Fallback to GLES 2.0 when num_config is 0

when eglChooseConfig() is successed but num_config is 0, creating context is failed.
it is depends on GPU driver, but we need to protect.

Change-Id: I68484312f2719a5e0c108e8d7a70fbf3d10d70f9

diff --git a/dali/internal/graphics/gles/egl-implementation.cpp b/dali/internal/graphics/gles/egl-implementation.cpp
index 91d4fab..2172e37 100755 (executable)
--- a/dali/internal/graphics/gles/egl-implementation.cpp
+++ b/dali/internal/graphics/gles/egl-implementation.cpp
@@ -401,7 +401,10 @@ bool EglImplementation::ChooseConfig( bool isWindowType, ColorDepth depth )
 #endif // DALI_PROFILE_UBUNTU
   configAttribs.PushBack( EGL_NONE );
 
-  if ( eglChooseConfig( mEglDisplay, &(configAttribs[0]), &mEglConfig, 1, &numConfigs ) != EGL_TRUE )
+  // Ensure number of configs is set to 1 as on some drivers,
+  // eglChooseConfig succeeds but does not actually create a proper configuration.
+  if ( ( eglChooseConfig( mEglDisplay, &(configAttribs[0]), &mEglConfig, 1, &numConfigs ) != EGL_TRUE ) ||
+       ( numConfigs != 1 ) )
   {
     if( mGlesVersion >= 30 )
     {
@@ -410,6 +413,13 @@ bool EglImplementation::ChooseConfig( bool isWindowType, ColorDepth depth )
       return false;
     }
 
+    if ( numConfigs != 1 )
+    {
+      DALI_LOG_ERROR("No configurations found.\n");
+
+      TEST_EGL_ERROR("eglChooseConfig");
+    }
+
     EGLint error = eglGetError();
     switch (error)
     {
@@ -460,13 +470,6 @@ bool EglImplementation::ChooseConfig( bool isWindowType, ColorDepth depth )
   }
   mContextAttribs.PushBack( EGL_NONE );
 
-  if ( numConfigs != 1 )
-  {
-    DALI_LOG_ERROR("No configurations found.\n");
-
-    TEST_EGL_ERROR("eglChooseConfig");
-  }
-
   return true;
 }