C++ PixelBox::getDepth方法代码示例

    //-----------------------------------------------------------------------
    void ILUtil::toOgre(const PixelBox &dst) 
    {
		if(!dst.isConsecutive())
			OGRE_EXCEPT( Exception::ERR_NOT_IMPLEMENTED,
                "Destination must currently be consecutive",
                "ILUtil::ilToOgre" ) ;
		if(dst.getWidth() != static_cast<size_t>(ilGetInteger( IL_IMAGE_WIDTH )) ||
        	dst.getHeight() != static_cast<size_t>(ilGetInteger( IL_IMAGE_HEIGHT )) ||
        	dst.getDepth() != static_cast<size_t>(ilGetInteger( IL_IMAGE_DEPTH )))
			OGRE_EXCEPT( Exception::ERR_INVALIDPARAMS,
                "Destination dimensions must equal IL dimension",
                "ILUtil::ilToOgre" ) ;
        
        int ilfmt = ilGetInteger( IL_IMAGE_FORMAT );
        int iltp = ilGetInteger( IL_IMAGE_TYPE );

		// Check if in-memory format just matches
		// If yes, we can just copy it and save conversion
		ILFormat ifmt = OgreFormat2ilFormat( dst.format );
		if(ifmt.format == ilfmt && ILabs(ifmt.type) == ILabs(iltp)) {
            memcpy(dst.data, ilGetData(), ilGetInteger( IL_IMAGE_SIZE_OF_DATA )); 
            return;
        }
		// Try if buffer is in a known OGRE format so we can use OGRE its
		// conversion routines
		PixelFormat bufFmt = ilFormat2OgreFormat((int)ilfmt, (int)iltp);
		
		ifmt = OgreFormat2ilFormat( bufFmt );
		if(ifmt.format == ilfmt && ILabs(ifmt.type) == ILabs(iltp))
		{
			// IL format matches another OGRE format
			PixelBox src(dst.getWidth(), dst.getHeight(), dst.getDepth(), bufFmt, ilGetData());
			PixelUtil::bulkPixelConversion(src, dst);
			return;
		}
		
        // Thee extremely slow method
        if(iltp == IL_UNSIGNED_BYTE || iltp == IL_BYTE) 
        {
            ilToOgreInternal(static_cast<uint8*>(dst.data), dst.format, (uint8)0x00,(uint8)0x00,(uint8)0x00,(uint8)0xFF);
        } 
        else if(iltp == IL_FLOAT)
        {
            ilToOgreInternal(static_cast<uint8*>(dst.data), dst.format, 0.0f,0.0f,0.0f,1.0f);          
        }
		else if(iltp == IL_SHORT || iltp == IL_UNSIGNED_SHORT)
        {
			ilToOgreInternal(static_cast<uint8*>(dst.data), dst.format, 
				(uint16)0x0000,(uint16)0x0000,(uint16)0x0000,(uint16)0xFFFF); 
        }
        else 
        {
            OGRE_EXCEPT( Exception::ERR_NOT_IMPLEMENTED,
                "Cannot convert this DevIL type",
                "ILUtil::ilToOgre" ) ;
        }
    }

//-----------------------------------------------------------------------------
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 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();
    }

// Convert Ogre pixelbox extent to D3D rectangle
RECT toD3DRECTExtent(const PixelBox &lockBox)
{
    RECT prect;
    assert(lockBox.getDepth() == 1);
    prect.left = 0;
    prect.right = static_cast<LONG>(lockBox.getWidth());
    prect.top = 0;
    prect.bottom = static_cast<LONG>(lockBox.getHeight());
    return prect;
}

    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();
        }
    }

// Convert Ogre pixelbox extent to D3D box
D3DBOX toD3DBOXExtent(const PixelBox &lockBox)
{
    D3DBOX pbox;
    pbox.Left = 0;
    pbox.Right = static_cast<UINT>(lockBox.getWidth());
    pbox.Top = 0;
    pbox.Bottom = static_cast<UINT>(lockBox.getHeight());
    pbox.Front = 0;
    pbox.Back = static_cast<UINT>(lockBox.getDepth());
    return pbox;
}

    void EGLWindow::copyContentsToMemory(const Box& src, const PixelBox &dst, FrameBuffer buffer)
    {
        if(src.right > mWidth || src.bottom > mHeight || src.front != 0 || src.back != 1
        || dst.getWidth() != src.getWidth() || dst.getHeight() != src.getHeight() || dst.getDepth() != 1
#if OGRE_NO_GLES3_SUPPORT == 1
        || dst.getWidth() != dst.rowPitch /* GLES2 does not support GL_PACK_ROW_LENGTH, TODO: check for GL_NV_pack_subimage availability */
#endif
        )
        {
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Invalid box.", "EGLWindow::copyContentsToMemory");
        }

        if (buffer == FB_AUTO)
        {
            buffer = mIsFullScreen? FB_FRONT : FB_BACK;
        }

        GLenum format = GLESPixelUtil::getGLOriginFormat(dst.format);
        GLenum type = GLESPixelUtil::getGLOriginDataType(dst.format);

        if ((format == 0) || (type == 0))
        {
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Unsupported format.", "EGLWindow::copyContentsToMemory");
        }


        // Switch context if different from current one
        RenderSystem* rsys = Root::getSingleton().getRenderSystem();
        rsys->_setViewport(this->getViewport(0));

#if OGRE_NO_GLES3_SUPPORT == 0
        if(dst.getWidth() != dst.rowPitch)
            glPixelStorei(GL_PACK_ROW_LENGTH, dst.rowPitch);
#endif
        // Must change the packing to ensure no overruns!
        glPixelStorei(GL_PACK_ALIGNMENT, 1);

        //glReadBuffer((buffer == FB_FRONT)? GL_FRONT : GL_BACK);
        glReadPixels((GLint)src.left, (GLint)(mHeight - src.bottom),
                     (GLsizei)src.getWidth(), (GLsizei)src.getHeight(),
                     format, type, dst.getTopLeftFrontPixelPtr());

        // restore default alignment
        glPixelStorei(GL_PACK_ALIGNMENT, 4);
#if OGRE_NO_GLES3_SUPPORT == 0
        glPixelStorei(GL_PACK_ROW_LENGTH, 0);
#endif
        
        PixelUtil::bulkPixelVerticalFlip(dst);
    }

    void EGLWindow::copyContentsToMemory(const Box& src, const PixelBox &dst, FrameBuffer buffer)
    {
        if(src.right > mWidth || src.bottom > mHeight || src.front != 0 || src.back != 1
        || dst.getWidth() != src.getWidth() || dst.getHeight() != src.getHeight() || dst.getDepth() != 1)
        {
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Invalid box.", "EGLWindow::copyContentsToMemory");
        }

        if (buffer == FB_AUTO)
        {
            buffer = mIsFullScreen? FB_FRONT : FB_BACK;
        }

        static_cast<GLRenderSystemCommon*>(Root::getSingleton().getRenderSystem())
                ->_copyContentsToMemory(getViewport(0), src, dst, buffer);
    }

    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();
    }

    //-----------------------------------------------------------------------------  
    void GLES2TextureBuffer::download(const PixelBox &data)
    {
#if 0 || defined(GL_NV_get_tex_image)
        if(data.getWidth() != getWidth() ||
            data.getHeight() != getHeight() ||
            data.getDepth() != getDepth())
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "only download of entire buffer is supported by GL",
                "GLTextureBuffer::download");
        glBindTexture( mTarget, mTextureID );
        if(PixelUtil::isCompressed(data.format))
        {
            if(data.format != mFormat || !data.isConsecutive())
                OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, 
                "Compressed images must be consecutive, in the source format",
                "GLTextureBuffer::download");
            // Data must be consecutive and at beginning of buffer as PixelStorei not allowed
            // for compressed formate
            glGetCompressedTexImageNV(mFaceTarget, mLevel, data.data);
        } 
        else
        {
            if((data.getWidth()*PixelUtil::getNumElemBytes(data.format)) & 3) {
                // Standard alignment of 4 is not right
                glPixelStorei(GL_PACK_ALIGNMENT, 1);
            }
            // We can only get the entire texture
            glGetTexImageNV(mFaceTarget, mLevel, 
                GLES2PixelUtil::getGLOriginFormat(data.format), GLES2PixelUtil::getGLOriginDataType(data.format),
                data.data);
            // Restore defaults
            glPixelStorei(GL_PACK_ALIGNMENT, 4);
        }
#else
        OGRE_EXCEPT(Exception::ERR_NOT_IMPLEMENTED, 
                    "Downloading texture buffers is not supported by OpenGL ES",
                    "GLES2TextureBuffer::download");
#endif
    }

    //-----------------------------------------------------------------------
    void Image::scale(const PixelBox &src, const PixelBox &scaled, Filter filter) 
    {
        assert(PixelUtil::isAccessible(src.format));
        assert(PixelUtil::isAccessible(scaled.format));
        MemoryDataStreamPtr buf; // For auto-delete
        PixelBox temp;
        switch (filter) 
        {
        default:
        case FILTER_NEAREST:
            if(src.format == scaled.format) 
            {
                // No intermediate buffer needed
                temp = scaled;
            }
            else
            {
                // Allocate temporary buffer of destination size in source format 
                temp = PixelBox(scaled.getWidth(), scaled.getHeight(), scaled.getDepth(), src.format);
                buf.bind(OGRE_NEW MemoryDataStream(temp.getConsecutiveSize()));
                temp.data = buf->getPtr();
            }
            // super-optimized: no conversion
            switch (PixelUtil::getNumElemBytes(src.format)) 
            {
            case 1: NearestResampler<1>::scale(src, temp); break;
            case 2: NearestResampler<2>::scale(src, temp); break;
            case 3: NearestResampler<3>::scale(src, temp); break;
            case 4: NearestResampler<4>::scale(src, temp); break;
            case 6: NearestResampler<6>::scale(src, temp); break;
            case 8: NearestResampler<8>::scale(src, temp); break;
            case 12: NearestResampler<12>::scale(src, temp); break;
            case 16: NearestResampler<16>::scale(src, temp); break;
            default:
                // never reached
                assert(false);
            }
            if(temp.data != scaled.data)
            {
                // Blit temp buffer
                PixelUtil::bulkPixelConversion(temp, scaled);
            }
            break;

        case FILTER_LINEAR:
        case FILTER_BILINEAR:
            switch (src.format) 
            {
            case PF_L8: case PF_A8: case PF_BYTE_LA:
            case PF_R8G8B8: case PF_B8G8R8:
            case PF_R8G8B8A8: case PF_B8G8R8A8:
            case PF_A8B8G8R8: case PF_A8R8G8B8:
            case PF_X8B8G8R8: case PF_X8R8G8B8:
                if(src.format == scaled.format) 
                {
                    // No intermediate buffer needed
                    temp = scaled;
                }
                else
                {
                    // Allocate temp buffer of destination size in source format 
                    temp = PixelBox(scaled.getWidth(), scaled.getHeight(), scaled.getDepth(), src.format);
                    buf.bind(OGRE_NEW MemoryDataStream(temp.getConsecutiveSize()));
                    temp.data = buf->getPtr();
                }
                // super-optimized: byte-oriented math, no conversion
                switch (PixelUtil::getNumElemBytes(src.format)) 
                {
                case 1: LinearResampler_Byte<1>::scale(src, temp); break;
                case 2: LinearResampler_Byte<2>::scale(src, temp); break;
                case 3: LinearResampler_Byte<3>::scale(src, temp); break;
                case 4: LinearResampler_Byte<4>::scale(src, temp); break;
                default:
                    // never reached
                    assert(false);
                }
                if(temp.data != scaled.data)
                {
                    // Blit temp buffer
                    PixelUtil::bulkPixelConversion(temp, scaled);
                }
                break;
            case PF_FLOAT32_RGB:
            case PF_FLOAT32_RGBA:
                if (scaled.format == PF_FLOAT32_RGB || scaled.format == PF_FLOAT32_RGBA)
                {
                    // float32 to float32, avoid unpack/repack overhead
                    LinearResampler_Float32::scale(src, scaled);
                    break;
                }
                // else, fall through
            default:
                // non-optimized: floating-point math, performs conversion but always works
                LinearResampler::scale(src, scaled);
            }
            break;
        }
    }

    //-----------------------------------------------------------------------------  
    // 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;
    }

    //-----------------------------------------------------------------------------  
    void GLES2TextureBuffer::download(const PixelBox &data)
    {
        if(data.getWidth() != getWidth() ||
           data.getHeight() != getHeight() ||
           data.getDepth() != getDepth())
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "only download of entire buffer is supported by GL ES",
                        "GLES2TextureBuffer::download");

        if(PixelUtil::isCompressed(data.format))
        {
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
                        "Compressed images cannot be downloaded by GL ES",
                        "GLES2TextureBuffer::download");
        }

        GLenum texBinding = GL_NONE;
        switch (mTarget)
        {
            case GL_TEXTURE_2D:
                texBinding = GL_TEXTURE_BINDING_2D;
                break;
            case GL_TEXTURE_CUBE_MAP:
                texBinding = GL_TEXTURE_BINDING_CUBE_MAP;
                break;
#if OGRE_NO_GLES3_SUPPORT == 0
            case GL_TEXTURE_3D:
                texBinding = GL_TEXTURE_BINDING_3D;
                break;
#endif
            default:
                return;
        }

#if OGRE_NO_GLES3_SUPPORT == 0
        if(data.getWidth() != data.rowPitch)
            OGRE_CHECK_GL_ERROR(glPixelStorei(GL_PACK_ROW_LENGTH, data.rowPitch));
        if(data.getHeight()*data.getWidth() != data.slicePitch)
            OGRE_CHECK_GL_ERROR(glPixelStorei(GL_PACK_IMAGE_HEIGHT, (data.slicePitch/data.getWidth())));
        if(data.left > 0 || data.top > 0 || data.front > 0)
            OGRE_CHECK_GL_ERROR(glPixelStorei(GL_PACK_SKIP_PIXELS, data.left + data.rowPitch * data.top + data.slicePitch * data.front));
#endif
        if((data.getWidth()*PixelUtil::getNumElemBytes(data.format)) & 3) {
            // Standard alignment of 4 is not right
            OGRE_CHECK_GL_ERROR(glPixelStorei(GL_PACK_ALIGNMENT, 1));
        }

        GLint currentFBO = 0;
        GLuint tempFBO = 0;
        OGRE_CHECK_GL_ERROR(glGetIntegerv(GL_FRAMEBUFFER_BINDING, &currentFBO));
        OGRE_CHECK_GL_ERROR(glGenFramebuffers(1, &tempFBO));
        OGRE_CHECK_GL_ERROR(glBindFramebuffer(GL_FRAMEBUFFER, tempFBO));

        switch (mTarget)
        {
            case GL_TEXTURE_2D:
            case GL_TEXTURE_CUBE_MAP:
                OGRE_CHECK_GL_ERROR(glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mTextureID, 0));
                OGRE_CHECK_GL_ERROR(glCheckFramebufferStatus(GL_FRAMEBUFFER));
                OGRE_CHECK_GL_ERROR(glReadPixels(0, 0, data.getWidth(), data.getHeight(),
                                                 GLES2PixelUtil::getGLOriginFormat(data.format),
                                                 GLES2PixelUtil::getGLOriginDataType(data.format), data.data));
                break;
#if OGRE_NO_GLES3_SUPPORT == 0
            case GL_TEXTURE_3D:
                for (int i = 0; i < desc.depth; i++) {
                    OGRE_CHECK_GL_ERROR(glFramebufferTexture3D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_3D, mTextureID, mLevel, i));
                    OGRE_CHECK_GL_ERROR(glReadPixels(0, 0, data.getWidth(), data.getHeight(), GL_RGBA, GL_UNSIGNED_BYTE, pixels + 4 * i * data.getWidth() * data.getHeight()));
                }
                break;
#endif
        }

        // Restore defaults
#if OGRE_NO_GLES3_SUPPORT == 0
        OGRE_CHECK_GL_ERROR(glPixelStorei(GL_PACK_ROW_LENGTH, 0));
        OGRE_CHECK_GL_ERROR(glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0));
        OGRE_CHECK_GL_ERROR(glPixelStorei(GL_PACK_SKIP_PIXELS, 0));
#endif
        OGRE_CHECK_GL_ERROR(glPixelStorei(GL_PACK_ALIGNMENT, 4));

        OGRE_CHECK_GL_ERROR(glBindFramebuffer(GL_FRAMEBUFFER, currentFBO));
        OGRE_CHECK_GL_ERROR(glDeleteFramebuffers(1, &tempFBO));
    }

	//--------------------------------------------------------------------------
    void Texture::_loadImages( const ConstImagePtrList& images )
    {
		if(images.size() < 1)
			OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Cannot load empty vector of images",
			 "Texture::loadImages");
        
		// Set desired texture size and properties from images[0]
		mSrcWidth = mWidth = images[0]->getWidth();
		mSrcHeight = mHeight = images[0]->getHeight();
		mSrcDepth = mDepth = images[0]->getDepth();

        // Get source image format and adjust if required
        mSrcFormat = images[0]->getFormat();
        if (mTreatLuminanceAsAlpha && mSrcFormat == PF_L8)
        {
            mSrcFormat = PF_A8;
        }

        if (mDesiredFormat != PF_UNKNOWN)
        {
            // If have desired format, use it
            mFormat = mDesiredFormat;
        }
        else
        {
            // Get the format according with desired bit depth
            mFormat = PixelUtil::getFormatForBitDepths(mSrcFormat, mDesiredIntegerBitDepth, mDesiredFloatBitDepth);
        }

		// The custom mipmaps in the image have priority over everything
        size_t imageMips = images[0]->getNumMipmaps();

		if(imageMips > 0) {
			mNumMipmaps = mNumRequestedMipmaps = images[0]->getNumMipmaps();
			// Disable flag for auto mip generation
			mUsage &= ~TU_AUTOMIPMAP;
		}
		
        // Create the texture
        createInternalResources();
		// Check if we're loading one image with multiple faces
		// or a vector of images representing the faces
		size_t faces;
		bool multiImage; // Load from multiple images?
		if(images.size() > 1)
		{
			faces = images.size();
			multiImage = true;
		}
		else
		{
			faces = images[0]->getNumFaces();
			multiImage = false;
		}
		
		// Check wether number of faces in images exceeds number of faces
		// in this texture. If so, clamp it.
		if(faces > getNumFaces())
			faces = getNumFaces();
		
        if (TextureManager::getSingleton().getVerbose()) {
            // Say what we're doing
            StringUtil::StrStreamType str;
            str << "Texture: " << mName << ": Loading " << faces << " faces"
                << "(" << PixelUtil::getFormatName(images[0]->getFormat()) << "," <<
                images[0]->getWidth() << "x" << images[0]->getHeight() << "x" << images[0]->getDepth() <<
                ") with ";
            if (!(mMipmapsHardwareGenerated && mNumMipmaps == 0))
                str << mNumMipmaps;
            if(mUsage & TU_AUTOMIPMAP)
            {
                if (mMipmapsHardwareGenerated)
                    str << " hardware";

                str << " generated mipmaps";
            }
            else
            {
                str << " custom mipmaps";
            }
            if(multiImage)
                str << " from multiple Images.";
            else
                str << " from Image.";
            // Scoped
            {
                // Print data about first destination surface
                HardwarePixelBufferSharedPtr buf = getBuffer(0, 0); 
                str << " Internal format is " << PixelUtil::getFormatName(buf->getFormat()) << 
                "," << buf->getWidth() << "x" << buf->getHeight() << "x" << buf->getDepth() << ".";
            }
            LogManager::getSingleton().logMessage( 
                    LML_NORMAL, str.str());
        }
		
		// Main loading loop
        // imageMips == 0 if the image has no custom mipmaps, otherwise contains the number of custom mips
        for(size_t mip = 0; mip<=imageMips; ++mip)
        {
//.........这里部分代码省略.........

    //-----------------------------------------------------------------------
    void ILUtil::fromOgre(const PixelBox &src)
    {
		// ilTexImage http://openil.sourceforge.net/docs/il/f00059.htm
		ILFormat ifmt = OgreFormat2ilFormat( src.format );
		if(src.isConsecutive() && ifmt.isValid()) 
		{
			// The easy case, the buffer is laid out in memory just like 
			// we want it to be and is in a format DevIL can understand directly
			// We could even save the copy if DevIL would let us
			ilTexImage(static_cast<ILuint>(src.getWidth()), 
				static_cast<ILuint>(src.getHeight()), 
				static_cast<ILuint>(src.getDepth()), ifmt.numberOfChannels,
				ifmt.format, ifmt.type, src.data);
		} 
		else if(ifmt.isValid()) 
		{
			// The format can be understood directly by DevIL. The only 
			// problem is that ilTexImage expects our image data consecutively 
			// so we cannot use that directly.
			
			// Let DevIL allocate the memory for us, and copy the data consecutively
			// to its memory
			ilTexImage(static_cast<ILuint>(src.getWidth()), 
				static_cast<ILuint>(src.getHeight()), 
				static_cast<ILuint>(src.getDepth()), ifmt.numberOfChannels,
				ifmt.format, ifmt.type, 0);
			PixelBox dst(src.getWidth(), src.getHeight(), src.getDepth(), src.format, ilGetData());
			PixelUtil::bulkPixelConversion(src, dst);
		} 
		else 
		{
			// Here it gets ugly. We're stuck with a pixel format that DevIL
			// can't do anything with. We will do a bulk pixel conversion and
			// then feed it to DevIL anyway. The problem is finding the best
			// format to convert to.
			
			// most general format supported by OGRE and DevIL
			PixelFormat fmt = PixelUtil::hasAlpha(src.format)?PF_FLOAT32_RGBA:PF_FLOAT32_RGB; 

			// Make up a pixel format
			// We don't have to consider luminance formats as they have
			// straight conversions to DevIL, just weird permutations of RGBA an LA
			int depths[4];
			PixelUtil::getBitDepths(src.format, depths);
			
			// Native endian format with all bit depths<8 can safely and quickly be 
			// converted to 24/32 bit
			if(PixelUtil::isNativeEndian(src.format) && 
				depths[0]<=8 && depths[1]<=8 && depths[2]<=8 && depths[3]<=8) {
				if(PixelUtil::hasAlpha(src.format)) {
					fmt = PF_A8R8G8B8;
				} else {
					fmt = PF_R8G8B8;
				}
			}
			
			// Let DevIL allocate the memory for us, then do the conversion ourselves
			ifmt = OgreFormat2ilFormat( fmt );
			ilTexImage(static_cast<ILuint>(src.getWidth()), 
				static_cast<ILuint>(src.getHeight()), 
				static_cast<ILuint>(src.getDepth()), ifmt.numberOfChannels,
				ifmt.format, ifmt.type, 0);
			PixelBox dst(src.getWidth(), src.getHeight(), src.getDepth(), fmt, ilGetData());
			PixelUtil::bulkPixelConversion(src, dst);
		}
    }