hwnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(&wnd_proc_detour)));
         if (!prev)
             return false;
 
-        m_hooked_hwnd        = hwnd;
+        m_hooked_hwnd = hwnd;
-        m_original_wndproc   = prev;
+        m_original_wndproc = prev;
         m_is_wnd_proc_hooked = true;
         return true;
     }
 
     void HooksManager::unhook_wnd_proc()
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_hook_state_mutex);
         if (!m_is_wnd_proc_hooked)
             return;
 
         SetWindowLongPtr(m_hooked_hwnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(m_original_wndproc));
-        m_hooked_hwnd        = nullptr;
+        m_hooked_hwnd = nullptr;
-        m_original_wndproc   = nullptr;
+        m_original_wndproc = nullptr;
         m_is_wnd_proc_hooked = false;
     }
 
     void HooksManager::set_on_wnd_proc(wnd_proc_callback callback)
     {
-        std::unique_lock lock(m_mutex);
+        std::unique_lock lock(m_wnd_proc_mutex);
-        m_wnd_proc_cb = std::move(callback);
+        m_wnd_proc_cb = callback ? std::make_shared<wnd_proc_callback>(std::move(callback)) : nullptr;
     }
 
-    // Detour implementations: copy callback under shared lock, call it unlocked,
+    // Detour implementations: copy a shared_ptr to the callback under shared lock, call it unlocked,
-    // then call original. This avoids a deadlock if the callback itself calls set_on_*().
+    // then call original. This avoids copying captured lambda state every frame and still avoids
+    // a deadlock if the callback itself calls set_on_*().
 
     HRESULT __stdcall HooksManager::dx9_present_detour(IDirect3DDevice9* p_device, const RECT* p_source_rect,
                                                        const RECT* p_dest_rect, HWND h_dest_window_override,
                                                        const RGNDATA* p_dirty_region)
     {
         auto& mgr = get();
-        dx9_present_callback cb;
+        callback_ptr<dx9_present_callback> cb;
         {
-            std::shared_lock lock(mgr.m_mutex);
+            std::shared_lock lock(mgr.m_dx9_present_mutex);
             cb = mgr.m_dx9_present_cb;
         }
         if (cb)
-            cb(p_device, p_source_rect, p_dest_rect, h_dest_window_override, p_dirty_region);
+            (*cb)(p_device, p_source_rect, p_dest_rect, h_dest_window_override, p_dirty_region);
-        return mgr.m_dx9_present_hook.call<HRESULT>(p_device, p_source_rect, p_dest_rect,
+        return mgr.m_dx9_present_hook.call<HRESULT>(p_device, p_source_rect, p_dest_rect, h_dest_window_override,
-                                                    h_dest_window_override, p_dirty_region);
+                                                    p_dirty_region);
     }
 
     HRESULT __stdcall HooksManager::dx9_reset_detour(IDirect3DDevice9* p_device,
                                                      D3DPRESENT_PARAMETERS* p_presentation_parameters)
     {
         auto& mgr = get();
-        dx9_reset_callback cb;
+        callback_ptr<dx9_reset_callback> cb;
         {
-            std::shared_lock lock(mgr.m_mutex);
+            std::shared_lock lock(mgr.m_dx9_reset_mutex);
             cb = mgr.m_dx9_reset_cb;
         }
         if (cb)
-            cb(p_device, p_presentation_parameters);
+            (*cb)(p_device, p_presentation_parameters);
         return mgr.m_dx9_reset_hook.call<HRESULT>(p_device, p_presentation_parameters);
     }
 
     HRESULT __stdcall HooksManager::dx9_end_scene_detour(IDirect3DDevice9* p_device)
     {
         auto& mgr = get();
-        dx9_end_scene_callback cb;
+        callback_ptr<dx9_end_scene_callback> cb;
         {
-            std::shared_lock lock(mgr.m_mutex);
+            std::shared_lock lock(mgr.m_dx9_end_scene_mutex);
             cb = mgr.m_dx9_end_scene_cb;
         }
         if (cb)
-            cb(p_device);
+            (*cb)(p_device);
         return mgr.m_dx9_end_scene_hook.call<HRESULT>(p_device);
     }
 
     HRESULT __stdcall HooksManager::dx11_present_detour(IDXGISwapChain* p_swap_chain, UINT sync_interval, UINT flags)
     {
         auto& mgr = get();
-        present_callback cb;
+        callback_ptr<present_callback> cb;
         {
-            std::shared_lock lock(mgr.m_mutex);
+            std::shared_lock lock(mgr.m_present_mutex);
             cb = mgr.m_present_cb;
         }
         if (cb)
-            cb(p_swap_chain, sync_interval, flags);
+            (*cb)(p_swap_chain, sync_interval, flags);
         return mgr.m_dx11_present_hook.call<HRESULT>(p_swap_chain, sync_interval, flags);
     }
 
@@ -499,27 +561,27 @@ namespace omath::hooks
                                                                UINT swap_chain_flags)
     {
         auto& mgr = get();
-        resize_buffers_callback cb;
+        callback_ptr<resize_buffers_callback> cb;
         {
-            std::shared_lock lock(mgr.m_mutex);
+            std::shared_lock lock(mgr.m_resize_buffers_mutex);
             cb = mgr.m_resize_buffers_cb;
         }
         if (cb)
-            cb(p_swap_chain, buffer_count, width, height, new_format, swap_chain_flags);
+            (*cb)(p_swap_chain, buffer_count, width, height, new_format, swap_chain_flags);
-        return mgr.m_dx11_resize_buffers_hook.call<HRESULT>(p_swap_chain, buffer_count, width, height,
+        return mgr.m_dx11_resize_buffers_hook.call<HRESULT>(p_swap_chain, buffer_count, width, height, new_format,
-                                                            new_format, swap_chain_flags);
+                                                            swap_chain_flags);
     }
 
     HRESULT __stdcall HooksManager::dx12_present_detour(IDXGISwapChain* p_swap_chain, UINT sync_interval, UINT flags)
     {
         auto& mgr = get();
-        present_callback cb;
+        callback_ptr<present_callback> cb;
         {
-            std::shared_lock lock(mgr.m_mutex);
+            std::shared_lock lock(mgr.m_present_mutex);
             cb = mgr.m_present_cb;
         }
         if (cb)
-            cb(p_swap_chain, sync_interval, flags);
+            (*cb)(p_swap_chain, sync_interval, flags);
         return mgr.m_dx12_present_hook.call<HRESULT>(p_swap_chain, sync_interval, flags);
     }
 
@@ -528,15 +590,15 @@ namespace omath::hooks
                                                                UINT swap_chain_flags)
     {
         auto& mgr = get();
-        resize_buffers_callback cb;
+        callback_ptr<resize_buffers_callback> cb;
         {
-            std::shared_lock lock(mgr.m_mutex);
+            std::shared_lock lock(mgr.m_resize_buffers_mutex);
             cb = mgr.m_resize_buffers_cb;
         }
         if (cb)
-            cb(p_swap_chain, buffer_count, width, height, new_format, swap_chain_flags);
+            (*cb)(p_swap_chain, buffer_count, width, height, new_format, swap_chain_flags);
-        return mgr.m_dx12_resize_buffers_hook.call<HRESULT>(p_swap_chain, buffer_count, width, height,
+        return mgr.m_dx12_resize_buffers_hook.call<HRESULT>(p_swap_chain, buffer_count, width, height, new_format,
-                                                            new_format, swap_chain_flags);
+                                                            swap_chain_flags);
     }
 
     void __stdcall HooksManager::dx12_execute_command_lists_detour(ID3D12CommandQueue* p_command_queue,
@@ -544,33 +606,125 @@ namespace omath::hooks
                                                                    ID3D12CommandList* const* pp_command_lists)
     {
         auto& mgr = get();
-        execute_command_lists_callback cb;
+        callback_ptr<execute_command_lists_callback> cb;
         {
-            std::shared_lock lock(mgr.m_mutex);
+            std::shared_lock lock(mgr.m_execute_command_lists_mutex);
             cb = mgr.m_execute_command_lists_cb;
         }
         if (cb)
-            cb(p_command_queue, num_command_lists, pp_command_lists);
+            (*cb)(p_command_queue, num_command_lists, pp_command_lists);
         mgr.m_dx12_execute_command_lists_hook.call<void>(p_command_queue, num_command_lists, pp_command_lists);
     }
 
+    BOOL __stdcall HooksManager::opengl_wgl_swap_buffers_detour(HDC hdc)
+    {
+        auto& mgr = get();
+
+        if (!g_is_inside_opengl_swap_buffers)
+            return mgr.m_opengl_wgl_swap_buffers_hook.call<BOOL>(hdc);
+        g_is_inside_opengl_swap_buffers = true;
+
+        callback_ptr<opengl_swap_buffers_callback> cb;
+        {
+            std::shared_lock lock(mgr.m_opengl_swap_buffers_mutex);
+            cb = mgr.m_opengl_swap_buffers_cb;
+        }
+        if (cb)
+            (*cb)(hdc);
+
+        const BOOL result = mgr.m_opengl_wgl_swap_buffers_hook.call<BOOL>(hdc);
+        g_is_inside_opengl_swap_buffers = false;
+        return result;
+    }
+
+    BOOL __stdcall HooksManager::opengl_swap_buffers_detour(HDC hdc)
+    {
+        auto& mgr = get();
+
+        if (g_is_inside_opengl_swap_buffers)
+            return mgr.m_opengl_swap_buffers_hook.call<BOOL>(hdc);
+        g_is_inside_opengl_swap_buffers = true;
+
+        callback_ptr<opengl_swap_buffers_callback> cb;
+        {
+            std::shared_lock lock(mgr.m_opengl_swap_buffers_mutex);
+            cb = mgr.m_opengl_swap_buffers_cb;
+        }
+        if (cb)
+            (*cb)(hdc);
+
+        const BOOL result = mgr.m_opengl_swap_buffers_hook.call<BOOL>(hdc);
+        g_is_inside_opengl_swap_buffers = false;
+        return result;
+    }
+
     LRESULT __stdcall HooksManager::wnd_proc_detour(HWND hwnd, UINT msg, WPARAM w_param, LPARAM l_param)
     {
         auto& mgr = get();
-        wnd_proc_callback cb;
+        callback_ptr<wnd_proc_callback> cb;
         WNDPROC original;
         {
-            std::shared_lock lock(mgr.m_mutex);
+            std::shared_lock lock(mgr.m_wnd_proc_mutex);
-            cb       = mgr.m_wnd_proc_cb;
+            cb = mgr.m_wnd_proc_cb;
             original = mgr.m_original_wndproc;
         }
         if (cb)
         {
-            if (const auto result = cb(hwnd, msg, w_param, l_param))
+            if (const auto result = (*cb)(hwnd, msg, w_param, l_param))
                 return *result;
         }
         return CallWindowProc(original, hwnd, msg, w_param, l_param);
     }
+#endif // _WIN32
+
+#ifdef __linux__
+    bool HooksManager::hook_opengl()
+    {
+        std::unique_lock lock(m_hook_state_mutex);
+        if (m_is_opengl_hooked)
+            return true;
+
+        void* glx_swap_buffers = dlsym(RTLD_DEFAULT, "glXSwapBuffers");
+        if (!glx_swap_buffers)
+            return false;
+
+        m_opengl_glx_swap_buffers_hook = safetyhook::create_inline(
+                glx_swap_buffers, reinterpret_cast<void*>(&opengl_glx_swap_buffers_detour));
+
+        if (!m_opengl_glx_swap_buffers_hook)
+            return false;
+
+        m_is_opengl_hooked = true;
+        return true;
+    }
+
+    void HooksManager::unhook_opengl()
+    {
+        std::unique_lock lock(m_hook_state_mutex);
+        m_opengl_glx_swap_buffers_hook = {};
+        m_is_opengl_hooked = false;
+    }
+
+    void HooksManager::opengl_glx_swap_buffers_detour(Display* display, GLXDrawable drawable)
+    {
+        auto& mgr = get();
+        callback_ptr<opengl_swap_buffers_callback> cb;
+        {
+            std::shared_lock lock(mgr.m_opengl_swap_buffers_mutex);
+            cb = mgr.m_opengl_swap_buffers_cb;
+        }
+        if (cb)
+            (*cb)(display, drawable);
+        mgr.m_opengl_glx_swap_buffers_hook.call<void>(display, drawable);
+    }
+#endif // __linux__
+
+    void HooksManager::set_on_opengl_swap_buffers(opengl_swap_buffers_callback callback)
+    {
+        std::unique_lock lock(m_opengl_swap_buffers_mutex);
+        m_opengl_swap_buffers_cb =
+                callback ? std::make_shared<opengl_swap_buffers_callback>(std::move(callback)) : nullptr;
+    }
 } // namespace omath::hooks
 
 #else // !OMATH_ENABLE_HOOKING