Renderer/RenderTarget: Add OnRenderTargetRelease signal

include/Nazara/Renderer/RenderTarget.hpp

@@ -28,6 +28,7 @@ namespace Nz
 			virtual const RenderPass& GetRenderPass() const = 0;
 			virtual const Vector2ui& GetSize() const = 0;
 
+			NazaraSignal(OnRenderTargetRelease, const RenderTarget* /*renderTarget*/);
 			NazaraSignal(OnRenderTargetSizeChange, const RenderTarget* /*renderTarget*/, const Vector2ui& /*newSize*/);
 	};
 }

src/Nazara/Renderer/RenderTarget.cpp

@@ -7,5 +7,8 @@
 
 namespace Nz
 {
-	RenderTarget::~RenderTarget() = default;
+	RenderTarget::~RenderTarget()
+	{
+		OnRenderTargetRelease(this);
+	}
 }