C++ Box::getDepth方法代码示例

    PixelBox GL3PlusHardwarePixelBuffer::lockImpl( const Image::Box &lockBox, LockOptions options )
    {
        //Allocate memory for the entire image, as the buffer
        //maynot be freed and be reused in subsequent calls.
        allocateBuffer( PixelUtil::getMemorySize( mWidth, mHeight, mDepth, mFormat ) );

        mBuffer = PixelBox( lockBox.getWidth(), lockBox.getHeight(),
                            lockBox.getDepth(), mFormat, mBuffer.data );
        mCurrentLock = mBuffer;
        mCurrentLock.left    = lockBox.left;
        mCurrentLock.right  += lockBox.left;
        mCurrentLock.top     = lockBox.top;
        mCurrentLock.bottom += lockBox.top;

        if(options != HardwareBuffer::HBL_DISCARD)
        {
            // Download the old contents of the texture
            download( mCurrentLock );
        }
        mCurrentLockOptions = options;
        mLockedBox = lockBox;
        mCurrentLock = mBuffer;

        return mBuffer;
    }

    void GLES2HardwarePixelBuffer::blitFromMemory(const PixelBox &src, const Image::Box &dstBox)
    {
        if (!mBuffer.contains(dstBox))
        {
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
                        "Destination box out of range",
                        "GLES2HardwarePixelBuffer::blitFromMemory");
        }

        PixelBox scaled;

        if (src.getWidth() != dstBox.getWidth() ||
            src.getHeight() != dstBox.getHeight() ||
            src.getDepth() != dstBox.getDepth())
        {
            // Scale to destination size.
            // This also does pixel format conversion if needed
            allocateBuffer();
            scaled = mBuffer.getSubVolume(dstBox);
            Image::scale(src, scaled, Image::FILTER_BILINEAR);
        }
#if OGRE_PLATFORM != OGRE_PLATFORM_APPLE_IOS
        else if ((src.format != mFormat) ||                 
                 ((GLES2PixelUtil::getGLOriginFormat(src.format) == 0) && (src.format != PF_R8G8B8)))
#else
        else if (GLES2PixelUtil::getGLOriginFormat(src.format) == 0)
#endif
        {
            // Extents match, but format is not accepted as valid source format for GL
            // do conversion in temporary buffer
            allocateBuffer();
            scaled = mBuffer.getSubVolume(dstBox);
            PixelUtil::bulkPixelConversion(src, scaled);
        }
        else
        {
            allocateBuffer();
            // No scaling or conversion needed
            scaled = src;
            if (src.format == PF_R8G8B8)
            {
                scaled.format = PF_B8G8R8;
                PixelUtil::bulkPixelConversion(src, scaled);
            }
#if OGRE_PLATFORM == OGRE_PLATFORM_NACL
            if (src.format == PF_A8R8G8B8)
            {
                scaled.format = PF_A8B8G8R8;
                PixelUtil::bulkPixelConversion(src, scaled);
            }
#endif
        }

        upload(scaled, dstBox);
        freeBuffer();
    }

//-----------------------------------------------------------------------------
void D3D11HardwarePixelBuffer::blitToMemory(const Image::Box &srcBox, const PixelBox &dst)
{
    // Decide on pixel format of temp surface
    PixelFormat tmpFormat = mFormat;
    if(D3D11Mappings::_getPF(dst.format) != DXGI_FORMAT_UNKNOWN)
    {
        tmpFormat = dst.format;
    }
    assert(srcBox.getDepth() == 1 && dst.getDepth() == 1);

    //This is a pointer to the texture we're trying to copy
    //Only implemented for 2D at the moment...
    ID3D11Texture2D *textureResource = mParentTexture->GetTex2D();

    // get the description of the texture
    D3D11_TEXTURE2D_DESC desc = {0};
    textureResource->GetDesc( &desc );
    //Alter the description to set up a staging texture
    desc.Usage = D3D11_USAGE_STAGING;
    //This texture is not bound to any part of the pipeline
    desc.BindFlags = 0;
    //Allow CPU Access
    desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
    //No Misc Flags
    desc.MiscFlags = 0;
    //Create the staging texture
    ID3D11Texture2D* pStagingTexture = NULL;
    mDevice->CreateTexture2D( &desc, NULL, &pStagingTexture );
    //Copy our texture into the staging texture
    mDevice.GetImmediateContext()->CopyResource( pStagingTexture, textureResource );
    //Create a mapped resource and map the staging texture to the resource
    D3D11_MAPPED_SUBRESOURCE mapped = {0};
    mDevice.GetImmediateContext()->Map( pStagingTexture, 0, D3D11_MAP_READ , 0, &mapped );

    // read the data out of the texture.
    unsigned int rPitch = mapped.RowPitch;
    BYTE *data = ((BYTE *)mapped.pData);

    //Using existing OGRE functions
    DXGI_MAPPED_RECT lrect;
    lrect.pBits = data;
    lrect.Pitch = rPitch;


    PixelBox locked(dst.getWidth(), dst.getHeight(), dst.getDepth(), tmpFormat);
    fromD3DLock(locked, lrect);
    PixelUtil::bulkPixelConversion(locked, dst);

    //Release the staging texture
    mDevice.GetImmediateContext()->Unmap( pStagingTexture, 0 );
    pStagingTexture->Release();
}

    void GLESHardwarePixelBuffer::blitToMemory(const Image::Box &srcBox, const PixelBox &dst)
    {
        if (!mBuffer.contains(srcBox))
        {
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
                        "source box out of range",
                        "GLESHardwarePixelBuffer::blitToMemory");
        }

        if (srcBox.left == 0 && srcBox.right == getWidth() &&
            srcBox.top == 0 && srcBox.bottom == getHeight() &&
            srcBox.front == 0 && srcBox.back == getDepth() &&
            dst.getWidth() == getWidth() &&
            dst.getHeight() == getHeight() &&
            dst.getDepth() == getDepth() &&
            GLESPixelUtil::getGLOriginFormat(dst.format) != 0)
        {
            // The direct case: the user wants the entire texture in a format supported by GL
            // so we don't need an intermediate buffer
            download(dst);
        }
        else
        {
            // Use buffer for intermediate copy
            allocateBuffer();
            // Download entire buffer
            download(mBuffer);
            if(srcBox.getWidth() != dst.getWidth() ||
                srcBox.getHeight() != dst.getHeight() ||
                srcBox.getDepth() != dst.getDepth())
            {
                // We need scaling
                Image::scale(mBuffer.getSubVolume(srcBox), dst, Image::FILTER_BILINEAR);
            }
            else
            {
                // Just copy the bit that we need
                PixelUtil::bulkPixelConversion(mBuffer.getSubVolume(srcBox), dst);
            }
            freeBuffer();
        }
    }

    void GL3PlusHardwarePixelBuffer::blitFromMemory(const PixelBox &src, const Image::Box &dstBox)
    {
        if (!mBuffer.contains(dstBox))
        {
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
                        "Destination box out of range",
                        "GL3PlusHardwarePixelBuffer::blitFromMemory");
        }

        PixelBox scaled;

        if (src.getWidth() != dstBox.getWidth() ||
            src.getHeight() != dstBox.getHeight() ||
            src.getDepth() != dstBox.getDepth())
        {
            // Scale to destination size.
            // This also does pixel format conversion if needed.
            allocateBuffer( mSizeInBytes );
            scaled = mBuffer.getSubVolume(dstBox);
            Image::scale(src, scaled, Image::FILTER_BILINEAR);
        }
        else if (GL3PlusPixelUtil::getGLOriginFormat(src.format) == 0)
        {
            // Extents match, but format is not accepted as valid
            // source format for GL. Do conversion in temporary buffer.
            allocateBuffer( mSizeInBytes );
            scaled = mBuffer.getSubVolume(dstBox);
            PixelUtil::bulkPixelConversion(src, scaled);
        }
        else
        {
            allocateBuffer( mSizeInBytes );
            // No scaling or conversion needed.
            scaled = src;
        }

        upload(scaled, dstBox);
        freeBuffer();
    }

    //-----------------------------------------------------------------------------  
    // blitFromMemory doing hardware trilinear scaling
    void GLESTextureBuffer::blitFromMemory(const PixelBox &src_orig, const Image::Box &dstBox)
    {
        // Fall back to normal GLHardwarePixelBuffer::blitFromMemory in case 
        // - FBO is not supported
        // - Either source or target is luminance due doesn't looks like supported by hardware
        // - the source dimensions match the destination ones, in which case no scaling is needed
        if(!GL_OES_framebuffer_object ||
           PixelUtil::isLuminance(src_orig.format) ||
           PixelUtil::isLuminance(mFormat) ||
           (src_orig.getWidth() == dstBox.getWidth() &&
            src_orig.getHeight() == dstBox.getHeight() &&
            src_orig.getDepth() == dstBox.getDepth()))
        {
            GLESHardwarePixelBuffer::blitFromMemory(src_orig, dstBox);
            return;
        }
        if(!mBuffer.contains(dstBox))
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Destination box out of range",
                        "GLESTextureBuffer::blitFromMemory");
        // For scoped deletion of conversion buffer
        MemoryDataStreamPtr buf;
        PixelBox src;
        
        // First, convert the srcbox to a OpenGL compatible pixel format
        if(GLESPixelUtil::getGLOriginFormat(src_orig.format) == 0)
        {
            // Convert to buffer internal format
            buf.bind(OGRE_NEW MemoryDataStream(PixelUtil::getMemorySize(src_orig.getWidth(), src_orig.getHeight(), src_orig.getDepth(),
                                                                   mFormat)));
            src = PixelBox(src_orig.getWidth(), src_orig.getHeight(), src_orig.getDepth(), mFormat, buf->getPtr());
            PixelUtil::bulkPixelConversion(src_orig, src);
        }
        else
        {
            // No conversion needed
            src = src_orig;
        }
        
        // Create temporary texture to store source data
        GLuint id;
        GLenum target = GL_TEXTURE_2D;
        GLsizei width = GLESPixelUtil::optionalPO2(src.getWidth());
        GLsizei height = GLESPixelUtil::optionalPO2(src.getHeight());
        GLenum format = GLESPixelUtil::getClosestGLInternalFormat(src.format);
        GLenum datatype = GLESPixelUtil::getGLOriginDataType(src.format);
        // Generate texture name
        glGenTextures(1, &id);
        GL_CHECK_ERROR;
        
        // Set texture type
        glBindTexture(target, id);
        GL_CHECK_ERROR;
        
        // Set automatic mipmap generation; nice for minimisation
        glTexParameteri(target, GL_GENERATE_MIPMAP, GL_TRUE );
        GL_CHECK_ERROR;

        // Allocate texture memory
        glTexImage2D(target, 0, format, width, height, 0, format, datatype, 0);
        GL_CHECK_ERROR;

        // GL texture buffer
        GLESTextureBuffer tex(BLANKSTRING, target, id, width, height, format, src.format,
                              0, 0, (Usage)(TU_AUTOMIPMAP|HBU_STATIC_WRITE_ONLY), false, false, 0);
        
        // Upload data to 0,0,0 in temporary texture
        Image::Box tempTarget(0, 0, 0, src.getWidth(), src.getHeight(), src.getDepth());
        tex.upload(src, tempTarget);
        
        // Blit
        blitFromTexture(&tex, tempTarget, dstBox);
        
        // Delete temp texture
        glDeleteTextures(1, &id);
        GL_CHECK_ERROR;
    }

    //-----------------------------------------------------------------------------  
    // Very fast texture-to-texture blitter and hardware bi/trilinear scaling implementation using FBO
    // Destination texture must be 2D
    // Source texture must be 2D
    // Supports compressed formats as both source and destination format, it will use the hardware DXT compressor
    // if available.
    // @author W.J. van der Laan
    void GLESTextureBuffer::blitFromTexture(GLESTextureBuffer *src, const Image::Box &srcBox, const Image::Box &dstBox)
    {
        if(Root::getSingleton().getRenderSystem()->getCapabilities()->hasCapability(RSC_FBO) == false)
        {
            // the following code depends on FBO support, it crashes if FBO is not supported.
            // TODO - write PBUFFER version of this function or a version that doesn't require FBO
            return; // for now - do nothing.
        }

//        std::cerr << "GLESTextureBuffer::blitFromTexture " <<
//        src->mTextureID << ":" << srcBox.left << "," << srcBox.top << "," << srcBox.right << "," << srcBox.bottom << " " << 
//        mTextureID << ":" << dstBox.left << "," << dstBox.top << "," << dstBox.right << "," << dstBox.bottom << std::endl;

        // Store reference to FBO manager
        GLESFBOManager *fboMan = static_cast<GLESFBOManager *>(GLESRTTManager::getSingletonPtr());
        
        // Save and clear GL state for rendering
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT |  GL_STENCIL_BUFFER_BIT);
        
        RenderSystem* rsys = Root::getSingleton().getRenderSystem();
        rsys->_disableTextureUnitsFrom(0);

        // Disable alpha, depth and scissor testing, disable blending, 
        // disable culling, disble lighting, disable fog and reset foreground
        // colour.
        glDisable(GL_ALPHA_TEST);
        glDisable(GL_DEPTH_TEST);
        glDisable(GL_SCISSOR_TEST);
        glDisable(GL_BLEND);
        glDisable(GL_CULL_FACE);
        glDisable(GL_LIGHTING);
        glDisable(GL_FOG);
        glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
        GL_CHECK_ERROR;

        // Save and reset matrices
        glMatrixMode(GL_MODELVIEW);
        glPushMatrix();
        glLoadIdentity();
        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
        glMatrixMode(GL_TEXTURE);
        glPushMatrix();
        glLoadIdentity();
        GL_CHECK_ERROR;
        
        // Set up source texture
        glBindTexture(src->mTarget, src->mTextureID);
        GL_CHECK_ERROR;
        
        // Set filtering modes depending on the dimensions and source
        if(srcBox.getWidth()==dstBox.getWidth() &&
           srcBox.getHeight()==dstBox.getHeight() &&
           srcBox.getDepth()==dstBox.getDepth())
        {
            // Dimensions match -- use nearest filtering (fastest and pixel correct)
            glTexParameteri(src->mTarget, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
            GL_CHECK_ERROR;
            glTexParameteri(src->mTarget, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
            GL_CHECK_ERROR;
        }
        else
        {
            // Dimensions don't match -- use bi or trilinear filtering depending on the
            // source texture.
            if(src->mUsage & TU_AUTOMIPMAP)
            {
                // Automatic mipmaps, we can safely use trilinear filter which
                // brings greatly imporoved quality for minimisation.
                glTexParameteri(src->mTarget, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
                GL_CHECK_ERROR;
                glTexParameteri(src->mTarget, GL_TEXTURE_MAG_FILTER, GL_LINEAR);    
                GL_CHECK_ERROR;
            }
            else
            {
                // Manual mipmaps, stay safe with bilinear filtering so that no
                // intermipmap leakage occurs.
                glTexParameteri(src->mTarget, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
                GL_CHECK_ERROR;
                glTexParameteri(src->mTarget, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
                GL_CHECK_ERROR;
            }
        }
        // Clamp to edge (fastest)
        glTexParameteri(src->mTarget, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        GL_CHECK_ERROR;
        glTexParameteri(src->mTarget, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        GL_CHECK_ERROR;
        
        // Store old binding so it can be restored later
        GLint oldfb;
//.........这里部分代码省略.........

	//-----------------------------------------------------------------------------  
	PixelBox D3D10HardwarePixelBuffer::lockImpl(const Image::Box lockBox,  LockOptions options)
	{
		// Check for misuse
		if(mUsage & TU_RENDERTARGET)
			OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "DirectX does not allow locking of or directly writing to RenderTargets. Use blitFromMemory if you need the contents.",
			"D3D10HardwarePixelBuffer::lockImpl");	
		// Set extents and format
		// Note that we do not carry over the left/top/front here, since the returned
		// PixelBox will be re-based from the locking point onwards
		PixelBox rval(lockBox.getWidth(), lockBox.getHeight(), lockBox.getDepth(), mFormat);
		// Set locking flags according to options
		D3D10_MAP  flags = D3D10_MAP_WRITE_DISCARD ;
		switch(options)
		{
		case HBL_DISCARD:
			// D3D only likes D3DLOCK_DISCARD if you created the texture with D3DUSAGE_DYNAMIC
			// debug runtime flags this up, could cause problems on some drivers
			if (mUsage & HBU_DYNAMIC)
				flags = D3D10_MAP_WRITE_DISCARD;
			break;
		case HBL_READ_ONLY:
			flags = D3D10_MAP_READ;
			break;
		default: 
			break;
		};

		mDevice.clearStoredErrorMessages();

		// TODO - check return values here
		switch(mParentTexture->getTextureType()) {
		case TEX_TYPE_1D:
			{

				mParentTexture->GetTex1D()->Map(static_cast<UINT>(mSubresourceIndex), flags, 0, &rval.data);
				if (mDevice.isError())
				{
					String errorDescription = mDevice.getErrorDescription();
					OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, 
						"D3D10 device cannot map 1D texture\nError Description:" + errorDescription,
						"D3D10HardwarePixelBuffer::lockImpl");
				}
			}
			break;
		case TEX_TYPE_CUBE_MAP:
		case TEX_TYPE_2D:
			{
				D3D10_MAPPED_TEXTURE2D mappedTex2D;
				mParentTexture->GetTex2D()->Map(static_cast<UINT>(mSubresourceIndex), flags, 0, &mappedTex2D);
				rval.data = mappedTex2D.pData;
				if (mDevice.isError())
				{
					String errorDescription = mDevice.getErrorDescription();
					OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, 
						"D3D10 device cannot map 1D texture\nError Description:" + errorDescription,
						"D3D10HardwarePixelBuffer::lockImpl");
				}
			}
			break;
		case TEX_TYPE_3D:
			{
				D3D10_MAPPED_TEXTURE3D mappedTex3D;
				mParentTexture->GetTex3D()->Map(static_cast<UINT>(mSubresourceIndex), flags, 0, &mappedTex3D);
				rval.data = mappedTex3D.pData;
				if (mDevice.isError())
				{
					String errorDescription = mDevice.getErrorDescription();
					OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, 
						"D3D10 device cannot map 1D texture\nError Description:" + errorDescription,
						"D3D10HardwarePixelBuffer::lockImpl");
				}
			}
			break;
		}




		return rval;
	}

	void D3D10HardwarePixelBuffer::blit(const HardwarePixelBufferSharedPtr &rsrc, const Image::Box &srcBox, const Image::Box &dstBox)
	{
		if (
			(srcBox.getWidth() != dstBox.getWidth())
			|| (srcBox.getHeight() != dstBox.getHeight())
			|| (srcBox.getDepth() != dstBox.getDepth())
			)
		{
			OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, 
				"D3D10 device cannot copy a subresource - source and dest size are not the same and they have to be the same in DX10.",
				"D3D10HardwarePixelBuffer::blit");
		}

		D3D10_BOX srcBoxDx10 = OgreImageBoxToDx10Box(srcBox);


		D3D10HardwarePixelBuffer * rsrcDx10 = static_cast<D3D10HardwarePixelBuffer *>(rsrc.get());

		switch(mParentTexture->getTextureType()) {
		case TEX_TYPE_1D:
			{

				mDevice->CopySubresourceRegion(
					mParentTexture->GetTex1D(), 
					static_cast<UINT>(mSubresourceIndex),
					static_cast<UINT>(dstBox.left),
					0,
					0,
					rsrcDx10->mParentTexture->GetTex1D(),
					static_cast<UINT>(rsrcDx10->mSubresourceIndex),
					&srcBoxDx10);
				if (mDevice.isError())
				{
					String errorDescription = mDevice.getErrorDescription();
					OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, 
						"D3D10 device cannot copy 1d subresource Region\nError Description:" + errorDescription,
						"D3D10HardwarePixelBuffer::blit");
				}			
			}
			break;
		case TEX_TYPE_CUBE_MAP:
		case TEX_TYPE_2D:
			{
				mDevice->CopySubresourceRegion(
					mParentTexture->GetTex2D(), 
					static_cast<UINT>(mSubresourceIndex),
					static_cast<UINT>(dstBox.left),
					static_cast<UINT>(dstBox.top),
					mFace,
					rsrcDx10->mParentTexture->GetTex2D(),
					static_cast<UINT>(rsrcDx10->mSubresourceIndex),
					&srcBoxDx10);
				if (mDevice.isError())
				{
					String errorDescription = mDevice.getErrorDescription();
					OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, 
						"D3D10 device cannot copy 2d subresource Region\nError Description:" + errorDescription,
						"D3D10HardwarePixelBuffer::blit");
				}
			}
			break;
		case TEX_TYPE_3D:
			{
				mDevice->CopySubresourceRegion(
					mParentTexture->GetTex2D(), 
					static_cast<UINT>(mSubresourceIndex),
					static_cast<UINT>(dstBox.left),
					static_cast<UINT>(dstBox.top),
					static_cast<UINT>(dstBox.front),
					rsrcDx10->mParentTexture->GetTex2D(),
					static_cast<UINT>(rsrcDx10->mSubresourceIndex),
					&srcBoxDx10);
				if (mDevice.isError())
				{
					String errorDescription = mDevice.getErrorDescription();
					OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, 
						"D3D10 device cannot copy 3d subresource Region\nError Description:" + errorDescription,
						"D3D10HardwarePixelBuffer::blit");
				}
			}
			break;
		}


		_genMipmaps();

	}

    //-----------------------------------------------------------------------------  
    // Very fast texture-to-texture blitter and hardware bi/trilinear scaling implementation using FBO
    // Destination texture must be 1D, 2D, 3D, or Cube
    // Source texture must be 1D, 2D or 3D
    // Supports compressed formats as both source and destination format, it will use the hardware DXT compressor
    // if available.
    // @author W.J. van der Laan
    void GLES2TextureBuffer::blitFromTexture(GLES2TextureBuffer *src, const Image::Box &srcBox, const Image::Box &dstBox)
    {
		return; // todo - add a shader attach...
//        std::cerr << "GLES2TextureBuffer::blitFromTexture " <<
//        src->mTextureID << ":" << srcBox.left << "," << srcBox.top << "," << srcBox.right << "," << srcBox.bottom << " " << 
//        mTextureID << ":" << dstBox.left << "," << dstBox.top << "," << dstBox.right << "," << dstBox.bottom << std::endl;

        // Store reference to FBO manager
        GLES2FBOManager *fboMan = static_cast<GLES2FBOManager *>(GLES2RTTManager::getSingletonPtr());
        
        RenderSystem* rsys = Root::getSingleton().getRenderSystem();
        rsys->_disableTextureUnitsFrom(0);
		glActiveTexture(GL_TEXTURE0);

        // Disable alpha, depth and scissor testing, disable blending, 
        // and disable culling
        glDisable(GL_DEPTH_TEST);
        glDisable(GL_SCISSOR_TEST);
        glDisable(GL_BLEND);
        glDisable(GL_CULL_FACE);

        // Set up source texture
        glBindTexture(src->mTarget, src->mTextureID);
        GL_CHECK_ERROR;
        
        // Set filtering modes depending on the dimensions and source
        if(srcBox.getWidth()==dstBox.getWidth() &&
           srcBox.getHeight()==dstBox.getHeight() &&
           srcBox.getDepth()==dstBox.getDepth())
        {
            // Dimensions match -- use nearest filtering (fastest and pixel correct)
            glTexParameteri(src->mTarget, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
            GL_CHECK_ERROR;
            glTexParameteri(src->mTarget, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
            GL_CHECK_ERROR;
        }
        else
        {
            // Dimensions don't match -- use bi or trilinear filtering depending on the
            // source texture.
            if(src->mUsage & TU_AUTOMIPMAP)
            {
                // Automatic mipmaps, we can safely use trilinear filter which
                // brings greatly improved quality for minimisation.
                glTexParameteri(src->mTarget, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
                GL_CHECK_ERROR;
                glTexParameteri(src->mTarget, GL_TEXTURE_MAG_FILTER, GL_LINEAR);    
                GL_CHECK_ERROR;
            }
            else
            {
                // Manual mipmaps, stay safe with bilinear filtering so that no
                // intermipmap leakage occurs.
                glTexParameteri(src->mTarget, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
                GL_CHECK_ERROR;
                glTexParameteri(src->mTarget, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
                GL_CHECK_ERROR;
            }
        }
        // Clamp to edge (fastest)
        glTexParameteri(src->mTarget, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        GL_CHECK_ERROR;
        glTexParameteri(src->mTarget, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        GL_CHECK_ERROR;
        
        // Store old binding so it can be restored later
        GLint oldfb;
        glGetIntegerv(GL_FRAMEBUFFER_BINDING, &oldfb);
        GL_CHECK_ERROR;

        // Set up temporary FBO
        glBindFramebuffer(GL_FRAMEBUFFER, fboMan->getTemporaryFBO());
        GL_CHECK_ERROR;

        GLuint tempTex = 0;
        if(!fboMan->checkFormat(mFormat))
        {
            // If target format not directly supported, create intermediate texture
            GLenum tempFormat = GLES2PixelUtil::getClosestGLInternalFormat(fboMan->getSupportedAlternative(mFormat));
            glGenTextures(1, &tempTex);
            GL_CHECK_ERROR;
            glBindTexture(GL_TEXTURE_2D, tempTex);
            GL_CHECK_ERROR;
#if GL_APPLE_texture_max_level
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL_APPLE, 0);
            GL_CHECK_ERROR;
#endif
            // Allocate temporary texture of the size of the destination area
            glTexImage2D(GL_TEXTURE_2D, 0, tempFormat, 
                         GLES2PixelUtil::optionalPO2(dstBox.getWidth()), GLES2PixelUtil::optionalPO2(dstBox.getHeight()), 
                         0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
            GL_CHECK_ERROR;
            glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
//.........这里部分代码省略.........

//-----------------------------------------------------------------------------
PixelBox D3D11HardwarePixelBuffer::lockImpl(const Image::Box lockBox,  LockOptions options)
{
    // Check for misuse
    if(mUsage & TU_RENDERTARGET)
        OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "DirectX does not allow locking of or directly writing to RenderTargets. Use blitFromMemory if you need the contents.",
                    "D3D11HardwarePixelBuffer::lockImpl");

    mLockBox = lockBox;

    // Set extents and format
    // Note that we do not carry over the left/top/front here, since the returned
    // PixelBox will be re-based from the locking point onwards
    PixelBox rval(lockBox.getWidth(), lockBox.getHeight(), lockBox.getDepth(), mFormat);
    // Set locking flags according to options
    D3D11_MAP  flags = D3D11_MAP_WRITE_DISCARD ;
    switch(options)
    {
    case HBL_NO_OVERWRITE:
        flags = D3D11_MAP_WRITE_NO_OVERWRITE;
        break;
    case HBL_NORMAL:
        flags = D3D11_MAP_READ_WRITE;
        break;
    case HBL_DISCARD:
        flags = D3D11_MAP_WRITE_DISCARD;
        break;
    case HBL_READ_ONLY:
        flags = D3D11_MAP_READ;
        break;
    case HBL_WRITE_ONLY:
        flags = D3D11_MAP_WRITE;
        break;
    default:
        break;
    };

    size_t offset = 0;

    if(mUsage == HBU_STATIC || mUsage & HBU_DYNAMIC)
    {
        if(mUsage == HBU_STATIC || options == HBL_READ_ONLY || options == HBL_NORMAL || options == HBL_WRITE_ONLY)
            rval.data = _mapstagingbuffer(flags);
        else
            _map(mParentTexture->getTextureResource(), flags, rval);

        // calculate the offset in bytes
        offset = D3D11Mappings::_getSizeInBytes(rval.format, rval.left, rval.front);
        // add the offset, so the right memory will be changed
        //rval.data = static_cast<int*>(rval.data) + offset;
    }
    else
    {
        size_t sizeOfImage = rval.getConsecutiveSize();
        mDataForStaticUsageLock = new int8[sizeOfImage];
        rval.data = mDataForStaticUsageLock;
    }
    // save without offset
    mCurrentLock = rval;
    mCurrentLockOptions = options;

    // add the offset, so the right memory will be changed
    rval.data = static_cast<int*>(rval.data) + offset;

    return rval;
}

    //-----------------------------------------------------------------------------  
    // blitFromMemory doing hardware trilinear scaling
    void GLES2TextureBuffer::blitFromMemory(const PixelBox &src_orig, const Image::Box &dstBox)
    {
        // Fall back to normal GLHardwarePixelBuffer::blitFromMemory in case 
        // - FBO is not supported
        // - Either source or target is luminance due doesn't looks like supported by hardware
        // - the source dimensions match the destination ones, in which case no scaling is needed
        // TODO: Check that extension is NOT available
        if(PixelUtil::isLuminance(src_orig.format) ||
           PixelUtil::isLuminance(mFormat) ||
           (src_orig.getWidth() == dstBox.getWidth() &&
            src_orig.getHeight() == dstBox.getHeight() &&
            src_orig.getDepth() == dstBox.getDepth()))
        {
            GLES2HardwarePixelBuffer::blitFromMemory(src_orig, dstBox);
            return;
        }
        if(!mBuffer.contains(dstBox))
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Destination box out of range",
                        "GLES2TextureBuffer::blitFromMemory");
        // For scoped deletion of conversion buffer
        MemoryDataStreamPtr buf;
        PixelBox src;
        
        // First, convert the srcbox to a OpenGL compatible pixel format
        if(GLES2PixelUtil::getGLOriginFormat(src_orig.format) == 0)
        {
            // Convert to buffer internal format
            buf.bind(OGRE_NEW MemoryDataStream(PixelUtil::getMemorySize(src_orig.getWidth(), src_orig.getHeight(),
                                                                        src_orig.getDepth(), mFormat)));
            src = PixelBox(src_orig.getWidth(), src_orig.getHeight(), src_orig.getDepth(), mFormat, buf->getPtr());
            PixelUtil::bulkPixelConversion(src_orig, src);
        }
        else
        {
            // No conversion needed
            src = src_orig;
        }
        
        // Create temporary texture to store source data
        GLuint id;
        GLenum target =
#if OGRE_NO_GLES3_SUPPORT == 0
        (src.getDepth() != 1) ? GL_TEXTURE_3D :
#endif
            GL_TEXTURE_2D;

        GLsizei width = GLES2PixelUtil::optionalPO2(src.getWidth());
        GLsizei height = GLES2PixelUtil::optionalPO2(src.getHeight());
        GLenum format = GLES2PixelUtil::getClosestGLInternalFormat(src.format);
        GLenum datatype = GLES2PixelUtil::getGLOriginDataType(src.format);

        // Generate texture name
        OGRE_CHECK_GL_ERROR(glGenTextures(1, &id));
        
        // Set texture type
        OGRE_CHECK_GL_ERROR(glBindTexture(target, id));

#if GL_APPLE_texture_max_level && OGRE_PLATFORM != OGRE_PLATFORM_NACL
        OGRE_CHECK_GL_ERROR(glTexParameteri(target, GL_TEXTURE_MAX_LEVEL_APPLE, 1000 ));
#elif OGRE_NO_GLES3_SUPPORT == 0
        OGRE_CHECK_GL_ERROR(glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, 1000 ));
#endif

        // Allocate texture memory
#if OGRE_NO_GLES3_SUPPORT == 0
        if(target == GL_TEXTURE_3D || target == GL_TEXTURE_2D_ARRAY)
            glTexImage3D(target, 0, src.format, src.getWidth(), src.getHeight(), src.getDepth(), 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
        else
#endif
            OGRE_CHECK_GL_ERROR(glTexImage2D(target, 0, format, width, height, 0, format, datatype, 0));

        // GL texture buffer
        GLES2TextureBuffer tex(StringUtil::BLANK, target, id, width, height, format, src.format,
                              0, 0, (Usage)(TU_AUTOMIPMAP|HBU_STATIC_WRITE_ONLY), false, false, 0);
        
        // Upload data to 0,0,0 in temporary texture
        Image::Box tempTarget(0, 0, 0, src.getWidth(), src.getHeight(), src.getDepth());
        tex.upload(src, tempTarget);
        
        // Blit
        blitFromTexture(&tex, tempTarget, dstBox);
        
        // Delete temp texture
        OGRE_CHECK_GL_ERROR(glDeleteTextures(1, &id));
    }