XCEngine/managed/XCEngine.RenderPipelines.Universal/Rendering/Universal/RendererBackedRenderPipelineAsset.cs

using System;
using XCEngine;
using XCEngine.Rendering;

namespace XCEngine.Rendering.Universal
{
    public abstract class RendererBackedRenderPipelineAsset
        : ScriptableRenderPipelineAsset
    {
        public ScriptableRendererData[] rendererDataList =
            Array.Empty<ScriptableRendererData>();
        public int defaultRendererIndex = 0;
        private readonly ScriptableRendererDataCollection
            m_rendererDataCollection;
        private int m_rendererDataRuntimeStateHash;
        private bool m_rendererDataRuntimeStateHashResolved;

        protected RendererBackedRenderPipelineAsset()
        {
            m_rendererDataCollection =
                new ScriptableRendererDataCollection();
        }

        protected override ScriptableRenderPipeline CreatePipeline()
        {
            return CreateRendererBackedPipeline();
        }

        protected override void ConfigureCameraRenderRequest(
            CameraRenderRequestContext context)
        {
            ApplyResolvedRendererIndex(
                context,
                ResolveRendererIndex(context));

            ConfigureRendererCameraRequest(
                new RendererCameraRequestContext(context));

            ApplyResolvedRendererIndex(
                context,
                context != null
                    ? context.rendererIndex
                    : -1);

            ScriptableRendererData resolvedRendererData =
                ResolveRendererData(context);
            if (resolvedRendererData != null)
            {
                resolvedRendererData
                    .ConfigureCameraRenderRequestInstance(
                        context);
            }
        }

        protected override void ConfigureCameraFramePlan(
            ScriptableRenderPipelinePlanningContext context)
        {
            if (UsesExplicitFullscreenStagePlanning() &&
                context != null)
            {
                // Renderer-backed SRP owns fullscreen stage planning explicitly.
                context.ClearFullscreenStage(
                    CameraFrameStage.PostProcess);
                context.ClearFullscreenStage(
                    CameraFrameStage.FinalOutput);
            }

            ScriptableRendererData resolvedRendererData =
                ResolveRendererData(context);
            if (resolvedRendererData != null)
            {
                resolvedRendererData
                    .ConfigureCameraFramePlanInstance(
                        context);
            }
        }

        protected override bool ConfigureDirectionalShadowExecutionState(
            DirectionalShadowExecutionContext context)
        {
            ScriptableRendererData resolvedRendererData =
                ResolveRendererData(context);
            return resolvedRendererData != null &&
                   resolvedRendererData
                       .ConfigureDirectionalShadowExecutionStateInstance(
                           context);
        }

        protected override bool ConfigureRenderSceneSetup(
            RenderSceneSetupContext context)
        {
            ScriptableRendererData resolvedRendererData =
                ResolveRendererData(context);
            return resolvedRendererData != null &&
                   resolvedRendererData
                       .ConfigureRenderSceneSetupInstance(
                           context);
        }

        protected override void ReleaseRuntimeResources()
        {
            m_rendererDataCollection.ReleaseRuntimeResources(
                ref rendererDataList,
                ref defaultRendererIndex,
                CreateDefaultRendererData);
        }

        protected override void SynchronizeRuntimeResourceVersion()
        {
            m_rendererDataCollection.Synchronize(
                ref rendererDataList,
                ref defaultRendererIndex,
                ref m_rendererDataRuntimeStateHash,
                ref m_rendererDataRuntimeStateHashResolved,
                CreateDefaultRendererData,
                SetDirty);
        }

        protected virtual ScriptableRenderPipeline
        CreateRendererBackedPipeline()
        {
            return new RendererBackedRenderPipeline(this);
        }

        protected virtual void ConfigureRendererCameraRequest(
            RendererCameraRequestContext context)
        {
        }

        protected virtual int ResolveRendererIndex(
            CameraRenderRequestContext context)
        {
            return ResolveSelectedRendererIndex();
        }

        protected virtual ScriptableRendererData
        CreateDefaultRendererData()
        {
            return null;
        }

        protected virtual ScriptableRendererData[]
        CreateDefaultRendererDataList()
        {
            ScriptableRendererData defaultRendererData =
                CreateDefaultRendererData();
            return defaultRendererData != null
                ? new ScriptableRendererData[]
                {
                    defaultRendererData
                }
                : Array.Empty<ScriptableRendererData>();
        }

        protected virtual ScriptableRendererDataComposition
        CreateDefaultRendererDataComposition()
        {
            ScriptableRendererData[] defaultRendererDataList =
                CreateDefaultRendererDataList() ??
                Array.Empty<ScriptableRendererData>();
            return new ScriptableRendererDataComposition(
                defaultRendererDataList,
                defaultRendererDataList.Length > 0
                    ? 0
                    : -1);
        }

        protected virtual bool UsesExplicitFullscreenStagePlanning()
        {
            return true;
        }

        protected void ResetRendererDataToDefault()
        {
            ScriptableRendererDataComposition composition =
                CreateDefaultRendererDataComposition();
            rendererDataList = composition.rendererDataList;
            defaultRendererIndex =
                composition.defaultRendererIndex;
        }

        internal ScriptableRendererData GetDefaultRendererData()
        {
            return m_rendererDataCollection.GetDefaultRendererData(
                ref rendererDataList,
                ref defaultRendererIndex,
                CreateDefaultRendererData);
        }

        internal ScriptableRenderer GetDefaultRenderer()
        {
            return ResolveSelectedRenderer();
        }

        internal ScriptableRendererData ResolveSelectedRendererData()
        {
            return GetDefaultRendererData();
        }

        internal ScriptableRenderer ResolveSelectedRenderer()
        {
            ScriptableRendererData rendererData =
                ResolveSelectedRendererData();
            return rendererData != null
                ? rendererData.GetRendererInstance()
                : null;
        }

        internal ScriptableRendererData GetRendererData(
            int rendererIndex)
        {
            return m_rendererDataCollection.GetRendererData(
                ref rendererDataList,
                ref defaultRendererIndex,
                rendererIndex,
                CreateDefaultRendererData);
        }

        internal ScriptableRenderer ResolveRenderer(
            int rendererIndex)
        {
            ScriptableRendererData rendererData =
                GetRendererData(rendererIndex);
            return rendererData != null
                ? rendererData.GetRendererInstance()
                : null;
        }

        private int ResolveSelectedRendererIndex()
        {
            return m_rendererDataCollection
                .ResolveDefaultRendererIndex(
                    ref rendererDataList,
                    ref defaultRendererIndex,
                    CreateDefaultRendererData);
        }

        private ScriptableRendererData ResolveRendererData(
            CameraRenderRequestContext context)
        {
            return GetRendererData(
                context != null
                    ? context.rendererIndex
                    : -1);
        }

        private ScriptableRendererData ResolveRendererData(
            ScriptableRenderPipelinePlanningContext context)
        {
            return GetRendererData(
                context != null
                    ? context.rendererIndex
                    : -1);
        }

        private ScriptableRendererData ResolveRendererData(
            RenderSceneSetupContext context)
        {
            return GetRendererData(
                context != null
                    ? context.rendererIndex
                    : -1);
        }

        private ScriptableRendererData ResolveRendererData(
            DirectionalShadowExecutionContext context)
        {
            return GetRendererData(
                context != null
                    ? context.rendererIndex
                    : -1);
        }

        private void ApplyResolvedRendererIndex(
            CameraRenderRequestContext context,
            int rendererIndex)
        {
            if (context == null)
            {
                return;
            }

            context.rendererIndex =
                m_rendererDataCollection
                    .ResolveRendererIndexWithFallback(
                        ref rendererDataList,
                        ref defaultRendererIndex,
                        rendererIndex,
                        CreateDefaultRendererData);
        }
    }
}