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

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.........

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.........