/*
 *  Copyright 2019-2021 Diligent Graphics LLC
 *  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
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  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"

DILIGENT_BEGIN_NAMESPACE(Diligent)

// clang-format off

// 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   // Render Target 0
    {
		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_ComparsionLinearClamp
{
    FILTER_TYPE_COMPARISON_LINEAR,
    FILTER_TYPE_COMPARISON_LINEAR,
    FILTER_TYPE_COMPARISON_LINEAR, 
    TEXTURE_ADDRESS_CLAMP,
    TEXTURE_ADDRESS_CLAMP,
    TEXTURE_ADDRESS_CLAMP,
    SamplerDesc{}.MipLODBias,
    SamplerDesc{}.MaxAnisotropy,
    COMPARISON_FUNC_LESS
};

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_Aniso4xWrap
{
    FILTER_TYPE_ANISOTROPIC,
    FILTER_TYPE_ANISOTROPIC,
    FILTER_TYPE_ANISOTROPIC, 
    TEXTURE_ADDRESS_WRAP,
    TEXTURE_ADDRESS_WRAP,
    TEXTURE_ADDRESS_WRAP,
    0.f,  // MipLODBias
    4     // 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
};

DILIGENT_END_NAMESPACE // namespace Diligent