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

#include "BsD3D11Prerequisites.h"
#include "Image/BsTexture.h"
#include "Image/BsPixelData.h"
#include "RenderAPI/BsIndexBuffer.h"
#include "RenderAPI/BsVertexData.h"
#include "RenderAPI/BsSamplerState.h"

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

	/**	Helper class that maps engine types to DirectX 11 types. */
	class D3D11Mappings
	{
	public:
		/**	Converts engine to DX11 specific texture addressing mode. */
		static D3D11_TEXTURE_ADDRESS_MODE get(TextureAddressingMode tam);

		/**	Converts engine to DX11 specific blend factor. */
		static D3D11_BLEND get(BlendFactor bf);

		/**	Converts engine to DX11 specific blend operation. */
		static D3D11_BLEND_OP get(BlendOperation bo);

		/**	Converts engine to DX11 specific comparison function. */
		static D3D11_COMPARISON_FUNC get(CompareFunction cf);

		/**	Converts engine to DX11 specific culling mode. */
		static D3D11_CULL_MODE get(CullingMode cm);

		/**	Converts engine to DX11 specific polygon fill mode. */
		static D3D11_FILL_MODE get(PolygonMode mode);

		/** Return DirectX 11 stencil operation and optionally invert it (greater than becomes less than, etc.). */
		static D3D11_STENCIL_OP get(StencilOperation op, bool invert = false);

		/**
		 * Converts engine texture filter type to DirectX 11 filter shift (used for combining to get actual min/mag/mip
		 * filter bit location).
		 */
		static DWORD get(FilterType ft);

		/**
		 * Returns DirectX 11 texture filter from the provided min, mag and mip filter options, and optionally a filter
		 * with comparison support.
		 */
		static D3D11_FILTER get(const FilterOptions min, const FilterOptions mag, 
			const FilterOptions mip, const bool comparison = false);

		/**	Converts engine to DX11 buffer usage. */
		static DWORD get(GpuBufferUsage usage);

		/** Converts engine to DX11 lock options, while also constraining the options depending on provided usage type. */
		static D3D11_MAP get(GpuLockOptions options, GpuBufferUsage usage);

		/**	Converts engine to DX11 vertex element type. */
		static DXGI_FORMAT get(VertexElementType type);

		/**	Returns a string describing the provided vertex element semantic. */
		static LPCSTR get(VertexElementSemantic sem);

		/**
		 * Returns engine semantic from the provided semantic string. Throws an exception for semantics that do not exist.
		 */
		static VertexElementSemantic get(LPCSTR sem);

		/**	Converts DirectX 11 GPU parameter component type to engine vertex element type. */
		static VertexElementType getInputType(D3D_REGISTER_COMPONENT_TYPE type);

		/**	Returns DX11 primitive topology based on the provided draw operation type. */
		static D3D11_PRIMITIVE_TOPOLOGY getPrimitiveType(DrawOperationType type);

		/**	Converts engine color to DX11 color. */
		static void get(const Color& inColor, float* outColor);

		/**	Checks does the provided map value include writing. */
		static bool isMappingWrite(D3D11_MAP map);

		/**	Checks does the provided map value include reading. */
		static bool isMappingRead(D3D11_MAP map);

		/**	Converts DX11 pixel format to engine pixel format. */
		static PixelFormat getPF(DXGI_FORMAT d3dPF);

		/**
		 * Converts engine pixel format to DX11 pixel format. Some formats depend on whether hardware gamma is used or not,
		 * in which case set the @p hwGamma parameter as needed. 
		 */
		static DXGI_FORMAT getPF(PixelFormat format, bool hwGamma);
		
		/** Converts engine GPU buffer format to DX11 GPU buffer format. */
		static DXGI_FORMAT getBF(GpuBufferFormat format);

		/** 
		 * Returns a typeless version of a depth stencil format. Required for creating a depth stencil texture it can be
		 * bound both for shader reading and depth/stencil writing.
		 */
		static DXGI_FORMAT getTypelessDepthStencilPF(PixelFormat format);

		/** Returns a format of a depth stencil texture that can be used for reading the texture in the shader. */
		static DXGI_FORMAT getShaderResourceDepthStencilPF(PixelFormat format);

		/**	Converts engine to DX11 buffer usage. */
		static D3D11_USAGE getUsage(GpuBufferUsage mUsage);

		/**	Converts engine to DX11 buffer access flags. */
		static UINT getAccessFlags(GpuBufferUsage mUsage);

		/**	Converts engine to DX11 lock options. */
		static D3D11_MAP getLockOptions(GpuLockOptions lockOptions);

		/**	Checks is the provided buffer usage dynamic. */
		static bool isDynamic(GpuBufferUsage mUsage);

		/**	Finds the closest pixel format that DX11 supports. */
		static PixelFormat getClosestSupportedPF(PixelFormat format, TextureType texType, int usage);

		/**
		 * Returns size in bytes of a pixel surface of the specified size and format, while using DX11 allocation rules for
		 * padding.
		 */
		static UINT32 getSizeInBytes(PixelFormat pf, UINT32 width = 1, UINT32 height = 1);
	};

	/** @} */
}}