Graphics: Rework RenderTargets

- RenderTarget have been moved to the Graphics module and are now lightweight objects between the target of rendering (swapchain or texture)
- RenderTexture no longer require a blit between the framegraph texture and the target texture (the target texture is now directly rendered onto using a new feature of the framegraph)
- ForwardFramePipeline viewers are now properly ordered by render order

include/Nazara/Graphics/RenderTarget.hpp

@@ -0,0 +1,43 @@
+// Copyright (C) 2023 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
+// This file is part of the "Nazara Engine - Graphics module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_GRAPHICS_RENDERTARGET_HPP
+#define NAZARA_GRAPHICS_RENDERTARGET_HPP
+
+#include <NazaraUtils/Prerequisites.hpp>
+#include <Nazara/Graphics/Config.hpp>
+#include <Nazara/Math/Vector2.hpp>
+#include <NazaraUtils/Signal.hpp>
+
+namespace Nz
+{
+	class BakedFrameGraph;
+	class CommandBufferBuilder;
+	class Framebuffer;
+	class FrameGraph;
+	class RenderFrame;
+	class RenderPass;
+	class Texture;
+
+	class NAZARA_GRAPHICS_API RenderTarget
+	{
+		public:
+			RenderTarget() = default;
+			virtual ~RenderTarget();
+
+			virtual void OnBuildGraph(FrameGraph& frameGraph, std::size_t attachmentIndex) const = 0;
+			virtual void OnRenderEnd(RenderFrame& renderFrame, const BakedFrameGraph& frameGraph, std::size_t finalAttachment) const = 0;
+
+			virtual const Vector2ui& GetSize() const = 0;
+
+			NazaraSignal(OnRenderTargetRelease, const RenderTarget* /*renderTarget*/);
+			NazaraSignal(OnRenderTargetSizeChange, const RenderTarget* /*renderTarget*/, const Vector2ui& /*newSize*/);
+	};
+}
+
+#include <Nazara/Graphics/RenderTarget.inl>
+
+#endif // NAZARA_GRAPHICS_RENDERTARGET_HPP