path: root/src/3rdparty/angle/src/libGLESv2/renderer/d3d9/Image9.cpp

#include "precompiled.h"
//
// 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.
//

// Image9.cpp: Implements the rx::Image9 class, which acts as the interface to
// the actual underlying surfaces of a Texture.

#include "libGLESv2/renderer/d3d9/Image9.h"

#include "libGLESv2/main.h"
#include "libGLESv2/Framebuffer.h"
#include "libGLESv2/Renderbuffer.h"
#include "libGLESv2/renderer/d3d9/Renderer9.h"
#include "libGLESv2/renderer/d3d9/RenderTarget9.h"
#include "libGLESv2/renderer/d3d9/TextureStorage9.h"

#include "libGLESv2/renderer/d3d9/renderer9_utils.h"
#include "libGLESv2/renderer/generatemip.h"

namespace rx
{

Image9::Image9()
{
    mSurface = NULL;
    mRenderer = NULL;

    mD3DPool = D3DPOOL_SYSTEMMEM;
    mD3DFormat = D3DFMT_UNKNOWN;
}

Image9::~Image9()
{
    if (mSurface)
    {
        mSurface->Release();
    }
}

void Image9::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();
    }
}

Image9 *Image9::makeImage9(Image *img)
{
    ASSERT(HAS_DYNAMIC_TYPE(rx::Image9*, img));
    return static_cast<rx::Image9*>(img);
}

void Image9::generateMipmap(Image9 *dest, Image9 *source)
{
    IDirect3DSurface9 *sourceSurface = source->getSurface();
    if (sourceSurface == NULL)
        return gl::error(GL_OUT_OF_MEMORY);

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

    dest->markDirty();
}

void Image9::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 = d3d9::IsCompressedFormat(desc.Format) ? desc.Height / 4 : desc.Height;
        int bytes = d3d9::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 Image9::redefine(rx::Renderer *renderer, GLint internalformat, GLsizei width, GLsizei height, bool forceRelease)
{
    if (mWidth != width ||
        mHeight != height ||
        mInternalFormat != internalformat ||
        forceRelease)
    {
        mRenderer = Renderer9::makeRenderer9(renderer);

        mWidth = width;
        mHeight = height;
        mInternalFormat = internalformat;
        // compute the d3d format that will be used
        mD3DFormat = mRenderer->ConvertTextureInternalFormat(internalformat);
        mActualFormat = d3d9_gl::GetEquivalentFormat(mD3DFormat);

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

        return true;
    }

    return false;
}

void Image9::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();

        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 gl::error(GL_OUT_OF_MEMORY);
        }

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

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

HRESULT Image9::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 Image9::unlock()
{
    if (mSurface)
    {
        HRESULT result = mSurface->UnlockRect();
        ASSERT(SUCCEEDED(result));
    }
}

bool Image9::isRenderableFormat() const
{    
    return TextureStorage9::IsTextureFormatRenderable(getD3DFormat());
}

D3DFORMAT Image9::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 *Image9::getSurface()
{
    createSurface();

    return mSurface;
}

void Image9::setManagedSurface(TextureStorageInterface2D *storage, int level)
{
    TextureStorage9_2D *storage9 = TextureStorage9_2D::makeTextureStorage9_2D(storage->getStorageInstance());
    setManagedSurface(storage9->getSurfaceLevel(level, false));
}

void Image9::setManagedSurface(TextureStorageInterfaceCube *storage, int face, int level)
{
    TextureStorage9_Cube *storage9 = TextureStorage9_Cube::makeTextureStorage9_Cube(storage->getStorageInstance());
    setManagedSurface(storage9->getCubeMapSurface(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level, false));
}

void Image9::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 Image9::updateSurface(TextureStorageInterface2D *storage, int level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height)
{
    ASSERT(getSurface() != NULL);
    TextureStorage9_2D *storage9 = TextureStorage9_2D::makeTextureStorage9_2D(storage->getStorageInstance());
    return updateSurface(storage9->getSurfaceLevel(level, true), xoffset, yoffset, width, height);
}

bool Image9::updateSurface(TextureStorageInterfaceCube *storage, int face, int level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height)
{
    ASSERT(getSurface() != NULL);
    TextureStorage9_Cube *storage9 = TextureStorage9_Cube::makeTextureStorage9_Cube(storage->getStorageInstance());
    return updateSurface(storage9->getCubeMapSurface(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level, true), xoffset, yoffset, width, height);
}

bool Image9::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();

        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 Image9::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 defined(__SSE2__)
        if (gl::supportsSSE2())
        {
            loadAlphaDataToBGRASSE2(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        }
        else
#endif
        {
            loadAlphaDataToBGRA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        }
        break;
      case GL_LUMINANCE8_EXT:
        loadLuminanceDataToNativeOrBGRA(width, height, inputPitch, input, locked.Pitch, locked.pBits, getD3DFormat() == D3DFMT_L8);
        break;
      case GL_ALPHA32F_EXT:
        loadAlphaFloatDataToRGBA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_LUMINANCE32F_EXT:
        loadLuminanceFloatDataToRGBA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_ALPHA16F_EXT:
        loadAlphaHalfFloatDataToRGBA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_LUMINANCE16F_EXT:
        loadLuminanceHalfFloatDataToRGBA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_LUMINANCE8_ALPHA8_EXT:
        loadLuminanceAlphaDataToNativeOrBGRA(width, height, inputPitch, input, locked.Pitch, locked.pBits, getD3DFormat() == D3DFMT_A8L8);
        break;
      case GL_LUMINANCE_ALPHA32F_EXT:
        loadLuminanceAlphaFloatDataToRGBA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_LUMINANCE_ALPHA16F_EXT:
        loadLuminanceAlphaHalfFloatDataToRGBA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGB8_OES:
        loadRGBUByteDataToBGRX(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGB565:
        loadRGB565DataToBGRA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGBA8_OES:
#if defined(__SSE2__)
        if (gl::supportsSSE2())
        {
            loadRGBAUByteDataToBGRASSE2(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        }
        else
#endif
        {
            loadRGBAUByteDataToBGRA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        }
        break;
      case GL_RGBA4:
        loadRGBA4444DataToBGRA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGB5_A1:
        loadRGBA5551DataToBGRA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_BGRA8_EXT:
        loadBGRADataToBGRA(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:
        loadRGBFloatDataToRGBA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGB16F_EXT:
        loadRGBHalfFloatDataToRGBA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGBA32F_EXT:
        loadRGBAFloatDataToRGBA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      case GL_RGBA16F_EXT:
        loadRGBAHalfFloatDataToRGBA(width, height, inputPitch, input, locked.Pitch, locked.pBits);
        break;
      default: UNREACHABLE(); 
    }

    unlock();
}

void Image9::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 Image9::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(0);

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

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

    IDirect3DDevice9 *device = mRenderer->getDevice();

    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 gl::error(GL_OUT_OF_MEMORY);
    }

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

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

}