C++ ConstConfigRcPtr::getProcessor方法代码示例

void OCIOColorSpace::_validate(bool for_real)
{
    input0().validate(for_real);

    if(!m_hasColorSpaces)
    {
        error("No colorspaces available for input and/or output.");
        return;
    }

    int inputColorSpaceCount = static_cast<int>(m_inputColorSpaceCstrNames.size()) - 1;
    if(m_inputColorSpaceIndex < 0 || m_inputColorSpaceIndex >= inputColorSpaceCount)
    {
        std::ostringstream err;
        err << "Input colorspace index (" << m_inputColorSpaceIndex << ") out of range.";
        error(err.str().c_str());
        return;
    }

    int outputColorSpaceCount = static_cast<int>(m_outputColorSpaceCstrNames.size()) - 1;
    if(m_outputColorSpaceIndex < 0 || m_outputColorSpaceIndex >= outputColorSpaceCount)
    {
        std::ostringstream err;
        err << "Output colorspace index (" << m_outputColorSpaceIndex << ") out of range.";
        error(err.str().c_str());
        return;
    }

    try
    {
        const char * inputName = m_inputColorSpaceCstrNames[m_inputColorSpaceIndex];
        const char * outputName = m_outputColorSpaceCstrNames[m_outputColorSpaceIndex];
        
        OCIO::ConstConfigRcPtr config = OCIO::GetCurrentConfig();
        config->sanityCheck();
        
        OCIO::ConstContextRcPtr context = getLocalContext();
        m_processor = config->getProcessor(context, inputName, outputName);
    }
    catch(OCIO::Exception &e)
    {
        error(e.what());
        return;
    }
    
    if(m_processor->isNoOp())
    {
        // TODO or call disable() ?
        set_out_channels(DD::Image::Mask_None); // prevents engine() from being called
        copy_info();
        return;
    }
    
    set_out_channels(DD::Image::Mask_All);

    DD::Image::PixelIop::_validate(for_real);
}

void Generate(int cubesize, int maxwidth,
              const std::string & outputfile,
              const std::string & configfile,
              const std::string & incolorspace,
              const std::string & outcolorspace)
{
    int width = 0;
    int height = 0;
    int numchannels = 3;
    GetLutImageSize(width, height, cubesize, maxwidth);
    
    std::vector<float> img;
    img.resize(width*height*numchannels, 0);
    
    GenerateIdentityLut3D(&img[0], cubesize, numchannels, LUT3DORDER_FAST_RED);
    
    if(!incolorspace.empty() || !outcolorspace.empty())
    {
        OCIO::ConstConfigRcPtr config = OCIO::Config::Create();
        if(!configfile.empty())
        {
            config = OCIO::Config::CreateFromFile(configfile.c_str());
        }
        else if(getenv("OCIO"))
        {
            config = OCIO::Config::CreateFromEnv();
        }
        else
        {
            std::ostringstream os;
            os << "You must specify an ocio configuration ";
            os << "(either with --config or $OCIO).";
            throw Exception(os.str().c_str());
        }
        
        OCIO::ConstProcessorRcPtr processor = 
            config->getProcessor(incolorspace.c_str(), outcolorspace.c_str());
       
        OCIO::PackedImageDesc imgdesc(&img[0], width, height, 3);
        processor->apply(imgdesc);
    }

    OIIO::ImageOutput* f = OIIO::ImageOutput::create(outputfile);
    if(!f)
    {
        throw Exception( "Could not create output image.");
    }
    
    OIIO::ImageSpec spec(width, height, numchannels, OIIO::TypeDesc::TypeFloat);
    
    // TODO: If DPX, force 16-bit output?
    f->open(outputfile, spec);
    f->write_image(OIIO::TypeDesc::FLOAT, &img[0]);
    f->close();
    delete f;
}

void OCIOFileTransform::_validate(bool for_real)
{
    input0().validate(for_real);
    
    if(!src)
    {
        error("The source file must be specified.");
        return;
    }
    
    try
    {
        OCIO::ConstConfigRcPtr config = OCIO::GetCurrentConfig();
        config->sanityCheck();
        
        OCIO::FileTransformRcPtr transform = OCIO::FileTransform::Create();
        transform->setSrc(src);
        
        // TODO: For some reason, cccid is NOT incorporated in this node's hash.
        // Until then, cccid is considered broken. Figure out why.
        transform->setCCCId(cccid.c_str());
        
        if(dirindex == 0) transform->setDirection(OCIO::TRANSFORM_DIR_FORWARD);
        else transform->setDirection(OCIO::TRANSFORM_DIR_INVERSE);
        
        if(interpindex == 0) transform->setInterpolation(OCIO::INTERP_NEAREST);
        else transform->setInterpolation(OCIO::INTERP_LINEAR);
        
        processor = config->getProcessor(transform, OCIO::TRANSFORM_DIR_FORWARD);
    }
    catch(OCIO::Exception &e)
    {
        error(e.what());
        return;
    }
    
    if(processor->isNoOp())
    {
        // TODO or call disable() ?
        set_out_channels(DD::Image::Mask_None); // prevents engine() from being called
        copy_info();
        return;
    }
    
    set_out_channels(DD::Image::Mask_All);

    DD::Image::PixelIop::_validate(for_real);
}

void OCIOFileTransform::_validate(bool for_real)
{
    if(!m_file)
    {
        error("The source file must be specified.");
        return;
    }
    
    try
    {
        OCIO::ConstConfigRcPtr config = OCIO::GetCurrentConfig();
        
        OCIO::FileTransformRcPtr transform = OCIO::FileTransform::Create();
        transform->setSrc(m_file);
        
        transform->setCCCId(m_cccid.c_str());
        
        if(m_dirindex == 0) transform->setDirection(OCIO::TRANSFORM_DIR_FORWARD);
        else transform->setDirection(OCIO::TRANSFORM_DIR_INVERSE);
        
        if(m_interpindex == 0) transform->setInterpolation(OCIO::INTERP_NEAREST);
        else if(m_interpindex == 1) transform->setInterpolation(OCIO::INTERP_LINEAR);
        else if(m_interpindex == 2) transform->setInterpolation(OCIO::INTERP_TETRAHEDRAL);
        else if(m_interpindex == 3) transform->setInterpolation(OCIO::INTERP_BEST);
        else
        {
            // Should never happen
            error("Interpolation value out of bounds");
            return;
        }
        
        m_processor = config->getProcessor(transform, OCIO::TRANSFORM_DIR_FORWARD);
    }
    catch(OCIO::Exception &e)
    {
        error(e.what());
        return;
    }
    
    if(m_processor->isNoOp())
    {
        set_out_channels(DD::Image::Mask_None); // prevents engine() from being called
    } else {    
        set_out_channels(DD::Image::Mask_All);
    }

    DD::Image::PixelIop::_validate(for_real);
}

void OCIOCDLTransform::_validate(bool for_real)
{
    input0().validate(for_real);
    
    try
    {
        OCIO::ConstConfigRcPtr config = OCIO::GetCurrentConfig();
        config->sanityCheck();

        OCIO::CDLTransformRcPtr cc = OCIO::CDLTransform::Create();
        cc->setSlope(m_slope);
        cc->setOffset(m_offset);
        cc->setPower(m_power);
        cc->setSat(m_saturation);

        if(m_dirindex == 0) cc->setDirection(OCIO::TRANSFORM_DIR_FORWARD);
        else cc->setDirection(OCIO::TRANSFORM_DIR_INVERSE);

        m_processor = config->getProcessor(cc);
    }
    catch(OCIO::Exception &e)
    {
        error(e.what());
        return;
    }
    
    if(m_processor->isNoOp())
    {
        // TODO or call disable() ?
        set_out_channels(DD::Image::Mask_None); // prevents engine() from being called
        copy_info();
        return;
    }
    
    set_out_channels(DD::Image::Mask_All);

    DD::Image::PixelIop::_validate(for_real);
}

ColorSpaceProcessor *ColorSpaceManager::get_processor(ustring colorspace)
{
#ifdef WITH_OCIO
  /* Only use this for OpenColorIO color spaces, not the builtin ones. */
  assert(colorspace != u_colorspace_srgb && colorspace != u_colorspace_auto);

  if (colorspace == u_colorspace_raw) {
    return NULL;
  }

  OCIO::ConstConfigRcPtr config = OCIO::GetCurrentConfig();
  if (!config) {
    return NULL;
  }

  /* Cache processor until free_memory(), memory overhead is expected to be
   * small and the processor is likely to be reused. */
  thread_scoped_lock cache_processors_lock(cache_processors_mutex);
  if (cached_processors.find(colorspace) == cached_processors.end()) {
    try {
      cached_processors[colorspace] = config->getProcessor(colorspace.c_str(), "scene_linear");
    }
    catch (OCIO::Exception &exception) {
      cached_processors[colorspace] = OCIO::ConstProcessorRcPtr();
      VLOG(1) << "Colorspace " << colorspace.c_str()
              << " can't be converted to scene_linear: " << exception.what();
    }
  }

  const OCIO::Processor *processor = cached_processors[colorspace].get();
  return (ColorSpaceProcessor *)processor;
#else
  /* No OpenColorIO. */
  (void)colorspace;
  return NULL;
#endif
}

void OCIOLogConvert::_validate(bool for_real)
{
    try
    {
        OCIO::ConstConfigRcPtr config = OCIO::GetCurrentConfig();
        
        const char * src = 0;
        const char * dst = 0;
        
        if(modeindex == 0)
        {
            src = OCIO::ROLE_COMPOSITING_LOG;
            dst = OCIO::ROLE_SCENE_LINEAR;
        }
        else
        {
            src = OCIO::ROLE_SCENE_LINEAR;
            dst = OCIO::ROLE_COMPOSITING_LOG;
        }
        
        processor = config->getProcessor(src, dst);
    }
    catch(OCIO::Exception &e)
    {
        error(e.what());
        return;
    }
    
    if(processor->isNoOp())
    {
        set_out_channels(DD::Image::Mask_None); // prevents engine() from being called
    } else {    
        set_out_channels(DD::Image::Mask_All);
    }

    DD::Image::PixelIop::_validate(for_real);
}

int main(int argc, char **argv)
{
    if(argc<5)
    {
        std::cerr << USAGE_TEXT << std::endl;
        exit(0);
    }

    const char * inputimage = argv[1];
    const char * inputcolorspace = argv[2];
    const char * outputimage = argv[3];
    const char * outputcolorspace = argv[4];

    OIIO::ImageSpec spec;
    std::vector<float> img;
    int imgwidth = 0;
    int imgheight = 0;
    int components = 0;

    // Load the image
    std::cerr << "Loading " << inputimage << std::endl;
    try
    {
        OIIO::ImageInput* f = OIIO::ImageInput::create(inputimage);
        if(!f)
        {
            std::cerr << "Could not create image input." << std::endl;
            exit(1);
        }

        f->open(inputimage, spec);

        std::string error = f->geterror();
        if(!error.empty())
        {
            std::cerr << "Error loading image " << error << std::endl;
            exit(1);
        }

        imgwidth = spec.width;
        imgheight = spec.height;
        components = spec.nchannels;

        img.resize(imgwidth*imgheight*components);
        memset(&img[0], 0, imgwidth*imgheight*components*sizeof(float));

        f->read_image(OIIO::TypeDesc::TypeFloat, &img[0]);
        delete f;

    }
    catch(...)
    {
        std::cerr << "Error loading file.";
        exit(1);
    }

    // Process the image
    try
    {
        // Load the current config.
        OCIO::ConstConfigRcPtr config = OCIO::GetCurrentConfig();

        // Get the processor
        OCIO::ConstProcessorRcPtr processor = config->getProcessor(inputcolorspace, outputcolorspace);

        // Wrap the image in a light-weight ImageDescription
        OCIO::PackedImageDesc imageDesc(&img[0], imgwidth, imgheight, components);

        // Apply the color transformation (in place)
        processor->apply(imageDesc);
    }
    catch(OCIO::Exception & exception)
    {
        std::cerr << "OCIO Error: " << exception.what() << std::endl;
    }
    catch(...)
    {
        std::cerr << "Unknown OCIO error encountered." << std::endl;
    }

    // Write out the result
    try
    {
        OIIO::ImageOutput* f = OIIO::ImageOutput::create(outputimage);
        if(!f)
        {
            std::cerr << "Could not create output input." << std::endl;
            exit(1);
        }

        f->open(outputimage, spec);
        f->write_image(OIIO::TypeDesc::FLOAT, &img[0]);
        f->close();
        delete f;
    }
    catch(...)
    {
        std::cerr << "Error loading file.";
        exit(1);
    }
//.........这里部分代码省略.........

void
OCIOProcessor::setValues(const OCIO_NAMESPACE::ConstConfigRcPtr &config, const OCIO_NAMESPACE::ConstContextRcPtr &context, const OCIO_NAMESPACE::ConstTransformRcPtr& transform, OCIO_NAMESPACE::TransformDirection direction)
{
    _proc = config->getProcessor(context, transform, direction);
}

//.........这里部分代码省略.........
                    std::cout << cs->getName() << " (" << role << ": user)" << std::endl;
                }
                else
                {
                    std::cout << "ERROR: NOT DEFINED" << " (" << role << ")" << std::endl;
                    errorcount += 1;
                }
                
            }
        }
        
        std::cout << std::endl;
        std::cout << "** ColorSpaces **" << std::endl;
        OCIO::ConstColorSpaceRcPtr lin = config->getColorSpace(OCIO::ROLE_SCENE_LINEAR);
        if(!lin)
        {
            std::cout << "Error: scene_linear role must be defined." << std::endl;
            errorcount += 1;
        }
        else
        {
            for(int i=0; i<config->getNumColorSpaces(); ++i)
            {
                OCIO::ConstColorSpaceRcPtr cs = config->getColorSpace(config->getColorSpaceNameByIndex(i));
                
                bool convertsToLinear = true;
                std::string convertsToLinearErrorText;
                
                bool convertsFromLinear = true;
                std::string convertsFromLinearErrorText;
                
                try
                {
                    OCIO::ConstProcessorRcPtr p = config->getProcessor(cs, lin);
                }
                catch(OCIO::Exception & exception)
                {
                    convertsToLinear = false;
                    convertsToLinearErrorText = exception.what();
                }
                
                try
                {
                    OCIO::ConstProcessorRcPtr p = config->getProcessor(lin, cs);
                }
                catch(OCIO::Exception & exception)
                {
                    convertsFromLinear = false;
                    convertsFromLinearErrorText = exception.what();
                }
                
                if(convertsToLinear && convertsFromLinear)
                {
                    std::cout << cs->getName() << std::endl;
                }
                else if(!convertsToLinear && !convertsFromLinear)
                {
                    std::cout << cs->getName();
                    std::cout << " -- error" << std::endl;
                    std::cout << "\t" << convertsToLinearErrorText << std::endl;
                    std::cout << "\t" << convertsFromLinearErrorText << std::endl;
                    
                    errorcount += 1;
                }
                else if(convertsToLinear)
                {

void OCIOLookTransform::_validate(bool for_real)
{
    if(!m_hasColorSpaces)
    {
        error("No colorspaces available for input and/or output.");
        return;
    }

    int inputColorSpaceCount = static_cast<int>(m_inputColorSpaceCstrNames.size()) - 1;
    if(m_inputColorSpaceIndex < 0 || m_inputColorSpaceIndex >= inputColorSpaceCount)
    {
        std::ostringstream err;
        err << "Input colorspace index (" << m_inputColorSpaceIndex << ") out of range.";
        error(err.str().c_str());
        return;
    }

    int outputColorSpaceCount = static_cast<int>(m_outputColorSpaceCstrNames.size()) - 1;
    if(m_outputColorSpaceIndex < 0 || m_outputColorSpaceIndex >= outputColorSpaceCount)
    {
        std::ostringstream err;
        err << "Output colorspace index (" << m_outputColorSpaceIndex << ") out of range.";
        error(err.str().c_str());
        return;
    }

    try
    {
        OCIO::ConstConfigRcPtr config = OCIO::GetCurrentConfig();
        
        const char * inputName = config->getColorSpaceNameByIndex(m_inputColorSpaceIndex);
        const char * outputName = config->getColorSpaceNameByIndex(m_outputColorSpaceIndex);
        
        OCIO::LookTransformRcPtr transform = OCIO::LookTransform::Create();
        const char * look = m_lookCstrNames[m_lookIndex];
        if(look != NULL)
        {
            transform->setLooks(look);
        }
        
        OCIO::ConstContextRcPtr context = getLocalContext();
        OCIO::TransformDirection direction = OCIO::TRANSFORM_DIR_UNKNOWN;
        bool invertTransform = (m_dirIndex == 0) ? false : true;
        
        // Forward
        if(!invertTransform)
        {
            transform->setSrc(inputName);
            transform->setDst(outputName);
            direction = OCIO::TRANSFORM_DIR_FORWARD;
        }
        else
        {
            // The TRANSFORM_DIR_INVERSE applies an inverse for the end-to-end transform,
            // which would otherwise do dst->inv look -> src.
            // This is an unintuitive result for the artist (who would expect in, out to
            // remain unchanged), so we account for that here by flipping src/dst
            
            transform->setSrc(outputName);
            transform->setDst(inputName);
            direction = OCIO::TRANSFORM_DIR_INVERSE;
        }
        
        try
        {
            m_processor = config->getProcessor(context, transform, direction);
        }
        // We only catch the exceptions for missing files, and try to succeed
        // in this case. All other errors represent more serious problems and
        // should fail through.
        catch(const OCIO::ExceptionMissingFile &e)
        {
            if(!m_ignoreErrors) throw;
            m_processor = config->getProcessor(context, inputName, outputName);
        }
    }
    catch(const OCIO::Exception &e)
    {
        error(e.what());
        return;
    }
    catch (...)
    {
        error("OCIOLookTransform: Unknown exception during _validate.");
        return;
    }
    
    if(m_processor->isNoOp())
    {
        set_out_channels(DD::Image::Mask_None); // prevents engine() from being called
    } else {    
        set_out_channels(DD::Image::Mask_All);
    }

    DD::Image::PixelIop::_validate(for_real);
}

void UpdateOCIOGLState()
{
    // Step 0: Get the processor using any of the pipelines mentioned above.
    OCIO::ConstConfigRcPtr config = OCIO::GetCurrentConfig();

    OCIO::DisplayTransformRcPtr transform = OCIO::DisplayTransform::Create();
    transform->setInputColorSpaceName( g_inputColorSpace.c_str() );
    transform->setDisplay( g_display.c_str() );
    transform->setView( g_transformName.c_str() );

    // Add optional transforms to create a full-featured, "canonical" display pipeline
    // Fstop exposure control (in SCENE_LINEAR)
    {
        float gain = powf(2.0f, g_exposure_fstop);
        const float slope4f[] = { gain, gain, gain, gain };
        float m44[16];
        float offset4[4];
        OCIO::MatrixTransform::Scale(m44, offset4, slope4f);
        OCIO::MatrixTransformRcPtr mtx =  OCIO::MatrixTransform::Create();
        mtx->setValue(m44, offset4);
        transform->setLinearCC(mtx);
    }

    // Channel swizzling
    {
        float lumacoef[3];
        config->getDefaultLumaCoefs(lumacoef);
        float m44[16];
        float offset[4];
        OCIO::MatrixTransform::View(m44, offset, g_channelHot, lumacoef);
        OCIO::MatrixTransformRcPtr swizzle = OCIO::MatrixTransform::Create();
        swizzle->setValue(m44, offset);
        transform->setChannelView(swizzle);
    }

    // Post-display transform gamma
    {
        float exponent = 1.0f/std::max(1e-6f, static_cast<float>(g_display_gamma));
        const float exponent4f[] = { exponent, exponent, exponent, exponent };
        OCIO::ExponentTransformRcPtr expTransform =  OCIO::ExponentTransform::Create();
        expTransform->setValue(exponent4f);
        transform->setDisplayCC(expTransform);
    }

    OCIO::ConstProcessorRcPtr processor;
    try
    {
        processor = config->getProcessor(transform);
    }
    catch(OCIO::Exception & e)
    {
        std::cerr << e.what() << std::endl;
        return;
    }
    catch(...)
    {
        return;
    }

    // Step 1: Create a GPU Shader Description
    OCIO::GpuShaderDesc shaderDesc;
    shaderDesc.setLanguage(OCIO::GPU_LANGUAGE_GLSL_1_0);
    shaderDesc.setFunctionName("OCIODisplay");
    shaderDesc.setLut3DEdgeLen(LUT3D_EDGE_SIZE);

    // Step 2: Compute the 3D LUT
    std::string lut3dCacheID = processor->getGpuLut3DCacheID(shaderDesc);
    if(lut3dCacheID != g_lut3dcacheid)
    {
        //std::cerr << "Computing 3DLut " << g_lut3dcacheid << std::endl;

        g_lut3dcacheid = lut3dCacheID;
        processor->getGpuLut3D(&g_lut3d[0], shaderDesc);

        glBindTexture(GL_TEXTURE_3D, g_lut3dTexID);
        glTexSubImage3D(GL_TEXTURE_3D, 0,
                        0, 0, 0,
                        LUT3D_EDGE_SIZE, LUT3D_EDGE_SIZE, LUT3D_EDGE_SIZE,
                        GL_RGB,GL_FLOAT, &g_lut3d[0]);
    }

    // Step 3: Compute the Shader
    std::string shaderCacheID = processor->getGpuShaderTextCacheID(shaderDesc);
    if(g_program == 0 || shaderCacheID != g_shadercacheid)
    {
        //std::cerr << "Computing Shader " << g_shadercacheid << std::endl;

        g_shadercacheid = shaderCacheID;

        std::ostringstream os;
        os << processor->getGpuShaderText(shaderDesc) << "\n";
        os << g_fragShaderText;
        //std::cerr << os.str() << std::endl;

        if(g_fragShader) glDeleteShader(g_fragShader);
        g_fragShader = CompileShaderText(GL_FRAGMENT_SHADER, os.str().c_str());
        if(g_program) glDeleteProgram(g_program);
        g_program = LinkShaders(g_fragShader);
    }

//.........这里部分代码省略.........

std::string
HdxColorCorrectionTask::_CreateOpenColorIOResources()
{
    #ifdef PXR_OCIO_PLUGIN_ENABLED
        // Use client provided OCIO values, or use default fallback values
        OCIO::ConstConfigRcPtr config = OCIO::GetCurrentConfig();

        const char* display = _displayOCIO.empty() ? 
                              config->getDefaultDisplay() : 
                              _displayOCIO.c_str();

        const char* view = _viewOCIO.empty() ? 
                           config->getDefaultView(display) :
                           _viewOCIO.c_str();

        std::string inputColorSpace = _colorspaceOCIO;
        if (inputColorSpace.empty()) {
            OCIO::ConstColorSpaceRcPtr cs = config->getColorSpace("default");
            if (cs) {
                inputColorSpace = cs->getName();
            } else {
                inputColorSpace = OCIO::ROLE_SCENE_LINEAR;
            }
        }

        // Setup the transformation we need to apply
        OCIO::DisplayTransformRcPtr transform = OCIO::DisplayTransform::Create();
        transform->setDisplay(display);
        transform->setView(view);
        transform->setInputColorSpaceName(inputColorSpace.c_str());
        if (!_looksOCIO.empty()) {
            transform->setLooksOverride(_looksOCIO.c_str());
            transform->setLooksOverrideEnabled(true);
        } else {
            transform->setLooksOverrideEnabled(false);
        }

        OCIO::ConstProcessorRcPtr processor = config->getProcessor(transform);

        // Create a GPU Shader Description
        OCIO::GpuShaderDesc shaderDesc;
        shaderDesc.setLanguage(OCIO::GPU_LANGUAGE_GLSL_1_0);
        shaderDesc.setFunctionName("OCIODisplay");
        shaderDesc.setLut3DEdgeLen(_lut3dSizeOCIO);

        // Compute and the 3D LUT
        int num3Dentries = 3 * _lut3dSizeOCIO*_lut3dSizeOCIO*_lut3dSizeOCIO;
        std::vector<float> lut3d;
        lut3d.resize(num3Dentries);
        processor->getGpuLut3D(&lut3d[0], shaderDesc);

        // Load the data into an OpenGL 3D Texture
        if (_texture3dLUT != 0) {
            glDeleteTextures(1, &_texture3dLUT);
        }
        GLint restoreTexture;
        glGetIntegerv(GL_TEXTURE_BINDING_3D, &restoreTexture);
        glGenTextures(1, &_texture3dLUT);
        glBindTexture(GL_TEXTURE_3D, _texture3dLUT);
        glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
        glTexImage3D(GL_TEXTURE_3D, 0, GL_RGB32F,
                     _lut3dSizeOCIO, _lut3dSizeOCIO, _lut3dSizeOCIO,
                     0, GL_RGB, GL_FLOAT, &lut3d[0]);
        glBindTexture(GL_TEXTURE_3D, restoreTexture);

        const char* gpuShaderText = processor->getGpuShaderText(shaderDesc);

        GLF_POST_PENDING_GL_ERRORS();
        return std::string(gpuShaderText);
    #else
        return std::string();
    #endif
}

void UpdateOCIOGLState()
{
    // Step 0: Get the processor using any of the pipelines mentioned above.
    OCIO::ConstConfigRcPtr config = OCIO::GetCurrentConfig();
    
    OCIO::DisplayTransformRcPtr transform = OCIO::DisplayTransform::Create();
    transform->setInputColorSpaceName( g_inputColorSpace.c_str() );
    transform->setDisplay( g_display.c_str() );
    transform->setView( g_transformName.c_str() );
    transform->setLooksOverride( g_look.c_str() );

    if(g_verbose)
    {
        std::cout << std::endl;
        std::cout << "Color transformation composed of:" << std::endl;
        std::cout << "      Image ColorSpace is:\t" << g_inputColorSpace << std::endl;
        std::cout << "      Transform is:\t\t" << g_transformName << std::endl;
        std::cout << "      Device is:\t\t" << g_display << std::endl;
        std::cout << "      Looks Override is:\t'" << g_look << "'" << std::endl;
        std::cout << "  with:" << std::endl;
        std::cout << "    exposure_fstop = " << g_exposure_fstop << std::endl;
        std::cout << "    display_gamma  = " << g_display_gamma << std::endl;
        std::cout << "    channels       = " 
                  << (g_channelHot[0] ? "R" : "")
                  << (g_channelHot[1] ? "G" : "")
                  << (g_channelHot[2] ? "B" : "")
                  << (g_channelHot[3] ? "A" : "") << std::endl;

    }
    
    // Add optional transforms to create a full-featured, "canonical" display pipeline
    // Fstop exposure control (in SCENE_LINEAR)
    {
        float gain = powf(2.0f, g_exposure_fstop);
        const float slope4f[] = { gain, gain, gain, gain };
        float m44[16];
        float offset4[4];
        OCIO::MatrixTransform::Scale(m44, offset4, slope4f);
        OCIO::MatrixTransformRcPtr mtx =  OCIO::MatrixTransform::Create();
        mtx->setValue(m44, offset4);
        transform->setLinearCC(mtx);
    }
    
    // Channel swizzling
    {
        float lumacoef[3];
        config->getDefaultLumaCoefs(lumacoef);
        float m44[16];
        float offset[4];
        OCIO::MatrixTransform::View(m44, offset, g_channelHot, lumacoef);
        OCIO::MatrixTransformRcPtr swizzle = OCIO::MatrixTransform::Create();
        swizzle->setValue(m44, offset);
        transform->setChannelView(swizzle);
    }
    
    // Post-display transform gamma
    {
        float exponent = 1.0f/std::max(1e-6f, static_cast<float>(g_display_gamma));
        const float exponent4f[] = { exponent, exponent, exponent, exponent };
        OCIO::ExponentTransformRcPtr expTransform =  OCIO::ExponentTransform::Create();
        expTransform->setValue(exponent4f);
        transform->setDisplayCC(expTransform);
    }
    
    OCIO::ConstProcessorRcPtr processor;
    try
    {
        processor = config->getProcessor(transform);
    }
    catch(OCIO::Exception & e)
    {
        std::cerr << e.what() << std::endl;
        return;
    }
    catch(...)
    {
        return;
    }
    
    // Step 1: Create the appropriate GPU shader description
    OCIO::GpuShaderDescRcPtr shaderDesc 
        = g_gpulegacy ? OCIO::GpuShaderDesc::CreateLegacyShaderDesc(LUT3D_EDGE_SIZE)
                      : OCIO::GpuShaderDesc::CreateShaderDesc();
    shaderDesc->setLanguage(OCIO::GPU_LANGUAGE_GLSL_1_0);
    shaderDesc->setFunctionName("OCIODisplay");
    shaderDesc->setResourcePrefix("ocio_");

    // Step 2: Collect the shader program information for a specific processor    
    processor->extractGpuShaderInfo(shaderDesc);

    // Step 3: Use the helper OpenGL builder
    g_oglBuilder = OpenGLBuilder::Create(shaderDesc);
    g_oglBuilder->setVerbose(g_gpuinfo);

    // Step 4: Allocate & upload all the LUTs
    // 
    // NB: The start index for the texture indices is 1 as one texture
    //     was already created for the input image.
    //     
    g_oglBuilder->allocateAllTextures(1);
//.........这里部分代码省略.........