Remove memory and resource leaks (#754)

* Remove circular reference to renderer on Vk & D3D12 DescriptorSetImpl

* Refactor Stbi image loading such that memory is correctly freed when goes out of scope.
Added Crt memory dump at termination.
Reduced erroneous reporting by scoping TestContext.

* Used capitalized acronym for STBImage to keep Tim happy.

1 files changed, 1 insertions, 1 deletions

diff --git a/tools/gfx/render-vk.cpp b/tools/gfx/render-vk.cpp
index 45b92fe98..32bc91de4 100644
--- a/tools/gfx/render-vk.cpp
+++ b/tools/gfx/render-vk.cpp
@@ -348,7 +348,7 @@ public:
         static Binding::Type _getBindingType(RefObject* ptr);
         void _setBinding(Binding::Type type, UInt range, UInt index, RefObject* ptr);
 
-        RefPtr<VKRenderer>                  m_renderer;
+        VKRenderer*                         m_renderer = nullptr;   ///< Weak pointer, can't be strong, because if set will become circular reference
         RefPtr<DescriptorSetLayoutImpl>     m_layout;
         VkDescriptorSet                     m_descriptorSet = VK_NULL_HANDLE;