Add Quad Overdraw debug view mode

Source/Engine/Renderer/Editor/QuadOverdrawPass.h

@@ -0,0 +1,46 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#if USE_EDITOR
+
+#include "../RendererPass.h"
+
+class GPUContext;
+class GPUTextureView;
+class GPUPipelineState;
+struct RenderContext;
+
+/// <summary>
+/// Rendering geometry overdraw to visualize performance of pixels rendering in editor.
+/// </summary>
+class QuadOverdrawPass : public RendererPass<QuadOverdrawPass>
+{
+private:
+
+    AssetReference<Shader> _shader;
+    GPUPipelineState* _ps = nullptr;
+
+#if COMPILE_WITH_DEV_ENV
+    void OnShaderReloading(Asset* obj)
+    {
+        _ps->ReleaseGPU();
+        invalidateResources();
+    }
+#endif
+
+public:
+
+    void Render(RenderContext& renderContext, GPUContext* context, GPUTextureView* lightBuffer);
+
+    // [RendererPass]
+    String ToString() const override;
+    void Dispose() override;
+
+protected:
+
+    // [RendererPass]
+    bool setupResources() override;
+};
+
+#endif