ColorProcessor*
ColorConfig::createDisplayTransform (string_view display,
string_view view,
string_view inputColorSpace,
string_view looks,
string_view context_key,
string_view context_value) const
{
#ifdef USE_OCIO
// Ask OCIO to make a Processor that can handle the requested
// transformation.
if (getImpl()->config_) {
OCIO::ConstConfigRcPtr config = getImpl()->config_;
OCIO::DisplayTransformRcPtr transform = OCIO::DisplayTransform::Create();
transform->setInputColorSpaceName (inputColorSpace.c_str());
transform->setDisplay(display.c_str());
transform->setView(view.c_str());
if (looks.size()) {
transform->setLooksOverride(looks.c_str());
transform->setLooksOverrideEnabled(true);
} else {
transform->setLooksOverrideEnabled(false);
}
OCIO::ConstContextRcPtr context = config->getCurrentContext();
std::vector<string_view> keys, values;
Strutil::split (context_key, keys, ",");
Strutil::split (context_value, values, ",");
if (keys.size() && values.size() && keys.size() == values.size()) {
OCIO::ContextRcPtr ctx = context->createEditableCopy();
for (size_t i = 0; i < keys.size(); ++i)
ctx->setStringVar (keys[i].c_str(), values[i].c_str());
context = ctx;
}
OCIO::ConstProcessorRcPtr p;
try {
// Get the processor corresponding to this transform.
p = getImpl()->config_->getProcessor (context, transform,
OCIO::TRANSFORM_DIR_FORWARD);
}
catch(OCIO::Exception &e) {
getImpl()->error_ = e.what();
return NULL;
}
catch(...) {
getImpl()->error_ = "An unknown error occurred in OpenColorIO, getProcessor";
return NULL;
}
getImpl()->error_ = "";
return new ColorProcessor_OCIO(p);
}
#endif
return NULL; // if we get this far, we've failed
}
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);
// Step 5: Build the fragment shader program
g_oglBuilder->buildProgram(g_fragShaderText);
// Step 6: Enable the fragment shader program, and all needed textures
g_oglBuilder->useProgram();
// The image texture
glUniform1i(glGetUniformLocation(g_oglBuilder->getProgramHandle(), "tex1"), 0);
// The LUT textures
g_oglBuilder->useAllTextures();
}