glslfxConfig.h

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//
// Copyright 2016 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HIO_GLSLFX_CONFIG_H
#define PXR_IMAGING_HIO_GLSLFX_CONFIG_H
 
 
#include "pxr/pxr.h"
#include "pxr/imaging/hio/api.h"
#include "pxr/base/tf/token.h"
#include "pxr/base/vt/dictionary.h"
 
#include <string>
 
PXR_NAMESPACE_OPEN_SCOPE
 
class HioGlslfxConfig
{
public:
    enum Role {
        RoleNone = 0,
        RoleColor = 1,
    };
 
    class Parameter {
    public:
        Parameter(std::string const & name,
                  VtValue const & defaultValue,
                  std::string const & docString = "",
                  Role const & role = RoleNone) :
            name(name),
            defaultValue(defaultValue),
            docString(docString),
            role(role) { }
 
        std::string name;
        VtValue defaultValue;
        std::string docString;
        Role role;
    };
 
    typedef std::vector<Parameter> Parameters;
 
    class Texture {
    public:
        Texture(std::string const & name,
                VtValue const & defaultValue,
                std::string const & docString = "") :
            name(name),
            defaultValue(defaultValue),
            docString(docString) { }
 
        std::string name;
        VtValue defaultValue;
        std::string docString;
    };
 
    typedef std::vector<Texture> Textures;
 
    class Attribute {
    public:
        Attribute(std::string const & name,
                  VtValue const & defaultValue,
                  std::string const & docString = "") :
            name(name),
            defaultValue(defaultValue),
            docString(docString) { }
 
        std::string name;
        VtValue defaultValue;
        std::string docString;
    };
 
    typedef std::vector<Attribute> Attributes;
 
    HIO_API
    static HioGlslfxConfig * Read(TfToken const & technique,
                                  std::string const & input,
                                  std::string const & filename,
                                  std::string *errorStr);
 
    typedef std::vector<std::string> SourceKeys;
 
    typedef VtDictionary MetadataDictionary;
 
    HIO_API
    SourceKeys GetSourceKeys(TfToken const & shaderStageKey) const;
 
    HIO_API
    Parameters GetParameters() const;
 
    HIO_API
    Textures GetTextures() const;
 
    HIO_API
    Attributes GetAttributes() const;
 
    HIO_API
    MetadataDictionary GetMetadata() const;
 
private:
    // private ctor. should only be called by ::Read
    HioGlslfxConfig(TfToken const& technique,
                    VtDictionary const & dict,
                    std::string *errorStr);
 
    void _Init(VtDictionary const & dict, std::string *errorStr);
 
    Parameters _GetParameters(VtDictionary const & dict,
                              std::string *errorStr) const;
    Textures _GetTextures(VtDictionary const & dict,
                          std::string *errorStr) const;
 
    Attributes _GetAttributes(VtDictionary const & dict,
                              std::string *errorStr) const;
 
    MetadataDictionary _GetMetadata(VtDictionary const & dict,
                                    std::string *errorStr) const;
 
    typedef std::map<std::string, SourceKeys> _SourceKeyMap;
    _SourceKeyMap _GetSourceKeyMap(VtDictionary const & dict,
                                   std::string *errorStr) const;
 
    TfToken _technique;
    Parameters _params;
    Textures _textures;
    Attributes _attributes;
    MetadataDictionary _metadata;
    _SourceKeyMap _sourceKeyMap;
};
 
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif