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

2026-09-08 20:28:32 +09:00 · 2026-06-28 20:33:14 +08:00
parent d61a0b6904
commit f121aeb57f
12 changed files with 1406 additions and 21 deletions
@@ -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