//
//  DeferredFrameTransform.h
//  libraries/render-utils/src/
//
//  Created by Sam Gateau 6/3/2016.
//  Copyright 2016 High Fidelity, Inc.
//  Copyright 2024 Overte e.V.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

#ifndef hifi_DeferredFrameTransform_h
#define hifi_DeferredFrameTransform_h

#include <gpu/Resource.h>

#include <render/Forward.h>
#include <render/DrawTask.h>

// DeferredFrameTransform is  a helper class gathering in one place the needed camera transform
// and frame resolution needed for all the deferred rendering passes taking advantage of the Deferred buffers
class DeferredFrameTransform {
    friend class GenerateDeferredFrameTransform;
public:
    using UniformBufferView = gpu::BufferView;

    DeferredFrameTransform();

    void update(RenderArgs* args);

    UniformBufferView getFrameTransformBuffer() const { return _frameTransformBuffer; }

protected:

    // Class describing the uniform buffer with the transform info common to the AO shaders
    // It s changing every frame
#include "DeferredTransform_shared.slh"

    class FrameTransform : public _DeferredFrameTransform {
    public:
        FrameTransform() { infos.stereoInfo = glm::vec4(0.0f); }
    };

    UniformBufferView _frameTransformBuffer;
};

using DeferredFrameTransformPointer = std::shared_ptr<DeferredFrameTransform>;


class GenerateDeferredFrameTransform {
public:
    using Output = DeferredFrameTransformPointer;
    using JobModel = render::Job::ModelO<GenerateDeferredFrameTransform, Output>;

    GenerateDeferredFrameTransform(uint transformSlot) : _transformSlot(transformSlot) {}

    void run(const render::RenderContextPointer& renderContext, Output& frameTransform);

private:
    uint _transformSlot;
};

#endif // hifi_DeferredFrameTransform_h