#include "precompiled.h"
//
// Copyright (c) 2012-2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// TextureStorage11.cpp: Implements the abstract rx::TextureStorage11 class and its concrete derived
// classes TextureStorage11_2D and TextureStorage11_Cube, which act as the interface to the D3D11 texture.

#include "libGLESv2/renderer/d3d/d3d11/TextureStorage11.h"

#include "libGLESv2/renderer/d3d/TextureD3D.h"
#include "libGLESv2/renderer/d3d/d3d11/Renderer11.h"
#include "libGLESv2/renderer/d3d/d3d11/RenderTarget11.h"
#include "libGLESv2/renderer/d3d/d3d11/SwapChain11.h"
#include "libGLESv2/renderer/d3d/d3d11/renderer11_utils.h"
#include "libGLESv2/renderer/d3d/d3d11/Blit11.h"
#include "libGLESv2/renderer/d3d/d3d11/formatutils11.h"

#include "common/utilities.h"
#include "libGLESv2/main.h"

namespace rx
{

TextureStorage11::SwizzleCacheValue::SwizzleCacheValue()
    : swizzleRed(GL_NONE), swizzleGreen(GL_NONE), swizzleBlue(GL_NONE), swizzleAlpha(GL_NONE)
{
}

TextureStorage11::SwizzleCacheValue::SwizzleCacheValue(GLenum red, GLenum green, GLenum blue, GLenum alpha)
    : swizzleRed(red), swizzleGreen(green), swizzleBlue(blue), swizzleAlpha(alpha)
{
}

bool TextureStorage11::SwizzleCacheValue::operator==(const SwizzleCacheValue &other) const
{
    return swizzleRed == other.swizzleRed &&
           swizzleGreen == other.swizzleGreen &&
           swizzleBlue == other.swizzleBlue &&
           swizzleAlpha == other.swizzleAlpha;
}

bool TextureStorage11::SwizzleCacheValue::operator!=(const SwizzleCacheValue &other) const
{
    return !(*this == other);
}

TextureStorage11::SRVKey::SRVKey(int baseLevel, int mipLevels, bool swizzle)
    : baseLevel(baseLevel), mipLevels(mipLevels), swizzle(swizzle)
{
}

bool TextureStorage11::SRVKey::operator==(const SRVKey &rhs) const
{
    return baseLevel == rhs.baseLevel &&
           mipLevels == rhs.mipLevels &&
           swizzle == rhs.swizzle;
}

TextureStorage11::SRVCache::~SRVCache()
{
    for (size_t i = 0; i < cache.size(); i++)
    {
        SafeRelease(cache[i].srv);
    }
}

ID3D11ShaderResourceView *TextureStorage11::SRVCache::find(const SRVKey &key) const
{
    for (size_t i = 0; i < cache.size(); i++)
    {
        if (cache[i].key == key)
        {
            return cache[i].srv;
        }
    }

    return NULL;
}

ID3D11ShaderResourceView *TextureStorage11::SRVCache::add(const SRVKey &key, ID3D11ShaderResourceView *srv)
{
    SRVPair pair = {key, srv};
    cache.push_back(pair);

    return srv;
}

TextureStorage11::TextureStorage11(Renderer *renderer, UINT bindFlags)
    : mBindFlags(bindFlags),
      mTopLevel(0),
      mMipLevels(0),
      mTextureFormat(DXGI_FORMAT_UNKNOWN),
      mShaderResourceFormat(DXGI_FORMAT_UNKNOWN),
      mRenderTargetFormat(DXGI_FORMAT_UNKNOWN),
      mDepthStencilFormat(DXGI_FORMAT_UNKNOWN),
      mTextureWidth(0),
      mTextureHeight(0),
      mTextureDepth(0)
{
    mRenderer = Renderer11::makeRenderer11(renderer);

    for (unsigned int i = 0; i < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; i++)
    {
        mLevelSRVs[i] = NULL;
    }
}

TextureStorage11::~TextureStorage11()
{
    for (unsigned int level = 0; level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; level++)
    {
        SafeRelease(mLevelSRVs[level]);
    }
}

TextureStorage11 *TextureStorage11::makeTextureStorage11(TextureStorage *storage)
{
    ASSERT(HAS_DYNAMIC_TYPE(TextureStorage11*, storage));
    return static_cast<TextureStorage11*>(storage);
}

DWORD TextureStorage11::GetTextureBindFlags(GLenum internalFormat, bool renderTarget)
{
    UINT bindFlags = 0;

    if (gl_d3d11::GetSRVFormat(internalFormat) != DXGI_FORMAT_UNKNOWN)
    {
        bindFlags |= D3D11_BIND_SHADER_RESOURCE;
    }
    if (gl_d3d11::GetDSVFormat(internalFormat) != DXGI_FORMAT_UNKNOWN)
    {
        bindFlags |= D3D11_BIND_DEPTH_STENCIL;
    }
    if (gl_d3d11::GetRTVFormat(internalFormat) != DXGI_FORMAT_UNKNOWN && renderTarget)
    {
        bindFlags |= D3D11_BIND_RENDER_TARGET;
    }

    return bindFlags;
}

UINT TextureStorage11::getBindFlags() const
{
    return mBindFlags;
}

int TextureStorage11::getTopLevel() const
{
    return mTopLevel;
}

bool TextureStorage11::isRenderTarget() const
{
    return (mBindFlags & (D3D11_BIND_RENDER_TARGET | D3D11_BIND_DEPTH_STENCIL)) != 0;
}

bool TextureStorage11::isManaged() const
{
    return false;
}

int TextureStorage11::getLevelCount() const
{
    return mMipLevels - mTopLevel;
}

int TextureStorage11::getLevelWidth(int mipLevel) const
{
    return std::max(static_cast<int>(mTextureWidth) >> mipLevel, 1);
}

int TextureStorage11::getLevelHeight(int mipLevel) const
{
    return std::max(static_cast<int>(mTextureHeight) >> mipLevel, 1);
}

int TextureStorage11::getLevelDepth(int mipLevel) const
{
    return std::max(static_cast<int>(mTextureDepth) >> mipLevel, 1);
}

UINT TextureStorage11::getSubresourceIndex(int mipLevel, int layerTarget) const
{
    UINT index = 0;
    if (getResource())
    {
        index = D3D11CalcSubresource(mipLevel, layerTarget, mMipLevels);
    }
    return index;
}

ID3D11ShaderResourceView *TextureStorage11::getSRV(const gl::SamplerState &samplerState)
{
    bool swizzleRequired = samplerState.swizzleRequired();
    bool mipmapping = IsMipmapFiltered(samplerState);
    unsigned int mipLevels = mipmapping ? (samplerState.maxLevel - samplerState.baseLevel) : 1;

    // Make sure there's 'mipLevels' mipmap levels below the base level (offset by the top level,  which corresponds to GL level 0)
    mipLevels = std::min(mipLevels, mMipLevels - mTopLevel - samplerState.baseLevel);

    if (swizzleRequired)
    {
        verifySwizzleExists(samplerState.swizzleRed, samplerState.swizzleGreen, samplerState.swizzleBlue, samplerState.swizzleAlpha);
    }
    
    SRVKey key(samplerState.baseLevel, mipLevels, swizzleRequired);
    ID3D11ShaderResourceView *srv = srvCache.find(key);

    if(srv)
    {
        return srv;
    }

    DXGI_FORMAT format = (swizzleRequired ? mSwizzleShaderResourceFormat : mShaderResourceFormat);
    ID3D11Resource *texture = swizzleRequired ? getSwizzleTexture() : getResource();

    srv = createSRV(samplerState.baseLevel, mipLevels, format, texture);
    
    return srvCache.add(key, srv);
}

ID3D11ShaderResourceView *TextureStorage11::getSRVLevel(int mipLevel)
{
    if (mipLevel >= 0 && mipLevel < getLevelCount())
    {
        if (!mLevelSRVs[mipLevel])
        {
            mLevelSRVs[mipLevel] = createSRV(mipLevel, 1, mShaderResourceFormat, getResource());
        }

        return mLevelSRVs[mipLevel];
    }
    else
    {
        return NULL;
    }
}

void TextureStorage11::generateSwizzles(GLenum swizzleRed, GLenum swizzleGreen, GLenum swizzleBlue, GLenum swizzleAlpha)
{
    SwizzleCacheValue swizzleTarget(swizzleRed, swizzleGreen, swizzleBlue, swizzleAlpha);
    for (int level = 0; level < getLevelCount(); level++)
    {
        // Check if the swizzle for this level is out of date
        if (mSwizzleCache[level] != swizzleTarget)
        {
            // Need to re-render the swizzle for this level
            ID3D11ShaderResourceView *sourceSRV = getSRVLevel(level);
            ID3D11RenderTargetView *destRTV = getSwizzleRenderTarget(level);

            gl::Extents size(getLevelWidth(level), getLevelHeight(level), getLevelDepth(level));

            Blit11 *blitter = mRenderer->getBlitter();

            if (blitter->swizzleTexture(sourceSRV, destRTV, size, swizzleRed, swizzleGreen, swizzleBlue, swizzleAlpha))
            {
                mSwizzleCache[level] = swizzleTarget;
            }
            else
            {
                ERR("Failed to swizzle texture.");
            }
        }
    }
}

void TextureStorage11::invalidateSwizzleCacheLevel(int mipLevel)
{
    if (mipLevel >= 0 && static_cast<unsigned int>(mipLevel) < ArraySize(mSwizzleCache))
    {
        // The default constructor of SwizzleCacheValue has GL_NONE for all channels which is not a
        // valid swizzle combination
        mSwizzleCache[mipLevel] = SwizzleCacheValue();
    }
}

void TextureStorage11::invalidateSwizzleCache()
{
    for (unsigned int mipLevel = 0; mipLevel < ArraySize(mSwizzleCache); mipLevel++)
    {
        invalidateSwizzleCacheLevel(mipLevel);
    }
}

bool TextureStorage11::updateSubresourceLevel(ID3D11Resource *srcTexture, unsigned int sourceSubresource,
                                              int level, int layerTarget, GLint xoffset, GLint yoffset, GLint zoffset,
                                              GLsizei width, GLsizei height, GLsizei depth)
{
    if (srcTexture)
    {
        invalidateSwizzleCacheLevel(level);

        gl::Extents texSize(getLevelWidth(level), getLevelHeight(level), getLevelDepth(level));
        gl::Box copyArea(xoffset, yoffset, zoffset, width, height, depth);

        bool fullCopy = copyArea.x == 0 &&
                        copyArea.y == 0 &&
                        copyArea.z == 0 &&
                        copyArea.width  == texSize.width &&
                        copyArea.height == texSize.height &&
                        copyArea.depth  == texSize.depth;

        ID3D11Resource *dstTexture = getResource();
        unsigned int dstSubresource = getSubresourceIndex(level + mTopLevel, layerTarget);

        ASSERT(dstTexture);

        if (!fullCopy && (d3d11::GetDepthBits(mTextureFormat) > 0 || d3d11::GetStencilBits(mTextureFormat) > 0))
        {
            // CopySubresourceRegion cannot copy partial depth stencils, use the blitter instead
            Blit11 *blitter = mRenderer->getBlitter();

            return blitter->copyDepthStencil(srcTexture, sourceSubresource, copyArea, texSize,
                                             dstTexture, dstSubresource, copyArea, texSize,
                                             NULL);
        }
        else
        {
            D3D11_BOX srcBox;
            srcBox.left = copyArea.x;
            srcBox.top = copyArea.y;
            srcBox.right = copyArea.x + roundUp((unsigned int)width, d3d11::GetBlockWidth(mTextureFormat));
            srcBox.bottom = copyArea.y + roundUp((unsigned int)height, d3d11::GetBlockHeight(mTextureFormat));
            srcBox.front = copyArea.z;
            srcBox.back = copyArea.z + copyArea.depth;

            ID3D11DeviceContext *context = mRenderer->getDeviceContext();

            context->CopySubresourceRegion(dstTexture, dstSubresource, copyArea.x, copyArea.y, copyArea.z,
                                           srcTexture, sourceSubresource, fullCopy ? NULL : &srcBox);
            return true;
        }
    }

    return false;
}

void TextureStorage11::generateMipmapLayer(RenderTarget11 *source, RenderTarget11 *dest)
{
    if (source && dest)
    {
        ID3D11ShaderResourceView *sourceSRV = source->getShaderResourceView();
        ID3D11RenderTargetView *destRTV = dest->getRenderTargetView();

        if (sourceSRV && destRTV)
        {
            gl::Box sourceArea(0, 0, 0, source->getWidth(), source->getHeight(), source->getDepth());
            gl::Extents sourceSize(source->getWidth(), source->getHeight(), source->getDepth());

            gl::Box destArea(0, 0, 0, dest->getWidth(), dest->getHeight(), dest->getDepth());
            gl::Extents destSize(dest->getWidth(), dest->getHeight(), dest->getDepth());

            Blit11 *blitter = mRenderer->getBlitter();

            blitter->copyTexture(sourceSRV, sourceArea, sourceSize, destRTV, destArea, destSize, NULL,
                                 gl::GetInternalFormatInfo(source->getInternalFormat()).format, GL_LINEAR);
        }
    }
}

void TextureStorage11::verifySwizzleExists(GLenum swizzleRed, GLenum swizzleGreen, GLenum swizzleBlue, GLenum swizzleAlpha)
{
    SwizzleCacheValue swizzleTarget(swizzleRed, swizzleGreen, swizzleBlue, swizzleAlpha);
    for (unsigned int level = 0; level < mMipLevels; level++)
    {
        ASSERT(mSwizzleCache[level] == swizzleTarget);
    }
}

TextureStorage11_2D::TextureStorage11_2D(Renderer *renderer, SwapChain11 *swapchain)
    : TextureStorage11(renderer, D3D11_BIND_RENDER_TARGET | D3D11_BIND_SHADER_RESOURCE)
{
    mTexture = swapchain->getOffscreenTexture();
    mTexture->AddRef();
    mSwizzleTexture = NULL;

    for (unsigned int i = 0; i < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; i++)
    {
        mRenderTarget[i] = NULL;
        mSwizzleRenderTargets[i] = NULL;
    }

    D3D11_TEXTURE2D_DESC texDesc;
    mTexture->GetDesc(&texDesc);
    mMipLevels = texDesc.MipLevels;
    mTextureFormat = texDesc.Format;
    mTextureWidth = texDesc.Width;
    mTextureHeight = texDesc.Height;
    mTextureDepth = 1;

    ID3D11ShaderResourceView *srv = swapchain->getRenderTargetShaderResource();
    D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
    srv->GetDesc(&srvDesc);
    mShaderResourceFormat = srvDesc.Format;

    ID3D11RenderTargetView* offscreenRTV = swapchain->getRenderTarget();
    D3D11_RENDER_TARGET_VIEW_DESC rtvDesc;
    offscreenRTV->GetDesc(&rtvDesc);
    mRenderTargetFormat = rtvDesc.Format;

    GLenum internalFormat = d3d11_gl::GetInternalFormat(mTextureFormat);
    mSwizzleTextureFormat = gl_d3d11::GetSwizzleTexFormat(internalFormat);
    mSwizzleShaderResourceFormat = gl_d3d11::GetSwizzleSRVFormat(internalFormat);
    mSwizzleRenderTargetFormat = gl_d3d11::GetSwizzleRTVFormat(internalFormat);

    mDepthStencilFormat = DXGI_FORMAT_UNKNOWN;
}

TextureStorage11_2D::TextureStorage11_2D(Renderer *renderer, GLenum internalformat, bool renderTarget, GLsizei width, GLsizei height, int levels)
    : TextureStorage11(renderer, GetTextureBindFlags(internalformat, renderTarget))
{
    mTexture = NULL;
    mSwizzleTexture = NULL;

    for (unsigned int i = 0; i < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; i++)
    {
        mRenderTarget[i] = NULL;
        mSwizzleRenderTargets[i] = NULL;
    }

    mTextureFormat = gl_d3d11::GetTexFormat(internalformat);
    mShaderResourceFormat = gl_d3d11::GetSRVFormat(internalformat);
    mDepthStencilFormat = gl_d3d11::GetDSVFormat(internalformat);
    mRenderTargetFormat = gl_d3d11::GetRTVFormat(internalformat);
    mSwizzleTextureFormat = gl_d3d11::GetSwizzleTexFormat(internalformat);
    mSwizzleShaderResourceFormat = gl_d3d11::GetSwizzleSRVFormat(internalformat);
    mSwizzleRenderTargetFormat = gl_d3d11::GetSwizzleRTVFormat(internalformat);

    // if the width or height is not positive this should be treated as an incomplete texture
    // we handle that here by skipping the d3d texture creation
    if (width > 0 && height > 0)
    {
        // adjust size if needed for compressed textures
        d3d11::MakeValidSize(false, mTextureFormat, &width, &height, &mTopLevel);

        ID3D11Device *device = mRenderer->getDevice();

        D3D11_TEXTURE2D_DESC desc;
        desc.Width = width;      // Compressed texture size constraints?
        desc.Height = height;
        desc.MipLevels = ((levels > 0) ? (mTopLevel + levels) : 0);
        desc.ArraySize = 1;
        desc.Format = mTextureFormat;
        desc.SampleDesc.Count = 1;
        desc.SampleDesc.Quality = 0;
        desc.Usage = D3D11_USAGE_DEFAULT;
        desc.BindFlags = getBindFlags();
        desc.CPUAccessFlags = 0;
        desc.MiscFlags = 0;

        HRESULT result = device->CreateTexture2D(&desc, NULL, &mTexture);

        // this can happen from windows TDR
        if (d3d11::isDeviceLostError(result))
        {
            mRenderer->notifyDeviceLost();
            gl::error(GL_OUT_OF_MEMORY);
        }
        else if (FAILED(result))
        {
            ASSERT(result == E_OUTOFMEMORY);
            ERR("Creating image failed.");
            gl::error(GL_OUT_OF_MEMORY);
        }
        else
        {
            mTexture->GetDesc(&desc);
            mMipLevels = desc.MipLevels;
            mTextureWidth = desc.Width;
            mTextureHeight = desc.Height;
            mTextureDepth = 1;
        }
    }
}

TextureStorage11_2D::~TextureStorage11_2D()
{
    SafeRelease(mTexture);
    SafeRelease(mSwizzleTexture);

    for (unsigned int i = 0; i < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; i++)
    {
        SafeDelete(mRenderTarget[i]);
        SafeRelease(mSwizzleRenderTargets[i]);
    }
}

TextureStorage11_2D *TextureStorage11_2D::makeTextureStorage11_2D(TextureStorage *storage)
{
    ASSERT(HAS_DYNAMIC_TYPE(TextureStorage11_2D*, storage));
    return static_cast<TextureStorage11_2D*>(storage);
}

ID3D11Resource *TextureStorage11_2D::getResource() const
{
    return mTexture;
}

RenderTarget *TextureStorage11_2D::getRenderTarget(int level)
{
    if (level >= 0 && level < getLevelCount())
    {
        if (!mRenderTarget[level])
        {
            ID3D11ShaderResourceView *srv = getSRVLevel(level);
            if (!srv)
            {
                return NULL;
            }

            if (mRenderTargetFormat != DXGI_FORMAT_UNKNOWN)
            {
                ID3D11Device *device = mRenderer->getDevice();

                D3D11_RENDER_TARGET_VIEW_DESC rtvDesc;
                rtvDesc.Format = mRenderTargetFormat;
                rtvDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;
                rtvDesc.Texture2D.MipSlice = mTopLevel + level;

                ID3D11RenderTargetView *rtv;
                HRESULT result = device->CreateRenderTargetView(mTexture, &rtvDesc, &rtv);

                if (result == E_OUTOFMEMORY)
                {
                    return gl::error(GL_OUT_OF_MEMORY, static_cast<RenderTarget*>(NULL));
                }
                ASSERT(SUCCEEDED(result));

                mRenderTarget[level] = new RenderTarget11(mRenderer, rtv, mTexture, srv, getLevelWidth(level), getLevelHeight(level), 1);

                // RenderTarget will take ownership of these resources
                SafeRelease(rtv);
            }
            else if (mDepthStencilFormat != DXGI_FORMAT_UNKNOWN)
            {
                ID3D11Device *device = mRenderer->getDevice();

                D3D11_DEPTH_STENCIL_VIEW_DESC dsvDesc;
                dsvDesc.Format = mDepthStencilFormat;
                dsvDesc.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2D;
                dsvDesc.Texture2D.MipSlice = mTopLevel + level;
                dsvDesc.Flags = 0;

                ID3D11DepthStencilView *dsv;
                HRESULT result = device->CreateDepthStencilView(mTexture, &dsvDesc, &dsv);

                if (result == E_OUTOFMEMORY)
                {
                    SafeRelease(srv);
                    return gl::error(GL_OUT_OF_MEMORY, static_cast<RenderTarget*>(NULL));
                }
                ASSERT(SUCCEEDED(result));

                mRenderTarget[level] = new RenderTarget11(mRenderer, dsv, mTexture, srv, getLevelWidth(level), getLevelHeight(level), 1);

                // RenderTarget will take ownership of these resources
                SafeRelease(dsv);
            }
            else
            {
                UNREACHABLE();
            }
        }

        return mRenderTarget[level];
    }
    else
    {
        return NULL;
    }
}

ID3D11ShaderResourceView *TextureStorage11_2D::createSRV(int baseLevel, int mipLevels, DXGI_FORMAT format, ID3D11Resource *texture)
{
    D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
    srvDesc.Format = format;
    srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
    srvDesc.Texture2D.MostDetailedMip = mTopLevel + baseLevel;
    srvDesc.Texture2D.MipLevels = mipLevels;

    ID3D11ShaderResourceView *SRV = NULL;

    ID3D11Device *device = mRenderer->getDevice();
    HRESULT result = device->CreateShaderResourceView(texture, &srvDesc, &SRV);

    if (result == E_OUTOFMEMORY)
    {
        gl::error(GL_OUT_OF_MEMORY);
    }
    ASSERT(SUCCEEDED(result));

    return SRV;
}

void TextureStorage11_2D::generateMipmap(int level)
{
    invalidateSwizzleCacheLevel(level);

    RenderTarget11 *source = RenderTarget11::makeRenderTarget11(getRenderTarget(level - 1));
    RenderTarget11 *dest = RenderTarget11::makeRenderTarget11(getRenderTarget(level));

    generateMipmapLayer(source, dest);
}

ID3D11Resource *TextureStorage11_2D::getSwizzleTexture()
{
    if (!mSwizzleTexture)
    {
        ID3D11Device *device = mRenderer->getDevice();

        D3D11_TEXTURE2D_DESC desc;
        desc.Width = mTextureWidth;
        desc.Height = mTextureHeight;
        desc.MipLevels = mMipLevels;
        desc.ArraySize = 1;
        desc.Format = mSwizzleTextureFormat;
        desc.SampleDesc.Count = 1;
        desc.SampleDesc.Quality = 0;
        desc.Usage = D3D11_USAGE_DEFAULT;
        desc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_RENDER_TARGET;
        desc.CPUAccessFlags = 0;
        desc.MiscFlags = 0;

        HRESULT result = device->CreateTexture2D(&desc, NULL, &mSwizzleTexture);

        if (result == E_OUTOFMEMORY)
        {
            return gl::error(GL_OUT_OF_MEMORY, static_cast<ID3D11Texture2D*>(NULL));
        }
        ASSERT(SUCCEEDED(result));
    }

    return mSwizzleTexture;
}

ID3D11RenderTargetView *TextureStorage11_2D::getSwizzleRenderTarget(int mipLevel)
{
    if (mipLevel >= 0 && mipLevel < getLevelCount())
    {
        if (!mSwizzleRenderTargets[mipLevel])
        {
            ID3D11Resource *swizzleTexture = getSwizzleTexture();
            if (!swizzleTexture)
            {
                return NULL;
            }

            ID3D11Device *device = mRenderer->getDevice();

            D3D11_RENDER_TARGET_VIEW_DESC rtvDesc;
            rtvDesc.Format = mSwizzleRenderTargetFormat;
            rtvDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;
            rtvDesc.Texture2D.MipSlice = mTopLevel + mipLevel;

            HRESULT result = device->CreateRenderTargetView(mSwizzleTexture, &rtvDesc, &mSwizzleRenderTargets[mipLevel]);
            if (result == E_OUTOFMEMORY)
            {
                return gl::error(GL_OUT_OF_MEMORY, static_cast<ID3D11RenderTargetView*>(NULL));
            }
            ASSERT(SUCCEEDED(result));
        }

        return mSwizzleRenderTargets[mipLevel];
    }
    else
    {
        return NULL;
    }
}

unsigned int TextureStorage11_2D::getTextureLevelDepth(int mipLevel) const
{
    return 1;
}

TextureStorage11_Cube::TextureStorage11_Cube(Renderer *renderer, GLenum internalformat, bool renderTarget, int size, int levels)
    : TextureStorage11(renderer, GetTextureBindFlags(internalformat, renderTarget))
{
    mTexture = NULL;
    mSwizzleTexture = NULL;

    for (unsigned int level = 0; level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; level++)
    {
        mSwizzleRenderTargets[level] = NULL;
        for (unsigned int face = 0; face < 6; face++)
        {
            mRenderTarget[face][level] = NULL;
        }
    }

    mTextureFormat = gl_d3d11::GetTexFormat(internalformat);
    mShaderResourceFormat = gl_d3d11::GetSRVFormat(internalformat);
    mDepthStencilFormat = gl_d3d11::GetDSVFormat(internalformat);
    mRenderTargetFormat = gl_d3d11::GetRTVFormat(internalformat);
    mSwizzleTextureFormat = gl_d3d11::GetSwizzleTexFormat(internalformat);
    mSwizzleShaderResourceFormat = gl_d3d11::GetSwizzleSRVFormat(internalformat);
    mSwizzleRenderTargetFormat = gl_d3d11::GetSwizzleRTVFormat(internalformat);

    // if the size is not positive this should be treated as an incomplete texture
    // we handle that here by skipping the d3d texture creation
    if (size > 0)
    {
        // adjust size if needed for compressed textures
        int height = size;
        d3d11::MakeValidSize(false, mTextureFormat, &size, &height, &mTopLevel);

        ID3D11Device *device = mRenderer->getDevice();

        D3D11_TEXTURE2D_DESC desc;
        desc.Width = size;
        desc.Height = size;
        desc.MipLevels = ((levels > 0) ? (mTopLevel + levels) : 0);
        desc.ArraySize = 6;
        desc.Format = mTextureFormat;
        desc.SampleDesc.Count = 1;
        desc.SampleDesc.Quality = 0;
        desc.Usage = D3D11_USAGE_DEFAULT;
        desc.BindFlags = getBindFlags();
        desc.CPUAccessFlags = 0;
        desc.MiscFlags = D3D11_RESOURCE_MISC_TEXTURECUBE;

        HRESULT result = device->CreateTexture2D(&desc, NULL, &mTexture);

        if (FAILED(result))
        {
            ASSERT(result == E_OUTOFMEMORY);
            ERR("Creating image failed.");
            gl::error(GL_OUT_OF_MEMORY);
        }
        else
        {
            mTexture->GetDesc(&desc);
            mMipLevels = desc.MipLevels;
            mTextureWidth = desc.Width;
            mTextureHeight = desc.Height;
            mTextureDepth = 1;
        }
    }
}

TextureStorage11_Cube::~TextureStorage11_Cube()
{
    SafeRelease(mTexture);
    SafeRelease(mSwizzleTexture);

    for (unsigned int level = 0; level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; level++)
    {
        SafeRelease(mSwizzleRenderTargets[level]);
        for (unsigned int face = 0; face < 6; face++)
        {
            SafeDelete(mRenderTarget[face][level]);
        }
    }
}

TextureStorage11_Cube *TextureStorage11_Cube::makeTextureStorage11_Cube(TextureStorage *storage)
{
    ASSERT(HAS_DYNAMIC_TYPE(TextureStorage11_Cube*, storage));
    return static_cast<TextureStorage11_Cube*>(storage);
}

ID3D11Resource *TextureStorage11_Cube::getResource() const
{
    return mTexture;
}

RenderTarget *TextureStorage11_Cube::getRenderTargetFace(GLenum faceTarget, int level)
{
    if (level >= 0 && level < getLevelCount())
    {
        int faceIndex = TextureD3D_Cube::targetToIndex(faceTarget);
        if (!mRenderTarget[faceIndex][level])
        {
            ID3D11Device *device = mRenderer->getDevice();
            HRESULT result;

            D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
            srvDesc.Format = mShaderResourceFormat;
            srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2DARRAY; // Will be used with Texture2D sampler, not TextureCube
            srvDesc.Texture2DArray.MostDetailedMip = mTopLevel + level;
            srvDesc.Texture2DArray.MipLevels = 1;
            srvDesc.Texture2DArray.FirstArraySlice = faceIndex;
            srvDesc.Texture2DArray.ArraySize = 1;

            ID3D11ShaderResourceView *srv;
            result = device->CreateShaderResourceView(mTexture, &srvDesc, &srv);

            if (result == E_OUTOFMEMORY)
            {
                return gl::error(GL_OUT_OF_MEMORY, static_cast<RenderTarget*>(NULL));
            }
            ASSERT(SUCCEEDED(result));

            if (mRenderTargetFormat != DXGI_FORMAT_UNKNOWN)
            {
                D3D11_RENDER_TARGET_VIEW_DESC rtvDesc;
                rtvDesc.Format = mRenderTargetFormat;
                rtvDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2DARRAY;
                rtvDesc.Texture2DArray.MipSlice = mTopLevel + level;
                rtvDesc.Texture2DArray.FirstArraySlice = faceIndex;
                rtvDesc.Texture2DArray.ArraySize = 1;

                ID3D11RenderTargetView *rtv;
                result = device->CreateRenderTargetView(mTexture, &rtvDesc, &rtv);

                if (result == E_OUTOFMEMORY)
                {
                    SafeRelease(srv);
                    return gl::error(GL_OUT_OF_MEMORY, static_cast<RenderTarget*>(NULL));
                }
                ASSERT(SUCCEEDED(result));

                mRenderTarget[faceIndex][level] = new RenderTarget11(mRenderer, rtv, mTexture, srv, getLevelWidth(level), getLevelHeight(level), 1);

                // RenderTarget will take ownership of these resources
                SafeRelease(rtv);
                SafeRelease(srv);
            }
            else if (mDepthStencilFormat != DXGI_FORMAT_UNKNOWN)
            {
                D3D11_DEPTH_STENCIL_VIEW_DESC dsvDesc;
                dsvDesc.Format = mDepthStencilFormat;
                dsvDesc.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2DARRAY;
                dsvDesc.Flags = 0;
                dsvDesc.Texture2DArray.MipSlice = mTopLevel + level;
                dsvDesc.Texture2DArray.FirstArraySlice = faceIndex;
                dsvDesc.Texture2DArray.ArraySize = 1;

                ID3D11DepthStencilView *dsv;
                result = device->CreateDepthStencilView(mTexture, &dsvDesc, &dsv);

                if (result == E_OUTOFMEMORY)
                {
                    SafeRelease(srv);
                    return gl::error(GL_OUT_OF_MEMORY, static_cast<RenderTarget*>(NULL));
                }
                ASSERT(SUCCEEDED(result));

                mRenderTarget[faceIndex][level] = new RenderTarget11(mRenderer, dsv, mTexture, srv, getLevelWidth(level), getLevelHeight(level), 1);

                // RenderTarget will take ownership of these resources
                SafeRelease(dsv);
                SafeRelease(srv);
            }
            else
            {
                UNREACHABLE();
            }
        }

        return mRenderTarget[faceIndex][level];
    }
    else
    {
        return NULL;
    }
}

ID3D11ShaderResourceView *TextureStorage11_Cube::createSRV(int baseLevel, int mipLevels, DXGI_FORMAT format, ID3D11Resource *texture)
{
    D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
    srvDesc.Format = format;

    // Unnormalized integer cube maps are not supported by DX11; we emulate them as an array of six 2D textures
    bool unnormalizedInteger = (d3d11::GetComponentType(mTextureFormat) == GL_INT ||
                                d3d11::GetComponentType(mTextureFormat) == GL_UNSIGNED_INT);

    if(unnormalizedInteger)
    {
        srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2DARRAY;
        srvDesc.Texture2DArray.MostDetailedMip = mTopLevel + baseLevel;
        srvDesc.Texture2DArray.MipLevels = 1;
        srvDesc.Texture2DArray.FirstArraySlice = 0;
        srvDesc.Texture2DArray.ArraySize = 6;
    }
    else
    {
        srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURECUBE;
        srvDesc.TextureCube.MipLevels = mipLevels;
        srvDesc.TextureCube.MostDetailedMip = mTopLevel + baseLevel;
    }

    ID3D11ShaderResourceView *SRV = NULL;

    ID3D11Device *device = mRenderer->getDevice();
    HRESULT result = device->CreateShaderResourceView(texture, &srvDesc, &SRV);

    if (result == E_OUTOFMEMORY)
    {
        gl::error(GL_OUT_OF_MEMORY);
    }
    ASSERT(SUCCEEDED(result));

    return SRV;
}

void TextureStorage11_Cube::generateMipmap(int faceIndex, int level)
{
    invalidateSwizzleCacheLevel(level);

    RenderTarget11 *source = RenderTarget11::makeRenderTarget11(getRenderTargetFace(GL_TEXTURE_CUBE_MAP_POSITIVE_X + faceIndex, level - 1));
    RenderTarget11 *dest = RenderTarget11::makeRenderTarget11(getRenderTargetFace(GL_TEXTURE_CUBE_MAP_POSITIVE_X + faceIndex, level));

    generateMipmapLayer(source, dest);
}

ID3D11Resource *TextureStorage11_Cube::getSwizzleTexture()
{
    if (!mSwizzleTexture)
    {
        ID3D11Device *device = mRenderer->getDevice();

        D3D11_TEXTURE2D_DESC desc;
        desc.Width = mTextureWidth;
        desc.Height = mTextureHeight;
        desc.MipLevels = mMipLevels;
        desc.ArraySize = 6;
        desc.Format = mSwizzleTextureFormat;
        desc.SampleDesc.Count = 1;
        desc.SampleDesc.Quality = 0;
        desc.Usage = D3D11_USAGE_DEFAULT;
        desc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_RENDER_TARGET;
        desc.CPUAccessFlags = 0;
        desc.MiscFlags = D3D11_RESOURCE_MISC_TEXTURECUBE;

        HRESULT result = device->CreateTexture2D(&desc, NULL, &mSwizzleTexture);

        if (result == E_OUTOFMEMORY)
        {
            return gl::error(GL_OUT_OF_MEMORY, static_cast<ID3D11Texture2D*>(NULL));
        }
        ASSERT(SUCCEEDED(result));
    }

    return mSwizzleTexture;
}

ID3D11RenderTargetView *TextureStorage11_Cube::getSwizzleRenderTarget(int mipLevel)
{
    if (mipLevel >= 0 && mipLevel < getLevelCount())
    {
        if (!mSwizzleRenderTargets[mipLevel])
        {
            ID3D11Resource *swizzleTexture = getSwizzleTexture();
            if (!swizzleTexture)
            {
                return NULL;
            }

            ID3D11Device *device = mRenderer->getDevice();

            D3D11_RENDER_TARGET_VIEW_DESC rtvDesc;
            rtvDesc.Format = mSwizzleRenderTargetFormat;
            rtvDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2DARRAY;
            rtvDesc.Texture2DArray.MipSlice = mTopLevel + mipLevel;
            rtvDesc.Texture2DArray.FirstArraySlice = 0;
            rtvDesc.Texture2DArray.ArraySize = 6;

            HRESULT result = device->CreateRenderTargetView(mSwizzleTexture, &rtvDesc, &mSwizzleRenderTargets[mipLevel]);

            if (result == E_OUTOFMEMORY)
            {
                return gl::error(GL_OUT_OF_MEMORY, static_cast<ID3D11RenderTargetView*>(NULL));
            }
            ASSERT(SUCCEEDED(result));
        }

        return mSwizzleRenderTargets[mipLevel];
    }
    else
    {
        return NULL;
    }
}

unsigned int TextureStorage11_Cube::getTextureLevelDepth(int mipLevel) const
{
    return 6;
}

TextureStorage11_3D::TextureStorage11_3D(Renderer *renderer, GLenum internalformat, bool renderTarget,
                                         GLsizei width, GLsizei height, GLsizei depth, int levels)
    : TextureStorage11(renderer, GetTextureBindFlags(internalformat, renderTarget))
{
    mTexture = NULL;
    mSwizzleTexture = NULL;

    for (unsigned int i = 0; i < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; i++)
    {
        mLevelRenderTargets[i] = NULL;
        mSwizzleRenderTargets[i] = NULL;
    }

    mTextureFormat = gl_d3d11::GetTexFormat(internalformat);
    mShaderResourceFormat = gl_d3d11::GetSRVFormat(internalformat);
    mDepthStencilFormat = gl_d3d11::GetDSVFormat(internalformat);
    mRenderTargetFormat = gl_d3d11::GetRTVFormat(internalformat);
    mSwizzleTextureFormat = gl_d3d11::GetSwizzleTexFormat(internalformat);
    mSwizzleShaderResourceFormat = gl_d3d11::GetSwizzleSRVFormat(internalformat);
    mSwizzleRenderTargetFormat = gl_d3d11::GetSwizzleRTVFormat(internalformat);

    // If the width, height or depth are not positive this should be treated as an incomplete texture
    // we handle that here by skipping the d3d texture creation
    if (width > 0 && height > 0 && depth > 0)
    {
        // adjust size if needed for compressed textures
        d3d11::MakeValidSize(false, mTextureFormat, &width, &height, &mTopLevel);

        ID3D11Device *device = mRenderer->getDevice();

        D3D11_TEXTURE3D_DESC desc;
        desc.Width = width;
        desc.Height = height;
        desc.Depth = depth;
        desc.MipLevels = ((levels > 0) ? (mTopLevel + levels) : 0);
        desc.Format = mTextureFormat;
        desc.Usage = D3D11_USAGE_DEFAULT;
        desc.BindFlags = getBindFlags();
        desc.CPUAccessFlags = 0;
        desc.MiscFlags = 0;

        HRESULT result = device->CreateTexture3D(&desc, NULL, &mTexture);

        // this can happen from windows TDR
        if (d3d11::isDeviceLostError(result))
        {
            mRenderer->notifyDeviceLost();
            gl::error(GL_OUT_OF_MEMORY);
        }
        else if (FAILED(result))
        {
            ASSERT(result == E_OUTOFMEMORY);
            ERR("Creating image failed.");
            gl::error(GL_OUT_OF_MEMORY);
        }
        else
        {
            mTexture->GetDesc(&desc);
            mMipLevels = desc.MipLevels;
            mTextureWidth = desc.Width;
            mTextureHeight = desc.Height;
            mTextureDepth = desc.Depth;
        }
    }
}

TextureStorage11_3D::~TextureStorage11_3D()
{
    SafeRelease(mTexture);
    SafeRelease(mSwizzleTexture);

    for (RenderTargetMap::iterator i = mLevelLayerRenderTargets.begin(); i != mLevelLayerRenderTargets.end(); i++)
    {
        SafeDelete(i->second);
    }
    mLevelLayerRenderTargets.clear();

    for (unsigned int i = 0; i < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; i++)
    {
        SafeDelete(mLevelRenderTargets[i]);
        SafeRelease(mSwizzleRenderTargets[i]);
    }
}

TextureStorage11_3D *TextureStorage11_3D::makeTextureStorage11_3D(TextureStorage *storage)
{
    ASSERT(HAS_DYNAMIC_TYPE(TextureStorage11_3D*, storage));
    return static_cast<TextureStorage11_3D*>(storage);
}

ID3D11Resource *TextureStorage11_3D::getResource() const
{
    return mTexture;
}

ID3D11ShaderResourceView *TextureStorage11_3D::createSRV(int baseLevel, int mipLevels, DXGI_FORMAT format, ID3D11Resource *texture)
{
    D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
    srvDesc.Format = format;
    srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE3D;
    srvDesc.Texture3D.MostDetailedMip = baseLevel;
    srvDesc.Texture3D.MipLevels = mipLevels;

    ID3D11ShaderResourceView *SRV = NULL;

    ID3D11Device *device = mRenderer->getDevice();
    HRESULT result = device->CreateShaderResourceView(texture, &srvDesc, &SRV);

    if (result == E_OUTOFMEMORY)
    {
        gl::error(GL_OUT_OF_MEMORY);
    }
    ASSERT(SUCCEEDED(result));

    return SRV;
}

RenderTarget *TextureStorage11_3D::getRenderTarget(int mipLevel)
{
    if (mipLevel >= 0 && mipLevel < getLevelCount())
    {
        if (!mLevelRenderTargets[mipLevel])
        {
            ID3D11ShaderResourceView *srv = getSRVLevel(mipLevel);
            if (!srv)
            {
                return NULL;
            }

            if (mRenderTargetFormat != DXGI_FORMAT_UNKNOWN)
            {
                ID3D11Device *device = mRenderer->getDevice();

                D3D11_RENDER_TARGET_VIEW_DESC rtvDesc;
                rtvDesc.Format = mRenderTargetFormat;
                rtvDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE3D;
                rtvDesc.Texture3D.MipSlice = mTopLevel + mipLevel;
                rtvDesc.Texture3D.FirstWSlice = 0;
                rtvDesc.Texture3D.WSize = -1;

                ID3D11RenderTargetView *rtv;
                HRESULT result = device->CreateRenderTargetView(mTexture, &rtvDesc, &rtv);

                if (result == E_OUTOFMEMORY)
                {
                    SafeRelease(srv);
                    return gl::error(GL_OUT_OF_MEMORY, static_cast<RenderTarget*>(NULL));
                }
                ASSERT(SUCCEEDED(result));

                mLevelRenderTargets[mipLevel] = new RenderTarget11(mRenderer, rtv, mTexture, srv, getLevelWidth(mipLevel), getLevelHeight(mipLevel), getLevelDepth(mipLevel));

                // RenderTarget will take ownership of these resources
                SafeRelease(rtv);
            }
            else
            {
                UNREACHABLE();
            }
        }

        return mLevelRenderTargets[mipLevel];
    }
    else
    {
        return NULL;
    }
}

RenderTarget *TextureStorage11_3D::getRenderTargetLayer(int mipLevel, int layer)
{
    if (mipLevel >= 0 && mipLevel < getLevelCount())
    {
        LevelLayerKey key(mipLevel, layer);
        if (mLevelLayerRenderTargets.find(key) == mLevelLayerRenderTargets.end())
        {
            ID3D11Device *device = mRenderer->getDevice();
            HRESULT result;

            // TODO, what kind of SRV is expected here?
            ID3D11ShaderResourceView *srv = NULL;

            if (mRenderTargetFormat != DXGI_FORMAT_UNKNOWN)
            {
                D3D11_RENDER_TARGET_VIEW_DESC rtvDesc;
                rtvDesc.Format = mRenderTargetFormat;
                rtvDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE3D;
                rtvDesc.Texture3D.MipSlice = mTopLevel + mipLevel;
                rtvDesc.Texture3D.FirstWSlice = layer;
                rtvDesc.Texture3D.WSize = 1;

                ID3D11RenderTargetView *rtv;
                result = device->CreateRenderTargetView(mTexture, &rtvDesc, &rtv);

                if (result == E_OUTOFMEMORY)
                {
                    SafeRelease(srv);
                    return gl::error(GL_OUT_OF_MEMORY, static_cast<RenderTarget*>(NULL));
                }
                ASSERT(SUCCEEDED(result));

                mLevelLayerRenderTargets[key] = new RenderTarget11(mRenderer, rtv, mTexture, srv, getLevelWidth(mipLevel), getLevelHeight(mipLevel), 1);

                // RenderTarget will take ownership of these resources
                SafeRelease(rtv);
                SafeRelease(srv);
            }
            else
            {
                UNREACHABLE();
            }
        }

        return mLevelLayerRenderTargets[key];
    }
    else
    {
        return NULL;
    }
}

void TextureStorage11_3D::generateMipmap(int level)
{
    invalidateSwizzleCacheLevel(level);

    RenderTarget11 *source = RenderTarget11::makeRenderTarget11(getRenderTarget(level - 1));
    RenderTarget11 *dest = RenderTarget11::makeRenderTarget11(getRenderTarget(level));

    generateMipmapLayer(source, dest);
}

ID3D11Resource *TextureStorage11_3D::getSwizzleTexture()
{
    if (!mSwizzleTexture)
    {
        ID3D11Device *device = mRenderer->getDevice();

        D3D11_TEXTURE3D_DESC desc;
        desc.Width = mTextureWidth;
        desc.Height = mTextureHeight;
        desc.Depth = mTextureDepth;
        desc.MipLevels = mMipLevels;
        desc.Format = mSwizzleTextureFormat;
        desc.Usage = D3D11_USAGE_DEFAULT;
        desc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_RENDER_TARGET;
        desc.CPUAccessFlags = 0;
        desc.MiscFlags = 0;

        HRESULT result = device->CreateTexture3D(&desc, NULL, &mSwizzleTexture);

        if (result == E_OUTOFMEMORY)
        {
            return gl::error(GL_OUT_OF_MEMORY, static_cast<ID3D11Texture3D*>(NULL));
        }
        ASSERT(SUCCEEDED(result));
    }

    return mSwizzleTexture;
}

ID3D11RenderTargetView *TextureStorage11_3D::getSwizzleRenderTarget(int mipLevel)
{
    if (mipLevel >= 0 && mipLevel < getLevelCount())
    {
        if (!mSwizzleRenderTargets[mipLevel])
        {
            ID3D11Resource *swizzleTexture = getSwizzleTexture();
            if (!swizzleTexture)
            {
                return NULL;
            }

            ID3D11Device *device = mRenderer->getDevice();

            D3D11_RENDER_TARGET_VIEW_DESC rtvDesc;
            rtvDesc.Format = mSwizzleRenderTargetFormat;
            rtvDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE3D;
            rtvDesc.Texture3D.MipSlice = mTopLevel + mipLevel;
            rtvDesc.Texture3D.FirstWSlice = 0;
            rtvDesc.Texture3D.WSize = -1;

            HRESULT result = device->CreateRenderTargetView(mSwizzleTexture, &rtvDesc, &mSwizzleRenderTargets[mipLevel]);

            if (result == E_OUTOFMEMORY)
            {
                return gl::error(GL_OUT_OF_MEMORY, static_cast<ID3D11RenderTargetView*>(NULL));
            }
            ASSERT(SUCCEEDED(result));
        }

        return mSwizzleRenderTargets[mipLevel];
    }
    else
    {
        return NULL;
    }
}

unsigned int TextureStorage11_3D::getTextureLevelDepth(int mipLevel) const
{
    return std::max(mTextureDepth >> mipLevel, 1U);
}


TextureStorage11_2DArray::TextureStorage11_2DArray(Renderer *renderer, GLenum internalformat, bool renderTarget,
                                                   GLsizei width, GLsizei height, GLsizei depth, int levels)
    : TextureStorage11(renderer, GetTextureBindFlags(internalformat, renderTarget))
{
    mTexture = NULL;
    mSwizzleTexture = NULL;

    for (unsigned int level = 0; level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; level++)
    {
        mSwizzleRenderTargets[level] = NULL;
    }

    mTextureFormat = gl_d3d11::GetTexFormat(internalformat);
    mShaderResourceFormat = gl_d3d11::GetSRVFormat(internalformat);
    mDepthStencilFormat = gl_d3d11::GetDSVFormat(internalformat);
    mRenderTargetFormat = gl_d3d11::GetRTVFormat(internalformat);
    mSwizzleTextureFormat = gl_d3d11::GetSwizzleTexFormat(internalformat);
    mSwizzleShaderResourceFormat = gl_d3d11::GetSwizzleSRVFormat(internalformat);
    mSwizzleRenderTargetFormat = gl_d3d11::GetSwizzleRTVFormat(internalformat);

    // if the width, height or depth is not positive this should be treated as an incomplete texture
    // we handle that here by skipping the d3d texture creation
    if (width > 0 && height > 0 && depth > 0)
    {
        // adjust size if needed for compressed textures
        d3d11::MakeValidSize(false, mTextureFormat, &width, &height, &mTopLevel);

        ID3D11Device *device = mRenderer->getDevice();

        D3D11_TEXTURE2D_DESC desc;
        desc.Width = width;
        desc.Height = height;
        desc.MipLevels = ((levels > 0) ? (mTopLevel + levels) : 0);
        desc.ArraySize = depth;
        desc.Format = mTextureFormat;
        desc.SampleDesc.Count = 1;
        desc.SampleDesc.Quality = 0;
        desc.Usage = D3D11_USAGE_DEFAULT;
        desc.BindFlags = getBindFlags();
        desc.CPUAccessFlags = 0;
        desc.MiscFlags = 0;

        HRESULT result = device->CreateTexture2D(&desc, NULL, &mTexture);

        // this can happen from windows TDR
        if (d3d11::isDeviceLostError(result))
        {
            mRenderer->notifyDeviceLost();
            gl::error(GL_OUT_OF_MEMORY);
        }
        else if (FAILED(result))
        {
            ASSERT(result == E_OUTOFMEMORY);
            ERR("Creating image failed.");
            gl::error(GL_OUT_OF_MEMORY);
        }
        else
        {
            mTexture->GetDesc(&desc);
            mMipLevels = desc.MipLevels;
            mTextureWidth = desc.Width;
            mTextureHeight = desc.Height;
            mTextureDepth = desc.ArraySize;
        }
    }
}

TextureStorage11_2DArray::~TextureStorage11_2DArray()
{
    SafeRelease(mTexture);
    SafeRelease(mSwizzleTexture);

    for (unsigned int level = 0; level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; level++)
    {
        SafeRelease(mSwizzleRenderTargets[level]);
    }

    for (RenderTargetMap::iterator i = mRenderTargets.begin(); i != mRenderTargets.end(); i++)
    {
        SafeDelete(i->second);
    }
    mRenderTargets.clear();
}

TextureStorage11_2DArray *TextureStorage11_2DArray::makeTextureStorage11_2DArray(TextureStorage *storage)
{
    ASSERT(HAS_DYNAMIC_TYPE(TextureStorage11_2DArray*, storage));
    return static_cast<TextureStorage11_2DArray*>(storage);
}

ID3D11Resource *TextureStorage11_2DArray::getResource() const
{
    return mTexture;
}

ID3D11ShaderResourceView *TextureStorage11_2DArray::createSRV(int baseLevel, int mipLevels, DXGI_FORMAT format, ID3D11Resource *texture)
{
    D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
    srvDesc.Format = format;
    srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2DARRAY;
    srvDesc.Texture2DArray.MostDetailedMip = mTopLevel + baseLevel;
    srvDesc.Texture2DArray.MipLevels = mipLevels;
    srvDesc.Texture2DArray.FirstArraySlice = 0;
    srvDesc.Texture2DArray.ArraySize = mTextureDepth;

    ID3D11ShaderResourceView *SRV = NULL;

    ID3D11Device *device = mRenderer->getDevice();
    HRESULT result = device->CreateShaderResourceView(texture, &srvDesc, &SRV);

    if (result == E_OUTOFMEMORY)
    {
        gl::error(GL_OUT_OF_MEMORY);
    }
    ASSERT(SUCCEEDED(result));

    return SRV;
}

RenderTarget *TextureStorage11_2DArray::getRenderTargetLayer(int mipLevel, int layer)
{
    if (mipLevel >= 0 && mipLevel < getLevelCount())
    {
        LevelLayerKey key(mipLevel, layer);
        if (mRenderTargets.find(key) == mRenderTargets.end())
        {
            ID3D11Device *device = mRenderer->getDevice();
            HRESULT result;

            D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
            srvDesc.Format = mShaderResourceFormat;
            srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2DARRAY;
            srvDesc.Texture2DArray.MostDetailedMip = mTopLevel + mipLevel;
            srvDesc.Texture2DArray.MipLevels = 1;
            srvDesc.Texture2DArray.FirstArraySlice = layer;
            srvDesc.Texture2DArray.ArraySize = 1;

            ID3D11ShaderResourceView *srv;
            result = device->CreateShaderResourceView(mTexture, &srvDesc, &srv);

            if (result == E_OUTOFMEMORY)
            {
                return gl::error(GL_OUT_OF_MEMORY, static_cast<RenderTarget*>(NULL));
            }
            ASSERT(SUCCEEDED(result));

            if (mRenderTargetFormat != DXGI_FORMAT_UNKNOWN)
            {
                D3D11_RENDER_TARGET_VIEW_DESC rtvDesc;
                rtvDesc.Format = mRenderTargetFormat;
                rtvDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2DARRAY;
                rtvDesc.Texture2DArray.MipSlice = mTopLevel + mipLevel;
                rtvDesc.Texture2DArray.FirstArraySlice = layer;
                rtvDesc.Texture2DArray.ArraySize = 1;

                ID3D11RenderTargetView *rtv;
                result = device->CreateRenderTargetView(mTexture, &rtvDesc, &rtv);

                if (result == E_OUTOFMEMORY)
                {
                    SafeRelease(srv);
                    return gl::error(GL_OUT_OF_MEMORY, static_cast<RenderTarget*>(NULL));
                }
                ASSERT(SUCCEEDED(result));

                mRenderTargets[key] = new RenderTarget11(mRenderer, rtv, mTexture, srv, getLevelWidth(mipLevel), getLevelHeight(mipLevel), 1);

                // RenderTarget will take ownership of these resources
                SafeRelease(rtv);
                SafeRelease(srv);
            }
            else
            {
                UNREACHABLE();
            }
        }

        return mRenderTargets[key];
    }
    else
    {
        return NULL;
    }
}

void TextureStorage11_2DArray::generateMipmap(int level)
{
    invalidateSwizzleCacheLevel(level);
    for (unsigned int layer = 0; layer < mTextureDepth; layer++)
    {
        RenderTarget11 *source = RenderTarget11::makeRenderTarget11(getRenderTargetLayer(level - 1, layer));
        RenderTarget11 *dest = RenderTarget11::makeRenderTarget11(getRenderTargetLayer(level, layer));

        generateMipmapLayer(source, dest);
    }
}

ID3D11Resource *TextureStorage11_2DArray::getSwizzleTexture()
{
    if (!mSwizzleTexture)
    {
        ID3D11Device *device = mRenderer->getDevice();

        D3D11_TEXTURE2D_DESC desc;
        desc.Width = mTextureWidth;
        desc.Height = mTextureHeight;
        desc.MipLevels = mMipLevels;
        desc.ArraySize = mTextureDepth;
        desc.Format = mSwizzleTextureFormat;
        desc.SampleDesc.Count = 1;
        desc.SampleDesc.Quality = 0;
        desc.Usage = D3D11_USAGE_DEFAULT;
        desc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_RENDER_TARGET;
        desc.CPUAccessFlags = 0;
        desc.MiscFlags = 0;

        HRESULT result = device->CreateTexture2D(&desc, NULL, &mSwizzleTexture);

        if (result == E_OUTOFMEMORY)
        {
            return gl::error(GL_OUT_OF_MEMORY, static_cast<ID3D11Texture2D*>(NULL));
        }
        ASSERT(SUCCEEDED(result));
    }

    return mSwizzleTexture;
}

ID3D11RenderTargetView *TextureStorage11_2DArray::getSwizzleRenderTarget(int mipLevel)
{
    if (mipLevel >= 0 && mipLevel < getLevelCount())
    {
        if (!mSwizzleRenderTargets[mipLevel])
        {
            ID3D11Resource *swizzleTexture = getSwizzleTexture();
            if (!swizzleTexture)
            {
                return NULL;
            }

            ID3D11Device *device = mRenderer->getDevice();

            D3D11_RENDER_TARGET_VIEW_DESC rtvDesc;
            rtvDesc.Format = mSwizzleRenderTargetFormat;
            rtvDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2DARRAY;
            rtvDesc.Texture2DArray.MipSlice = mTopLevel + mipLevel;
            rtvDesc.Texture2DArray.FirstArraySlice = 0;
            rtvDesc.Texture2DArray.ArraySize = mTextureDepth;

            HRESULT result = device->CreateRenderTargetView(mSwizzleTexture, &rtvDesc, &mSwizzleRenderTargets[mipLevel]);

            if (result == E_OUTOFMEMORY)
            {
                return gl::error(GL_OUT_OF_MEMORY, static_cast<ID3D11RenderTargetView*>(NULL));
            }
            ASSERT(SUCCEEDED(result));
        }

        return mSwizzleRenderTargets[mipLevel];
    }
    else
    {
        return NULL;
    }
}

unsigned int TextureStorage11_2DArray::getTextureLevelDepth(int mipLevel) const
{
    return mTextureDepth;
}

}