o3de-atom-sampleviewer/Gem/Code/Source/BakedShaderVariantExampleComponent.h

/*
 * Copyright (c) Contributors to the Open 3D Engine Project. For complete copyright and license terms please see the LICENSE at the root of this distribution.
 * 
 * SPDX-License-Identifier: Apache-2.0 OR MIT
 *
 */

#pragma once

#include <Atom/RPI.Reflect/Material/MaterialAsset.h>
#include <Atom/RPI.Reflect/Model/ModelAsset.h>
#include <AzCore/Component/TickBus.h>
#include <AzFramework/Asset/AssetSystemTypes.h>
#include <CommonSampleComponentBase.h>
#include <Utils/ImGuiSidebar.h>
#include <Utils/ImGuiAssetBrowser.h>
#include <Utils/ImGuiMaterialDetails.h>
#include <Utils/ImGuiHistogramQueue.h>

namespace AtomSampleViewer
{
    //! This test is for collecting metrics on the shader variant system by allowing users to switch from using
    //! root shader variant to the optimized variant. To generate shader variants, use the Shader Management Console.
    //! The shader options used by the material can be verified using the Material Details button in the sidebar.
    //! FPS and root pass metrics are shown on the sidebar as well. To view metrics for specific passes, use the GPU
    //! profiler.
    class BakedShaderVariantExampleComponent final
        : public CommonSampleComponentBase
        , public AZ::TickBus::Handler
        , public AZ::Data::AssetBus::Handler
    {
    public:
        AZ_COMPONENT(BakedShaderVariantExampleComponent, "{4986DD5D-347E-4E11-BBD5-E364061666A1}", CommonSampleComponentBase);
        BakedShaderVariantExampleComponent();

        static void Reflect(AZ::ReflectContext* context);

        // AZ::Component overrides...
        void Activate() override;
        void Deactivate() override;

    private:
        AZ_DISABLE_COPY_MOVE(BakedShaderVariantExampleComponent);

        // AZ::TickBus::Handler overrides...
        void OnTick(float deltaTime, AZ::ScriptTimePoint scriptTime) override;

        void MaterialChange();
        void SetRootVariantUsage(bool enabled);

        static constexpr uint32_t FrameTimeLogSize = 50;
        static constexpr uint32_t PassTimeLogSize = 50;
        ImGuiSidebar m_imguiSidebar;
        ImGuiMaterialDetails m_imguiMaterialDetails;
        ImGuiAssetBrowser m_materialBrowser;
        ImGuiHistogramQueue m_imGuiFrameTimer;
        ImGuiHistogramQueue m_imGuiForwardPassTimer;

        AZ::Render::MeshFeatureProcessorInterface* m_meshFeatureProcessor = nullptr;

        AZ::Data::Asset<AZ::RPI::MaterialAsset> m_materialAsset;
        AZ::Data::Instance<AZ::RPI::Material> m_material;
        AZ::Data::Asset<AZ::RPI::ModelAsset> m_modelAsset;
        AZ::Render::MeshFeatureProcessorInterface::MeshHandle m_meshHandle;

        AZ::RHI::Ptr<AZ::RPI::Pass> m_forwardPass;

        size_t m_selectedShaderIndex = 0;
    };
} // namespace AtomSampleViewer