/*     Copyright 2015-2019 Egor Yusov
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
 *
 *  In no event and under no legal theory, whether in tort (including negligence), 
 *  contract, or otherwise, unless required by applicable law (such as deliberate 
 *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
 *  liable for any damages, including any direct, indirect, special, incidental, 
 *  or consequential damages of any character arising as a result of this License or 
 *  out of the use or inability to use the software (including but not limited to damages 
 *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
 *  all other commercial damages or losses), even if such Contributor has been advised 
 *  of the possibility of such damages.
 */

#pragma once

/// \file
/// Defines graphics engine utilities

#include "../../GraphicsEngine/interface/GraphicsTypes.h"
#include "../../GraphicsEngine/interface/DepthStencilState.h"
#include "../../GraphicsEngine/interface/BlendState.h"
#include "../../GraphicsEngine/interface/RasterizerState.h"
#include "../../GraphicsEngine/interface/Sampler.h"

namespace Diligent
{
    // Common depth-stencil states
    static const DepthStencilStateDesc DSS_Default{};

    static const DepthStencilStateDesc DSS_DisableDepth
    {
        False, // DepthEnable
        False  // DepthWriteEnable
    };
    

    // Common rasterizer states
    static const RasterizerStateDesc RS_Default{};

    static const RasterizerStateDesc RS_SolidFillNoCull
    {
        FILL_MODE_SOLID,
        CULL_MODE_NONE
    };

    static const RasterizerStateDesc RS_WireFillNoCull
    {
        FILL_MODE_WIREFRAME,
        CULL_MODE_NONE
    };


    // Blend states
    static const BlendStateDesc BS_Default{};

    static const BlendStateDesc BS_AlphaBlend = 
    {
        False, // AlphaToCoverageEnable
        False, // IndependentBlendEnable
	    RenderTargetBlendDesc// RT0
        {
			True,                       // BlendEnable
            False,                      // LogicOperationEnable
            BLEND_FACTOR_SRC_ALPHA,     // SrcBlend
            BLEND_FACTOR_INV_SRC_ALPHA, // DestBlend
			BLEND_OPERATION_ADD,        // BlendOp
            BLEND_FACTOR_SRC_ALPHA,     // SrcBlendAlpha
            BLEND_FACTOR_INV_SRC_ALPHA, // DestBlendAlpha
			BLEND_OPERATION_ADD         // BlendOpAlpha
	    }
    };


    // Common sampler states
    static const SamplerDesc Sam_LinearClamp
    {
        FILTER_TYPE_LINEAR,
        FILTER_TYPE_LINEAR,
        FILTER_TYPE_LINEAR, 
        TEXTURE_ADDRESS_CLAMP,
        TEXTURE_ADDRESS_CLAMP,
        TEXTURE_ADDRESS_CLAMP
    };

    static const SamplerDesc Sam_PointClamp
    {
        FILTER_TYPE_POINT,
        FILTER_TYPE_POINT,
        FILTER_TYPE_POINT, 
        TEXTURE_ADDRESS_CLAMP,
        TEXTURE_ADDRESS_CLAMP,
        TEXTURE_ADDRESS_CLAMP
    };

    static const SamplerDesc Sam_LinearMirror
    {
        FILTER_TYPE_LINEAR,
        FILTER_TYPE_LINEAR,
        FILTER_TYPE_LINEAR, 
        TEXTURE_ADDRESS_MIRROR,
        TEXTURE_ADDRESS_MIRROR,
        TEXTURE_ADDRESS_MIRROR
    };

    static const SamplerDesc Sam_PointWrap
    {
        FILTER_TYPE_POINT,
        FILTER_TYPE_POINT,
        FILTER_TYPE_POINT, 
        TEXTURE_ADDRESS_WRAP,
        TEXTURE_ADDRESS_WRAP,
        TEXTURE_ADDRESS_WRAP
    };

    static const SamplerDesc Sam_LinearWrap
    {
        FILTER_TYPE_LINEAR,
        FILTER_TYPE_LINEAR,
        FILTER_TYPE_LINEAR, 
        TEXTURE_ADDRESS_WRAP,
        TEXTURE_ADDRESS_WRAP,
        TEXTURE_ADDRESS_WRAP
    };

    static const SamplerDesc Sam_Aniso2xClamp
    {
        FILTER_TYPE_ANISOTROPIC,
        FILTER_TYPE_ANISOTROPIC,
        FILTER_TYPE_ANISOTROPIC, 
        TEXTURE_ADDRESS_CLAMP,
        TEXTURE_ADDRESS_CLAMP,
        TEXTURE_ADDRESS_CLAMP,
        0.f, // MipLODBias
        2    // MaxAnisotropy
    };

    static const SamplerDesc Sam_Aniso4xClamp
    {
        FILTER_TYPE_ANISOTROPIC,
        FILTER_TYPE_ANISOTROPIC,
        FILTER_TYPE_ANISOTROPIC, 
        TEXTURE_ADDRESS_CLAMP,
        TEXTURE_ADDRESS_CLAMP,
        TEXTURE_ADDRESS_CLAMP,
        0.f, // MipLODBias
        4    // MaxAnisotropy
    };

    static const SamplerDesc Sam_Aniso8xClamp
    {
        FILTER_TYPE_ANISOTROPIC,
        FILTER_TYPE_ANISOTROPIC,
        FILTER_TYPE_ANISOTROPIC, 
        TEXTURE_ADDRESS_CLAMP,
        TEXTURE_ADDRESS_CLAMP,
        TEXTURE_ADDRESS_CLAMP,
        0.f, // MipLODBias
        8    // MaxAnisotropy
    };

    static const SamplerDesc Sam_Aniso16xClamp
    {
        FILTER_TYPE_ANISOTROPIC,
        FILTER_TYPE_ANISOTROPIC,
        FILTER_TYPE_ANISOTROPIC, 
        TEXTURE_ADDRESS_CLAMP,
        TEXTURE_ADDRESS_CLAMP,
        TEXTURE_ADDRESS_CLAMP,
        0.f,  // MipLODBias
        16    // MaxAnisotropy
    };

    static const SamplerDesc Sam_Aniso8xWrap
    {
        FILTER_TYPE_ANISOTROPIC,
        FILTER_TYPE_ANISOTROPIC,
        FILTER_TYPE_ANISOTROPIC, 
        TEXTURE_ADDRESS_WRAP,
        TEXTURE_ADDRESS_WRAP,
        TEXTURE_ADDRESS_WRAP,
        0.f,  // MipLODBias
        8     // MaxAnisotropy
    };
}
