skydomeTask.h

//
// Copyright 2021 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef HDX_SKYDOME_TASK_H
#define HDX_SKYDOME_TASK_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hdx/api.h"
#include "pxr/imaging/hdx/renderSetupTask.h"
#include "pxr/imaging/hdx/task.h"
 
#include "pxr/base/gf/matrix4f.h"
#include "pxr/base/gf/vec2f.h"
#include "pxr/usd/sdf/path.h"
#include "pxr/imaging/hgi/graphicsCmds.h"
 
#include "pxr/imaging/glf/simpleLightingContext.h"
 
PXR_NAMESPACE_OPEN_SCOPE
 
class HdxSkydomeTask : public HdxTask
{
public:
    using TaskParams = HdxRenderTaskParams;
    
    HDX_API
    HdxSkydomeTask(HdSceneDelegate* delegate, SdfPath const& id);
 
    HDX_API
    ~HdxSkydomeTask() override;
 
    HDX_API
    void Prepare(HdTaskContext* ctx,
                 HdRenderIndex* renderIndex) override;
 
    HDX_API
    void Execute(HdTaskContext* ctx) override;
 
protected:
    HDX_API
    void _Sync(HdSceneDelegate* delegate,
              HdTaskContext* ctx,
              HdDirtyBits* dirtyBits) override;
 
private:
    HdRenderIndex* _renderIndex;
    HgiTextureHandle _skydomeTexture;
    HgiSamplerHandle _skydomeSampler;
    // Optional internal render setup task, for params unpacking.
    // This is used for aov bindings, camera matrices and framing
    HdxRenderSetupTaskSharedPtr _setupTask;
    unsigned int _settingsVersion;
    bool _skydomeVisibility;
 
    HdxSkydomeTask() = delete;
    HdxSkydomeTask(const HdxSkydomeTask &) = delete;
    HdxSkydomeTask &operator =(const HdxSkydomeTask &) = delete;
 
    HdRenderPassStateSharedPtr _GetRenderPassState(HdTaskContext *ctx) const;
    bool _GetSkydomeTexture(HdTaskContext* ctx);
    void _SetFragmentShader();
 
    // Utility function to update the shader uniform parameters.
    // Returns true if the values were updated. False if unchanged.
    bool _UpdateParameterBuffer(
        const GfMatrix4f& invProjMatrix,
        const GfMatrix4f& viewToWorldMatrix,
        const GfMatrix4f& lightTransform);
 
    // This struct must match ParameterBuffer in Skydome.glslfx.
    // Be careful to remember the std430 rules.
    struct _ParameterBuffer 
    {
        GfMatrix4f invProjMatrix;
        GfMatrix4f viewToWorldMatrix;
        GfMatrix4f lightTransform;
    };
 
    std::unique_ptr<class HdxFullscreenShader> _compositor;
    _ParameterBuffer _parameterData;
};
 
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif