[Feat] (MG_Impl): add macOS CGL and NSOpenGL frontends

CMakeLists.txt

@@ -273,6 +273,15 @@ set(SOURCE_FILES
     MobileGL/MG_State/GLState/RenderbufferState/RenderbufferState.cpp
 )
 
+if (APPLE)
+    list(APPEND SOURCE_FILES
+        MobileGL/MG_Impl/CGLImpl/CGLImpl.cpp
+        MobileGL/MG_Impl/CGLImpl/Exporting/Definitions.cpp
+        MobileGL/MG_Impl/DyldInterpose/DyldInterpose.cpp
+        MobileGL/MG_Impl/NSOpenGLImpl/NSOpenGLImpl.cpp
+    )
+endif()
+
 set(MOBILEGL_LINK_LIBRARIES
         glslang::glslang
         spirv-cross-c
@@ -388,12 +397,16 @@ if (APPLE)
     target_link_libraries(${CMAKE_PROJECT_NAME} PUBLIC
         "-framework Cocoa"
         "-framework QuartzCore"
-        "-framework Foundation")
+        "-framework Foundation"
+        "-framework OpenGL"
+        objc)
     if(TARGET ${CMAKE_PROJECT_NAME}_s)
         target_link_libraries(${CMAKE_PROJECT_NAME}_s PUBLIC
             "-framework Cocoa"
             "-framework QuartzCore"
-            "-framework Foundation")
+            "-framework Foundation"
+            "-framework OpenGL"
+            objc)
     endif()
 endif()
 

MobileGL/Defines.h

@@ -32,6 +32,8 @@
 #define MOBILEGL_GLX_API MOBILEGL_API
 #define MOBILEGL_GL_API MOBILEGL_API
 #define MOBILEGL_EGL_API MOBILEGL_API
+#define MOBILEGL_CGL_API MOBILEGL_API
+#define MOBILEGL_NSOPENGL_API MOBILEGL_API
 
 // ====================== MobileGL configurations ======================= //
 #ifndef MOBILEGL_LOG_ACTIVE_LEVEL

MobileGL/Init.cpp

@@ -18,6 +18,29 @@
 namespace MobileGL {
     namespace {
         Bool g_isInitialized = false;
+
+        void DestroyImpl(Bool logLifecycle) {
+            if (!g_isInitialized) {
+                return;
+            }
+
+            if (logLifecycle) {
+                MGLOG_I("MobileGL closing...");
+            }
+            glslang::FinalizeProcess();
+            MG_Backend::pActiveBackendObject.reset();
+            MG_State::pGLContext.reset();
+            MG_State::pEGLContext.reset();
+            MG_Impl::GLImpl::TextureImpl::pProxyTextureManager.reset();
+            MG_Impl::GLImpl::FramebufferImpl::pDefaultFramebufferInfo.reset();
+            MG_Backend::gBackendFunctionsTable = {};
+            g_isInitialized = false;
+            if (logLifecycle) {
+                MG_Util::Debug::Close();
+            }
+
+            // TODO: add and use Destroy functions for other subsystems
+        }
     }
 
     void Initialize() {
@@ -43,22 +66,7 @@ namespace MobileGL {
     }
 
     void Destroy() {
-        if (!g_isInitialized) {
+        DestroyImpl(true);
-            return;
-        }
-
-        MGLOG_I("MobileGL closing...");
-        glslang::FinalizeProcess();
-        MG_Backend::pActiveBackendObject.reset();
-        MG_State::pGLContext.reset();
-        MG_State::pEGLContext.reset();
-        MG_Impl::GLImpl::TextureImpl::pProxyTextureManager.reset();
-        MG_Impl::GLImpl::FramebufferImpl::pDefaultFramebufferInfo.reset();
-        MG_Backend::gBackendFunctionsTable = {};
-        g_isInitialized = false;
-        MG_Util::Debug::Close();
-
-        // TODO: add and use Destroy functions for other subsystems
     }
 
 #if defined(__linux__) || defined(__APPLE__)
@@ -70,7 +78,12 @@ namespace MobileGL {
         if (std::getenv("MOBILEGL_TRACE_SKIP_AUTODESTROY") != nullptr) {
             return;
         }
-        Destroy();
+#if defined(__APPLE__)
+        // macOS injected dylibs can run destructors after logging/backend static state is already torn down.
+        return;
+#else
+        DestroyImpl(false);
+#endif
     }
 #endif
 

MobileGL/MG_Impl/CGLImpl/CGLImpl.cpp

@@ -0,0 +1,649 @@
+// MobileGL - MobileGL/MG_Impl/CGLImpl/CGLImpl.cpp
+// Copyright (c) 2025-2026 MobileGL-Dev
+// Licensed under the GNU Lesser General Public License v3.0:
+//   https://www.gnu.org/licenses/gpl-3.0.txt
+//   https://www.gnu.org/licenses/lgpl-3.0.txt
+// SPDX-License-Identifier: LGPL-3.0-only
+// End of Source File Header
+
+#include "CGLImpl.h"
+
+#if defined(__APPLE__)
+#include "../EGLImpl/EGLImpl.h"
+
+namespace MobileGL::MG_Impl::CGLImpl {
+    namespace {
+        struct PixelFormatObject {
+            Uint32 RetainCount = 1;
+            Bool DoubleBuffer = true;
+            GLint ColorSize = 24;
+            GLint AlphaSize = 8;
+            GLint DepthSize = 24;
+            GLint StencilSize = 8;
+            GLint SampleBuffers = 0;
+            GLint Samples = 0;
+            GLint Profile = kCGLOGLPVersion_3_2_Core;
+            GLint RendererId = 0x4d474c;
+        };
+
+        struct ContextObject {
+            Uint32 RetainCount = 1;
+            CGLPixelFormatObj PixelFormat = nullptr;
+            CGLContextObj Share = nullptr;
+            EGLDisplay Display = EGL_NO_DISPLAY;
+            EGLConfig Config = nullptr;
+            EGLContext Context = EGL_NO_CONTEXT;
+            EGLSurface Surface = EGL_NO_SURFACE;
+            void* NSObject = nullptr;
+            void* View = nullptr;
+            void* MetalLayer = nullptr;
+            GLint SwapInterval = 1;
+            GLint VirtualScreen = 0;
+            GLint SurfaceBackingSize[2] = {0, 0};
+            Bool HasDrawable = false;
+            Bool Locked = false;
+        };
+
+        std::recursive_mutex& RegistryMutex() {
+            static auto* mutex = new std::recursive_mutex();
+            return *mutex;
+        }
+
+        Uint64& NextPixelFormatHandle() {
+            static auto* handle = new Uint64(1);
+            return *handle;
+        }
+
+        Uint64& NextContextHandle() {
+            static auto* handle = new Uint64(1);
+            return *handle;
+        }
+
+        UnorderedMap<CGLPixelFormatObj, PixelFormatObject>& PixelFormats() {
+            static auto* formats = new UnorderedMap<CGLPixelFormatObj, PixelFormatObject>();
+            return *formats;
+        }
+
+        UnorderedMap<CGLContextObj, ContextObject>& Contexts() {
+            static auto* contexts = new UnorderedMap<CGLContextObj, ContextObject>();
+            return *contexts;
+        }
+
+        UnorderedMap<std::thread::id, CGLContextObj>& CurrentContexts() {
+            static auto* contexts = new UnorderedMap<std::thread::id, CGLContextObj>();
+            return *contexts;
+        }
+
+        CGLPixelFormatObj EncodePixelFormat(Uint64 handle) {
+            return reinterpret_cast<CGLPixelFormatObj>(static_cast<SizeT>(handle));
+        }
+
+        CGLContextObj EncodeContext(Uint64 handle) {
+            return reinterpret_cast<CGLContextObj>(static_cast<SizeT>(handle));
+        }
+
+        std::thread::id CurrentThreadKey() {
+            return std::this_thread::get_id();
+        }
+
+        Bool AttributeHasValue(CGLPixelFormatAttribute attrib) {
+            switch (attrib) {
+            case kCGLPFAColorSize:
+            case kCGLPFAAlphaSize:
+            case kCGLPFADepthSize:
+            case kCGLPFAStencilSize:
+            case kCGLPFASampleBuffers:
+            case kCGLPFASamples:
+            case kCGLPFARendererID:
+            case kCGLPFADisplayMask:
+            case kCGLPFAOpenGLProfile:
+                return true;
+            default:
+                return false;
+            }
+        }
+
+        void ApplyPixelFormatAttribute(PixelFormatObject& pixelFormat,
+                                       CGLPixelFormatAttribute attrib,
+                                       GLint value) {
+            switch (attrib) {
+            case kCGLPFADoubleBuffer:
+                pixelFormat.DoubleBuffer = true;
+                break;
+            case kCGLPFAColorSize:
+                pixelFormat.ColorSize = value;
+                break;
+            case kCGLPFAAlphaSize:
+                pixelFormat.AlphaSize = value;
+                break;
+            case kCGLPFADepthSize:
+                pixelFormat.DepthSize = value;
+                break;
+            case kCGLPFAStencilSize:
+                pixelFormat.StencilSize = value;
+                break;
+            case kCGLPFASampleBuffers:
+                pixelFormat.SampleBuffers = value;
+                break;
+            case kCGLPFASamples:
+                pixelFormat.Samples = value;
+                break;
+            case kCGLPFAOpenGLProfile:
+                pixelFormat.Profile = value;
+                break;
+            case kCGLPFARendererID:
+                pixelFormat.RendererId = value;
+                break;
+            default:
+                break;
+            }
+        }
+
+        Bool InitEGLContext(ContextObject& object, CGLPixelFormatObj pix, CGLContextObj share) {
+            auto* pixelFormat = [&]() -> PixelFormatObject* {
+                auto& pixelFormats = PixelFormats();
+                auto it = pixelFormats.find(pix);
+                return it == pixelFormats.end() ? nullptr : &it->second;
+            }();
+            if (!pixelFormat) {
+                return false;
+            }
+
+            EGLDisplay display = EGLImpl::GetDisplay(EGL_DEFAULT_DISPLAY);
+            if (display == EGL_NO_DISPLAY) {
+                return false;
+            }
+            if (!EGLImpl::Initialize(display, nullptr, nullptr)) {
+                return false;
+            }
+            EGLImpl::BindAPI(EGL_OPENGL_API);
+
+            const EGLint attribs[] = {
+                EGL_RED_SIZE, 8,
+                EGL_GREEN_SIZE, 8,
+                EGL_BLUE_SIZE, 8,
+                EGL_ALPHA_SIZE, std::max(pixelFormat->AlphaSize, 0),
+                EGL_DEPTH_SIZE, std::max(pixelFormat->DepthSize, 0),
+                EGL_STENCIL_SIZE, std::max(pixelFormat->StencilSize, 0),
+                EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_PBUFFER_BIT,
+                EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
+                EGL_NONE,
+            };
+
+            EGLConfig config = nullptr;
+            EGLint count = 0;
+            if (!EGLImpl::ChooseConfig(display, attribs, &config, 1, &count) || count <= 0) {
+                return false;
+            }
+
+            EGLContext shareContext = EGL_NO_CONTEXT;
+            if (share != nullptr) {
+                auto& contexts = Contexts();
+                auto shareIt = contexts.find(share);
+                if (shareIt == contexts.end()) {
+                    return false;
+                }
+                shareContext = shareIt->second.Context;
+            }
+
+            const EGLint contextAttribs[] = {
+                EGL_CONTEXT_MAJOR_VERSION, 3,
+                EGL_CONTEXT_MINOR_VERSION, 3,
+                EGL_NONE,
+            };
+            EGLContext eglContext = EGLImpl::CreateContext(display, config, shareContext, contextAttribs);
+            if (eglContext == EGL_NO_CONTEXT) {
+                return false;
+            }
+
+            object.Display = display;
+            object.Config = config;
+            object.Context = eglContext;
+            object.PixelFormat = pix;
+            object.Share = share;
+            return true;
+        }
+
+        ContextObject* TryGetContext(CGLContextObj ctx) {
+            auto& contexts = Contexts();
+            auto it = contexts.find(ctx);
+            return it == contexts.end() ? nullptr : &it->second;
+        }
+
+        const ContextObject* TryGetContext(CGLContextObj ctx, const std::lock_guard<std::recursive_mutex>&) {
+            auto& contexts = Contexts();
+            auto it = contexts.find(ctx);
+            return it == contexts.end() ? nullptr : &it->second;
+        }
+
+        PixelFormatObject* TryGetPixelFormat(CGLPixelFormatObj pix) {
+            auto& pixelFormats = PixelFormats();
+            auto it = pixelFormats.find(pix);
+            return it == pixelFormats.end() ? nullptr : &it->second;
+        }
+
+        CGLError MakeCurrentLocked(CGLContextObj ctx, ContextObject& object) {
+            CurrentContexts()[CurrentThreadKey()] = ctx;
+            if (!object.HasDrawable || object.Surface == EGL_NO_SURFACE) {
+                return kCGLNoError;
+            }
+            if (!EGLImpl::MakeCurrent(object.Display, object.Surface, object.Surface, object.Context)) {
+                return kCGLBadState;
+            }
+            return kCGLNoError;
+        }
+    } // namespace
+
+    CGLError ChoosePixelFormat(const CGLPixelFormatAttribute* attribs, CGLPixelFormatObj* pix, GLint* npix) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        if (!pix || !npix) {
+            return kCGLBadAddress;
+        }
+
+        PixelFormatObject object;
+        if (attribs) {
+            for (SizeT i = 0; attribs[i] != static_cast<CGLPixelFormatAttribute>(0); ++i) {
+                const auto attrib = attribs[i];
+                GLint value = 1;
+                if (AttributeHasValue(attrib)) {
+                    value = static_cast<GLint>(attribs[++i]);
+                }
+                ApplyPixelFormatAttribute(object, attrib, value);
+            }
+        }
+
+        const auto handle = EncodePixelFormat(NextPixelFormatHandle()++);
+        PixelFormats()[handle] = object;
+        *pix = handle;
+        *npix = 1;
+        return kCGLNoError;
+    }
+
+    CGLError DestroyPixelFormat(CGLPixelFormatObj pix) {
+        ReleasePixelFormat(pix);
+        return kCGLNoError;
+    }
+
+    CGLError DescribePixelFormat(CGLPixelFormatObj pix, GLint pixNum, CGLPixelFormatAttribute attrib, GLint* value) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        if (!value) {
+            return kCGLBadAddress;
+        }
+        if (pixNum != 0 && pixNum != 1) {
+            return kCGLBadValue;
+        }
+        auto* pixelFormat = TryGetPixelFormat(pix);
+        if (!pixelFormat) {
+            return kCGLBadPixelFormat;
+        }
+
+        switch (attrib) {
+        case kCGLPFADoubleBuffer:
+            *value = pixelFormat->DoubleBuffer ? 1 : 0;
+            return kCGLNoError;
+        case kCGLPFAAccelerated:
+        case kCGLPFAAcceleratedCompute:
+        case kCGLPFASupportsAutomaticGraphicsSwitching:
+            *value = 1;
+            return kCGLNoError;
+        case kCGLPFAColorSize:
+            *value = pixelFormat->ColorSize;
+            return kCGLNoError;
+        case kCGLPFAAlphaSize:
+            *value = pixelFormat->AlphaSize;
+            return kCGLNoError;
+        case kCGLPFADepthSize:
+            *value = pixelFormat->DepthSize;
+            return kCGLNoError;
+        case kCGLPFAStencilSize:
+            *value = pixelFormat->StencilSize;
+            return kCGLNoError;
+        case kCGLPFASampleBuffers:
+            *value = pixelFormat->SampleBuffers;
+            return kCGLNoError;
+        case kCGLPFASamples:
+            *value = pixelFormat->Samples;
+            return kCGLNoError;
+        case kCGLPFARendererID:
+            *value = pixelFormat->RendererId;
+            return kCGLNoError;
+        case kCGLPFAOpenGLProfile:
+            *value = pixelFormat->Profile;
+            return kCGLNoError;
+        case kCGLPFAVirtualScreenCount:
+            *value = 1;
+            return kCGLNoError;
+        default:
+            *value = 0;
+            return kCGLNoError;
+        }
+    }
+
+    void ReleasePixelFormat(CGLPixelFormatObj pix) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* pixelFormat = TryGetPixelFormat(pix);
+        if (!pixelFormat) {
+            return;
+        }
+        if (pixelFormat->RetainCount > 1) {
+            --pixelFormat->RetainCount;
+            return;
+        }
+        PixelFormats().erase(pix);
+    }
+
+    CGLPixelFormatObj RetainPixelFormat(CGLPixelFormatObj pix) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* pixelFormat = TryGetPixelFormat(pix);
+        if (pixelFormat) {
+            ++pixelFormat->RetainCount;
+        }
+        return pix;
+    }
+
+    GLuint GetPixelFormatRetainCount(CGLPixelFormatObj pix) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* pixelFormat = TryGetPixelFormat(pix);
+        return pixelFormat ? pixelFormat->RetainCount : 0;
+    }
+
+    CGLError CreateContext(CGLPixelFormatObj pix, CGLContextObj share, CGLContextObj* ctx) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        if (!ctx) {
+            return kCGLBadAddress;
+        }
+        if (!TryGetPixelFormat(pix)) {
+            return kCGLBadPixelFormat;
+        }
+        if (share && !TryGetContext(share)) {
+            return kCGLBadMatch;
+        }
+
+        ContextObject object;
+        if (!InitEGLContext(object, pix, share)) {
+            return kCGLBadAlloc;
+        }
+        RetainPixelFormat(pix);
+        const auto handle = EncodeContext(NextContextHandle()++);
+        Contexts()[handle] = object;
+        *ctx = handle;
+        return kCGLNoError;
+    }
+
+    CGLError DestroyContext(CGLContextObj ctx) {
+        ReleaseContext(ctx);
+        return kCGLNoError;
+    }
+
+    CGLContextObj RetainContext(CGLContextObj ctx) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* object = TryGetContext(ctx);
+        if (object) {
+            ++object->RetainCount;
+        }
+        return ctx;
+    }
+
+    void ReleaseContext(CGLContextObj ctx) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* object = TryGetContext(ctx);
+        if (!object) {
+            return;
+        }
+        if (object->RetainCount > 1) {
+            --object->RetainCount;
+            return;
+        }
+        if (object->Surface != EGL_NO_SURFACE) {
+            EGLImpl::DestroySurface(object->Display, object->Surface);
+        }
+        if (object->Context != EGL_NO_CONTEXT) {
+            EGLImpl::DestroyContext(object->Display, object->Context);
+        }
+        ReleasePixelFormat(object->PixelFormat);
+        auto& currentContexts = CurrentContexts();
+        for (auto it = currentContexts.begin(); it != currentContexts.end();) {
+            if (it->second == ctx) {
+                it = currentContexts.erase(it);
+            } else {
+                ++it;
+            }
+        }
+        Contexts().erase(ctx);
+    }
+
+    GLuint GetContextRetainCount(CGLContextObj ctx) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* object = TryGetContext(ctx);
+        return object ? object->RetainCount : 0;
+    }
+
+    CGLPixelFormatObj GetPixelFormat(CGLContextObj ctx) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* object = TryGetContext(ctx);
+        return object ? object->PixelFormat : nullptr;
+    }
+
+    CGLError SetCurrentContext(CGLContextObj ctx) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        if (!ctx) {
+            CurrentContexts().erase(CurrentThreadKey());
+            EGLImpl::MakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+            return kCGLNoError;
+        }
+        auto* object = TryGetContext(ctx);
+        if (!object) {
+            return kCGLBadContext;
+        }
+        return MakeCurrentLocked(ctx, *object);
+    }
+
+    CGLContextObj GetCurrentContext() {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto& currentContexts = CurrentContexts();
+        auto it = currentContexts.find(CurrentThreadKey());
+        return it == currentContexts.end() ? nullptr : it->second;
+    }
+
+    CGLError SetParameter(CGLContextObj ctx, CGLContextParameter pname, const GLint* params) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* object = TryGetContext(ctx);
+        if (!object) {
+            return kCGLBadContext;
+        }
+        if (!params && pname != kCGLCPReclaimResources) {
+            return kCGLBadAddress;
+        }
+        switch (pname) {
+        case kCGLCPSwapInterval:
+            object->SwapInterval = params[0];
+            EGLImpl::SwapInterval(object->Display, object->SwapInterval);
+            return kCGLNoError;
+        case kCGLCPSurfaceBackingSize:
+            object->SurfaceBackingSize[0] = params[0];
+            object->SurfaceBackingSize[1] = params[1];
+            return kCGLNoError;
+        case kCGLCPSurfaceOpacity:
+        case kCGLCPSurfaceOrder:
+        case kCGLCPMPSwapsInFlight:
+        case kCGLCPReclaimResources:
+            return kCGLNoError;
+        default:
+            return kCGLNoError;
+        }
+    }
+
+    CGLError GetParameter(CGLContextObj ctx, CGLContextParameter pname, GLint* params) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* object = TryGetContext(ctx);
+        if (!object) {
+            return kCGLBadContext;
+        }
+        if (!params) {
+            return kCGLBadAddress;
+        }
+        switch (pname) {
+        case kCGLCPSwapInterval:
+            params[0] = object->SwapInterval;
+            return kCGLNoError;
+        case kCGLCPSurfaceBackingSize:
+            params[0] = object->SurfaceBackingSize[0];
+            params[1] = object->SurfaceBackingSize[1];
+            return kCGLNoError;
+        case kCGLCPCurrentRendererID:
+            params[0] = 0x4d474c;
+            return kCGLNoError;
+        case kCGLCPGPUVertexProcessing:
+        case kCGLCPGPUFragmentProcessing:
+        case kCGLCPHasDrawable:
+            params[0] = object->HasDrawable ? 1 : 0;
+            return kCGLNoError;
+        case kCGLCPMPSwapsInFlight:
+            params[0] = 1;
+            return kCGLNoError;
+        default:
+            params[0] = 0;
+            return kCGLNoError;
+        }
+    }
+
+    CGLError UpdateContext(CGLContextObj ctx) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        return TryGetContext(ctx) ? kCGLNoError : kCGLBadContext;
+    }
+
+    CGLError ClearDrawable(CGLContextObj ctx) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* object = TryGetContext(ctx);
+        if (!object) {
+            return kCGLBadContext;
+        }
+        if (object->Surface != EGL_NO_SURFACE) {
+            EGLImpl::DestroySurface(object->Display, object->Surface);
+        }
+        object->Surface = EGL_NO_SURFACE;
+        object->View = nullptr;
+        object->MetalLayer = nullptr;
+        object->HasDrawable = false;
+        return kCGLNoError;
+    }
+
+    CGLError FlushDrawable(CGLContextObj ctx) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* object = TryGetContext(ctx);
+        if (!object) {
+            return kCGLBadContext;
+        }
+        if (!object->HasDrawable || object->Surface == EGL_NO_SURFACE) {
+            return kCGLBadDrawable;
+        }
+        const auto currentError = MakeCurrentLocked(ctx, *object);
+        if (currentError != kCGLNoError) {
+            return currentError;
+        }
+        return EGLImpl::SwapBuffers(object->Display, object->Surface) ? kCGLNoError : kCGLBadDrawable;
+    }
+
+    CGLError LockContext(CGLContextObj ctx) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* object = TryGetContext(ctx);
+        if (!object) {
+            return kCGLBadContext;
+        }
+        object->Locked = true;
+        return kCGLNoError;
+    }
+
+    CGLError UnlockContext(CGLContextObj ctx) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* object = TryGetContext(ctx);
+        if (!object) {
+            return kCGLBadContext;
+        }
+        object->Locked = false;
+        return kCGLNoError;
+    }
+
+    void GetVersion(GLint* majorvers, GLint* minorvers) {
+        if (majorvers) {
+            *majorvers = 1;
+        }
+        if (minorvers) {
+            *minorvers = 0;
+        }
+    }
+
+    const char* ErrorString(CGLError error) {
+        switch (error) {
+        case kCGLNoError:
+            return "no error";
+        case kCGLBadAttribute:
+            return "invalid pixel format attribute";
+        case kCGLBadPixelFormat:
+            return "invalid pixel format";
+        case kCGLBadContext:
+            return "invalid context";
+        case kCGLBadDrawable:
+            return "invalid drawable";
+        case kCGLBadState:
+            return "invalid context state";
+        case kCGLBadValue:
+            return "invalid numerical value";
+        case kCGLBadMatch:
+            return "invalid share context";
+        case kCGLBadAddress:
+            return "invalid pointer";
+        case kCGLBadAlloc:
+            return "invalid memory allocation";
+        default:
+            return "unknown CGL error";
+        }
+    }
+
+    CGLError AttachDrawable(CGLContextObj ctx, void* nsView, void* metalLayer) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* object = TryGetContext(ctx);
+        if (!object) {
+            return kCGLBadContext;
+        }
+        if (!metalLayer) {
+            return kCGLBadDrawable;
+        }
+        if (object->Surface != EGL_NO_SURFACE && object->MetalLayer == metalLayer) {
+            object->View = nsView;
+            object->HasDrawable = true;
+            return kCGLNoError;
+        }
+        if (object->Surface != EGL_NO_SURFACE) {
+            EGLImpl::DestroySurface(object->Display, object->Surface);
+            object->Surface = EGL_NO_SURFACE;
+        }
+        EGLSurface surface = EGLImpl::CreatePlatformWindowSurface(object->Display, object->Config, metalLayer, nullptr);
+        if (surface == EGL_NO_SURFACE) {
+            return kCGLBadDrawable;
+        }
+        object->Surface = surface;
+        object->View = nsView;
+        object->MetalLayer = metalLayer;
+        object->HasDrawable = true;
+        if (GetCurrentContext() == ctx) {
+            return MakeCurrentLocked(ctx, *object);
+        }
+        return kCGLNoError;
+    }
+
+    void* GetContextNSObject(CGLContextObj ctx) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* object = TryGetContext(ctx);
+        return object ? object->NSObject : nullptr;
+    }
+
+    void SetContextNSObject(CGLContextObj ctx, void* nsObject) {
+        const std::lock_guard<std::recursive_mutex> lock(RegistryMutex());
+        auto* object = TryGetContext(ctx);
+        if (object) {
+            object->NSObject = nsObject;
+        }
+    }
+} // namespace MobileGL::MG_Impl::CGLImpl
+#endif

MobileGL/MG_Impl/CGLImpl/CGLImpl.h

@@ -0,0 +1,49 @@
+// MobileGL - MobileGL/MG_Impl/CGLImpl/CGLImpl.h
+// Copyright (c) 2025-2026 MobileGL-Dev
+// Licensed under the GNU Lesser General Public License v3.0:
+//   https://www.gnu.org/licenses/gpl-3.0.txt
+//   https://www.gnu.org/licenses/lgpl-3.0.txt
+// SPDX-License-Identifier: LGPL-3.0-only
+// End of Source File Header
+
+#pragma once
+#include <Includes.h>
+
+#if defined(__APPLE__)
+#ifndef GL_SILENCE_DEPRECATION
+#define GL_SILENCE_DEPRECATION
+#endif
+#include <OpenGL/OpenGL.h>
+
+namespace MobileGL::MG_Impl::CGLImpl {
+    CGLError ChoosePixelFormat(const CGLPixelFormatAttribute* attribs, CGLPixelFormatObj* pix, GLint* npix);
+    CGLError DestroyPixelFormat(CGLPixelFormatObj pix);
+    CGLError DescribePixelFormat(CGLPixelFormatObj pix, GLint pixNum, CGLPixelFormatAttribute attrib, GLint* value);
+    void ReleasePixelFormat(CGLPixelFormatObj pix);
+    CGLPixelFormatObj RetainPixelFormat(CGLPixelFormatObj pix);
+    GLuint GetPixelFormatRetainCount(CGLPixelFormatObj pix);
+
+    CGLError CreateContext(CGLPixelFormatObj pix, CGLContextObj share, CGLContextObj* ctx);
+    CGLError DestroyContext(CGLContextObj ctx);
+    CGLContextObj RetainContext(CGLContextObj ctx);
+    void ReleaseContext(CGLContextObj ctx);
+    GLuint GetContextRetainCount(CGLContextObj ctx);
+    CGLPixelFormatObj GetPixelFormat(CGLContextObj ctx);
+
+    CGLError SetCurrentContext(CGLContextObj ctx);
+    CGLContextObj GetCurrentContext();
+    CGLError SetParameter(CGLContextObj ctx, CGLContextParameter pname, const GLint* params);
+    CGLError GetParameter(CGLContextObj ctx, CGLContextParameter pname, GLint* params);
+    CGLError UpdateContext(CGLContextObj ctx);
+    CGLError ClearDrawable(CGLContextObj ctx);
+    CGLError FlushDrawable(CGLContextObj ctx);
+    CGLError LockContext(CGLContextObj ctx);
+    CGLError UnlockContext(CGLContextObj ctx);
+    void GetVersion(GLint* majorvers, GLint* minorvers);
+    const char* ErrorString(CGLError error);
+
+    CGLError AttachDrawable(CGLContextObj ctx, void* nsView, void* metalLayer);
+    void* GetContextNSObject(CGLContextObj ctx);
+    void SetContextNSObject(CGLContextObj ctx, void* nsObject);
+}
+#endif

MobileGL/MG_Impl/CGLImpl/Exporting/Definitions.cpp

@@ -0,0 +1,110 @@
+// MobileGL - MobileGL/MG_Impl/CGLImpl/Exporting/Definitions.cpp
+// Copyright (c) 2025-2026 MobileGL-Dev
+// Licensed under the GNU Lesser General Public License v3.0:
+//   https://www.gnu.org/licenses/gpl-3.0.txt
+//   https://www.gnu.org/licenses/lgpl-3.0.txt
+// SPDX-License-Identifier: LGPL-3.0-only
+// End of Source File Header
+
+#include "../CGLImpl.h"
+
+#if defined(__APPLE__)
+
+MOBILEGL_CGL_API CGLError CGLChoosePixelFormat(const CGLPixelFormatAttribute* attribs,
+                                               CGLPixelFormatObj* pix,
+                                               GLint* npix) {
+    return MobileGL::MG_Impl::CGLImpl::ChoosePixelFormat(attribs, pix, npix);
+}
+
+MOBILEGL_CGL_API CGLError CGLDestroyPixelFormat(CGLPixelFormatObj pix) {
+    return MobileGL::MG_Impl::CGLImpl::DestroyPixelFormat(pix);
+}
+
+MOBILEGL_CGL_API CGLError CGLDescribePixelFormat(CGLPixelFormatObj pix,
+                                                 GLint pix_num,
+                                                 CGLPixelFormatAttribute attrib,
+                                                 GLint* value) {
+    return MobileGL::MG_Impl::CGLImpl::DescribePixelFormat(pix, pix_num, attrib, value);
+}
+
+MOBILEGL_CGL_API void CGLReleasePixelFormat(CGLPixelFormatObj pix) {
+    MobileGL::MG_Impl::CGLImpl::ReleasePixelFormat(pix);
+}
+
+MOBILEGL_CGL_API CGLPixelFormatObj CGLRetainPixelFormat(CGLPixelFormatObj pix) {
+    return MobileGL::MG_Impl::CGLImpl::RetainPixelFormat(pix);
+}
+
+MOBILEGL_CGL_API GLuint CGLGetPixelFormatRetainCount(CGLPixelFormatObj pix) {
+    return MobileGL::MG_Impl::CGLImpl::GetPixelFormatRetainCount(pix);
+}
+
+MOBILEGL_CGL_API CGLError CGLCreateContext(CGLPixelFormatObj pix, CGLContextObj share, CGLContextObj* ctx) {
+    return MobileGL::MG_Impl::CGLImpl::CreateContext(pix, share, ctx);
+}
+
+MOBILEGL_CGL_API CGLError CGLDestroyContext(CGLContextObj ctx) {
+    return MobileGL::MG_Impl::CGLImpl::DestroyContext(ctx);
+}
+
+MOBILEGL_CGL_API CGLContextObj CGLRetainContext(CGLContextObj ctx) {
+    return MobileGL::MG_Impl::CGLImpl::RetainContext(ctx);
+}
+
+MOBILEGL_CGL_API void CGLReleaseContext(CGLContextObj ctx) {
+    MobileGL::MG_Impl::CGLImpl::ReleaseContext(ctx);
+}
+
+MOBILEGL_CGL_API GLuint CGLGetContextRetainCount(CGLContextObj ctx) {
+    return MobileGL::MG_Impl::CGLImpl::GetContextRetainCount(ctx);
+}
+
+MOBILEGL_CGL_API CGLPixelFormatObj CGLGetPixelFormat(CGLContextObj ctx) {
+    return MobileGL::MG_Impl::CGLImpl::GetPixelFormat(ctx);
+}
+
+MOBILEGL_CGL_API CGLError CGLSetCurrentContext(CGLContextObj ctx) {
+    return MobileGL::MG_Impl::CGLImpl::SetCurrentContext(ctx);
+}
+
+MOBILEGL_CGL_API CGLContextObj CGLGetCurrentContext(void) {
+    return MobileGL::MG_Impl::CGLImpl::GetCurrentContext();
+}
+
+MOBILEGL_CGL_API CGLError CGLSetParameter(CGLContextObj ctx, CGLContextParameter pname, const GLint* params) {
+    return MobileGL::MG_Impl::CGLImpl::SetParameter(ctx, pname, params);
+}
+
+MOBILEGL_CGL_API CGLError CGLGetParameter(CGLContextObj ctx, CGLContextParameter pname, GLint* params) {
+    return MobileGL::MG_Impl::CGLImpl::GetParameter(ctx, pname, params);
+}
+
+MOBILEGL_CGL_API CGLError CGLUpdateContext(CGLContextObj ctx) {
+    return MobileGL::MG_Impl::CGLImpl::UpdateContext(ctx);
+}
+
+MOBILEGL_CGL_API CGLError CGLClearDrawable(CGLContextObj ctx) {
+    return MobileGL::MG_Impl::CGLImpl::ClearDrawable(ctx);
+}
+
+MOBILEGL_CGL_API CGLError CGLFlushDrawable(CGLContextObj ctx) {
+    return MobileGL::MG_Impl::CGLImpl::FlushDrawable(ctx);
+}
+
+MOBILEGL_CGL_API CGLError CGLLockContext(CGLContextObj ctx) {
+    return MobileGL::MG_Impl::CGLImpl::LockContext(ctx);
+}
+
+MOBILEGL_CGL_API CGLError CGLUnlockContext(CGLContextObj ctx) {
+    return MobileGL::MG_Impl::CGLImpl::UnlockContext(ctx);
+}
+
+MOBILEGL_CGL_API void CGLGetVersion(GLint* majorvers, GLint* minorvers) {
+    MobileGL::MG_Impl::CGLImpl::GetVersion(majorvers, minorvers);
+}
+
+MOBILEGL_CGL_API const char* CGLErrorString(CGLError error) {
+    return MobileGL::MG_Impl::CGLImpl::ErrorString(error);
+}
+
+#endif

MobileGL/MG_Impl/DyldInterpose/DyldInterpose.cpp

@@ -0,0 +1,56 @@
+// MobileGL - MobileGL/MG_Impl/DyldInterpose/DyldInterpose.cpp
+// Copyright (c) 2025-2026 MobileGL-Dev
+// Licensed under the GNU Lesser General Public License v3.0:
+//   https://www.gnu.org/licenses/gpl-3.0.txt
+//   https://www.gnu.org/licenses/lgpl-3.0.txt
+// SPDX-License-Identifier: LGPL-3.0-only
+// End of Source File Header
+
+#include <Includes.h>
+
+#if defined(__APPLE__)
+
+#include "MG_Impl/GetProcAddress.h"
+
+#include <dlfcn.h>
+
+namespace {
+    struct DyldInterposeEntry {
+        const void* Replacement;
+        const void* Replacee;
+    };
+
+    bool IsGLProcName(const char* name) {
+        if (name == nullptr) {
+            return false;
+        }
+
+        if (strncmp(name, "CGL", 3) == 0) {
+            return true;
+        }
+
+        if (strncmp(name, "gl", 2) != 0) {
+            return false;
+        }
+
+        // Avoid stealing glfw*/glib*/glX*/global application symbols.
+        return name[2] >= 'A' && name[2] <= 'Z' && name[2] != 'X';
+    }
+
+    void* MobileGLDlsym(void* handle, const char* symbol) {
+        if (IsGLProcName(symbol)) {
+            if (void* proc = MobileGL::MG_Impl::GetProcAddress(symbol)) {
+                return proc;
+            }
+        }
+
+        return dlsym(handle, symbol);
+    }
+
+    __attribute__((used)) static const DyldInterposeEntry kMobileGLDyldInterpose[]
+        __attribute__((section("__DATA,__interpose"))) = {
+            {reinterpret_cast<const void*>(MobileGLDlsym), reinterpret_cast<const void*>(dlsym)},
+        };
+} // namespace
+
+#endif

MobileGL/MG_Impl/GetProcAddress.cpp

@@ -7,6 +7,13 @@
 // End of Source File Header
 
 #include "GetProcAddress.h"
+#if defined(__APPLE__)
+#ifndef GL_SILENCE_DEPRECATION
+#define GL_SILENCE_DEPRECATION
+#endif
+#include <OpenGL/OpenGL.h>
+#endif
+
 #define GETPROC(name, var)                                                                                             \
     if (strcmp(#name, var) == 0) {                                                                                     \
         return (void*)name;                                                                                            \
@@ -60,6 +67,32 @@ namespace MobileGL::MG_Impl {
         GETPROC(eglCreatePlatformPixmapSurface, name);
         GETPROC(eglWaitSync, name);
 
+#if defined(__APPLE__)
+        GETPROC(CGLChoosePixelFormat, name);
+        GETPROC(CGLDestroyPixelFormat, name);
+        GETPROC(CGLDescribePixelFormat, name);
+        GETPROC(CGLReleasePixelFormat, name);
+        GETPROC(CGLRetainPixelFormat, name);
+        GETPROC(CGLGetPixelFormatRetainCount, name);
+        GETPROC(CGLCreateContext, name);
+        GETPROC(CGLDestroyContext, name);
+        GETPROC(CGLRetainContext, name);
+        GETPROC(CGLReleaseContext, name);
+        GETPROC(CGLGetContextRetainCount, name);
+        GETPROC(CGLGetPixelFormat, name);
+        GETPROC(CGLSetCurrentContext, name);
+        GETPROC(CGLGetCurrentContext, name);
+        GETPROC(CGLSetParameter, name);
+        GETPROC(CGLGetParameter, name);
+        GETPROC(CGLUpdateContext, name);
+        GETPROC(CGLClearDrawable, name);
+        GETPROC(CGLFlushDrawable, name);
+        GETPROC(CGLLockContext, name);
+        GETPROC(CGLUnlockContext, name);
+        GETPROC(CGLGetVersion, name);
+        GETPROC(CGLErrorString, name);
+#endif
+
         GETPROC(glCullFace, name);
         GETPROC(glFrontFace, name);
         GETPROC(glHint, name);

MobileGL/MG_Impl/Init.cpp

@@ -10,6 +10,9 @@
 
 #include "GLImpl/Texture/ProxyTexture.h"
 #include "GLImpl/Framebuffer/GL_Framebuffer.h"
+#if defined(__APPLE__)
+#include "NSOpenGLImpl/NSOpenGLImpl.h"
+#endif
 
 #include <MG_State/GLState/TextureState/TextureObject1D.h>
 #include <MG_State/GLState/TextureState/TextureObject2D.h>
@@ -45,5 +48,8 @@ namespace MobileGL::MG_Impl {
             MakeUnique<GLImpl::FramebufferImpl::DefaultFramebufferInfo>(fbo0, colorTex, depthTex, stencilTex);
         MG_State::pGLContext->GetFramebufferBindingSlot(FramebufferTarget::Draw).Bind(fbo0);
         MG_State::pGLContext->GetFramebufferBindingSlot(FramebufferTarget::Read).Bind(fbo0);
+#if defined(__APPLE__)
+        NSOpenGLImpl::InstallHooks();
+#endif
     }
 } // namespace MobileGL::MG_Impl

MobileGL/MG_Impl/NSOpenGLImpl/NSOpenGLImpl.cpp

@@ -0,0 +1,436 @@
+// MobileGL - MobileGL/MG_Impl/NSOpenGLImpl/NSOpenGLImpl.cpp
+// Copyright (c) 2025-2026 MobileGL-Dev
+// Licensed under the GNU Lesser General Public License v3.0:
+//   https://www.gnu.org/licenses/gpl-3.0.txt
+//   https://www.gnu.org/licenses/lgpl-3.0.txt
+// SPDX-License-Identifier: LGPL-3.0-only
+// End of Source File Header
+
+#include "NSOpenGLImpl.h"
+
+#if defined(__APPLE__)
+#ifndef GL_SILENCE_DEPRECATION
+#define GL_SILENCE_DEPRECATION
+#endif
+#include "../CGLImpl/CGLImpl.h"
+#include <CoreGraphics/CoreGraphics.h>
+#include <objc/message.h>
+#include <objc/objc.h>
+#include <objc/runtime.h>
+
+namespace MobileGL::MG_Impl::NSOpenGLImpl {
+    namespace {
+        constexpr intptr_t kAssociationRetain = 1;
+        constexpr intptr_t kAssociationAssign = 0;
+
+        char kPixelFormatHandleKey;
+        char kContextHandleKey;
+        char kContextPixelFormatObjectKey;
+        char kContextViewKey;
+        char kContextLayerKey;
+
+        std::once_flag g_installOnce;
+        IMP g_pixelFormatDealloc = nullptr;
+        IMP g_contextDealloc = nullptr;
+
+        template <typename Fn>
+        Fn ObjcMsgSend() {
+            return reinterpret_cast<Fn>(objc_msgSend);
+        }
+
+        id SendId(id receiver, const char* selector) {
+            return receiver ? ObjcMsgSend<id (*)(id, SEL)>()(receiver, sel_registerName(selector)) : nil;
+        }
+
+        void SendVoid(id receiver, const char* selector) {
+            if (receiver) {
+                ObjcMsgSend<void (*)(id, SEL)>()(receiver, sel_registerName(selector));
+            }
+        }
+
+        void SendVoidBool(id receiver, const char* selector, bool value) {
+            if (receiver) {
+                ObjcMsgSend<void (*)(id, SEL, bool)>()(receiver, sel_registerName(selector), value);
+            }
+        }
+
+        void SendVoidId(id receiver, const char* selector, id value) {
+            if (receiver) {
+                ObjcMsgSend<void (*)(id, SEL, id)>()(receiver, sel_registerName(selector), value);
+            }
+        }
+
+        id SendIdCGLPixelFormat(id receiver, const char* selector, CGLPixelFormatObj value) {
+            return receiver ? ObjcMsgSend<id (*)(id, SEL, CGLPixelFormatObj)>()(receiver, sel_registerName(selector), value)
+                            : nil;
+        }
+
+        void SendVoidCGRect(id receiver, const char* selector, CGRect value) {
+            if (receiver) {
+                ObjcMsgSend<void (*)(id, SEL, CGRect)>()(receiver, sel_registerName(selector), value);
+            }
+        }
+
+        void SendVoidCGSize(id receiver, const char* selector, CGSize value) {
+            if (receiver) {
+                ObjcMsgSend<void (*)(id, SEL, CGSize)>()(receiver, sel_registerName(selector), value);
+            }
+        }
+
+        bool SendBool(id receiver, const char* selector) {
+            return receiver ? ObjcMsgSend<bool (*)(id, SEL)>()(receiver, sel_registerName(selector)) : false;
+        }
+
+        CGRect SendCGRect(id receiver, const char* selector) {
+            if (!receiver) {
+                return {};
+            }
+            return ObjcMsgSend<CGRect (*)(id, SEL)>()(receiver, sel_registerName(selector));
+        }
+
+        CGFloat SendCGFloat(id receiver, const char* selector) {
+            return receiver ? ObjcMsgSend<CGFloat (*)(id, SEL)>()(receiver, sel_registerName(selector)) : 1.0;
+        }
+
+        void SetAssoc(id object, const void* key, id value, intptr_t policy) {
+            objc_setAssociatedObject(object, key, value, static_cast<objc_AssociationPolicy>(policy));
+        }
+
+        id GetAssoc(id object, const void* key) {
+            return object ? objc_getAssociatedObject(object, key) : nil;
+        }
+
+        CGLPixelFormatObj GetPixelFormatHandle(id object) {
+            return reinterpret_cast<CGLPixelFormatObj>(GetAssoc(object, &kPixelFormatHandleKey));
+        }
+
+        void SetPixelFormatHandle(id object, CGLPixelFormatObj handle) {
+            SetAssoc(object, &kPixelFormatHandleKey, reinterpret_cast<id>(handle), kAssociationAssign);
+        }
+
+        CGLContextObj GetContextHandle(id object) {
+            return reinterpret_cast<CGLContextObj>(GetAssoc(object, &kContextHandleKey));
+        }
+
+        void SetContextHandle(id object, CGLContextObj handle) {
+            SetAssoc(object, &kContextHandleKey, reinterpret_cast<id>(handle), kAssociationAssign);
+        }
+
+        id PixelFormatInitWithAttributes(id self, SEL, const CGLPixelFormatAttribute* attribs) {
+            CGLPixelFormatObj pixelFormat = nullptr;
+            GLint count = 0;
+            if (CGLImpl::ChoosePixelFormat(attribs, &pixelFormat, &count) != kCGLNoError) {
+                return nil;
+            }
+            SetPixelFormatHandle(self, pixelFormat);
+            return self;
+        }
+
+        id PixelFormatInitWithCGLPixelFormatObj(id self, SEL, CGLPixelFormatObj format) {
+            if (!format) {
+                return nil;
+            }
+            SetPixelFormatHandle(self, CGLImpl::RetainPixelFormat(format));
+            return self;
+        }
+
+        void PixelFormatGetValues(id self, SEL, GLint* vals, CGLPixelFormatAttribute attrib, GLint screen) {
+            (void)screen;
+            if (!vals) {
+                return;
+            }
+            GLint value = 0;
+            if (CGLImpl::DescribePixelFormat(GetPixelFormatHandle(self), 0, attrib, &value) == kCGLNoError) {
+                *vals = value;
+            }
+        }
+
+        GLint PixelFormatNumberOfVirtualScreens(id, SEL) {
+            return 1;
+        }
+
+        CGLPixelFormatObj PixelFormatCGLPixelFormatObj(id self, SEL) {
+            return GetPixelFormatHandle(self);
+        }
+
+        void PixelFormatDealloc(id self, SEL selector) {
+            if (auto format = GetPixelFormatHandle(self)) {
+                CGLImpl::ReleasePixelFormat(format);
+                SetPixelFormatHandle(self, nullptr);
+            }
+            if (g_pixelFormatDealloc) {
+                reinterpret_cast<void (*)(id, SEL)>(g_pixelFormatDealloc)(self, selector);
+            }
+        }
+
+        id ContextInitWithFormatShare(id self, SEL, id format, id share) {
+            auto pixelFormat = GetPixelFormatHandle(format);
+            if (!pixelFormat) {
+                return nil;
+            }
+            auto shareContext = GetContextHandle(share);
+            CGLContextObj context = nullptr;
+            if (CGLImpl::CreateContext(pixelFormat, shareContext, &context) != kCGLNoError) {
+                return nil;
+            }
+            CGLImpl::SetContextNSObject(context, self);
+            SetContextHandle(self, context);
+            SetAssoc(self, &kContextPixelFormatObjectKey, format, kAssociationRetain);
+            SetAssoc(self, &kContextViewKey, nil, kAssociationAssign);
+            SetAssoc(self, &kContextLayerKey, nil, kAssociationRetain);
+            return self;
+        }
+
+        id ContextInitWithCGLContextObj(id self, SEL, CGLContextObj context) {
+            if (!context) {
+                return nil;
+            }
+            CGLImpl::RetainContext(context);
+            CGLImpl::SetContextNSObject(context, self);
+            SetContextHandle(self, context);
+            if (auto pixelFormat = CGLImpl::GetPixelFormat(context)) {
+                id pixelFormatClass = reinterpret_cast<id>(objc_getClass("NSOpenGLPixelFormat"));
+                id allocated = SendId(pixelFormatClass, "alloc");
+                id pixelFormatObject = SendIdCGLPixelFormat(allocated, "initWithCGLPixelFormatObj:", pixelFormat);
+                SetAssoc(self, &kContextPixelFormatObjectKey, pixelFormatObject, kAssociationRetain);
+                SendVoid(pixelFormatObject, "release");
+            }
+            SetAssoc(self, &kContextViewKey, nil, kAssociationAssign);
+            SetAssoc(self, &kContextLayerKey, nil, kAssociationRetain);
+            return self;
+        }
+
+        id CreateMetalLayerForView(id view) {
+            if (!view) {
+                return nil;
+            }
+            id metalLayerClass = reinterpret_cast<id>(objc_getClass("CAMetalLayer"));
+            if (!metalLayerClass) {
+                MGLOG_E("NSOpenGLImpl: CAMetalLayer class not found");
+                return nil;
+            }
+
+            SendVoidBool(view, "setWantsLayer:", true);
+            id layer = SendId(metalLayerClass, "layer");
+            if (!layer) {
+                return nil;
+            }
+
+            CGRect bounds = SendCGRect(view, "bounds");
+            if (bounds.size.width <= 0.0 || bounds.size.height <= 0.0) {
+                bounds.size.width = 1.0;
+                bounds.size.height = 1.0;
+            }
+            CGFloat scale = 1.0;
+            id window = SendId(view, "window");
+            if (window) {
+                scale = SendCGFloat(window, "backingScaleFactor");
+            }
+            if (scale <= 0.0) {
+                scale = 1.0;
+            }
+            CGSize drawableSize = {bounds.size.width * scale, bounds.size.height * scale};
+            SendVoidCGRect(layer, "setFrame:", bounds);
+            SendVoidCGSize(layer, "setDrawableSize:", drawableSize);
+            SendVoidId(view, "setLayer:", layer);
+            return layer;
+        }
+
+        void ContextSetView(id self, SEL, id view) {
+            auto context = GetContextHandle(self);
+            if (!context) {
+                return;
+            }
+            if (!view) {
+                CGLImpl::ClearDrawable(context);
+                SetAssoc(self, &kContextViewKey, nil, kAssociationAssign);
+                SetAssoc(self, &kContextLayerKey, nil, kAssociationRetain);
+                return;
+            }
+            id layer = CreateMetalLayerForView(view);
+            if (!layer) {
+                return;
+            }
+            SetAssoc(self, &kContextViewKey, view, kAssociationAssign);
+            SetAssoc(self, &kContextLayerKey, layer, kAssociationRetain);
+            const auto error = CGLImpl::AttachDrawable(context, view, layer);
+            if (error != kCGLNoError) {
+                MGLOG_E("NSOpenGLImpl: failed to attach drawable: %s", CGLImpl::ErrorString(error));
+            }
+        }
+
+        id ContextView(id self, SEL) {
+            return GetAssoc(self, &kContextViewKey);
+        }
+
+        void ContextMakeCurrent(id self, SEL) {
+            auto context = GetContextHandle(self);
+            if (!context) {
+                return;
+            }
+            const auto error = CGLImpl::SetCurrentContext(context);
+            if (error != kCGLNoError) {
+                MGLOG_E("NSOpenGLImpl: makeCurrentContext failed: %s", CGLImpl::ErrorString(error));
+            }
+        }
+
+        void ContextClearCurrent(id, SEL) {
+            CGLImpl::SetCurrentContext(nullptr);
+        }
+
+        id ContextCurrentContext(id, SEL) {
+            auto context = CGLImpl::GetCurrentContext();
+            return reinterpret_cast<id>(CGLImpl::GetContextNSObject(context));
+        }
+
+        void ContextFlushBuffer(id self, SEL) {
+            auto context = GetContextHandle(self);
+            if (!context) {
+                return;
+            }
+            const auto error = CGLImpl::FlushDrawable(context);
+            if (error != kCGLNoError) {
+                MGLOG_E("NSOpenGLImpl: flushBuffer failed: %s", CGLImpl::ErrorString(error));
+            }
+        }
+
+        void ContextClearDrawable(id self, SEL) {
+            auto context = GetContextHandle(self);
+            if (context) {
+                CGLImpl::ClearDrawable(context);
+            }
+        }
+
+        void ContextUpdate(id self, SEL) {
+            auto context = GetContextHandle(self);
+            if (!context) {
+                return;
+            }
+            id view = GetAssoc(self, &kContextViewKey);
+            if (!view) {
+                CGLImpl::UpdateContext(context);
+                return;
+            }
+            id layer = GetAssoc(self, &kContextLayerKey);
+            if (!layer) {
+                ContextSetView(self, nullptr, view);
+                return;
+            }
+            CGRect bounds = SendCGRect(view, "bounds");
+            CGFloat scale = 1.0;
+            if (id window = SendId(view, "window")) {
+                scale = SendCGFloat(window, "backingScaleFactor");
+            }
+            if (scale <= 0.0) {
+                scale = 1.0;
+            }
+            SendVoidCGRect(layer, "setFrame:", bounds);
+            SendVoidCGSize(layer, "setDrawableSize:", {bounds.size.width * scale, bounds.size.height * scale});
+            CGLImpl::UpdateContext(context);
+        }
+
+        void ContextSetValues(id self, SEL, const GLint* values, long parameter) {
+            auto context = GetContextHandle(self);
+            if (context) {
+                CGLImpl::SetParameter(context, static_cast<CGLContextParameter>(parameter), values);
+            }
+        }
+
+        void ContextGetValues(id self, SEL, GLint* values, long parameter) {
+            auto context = GetContextHandle(self);
+            if (context) {
+                CGLImpl::GetParameter(context, static_cast<CGLContextParameter>(parameter), values);
+            }
+        }
+
+        CGLContextObj ContextCGLContextObj(id self, SEL) {
+            return GetContextHandle(self);
+        }
+
+        id ContextPixelFormat(id self, SEL) {
+            return GetAssoc(self, &kContextPixelFormatObjectKey);
+        }
+
+        void ContextDealloc(id self, SEL selector) {
+            SetAssoc(self, &kContextPixelFormatObjectKey, nil, kAssociationRetain);
+            if (auto context = GetContextHandle(self)) {
+                CGLImpl::SetContextNSObject(context, nullptr);
+                CGLImpl::ReleaseContext(context);
+                SetContextHandle(self, nullptr);
+            }
+            if (g_contextDealloc) {
+                reinterpret_cast<void (*)(id, SEL)>(g_contextDealloc)(self, selector);
+            }
+        }
+
+        void ReplaceInstanceMethod(Class cls, const char* selectorName, IMP replacement, IMP* original = nullptr) {
+            SEL selector = sel_registerName(selectorName);
+            Method method = class_getInstanceMethod(cls, selector);
+            if (!method) {
+                MGLOG_W("NSOpenGLImpl: missing instance method %s", selectorName);
+                return;
+            }
+            if (original) {
+                *original = method_getImplementation(method);
+            }
+            method_setImplementation(method, replacement);
+        }
+
+        void ReplaceClassMethod(Class cls, const char* selectorName, IMP replacement) {
+            SEL selector = sel_registerName(selectorName);
+            Method method = class_getClassMethod(cls, selector);
+            if (!method) {
+                MGLOG_W("NSOpenGLImpl: missing class method %s", selectorName);
+                return;
+            }
+            method_setImplementation(method, replacement);
+        }
+
+        void InstallHooksOnce() {
+            Class pixelFormatClass = objc_getClass("NSOpenGLPixelFormat");
+            Class contextClass = objc_getClass("NSOpenGLContext");
+            if (!pixelFormatClass || !contextClass) {
+                MGLOG_W("NSOpenGLImpl: NSOpenGL classes are not loaded; hooks not installed");
+                return;
+            }
+
+            ReplaceInstanceMethod(pixelFormatClass, "initWithAttributes:",
+                                  reinterpret_cast<IMP>(PixelFormatInitWithAttributes));
+            ReplaceInstanceMethod(pixelFormatClass, "initWithCGLPixelFormatObj:",
+                                  reinterpret_cast<IMP>(PixelFormatInitWithCGLPixelFormatObj));
+            ReplaceInstanceMethod(pixelFormatClass, "getValues:forAttribute:forVirtualScreen:",
+                                  reinterpret_cast<IMP>(PixelFormatGetValues));
+            ReplaceInstanceMethod(pixelFormatClass, "numberOfVirtualScreens",
+                                  reinterpret_cast<IMP>(PixelFormatNumberOfVirtualScreens));
+            ReplaceInstanceMethod(pixelFormatClass, "CGLPixelFormatObj",
+                                  reinterpret_cast<IMP>(PixelFormatCGLPixelFormatObj));
+            ReplaceInstanceMethod(pixelFormatClass, "dealloc", reinterpret_cast<IMP>(PixelFormatDealloc),
+                                  &g_pixelFormatDealloc);
+
+            ReplaceInstanceMethod(contextClass, "initWithFormat:shareContext:",
+                                  reinterpret_cast<IMP>(ContextInitWithFormatShare));
+            ReplaceInstanceMethod(contextClass, "initWithCGLContextObj:",
+                                  reinterpret_cast<IMP>(ContextInitWithCGLContextObj));
+            ReplaceInstanceMethod(contextClass, "setView:", reinterpret_cast<IMP>(ContextSetView));
+            ReplaceInstanceMethod(contextClass, "view", reinterpret_cast<IMP>(ContextView));
+            ReplaceInstanceMethod(contextClass, "makeCurrentContext", reinterpret_cast<IMP>(ContextMakeCurrent));
+            ReplaceClassMethod(contextClass, "clearCurrentContext", reinterpret_cast<IMP>(ContextClearCurrent));
+            ReplaceClassMethod(contextClass, "currentContext", reinterpret_cast<IMP>(ContextCurrentContext));
+            ReplaceInstanceMethod(contextClass, "flushBuffer", reinterpret_cast<IMP>(ContextFlushBuffer));
+            ReplaceInstanceMethod(contextClass, "clearDrawable", reinterpret_cast<IMP>(ContextClearDrawable));
+            ReplaceInstanceMethod(contextClass, "update", reinterpret_cast<IMP>(ContextUpdate));
+            ReplaceInstanceMethod(contextClass, "setValues:forParameter:", reinterpret_cast<IMP>(ContextSetValues));
+            ReplaceInstanceMethod(contextClass, "getValues:forParameter:", reinterpret_cast<IMP>(ContextGetValues));
+            ReplaceInstanceMethod(contextClass, "CGLContextObj", reinterpret_cast<IMP>(ContextCGLContextObj));
+            ReplaceInstanceMethod(contextClass, "pixelFormat", reinterpret_cast<IMP>(ContextPixelFormat));
+            ReplaceInstanceMethod(contextClass, "dealloc", reinterpret_cast<IMP>(ContextDealloc), &g_contextDealloc);
+
+            MGLOG_I("NSOpenGLImpl hooks installed");
+        }
+    } // namespace
+
+    void InstallHooks() {
+        std::call_once(g_installOnce, InstallHooksOnce);
+    }
+} // namespace MobileGL::MG_Impl::NSOpenGLImpl
+#endif

MobileGL/MG_Impl/NSOpenGLImpl/NSOpenGLImpl.h

@@ -0,0 +1,14 @@
+// MobileGL - MobileGL/MG_Impl/NSOpenGLImpl/NSOpenGLImpl.h
+// Copyright (c) 2025-2026 MobileGL-Dev
+// Licensed under the GNU Lesser General Public License v3.0:
+//   https://www.gnu.org/licenses/gpl-3.0.txt
+//   https://www.gnu.org/licenses/lgpl-3.0.txt
+// SPDX-License-Identifier: LGPL-3.0-only
+// End of Source File Header
+
+#pragma once
+#include <Includes.h>
+
+namespace MobileGL::MG_Impl::NSOpenGLImpl {
+    void InstallHooks();
+}

MobileGL/MG_Util/Debug/Log.cpp

@@ -11,7 +11,11 @@
 namespace MobileGL {
     namespace MG_Util::Debug {
         static FILE* s_logFile = nullptr;
-        static std::mutex s_mutex;
+
+        std::mutex& LogMutex() {
+            static auto* mutex = new std::mutex();
+            return *mutex;
+        }
 
         constexpr char* GetOSName() {
 #if defined(_WIN32)
@@ -81,7 +85,7 @@ namespace MobileGL {
         }
 
         void Log(const char* levelTag, android_LogPriority androidLogLevel, const char* fmt, ...) {
-            std::lock_guard<std::mutex> lock(s_mutex);
+            std::lock_guard<std::mutex> lock(LogMutex());
 
 #if MOBILEGL_LOG_ENABLE_STACKTRACE
             auto trace = std::stacktrace::current();