VuoShaderFile.cc

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#include "VuoShaderFile.hh"
 
#include <regex.h>
#include <sstream>
#include "VuoCompositionMetadata.hh"
#include "VuoException.hh"
#include "VuoJsonUtilities.hh"
#include "VuoStringUtilities.hh"
#include "VuoShaderIssues.hh"
 
VuoShaderFile::VuoShaderFile(Type type)
{
    init(getTemplate(type));
}
 
VuoFileUtilities::File VuoShaderFile::getTemplate(VuoShaderFile::Type type)
{
    string path = VuoFileUtilities::getVuoFrameworkPath() + "/Resources";
 
    string filename;
    if (type == GLSLImageFilter)
        filename = "GLSLImageFilter.fs";
    else if (type == GLSLImageGenerator)
        filename = "GLSLImageGenerator.fs";
    else if (type == GLSLImageTransition)
        filename = "GLSLImageTransition.fs";
    else if (type == GLSLObjectRenderer)
        filename = "GLSLObjectRenderer.fs";
    else // if (type == GLSLObjectFilter)
        filename = "GLSLObjectFilter.vs";
 
    return VuoFileUtilities::File(path, filename);
}
 
string VuoShaderFile::stageName(VuoShaderFile::Stage stage)
{
    if (stage == Vertex)
        return "Vertex";
    else if (stage == Geometry)
        return "Geometry";
    else if (stage == Fragment)
        return "Fragment";
    else // if (stage == Program)
        return "Program";
}
 
VuoShaderFile::VuoShaderFile(VuoFileUtilities::File file, const string &overriddenFragmentSource)
{
    basename = file.basename();
    extension = file.extension();
    init(file, overriddenFragmentSource);
}
 
void VuoShaderFile::init(VuoFileUtilities::File file, const string &overriddenFragmentSource)
{
    _showsTime = false;
 
    json_object *isfMetadata = NULL;
 
    splitMetadataAndSource(readStage(file.fileWithDifferentExtension("vs")), &isfMetadata, _vertexSource);
    splitMetadataAndSource(readStage(file.fileWithDifferentExtension("gs")), &isfMetadata, _geometrySource);
    splitMetadataAndSource(! overriddenFragmentSource.empty() ? overriddenFragmentSource : readStage(file.fileWithDifferentExtension("fs")), &isfMetadata, _fragmentSource);
 
    parseMetadata(isfMetadata);
}
 
void VuoShaderFile::dump()
{
    VUserLog("\"%s\"", _name.c_str());
    VUserLog("    type: %s", typeName().c_str());
    VUserLog("    isfVersion: %s", isfVersion.c_str());
    VUserLog("    shaderVersion: %s", shaderVersion.c_str());
    VUserLog("    copyright: %s",copyright.c_str());
    VUserLog("    license: %s",license.c_str());
    VUserLog("    description: %s",description.c_str());
    VUserLog("    homepageLink: %s", homepageLink.c_str());
    VUserLog("    documentationLink: %s", documentationLink.c_str());
    VUserLog("    categories:");
    for (vector<string>::iterator i = categories.begin(); i != categories.end(); ++i)
        VUserLog("        %s", i->c_str());
    VUserLog("    keywords:");
    for (vector<string>::iterator i = keywords.begin(); i != keywords.end(); ++i)
        VUserLog("        %s", i->c_str());
    VUserLog("    inputs:");
    for (vector<Port>::iterator i = _inputPorts.begin(); i != _inputPorts.end(); ++i)
        VUserLog("        %s %s %s", i->vuoTypeName.c_str(), i->key.c_str(), json_object_to_json_string(i->vuoPortDetails));
    VUserLog("    showsTime       : %d", _showsTime);
    VUserLog("    outputKey : %s", outputKey.c_str());
    VUserLog("    outputName: %s", outputName.c_str());
    VUserLog("VS [%s]",_vertexSource.c_str());
    VUserLog("GS [%s]",_geometrySource.c_str());
    VUserLog("FS [%s]",_fragmentSource.c_str());
    VUserLog("VuoModuleMetadata %s",json_object_to_json_string(vuoModuleMetadata()));
}
 
string VuoShaderFile::name()
{
    return _name;
}
 
VuoShaderFile::Type VuoShaderFile::type()
{
    return _type;
}
 
string VuoShaderFile::typeName()
{
    if (_type == VuoShaderFile::GLSLImageFilter)
        return "Image Filter";
    else if (_type == VuoShaderFile::GLSLImageGenerator)
        return "Image Generator";
    else if (_type == VuoShaderFile::GLSLImageTransition)
        return "Image Transition";
    else if (_type == VuoShaderFile::GLSLObjectRenderer)
        return "3D Object Renderer";
    else
        return "3D Object Filter";
}
 
string VuoShaderFile::typeNameISF()
{
    if (_type == VuoShaderFile::GLSLImageFilter
     || _type == VuoShaderFile::GLSLImageGenerator
     || _type == VuoShaderFile::GLSLImageTransition)
        return "IMAGE";
    else if (_type == VuoShaderFile::GLSLObjectRenderer)
        return "OBJECT_RENDER";
    else
        return "OBJECT_FILTER";
}
 
bool VuoShaderFile::typeAllowsGeometryShader()
{
    return _type == VuoShaderFile::GLSLObjectRenderer
        || _type == VuoShaderFile::GLSLObjectFilter;
}
 
bool VuoShaderFile::typeAllowsFragmentShader()
{
    return _type == VuoShaderFile::GLSLImageFilter
        || _type == VuoShaderFile::GLSLImageGenerator
        || _type == VuoShaderFile::GLSLImageTransition
        || _type == VuoShaderFile::GLSLObjectRenderer;
}
 
VuoCompositionMetadata *VuoShaderFile::metadata()
{
    VuoCompositionMetadata *metadata = new VuoCompositionMetadata();
    metadata->setDefaultName("VuoShader");
    metadata->setName(_name);
    metadata->setVersion(shaderVersion);
    metadata->setCopyright(copyright);
    metadata->setLicense(license);
    metadata->setDescription(description);
    metadata->setHomepageURL(homepageLink);
    metadata->setDocumentationURL(documentationLink);
    metadata->setKeywords(keywords);
    metadata->setCategories(categories);
    return metadata;
}
 
void VuoShaderFile::setMetadata(VuoCompositionMetadata *metadata)
{
    string customizedName = metadata->getCustomizedName();
    if (! customizedName.empty())
        _name = customizedName;
 
    shaderVersion = metadata->getVersion();
    copyright = metadata->getCopyright();
    license = metadata->getLicense();
    description = metadata->getDescription();
    homepageLink = metadata->getHomepageURL();
    documentationLink = metadata->getDocumentationURL();
    keywords = metadata->getKeywords();
    categories = metadata->getCategories();
}
 
json_object *VuoShaderFile::vuoModuleMetadata()
{
    return _vuoModuleMetadata;
}
 
void VuoShaderFile::setVuoModuleMetadata(json_object *metadata)
{
    _vuoModuleMetadata = metadata;
}
 
vector<VuoShaderFile::Port> VuoShaderFile::inputPorts()
{
    return _inputPorts;
}
 
void VuoShaderFile::setInputPorts(vector<VuoShaderFile::Port> ports)
{
    _inputPorts = ports;
}
 
bool VuoShaderFile::showsTime()
{
    return _showsTime;
}
 
VuoShaderFile::Port VuoShaderFile::outputPort()
{
    json_object *vuoPortDetails = json_object_new_object();
    json_object_object_add(vuoPortDetails, "name", json_object_new_string(outputName.c_str()));
    return (Port){outputKey, "", vuoPortDetails};
}
 
string &VuoShaderFile::vertexSource()
{
    return _vertexSource;
}
 
void VuoShaderFile::setVertexSource(const string &source)
{
    _vertexSource = source;
}
 
void VuoShaderFile::insertPreamble(ostringstream &oss, bool isFragment)
{
    oss << "#version 120\n"
 
        // Ensure errors in the preamble don't overlap with errors in user-entered code.
        << "#line " << VuoShaderIssues::PreambleLine << "\n"
 
           "\n"
           "// Standard ISF variables\n"
 
           "varying vec2 isf_FragNormCoord;\n"
//         "varying vec3 isf_VertNorm;\n"
//         "varying vec3 isf_VertPos;\n"
 
           "uniform int PASSINDEX;\n"
 
//         "uniform vec2 RENDERSIZE;\n"
           "uniform vec2 viewportSize;\n"
           "#define RENDERSIZE viewportSize\n"
 
           "uniform float TIME;\n"
           "uniform float TIMEDELTA;\n"
           "uniform vec4 DATE;\n"
           "uniform int FRAMEINDEX;\n"
 
           // ISF v1
           "#define vv_FragNormCoord isf_FragNormCoord\n"
           "#define vv_vertShaderInit isf_vertShaderInit\n";
 
    oss << "\n"
           "// Input ports\n";
    for (vector<Port>::iterator it = _inputPorts.begin(); it != _inputPorts.end(); ++it)
        oss << glslDeclarationForPort(*it);
 
    if (isFragment)
        oss << "\n"
               "#include \"ISFGLMacro2D.txt\"\n"
//             "#include \"ISFGLMacro2DBias.txt\"\n"
               "#include \"ISFGLMacro2DRect.txt\"\n"
//             "#include \"ISFGLMacro2DRectBias.txt\"\n"
               "\n";
}
 
 
string VuoShaderFile::expandedVertexSource()
{
    ostringstream oss;
 
    insertPreamble(oss, false);
 
    oss << "#include \"ISFGLSceneVertShaderIncludeVarDec.txt\"\n"
        << "void isf_vertShaderInit(void)\n"
        << "{\n"
            << "\t#include \"ISFGLSceneVertShaderIncludeInitFunc.txt\"\n"
            // @@@ set _texCoord + _normTexCoord
        << "}\n";
 
    if (_vertexSource.empty())
        oss << "#include \"ISFGLScenePassthru.vs\"";
    else
        oss << "#line 0\n"
            << _vertexSource;
 
    return oss.str();
}
 
string &VuoShaderFile::geometrySource()
{
    return _geometrySource;
}
 
void VuoShaderFile::setGeometrySource(const string &source)
{
    _geometrySource = source;
}
 
string VuoShaderFile::expandedGeometrySource()
{
    if (_geometrySource.empty())
        return "";
 
    ostringstream oss;
 
    insertPreamble(oss, false);
 
    oss << "#line 0\n"
        << _geometrySource;
 
    return oss.str();
}
 
string &VuoShaderFile::fragmentSource()
{
    return _fragmentSource;
}
 
void VuoShaderFile::setFragmentSource(const string &source)
{
    _fragmentSource = source;
}
 
string VuoShaderFile::expandedFragmentSource()
{
    if (_type == GLSLObjectFilter)
        return "";
 
    ostringstream oss;
 
    insertPreamble(oss, true);
 
    oss << "#line 0\n"
        << _fragmentSource;
 
    return oss.str();
}
 
void VuoShaderFile::save(string filePath)
{
    string basename = filePath.substr(0, filePath.find_last_of('.'));
 
    string vertexFile   = basename + ".vs";
    string geometryFile = basename + ".gs";
    string fragmentFile = basename + ".fs";
 
    if (_type == GLSLImageFilter
     || _type == GLSLImageGenerator
     || _type == GLSLImageTransition
     || _type == GLSLObjectRenderer)
    {
        saveStage(vertexFile, _vertexSource);
        saveStage(geometryFile, _geometrySource);
        saveStage(fragmentFile, _fragmentSource, _vuoModuleMetadata);
    }
    else // if (type == GLSLObjectFilter)
    {
        saveStage(vertexFile, _vertexSource, _vuoModuleMetadata);
        saveStage(geometryFile, _geometrySource);
        string empty = "";
        saveStage(fragmentFile, empty); // Delete stale file.
    }
}
 
string VuoShaderFile::fragmentFileContents()
{
    return stageFileContents(_fragmentSource, _vuoModuleMetadata);
}
 
string VuoShaderFile::readStage(VuoFileUtilities::File file)
{
    if (!file.exists())
        return "";
 
    return file.getContentsAsString();
}
 
void VuoShaderFile::splitMetadataAndSource(string inputString, json_object **outputMetadata, string &outputSourceString)
{
    regex_t metadataRegex;
    regcomp(&metadataRegex, "/\\*[\\s\r\n]*{.*}[\\s\r\n]*\\*/", REG_EXTENDED);
    size_t nmatch = 1;
    regmatch_t pmatch[nmatch];
    bool metadataFound = !regexec(&metadataRegex, inputString.c_str(), nmatch, pmatch, 0);
    regfree(&metadataRegex);
    if (metadataFound)
    {
        string metadataString = inputString.substr(pmatch[0].rm_so + 2, (pmatch[0].rm_eo - 1) - pmatch[0].rm_so - 3);
        outputSourceString = inputString.substr(0, pmatch[0].rm_so) + inputString.substr(pmatch[0].rm_eo);
 
        json_tokener_error error;
        *outputMetadata = json_tokener_parse_verbose(metadataString.c_str(), &error);
        if (!*outputMetadata)
        {
            VUserLog("Error: The metadata header isn't valid JSON: %s", json_tokener_error_desc(error));
            return;
        }
    }
    else
        outputSourceString = inputString;
 
    outputSourceString = VuoStringUtilities::trim(outputSourceString);
 
    // Check whether the `TIME` uniform is used.
    if (!_showsTime)
    {
        string::size_type len = outputSourceString.length();
        string::size_type pos = 0;
        while ( (pos = outputSourceString.find("TIME", pos)) != string::npos )
            if ( (pos > 1) && !isalnum(outputSourceString[pos - 1])
              && (pos + 4 < len) && !isalnum(outputSourceString[pos + 4]) )
            {
                _showsTime = true;
                break;
            }
            else
                pos += 4;
    }
}
 
void VuoShaderFile::parseMetadata(json_object *metadata)
{
    string normalizedBasename = basename;
    while (VuoStringUtilities::endsWith(normalizedBasename, "." + extension))
        normalizedBasename = normalizedBasename.substr(0, normalizedBasename.length() - extension.length() - 1);
 
    isfVersion        = VuoJsonUtilities::parseString(metadata, "ISFVSN", "1.0");
    string typeString = VuoJsonUtilities::parseString(metadata, "TYPE", "IMAGE");
    _name             = VuoJsonUtilities::parseString(metadata, "LABEL");
    shaderVersion     = VuoJsonUtilities::parseString(metadata, "VSN");
    copyright         = VuoJsonUtilities::parseString(metadata, "CREDIT");
    license           = VuoJsonUtilities::parseString(metadata, "LICENSE");
    description       = VuoJsonUtilities::parseString(metadata, "DESCRIPTION");
    homepageLink      = VuoJsonUtilities::parseObjectString(metadata, "LINKS", "HOMEPAGE");
    documentationLink = VuoJsonUtilities::parseObjectString(metadata, "LINKS", "DOCUMENTATION");
    categories        = VuoJsonUtilities::parseArrayOfStrings(metadata, "CATEGORIES");
    keywords          = VuoJsonUtilities::parseArrayOfStrings(metadata, "KEYWORDS");
    examples          = VuoJsonUtilities::parseArrayOfStrings(metadata, "EXAMPLES");
 
    json_object *passes;
    if (json_object_object_get_ex(metadata, "PASSES", &passes)
        && ((json_object_is_type(passes, json_type_array ) && json_object_array_length(passes))
         || (json_object_is_type(passes, json_type_object) && json_object_object_length(passes))))
        throw VuoException("This shader uses ISF's multipass feature, which Vuo doesn't support yet.");
 
    json_object *imported;
    if (json_object_object_get_ex(metadata, "IMPORTED", &imported)
     && ((json_object_is_type(imported, json_type_array ) && json_object_array_length(imported))
      || (json_object_is_type(imported, json_type_object) && json_object_object_length(imported))))
        throw VuoException("This shader uses ISF's image-importing feature, which Vuo doesn't support yet.");
 
    bool hasInputImage = false;
    bool hasStartImage = false;
    bool hasEndImage = false;
    bool hasProgress = false;
    json_object *inputsArray;
    if (json_object_object_get_ex(metadata, "INPUTS", &inputsArray))
    {
        int inputCount = json_object_array_length(inputsArray);
        for (int i = 0; i < inputCount; ++i)
        {
            json_object *inputObject = json_object_array_get_idx(inputsArray, i);
            string key = VuoJsonUtilities::parseString(inputObject, "NAME");
            string type = VuoJsonUtilities::parseString(inputObject, "TYPE");
            string name = VuoJsonUtilities::parseString(inputObject, "LABEL");
 
            if (key == "inputImage")
                hasInputImage = true;
            else if (key == "startImage")
                hasStartImage = true;
            else if (key == "endImage")
                hasEndImage = true;
            else if (key == "progress")
                hasProgress = true;
 
            string vuoType = vuoTypeForIsfType(type);
            if (vuoType.empty())
            {
                VUserLog("Warning: Input port '%s' has unknown type '%s'.", key.c_str(), type.c_str());
                continue;
            }
 
            json_object *vuoPortDetails = json_object_new_object();
 
            if (name.empty() && key == "inputImage")
                name = "Image";
 
            if (!name.empty())
                json_object_object_add(vuoPortDetails, "name", json_object_new_string(name.c_str()));
 
            json_object *defaultValue = NULL;
            if (json_object_object_get_ex(inputObject, "DEFAULT", &defaultValue))
                json_object_object_add(vuoPortDetails, "default", defaultValue);
 
            json_object *minValue = NULL;
            if (json_object_object_get_ex(inputObject, "MIN", &minValue))
                json_object_object_add(vuoPortDetails, "suggestedMin", minValue);
            else
            {
                if (vuoType == "VuoReal")
                    json_object_object_add(vuoPortDetails, "suggestedMin", json_object_new_double(0));
                else if (vuoType == "VuoPoint2d")
                {
                    json_object_object_add(vuoPortDetails, "scaleToSamplerRect", json_object_new_boolean(true));
                    json_object_object_add(vuoPortDetails, "suggestedMin", json_object_new_string("0,0"));
                }
            }
 
            json_object *maxValue = NULL;
            if (json_object_object_get_ex(inputObject, "MAX", &maxValue))
                json_object_object_add(vuoPortDetails, "suggestedMax", maxValue);
            else
            {
                if (vuoType == "VuoReal")
                    json_object_object_add(vuoPortDetails, "suggestedMax", json_object_new_double(1));
                else if (vuoType == "VuoPoint2d")
                {
                    json_object_object_add(vuoPortDetails, "scaleToSamplerRect", json_object_new_boolean(true));
                    json_object_object_add(vuoPortDetails, "suggestedMax", json_object_new_string("1,1"));
                }
            }
 
            json_object *stepValue = NULL;
            if (json_object_object_get_ex(inputObject, "STEP", &stepValue))
                json_object_object_add(vuoPortDetails, "suggestedStep", stepValue);
 
            if (VuoStringUtilities::beginsWith(vuoType, "VuoList_"))
            {
                json_object *maxItemsValue = NULL;
                if (json_object_object_get_ex(inputObject, "MAX_ITEMS", &maxItemsValue))
                    json_object_object_add(vuoPortDetails, "maxItems", maxItemsValue);
            }
 
            json_object *values = NULL;
            json_object *labels = NULL;
            if (json_object_object_get_ex(inputObject, "VALUES", &values)
             && json_object_object_get_ex(inputObject, "LABELS", &labels))
            {
                json_object *menuItems = json_object_new_array();
                int valueCount = json_object_array_length(values);
                for (int i = 0; i < valueCount; ++i)
                {
                    json_object *menuItem = json_object_new_object();
                    json_object_object_add(menuItem, "value", json_object_array_get_idx(values, i));
                    json_object_object_add(menuItem, "name", json_object_array_get_idx(labels, i));
                    json_object_array_add(menuItems, menuItem);
                }
                json_object_object_add(vuoPortDetails, "menuItems", menuItems);
            }
 
            _inputPorts.push_back((Port){ key, vuoType, vuoPortDetails });
        }
    }
 
    json_object *outputsArray;
    if (json_object_object_get_ex(metadata, "OUTPUTS", &outputsArray))
    {
        int outputCount = json_object_array_length(outputsArray);
        for (int i = 0; i < outputCount; ++i)
        {
            json_object *outputObject = json_object_array_get_idx(outputsArray, i);
            outputKey  = VuoJsonUtilities::parseString(outputObject, "NAME");
            outputName = VuoJsonUtilities::parseString(outputObject, "LABEL");
        }
    }
 
    if (typeString == "IMAGE")
    {
        if (hasInputImage)
            _type = GLSLImageFilter;
        else if (hasStartImage && hasEndImage && hasProgress)
            _type = GLSLImageTransition;
        else
            _type = GLSLImageGenerator;
 
        if (outputKey.empty())
            outputKey = "outputImage";
        if (outputName.empty())
            outputName = VuoStringUtilities::expandCamelCase(outputKey);
    }
    else if (typeString == "OBJECT_RENDER")
    {
        _type = GLSLObjectRenderer;
 
        if (outputKey.empty())
            outputKey = "shader";
        if (outputName.empty())
            outputName = VuoStringUtilities::expandCamelCase(outputKey);
    }
    else if (typeString == "OBJECT_FILTER")
    {
        _type = GLSLObjectFilter;
 
        if (outputKey.empty())
            outputKey = "outputObject";
        if (outputName.empty())
            outputName = VuoStringUtilities::expandCamelCase(outputKey);
    }
 
    _vuoModuleMetadata = json_object_new_object();
 
    string title = (! _name.empty() ? _name : normalizedBasename);
    json_object_object_add(_vuoModuleMetadata, "title", json_object_new_string(title.c_str()));
 
    string metadataDescription = description;
    if (!copyright.empty())
        metadataDescription += "\n\n" + copyright;
    if (!metadataDescription.empty())
        json_object_object_add(_vuoModuleMetadata, "description", json_object_new_string(metadataDescription.c_str()));
 
    if (!shaderVersion.empty())
        json_object_object_add(_vuoModuleMetadata, "version", json_object_new_string(shaderVersion.c_str()));
    if (!keywords.empty())
        json_object_object_add(_vuoModuleMetadata, "keywords", VuoJsonUtilities::getJson(keywords));
 
    if (!examples.empty())
    {
        json_object *nodeMetadataJson = json_object_new_object();
        json_object_object_add(nodeMetadataJson, "exampleCompositions", VuoJsonUtilities::getJson(examples));
        json_object_object_add(_vuoModuleMetadata, "node", nodeMetadataJson);
    }
 
    if (_type == VuoShaderFile::GLSLImageFilter
     || _type == VuoShaderFile::GLSLImageGenerator
     || _type == VuoShaderFile::GLSLImageTransition
     || _type == VuoShaderFile::GLSLObjectFilter)
    {
        json_object *dependenciesJson = json_object_new_array();
 
        if (_type == VuoShaderFile::GLSLImageFilter
         || _type == VuoShaderFile::GLSLImageGenerator
         || _type == VuoShaderFile::GLSLImageTransition)
            json_object_array_add(dependenciesJson, json_object_new_string("VuoImageRenderer"));
        else if (_type == VuoShaderFile::GLSLObjectFilter)
            json_object_array_add(dependenciesJson, json_object_new_string("VuoSceneObjectRenderer"));
 
        json_object_object_add(_vuoModuleMetadata, "dependencies", dependenciesJson);
    }
}
 
string VuoShaderFile::vuoTypeForIsfType(string isfType)
{
    if (isfType == "event")
        return "event";
 
    else if (isfType == "bool")
        return "VuoBoolean";
    else if (isfType == "long")
        return "VuoInteger";
    else if (isfType == "float")
        return "VuoReal";
    else if (isfType == "point2D")
        return "VuoPoint2d";
    else if (isfType == "point3D")
        return "VuoPoint3d";
    else if (isfType == "point4D")
        return "VuoPoint4d";
    else if (isfType == "color")
        return "VuoColor";
 
    else if (isfType == "bool[]")
        return "VuoList_VuoBoolean";
    else if (isfType == "long[]")
        return "VuoList_VuoInteger";
    else if (isfType == "float[]")
        return "VuoList_VuoReal";
    else if (isfType == "point2D[]")
        return "VuoList_VuoPoint2d";
    else if (isfType == "point3D[]")
        return "VuoList_VuoPoint3d";
    else if (isfType == "point4D[]")
        return "VuoList_VuoPoint4d";
    else if (isfType == "color[]")
        return "VuoList_VuoColor";
 
    else if (isfType == "image")
        return "VuoImage";
 
    else if (isfType == "size")
        return "VuoSize";
    else if (isfType == "colorDepth")
        return "VuoImageColorDepth";
 
    return "";
}
 
string VuoShaderFile::isfTypeForVuoType(string vuoType)
{
    if (vuoType == "event")
        return "event";
    else if (vuoType == "VuoBoolean")
        return "bool";
    else if (vuoType == "VuoInteger")
        return "long";
    else if (vuoType == "VuoReal")
        return "float";
    else if (vuoType == "VuoPoint2d")
        return "point2D";
    else if (vuoType == "VuoPoint3d")
        return "point3D";
    else if (vuoType == "VuoPoint4d")
        return "point4D";
    else if (vuoType == "VuoColor")
        return "color";
 
    else if (vuoType == "VuoList_VuoBoolean")
        return "bool[]";
    else if (vuoType == "VuoList_VuoInteger")
        return "long[]";
    else if (vuoType == "VuoList_VuoReal")
        return "float[]";
    else if (vuoType == "VuoList_VuoPoint2d")
        return "point2D[]";
    else if (vuoType == "VuoList_VuoPoint3d")
        return "point3D[]";
    else if (vuoType == "VuoList_VuoPoint4d")
        return "point4D[]";
    else if (vuoType == "VuoList_VuoColor")
        return "color[]";
 
    else if (vuoType == "VuoImage")
        return "image";
 
    else if (vuoType == "VuoSize")
        return "size";
    else if (vuoType == "VuoImageColorDepth")
        return "colorDepth";
 
    return "";
}
 
set<string> VuoShaderFile::supportedVuoTypes()
{
    set<string> types;
 
    types.insert("VuoBoolean");
    types.insert("VuoInteger");
    types.insert("VuoReal");
    types.insert("VuoPoint2d");
    types.insert("VuoPoint3d");
    types.insert("VuoPoint4d");
    types.insert("VuoColor");
 
    types.insert("VuoList_VuoBoolean");
    types.insert("VuoList_VuoInteger");
    types.insert("VuoList_VuoReal");
    types.insert("VuoList_VuoPoint2d");
    types.insert("VuoList_VuoPoint3d");
    types.insert("VuoList_VuoPoint4d");
    types.insert("VuoList_VuoColor");
 
    types.insert("VuoImage");
    types.insert("VuoSize");
    types.insert("VuoImageColorDepth");
 
    return types;
}
 
string VuoShaderFile::glslDeclarationForPort(Port port)
{
    string maxItems = to_string(VuoJsonUtilities::parseInt(port.vuoPortDetails, "maxItems", 16));
 
    if (port.vuoTypeName == "event"
     || port.vuoTypeName == "VuoBoolean")
        return "uniform bool " + port.key + ";\n";
    else if (port.vuoTypeName == "VuoInteger")
        return "uniform int " + port.key + ";\n";
    else if (port.vuoTypeName == "VuoReal")
        return "uniform float " + port.key + ";\n";
    else if (port.vuoTypeName == "VuoPoint2d")
        return "uniform vec2 " + port.key + ";\n";
    else if (port.vuoTypeName == "VuoPoint3d")
        return "uniform vec3 " + port.key + ";\n";
    else if (port.vuoTypeName == "VuoPoint4d")
        return "uniform vec4 " + port.key + ";\n";
    else if (port.vuoTypeName == "VuoColor")
        return "uniform vec4 " + port.key + ";\n";
 
    else if (port.vuoTypeName == "VuoList_VuoBoolean")
        return "uniform bool " + port.key + "[" + maxItems + "];\n"
               "uniform int _" + port.key + "_length;\n";
    else if (port.vuoTypeName == "VuoList_VuoInteger")
        return "uniform int " + port.key + "[" + maxItems + "];\n"
               "uniform int _" + port.key + "_length;\n";
    else if (port.vuoTypeName == "VuoList_VuoReal")
        return "uniform float " + port.key + "[" + maxItems + "];\n"
               "uniform int _" + port.key + "_length;\n";
    else if (port.vuoTypeName == "VuoList_VuoPoint2d")
        return "uniform vec2 " + port.key + "[" + maxItems + "];\n"
               "uniform int _" + port.key + "_length;\n";
    else if (port.vuoTypeName == "VuoList_VuoPoint3d")
        return "uniform vec3 " + port.key + "[" + maxItems + "];\n"
               "uniform int _" + port.key + "_length;\n";
    else if (port.vuoTypeName == "VuoList_VuoPoint4d")
        return "uniform vec4 " + port.key + "[" + maxItems + "];\n"
               "uniform int _" + port.key + "_length;\n";
    else if (port.vuoTypeName == "VuoList_VuoColor")
        return "uniform vec4 " + port.key + "[" + maxItems + "];\n"
               "uniform int _" + port.key + "_length;\n";
 
    else if (port.vuoTypeName == "VuoImage")
        return "//uniform VuoImage " + port.key + ";\n" // We don't know the sampler type until execution time, so use a placeholder.
               "uniform vec4 _" + port.key + "_imgRect;\n"
               "uniform vec2 _" + port.key + "_imgSize;\n"
               "uniform bool _" + port.key + "_flip;\n";
 
    return "";
}
 
void VuoShaderFile::saveStage(string filePath, string &source, json_object *vuoModuleMetadata)
{
    if (source.empty())
    {
        // This stage has been disabled.  Delete the file,
        // to avoid leaving stale files around.
        if (VuoFileUtilities::fileExists(filePath))
            VuoFileUtilities::moveFileToTrash(filePath);
        return;
    }
 
    string fileContents = stageFileContents(source, vuoModuleMetadata);
 
    VuoFileUtilities::writeStringToFile(fileContents, filePath);
}
 
string VuoShaderFile::stageFileContents(string &source, json_object *vuoModuleMetadata)
{
    ostringstream ss;
    if (vuoModuleMetadata)
    {
        ss << "/*";
 
        json_object *isfMetadata = json_object_new_object();
 
        if (isfVersion.empty())
            json_object_object_add(isfMetadata, "ISFVSN", json_object_new_string("2.0"));
        else
            json_object_object_add(isfMetadata, "ISFVSN", json_object_new_string(isfVersion.c_str()));
 
        json_object_object_add(isfMetadata, "TYPE", json_object_new_string(typeNameISF().c_str()));
 
        if (!_name.empty())
            json_object_object_add(isfMetadata, "LABEL", json_object_new_string(_name.c_str()));
 
        if (!shaderVersion.empty())
            json_object_object_add(isfMetadata, "VSN", json_object_new_string(shaderVersion.c_str()));
 
        if (!copyright.empty())
            json_object_object_add(isfMetadata, "CREDIT", json_object_new_string(copyright.c_str()));
 
        if (!license.empty())
            json_object_object_add(isfMetadata, "LICENSE", json_object_new_string(license.c_str()));
 
        if (!description.empty())
            json_object_object_add(isfMetadata, "DESCRIPTION", json_object_new_string(description.c_str()));
 
        if (!homepageLink.empty() || !documentationLink.empty())
        {
            json_object *links = json_object_new_object();
            if (!homepageLink.empty())
                json_object_object_add(links, "HOMEPAGE", json_object_new_string(homepageLink.c_str()));
            if (!documentationLink.empty())
                json_object_object_add(links, "DOCUMENTATION", json_object_new_string(documentationLink.c_str()));
            json_object_object_add(isfMetadata, "LINKS", links);
        }
 
        if (!categories.empty())
            json_object_object_add(isfMetadata, "CATEGORIES", VuoJsonUtilities::getJson(categories));
 
        if (!keywords.empty())
            json_object_object_add(isfMetadata, "KEYWORDS", VuoJsonUtilities::getJson(keywords));
 
        if (!examples.empty())
            json_object_object_add(isfMetadata, "EXAMPLES", VuoJsonUtilities::getJson(examples));
 
        // INPUTS
        if (!_inputPorts.empty())
        {
            json_object *inputs = json_object_new_array();
            for (vector<Port>::iterator i = _inputPorts.begin(); i != _inputPorts.end(); ++i)
            {
                json_object *input = json_object_new_object();
 
                if (!i->key.empty())
                    json_object_object_add(input, "NAME", json_object_new_string(i->key.c_str()));
 
                json_object_object_add(input, "TYPE", json_object_new_string(isfTypeForVuoType(i->vuoTypeName).c_str()));
 
                json_object *nameValue = NULL;
                if (json_object_object_get_ex(i->vuoPortDetails, "name", &nameValue))
                    json_object_object_add(input, "LABEL", nameValue);
 
                json_object *defaultValue = NULL;
                if (json_object_object_get_ex(i->vuoPortDetails, "default", &defaultValue))
                {
                    // Convert Vuo serialization to ISF serialization.
                    if (VuoStringUtilities::beginsWith(i->vuoTypeName, "VuoPoint")
                     && json_object_get_type(defaultValue) == json_type_object)
                    {
                        json_object *x = nullptr;
                        json_object *y = nullptr;
                        json_object *z = nullptr;
                        json_object *w = nullptr;
                        json_object_object_get_ex(defaultValue, "x", &x);
                        json_object_object_get_ex(defaultValue, "y", &y);
                        json_object_object_get_ex(defaultValue, "z", &z);
                        json_object_object_get_ex(defaultValue, "w", &w);
 
                        defaultValue = json_object_new_array();
                        json_object_array_add(defaultValue, x);
                        json_object_array_add(defaultValue, y);
                        if (i->vuoTypeName == "VuoPoint3d" || i->vuoTypeName == "VuoPoint4d")
                            json_object_array_add(defaultValue, z);
                        if (i->vuoTypeName == "VuoPoint4d")
                            json_object_array_add(defaultValue, w);
                    }
 
                    json_object_object_add(input, "DEFAULT", defaultValue);
                }
 
                json_object *scaleToSamplerRectValue = NULL;
                if (!(json_object_object_get_ex(i->vuoPortDetails, "scaleToSamplerRect", &scaleToSamplerRectValue)
                   && json_object_get_boolean(scaleToSamplerRectValue)))
                {
                    json_object *minValue = NULL;
                    if (json_object_object_get_ex(i->vuoPortDetails, "suggestedMin", &minValue))
                        json_object_object_add(input, "MIN", minValue);
 
                    json_object *maxValue = NULL;
                    if (json_object_object_get_ex(i->vuoPortDetails, "suggestedMax", &maxValue))
                        json_object_object_add(input, "MAX", maxValue);
                }
 
                json_object *stepValue = NULL;
                if (json_object_object_get_ex(i->vuoPortDetails, "suggestedStep", &stepValue))
                    json_object_object_add(input, "STEP", stepValue);
 
                json_object *maxItemsValue = NULL;
                if (json_object_object_get_ex(i->vuoPortDetails, "maxItems", &maxItemsValue))
                    json_object_object_add(input, "MAX_ITEMS", maxItemsValue);
 
                json_object *menuItemsValue = NULL;
                if (json_object_object_get_ex(i->vuoPortDetails, "menuItems", &menuItemsValue))
                {
                    json_object *valueItems = json_object_new_array();
                    json_object *labelItems = json_object_new_array();
                    int len = json_object_array_length(menuItemsValue);
                    for (int mi = 0; mi < len; ++mi)
                    {
                        json_object *menuItem = json_object_array_get_idx(menuItemsValue, mi);
 
                        json_object *valueItem = nullptr;
                        json_object_object_get_ex(menuItem, "value", &valueItem);
                        json_object_array_add(valueItems, valueItem);
 
                        json_object *nameItem = nullptr;
                        json_object_object_get_ex(menuItem, "name", &nameItem);
                        json_object_array_add(labelItems, nameItem);
                    }
                    json_object_object_add(input, "VALUES", valueItems);
                    json_object_object_add(input, "LABELS", labelItems);
                }
 
                json_object_array_add(inputs, input);
            }
            json_object_object_add(isfMetadata, "INPUTS", inputs);
        }
 
        // OUTPUTS
        {
            json_object *output = json_object_new_object();
 
            if (_type == VuoShaderFile::GLSLImageFilter
             || _type == VuoShaderFile::GLSLImageGenerator
             || _type == VuoShaderFile::GLSLImageTransition)
            {
                if (outputKey != "outputImage")
                    json_object_object_add(output, "NAME", json_object_new_string(outputKey.c_str()));
                if (outputName != "Output Image")
                    json_object_object_add(output, "LABEL", json_object_new_string(outputName.c_str()));
            }
            else if (_type == VuoShaderFile::GLSLObjectRenderer)
            {
                if (outputKey != "shader")
                    json_object_object_add(output, "NAME", json_object_new_string(outputKey.c_str()));
                if (outputName != "Shader")
                    json_object_object_add(output, "LABEL", json_object_new_string(outputName.c_str()));
            }
            else
            {
                if (outputKey != "outputObject")
                    json_object_object_add(output, "NAME", json_object_new_string(outputKey.c_str()));
                if (outputName != "Output Object")
                    json_object_object_add(output, "LABEL", json_object_new_string(outputName.c_str()));
            }
 
            if (json_object_object_length(output))
            {
                json_object *outputs = json_object_new_array();
                json_object_array_add(outputs, output);
                json_object_object_add(isfMetadata, "OUTPUTS", outputs);
            }
        }
 
        string json = json_object_to_json_string_ext(isfMetadata, JSON_C_TO_STRING_PRETTY);
        ss << spacesToTabs(json);
        ss << "*/\n\n";
    }
 
    ss << source;
 
    if (source[source.length() - 1] != '\n')
        ss << "\n";
 
    return ss.str();
}
 
string VuoShaderFile::spacesToTabs(string &str)
{
    stringstream strStream(str);
    string ln;
    ostringstream out;
    while (getline(strStream, ln))
    {
        size_t spaces = ln.find_first_not_of(' ');
        out << string(spaces / 2, '\t');
        out << ln.substr(spaces);
        if (!strStream.eof())
            out << '\n';
    }
    return out.str();
}