Check for device/context loss instead of window minimization for when not to render. Apply pending GPU resource updates on iOS after app has been restored.

Engine/Engine/Engine.cpp

@@ -431,10 +431,9 @@ void Engine::Render()
 {
     PROFILE(Render);
     
-    // Do not render if device lost or if minimized
+    // Do not render if device lost
     Graphics* graphics = GetSubsystem<Graphics>();
-    Input* input = GetSubsystem<Input>();
-    if (!graphics || (input && input->IsMinimized()) || !graphics->BeginFrame())
+    if (!graphics || !graphics->BeginFrame())
         return;
     
     GetSubsystem<Renderer>()->Render();

Engine/Graphics/OpenGL/OGLGraphics.cpp

@@ -144,6 +144,7 @@ Graphics::Graphics(Context* context_) :
     dxtTextureSupport_(false),
     etcTextureSupport_(false),
     pvrtcTextureSupport_(false),
+    wasMinimized_(false),
     numPrimitives_(0),
     numBatches_(0),
     defaultTextureFilterMode_(FILTER_BILINEAR),
@@ -385,8 +386,24 @@ bool Graphics::TakeScreenShot(Image& destImage)
 
 bool Graphics::BeginFrame()
 {
-    if (!IsInitialized() || !impl_->context_)
+    bool minimized = impl_->window_ && (SDL_GetWindowFlags(impl_->window_) & SDL_WINDOW_MINIMIZED);
+    
+    if (!IsInitialized() || IsDeviceLost())
+    {
+        wasMinimized_ = minimized;
         return false;
+    }
+
+    #ifdef IOS
+    // On iOS, check for end of minimization and apply pending GPU resource updates
+    if (wasMinimized_ && !minimized)
+    {
+        LOGDEBUG("Application restored, updating pending GPU resources");
+        for (Vector<GPUObject*>::Iterator i = gpuObjects_.Begin(); i != gpuObjects_.End(); ++i)
+            (*i)->OnDeviceReset();
+    }
+    #endif
+    wasMinimized_ = minimized;
     
     // Set default rendertarget and depth buffer
     ResetRenderTargets();

Engine/Graphics/OpenGL/OGLGraphics.h

@@ -394,6 +394,8 @@ private:
     bool etcTextureSupport_;
     /// PVRTC formats support flag.
     bool pvrtcTextureSupport_;
+    /// Minimized flag for detecting end of minimization.
+    bool wasMinimized_;
     /// Number of primitives this frame.
     unsigned numPrimitives_;
     /// Number of batches this frame.

Engine/Graphics/OpenGL/OGLIndexBuffer.cpp

@@ -152,8 +152,7 @@ bool IndexBuffer::SetData(const void* data)
         else
         {
             LOGWARNING("Index buffer data assignment while device is lost");
-            if (shadowData_)
-                dataPending_ = true;
+            dataPending_ = true;
         }
     }
     
@@ -204,8 +203,7 @@ bool IndexBuffer::SetDataRange(const void* data, unsigned start, unsigned count,
         else
         {
             LOGWARNING("Index buffer data assignment while device is lost");
-            if (shadowData_)
-                dataPending_ = true;
+            dataPending_ = true;
         }
     }
     

Engine/Graphics/OpenGL/OGLVertexBuffer.cpp

@@ -242,8 +242,7 @@ bool VertexBuffer::SetData(const void* data)
         else
         {
             LOGWARNING("Vertex buffer data assignment while device is lost");
-            if (shadowData_)
-                dataPending_ = true;
+            dataPending_ = true;
         }
     }
     
@@ -293,8 +292,7 @@ bool VertexBuffer::SetDataRange(const void* data, unsigned start, unsigned count
         else
         {
             LOGWARNING("Vertex buffer data assignment while device is lost");
-            if (shadowData_)
-                dataPending_ = true;
+            dataPending_ = true;
         }
     }