//
// Copyright (c) 2008-2017 the Urho3D project.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// 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. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

#include "../../Precompiled.h"

#include "../../Core/Profiler.h"
#include "../../Graphics/Graphics.h"
#include "../../Graphics/GraphicsImpl.h"
#include "../../Graphics/Material.h"
#include "../../IO/FileSystem.h"
#include "../../IO/Log.h"
#include "../../Resource/ResourceCache.h"
#include "../../Resource/XMLFile.h"

#include "../../DebugNew.h"

namespace Atomic
{

static const D3D11_FILTER d3dFilterMode[] =
{
    D3D11_FILTER_MIN_MAG_MIP_POINT,
    D3D11_FILTER_MIN_MAG_LINEAR_MIP_POINT,
    D3D11_FILTER_MIN_MAG_MIP_LINEAR,
    D3D11_FILTER_ANISOTROPIC,
    D3D11_FILTER_MIN_MAG_POINT_MIP_LINEAR,
    D3D11_FILTER_COMPARISON_MIN_MAG_MIP_POINT,
    D3D11_FILTER_COMPARISON_MIN_MAG_LINEAR_MIP_POINT,
    D3D11_FILTER_COMPARISON_MIN_MAG_MIP_LINEAR,
    D3D11_FILTER_COMPARISON_ANISOTROPIC,
    D3D11_FILTER_COMPARISON_MIN_MAG_POINT_MIP_LINEAR
};

static const D3D11_TEXTURE_ADDRESS_MODE d3dAddressMode[] =
{
    D3D11_TEXTURE_ADDRESS_WRAP,
    D3D11_TEXTURE_ADDRESS_MIRROR,
    D3D11_TEXTURE_ADDRESS_CLAMP,
    D3D11_TEXTURE_ADDRESS_BORDER
};

void Texture::SetSRGB(bool enable)
{
    if (graphics_)
        enable &= graphics_->GetSRGBSupport();

    if (enable != sRGB_)
    {
        sRGB_ = enable;
        // If texture had already been created, must recreate it to set the sRGB texture format
        if (object_.name_)
            Create();
    }
}

bool Texture::GetParametersDirty() const
{
    return parametersDirty_ || !sampler_;
}

bool Texture::IsCompressed() const
{
    return format_ == DXGI_FORMAT_BC1_UNORM || format_ == DXGI_FORMAT_BC2_UNORM || format_ == DXGI_FORMAT_BC3_UNORM;
}

unsigned Texture::GetRowDataSize(int width) const
{
    switch (format_)
    {
    case DXGI_FORMAT_R8_UNORM:
    case DXGI_FORMAT_A8_UNORM:
        return (unsigned)width;

    case DXGI_FORMAT_R8G8_UNORM:
    case DXGI_FORMAT_R16_UNORM:
    case DXGI_FORMAT_R16_FLOAT:
    case DXGI_FORMAT_R16_TYPELESS:
        return (unsigned)(width * 2);

    case DXGI_FORMAT_R8G8B8A8_UNORM:
    case DXGI_FORMAT_R16G16_UNORM:
    case DXGI_FORMAT_R16G16_FLOAT:
    case DXGI_FORMAT_R32_FLOAT:
    case DXGI_FORMAT_R24G8_TYPELESS:
    case DXGI_FORMAT_R32_TYPELESS:
        return (unsigned)(width * 4);

    case DXGI_FORMAT_R16G16B16A16_UNORM:
    case DXGI_FORMAT_R16G16B16A16_FLOAT:
        return (unsigned)(width * 8);

    case DXGI_FORMAT_R32G32B32A32_FLOAT:
        return (unsigned)(width * 16);

    case DXGI_FORMAT_BC1_UNORM:
        return (unsigned)(((width + 3) >> 2) * 8);

    case DXGI_FORMAT_BC2_UNORM:
    case DXGI_FORMAT_BC3_UNORM:
        return (unsigned)(((width + 3) >> 2) * 16);

    default:
        return 0;
    }
}

void Texture::UpdateParameters()
{
    if ((!parametersDirty_ && sampler_) || !object_.ptr_)
        return;

    // Release old sampler
    ATOMIC_SAFE_RELEASE(sampler_);

    D3D11_SAMPLER_DESC samplerDesc;
    memset(&samplerDesc, 0, sizeof samplerDesc);
    unsigned filterModeIndex = filterMode_ != FILTER_DEFAULT ? filterMode_ : graphics_->GetDefaultTextureFilterMode();
    if (shadowCompare_)
        filterModeIndex += 5;
    samplerDesc.Filter = d3dFilterMode[filterModeIndex];
    samplerDesc.AddressU = d3dAddressMode[addressMode_[0]];
    samplerDesc.AddressV = d3dAddressMode[addressMode_[1]];
    samplerDesc.AddressW = d3dAddressMode[addressMode_[2]];
    samplerDesc.MaxAnisotropy = anisotropy_ ? anisotropy_ : graphics_->GetDefaultTextureAnisotropy();
    samplerDesc.ComparisonFunc = D3D11_COMPARISON_LESS_EQUAL;
    samplerDesc.MinLOD = -M_INFINITY;
    samplerDesc.MaxLOD = M_INFINITY;
    memcpy(&samplerDesc.BorderColor, borderColor_.Data(), 4 * sizeof(float));

    HRESULT hr = graphics_->GetImpl()->GetDevice()->CreateSamplerState(&samplerDesc, (ID3D11SamplerState**)&sampler_);
    if (FAILED(hr))
    {
        ATOMIC_SAFE_RELEASE(sampler_);
        ATOMIC_LOGD3DERROR("Failed to create sampler state", hr);
    }

    parametersDirty_ = false;
}

unsigned Texture::GetSRVFormat(unsigned format)
{
    if (format == DXGI_FORMAT_R24G8_TYPELESS)
        return DXGI_FORMAT_R24_UNORM_X8_TYPELESS;
    else if (format == DXGI_FORMAT_R16_TYPELESS)
        return DXGI_FORMAT_R16_UNORM;
    else if (format == DXGI_FORMAT_R32_TYPELESS)
        return DXGI_FORMAT_R32_FLOAT;
    else
        return format;
}

unsigned Texture::GetDSVFormat(unsigned format)
{
    if (format == DXGI_FORMAT_R24G8_TYPELESS)
        return DXGI_FORMAT_D24_UNORM_S8_UINT;
    else if (format == DXGI_FORMAT_R16_TYPELESS)
        return DXGI_FORMAT_D16_UNORM;
    else if (format == DXGI_FORMAT_R32_TYPELESS)
        return DXGI_FORMAT_D32_FLOAT;
    else
        return format;
}

unsigned Texture::GetSRGBFormat(unsigned format)
{
    if (format == DXGI_FORMAT_R8G8B8A8_UNORM)
        return DXGI_FORMAT_R8G8B8A8_UNORM_SRGB;
    else if (format == DXGI_FORMAT_BC1_UNORM)
        return DXGI_FORMAT_BC1_UNORM_SRGB;
    else if (format == DXGI_FORMAT_BC2_UNORM)
        return DXGI_FORMAT_BC2_UNORM_SRGB;
    else if (format == DXGI_FORMAT_BC3_UNORM)
        return DXGI_FORMAT_BC3_UNORM_SRGB;
    else
        return format;
}

void Texture::RegenerateLevels()
{
    if (!shaderResourceView_)
        return;

    graphics_->GetImpl()->GetDeviceContext()->GenerateMips((ID3D11ShaderResourceView*)shaderResourceView_);
    levelsDirty_ = false;
}

// ATOMIC BEGIN

// Satisfy script binding link

unsigned Texture::GetExternalFormat(unsigned format)
{
    return 0;
}

unsigned Texture::GetDataType(unsigned format)
{
    return 0;
}

// ATOMIC END


}