//
// 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.
//

// Image.cpp: Implements the rx::Image class, which acts as the interface to
// the actual underlying surfaces of a Texture.

#include "libGLESv2/renderer/Image.h"

#include "libEGL/Display.h"

#include "libGLESv2/main.h"
#include "libGLESv2/mathutil.h"
#include "libGLESv2/utilities.h"
#include "libGLESv2/Texture.h"
#include "libGLESv2/Framebuffer.h"
#include "libGLESv2/renderer/RenderTarget9.h"

#include "libGLESv2/renderer/renderer9_utils.h"

namespace rx
{

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 = gl::float32ToFloat16((gl::float16ToFloat32(src1->R) + gl::float16ToFloat32(src2->R)) * 0.5f);
        dst->G = gl::float32ToFloat16((gl::float16ToFloat32(src1->G) + gl::float16ToFloat32(src2->G)) * 0.5f);
        dst->B = gl::float32ToFloat16((gl::float16ToFloat32(src1->B) + gl::float16ToFloat32(src2->B)) * 0.5f);
        dst->A = gl::float32ToFloat16((gl::float16ToFloat32(src1->A) + gl::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();
    }
}
}

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

    mSurface = NULL;

    mDirty = false;

    mRenderer = NULL;

    mD3DPool = D3DPOOL_SYSTEMMEM;
    mD3DFormat = D3DFMT_UNKNOWN;
    mActualFormat = GL_NONE;
}

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

void Image::GenerateMipmap(Image *dest, Image *source)
{
    IDirect3DSurface9 *sourceSurface = source->getSurface();
    if (sourceSurface == NULL)
        return error(GL_OUT_OF_MEMORY);

    IDirect3DSurface9 *destSurface = dest->getSurface();
    GenerateMip(destSurface, sourceSurface);

    source->markDirty();
}

void Image::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();
}

bool Image::redefine(rx::Renderer9 *renderer, 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 = renderer->ConvertTextureInternalFormat(internalformat);
        mActualFormat = d3d9_gl::GetEquivalentFormat(mD3DFormat);

        ASSERT(dynamic_cast<rx::Renderer9*>(renderer) != NULL); // D3D9_REPLACE
        mRenderer = static_cast<rx::Renderer9*>(renderer); // D3D9_REPLACE

        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;
        gl::MakeValidSize(true, gl::IsCompressed(mInternalFormat), &requestWidth, &requestHeight, &levelToFetch);

        IDirect3DDevice9 *device = mRenderer->getDevice(); // D3D9_REPLACE

        HRESULT result = device->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 TextureStorage::IsTextureFormatRenderable(getD3DFormat());
}

GLenum Image::getActualFormat() const
{
    return mActualFormat;
}

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(TextureStorage2D *storage, int level)
{
    setManagedSurface(storage->getSurfaceLevel(level, false));
}

void Image::setManagedSurface(TextureStorageCubeMap *storage, int face, int level)
{
    setManagedSurface(storage->getCubeMapSurface(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level, false));
}

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;
    }
}

bool Image::updateSurface(TextureStorage2D *storage, int level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height)
{
    return updateSurface(storage->getSurfaceLevel(level, true), xoffset, yoffset, width, height);
}

bool Image::updateSurface(TextureStorageCubeMap *storage, int face, int level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height)
{
    return updateSurface(storage->getCubeMapSurface(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level, true), xoffset, yoffset, width, height);
}

bool Image::updateSurface(IDirect3DSurface9 *destSurface, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height)
{
    if (!destSurface)
        return false;

    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};

        IDirect3DDevice9 *device = mRenderer->getDevice(); // D3D9_REPLACE

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

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

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

    destSurface->Release();
    return true;
}

// 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 = gl::ComputePitch(width, mInternalFormat, unpackAlignment);

    switch (mInternalFormat)
    {
      case GL_ALPHA8_EXT:
        if (gl::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 (gl::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 = gl::ComputeCompressedSize(width, height, mInternalFormat);
    GLsizei inputPitch = gl::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, gl::Framebuffer *source)
{
    RenderTarget9 *renderTarget = NULL;
    IDirect3DSurface9 *surface = NULL;
    gl::Renderbuffer *colorbuffer = source->getColorbuffer();

    if (colorbuffer)
    {
        renderTarget = RenderTarget9::makeRenderTarget9(colorbuffer->getRenderTarget());
    }
    
    if (renderTarget)
    {
        surface = renderTarget->getSurface();
    }

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

    IDirect3DDevice9 *device = mRenderer->getDevice(); // D3D9_REPLACE

    IDirect3DSurface9 *renderTargetData = NULL;
    D3DSURFACE_DESC description;
    surface->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.");
        surface->Release();
        return error(GL_OUT_OF_MEMORY);
    }

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

    if (FAILED(result))
    {
        ERR("GetRenderTargetData unexpectedly failed.");
        renderTargetData->Release();
        surface->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();
        surface->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();
        surface->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();
    surface->Release();

    mDirty = true;
}

}