shaderMetadataHelpers.h

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//
// Copyright 2018 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//

#ifndef PXR_USD_SDR_SHADER_METADATA_HELPERS_H
#define PXR_USD_SDR_SHADER_METADATA_HELPERS_H


#include "pxr/pxr.h"
#include "pxr/usd/sdr/api.h"
#include "pxr/base/tf/token.h"
#include "pxr/usd/sdr/declare.h"

#include <limits>

PXR_NAMESPACE_OPEN_SCOPE

namespace ShaderMetadataHelpers
{
    SDR_API
    bool
    IsTruthy(const TfToken& key, const NdrTokenMap& metadata);

    SDR_API
    std::string
    StringVal(const TfToken& key, const NdrTokenMap& metadata,
              const std::string& defaultValue = std::string());

    SDR_API
    TfToken
    TokenVal(const TfToken& key, const NdrTokenMap& metadata,
             const TfToken& defaultValue = TfToken());

    SDR_API
    int
    IntVal(const TfToken& key, const NdrTokenMap& metadata,
           int defaultValue = std::numeric_limits<int>::max());

    SDR_API
    NdrStringVec
    StringVecVal(const TfToken& key, const NdrTokenMap& metadata);

    SDR_API
    NdrTokenVec
    TokenVecVal(const TfToken& key, const NdrTokenMap& metadata);

    SDR_API
    NdrOptionVec
    OptionVecVal(const std::string& optionStr);

    SDR_API
    std::string
    CreateStringFromStringVec(const NdrStringVec& stringVec);

    SDR_API
    bool
    IsPropertyAnAssetIdentifier(const NdrTokenMap& metadata);

    SDR_API
    bool
    IsPropertyATerminal(const NdrTokenMap& metadata);

    // if it's a valid role as defined by SdrPropertyRole tokens.
    SDR_API
    TfToken
    GetRoleFromMetadata(const NdrTokenMap& metadata);
}

PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_USD_SDR_SHADER_METADATA_HELPERS_H