OpenGL: on Mac use legacy 2.1 or core 3.2

This implements Mac part of T49012.

Removed options for EGL, ES2, compatibility profile. None of these
exist on Mac platform.

Create a GL 3.2 core context when requested at build time. Old code
just pretended to support core profile.

intern/ghost/intern/GHOST_ContextCGL.h

@@ -134,6 +134,8 @@ private:
 	/** The OpenGL drawing context */
 	NSOpenGLContext *m_openGLContext;
 
+	bool m_coreProfile;
+
 	//static CGLEWContext *s_cglewContext;
 
 	/** The first created OpenGL context (for sharing display lists) */

intern/ghost/intern/GHOST_ContextCGL.mm

@@ -62,6 +62,23 @@ GHOST_ContextCGL::GHOST_ContextCGL(
       m_openGLContext(nil)
 {
 	assert(openGLView != nil);
+
+	// for now be very strict about OpenGL version requested
+	switch (contextMajorVersion) {
+		case 2:
+			assert(contextMinorVersion == 1);
+			assert(contextProfileMask == 0);
+			m_coreProfile = false;
+			break;
+		case 3:
+			// Apple didn't implement 3.0 or 3.1
+			assert(contextMinorVersion == 2);
+			assert(contextProfileMask == GL_CONTEXT_CORE_PROFILE_BIT);
+			m_coreProfile = true;
+			break;
+		default:
+			assert(false);
+	}
 }
 
 
@@ -169,11 +186,15 @@ GHOST_TSuccess GHOST_ContextCGL::updateDrawingContext()
 
 static void makeAttribList(
         std::vector<NSOpenGLPixelFormatAttribute>& attribs,
+        bool coreProfile,
         bool stereoVisual,
         int numOfAASamples,
         bool needAlpha,
         bool needStencil)
 {
+	attribs.push_back(NSOpenGLPFAOpenGLProfile);
+	attribs.push_back(coreProfile ? NSOpenGLProfileVersion3_2Core : NSOpenGLProfileVersionLegacy);
+	
 	// Pixel Format Attributes for the windowed NSOpenGLContext
 	attribs.push_back(NSOpenGLPFADoubleBuffer);
 
@@ -248,7 +269,7 @@ GHOST_TSuccess GHOST_ContextCGL::initializeDrawingContext()
 	static const bool needStencil = false;
 #endif
 
-	makeAttribList(attribs, m_stereoVisual, m_numOfAASamples, needAlpha, needStencil);
+	makeAttribList(attribs, m_coreProfile, m_stereoVisual, m_numOfAASamples, needAlpha, needStencil);
 
 	NSOpenGLPixelFormat *pixelFormat;
 
@@ -261,7 +282,7 @@ GHOST_TSuccess GHOST_ContextCGL::initializeDrawingContext()
 		// (Now that I think about it, does WGL really require the code that it has for finding a lesser match?)
 
 		attribs.clear();
-		makeAttribList(attribs, m_stereoVisual, 0, needAlpha, needStencil);
+		makeAttribList(attribs, m_coreProfile, m_stereoVisual, 0, needAlpha, needStencil);
 		pixelFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:&attribs[0]];
 	}
 

intern/ghost/intern/GHOST_WindowCocoa.mm

@@ -1087,82 +1087,23 @@ GHOST_TSuccess GHOST_WindowCocoa::setOrder(GHOST_TWindowOrder order)
 GHOST_Context *GHOST_WindowCocoa::newDrawingContext(GHOST_TDrawingContextType type)
 {
 	if (type == GHOST_kDrawingContextTypeOpenGL) {
-#if !defined(WITH_GL_EGL)
 
-#if defined(WITH_GL_PROFILE_CORE)
 		GHOST_Context *context = new GHOST_ContextCGL(
 			m_wantStereoVisual,
 			m_wantNumOfAASamples,
 			m_window,
 			m_openGLView,
+
+#if defined(WITH_GL_PROFILE_CORE)
 			GL_CONTEXT_CORE_PROFILE_BIT,
 			3, 2,
+#else
+			0, // no profile bit
+			2, 1,
+#endif
 			GHOST_OPENGL_CGL_CONTEXT_FLAGS,
 			GHOST_OPENGL_CGL_RESET_NOTIFICATION_STRATEGY);
-#elif defined(WITH_GL_PROFILE_ES20)
-		GHOST_Context *context = new GHOST_ContextCGL(
-			m_wantStereoVisual,
-			m_wantNumOfAASamples,
-			m_window,
-			m_openGLView,
-			CGL_CONTEXT_ES2_PROFILE_BIT_EXT,
-			2, 0,
-			GHOST_OPENGL_CGL_CONTEXT_FLAGS,
-			GHOST_OPENGL_CGL_RESET_NOTIFICATION_STRATEGY);
-#elif defined(WITH_GL_PROFILE_COMPAT)
-		GHOST_Context *context = new GHOST_ContextCGL(
-			m_wantStereoVisual,
-			m_wantNumOfAASamples,
-			m_window,
-			m_openGLView,
-			0, // profile bit
-			0, 0,
-			GHOST_OPENGL_CGL_CONTEXT_FLAGS,
-			GHOST_OPENGL_CGL_RESET_NOTIFICATION_STRATEGY);
-#else
-#  error
-#endif
 
-#else
-
-#if defined(WITH_GL_PROFILE_CORE)
-		GHOST_Context *context = new GHOST_ContextEGL(
-			m_wantStereoVisual,
-			m_wantNumOfAASamples,
-			m_window,
-			m_openGLView,
-			EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT,
-			3, 2,
-			GHOST_OPENGL_EGL_CONTEXT_FLAGS,
-			GHOST_OPENGL_EGL_RESET_NOTIFICATION_STRATEGY,
-			EGL_OPENGL_API);
-#elif defined(WITH_GL_PROFILE_ES20)
-		GHOST_Context *context = new GHOST_ContextEGL(
-			m_wantStereoVisual,
-			m_wantNumOfAASamples,
-			m_window,
-			m_openGLView,
-			0, // profile bit
-			2, 0,
-			GHOST_OPENGL_EGL_CONTEXT_FLAGS,
-			GHOST_OPENGL_EGL_RESET_NOTIFICATION_STRATEGY,
-			EGL_OPENGL_ES_API);
-#elif defined(WITH_GL_PROFILE_COMPAT)
-		GHOST_Context *context = new GHOST_ContextEGL(
-			m_wantStereoVisual,
-			m_wantNumOfAASamples,
-			m_window,
-			m_openGLView,
-			0, // profile bit
-			0, 0,
-			GHOST_OPENGL_EGL_CONTEXT_FLAGS,
-			GHOST_OPENGL_EGL_RESET_NOTIFICATION_STRATEGY,
-			EGL_OPENGL_API);
-#else
-#  error
-#endif
-
-#endif
 		if (context->initializeDrawingContext())
 			return context;
 		else