//
// Copyright (c) 2002-2012 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.
//

// Texture.cpp: Implements the gl::Texture class and its derived classes
// Texture2D and TextureCubeMap. Implements GL texture objects and related
// functionality. [OpenGL ES 2.0.24] section 3.7 page 63.

#include "libGLESv2/Texture.h"

#include <algorithm>

#include "common/debug.h"

#include "libEGL/Display.h"

#include "libGLESv2/main.h"
#include "libGLESv2/mathutil.h"
#include "libGLESv2/utilities.h"
#include "libGLESv2/Blit.h"
#include "libGLESv2/Framebuffer.h"

namespace gl
{
unsigned int TextureStorage::mCurrentTextureSerial = 1;

static D3DFORMAT ConvertTextureInternalFormat(GLint internalformat)
{
    switch (internalformat)
    {
      case GL_DEPTH_COMPONENT16:
      case GL_DEPTH_COMPONENT32_OES:
      case GL_DEPTH24_STENCIL8_OES:
        return D3DFMT_INTZ;
      case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
      case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
        return D3DFMT_DXT1;
      case GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE:
        return D3DFMT_DXT3;
      case GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE:
        return D3DFMT_DXT5;
      case GL_RGBA32F_EXT:
      case GL_RGB32F_EXT:
      case GL_ALPHA32F_EXT:
      case GL_LUMINANCE32F_EXT:
      case GL_LUMINANCE_ALPHA32F_EXT:
        return D3DFMT_A32B32G32R32F;
      case GL_RGBA16F_EXT:
      case GL_RGB16F_EXT:
      case GL_ALPHA16F_EXT:
      case GL_LUMINANCE16F_EXT:
      case GL_LUMINANCE_ALPHA16F_EXT:
        return D3DFMT_A16B16G16R16F;
      case GL_LUMINANCE8_EXT:
        if (getContext()->supportsLuminanceTextures())
        {
            return D3DFMT_L8;
        }
        break;
      case GL_LUMINANCE8_ALPHA8_EXT:
        if (getContext()->supportsLuminanceAlphaTextures())
        {
            return D3DFMT_A8L8;
        }
        break;
      case GL_RGB8_OES:
      case GL_RGB565:
        return D3DFMT_X8R8G8B8;
    }

    return D3DFMT_A8R8G8B8;
}

static bool IsTextureFormatRenderable(D3DFORMAT format)
{
    if (format == D3DFMT_INTZ)
    {
        return true;
    }
    switch(format)
    {
      case D3DFMT_L8:
      case D3DFMT_A8L8:
      case D3DFMT_DXT1:
      case D3DFMT_DXT3:
      case D3DFMT_DXT5:
        return false;
      case D3DFMT_A8R8G8B8:
      case D3DFMT_X8R8G8B8:
      case D3DFMT_A16B16G16R16F:
      case D3DFMT_A32B32G32R32F:
        return true;
      default:
        UNREACHABLE();
    }

    return false;
}

static inline DWORD GetTextureUsage(D3DFORMAT d3dfmt, GLenum glusage, bool forceRenderable)
{
    DWORD d3dusage = 0;

    if (d3dfmt == D3DFMT_INTZ)
    {
        d3dusage |= D3DUSAGE_DEPTHSTENCIL;
    }
    else if(forceRenderable || (IsTextureFormatRenderable(d3dfmt) && (glusage == GL_FRAMEBUFFER_ATTACHMENT_ANGLE)))
    {
        d3dusage |= D3DUSAGE_RENDERTARGET;
    }
    return d3dusage;
}

static void MakeValidSize(bool isImage, bool isCompressed, GLsizei *requestWidth, GLsizei *requestHeight, int *levelOffset)
{
    int upsampleCount = 0;

    if (isCompressed)
    {
        // Don't expand the size of full textures that are at least 4x4
        // already.
        if (isImage || *requestWidth < 4 || *requestHeight < 4)
        {
            while (*requestWidth % 4 != 0 || *requestHeight % 4 != 0)
            {
                *requestWidth <<= 1;
                *requestHeight <<= 1;
                upsampleCount++;
            }
        }
    }
    *levelOffset = upsampleCount;
}

static void CopyLockableSurfaces(IDirect3DSurface9 *dest, IDirect3DSurface9 *source)
{
    D3DLOCKED_RECT sourceLock = {0};
    D3DLOCKED_RECT destLock = {0};
    
    source->LockRect(&sourceLock, NULL, 0);
    dest->LockRect(&destLock, NULL, 0);
    
    if (sourceLock.pBits && destLock.pBits)
    {
        D3DSURFACE_DESC desc;
        source->GetDesc(&desc);

        int rows = dx::IsCompressedFormat(desc.Format) ? desc.Height / 4 : desc.Height;
        int bytes = dx::ComputeRowSize(desc.Format, desc.Width);
        ASSERT(bytes <= sourceLock.Pitch && bytes <= destLock.Pitch);

        for(int i = 0; i < rows; i++)
        {
            memcpy((char*)destLock.pBits + destLock.Pitch * i, (char*)sourceLock.pBits + sourceLock.Pitch * i, bytes);
        }

        source->UnlockRect();
        dest->UnlockRect();
    }
    else UNREACHABLE();
}

Image::Image()
{
    mWidth = 0; 
    mHeight = 0;
    mInternalFormat = GL_NONE;

    mSurface = NULL;

    mDirty = false;

    mD3DPool = D3DPOOL_SYSTEMMEM;
    mD3DFormat = D3DFMT_UNKNOWN;
}

Image::~Image()
{
    if (mSurface)
    {
        mSurface->Release();
    }
}

bool Image::redefine(GLint internalformat, GLsizei width, GLsizei height, bool forceRelease)
{
    if (mWidth != width ||
        mHeight != height ||
        mInternalFormat != internalformat ||
        forceRelease)
    {
        mWidth = width;
        mHeight = height;
        mInternalFormat = internalformat;
        // compute the d3d format that will be used
        mD3DFormat = ConvertTextureInternalFormat(internalformat);

        if (mSurface)
        {
            mSurface->Release();
            mSurface = NULL;
        }

        return true;
    }

    return false;
}

void Image::createSurface()
{
    if(mSurface)
    {
        return;
    }

    IDirect3DTexture9 *newTexture = NULL;
    IDirect3DSurface9 *newSurface = NULL;
    const D3DPOOL poolToUse = D3DPOOL_SYSTEMMEM;
    const D3DFORMAT d3dFormat = getD3DFormat();
    ASSERT(d3dFormat != D3DFMT_INTZ); // We should never get here for depth textures

    if (mWidth != 0 && mHeight != 0)
    {
        int levelToFetch = 0;
        GLsizei requestWidth = mWidth;
        GLsizei requestHeight = mHeight;
        MakeValidSize(true, IsCompressed(mInternalFormat), &requestWidth, &requestHeight, &levelToFetch);

        HRESULT result = getDevice()->CreateTexture(requestWidth, requestHeight, levelToFetch + 1, 0, d3dFormat,
                                                    poolToUse, &newTexture, NULL);

        if (FAILED(result))
        {
            ASSERT(result == D3DERR_OUTOFVIDEOMEMORY || result == E_OUTOFMEMORY);
            ERR("Creating image surface failed.");
            return error(GL_OUT_OF_MEMORY);
        }

        newTexture->GetSurfaceLevel(levelToFetch, &newSurface);
        newTexture->Release();
    }

    mSurface = newSurface;
    mDirty = false;
    mD3DPool = poolToUse;
}

HRESULT Image::lock(D3DLOCKED_RECT *lockedRect, const RECT *rect)
{
    createSurface();

    HRESULT result = D3DERR_INVALIDCALL;

    if (mSurface)
    {
        result = mSurface->LockRect(lockedRect, rect, 0);
        ASSERT(SUCCEEDED(result));

        mDirty = true;
    }

    return result;
}

void Image::unlock()
{
    if (mSurface)
    {
        HRESULT result = mSurface->UnlockRect();
        ASSERT(SUCCEEDED(result));
    }
}

bool Image::isRenderableFormat() const
{    
    return IsTextureFormatRenderable(getD3DFormat());
}

D3DFORMAT Image::getD3DFormat() const
{
    // this should only happen if the image hasn't been redefined first
    // which would be a bug by the caller
    ASSERT(mD3DFormat != D3DFMT_UNKNOWN);

    return mD3DFormat;
}

IDirect3DSurface9 *Image::getSurface()
{
    createSurface();

    return mSurface;
}

void Image::setManagedSurface(IDirect3DSurface9 *surface)
{
    D3DSURFACE_DESC desc;
    surface->GetDesc(&desc);
    ASSERT(desc.Pool == D3DPOOL_MANAGED);

    if ((GLsizei)desc.Width == mWidth && (GLsizei)desc.Height == mHeight)
    {
        if (mSurface)
        {
            CopyLockableSurfaces(surface, mSurface);
            mSurface->Release();
        }

        mSurface = surface;
        mD3DPool = desc.Pool;
    }
}

void Image::updateSurface(IDirect3DSurface9 *destSurface, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height)
{
    IDirect3DSurface9 *sourceSurface = getSurface();

    if (sourceSurface && sourceSurface != destSurface)
    {
        RECT rect;
        rect.left = xoffset;
        rect.top = yoffset;
        rect.right = xoffset + width;
        rect.bottom = yoffset + height;

        POINT point = {rect.left, rect.top};

        if (mD3DPool == D3DPOOL_MANAGED)
        {
            D3DSURFACE_DESC desc;
            sourceSurface->GetDesc(&desc);

            IDirect3DSurface9 *surf = 0;
            HRESULT result = getDevice()->CreateOffscreenPlainSurface(desc.Width, desc.Height, desc.Format, D3DPOOL_SYSTEMMEM, &surf, NULL);

            if (SUCCEEDED(result))
            {
                CopyLockableSurfaces(surf, sourceSurface);
                result = getDevice()->UpdateSurface(surf, &rect, destSurface, &point);
                ASSERT(SUCCEEDED(result));
                surf->Release();
            }
        }
        else
        {
            // UpdateSurface: source must be SYSTEMMEM, dest must be DEFAULT pools
            HRESULT result = getDevice()->UpdateSurface(sourceSurface, &rect, destSurface, &point);
            ASSERT(SUCCEEDED(result));
        }
    }
}

// Store the pixel rectangle designated by xoffset,yoffset,width,height with pixels stored as format/type at input
// into the target pixel rectangle.
void Image::loadData(GLint xoffset, GLint yoffset, GLsizei width, GLsizei height,
                     GLint unpackAlignment, const void *input)
{
    RECT lockRect =
    {
        xoffset, yoffset,
        xoffset + width, yoffset + height
    };

    D3DLOCKED_RECT locked;
    HRESULT result = lock(&locked, &lockRect);
    if (FAILED(result))
    {
        return;
    }


    GLsizei inputPitch = ComputePitch(width, mInternalFormat, unpackAlignment);

    switch (mInternalFormat)
    {
      case GL_ALPHA8_EXT:
        if (supportsSSE2())
        {
            loadAlphaDataSSE2(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        }
        else
        {
            loadAlphaData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        }
        break;
      case GL_LUMINANCE8_EXT:
        loadLuminanceData(width, height, inputPitch, input, locked.Pitch, locked.pBits, getD3DFormat() == D3DFMT_L8);
        break;
      case GL_ALPHA32F_EXT:
        loadAlphaFloatData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_LUMINANCE32F_EXT:
        loadLuminanceFloatData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_ALPHA16F_EXT:
        loadAlphaHalfFloatData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_LUMINANCE16F_EXT:
        loadLuminanceHalfFloatData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_LUMINANCE8_ALPHA8_EXT:
        loadLuminanceAlphaData(width, height, inputPitch, input, locked.Pitch, locked.pBits, getD3DFormat() == D3DFMT_A8L8);
        break;
      case GL_LUMINANCE_ALPHA32F_EXT:
        loadLuminanceAlphaFloatData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_LUMINANCE_ALPHA16F_EXT:
        loadLuminanceAlphaHalfFloatData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGB8_OES:
        loadRGBUByteData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGB565:
        loadRGB565Data(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGBA8_OES:
        if (supportsSSE2())
        {
            loadRGBAUByteDataSSE2(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        }
        else
        {
            loadRGBAUByteData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        }
        break;
      case GL_RGBA4:
        loadRGBA4444Data(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGB5_A1:
        loadRGBA5551Data(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_BGRA8_EXT:
        loadBGRAData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      // float textures are converted to RGBA, not BGRA, as they're stored that way in D3D
      case GL_RGB32F_EXT:
        loadRGBFloatData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGB16F_EXT:
        loadRGBHalfFloatData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGBA32F_EXT:
        loadRGBAFloatData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGBA16F_EXT:
        loadRGBAHalfFloatData(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      default: UNREACHABLE(); 
    }

    unlock();
}

void Image::loadAlphaData(GLsizei width, GLsizei height,
                          int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const unsigned char *source = NULL;
    unsigned char *dest = NULL;
    
    for (int y = 0; y < height; y++)
    {
        source = static_cast<const unsigned char*>(input) + y * inputPitch;
        dest = static_cast<unsigned char*>(output) + y * outputPitch;
        for (int x = 0; x < width; x++)
        {
            dest[4 * x + 0] = 0;
            dest[4 * x + 1] = 0;
            dest[4 * x + 2] = 0;
            dest[4 * x + 3] = source[x];
        }
    }
}

void Image::loadAlphaFloatData(GLsizei width, GLsizei height,
                               int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const float *source = NULL;
    float *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = reinterpret_cast<const float*>(static_cast<const unsigned char*>(input) + y * inputPitch);
        dest = reinterpret_cast<float*>(static_cast<unsigned char*>(output) + y * outputPitch);
        for (int x = 0; x < width; x++)
        {
            dest[4 * x + 0] = 0;
            dest[4 * x + 1] = 0;
            dest[4 * x + 2] = 0;
            dest[4 * x + 3] = source[x];
        }
    }
}

void Image::loadAlphaHalfFloatData(GLsizei width, GLsizei height,
                                   int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const unsigned short *source = NULL;
    unsigned short *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = reinterpret_cast<const unsigned short*>(static_cast<const unsigned char*>(input) + y * inputPitch);
        dest = reinterpret_cast<unsigned short*>(static_cast<unsigned char*>(output) + y * outputPitch);
        for (int x = 0; x < width; x++)
        {
            dest[4 * x + 0] = 0;
            dest[4 * x + 1] = 0;
            dest[4 * x + 2] = 0;
            dest[4 * x + 3] = source[x];
        }
    }
}

void Image::loadLuminanceData(GLsizei width, GLsizei height,
                              int inputPitch, const void *input, size_t outputPitch, void *output, bool native) const
{
    const unsigned char *source = NULL;
    unsigned char *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = static_cast<const unsigned char*>(input) + y * inputPitch;
        dest = static_cast<unsigned char*>(output) + y * outputPitch;

        if (!native)   // BGRA8 destination format
        {
            for (int x = 0; x < width; x++)
            {
                dest[4 * x + 0] = source[x];
                dest[4 * x + 1] = source[x];
                dest[4 * x + 2] = source[x];
                dest[4 * x + 3] = 0xFF;
            }
        }
        else   // L8 destination format
        {
            memcpy(dest, source, width);
        }
    }
}

void Image::loadLuminanceFloatData(GLsizei width, GLsizei height,
                                   int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const float *source = NULL;
    float *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = reinterpret_cast<const float*>(static_cast<const unsigned char*>(input) + y * inputPitch);
        dest = reinterpret_cast<float*>(static_cast<unsigned char*>(output) + y * outputPitch);
        for (int x = 0; x < width; x++)
        {
            dest[4 * x + 0] = source[x];
            dest[4 * x + 1] = source[x];
            dest[4 * x + 2] = source[x];
            dest[4 * x + 3] = 1.0f;
        }
    }
}

void Image::loadLuminanceHalfFloatData(GLsizei width, GLsizei height,
                                       int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const unsigned short *source = NULL;
    unsigned short *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = reinterpret_cast<const unsigned short*>(static_cast<const unsigned char*>(input) + y * inputPitch);
        dest = reinterpret_cast<unsigned short*>(static_cast<unsigned char*>(output) + y * outputPitch);
        for (int x = 0; x < width; x++)
        {
            dest[4 * x + 0] = source[x];
            dest[4 * x + 1] = source[x];
            dest[4 * x + 2] = source[x];
            dest[4 * x + 3] = 0x3C00; // SEEEEEMMMMMMMMMM, S = 0, E = 15, M = 0: 16bit flpt representation of 1
        }
    }
}

void Image::loadLuminanceAlphaData(GLsizei width, GLsizei height,
                                   int inputPitch, const void *input, size_t outputPitch, void *output, bool native) const
{
    const unsigned char *source = NULL;
    unsigned char *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = static_cast<const unsigned char*>(input) + y * inputPitch;
        dest = static_cast<unsigned char*>(output) + y * outputPitch;
        
        if (!native)   // BGRA8 destination format
        {
            for (int x = 0; x < width; x++)
            {
                dest[4 * x + 0] = source[2*x+0];
                dest[4 * x + 1] = source[2*x+0];
                dest[4 * x + 2] = source[2*x+0];
                dest[4 * x + 3] = source[2*x+1];
            }
        }
        else
        {
            memcpy(dest, source, width * 2);
        }
    }
}

void Image::loadLuminanceAlphaFloatData(GLsizei width, GLsizei height,
                                        int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const float *source = NULL;
    float *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = reinterpret_cast<const float*>(static_cast<const unsigned char*>(input) + y * inputPitch);
        dest = reinterpret_cast<float*>(static_cast<unsigned char*>(output) + y * outputPitch);
        for (int x = 0; x < width; x++)
        {
            dest[4 * x + 0] = source[2*x+0];
            dest[4 * x + 1] = source[2*x+0];
            dest[4 * x + 2] = source[2*x+0];
            dest[4 * x + 3] = source[2*x+1];
        }
    }
}

void Image::loadLuminanceAlphaHalfFloatData(GLsizei width, GLsizei height,
                                            int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const unsigned short *source = NULL;
    unsigned short *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = reinterpret_cast<const unsigned short*>(static_cast<const unsigned char*>(input) + y * inputPitch);
        dest = reinterpret_cast<unsigned short*>(static_cast<unsigned char*>(output) + y * outputPitch);
        for (int x = 0; x < width; x++)
        {
            dest[4 * x + 0] = source[2*x+0];
            dest[4 * x + 1] = source[2*x+0];
            dest[4 * x + 2] = source[2*x+0];
            dest[4 * x + 3] = source[2*x+1];
        }
    }
}

void Image::loadRGBUByteData(GLsizei width, GLsizei height,
                             int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const unsigned char *source = NULL;
    unsigned char *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = static_cast<const unsigned char*>(input) + y * inputPitch;
        dest = static_cast<unsigned char*>(output) + y * outputPitch;
        for (int x = 0; x < width; x++)
        {
            dest[4 * x + 0] = source[x * 3 + 2];
            dest[4 * x + 1] = source[x * 3 + 1];
            dest[4 * x + 2] = source[x * 3 + 0];
            dest[4 * x + 3] = 0xFF;
        }
    }
}

void Image::loadRGB565Data(GLsizei width, GLsizei height,
                           int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const unsigned short *source = NULL;
    unsigned char *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = reinterpret_cast<const unsigned short*>(static_cast<const unsigned char*>(input) + y * inputPitch);
        dest = static_cast<unsigned char*>(output) + y * outputPitch;
        for (int x = 0; x < width; x++)
        {
            unsigned short rgba = source[x];
            dest[4 * x + 0] = ((rgba & 0x001F) << 3) | ((rgba & 0x001F) >> 2);
            dest[4 * x + 1] = ((rgba & 0x07E0) >> 3) | ((rgba & 0x07E0) >> 9);
            dest[4 * x + 2] = ((rgba & 0xF800) >> 8) | ((rgba & 0xF800) >> 13);
            dest[4 * x + 3] = 0xFF;
        }
    }
}

void Image::loadRGBFloatData(GLsizei width, GLsizei height,
                             int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const float *source = NULL;
    float *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = reinterpret_cast<const float*>(static_cast<const unsigned char*>(input) + y * inputPitch);
        dest = reinterpret_cast<float*>(static_cast<unsigned char*>(output) + y * outputPitch);
        for (int x = 0; x < width; x++)
        {
            dest[4 * x + 0] = source[x * 3 + 0];
            dest[4 * x + 1] = source[x * 3 + 1];
            dest[4 * x + 2] = source[x * 3 + 2];
            dest[4 * x + 3] = 1.0f;
        }
    }
}

void Image::loadRGBHalfFloatData(GLsizei width, GLsizei height,
                                 int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const unsigned short *source = NULL;
    unsigned short *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = reinterpret_cast<const unsigned short*>(static_cast<const unsigned char*>(input) + y * inputPitch);
        dest = reinterpret_cast<unsigned short*>(static_cast<unsigned char*>(output) + y * outputPitch);
        for (int x = 0; x < width; x++)
        {
            dest[4 * x + 0] = source[x * 3 + 0];
            dest[4 * x + 1] = source[x * 3 + 1];
            dest[4 * x + 2] = source[x * 3 + 2];
            dest[4 * x + 3] = 0x3C00; // SEEEEEMMMMMMMMMM, S = 0, E = 15, M = 0: 16bit flpt representation of 1
        }
    }
}

void Image::loadRGBAUByteData(GLsizei width, GLsizei height,
                              int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const unsigned int *source = NULL;
    unsigned int *dest = NULL;
    for (int y = 0; y < height; y++)
    {
        source = reinterpret_cast<const unsigned int*>(static_cast<const unsigned char*>(input) + y * inputPitch);
        dest = reinterpret_cast<unsigned int*>(static_cast<unsigned char*>(output) + y * outputPitch);

        for (int x = 0; x < width; x++)
        {
            unsigned int rgba = source[x];
            dest[x] = (_rotl(rgba, 16) & 0x00ff00ff) | (rgba & 0xff00ff00);
        }
    }
}

void Image::loadRGBA4444Data(GLsizei width, GLsizei height,
                             int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const unsigned short *source = NULL;
    unsigned char *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = reinterpret_cast<const unsigned short*>(static_cast<const unsigned char*>(input) + y * inputPitch);
        dest = static_cast<unsigned char*>(output) + y * outputPitch;
        for (int x = 0; x < width; x++)
        {
            unsigned short rgba = source[x];
            dest[4 * x + 0] = ((rgba & 0x00F0) << 0) | ((rgba & 0x00F0) >> 4);
            dest[4 * x + 1] = ((rgba & 0x0F00) >> 4) | ((rgba & 0x0F00) >> 8);
            dest[4 * x + 2] = ((rgba & 0xF000) >> 8) | ((rgba & 0xF000) >> 12);
            dest[4 * x + 3] = ((rgba & 0x000F) << 4) | ((rgba & 0x000F) >> 0);
        }
    }
}

void Image::loadRGBA5551Data(GLsizei width, GLsizei height,
                             int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const unsigned short *source = NULL;
    unsigned char *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = reinterpret_cast<const unsigned short*>(static_cast<const unsigned char*>(input) + y * inputPitch);
        dest = static_cast<unsigned char*>(output) + y * outputPitch;
        for (int x = 0; x < width; x++)
        {
            unsigned short rgba = source[x];
            dest[4 * x + 0] = ((rgba & 0x003E) << 2) | ((rgba & 0x003E) >> 3);
            dest[4 * x + 1] = ((rgba & 0x07C0) >> 3) | ((rgba & 0x07C0) >> 8);
            dest[4 * x + 2] = ((rgba & 0xF800) >> 8) | ((rgba & 0xF800) >> 13);
            dest[4 * x + 3] = (rgba & 0x0001) ? 0xFF : 0;
        }
    }
}

void Image::loadRGBAFloatData(GLsizei width, GLsizei height,
                              int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const float *source = NULL;
    float *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = reinterpret_cast<const float*>(static_cast<const unsigned char*>(input) + y * inputPitch);
        dest = reinterpret_cast<float*>(static_cast<unsigned char*>(output) + y * outputPitch);
        memcpy(dest, source, width * 16);
    }
}

void Image::loadRGBAHalfFloatData(GLsizei width, GLsizei height,
                                  int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const unsigned char *source = NULL;
    unsigned char *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = static_cast<const unsigned char*>(input) + y * inputPitch;
        dest = static_cast<unsigned char*>(output) + y * outputPitch;
        memcpy(dest, source, width * 8);
    }
}

void Image::loadBGRAData(GLsizei width, GLsizei height,
                         int inputPitch, const void *input, size_t outputPitch, void *output) const
{
    const unsigned char *source = NULL;
    unsigned char *dest = NULL;

    for (int y = 0; y < height; y++)
    {
        source = static_cast<const unsigned char*>(input) + y * inputPitch;
        dest = static_cast<unsigned char*>(output) + y * outputPitch;
        memcpy(dest, source, width*4);
    }
}

void Image::loadCompressedData(GLint xoffset, GLint yoffset, GLsizei width, GLsizei height,
                               const void *input) {
    ASSERT(xoffset % 4 == 0);
    ASSERT(yoffset % 4 == 0);

    RECT lockRect = {
        xoffset, yoffset,
        xoffset + width, yoffset + height
    };

    D3DLOCKED_RECT locked;
    HRESULT result = lock(&locked, &lockRect);
    if (FAILED(result))
    {
        return;
    }

    GLsizei inputSize = ComputeCompressedSize(width, height, mInternalFormat);
    GLsizei inputPitch = ComputeCompressedPitch(width, mInternalFormat);
    int rows = inputSize / inputPitch;
    for (int i = 0; i < rows; ++i)
    {
        memcpy((void*)((BYTE*)locked.pBits + i * locked.Pitch), (void*)((BYTE*)input + i * inputPitch), inputPitch);
    }

    unlock();
}

// This implements glCopyTex[Sub]Image2D for non-renderable internal texture formats and incomplete textures
void Image::copy(GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height, IDirect3DSurface9 *renderTarget)
{
    IDirect3DDevice9 *device = getDevice();
    IDirect3DSurface9 *renderTargetData = NULL;
    D3DSURFACE_DESC description;
    renderTarget->GetDesc(&description);
    
    HRESULT result = device->CreateOffscreenPlainSurface(description.Width, description.Height, description.Format, D3DPOOL_SYSTEMMEM, &renderTargetData, NULL);

    if (FAILED(result))
    {
        ERR("Could not create matching destination surface.");
        return error(GL_OUT_OF_MEMORY);
    }

    result = device->GetRenderTargetData(renderTarget, renderTargetData);

    if (FAILED(result))
    {
        ERR("GetRenderTargetData unexpectedly failed.");
        renderTargetData->Release();
        return error(GL_OUT_OF_MEMORY);
    }

    RECT sourceRect = {x, y, x + width, y + height};
    RECT destRect = {xoffset, yoffset, xoffset + width, yoffset + height};

    D3DLOCKED_RECT sourceLock = {0};
    result = renderTargetData->LockRect(&sourceLock, &sourceRect, 0);

    if (FAILED(result))
    {
        ERR("Failed to lock the source surface (rectangle might be invalid).");
        renderTargetData->Release();
        return error(GL_OUT_OF_MEMORY);
    }

    D3DLOCKED_RECT destLock = {0};
    result = lock(&destLock, &destRect);
    
    if (FAILED(result))
    {
        ERR("Failed to lock the destination surface (rectangle might be invalid).");
        renderTargetData->UnlockRect();
        renderTargetData->Release();
        return error(GL_OUT_OF_MEMORY);
    }

    if (destLock.pBits && sourceLock.pBits)
    {
        unsigned char *source = (unsigned char*)sourceLock.pBits;
        unsigned char *dest = (unsigned char*)destLock.pBits;

        switch (description.Format)
        {
          case D3DFMT_X8R8G8B8:
          case D3DFMT_A8R8G8B8:
            switch(getD3DFormat())
            {
              case D3DFMT_X8R8G8B8:
              case D3DFMT_A8R8G8B8:
                for(int y = 0; y < height; y++)
                {
                    memcpy(dest, source, 4 * width);

                    source += sourceLock.Pitch;
                    dest += destLock.Pitch;
                }
                break;
              case D3DFMT_L8:
                for(int y = 0; y < height; y++)
                {
                    for(int x = 0; x < width; x++)
                    {
                        dest[x] = source[x * 4 + 2];
                    }

                    source += sourceLock.Pitch;
                    dest += destLock.Pitch;
                }
                break;
              case D3DFMT_A8L8:
                for(int y = 0; y < height; y++)
                {
                    for(int x = 0; x < width; x++)
                    {
                        dest[x * 2 + 0] = source[x * 4 + 2];
                        dest[x * 2 + 1] = source[x * 4 + 3];
                    }

                    source += sourceLock.Pitch;
                    dest += destLock.Pitch;
                }
                break;
              default:
                UNREACHABLE();
            }
            break;
          case D3DFMT_R5G6B5:
            switch(getD3DFormat())
            {
              case D3DFMT_X8R8G8B8:
                for(int y = 0; y < height; y++)
                {
                    for(int x = 0; x < width; x++)
                    {
                        unsigned short rgb = ((unsigned short*)source)[x];
                        unsigned char red = (rgb & 0xF800) >> 8;
                        unsigned char green = (rgb & 0x07E0) >> 3;
                        unsigned char blue = (rgb & 0x001F) << 3;
                        dest[x + 0] = blue | (blue >> 5);
                        dest[x + 1] = green | (green >> 6);
                        dest[x + 2] = red | (red >> 5);
                        dest[x + 3] = 0xFF;
                    }

                    source += sourceLock.Pitch;
                    dest += destLock.Pitch;
                }
                break;
              case D3DFMT_L8:
                for(int y = 0; y < height; y++)
                {
                    for(int x = 0; x < width; x++)
                    {
                        unsigned char red = source[x * 2 + 1] & 0xF8;
                        dest[x] = red | (red >> 5);
                    }

                    source += sourceLock.Pitch;
                    dest += destLock.Pitch;
                }
                break;
              default:
                UNREACHABLE();
            }
            break;
          case D3DFMT_A1R5G5B5:
            switch(getD3DFormat())
            {
              case D3DFMT_X8R8G8B8:
                for(int y = 0; y < height; y++)
                {
                    for(int x = 0; x < width; x++)
                    {
                        unsigned short argb = ((unsigned short*)source)[x];
                        unsigned char red = (argb & 0x7C00) >> 7;
                        unsigned char green = (argb & 0x03E0) >> 2;
                        unsigned char blue = (argb & 0x001F) << 3;
                        dest[x + 0] = blue | (blue >> 5);
                        dest[x + 1] = green | (green >> 5);
                        dest[x + 2] = red | (red >> 5);
                        dest[x + 3] = 0xFF;
                    }

                    source += sourceLock.Pitch;
                    dest += destLock.Pitch;
                }
                break;
              case D3DFMT_A8R8G8B8:
                for(int y = 0; y < height; y++)
                {
                    for(int x = 0; x < width; x++)
                    {
                        unsigned short argb = ((unsigned short*)source)[x];
                        unsigned char red = (argb & 0x7C00) >> 7;
                        unsigned char green = (argb & 0x03E0) >> 2;
                        unsigned char blue = (argb & 0x001F) << 3;
                        unsigned char alpha = (signed short)argb >> 15;
                        dest[x + 0] = blue | (blue >> 5);
                        dest[x + 1] = green | (green >> 5);
                        dest[x + 2] = red | (red >> 5);
                        dest[x + 3] = alpha;
                    }

                    source += sourceLock.Pitch;
                    dest += destLock.Pitch;
                }
                break;
              case D3DFMT_L8:
                for(int y = 0; y < height; y++)
                {
                    for(int x = 0; x < width; x++)
                    {
                        unsigned char red = source[x * 2 + 1] & 0x7C;
                        dest[x] = (red << 1) | (red >> 4);
                    }

                    source += sourceLock.Pitch;
                    dest += destLock.Pitch;
                }
                break;
              case D3DFMT_A8L8:
                for(int y = 0; y < height; y++)
                {
                    for(int x = 0; x < width; x++)
                    {
                        unsigned char red = source[x * 2 + 1] & 0x7C;
                        dest[x * 2 + 0] = (red << 1) | (red >> 4);
                        dest[x * 2 + 1] = (signed char)source[x * 2 + 1] >> 7;
                    }

                    source += sourceLock.Pitch;
                    dest += destLock.Pitch;
                }
                break;
              default:
                UNREACHABLE();
            }
            break;
          default:
            UNREACHABLE();
        }
    }

    unlock();
    renderTargetData->UnlockRect();

    renderTargetData->Release();

    mDirty = true;
}

namespace
{
struct L8
{
    unsigned char L;

    static void average(L8 *dst, const L8 *src1, const L8 *src2)
    {
        dst->L = ((src1->L ^ src2->L) >> 1) + (src1->L & src2->L);
    }
};

struct A8L8
{
    unsigned char L;
    unsigned char A;

    static void average(A8L8 *dst, const A8L8 *src1, const A8L8 *src2)
    {
        *(unsigned short*)dst = (((*(unsigned short*)src1 ^ *(unsigned short*)src2) & 0xFEFE) >> 1) + (*(unsigned short*)src1 & *(unsigned short*)src2);
    }
};

struct A8R8G8B8
{
    unsigned char B;
    unsigned char G;
    unsigned char R;
    unsigned char A;

    static void average(A8R8G8B8 *dst, const A8R8G8B8 *src1, const A8R8G8B8 *src2)
    {
        *(unsigned int*)dst = (((*(unsigned int*)src1 ^ *(unsigned int*)src2) & 0xFEFEFEFE) >> 1) + (*(unsigned int*)src1 & *(unsigned int*)src2);
    }
};

struct A16B16G16R16F
{
    unsigned short R;
    unsigned short G;
    unsigned short B;
    unsigned short A;

    static void average(A16B16G16R16F *dst, const A16B16G16R16F *src1, const A16B16G16R16F *src2)
    {
        dst->R = float32ToFloat16((float16ToFloat32(src1->R) + float16ToFloat32(src2->R)) * 0.5f);
        dst->G = float32ToFloat16((float16ToFloat32(src1->G) + float16ToFloat32(src2->G)) * 0.5f);
        dst->B = float32ToFloat16((float16ToFloat32(src1->B) + float16ToFloat32(src2->B)) * 0.5f);
        dst->A = float32ToFloat16((float16ToFloat32(src1->A) + float16ToFloat32(src2->A)) * 0.5f);
    }
};

struct A32B32G32R32F
{
    float R;
    float G;
    float B;
    float A;

    static void average(A32B32G32R32F *dst, const A32B32G32R32F *src1, const A32B32G32R32F *src2)
    {
        dst->R = (src1->R + src2->R) * 0.5f;
        dst->G = (src1->G + src2->G) * 0.5f;
        dst->B = (src1->B + src2->B) * 0.5f;
        dst->A = (src1->A + src2->A) * 0.5f;
    }
};

template <typename T>
void GenerateMip(unsigned int sourceWidth, unsigned int sourceHeight,
                 const unsigned char *sourceData, int sourcePitch,
                 unsigned char *destData, int destPitch)
{
    unsigned int mipWidth = std::max(1U, sourceWidth >> 1);
    unsigned int mipHeight = std::max(1U, sourceHeight >> 1);

    if (sourceHeight == 1)
    {
        ASSERT(sourceWidth != 1);

        const T *src = (const T*)sourceData;
        T *dst = (T*)destData;

        for (unsigned int x = 0; x < mipWidth; x++)
        {
            T::average(&dst[x], &src[x * 2], &src[x * 2 + 1]);
        }
    }
    else if (sourceWidth == 1)
    {
        ASSERT(sourceHeight != 1);

        for (unsigned int y = 0; y < mipHeight; y++)
        {
            const T *src0 = (const T*)(sourceData + y * 2 * sourcePitch);
            const T *src1 = (const T*)(sourceData + y * 2 * sourcePitch + sourcePitch);
            T *dst = (T*)(destData + y * destPitch);

            T::average(dst, src0, src1);
        }
    }
    else
    {
        for (unsigned int y = 0; y < mipHeight; y++)
        {
            const T *src0 = (const T*)(sourceData + y * 2 * sourcePitch);
            const T *src1 = (const T*)(sourceData + y * 2 * sourcePitch + sourcePitch);
            T *dst = (T*)(destData + y * destPitch);

            for (unsigned int x = 0; x < mipWidth; x++)
            {
                T tmp0;
                T tmp1;

                T::average(&tmp0, &src0[x * 2], &src0[x * 2 + 1]);
                T::average(&tmp1, &src1[x * 2], &src1[x * 2 + 1]);
                T::average(&dst[x], &tmp0, &tmp1);
            }
        }
    }
}

void GenerateMip(IDirect3DSurface9 *destSurface, IDirect3DSurface9 *sourceSurface)
{
    D3DSURFACE_DESC destDesc;
    HRESULT result = destSurface->GetDesc(&destDesc);
    ASSERT(SUCCEEDED(result));

    D3DSURFACE_DESC sourceDesc;
    result = sourceSurface->GetDesc(&sourceDesc);
    ASSERT(SUCCEEDED(result));

    ASSERT(sourceDesc.Format == destDesc.Format);
    ASSERT(sourceDesc.Width == 1 || sourceDesc.Width / 2 == destDesc.Width);
    ASSERT(sourceDesc.Height == 1 || sourceDesc.Height / 2 == destDesc.Height);

    D3DLOCKED_RECT sourceLocked = {0};
    result = sourceSurface->LockRect(&sourceLocked, NULL, D3DLOCK_READONLY);
    ASSERT(SUCCEEDED(result));

    D3DLOCKED_RECT destLocked = {0};
    result = destSurface->LockRect(&destLocked, NULL, 0);
    ASSERT(SUCCEEDED(result));

    const unsigned char *sourceData = reinterpret_cast<const unsigned char*>(sourceLocked.pBits);
    unsigned char *destData = reinterpret_cast<unsigned char*>(destLocked.pBits);

    if (sourceData && destData)
    {
        switch (sourceDesc.Format)
        {
          case D3DFMT_L8:
            GenerateMip<L8>(sourceDesc.Width, sourceDesc.Height, sourceData, sourceLocked.Pitch, destData, destLocked.Pitch);
            break;
          case D3DFMT_A8L8:
            GenerateMip<A8L8>(sourceDesc.Width, sourceDesc.Height, sourceData, sourceLocked.Pitch, destData, destLocked.Pitch);
            break;
          case D3DFMT_A8R8G8B8:
          case D3DFMT_X8R8G8B8:
            GenerateMip<A8R8G8B8>(sourceDesc.Width, sourceDesc.Height, sourceData, sourceLocked.Pitch, destData, destLocked.Pitch);
            break;
          case D3DFMT_A16B16G16R16F:
            GenerateMip<A16B16G16R16F>(sourceDesc.Width, sourceDesc.Height, sourceData, sourceLocked.Pitch, destData, destLocked.Pitch);
            break;
          case D3DFMT_A32B32G32R32F:
            GenerateMip<A32B32G32R32F>(sourceDesc.Width, sourceDesc.Height, sourceData, sourceLocked.Pitch, destData, destLocked.Pitch);
            break;
          default:
            UNREACHABLE();
            break;
        }

        destSurface->UnlockRect();
        sourceSurface->UnlockRect();
    }
}
}

TextureStorage::TextureStorage(DWORD usage)
    : mLodOffset(0),
      mD3DUsage(usage),
      mD3DPool(getDisplay()->getTexturePool(usage)),
      mTextureSerial(issueTextureSerial())
{
}

TextureStorage::~TextureStorage()
{
}

bool TextureStorage::isRenderTarget() const
{
    return (mD3DUsage & (D3DUSAGE_RENDERTARGET | D3DUSAGE_DEPTHSTENCIL)) != 0;
}

bool TextureStorage::isManaged() const
{
    return (mD3DPool == D3DPOOL_MANAGED);
}

D3DPOOL TextureStorage::getPool() const
{
    return mD3DPool;
}

DWORD TextureStorage::getUsage() const
{
    return mD3DUsage;
}

unsigned int TextureStorage::getTextureSerial() const
{
    return mTextureSerial;
}

unsigned int TextureStorage::issueTextureSerial()
{
    return mCurrentTextureSerial++;
}

int TextureStorage::getLodOffset() const
{
    return mLodOffset;
}

Texture::Texture(GLuint id) : RefCountObject(id)
{
    mMinFilter = GL_NEAREST_MIPMAP_LINEAR;
    mMagFilter = GL_LINEAR;
    mWrapS = GL_REPEAT;
    mWrapT = GL_REPEAT;
    mDirtyParameters = true;
    mUsage = GL_NONE;
    mMaxAnisotropy = 1.0f;
    
    mDirtyImages = true;

    mImmutable = false;
}

Texture::~Texture()
{
}

// Returns true on successful filter state update (valid enum parameter)
bool Texture::setMinFilter(GLenum filter)
{
    switch (filter)
    {
      case GL_NEAREST:
      case GL_LINEAR:
      case GL_NEAREST_MIPMAP_NEAREST:
      case GL_LINEAR_MIPMAP_NEAREST:
      case GL_NEAREST_MIPMAP_LINEAR:
      case GL_LINEAR_MIPMAP_LINEAR:
        {
            if (mMinFilter != filter)
            {
                mMinFilter = filter;
                mDirtyParameters = true;
            }
            return true;
        }
      default:
        return false;
    }
}

// Returns true on successful filter state update (valid enum parameter)
bool Texture::setMagFilter(GLenum filter)
{
    switch (filter)
    {
      case GL_NEAREST:
      case GL_LINEAR:
        {
            if (mMagFilter != filter)
            {
                mMagFilter = filter;
                mDirtyParameters = true;
            }
            return true;
        }
      default:
        return false;
    }
}

// Returns true on successful wrap state update (valid enum parameter)
bool Texture::setWrapS(GLenum wrap)
{
    switch (wrap)
    {
      case GL_REPEAT:
      case GL_CLAMP_TO_EDGE:
      case GL_MIRRORED_REPEAT:
        {
            if (mWrapS != wrap)
            {
                mWrapS = wrap;
                mDirtyParameters = true;
            }
            return true;
        }
      default:
        return false;
    }
}

// Returns true on successful wrap state update (valid enum parameter)
bool Texture::setWrapT(GLenum wrap)
{
    switch (wrap)
    {
      case GL_REPEAT:
      case GL_CLAMP_TO_EDGE:
      case GL_MIRRORED_REPEAT:
        {
            if (mWrapT != wrap)
            {
                mWrapT = wrap;
                mDirtyParameters = true;
            }
            return true;
        }
      default:
        return false;
    }
}

// Returns true on successful max anisotropy update (valid anisotropy value)
bool Texture::setMaxAnisotropy(float textureMaxAnisotropy, float contextMaxAnisotropy)
{
    textureMaxAnisotropy = std::min(textureMaxAnisotropy, contextMaxAnisotropy);
    if (textureMaxAnisotropy < 1.0f)
    {
        return false;
    }
    if (mMaxAnisotropy != textureMaxAnisotropy)
    {
        mMaxAnisotropy = textureMaxAnisotropy;
        mDirtyParameters = true;
    }
    return true;
}

// Returns true on successful usage state update (valid enum parameter)
bool Texture::setUsage(GLenum usage)
{
    switch (usage)
    {
      case GL_NONE:
      case GL_FRAMEBUFFER_ATTACHMENT_ANGLE:
        mUsage = usage;
        return true;
      default:
        return false;
    }
}

GLenum Texture::getMinFilter() const
{
    return mMinFilter;
}

GLenum Texture::getMagFilter() const
{
    return mMagFilter;
}

GLenum Texture::getWrapS() const
{
    return mWrapS;
}

GLenum Texture::getWrapT() const
{
    return mWrapT;
}

float Texture::getMaxAnisotropy() const
{
    return mMaxAnisotropy;
}

GLenum Texture::getUsage() const
{
    return mUsage;
}

bool Texture::isMipmapFiltered() const
{
    switch (mMinFilter)
    {
      case GL_NEAREST:
      case GL_LINEAR:
        return false;
      case GL_NEAREST_MIPMAP_NEAREST:
      case GL_LINEAR_MIPMAP_NEAREST:
      case GL_NEAREST_MIPMAP_LINEAR:
      case GL_LINEAR_MIPMAP_LINEAR:
        return true;
      default: UNREACHABLE();
        return false;
    }
}

void Texture::setImage(GLint unpackAlignment, const void *pixels, Image *image)
{
    if (pixels != NULL)
    {
        image->loadData(0, 0, image->getWidth(), image->getHeight(), unpackAlignment, pixels);
        mDirtyImages = true;
    }
}

void Texture::setCompressedImage(GLsizei imageSize, const void *pixels, Image *image)
{
    if (pixels != NULL)
    {
        image->loadCompressedData(0, 0, image->getWidth(), image->getHeight(), pixels);
        mDirtyImages = true;
    }
}

bool Texture::subImage(GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint unpackAlignment, const void *pixels, Image *image)
{
    if (pixels != NULL)
    {
        image->loadData(xoffset, yoffset, width, height, unpackAlignment, pixels);
        mDirtyImages = true;
    }

    return true;
}

bool Texture::subImageCompressed(GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLsizei imageSize, const void *pixels, Image *image)
{
    if (pixels != NULL)
    {
        image->loadCompressedData(xoffset, yoffset, width, height, pixels);
        mDirtyImages = true;
    }

    return true;
}

IDirect3DBaseTexture9 *Texture::getTexture()
{
    if (!isSamplerComplete())
    {
        return NULL;
    }

    // ensure the underlying texture is created
    if (getStorage(false) == NULL)
    {
        return NULL;
    }

    updateTexture();

    return getBaseTexture();
}

bool Texture::hasDirtyParameters() const
{
    return mDirtyParameters;
}

bool Texture::hasDirtyImages() const
{
    return mDirtyImages;
}

void Texture::resetDirty()
{
    mDirtyParameters = false;
    mDirtyImages = false;
}

unsigned int Texture::getTextureSerial()
{
    TextureStorage *texture = getStorage(false);
    return texture ? texture->getTextureSerial() : 0;
}

unsigned int Texture::getRenderTargetSerial(GLenum target)
{
    TextureStorage *texture = getStorage(true);
    return texture ? texture->getRenderTargetSerial(target) : 0;
}

bool Texture::isImmutable() const
{
    return mImmutable;
}

int Texture::getLodOffset()
{
    TextureStorage *texture = getStorage(false);
    return texture ? texture->getLodOffset() : 0;
}

GLint Texture::creationLevels(GLsizei width, GLsizei height) const
{
    if ((isPow2(width) && isPow2(height)) || getContext()->supportsNonPower2Texture())
    {
        return 0;   // Maximum number of levels
    }
    else
    {
        // OpenGL ES 2.0 without GL_OES_texture_npot does not permit NPOT mipmaps.
        return 1;
    }
}

GLint Texture::creationLevels(GLsizei size) const
{
    return creationLevels(size, size);
}

int Texture::levelCount()
{
    return getBaseTexture() ? getBaseTexture()->GetLevelCount() - getLodOffset() : 0;
}

Blit *Texture::getBlitter()
{
    Context *context = getContext();
    return context->getBlitter();
}

bool Texture::copyToRenderTarget(IDirect3DSurface9 *dest, IDirect3DSurface9 *source, bool fromManaged)
{
    if (source && dest)
    {
        HRESULT result = D3DERR_OUTOFVIDEOMEMORY;

        if (fromManaged)
        {
            D3DSURFACE_DESC desc;
            source->GetDesc(&desc);

            IDirect3DSurface9 *surf = 0;
            result = getDevice()->CreateOffscreenPlainSurface(desc.Width, desc.Height, desc.Format, D3DPOOL_SYSTEMMEM, &surf, NULL);

            if (SUCCEEDED(result))
            {
                CopyLockableSurfaces(surf, source);
                result = getDevice()->UpdateSurface(surf, NULL, dest, NULL);
                surf->Release();
            }
        }
        else
        {
            egl::Display *display = getDisplay();
            IDirect3DDevice9 *device = display->getDevice();

            display->endScene();
            result = device->StretchRect(source, NULL, dest, NULL, D3DTEXF_NONE);
        }

        if (FAILED(result))
        {
            ASSERT(result == D3DERR_OUTOFVIDEOMEMORY || result == E_OUTOFMEMORY);
            return false;
        }
    }

    return true;
}

TextureStorage2D::TextureStorage2D(IDirect3DTexture9 *surfaceTexture) : TextureStorage(D3DUSAGE_RENDERTARGET), mRenderTargetSerial(RenderbufferStorage::issueSerial())
{
    mTexture = surfaceTexture;
}

TextureStorage2D::TextureStorage2D(int levels, D3DFORMAT format, DWORD usage, int width, int height)
    : TextureStorage(usage), mRenderTargetSerial(RenderbufferStorage::issueSerial())
{
    mTexture = NULL;
    // 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)
    {
        IDirect3DDevice9 *device = getDevice();
        MakeValidSize(false, dx::IsCompressedFormat(format), &width, &height, &mLodOffset);
        HRESULT result = device->CreateTexture(width, height, levels ? levels + mLodOffset : 0, getUsage(), format, getPool(), &mTexture, NULL);

        if (FAILED(result))
        {
            ASSERT(result == D3DERR_OUTOFVIDEOMEMORY || result == E_OUTOFMEMORY);
            error(GL_OUT_OF_MEMORY);
        }
    }
}

TextureStorage2D::~TextureStorage2D()
{
    if (mTexture)
    {
        mTexture->Release();
    }
}

// Increments refcount on surface.
// caller must Release() the returned surface
IDirect3DSurface9 *TextureStorage2D::getSurfaceLevel(int level, bool dirty)
{
    IDirect3DSurface9 *surface = NULL;

    if (mTexture)
    {
        HRESULT result = mTexture->GetSurfaceLevel(level + mLodOffset, &surface);
        ASSERT(SUCCEEDED(result));

        // With managed textures the driver needs to be informed of updates to the lower mipmap levels
        if (level != 0 && isManaged() && dirty)
        {
            mTexture->AddDirtyRect(NULL);
        }
    }

    return surface;
}

IDirect3DBaseTexture9 *TextureStorage2D::getBaseTexture() const
{
    return mTexture;
}

unsigned int TextureStorage2D::getRenderTargetSerial(GLenum target) const
{
    return mRenderTargetSerial;
}

Texture2D::Texture2D(GLuint id) : Texture(id)
{
    mTexStorage = NULL;
    mSurface = NULL;
    mColorbufferProxy = NULL;
    mProxyRefs = 0;
}

Texture2D::~Texture2D()
{
    mColorbufferProxy = NULL;

    delete mTexStorage;
    mTexStorage = NULL;
    
    if (mSurface)
    {
        mSurface->setBoundTexture(NULL);
        mSurface = NULL;
    }
}

// We need to maintain a count of references to renderbuffers acting as 
// proxies for this texture, so that we do not attempt to use a pointer 
// to a renderbuffer proxy which has been deleted.
void Texture2D::addProxyRef(const Renderbuffer *proxy)
{
    mProxyRefs++;
}

void Texture2D::releaseProxy(const Renderbuffer *proxy)
{
    if (mProxyRefs > 0)
        mProxyRefs--;

    if (mProxyRefs == 0)
        mColorbufferProxy = NULL;
}

GLenum Texture2D::getTarget() const
{
    return GL_TEXTURE_2D;
}

GLsizei Texture2D::getWidth(GLint level) const
{
    if (level < IMPLEMENTATION_MAX_TEXTURE_LEVELS)
        return mImageArray[level].getWidth();
    else
        return 0;
}

GLsizei Texture2D::getHeight(GLint level) const
{
    if (level < IMPLEMENTATION_MAX_TEXTURE_LEVELS)
        return mImageArray[level].getHeight();
    else
        return 0;
}

GLenum Texture2D::getInternalFormat(GLint level) const
{
    if (level < IMPLEMENTATION_MAX_TEXTURE_LEVELS)
        return mImageArray[level].getInternalFormat();
    else
        return GL_NONE;
}

D3DFORMAT Texture2D::getD3DFormat(GLint level) const
{
    if (level < IMPLEMENTATION_MAX_TEXTURE_LEVELS)
        return mImageArray[level].getD3DFormat();
    else
        return D3DFMT_UNKNOWN;
}

void Texture2D::redefineImage(GLint level, GLint internalformat, GLsizei width, GLsizei height)
{
    releaseTexImage();

    bool redefined = mImageArray[level].redefine(internalformat, width, height, false);

    if (mTexStorage && redefined)
    {
        for (int i = 0; i < IMPLEMENTATION_MAX_TEXTURE_LEVELS; i++)
        {
            mImageArray[i].markDirty();
        }

        delete mTexStorage;
        mTexStorage = NULL;
        mDirtyImages = true;
    }
}

void Texture2D::setImage(GLint level, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint unpackAlignment, const void *pixels)
{
    GLint internalformat = ConvertSizedInternalFormat(format, type);
    redefineImage(level, internalformat, width, height);

    Texture::setImage(unpackAlignment, pixels, &mImageArray[level]);
}

void Texture2D::bindTexImage(egl::Surface *surface)
{
    releaseTexImage();

    GLint internalformat;

    switch(surface->getFormat())
    {
      case D3DFMT_A8R8G8B8:
        internalformat = GL_RGBA8_OES;
        break;
      case D3DFMT_X8R8G8B8:
        internalformat = GL_RGB8_OES;
        break;
      default:
        UNIMPLEMENTED();
        return;
    }

    mImageArray[0].redefine(internalformat, surface->getWidth(), surface->getHeight(), true);

    delete mTexStorage;
    mTexStorage = new TextureStorage2D(surface->getOffscreenTexture());

    mDirtyImages = true;
    mSurface = surface;
    mSurface->setBoundTexture(this);
}

void Texture2D::releaseTexImage()
{
    if (mSurface)
    {
        mSurface->setBoundTexture(NULL);
        mSurface = NULL;

        if (mTexStorage)
        {
            delete mTexStorage;
            mTexStorage = NULL;
        }

        for (int i = 0; i < IMPLEMENTATION_MAX_TEXTURE_LEVELS; i++)
        {
            mImageArray[i].redefine(GL_RGBA8_OES, 0, 0, true);
        }
    }
}

void Texture2D::setCompressedImage(GLint level, GLenum format, GLsizei width, GLsizei height, GLsizei imageSize, const void *pixels)
{
    // compressed formats don't have separate sized internal formats-- we can just use the compressed format directly
    redefineImage(level, format, width, height);

    Texture::setCompressedImage(imageSize, pixels, &mImageArray[level]);
}

void Texture2D::commitRect(GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height)
{
    ASSERT(mImageArray[level].getSurface() != NULL);

    if (level < levelCount())
    {
        IDirect3DSurface9 *destLevel = mTexStorage->getSurfaceLevel(level, true);

        if (destLevel)
        {
            Image *image = &mImageArray[level];
            image->updateSurface(destLevel, xoffset, yoffset, width, height);

            destLevel->Release();
            image->markClean();
        }
    }
}

void Texture2D::subImage(GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint unpackAlignment, const void *pixels)
{
    if (Texture::subImage(xoffset, yoffset, width, height, format, type, unpackAlignment, pixels, &mImageArray[level]))
    {
        commitRect(level, xoffset, yoffset, width, height);
    }
}

void Texture2D::subImageCompressed(GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLsizei imageSize, const void *pixels)
{
    if (Texture::subImageCompressed(xoffset, yoffset, width, height, format, imageSize, pixels, &mImageArray[level]))
    {
        commitRect(level, xoffset, yoffset, width, height);
    }
}

void Texture2D::copyImage(GLint level, GLenum format, GLint x, GLint y, GLsizei width, GLsizei height, Framebuffer *source)
{
    IDirect3DSurface9 *renderTarget = source->getRenderTarget();

    if (!renderTarget)
    {
        ERR("Failed to retrieve the render target.");
        return error(GL_OUT_OF_MEMORY);
    }

    GLint internalformat = ConvertSizedInternalFormat(format, GL_UNSIGNED_BYTE);
    redefineImage(level, internalformat, width, height);
   
    if (!mImageArray[level].isRenderableFormat())
    {
        mImageArray[level].copy(0, 0, x, y, width, height, renderTarget);
        mDirtyImages = true;
    }
    else
    {
        if (!mTexStorage || !mTexStorage->isRenderTarget())
        {
            convertToRenderTarget();
        }
        
        mImageArray[level].markClean();

        if (width != 0 && height != 0 && level < levelCount())
        {
            RECT sourceRect;
            sourceRect.left = x;
            sourceRect.right = x + width;
            sourceRect.top = y;
            sourceRect.bottom = y + height;
            
            IDirect3DSurface9 *dest = mTexStorage->getSurfaceLevel(level, true);

            if (dest)
            {
                getBlitter()->copy(renderTarget, sourceRect, format, 0, 0, dest);
                dest->Release();
            }
        }
    }

    renderTarget->Release();
}

void Texture2D::copySubImage(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height, Framebuffer *source)
{
    if (xoffset + width > mImageArray[level].getWidth() || yoffset + height > mImageArray[level].getHeight())
    {
        return error(GL_INVALID_VALUE);
    }

    IDirect3DSurface9 *renderTarget = source->getRenderTarget();

    if (!renderTarget)
    {
        ERR("Failed to retrieve the render target.");
        return error(GL_OUT_OF_MEMORY);
    }

    if (!mImageArray[level].isRenderableFormat() || (!mTexStorage && !isSamplerComplete()))
    {
        mImageArray[level].copy(xoffset, yoffset, x, y, width, height, renderTarget);
        mDirtyImages = true;
    }
    else
    {
        if (!mTexStorage || !mTexStorage->isRenderTarget())
        {
            convertToRenderTarget();
        }
        
        updateTexture();

        if (level < levelCount())
        {
            RECT sourceRect;
            sourceRect.left = x;
            sourceRect.right = x + width;
            sourceRect.top = y;
            sourceRect.bottom = y + height;

            IDirect3DSurface9 *dest = mTexStorage->getSurfaceLevel(level, true);

            if (dest)
            {
                getBlitter()->copy(renderTarget, sourceRect, 
                                   gl::ExtractFormat(mImageArray[0].getInternalFormat()),
                                   xoffset, yoffset, dest);
                dest->Release();
            }
        }
    }

    renderTarget->Release();
}

void Texture2D::storage(GLsizei levels, GLenum internalformat, GLsizei width, GLsizei height)
{
    D3DFORMAT d3dfmt = ConvertTextureInternalFormat(internalformat);
    DWORD d3dusage = GetTextureUsage(d3dfmt, mUsage, false);

    delete mTexStorage;
    mTexStorage = new TextureStorage2D(levels, d3dfmt, d3dusage, width, height);
    mImmutable = true;

    for (int level = 0; level < levels; level++)
    {
        mImageArray[level].redefine(internalformat, width, height, true);
        width = std::max(1, width >> 1);
        height = std::max(1, height >> 1);
    }

    for (int level = levels; level < IMPLEMENTATION_MAX_TEXTURE_LEVELS; level++)
    {
        mImageArray[level].redefine(GL_NONE, 0, 0, true);
    }

    if (mTexStorage->isManaged())
    {
        int levels = levelCount();

        for (int level = 0; level < levels; level++)
        {
            IDirect3DSurface9 *surface = mTexStorage->getSurfaceLevel(level, false);
            mImageArray[level].setManagedSurface(surface);
        }
    }
}

// Tests for 2D texture sampling completeness. [OpenGL ES 2.0.24] section 3.8.2 page 85.
bool Texture2D::isSamplerComplete() const
{
    GLsizei width = mImageArray[0].getWidth();
    GLsizei height = mImageArray[0].getHeight();

    if (width <= 0 || height <= 0)
    {
        return false;
    }

    bool mipmapping = isMipmapFiltered();

    if ((IsFloat32Format(getInternalFormat(0)) && !getContext()->supportsFloat32LinearFilter()) ||
        (IsFloat16Format(getInternalFormat(0)) && !getContext()->supportsFloat16LinearFilter()))
    {
        if (mMagFilter != GL_NEAREST || (mMinFilter != GL_NEAREST && mMinFilter != GL_NEAREST_MIPMAP_NEAREST))
        {
            return false;
        }
    }

    bool npotSupport = getContext()->supportsNonPower2Texture();

    if (!npotSupport)
    {
        if ((getWrapS() != GL_CLAMP_TO_EDGE && !isPow2(width)) ||
            (getWrapT() != GL_CLAMP_TO_EDGE && !isPow2(height)))
        {
            return false;
        }
    }

    if (mipmapping)
    {
        if (!npotSupport)
        {
            if (!isPow2(width) || !isPow2(height))
            {
                return false;
            }
        }

        if (!isMipmapComplete())
        {
            return false;
        }
    }

    return true;
}

// Tests for 2D texture (mipmap) completeness. [OpenGL ES 2.0.24] section 3.7.10 page 81.
bool Texture2D::isMipmapComplete() const
{
    if (isImmutable())
    {
        return true;
    }

    GLsizei width = mImageArray[0].getWidth();
    GLsizei height = mImageArray[0].getHeight();

    if (width <= 0 || height <= 0)
    {
        return false;
    }

    int q = log2(std::max(width, height));

    for (int level = 1; level <= q; level++)
    {
        if (mImageArray[level].getInternalFormat() != mImageArray[0].getInternalFormat())
        {
            return false;
        }

        if (mImageArray[level].getWidth() != std::max(1, width >> level))
        {
            return false;
        }

        if (mImageArray[level].getHeight() != std::max(1, height >> level))
        {
            return false;
        }
    }

    return true;
}

bool Texture2D::isCompressed(GLint level) const
{
    return IsCompressed(getInternalFormat(level));
}

bool Texture2D::isDepth(GLint level) const
{
    return IsDepthTexture(getInternalFormat(level));
}

IDirect3DBaseTexture9 *Texture2D::getBaseTexture() const
{
    return mTexStorage ? mTexStorage->getBaseTexture() : NULL;
}

// Constructs a Direct3D 9 texture resource from the texture images
void Texture2D::createTexture()
{
    GLsizei width = mImageArray[0].getWidth();
    GLsizei height = mImageArray[0].getHeight();

    if (!(width > 0 && height > 0))
        return; // do not attempt to create d3d textures for nonexistant data

    GLint levels = creationLevels(width, height);
    D3DFORMAT d3dfmt = mImageArray[0].getD3DFormat();
    DWORD d3dusage = GetTextureUsage(d3dfmt, mUsage, false);

    delete mTexStorage;
    mTexStorage = new TextureStorage2D(levels, d3dfmt, d3dusage, width, height);
    
    if (mTexStorage->isManaged())
    {
        int levels = levelCount();

        for (int level = 0; level < levels; level++)
        {
            IDirect3DSurface9 *surface = mTexStorage->getSurfaceLevel(level, false);
            mImageArray[level].setManagedSurface(surface);
        }
    }

    mDirtyImages = true;
}

void Texture2D::updateTexture()
{
    bool mipmapping = (isMipmapFiltered() && isMipmapComplete());

    int levels = (mipmapping ? levelCount() : 1);

    for (int level = 0; level < levels; level++)
    {
        Image *image = &mImageArray[level];

        if (image->isDirty())
        {
            commitRect(level, 0, 0, mImageArray[level].getWidth(), mImageArray[level].getHeight());
        }
    }
}

void Texture2D::convertToRenderTarget()
{
    TextureStorage2D *newTexStorage = NULL;

    if (mImageArray[0].getWidth() != 0 && mImageArray[0].getHeight() != 0)
    {
        GLsizei width = mImageArray[0].getWidth();
        GLsizei height = mImageArray[0].getHeight();
        GLint levels = creationLevels(width, height);
        D3DFORMAT d3dfmt = mImageArray[0].getD3DFormat();
        DWORD d3dusage = GetTextureUsage(d3dfmt, GL_FRAMEBUFFER_ATTACHMENT_ANGLE, true);

        newTexStorage = new TextureStorage2D(levels, d3dfmt, d3dusage, width, height);

        if (mTexStorage != NULL)
        {
            int levels = levelCount();
            for (int i = 0; i < levels; i++)
            {
                IDirect3DSurface9 *source = mTexStorage->getSurfaceLevel(i, false);
                IDirect3DSurface9 *dest = newTexStorage->getSurfaceLevel(i, true);

                if (!copyToRenderTarget(dest, source, mTexStorage->isManaged()))
                {   
                   delete newTexStorage;
                   if (source) source->Release();
                   if (dest) dest->Release();
                   return error(GL_OUT_OF_MEMORY);
                }

                if (source) source->Release();
                if (dest) dest->Release();
            }
        }
    }

    delete mTexStorage;
    mTexStorage = newTexStorage;

    mDirtyImages = true;
}

void Texture2D::generateMipmaps()
{
    if (!getContext()->supportsNonPower2Texture())
    {
        if (!isPow2(mImageArray[0].getWidth()) || !isPow2(mImageArray[0].getHeight()))
        {
            return error(GL_INVALID_OPERATION);
        }
    }

    // Purge array levels 1 through q and reset them to represent the generated mipmap levels.
    unsigned int q = log2(std::max(mImageArray[0].getWidth(), mImageArray[0].getHeight()));
    for (unsigned int i = 1; i <= q; i++)
    {
        redefineImage(i, mImageArray[0].getInternalFormat(), 
                         std::max(mImageArray[0].getWidth() >> i, 1),
                         std::max(mImageArray[0].getHeight() >> i, 1));
    }

    if (mTexStorage && mTexStorage->isRenderTarget())
    {
        for (unsigned int i = 1; i <= q; i++)
        {
            IDirect3DSurface9 *upper = mTexStorage->getSurfaceLevel(i - 1, false);
            IDirect3DSurface9 *lower = mTexStorage->getSurfaceLevel(i, true);

            if (upper != NULL && lower != NULL)
            {
                getBlitter()->boxFilter(upper, lower);
            }

            if (upper != NULL) upper->Release();
            if (lower != NULL) lower->Release();

            mImageArray[i].markClean();
        }
    }
    else
    {
        for (unsigned int i = 1; i <= q; i++)
        {
            if (mImageArray[i].getSurface() == NULL)
            {
                return error(GL_OUT_OF_MEMORY);
            }

            GenerateMip(mImageArray[i].getSurface(), mImageArray[i - 1].getSurface());

            mImageArray[i].markDirty();
        }
    }
}

Renderbuffer *Texture2D::getRenderbuffer(GLenum target)
{
    if (target != GL_TEXTURE_2D)
    {
        return error(GL_INVALID_OPERATION, (Renderbuffer *)NULL);
    }

    if (mColorbufferProxy == NULL)
    {
        mColorbufferProxy = new Renderbuffer(id(), new RenderbufferTexture2D(this, target));
    }

    return mColorbufferProxy;
}

// Increments refcount on surface.
// caller must Release() the returned surface
IDirect3DSurface9 *Texture2D::getRenderTarget(GLenum target)
{
    ASSERT(target == GL_TEXTURE_2D);

    // ensure the underlying texture is created
    if (getStorage(true) == NULL)
    {
        return NULL;
    }

    updateTexture();
    
    // ensure this is NOT a depth texture
    if (isDepth(0))
    {
        return NULL;
    }
    return mTexStorage->getSurfaceLevel(0, false);
}

// Increments refcount on surface.
// caller must Release() the returned surface
IDirect3DSurface9 *Texture2D::getDepthStencil(GLenum target)
{
    ASSERT(target == GL_TEXTURE_2D);

    // ensure the underlying texture is created
    if (getStorage(true) == NULL)
    {
        return NULL;
    }

    updateTexture();

    // ensure this is actually a depth texture
    if (!isDepth(0))
    {
        return NULL;
    }
    return mTexStorage->getSurfaceLevel(0, false);
}

TextureStorage *Texture2D::getStorage(bool renderTarget)
{
    if (!mTexStorage || (renderTarget && !mTexStorage->isRenderTarget()))
    {
        if (renderTarget)
        {
            convertToRenderTarget();
        }
        else
        {
            createTexture();
        }
    }

    return mTexStorage;
}

TextureStorageCubeMap::TextureStorageCubeMap(int levels, D3DFORMAT format, DWORD usage, int size)
    : TextureStorage(usage), mFirstRenderTargetSerial(RenderbufferStorage::issueCubeSerials())
{
    mTexture = NULL;
    // 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)
    {
        IDirect3DDevice9 *device = getDevice();
        int height = size;
        MakeValidSize(false, dx::IsCompressedFormat(format), &size, &height, &mLodOffset);
        HRESULT result = device->CreateCubeTexture(size, levels ? levels + mLodOffset : 0, getUsage(), format, getPool(), &mTexture, NULL);

        if (FAILED(result))
        {
            ASSERT(result == D3DERR_OUTOFVIDEOMEMORY || result == E_OUTOFMEMORY);
            error(GL_OUT_OF_MEMORY);
        }
    }
}

TextureStorageCubeMap::~TextureStorageCubeMap()
{
    if (mTexture)
    {
        mTexture->Release();
    }
}

// Increments refcount on surface.
// caller must Release() the returned surface
IDirect3DSurface9 *TextureStorageCubeMap::getCubeMapSurface(GLenum faceTarget, int level, bool dirty)
{
    IDirect3DSurface9 *surface = NULL;

    if (mTexture)
    {
        D3DCUBEMAP_FACES face = es2dx::ConvertCubeFace(faceTarget);
        HRESULT result = mTexture->GetCubeMapSurface(face, level + mLodOffset, &surface);
        ASSERT(SUCCEEDED(result));

        // With managed textures the driver needs to be informed of updates to the lower mipmap levels
        if (level != 0 && isManaged() && dirty)
        {
            mTexture->AddDirtyRect(face, NULL);
        }
    }

    return surface;
}

IDirect3DBaseTexture9 *TextureStorageCubeMap::getBaseTexture() const
{
    return mTexture;
}

unsigned int TextureStorageCubeMap::getRenderTargetSerial(GLenum target) const
{
    return mFirstRenderTargetSerial + TextureCubeMap::faceIndex(target);
}

TextureCubeMap::TextureCubeMap(GLuint id) : Texture(id)
{
    mTexStorage = NULL;
    for (int i = 0; i < 6; i++)
    {
        mFaceProxies[i] = NULL;
        mFaceProxyRefs[i] = 0;
    }
}

TextureCubeMap::~TextureCubeMap()
{
    for (int i = 0; i < 6; i++)
    {
        mFaceProxies[i] = NULL;
    }

    delete mTexStorage;
    mTexStorage = NULL;
}

// We need to maintain a count of references to renderbuffers acting as 
// proxies for this texture, so that the texture is not deleted while 
// proxy references still exist. If the reference count drops to zero,
// we set our proxy pointer NULL, so that a new attempt at referencing
// will cause recreation.
void TextureCubeMap::addProxyRef(const Renderbuffer *proxy)
{
    for (int i = 0; i < 6; i++)
    {
        if (mFaceProxies[i] == proxy)
            mFaceProxyRefs[i]++;
    }
}

void TextureCubeMap::releaseProxy(const Renderbuffer *proxy)
{
    for (int i = 0; i < 6; i++)
    {
        if (mFaceProxies[i] == proxy)
        {
            if (mFaceProxyRefs[i] > 0)
                mFaceProxyRefs[i]--;

            if (mFaceProxyRefs[i] == 0)
                mFaceProxies[i] = NULL;
        }
    }
}

GLenum TextureCubeMap::getTarget() const
{
    return GL_TEXTURE_CUBE_MAP;
}

GLsizei TextureCubeMap::getWidth(GLenum target, GLint level) const
{
    if (level < IMPLEMENTATION_MAX_TEXTURE_LEVELS)
        return mImageArray[faceIndex(target)][level].getWidth();
    else
        return 0;
}

GLsizei TextureCubeMap::getHeight(GLenum target, GLint level) const
{
    if (level < IMPLEMENTATION_MAX_TEXTURE_LEVELS)
        return mImageArray[faceIndex(target)][level].getHeight();
    else
        return 0;
}

GLenum TextureCubeMap::getInternalFormat(GLenum target, GLint level) const
{
    if (level < IMPLEMENTATION_MAX_TEXTURE_LEVELS)
        return mImageArray[faceIndex(target)][level].getInternalFormat();
    else
        return GL_NONE;
}

D3DFORMAT TextureCubeMap::getD3DFormat(GLenum target, GLint level) const
{
    if (level < IMPLEMENTATION_MAX_TEXTURE_LEVELS)
        return mImageArray[faceIndex(target)][level].getD3DFormat();
    else
        return D3DFMT_UNKNOWN;
}

void TextureCubeMap::setImagePosX(GLint level, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint unpackAlignment, const void *pixels)
{
    setImage(0, level, width, height, format, type, unpackAlignment, pixels);
}

void TextureCubeMap::setImageNegX(GLint level, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint unpackAlignment, const void *pixels)
{
    setImage(1, level, width, height, format, type, unpackAlignment, pixels);
}

void TextureCubeMap::setImagePosY(GLint level, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint unpackAlignment, const void *pixels)
{
    setImage(2, level, width, height, format, type, unpackAlignment, pixels);
}

void TextureCubeMap::setImageNegY(GLint level, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint unpackAlignment, const void *pixels)
{
    setImage(3, level, width, height, format, type, unpackAlignment, pixels);
}

void TextureCubeMap::setImagePosZ(GLint level, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint unpackAlignment, const void *pixels)
{
    setImage(4, level, width, height, format, type, unpackAlignment, pixels);
}

void TextureCubeMap::setImageNegZ(GLint level, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint unpackAlignment, const void *pixels)
{
    setImage(5, level, width, height, format, type, unpackAlignment, pixels);
}

void TextureCubeMap::setCompressedImage(GLenum face, GLint level, GLenum format, GLsizei width, GLsizei height, GLsizei imageSize, const void *pixels)
{
    // compressed formats don't have separate sized internal formats-- we can just use the compressed format directly
    redefineImage(faceIndex(face), level, format, width, height);

    Texture::setCompressedImage(imageSize, pixels, &mImageArray[faceIndex(face)][level]);
}

void TextureCubeMap::commitRect(int face, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height)
{
    ASSERT(mImageArray[face][level].getSurface() != NULL);

    if (level < levelCount())
    {
        IDirect3DSurface9 *destLevel = mTexStorage->getCubeMapSurface(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level, true);
        ASSERT(destLevel != NULL);

        if (destLevel != NULL)
        {
            Image *image = &mImageArray[face][level];
            image->updateSurface(destLevel, xoffset, yoffset, width, height);

            destLevel->Release();
            image->markClean();
        }
    }
}

void TextureCubeMap::subImage(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint unpackAlignment, const void *pixels)
{
    if (Texture::subImage(xoffset, yoffset, width, height, format, type, unpackAlignment, pixels, &mImageArray[faceIndex(target)][level]))
    {
        commitRect(faceIndex(target), level, xoffset, yoffset, width, height);
    }
}

void TextureCubeMap::subImageCompressed(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLsizei imageSize, const void *pixels)
{
    if (Texture::subImageCompressed(xoffset, yoffset, width, height, format, imageSize, pixels, &mImageArray[faceIndex(target)][level]))
    {
        commitRect(faceIndex(target), level, xoffset, yoffset, width, height);
    }
}

// Tests for cube map sampling completeness. [OpenGL ES 2.0.24] section 3.8.2 page 86.
bool TextureCubeMap::isSamplerComplete() const
{
    int size = mImageArray[0][0].getWidth();

    bool mipmapping = isMipmapFiltered();

    if ((gl::ExtractType(getInternalFormat(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0)) == GL_FLOAT && !getContext()->supportsFloat32LinearFilter()) ||
        (gl::ExtractType(getInternalFormat(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0) == GL_HALF_FLOAT_OES) && !getContext()->supportsFloat16LinearFilter()))
    {
        if (mMagFilter != GL_NEAREST || (mMinFilter != GL_NEAREST && mMinFilter != GL_NEAREST_MIPMAP_NEAREST))
        {
            return false;
        }
    }

    if (!isPow2(size) && !getContext()->supportsNonPower2Texture())
    {
        if (getWrapS() != GL_CLAMP_TO_EDGE || getWrapT() != GL_CLAMP_TO_EDGE || mipmapping)
        {
            return false;
        }
    }

    if (!mipmapping)
    {
        if (!isCubeComplete())
        {
            return false;
        }
    }
    else
    {
        if (!isMipmapCubeComplete())   // Also tests for isCubeComplete()
        {
            return false;
        }
    }

    return true;
}

// Tests for cube texture completeness. [OpenGL ES 2.0.24] section 3.7.10 page 81.
bool TextureCubeMap::isCubeComplete() const
{
    if (mImageArray[0][0].getWidth() <= 0 || mImageArray[0][0].getHeight() != mImageArray[0][0].getWidth())
    {
        return false;
    }

    for (unsigned int face = 1; face < 6; face++)
    {
        if (mImageArray[face][0].getWidth() != mImageArray[0][0].getWidth() ||
            mImageArray[face][0].getWidth() != mImageArray[0][0].getHeight() ||
            mImageArray[face][0].getInternalFormat() != mImageArray[0][0].getInternalFormat())
        {
            return false;
        }
    }

    return true;
}

bool TextureCubeMap::isMipmapCubeComplete() const
{
    if (isImmutable())
    {
        return true;
    }

    if (!isCubeComplete())
    {
        return false;
    }

    GLsizei size = mImageArray[0][0].getWidth();

    int q = log2(size);

    for (int face = 0; face < 6; face++)
    {
        for (int level = 1; level <= q; level++)
        {
            if (mImageArray[face][level].getInternalFormat() != mImageArray[0][0].getInternalFormat())
            {
                return false;
            }

            if (mImageArray[face][level].getWidth() != std::max(1, size >> level))
            {
                return false;
            }
        }
    }

    return true;
}

bool TextureCubeMap::isCompressed(GLenum target, GLint level) const
{
    return IsCompressed(getInternalFormat(target, level));
}

IDirect3DBaseTexture9 *TextureCubeMap::getBaseTexture() const
{
    return mTexStorage ? mTexStorage->getBaseTexture() : NULL;
}

// Constructs a Direct3D 9 texture resource from the texture images, or returns an existing one
void TextureCubeMap::createTexture()
{
    GLsizei size = mImageArray[0][0].getWidth();

    if (!(size > 0))
        return; // do not attempt to create d3d textures for nonexistant data

    GLint levels = creationLevels(size);
    D3DFORMAT d3dfmt = mImageArray[0][0].getD3DFormat();
    DWORD d3dusage = GetTextureUsage(d3dfmt, mUsage, false);

    delete mTexStorage;
    mTexStorage = new TextureStorageCubeMap(levels, d3dfmt, d3dusage, size);

    if (mTexStorage->isManaged())
    {
        int levels = levelCount();

        for (int face = 0; face < 6; face++)
        {
            for (int level = 0; level < levels; level++)
            {
                IDirect3DSurface9 *surface = mTexStorage->getCubeMapSurface(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level, false);
                mImageArray[face][level].setManagedSurface(surface);
            }
        }
    }

    mDirtyImages = true;
}

void TextureCubeMap::updateTexture()
{
    bool mipmapping = isMipmapFiltered() && isMipmapCubeComplete();

    for (int face = 0; face < 6; face++)
    {
        int levels = (mipmapping ? levelCount() : 1);

        for (int level = 0; level < levels; level++)
        {
            Image *image = &mImageArray[face][level];

            if (image->isDirty())
            {
                commitRect(face, level, 0, 0, image->getWidth(), image->getHeight());
            }
        }
    }
}

void TextureCubeMap::convertToRenderTarget()
{
    TextureStorageCubeMap *newTexStorage = NULL;

    if (mImageArray[0][0].getWidth() != 0)
    {
        GLsizei size = mImageArray[0][0].getWidth();
        GLint levels = creationLevels(size);
        D3DFORMAT d3dfmt = mImageArray[0][0].getD3DFormat();
        DWORD d3dusage = GetTextureUsage(d3dfmt, GL_FRAMEBUFFER_ATTACHMENT_ANGLE, true);

        newTexStorage = new TextureStorageCubeMap(levels, d3dfmt, d3dusage, size);

        if (mTexStorage != NULL)
        {
            int levels = levelCount();
            for (int f = 0; f < 6; f++)
            {
                for (int i = 0; i < levels; i++)
                {
                    IDirect3DSurface9 *source = mTexStorage->getCubeMapSurface(GL_TEXTURE_CUBE_MAP_POSITIVE_X + f, i, false);
                    IDirect3DSurface9 *dest = newTexStorage->getCubeMapSurface(GL_TEXTURE_CUBE_MAP_POSITIVE_X + f, i, true);

                    if (!copyToRenderTarget(dest, source, mTexStorage->isManaged()))
                    {
                       delete newTexStorage;
                       if (source) source->Release();
                       if (dest) dest->Release();
                       return error(GL_OUT_OF_MEMORY);
                    }

                    if (source) source->Release();
                    if (dest) dest->Release();
                }
            }
        }
    }

    delete mTexStorage;
    mTexStorage = newTexStorage;

    mDirtyImages = true;
}

void TextureCubeMap::setImage(int faceIndex, GLint level, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint unpackAlignment, const void *pixels)
{
    GLint internalformat = ConvertSizedInternalFormat(format, type);
    redefineImage(faceIndex, level, internalformat, width, height);

    Texture::setImage(unpackAlignment, pixels, &mImageArray[faceIndex][level]);
}

unsigned int TextureCubeMap::faceIndex(GLenum face)
{
    META_ASSERT(GL_TEXTURE_CUBE_MAP_NEGATIVE_X - GL_TEXTURE_CUBE_MAP_POSITIVE_X == 1);
    META_ASSERT(GL_TEXTURE_CUBE_MAP_POSITIVE_Y - GL_TEXTURE_CUBE_MAP_POSITIVE_X == 2);
    META_ASSERT(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y - GL_TEXTURE_CUBE_MAP_POSITIVE_X == 3);
    META_ASSERT(GL_TEXTURE_CUBE_MAP_POSITIVE_Z - GL_TEXTURE_CUBE_MAP_POSITIVE_X == 4);
    META_ASSERT(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z - GL_TEXTURE_CUBE_MAP_POSITIVE_X == 5);

    return face - GL_TEXTURE_CUBE_MAP_POSITIVE_X;
}

void TextureCubeMap::redefineImage(int face, GLint level, GLint internalformat, GLsizei width, GLsizei height)
{
    bool redefined = mImageArray[face][level].redefine(internalformat, width, height, false);

    if (mTexStorage && redefined)
    {
        for (int i = 0; i < IMPLEMENTATION_MAX_TEXTURE_LEVELS; i++)
        {
            for (int f = 0; f < 6; f++)
            {
                mImageArray[f][i].markDirty();
            }
        }

        delete mTexStorage;
        mTexStorage = NULL;

        mDirtyImages = true;
    }
}

void TextureCubeMap::copyImage(GLenum target, GLint level, GLenum format, GLint x, GLint y, GLsizei width, GLsizei height, Framebuffer *source)
{
    IDirect3DSurface9 *renderTarget = source->getRenderTarget();

    if (!renderTarget)
    {
        ERR("Failed to retrieve the render target.");
        return error(GL_OUT_OF_MEMORY);
    }

    unsigned int faceindex = faceIndex(target);
    GLint internalformat = gl::ConvertSizedInternalFormat(format, GL_UNSIGNED_BYTE);
    redefineImage(faceindex, level, internalformat, width, height);

    if (!mImageArray[faceindex][level].isRenderableFormat())
    {
        mImageArray[faceindex][level].copy(0, 0, x, y, width, height, renderTarget);
        mDirtyImages = true;
    }
    else
    {
        if (!mTexStorage || !mTexStorage->isRenderTarget())
        {
            convertToRenderTarget();
        }
        
        mImageArray[faceindex][level].markClean();

        ASSERT(width == height);

        if (width > 0 && level < levelCount())
        {
            RECT sourceRect;
            sourceRect.left = x;
            sourceRect.right = x + width;
            sourceRect.top = y;
            sourceRect.bottom = y + height;

            IDirect3DSurface9 *dest = mTexStorage->getCubeMapSurface(target, level, true);

            if (dest)
            {
                getBlitter()->copy(renderTarget, sourceRect, format, 0, 0, dest);
                dest->Release();
            }
        }
    }

    renderTarget->Release();
}

void TextureCubeMap::copySubImage(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height, Framebuffer *source)
{
    GLsizei size = mImageArray[faceIndex(target)][level].getWidth();

    if (xoffset + width > size || yoffset + height > size)
    {
        return error(GL_INVALID_VALUE);
    }

    IDirect3DSurface9 *renderTarget = source->getRenderTarget();

    if (!renderTarget)
    {
        ERR("Failed to retrieve the render target.");
        return error(GL_OUT_OF_MEMORY);
    }

    unsigned int faceindex = faceIndex(target);

    if (!mImageArray[faceindex][level].isRenderableFormat() || (!mTexStorage && !isSamplerComplete()))
    {
        mImageArray[faceindex][level].copy(0, 0, x, y, width, height, renderTarget);
        mDirtyImages = true;
    }
    else
    {
        if (!mTexStorage || !mTexStorage->isRenderTarget())
        {
            convertToRenderTarget();
        }
        
        updateTexture();

        if (level < levelCount())
        {
            RECT sourceRect;
            sourceRect.left = x;
            sourceRect.right = x + width;
            sourceRect.top = y;
            sourceRect.bottom = y + height;

            IDirect3DSurface9 *dest = mTexStorage->getCubeMapSurface(target, level, true);

            if (dest)
            {
                getBlitter()->copy(renderTarget, sourceRect, gl::ExtractFormat(mImageArray[0][0].getInternalFormat()), xoffset, yoffset, dest);
                dest->Release();
            }
        }
    }

    renderTarget->Release();
}

void TextureCubeMap::storage(GLsizei levels, GLenum internalformat, GLsizei size)
{
    D3DFORMAT d3dfmt = ConvertTextureInternalFormat(internalformat);
    DWORD d3dusage = GetTextureUsage(d3dfmt, mUsage, false);

    delete mTexStorage;
    mTexStorage = new TextureStorageCubeMap(levels, d3dfmt, d3dusage, size);
    mImmutable = true;

    for (int level = 0; level < levels; level++)
    {
        for (int face = 0; face < 6; face++)
        {
            mImageArray[face][level].redefine(internalformat, size, size, true);
            size = std::max(1, size >> 1);
        }
    }

    for (int level = levels; level < IMPLEMENTATION_MAX_TEXTURE_LEVELS; level++)
    {
        for (int face = 0; face < 6; face++)
        {
            mImageArray[face][level].redefine(GL_NONE, 0, 0, true);
        }
    }

    if (mTexStorage->isManaged())
    {
        int levels = levelCount();

        for (int face = 0; face < 6; face++)
        {
            for (int level = 0; level < levels; level++)
            {
                IDirect3DSurface9 *surface = mTexStorage->getCubeMapSurface(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level, false);
                mImageArray[face][level].setManagedSurface(surface);
            }
        }
    }
}

void TextureCubeMap::generateMipmaps()
{
    if (!isCubeComplete())
    {
        return error(GL_INVALID_OPERATION);
    }

    if (!getContext()->supportsNonPower2Texture())
    {
        if (!isPow2(mImageArray[0][0].getWidth()))
        {
            return error(GL_INVALID_OPERATION);
        }
    }

    // Purge array levels 1 through q and reset them to represent the generated mipmap levels.
    unsigned int q = log2(mImageArray[0][0].getWidth());
    for (unsigned int f = 0; f < 6; f++)
    {
        for (unsigned int i = 1; i <= q; i++)
        {
            redefineImage(f, i, mImageArray[f][0].getInternalFormat(),
                                std::max(mImageArray[f][0].getWidth() >> i, 1),
                                std::max(mImageArray[f][0].getWidth() >> i, 1));
        }
    }

    if (mTexStorage && mTexStorage->isRenderTarget())
    {
        for (unsigned int f = 0; f < 6; f++)
        {
            for (unsigned int i = 1; i <= q; i++)
            {
                IDirect3DSurface9 *upper = mTexStorage->getCubeMapSurface(GL_TEXTURE_CUBE_MAP_POSITIVE_X + f, i - 1, false);
                IDirect3DSurface9 *lower = mTexStorage->getCubeMapSurface(GL_TEXTURE_CUBE_MAP_POSITIVE_X + f, i, true);

                if (upper != NULL && lower != NULL)
                {
                    getBlitter()->boxFilter(upper, lower);
                }

                if (upper != NULL) upper->Release();
                if (lower != NULL) lower->Release();

                mImageArray[f][i].markClean();
            }
        }
    }
    else
    {
        for (unsigned int f = 0; f < 6; f++)
        {
            for (unsigned int i = 1; i <= q; i++)
            {
                if (mImageArray[f][i].getSurface() == NULL)
                {
                    return error(GL_OUT_OF_MEMORY);
                }

                GenerateMip(mImageArray[f][i].getSurface(), mImageArray[f][i - 1].getSurface());

                mImageArray[f][i].markDirty();
            }
        }
    }
}

Renderbuffer *TextureCubeMap::getRenderbuffer(GLenum target)
{
    if (!IsCubemapTextureTarget(target))
    {
        return error(GL_INVALID_OPERATION, (Renderbuffer *)NULL);
    }

    unsigned int face = faceIndex(target);

    if (mFaceProxies[face] == NULL)
    {
        mFaceProxies[face] = new Renderbuffer(id(), new RenderbufferTextureCubeMap(this, target));
    }

    return mFaceProxies[face];
}

// Increments refcount on surface.
// caller must Release() the returned surface
IDirect3DSurface9 *TextureCubeMap::getRenderTarget(GLenum target)
{
    ASSERT(IsCubemapTextureTarget(target));

    // ensure the underlying texture is created
    if (getStorage(true) == NULL)
    {
        return NULL;
    }

    updateTexture();
    
    return mTexStorage->getCubeMapSurface(target, 0, false);
}

TextureStorage *TextureCubeMap::getStorage(bool renderTarget)
{
    if (!mTexStorage || (renderTarget && !mTexStorage->isRenderTarget()))
    {
        if (renderTarget)
        {
            convertToRenderTarget();
        }
        else
        {
            createTexture();
        }
    }

    return mTexStorage;
}

}
