task.h

//
// 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_IMAGING_HDX_TASK_H
#define PXR_IMAGING_HDX_TASK_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hdx/api.h"
#include "pxr/imaging/hd/task.h"
 
PXR_NAMESPACE_OPEN_SCOPE
 
class Hgi;
 
 
class HdxTask : public HdTask
{
public:
    HDX_API
    HdxTask(SdfPath const& id);
 
    HDX_API
    ~HdxTask() override;
 
    HDX_API
    virtual bool IsConverged() const;
 
    HDX_API 
    void Sync(
        HdSceneDelegate* delegate,
        HdTaskContext* ctx,
        HdDirtyBits* dirtyBits) override final;
 
protected:
    // This is called during the hydra Sync Phase via HdxTask::Sync.
    // Please see HdTask::Sync for Sync Phase documentation.
    virtual void _Sync(
        HdSceneDelegate* delegate,
        HdTaskContext* ctx,
        HdDirtyBits* dirtyBits) = 0;
 
    // Swaps the color target and colorIntermediate target.
    // This is used when a task wishes to read from the color and also write
    // to it. We use two color targets and ping-pong between them.
    HDX_API
    void _ToggleRenderTarget(HdTaskContext* ctx);
 
    // Swaps the depth target and depthIntermediate target.
    // This is used when a task wishes to read from the depth and also write
    // to it. We use two depth targets and ping-pong between them.
    HDX_API
    void _ToggleDepthTarget(HdTaskContext* ctx);
 
    // Helper function to facilitate texture ping-ponging.
    HDX_API
    void _SwapTextures(
        HdTaskContext* ctx,
        const TfToken& textureToken,
        const TfToken& textureIntermediateToken);
 
    // Return pointer to Hydra Graphics Interface.
    HDX_API
    Hgi* _GetHgi() const;
 
private:
    Hgi* _hgi;
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif