From ade81ab598df652e507c14ff3065d72b7116de1b Mon Sep 17 00:00:00 2001
From: Egor Yusov <egor.yusov@gmail.com>
Date: Sun, 21 Jan 2018 18:46:41 -0800
Subject: Updated OpenGL context initialization on MacOS

---
 Graphics/GraphicsEngineOpenGL/CMakeLists.txt       | 10 +++-
 .../GraphicsEngineOpenGL/include/GLContextMacOS.h  |  6 +--
 .../GraphicsEngineOpenGL/src/GLContextMacOS.cpp    | 58 ++++++----------------
 3 files changed, 24 insertions(+), 50 deletions(-)

(limited to 'Graphics/GraphicsEngineOpenGL')

diff --git a/Graphics/GraphicsEngineOpenGL/CMakeLists.txt b/Graphics/GraphicsEngineOpenGL/CMakeLists.txt
index ade8728a..5f028151 100644
--- a/Graphics/GraphicsEngineOpenGL/CMakeLists.txt
+++ b/Graphics/GraphicsEngineOpenGL/CMakeLists.txt
@@ -99,6 +99,10 @@ elseif(PLATFORM_LINUX)
 elseif(PLATFORM_MACOS)
 	list(APPEND SOURCE src/GLContextMacOS.cpp)
 	list(APPEND INCLUDE include/GLContextMacOS.h)
+    set_source_files_properties(
+        src/GLContextMacOS.cpp
+        COMPILE_FLAGS "-x objective-c++"
+    )
 else()
 	message(FATAL_ERROR "Unknown platform")
 endif()
@@ -166,7 +170,11 @@ elseif(PLATFORM_LINUX)
 	set(PRIVATE_DEPENDENCIES ${PRIVATE_DEPENDENCIES} glew-static)
 elseif(PLATFORM_MACOS)
     find_package(OpenGL REQUIRED)
-    set(PRIVATE_DEPENDENCIES ${PRIVATE_DEPENDENCIES} glew-static ${OPENGL_LIBRARY})
+    find_library(APP_KIT AppKit)
+    if (NOT APP_KIT)
+        message(FATAL_ERROR "AppKit not found")
+    endif()
+    set(PRIVATE_DEPENDENCIES ${PRIVATE_DEPENDENCIES} glew-static ${OPENGL_LIBRARY} ${APP_KIT})
 else()
 	message(FATAL_ERROR "Unknown platform")
 endif()
diff --git a/Graphics/GraphicsEngineOpenGL/include/GLContextMacOS.h b/Graphics/GraphicsEngineOpenGL/include/GLContextMacOS.h
index 399251c9..3e5b77bb 100644
--- a/Graphics/GraphicsEngineOpenGL/include/GLContextMacOS.h
+++ b/Graphics/GraphicsEngineOpenGL/include/GLContextMacOS.h
@@ -25,7 +25,6 @@
 
 namespace Diligent
 {
-
     struct ContextInitInfo
     {
         SwapChainDesc SwapChainAttribs;
@@ -35,10 +34,9 @@ namespace Diligent
     class GLContext
     {
     public:
-        typedef void* NativeGLContextType;
+        typedef void* NativeGLContextType; // NSOpenGLContext*
 
         GLContext(const ContextInitInfo &Info, struct DeviceCaps &DeviceCaps);
-        ~GLContext();
         void SwapBuffers();
 
         const SwapChainDesc& GetSwapChainDesc()const{ return m_SwapChainAttribs; }
@@ -46,8 +44,6 @@ namespace Diligent
         NativeGLContextType GetCurrentNativeGLContext();
 
     private:
-        void *m_pNativeWindow = nullptr;
-        NativeGLContextType m_Context;
         SwapChainDesc m_SwapChainAttribs;
     };
 }
diff --git a/Graphics/GraphicsEngineOpenGL/src/GLContextMacOS.cpp b/Graphics/GraphicsEngineOpenGL/src/GLContextMacOS.cpp
index d0c54c37..81e0efdd 100644
--- a/Graphics/GraphicsEngineOpenGL/src/GLContextMacOS.cpp
+++ b/Graphics/GraphicsEngineOpenGL/src/GLContextMacOS.cpp
@@ -23,6 +23,8 @@
 
 #include "pch.h"
 
+#import <AppKit/AppKit.h>
+
 #include "GLContextMacOS.h"
 #include "DeviceCaps.h"
 #include "GLTypeConversions.h"
@@ -31,39 +33,24 @@ namespace Diligent
 {
 
     GLContext::GLContext( const ContextInitInfo &Info, DeviceCaps &DeviceCaps ) :
-        m_pNativeWindow(Info.pNativeWndHandle),
-        m_Context(0),
         m_SwapChainAttribs(Info.SwapChainAttribs)
     {
-        //auto CurrentCtx = glXGetCurrentContext();
-        //if (CurrentCtx == 0)
-        //{
-        //    LOG_ERROR_AND_THROW("No current GL context found!");
-        //}
+        if (GetCurrentNativeGLContext() == nullptr)
+        {
+            LOG_ERROR_AND_THROW("No current GL context found!");
+        }
         
         // Initialize GLEW
         glewExperimental = true; // This is required on MacOS
         GLenum err = glewInit();
         if( GLEW_OK != err )
             LOG_ERROR_AND_THROW( "Failed to initialize GLEW" );
-#if 0
-		if(Info.pNativeWndHandle != nullptr && Info.pDisplay != nullptr)
-		{
-			auto wnd = static_cast<Window>(reinterpret_cast<size_t>(Info.pNativeWndHandle));
-            auto display = reinterpret_cast<Display*>(Info.pDisplay);
-
-            XWindowAttributes XWndAttribs;
-            XGetWindowAttributes(display, wnd, &XWndAttribs);
 
-			m_SwapChainAttribs.Width = XWndAttribs.width;
-			m_SwapChainAttribs.Height = XWndAttribs.height;
-
-            //glXSwapIntervalEXT(0);
-		}
-#endif
-
-                m_SwapChainAttribs.Width = 1024;
-                m_SwapChainAttribs.Height = 768;
+        //Set dummy width and height until resize is called by the app
+        if(m_SwapChainAttribs.Width == 0)
+            m_SwapChainAttribs.Width = 1024;
+        if(m_SwapChainAttribs.Height)
+            m_SwapChainAttribs.Height = 768;
 
         //Checking GL version
         const GLubyte *GLVersionString = glGetString( GL_VERSION );
@@ -106,31 +93,14 @@ namespace Diligent
         DeviceCaps.bMultithreadedResourceCreationSupported = False;
     }
 
-    GLContext::~GLContext()
-    {
-    }
-
     void GLContext::SwapBuffers()
     {
-#if 0
-        if(m_pNativeWindow != nullptr && m_pDisplay != nullptr)
-        {
-			auto wnd = static_cast<Window>(reinterpret_cast<size_t>(m_pNativeWindow));
-            auto display = reinterpret_cast<Display*>(m_pDisplay);
-            glXSwapBuffers(display, wnd);          
-        }
-        else
-        {
-            LOG_ERROR("Swap buffer failed because window and/or display handle is not initialized");
-        }
-#endif
+        LOG_ERROR("Swap buffers operation must be performed by the app on MacOS");
     }
 
     GLContext::NativeGLContextType GLContext::GetCurrentNativeGLContext()
     {
-#if 0
-        return glXGetCurrentContext();
-#endif
-        return nullptr;
+        NSOpenGLContext* CurrentCtx = [NSOpenGLContext currentContext];
+        return CurrentCtx;
     }
 }
-- 
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