[Fix] (MG_Util): Skip GLES initializing if the libs do not exist.

MobileGL/Init.cpp

@@ -19,7 +19,6 @@ namespace MobileGL {
         MGLOG_I("Initializing MobileGL...");
         MG_State::Init();
         MGLOG_D("MobileGL State initialized");
-        // return;
         MG_Backend::Init();
         MGLOG_D("MobileGL Backend initialized");
         MG_Impl::Init();

MobileGL/MG_Backend/Init.cpp

@@ -40,16 +40,19 @@ namespace MobileGL {
             }
         }
 
-        void InitSpecificBackendLibs() {
+        Bool InitSpecificBackendLibs() {
 #if MOBILEGL_BACKEND == MOBILEGL_BACKEND_DILIGENT
             // Nothing to do
             MGLOG_D("Diligent Engine backend loaded");
+            return true;
 #elif MOBILEGL_BACKEND == MOBILEGL_BACKEND_TYPE_DIRECT_GLES
-            MG_Util::BackendLoader::GLES::Init();
+            Bool result = MG_Util::BackendLoader::GLES::Init();
             MGLOG_D("DirectGLES backend loaded, GLES version: %d.%d", MG_External::GLES::g_glesCaps.version.Major,
                     MG_External::GLES::g_glesCaps.version.Minor);
+            return result;
 #else
             MGLOG_W("Unknown backend, skipping backend initialization");
+            return false;
 #endif
         }
 
@@ -73,7 +76,11 @@ namespace MobileGL {
             MG_Config::RendererInfoPtr = MakeUnique<RendererInfo>(Unknown::RendererInfoUnknown);
 #endif
 
-            InitSpecificBackendLibs();
+            Bool result = InitSpecificBackendLibs();
+            if (!result) {
+                MGLOG_W("Failed to initialize MobileGL backend libraries");
+                return;
+            }
             LogBackendInfo();
         }
     } // namespace MG_Backend

MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.cpp

@@ -433,11 +433,16 @@ namespace MobileGL {
 
     namespace MG_Util {
         namespace BackendLoader::GLES {
-            void Init() {
+            Bool Init() {
                 LoadLibs();
+                if (libGLES == nullptr || libEGL == nullptr ||
+                    (glGetError_PTR)ProcAddress(libGLES, "glGetError") == nullptr) {
+                    return false;
+                }
                 InitEGL();
                 InitGLES();
                 DestroyTempEGLCtx();
+                return true;
             }
 
             void *libGLES = nullptr, *libEGL = nullptr;

MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.h

@@ -940,7 +940,7 @@ namespace MobileGL {
     namespace MG_Util {
         namespace BackendLoader {
             namespace GLES {
-                void Init();
+                Bool Init();
                 extern void *libGLES, *libEGL;
 
                 void* ProcAddress(void* lib, const char* name);