//
// 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_PIPELINE_H
#define PXR_IMAGING_HGI_METAL_PIPELINE_H

#include "pxr/pxr.h"
#include "pxr/imaging/hgi/graphicsCmdsDesc.h"
#include "pxr/imaging/hgi/graphicsPipeline.h"

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

#include <vector>


PXR_NAMESPACE_OPEN_SCOPE

class HgiMetal;

/// \class HgiMetalPipeline
///
/// Metal implementation of HgiGraphicsPipeline.
///
class HgiMetalGraphicsPipeline final : public HgiGraphicsPipeline
{
public:
    HGIMETAL_API
    HgiMetalGraphicsPipeline(HgiMetal *hgi, HgiGraphicsPipelineDesc const& desc);

    HGIMETAL_API
    ~HgiMetalGraphicsPipeline() override;

    /// Apply pipeline state
    HGIMETAL_API
    void BindPipeline(id<MTLRenderCommandEncoder> renderEncoder);

private:
    HgiMetalGraphicsPipeline() = delete;
    HgiMetalGraphicsPipeline& operator=(const HgiMetalGraphicsPipeline&)=delete;
    HgiMetalGraphicsPipeline(const HgiMetalGraphicsPipeline&) = delete;
    
    void _CreateVertexDescriptor();
    void _CreateDepthStencilState(id<MTLDevice> device);
    void _CreateRenderPipelineState(id<MTLDevice> device);

    MTLVertexDescriptor *_vertexDescriptor;
    id<MTLDepthStencilState> _depthStencilState;
    id<MTLRenderPipelineState> _renderPipelineState;
};


PXR_NAMESPACE_CLOSE_SCOPE

#endif