//********************************** Banshee Engine (www.banshee3d.com) **************************************************//
//**************** Copyright (c) 2016 Marko Pintera (marko.pintera@gmail.com). All rights reserved. **********************//
#pragma once

#include "BsD3D11Prerequisites.h"
#include "Utility/BsModule.h"

namespace bs { namespace ct
{
	/** @addtogroup D3D11
	 *  @{
	 */

	/**	Helper class for DX11 rendering. */
	class D3D11RenderUtility : public Module<D3D11RenderUtility>
	{
	public:
		D3D11RenderUtility(D3D11Device* device);
		~D3D11RenderUtility();

		/**
		 * Draws a quad that clears the current viewport. This is supposed to emulate functionality available with other
		 * APIs like DX9 and OpenGL where you can clear only a part of the render target. (DX11 API only provides a way to
		 * clear the entire render target).
		 *
		 * @param[in]	clearBuffers	Combination of one or more elements of FrameBufferType denoting which buffers are
		 *								to be cleared.
		 * @param[in]	color			(optional) The color to clear the color buffer with, if enabled.
		 * @param[in]	depth			(optional) The value to initialize the depth buffer with, if enabled.
		 * @param[in]	stencil			(optional) The value to initialize the stencil buffer with, if enabled.
		 */
		void drawClearQuad(UINT32 clearBuffers, const Color& color, float depth, UINT16 stencil);

	protected:
		/**	Initializes resources needed for drawing the clear quad. Should be called one time at start-up. */
		void initClearQuadResources();

		D3D11Device* mDevice;

		ID3D11Buffer* mClearQuadIB;
		ID3D11Buffer* mClearQuadVB;
		ID3D11InputLayout* mClearQuadIL;
		ID3D11VertexShader* mClearQuadVS;
		ID3D11PixelShader* mClearQuadPS;

		SPtr<BlendState> mClearQuadBlendStateYesC;
		SPtr<BlendState> mClearQuadBlendStateNoC;
		SPtr<RasterizerState> mClearQuadRasterizerState;
		SPtr<DepthStencilState> mClearQuadDSStateNoD_NoS;
		SPtr<DepthStencilState> mClearQuadDSStateYesD_NoS;
		SPtr<DepthStencilState> mClearQuadDSStateYesD_YesS;
		SPtr<DepthStencilState> mClearQuadDSStateNoD_YesS;
	};

	/** @} */
}}