//
// Copyright 2020 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_IMAGING_HGI_METAL_SHADERFUNCTION_H
#define PXR_IMAGING_HGI_METAL_SHADERFUNCTION_H

#include "pxr/imaging/hgi/shaderFunction.h"

#include "pxr/imaging/hgiMetal/api.h"

#include <Metal/Metal.h>

PXR_NAMESPACE_OPEN_SCOPE

class HgiMetal;

///
/// \class HgiMetalShaderFunction
///
/// Metal implementation of HgiShaderFunction
///
class HgiMetalShaderFunction final : public HgiShaderFunction {
public:
    HGIMETAL_API
    ~HgiMetalShaderFunction() override;

    HGIMETAL_API
    bool IsValid() const override;

    HGIMETAL_API
    std::string const& GetCompileErrors() override;

    HGIMETAL_API
    size_t GetByteSizeOfResource() const override;

    HGIMETAL_API
    uint64_t GetRawResource() const override;

    /// Returns the gl resource id of the shader.
    HGIMETAL_API
    id<MTLFunction> GetShaderId() const;

protected:
    friend class HgiMetal;

    HGIMETAL_API
    HgiMetalShaderFunction(HgiMetal *hgi, HgiShaderFunctionDesc const& desc);

private:
    HgiMetalShaderFunction() = delete;
    HgiMetalShaderFunction & operator=(const HgiMetalShaderFunction&) = delete;
    HgiMetalShaderFunction(const HgiMetalShaderFunction&) = delete;

private:
    std::string _errors;

    id<MTLFunction> _shaderId;
};


PXR_NAMESPACE_CLOSE_SCOPE

#endif