From e1a92d9ef029b7f36f32b4c9006d187490b7a179 Mon Sep 17 00:00:00 2001
From: kgv <kgv@opencascade.com>
Date: Tue, 14 Dec 2021 00:25:36 +0300
Subject: [PATCH] 0032484: Configuration, CMake fails to find EGL and GLES2
 include directory on iOS platform

Fixed configuration errors and compilation errors on iOS target due to unexpected EGL usage (non-existing on iOS).
---
 CMakeLists.txt                      |  6 ++++--
 src/OpenGl/OpenGl_GlFunctions.hxx   |  4 +++-
 src/OpenGl/OpenGl_GraphicDriver.cxx | 24 +++++++++++++++++-------
 3 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d98acc0ff9..f4ec871f56 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -661,8 +661,10 @@ endif()
 if (CAN_USE_GLES2)
   if (USE_GLES2)
     add_definitions (-DHAVE_GLES2_EXT)
-    OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/egl")
-    OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/gles2")
+    if (NOT IOS)
+      OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/egl")
+      OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/gles2")
+    endif()
   else()
     OCCT_CHECK_AND_UNSET_GROUP ("3RDPARTY_EGL")
     OCCT_CHECK_AND_UNSET_GROUP ("3RDPARTY_GLES2")
diff --git a/src/OpenGl/OpenGl_GlFunctions.hxx b/src/OpenGl/OpenGl_GlFunctions.hxx
index 3e2f6b64d2..fd361983d4 100644
--- a/src/OpenGl/OpenGl_GlFunctions.hxx
+++ b/src/OpenGl/OpenGl_GlFunctions.hxx
@@ -67,7 +67,9 @@
 
 #if !defined(HAVE_EGL)
 #if defined(__ANDROID__) || defined(__QNX__) || defined(__EMSCRIPTEN__) || defined(HAVE_GLES2) || defined(OCCT_UWP)
-  #define HAVE_EGL
+  #if !defined(__APPLE__)
+    #define HAVE_EGL // EAGL is used instead of EGL
+  #endif
 #elif !defined(_WIN32) && !defined(__APPLE__) && !defined(HAVE_XLIB)
   #define HAVE_EGL
 #endif
diff --git a/src/OpenGl/OpenGl_GraphicDriver.cxx b/src/OpenGl/OpenGl_GraphicDriver.cxx
index b98795d318..bba02640f9 100644
--- a/src/OpenGl/OpenGl_GraphicDriver.cxx
+++ b/src/OpenGl/OpenGl_GraphicDriver.cxx
@@ -52,7 +52,17 @@ IMPLEMENT_STANDARD_RTTIEXT(OpenGl_GraphicDriver,Graphic3d_GraphicDriver)
   #include <GL/glx.h>
 #endif
 
-#if defined(HAVE_EGL) || defined(HAVE_GLES2) || defined(OCCT_UWP) || defined(__ANDROID__) || defined(__QNX__) || defined(__EMSCRIPTEN__)
+#if !defined(HAVE_EGL)
+#if defined(__ANDROID__) || defined(__QNX__) || defined(__EMSCRIPTEN__) || defined(HAVE_GLES2) || defined(OCCT_UWP)
+  #if !defined(__APPLE__)
+    #define HAVE_EGL // EAGL is used instead of EGL
+  #endif
+#elif !defined(_WIN32) && !defined(__APPLE__) && !defined(HAVE_XLIB)
+  #define HAVE_EGL
+#endif
+#endif
+
+#if defined(HAVE_EGL)
   #include <EGL/egl.h>
   #ifndef EGL_OPENGL_ES3_BIT
     #define EGL_OPENGL_ES3_BIT 0x00000040
@@ -63,7 +73,7 @@ namespace
 {
   static const Handle(OpenGl_Context) TheNullGlCtx;
 
-#if defined(HAVE_EGL) || defined(HAVE_GLES2) || defined(OCCT_UWP) || defined(__ANDROID__) || defined(__QNX__) || defined(__EMSCRIPTEN__)
+#if defined(HAVE_EGL)
   //! Wrapper over eglChooseConfig() called with preferred defaults.
   static EGLConfig chooseEglSurfConfig (EGLDisplay theDisplay)
   {
@@ -155,7 +165,7 @@ OpenGl_GraphicDriver::OpenGl_GraphicDriver (const Handle(Aspect_DisplayConnectio
   myMapOfView      (1, NCollection_BaseAllocator::CommonBaseAllocator()),
   myMapOfStructure (1, NCollection_BaseAllocator::CommonBaseAllocator())
 {
-#if defined(HAVE_EGL) || defined(HAVE_GLES2) || defined(OCCT_UWP) || defined(__ANDROID__) || defined(__QNX__) || defined(__EMSCRIPTEN__)
+#if defined(HAVE_EGL)
   myEglDisplay = (Aspect_Display )EGL_NO_DISPLAY;
   myEglContext = (Aspect_RenderingContext )EGL_NO_CONTEXT;
 #endif
@@ -250,7 +260,7 @@ void OpenGl_GraphicDriver::ReleaseContext()
     aWindow->GetGlContext()->forcedRelease();
   }
 
-#if defined(HAVE_EGL) || defined(HAVE_GLES2) || defined(OCCT_UWP) || defined(__ANDROID__) || defined(__QNX__) || defined(__EMSCRIPTEN__)
+#if defined(HAVE_EGL)
   if (myIsOwnContext)
   {
     if (myEglContext != (Aspect_RenderingContext )EGL_NO_CONTEXT)
@@ -285,7 +295,7 @@ void OpenGl_GraphicDriver::ReleaseContext()
 Standard_Boolean OpenGl_GraphicDriver::InitContext()
 {
   ReleaseContext();
-#if defined(HAVE_EGL) || defined(HAVE_GLES2) || defined(OCCT_UWP) || defined(__ANDROID__) || defined(__QNX__) || defined(__EMSCRIPTEN__)
+#if defined(HAVE_EGL)
 
 #if defined(HAVE_XLIB)
   if (myDisplayConnection.IsNull())
@@ -369,7 +379,7 @@ Standard_Boolean OpenGl_GraphicDriver::InitEglContext (Aspect_Display          t
                                                        void*                   theEglConfig)
 {
   ReleaseContext();
-#if defined(HAVE_EGL) || defined(HAVE_GLES2) || defined(OCCT_UWP) || defined(__ANDROID__) || defined(__QNX__) || defined(__EMSCRIPTEN__)
+#if defined(HAVE_EGL)
 #if defined(HAVE_XLIB)
   if (myDisplayConnection.IsNull())
   {
@@ -420,7 +430,7 @@ void OpenGl_GraphicDriver::chooseVisualInfo()
 
   XVisualInfo* aVisInfo = NULL;
   Aspect_FBConfig anFBConfig = NULL;
-#if defined(HAVE_EGL) || defined(HAVE_GLES2)
+#if defined(HAVE_EGL)
   XVisualInfo aVisInfoTmp;
   memset (&aVisInfoTmp, 0, sizeof(aVisInfoTmp));
   aVisInfoTmp.screen = DefaultScreen (aDisp);