renderDelegate.h

//
// Copyright 2016 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_HD_RENDER_DELEGATE_H
#define PXR_IMAGING_HD_RENDER_DELEGATE_H

#include "pxr/pxr.h"
#include "pxr/imaging/hd/api.h"
#include "pxr/imaging/hd/aov.h"
#include "pxr/imaging/hd/changeTracker.h"
#include "pxr/imaging/hd/command.h"
#include "pxr/base/vt/dictionary.h"
#include "pxr/base/tf/token.h"

#include <memory>

PXR_NAMESPACE_OPEN_SCOPE

class SdfPath;
class HdRprim;
class HdSprim;
class HdBprim;
class HdSceneDelegate;
class HdRenderIndex;
class HdRenderPass;
class HdInstancer;
class HdDriver;

using HdRenderPassSharedPtr = std::shared_ptr<class HdRenderPass>;
using HdRenderPassStateSharedPtr = std::shared_ptr<class HdRenderPassState>;
using HdResourceRegistrySharedPtr = std::shared_ptr<class HdResourceRegistry>;
using HdDriverVector = std::vector<HdDriver*>;

class HdRenderParam 
{
public:
    HdRenderParam() {}
    HD_API
    virtual ~HdRenderParam();

private:
    // Hydra will not attempt to copy the class.
    HdRenderParam(const HdRenderParam &) = delete;
    HdRenderParam &operator =(const HdRenderParam &) = delete;
};

typedef TfHashMap<TfToken, VtValue, TfToken::HashFunctor> HdRenderSettingsMap;

struct HdRenderSettingDescriptor 
{
    // A human readable name.
    std::string name;
    // The key for HdRenderDelegate::SetRenderSetting/GetRenderSetting.
    TfToken key;
    // The default value.
    VtValue defaultValue;
};

typedef std::vector<HdRenderSettingDescriptor> HdRenderSettingDescriptorList;

class HdRenderDelegate
{
public:
    HD_API
    virtual ~HdRenderDelegate();

    HD_API
    virtual void SetDrivers(HdDriverVector const& drivers);

    virtual const TfTokenVector &GetSupportedRprimTypes() const = 0;

    virtual const TfTokenVector &GetSupportedSprimTypes() const = 0;


    virtual const TfTokenVector &GetSupportedBprimTypes() const = 0;

    HD_API
    virtual HdRenderParam *GetRenderParam() const;

    virtual HdResourceRegistrySharedPtr GetResourceRegistry() const = 0;

    HD_API
    virtual void SetRenderSetting(TfToken const& key, VtValue const& value);

    HD_API
    virtual VtValue GetRenderSetting(TfToken const& key) const;

    template<typename T>
    T GetRenderSetting(TfToken const& key, T const& defValue) const {
        return GetRenderSetting(key).Cast<T>().GetWithDefault(defValue);
    }

    HD_API
    virtual HdRenderSettingDescriptorList GetRenderSettingDescriptors() const;

    HD_API
    virtual unsigned int GetRenderSettingsVersion() const;

    HD_API
    virtual VtDictionary GetRenderStats() const;


    HD_API
    virtual bool IsPauseSupported() const;

    HD_API
    virtual bool Pause();

    HD_API
    virtual bool Resume();

    HD_API
    virtual bool IsStopSupported() const;

    HD_API
    virtual bool Stop();

    HD_API
    virtual bool Restart();


    virtual HdRenderPassSharedPtr CreateRenderPass(HdRenderIndex *index,
                                      HdRprimCollection const& collection) = 0;

    HD_API
    virtual HdRenderPassStateSharedPtr CreateRenderPassState() const;


    virtual HdInstancer *CreateInstancer(HdSceneDelegate *delegate,
                                         SdfPath const& id) = 0;

    virtual void DestroyInstancer(HdInstancer *instancer) = 0;



    virtual HdRprim *CreateRprim(TfToken const& typeId,
                                 SdfPath const& rprimId) = 0;

    virtual void DestroyRprim(HdRprim *rPrim) = 0;

    virtual HdSprim *CreateSprim(TfToken const& typeId,
                                 SdfPath const& sprimId) = 0;

    virtual HdSprim *CreateFallbackSprim(TfToken const& typeId) = 0;

    virtual void DestroySprim(HdSprim *sprim) = 0;

    virtual HdBprim *CreateBprim(TfToken const& typeId,
                                 SdfPath const& bprimId) = 0;


    virtual HdBprim *CreateFallbackBprim(TfToken const& typeId) = 0;

    virtual void DestroyBprim(HdBprim *bprim) = 0;


    virtual void CommitResources(HdChangeTracker *tracker) = 0;

    
    HD_API
    virtual TfToken GetMaterialBindingPurpose() const;


    HD_API
    virtual TfToken GetMaterialNetworkSelector() const;

    HD_API
    virtual TfTokenVector GetMaterialRenderContexts() const;

    HD_API
    virtual bool IsPrimvarFilteringNeeded() const;

    HD_API
    virtual TfTokenVector GetShaderSourceTypes() const;


    HD_API
    virtual HdAovDescriptor GetDefaultAovDescriptor(TfToken const& name) const;

    
    HD_API
    virtual HdCommandDescriptors GetCommandDescriptors() const;

    HD_API
    virtual bool InvokeCommand(
        const TfToken &command,
        const HdCommandArgs &args = HdCommandArgs());


protected:
    HD_API
    HdRenderDelegate();
    HD_API
    HdRenderDelegate(HdRenderSettingsMap const& settingsMap);

    HdRenderDelegate(const HdRenderDelegate &) = delete;
    HdRenderDelegate &operator=(const HdRenderDelegate &) = delete;

    HD_API
    void _PopulateDefaultSettings(
        HdRenderSettingDescriptorList const& defaultSettings);

    HdRenderSettingsMap _settingsMap;
    unsigned int _settingsVersion;
};

PXR_NAMESPACE_CLOSE_SCOPE

#endif //PXR_IMAGING_HD_RENDER_DELEGATE_H