asw-render-pipelines-universal/Runtime/NativeRenderPass.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Unity.Collections;
using UnityEngine.Experimental.Rendering;
using UnityEngine.Rendering;

namespace UnityEngine.Rendering.Universal
{
    public partial class ScriptableRenderer
    {
        private const int kRenderPassMapSize = 10;
        private const int kRenderPassMaxCount = 20;

        // used to keep track of the index of the last pass when we called BeginSubpass
        private int m_LastBeginSubpassPassIndex = 0;

        private Dictionary<Hash128, int[]> m_MergeableRenderPassesMap = new Dictionary<Hash128, int[]>(kRenderPassMapSize);
        // static array storing all the mergeableRenderPassesMap arrays. This is used to remove any GC allocs during the frame which would have been introduced by using a dynamic array to store the mergeablePasses per RenderPass
        private int[][] m_MergeableRenderPassesMapArrays;
        private Hash128[] m_PassIndexToPassHash = new Hash128[kRenderPassMaxCount];
        private Dictionary<Hash128, int> m_RenderPassesAttachmentCount = new Dictionary<Hash128, int>(kRenderPassMapSize);

        AttachmentDescriptor[] m_ActiveColorAttachmentDescriptors = new AttachmentDescriptor[]
        {
            RenderingUtils.emptyAttachment, RenderingUtils.emptyAttachment, RenderingUtils.emptyAttachment,
            RenderingUtils.emptyAttachment, RenderingUtils.emptyAttachment, RenderingUtils.emptyAttachment,
            RenderingUtils.emptyAttachment, RenderingUtils.emptyAttachment
        };
        AttachmentDescriptor m_ActiveDepthAttachmentDescriptor;

        bool[] m_IsActiveColorAttachmentTransient = new bool[]
        {
            false, false, false, false, false, false, false, false
        };

        internal RenderBufferStoreAction[] m_FinalColorStoreAction = new RenderBufferStoreAction[]
        {
            RenderBufferStoreAction.Store, RenderBufferStoreAction.Store, RenderBufferStoreAction.Store, RenderBufferStoreAction.Store,
            RenderBufferStoreAction.Store, RenderBufferStoreAction.Store, RenderBufferStoreAction.Store, RenderBufferStoreAction.Store
        };
        internal RenderBufferStoreAction m_FinalDepthStoreAction = RenderBufferStoreAction.Store;

        private static partial class Profiling
        {
            public static readonly ProfilingSampler setMRTAttachmentsList = new ProfilingSampler($"NativeRenderPass {nameof(SetNativeRenderPassMRTAttachmentList)}");
            public static readonly ProfilingSampler setAttachmentList = new ProfilingSampler($"NativeRenderPass {nameof(SetNativeRenderPassAttachmentList)}");
            public static readonly ProfilingSampler configure = new ProfilingSampler($"NativeRenderPass {nameof(ConfigureNativeRenderPass)}");
            public static readonly ProfilingSampler execute = new ProfilingSampler($"NativeRenderPass {nameof(ExecuteNativeRenderPass)}");
            public static readonly ProfilingSampler setupFrameData = new ProfilingSampler($"NativeRenderPass {nameof(SetupNativeRenderPassFrameData)}");
        }

        internal struct RenderPassDescriptor
        {
            internal int w, h, samples, depthID;

            internal RenderPassDescriptor(int width, int height, int sampleCount, int rtID)
            {
                w = width;
                h = height;
                samples = sampleCount;
                depthID = rtID;
            }
        }

        internal void ResetNativeRenderPassFrameData()
        {
            if (m_MergeableRenderPassesMapArrays == null)
                m_MergeableRenderPassesMapArrays = new int[kRenderPassMapSize][];

            for (int i = 0; i < kRenderPassMapSize; ++i)
            {
                if (m_MergeableRenderPassesMapArrays[i] == null)
                    m_MergeableRenderPassesMapArrays[i] = new int[kRenderPassMaxCount];

                for (int j = 0; j < kRenderPassMaxCount; ++j)
                {
                    m_MergeableRenderPassesMapArrays[i][j] = -1;
                }
            }
        }

        internal void SetupNativeRenderPassFrameData(CameraData cameraData, bool isRenderPassEnabled)
        {
            //TODO: edge cases to detect that should affect possible passes to merge
            // - total number of color attachment > 8

            // Go through all the passes and mark the final one as last pass

            using (new ProfilingScope(null, Profiling.setupFrameData))
            {
                int lastPassIndex = m_ActiveRenderPassQueue.Count - 1;

                // Make sure the list is already sorted!

                m_MergeableRenderPassesMap.Clear();
                m_RenderPassesAttachmentCount.Clear();
                uint currentHashIndex = 0;
                // reset all the passes last pass flag
                for (int i = 0; i < m_ActiveRenderPassQueue.Count; ++i)
                {
                    var renderPass = m_ActiveRenderPassQueue[i];

                    // Empty configure to setup dimensions/targets and whatever data is needed for merging
                    // We do not execute this at this time, so render targets are still invalid
                    var rpDesc = InitializeRenderPassDescriptor(cameraData, renderPass);

                    renderPass.isLastPass = false;
                    renderPass.renderPassQueueIndex = i;

                    bool RPEnabled = renderPass.useNativeRenderPass && isRenderPassEnabled;
                    if (!RPEnabled)
                        continue;

                    Hash128 hash = CreateRenderPassHash(rpDesc, currentHashIndex);

                    m_PassIndexToPassHash[i] = hash;

                    if (!m_MergeableRenderPassesMap.ContainsKey(hash))
                    {
                        m_MergeableRenderPassesMap.Add(hash, m_MergeableRenderPassesMapArrays[m_MergeableRenderPassesMap.Count]);
                        m_RenderPassesAttachmentCount.Add(hash, 0);
                    }
                    else if (m_MergeableRenderPassesMap[hash][GetValidPassIndexCount(m_MergeableRenderPassesMap[hash]) - 1] != (i - 1))
                    {
                        // if the passes are not sequential we want to split the current mergeable passes list. So we increment the hashIndex and update the hash

                        currentHashIndex++;
                        hash = CreateRenderPassHash(rpDesc, currentHashIndex);

                        m_PassIndexToPassHash[i] = hash;

                        m_MergeableRenderPassesMap.Add(hash, m_MergeableRenderPassesMapArrays[m_MergeableRenderPassesMap.Count]);
                        m_RenderPassesAttachmentCount.Add(hash, 0);
                    }

                    m_MergeableRenderPassesMap[hash][GetValidPassIndexCount(m_MergeableRenderPassesMap[hash])] = i;
                }

                m_ActiveRenderPassQueue[lastPassIndex].isLastPass = true;

                for (int i = 0; i < m_ActiveRenderPassQueue.Count; ++i)
                {
                    m_ActiveRenderPassQueue[i].m_ColorAttachmentIndices = new NativeArray<int>(8, Allocator.Temp);
                    m_ActiveRenderPassQueue[i].m_InputAttachmentIndices = new NativeArray<int>(8, Allocator.Temp);
                }
            }
        }

        internal void UpdateFinalStoreActions(int[] currentMergeablePasses, CameraData cameraData)
        {
            for (int i = 0; i < m_FinalColorStoreAction.Length; ++i)
                m_FinalColorStoreAction[i] = RenderBufferStoreAction.Store;
            m_FinalDepthStoreAction = RenderBufferStoreAction.Store;

            foreach (var passIdx in currentMergeablePasses)
            {
                if (!m_UseOptimizedStoreActions)
                    break;

                if (passIdx == -1)
                    break;

                ScriptableRenderPass pass = m_ActiveRenderPassQueue[passIdx];

                var samples = pass.renderTargetSampleCount != -1
                    ? pass.renderTargetSampleCount
                    : cameraData.cameraTargetDescriptor.msaaSamples;

                // only override existing non destructive actions
                for (int i = 0; i < m_FinalColorStoreAction.Length; ++i)
                {
                    if (m_FinalColorStoreAction[i] == RenderBufferStoreAction.Store || m_FinalColorStoreAction[i] == RenderBufferStoreAction.StoreAndResolve || pass.overriddenColorStoreActions[i])
                        m_FinalColorStoreAction[i] = pass.colorStoreActions[i];

                    if (samples > 1)
                    {
                        if (m_FinalColorStoreAction[i] == RenderBufferStoreAction.Store)
                            m_FinalColorStoreAction[i] = RenderBufferStoreAction.StoreAndResolve;
                        else if (m_FinalColorStoreAction[i] == RenderBufferStoreAction.DontCare)
                            m_FinalColorStoreAction[i] = RenderBufferStoreAction.Resolve;
                    }
                }

                // only override existing store
                if (m_FinalDepthStoreAction == RenderBufferStoreAction.Store || (m_FinalDepthStoreAction == RenderBufferStoreAction.StoreAndResolve && pass.depthStoreAction == RenderBufferStoreAction.Resolve) || pass.overriddenDepthStoreAction)
                    m_FinalDepthStoreAction = pass.depthStoreAction;
            }
        }

        internal void SetNativeRenderPassMRTAttachmentList(ScriptableRenderPass renderPass, ref CameraData cameraData, bool needCustomCameraColorClear, ClearFlag clearFlag)
        {
            using (new ProfilingScope(null, Profiling.setMRTAttachmentsList))
            {
                int currentPassIndex = renderPass.renderPassQueueIndex;
                Hash128 currentPassHash = m_PassIndexToPassHash[currentPassIndex];
                int[] currentMergeablePasses = m_MergeableRenderPassesMap[currentPassHash];

                // Not the first pass
                if (currentMergeablePasses.First() != currentPassIndex)
                    return;

                m_RenderPassesAttachmentCount[currentPassHash] = 0;

                UpdateFinalStoreActions(currentMergeablePasses, cameraData);

                int currentAttachmentIdx = 0;
                bool hasInput = false;
                foreach (var passIdx in currentMergeablePasses)
                {
                    if (passIdx == -1)
                        break;
                    ScriptableRenderPass pass = m_ActiveRenderPassQueue[passIdx];

                    for (int i = 0; i < pass.m_ColorAttachmentIndices.Length; ++i)
                        pass.m_ColorAttachmentIndices[i] = -1;

                    for (int i = 0; i < pass.m_InputAttachmentIndices.Length; ++i)
                        pass.m_InputAttachmentIndices[i] = -1;

                    uint validColorBuffersCount = RenderingUtils.GetValidColorBufferCount(pass.colorAttachments);

                    for (int i = 0; i < validColorBuffersCount; ++i)
                    {
                        AttachmentDescriptor currentAttachmentDescriptor =
                            new AttachmentDescriptor(pass.renderTargetFormat[i] != GraphicsFormat.None ? pass.renderTargetFormat[i] : GetDefaultGraphicsFormat(cameraData));

                        var colorTarget = pass.overrideCameraTarget ? pass.colorAttachments[i] : m_CameraColorTarget;
                        int existingAttachmentIndex = FindAttachmentDescriptorIndexInList(colorTarget, m_ActiveColorAttachmentDescriptors);

                        if (m_UseOptimizedStoreActions)
                            currentAttachmentDescriptor.storeAction = m_FinalColorStoreAction[i];

                        if (existingAttachmentIndex == -1)
                        {
                            // add a new attachment
                            m_ActiveColorAttachmentDescriptors[currentAttachmentIdx] = currentAttachmentDescriptor;
                            m_ActiveColorAttachmentDescriptors[currentAttachmentIdx].ConfigureTarget(colorTarget, (pass.clearFlag & ClearFlag.Color) == 0, true);

                            if (pass.colorAttachments[i] == m_CameraColorTarget && needCustomCameraColorClear && (clearFlag & ClearFlag.Color) != 0)
                                m_ActiveColorAttachmentDescriptors[currentAttachmentIdx].ConfigureClear(CoreUtils.ConvertSRGBToActiveColorSpace(cameraData.camera.backgroundColor), 1.0f, 0);
                            else if ((pass.clearFlag & ClearFlag.Color) != 0)
                                m_ActiveColorAttachmentDescriptors[currentAttachmentIdx].ConfigureClear(CoreUtils.ConvertSRGBToActiveColorSpace(pass.clearColor), 1.0f, 0);

                            pass.m_ColorAttachmentIndices[i] = currentAttachmentIdx;
                            currentAttachmentIdx++;
                            m_RenderPassesAttachmentCount[currentPassHash]++;
                        }
                        else
                        {
                            // attachment was already present
                            pass.m_ColorAttachmentIndices[i] = existingAttachmentIndex;
                        }
                    }

                    if (PassHasInputAttachments(pass))
                    {
                        hasInput = true;
                        SetupInputAttachmentIndices(pass);
                    }

                    // TODO: this is redundant and is being setup for each attachment. Needs to be done only once per mergeable pass list (we need to make sure mergeable passes use the same depth!)
                    m_ActiveDepthAttachmentDescriptor = new AttachmentDescriptor(SystemInfo.GetGraphicsFormat(DefaultFormat.DepthStencil));
                    m_ActiveDepthAttachmentDescriptor.ConfigureTarget(pass.overrideCameraTarget ? pass.depthAttachment : m_CameraDepthTarget, (clearFlag & ClearFlag.DepthStencil) == 0, true);

                    if ((clearFlag & ClearFlag.DepthStencil) != 0)
                        m_ActiveDepthAttachmentDescriptor.ConfigureClear(Color.black, 1.0f, 0);

                    if (m_UseOptimizedStoreActions)
                        m_ActiveDepthAttachmentDescriptor.storeAction = m_FinalDepthStoreAction;
                }
                if (hasInput)
                    SetupTransientInputAttachments(m_RenderPassesAttachmentCount[currentPassHash]);
            }
        }

        bool IsDepthOnlyRenderTexture(RenderTexture t)
        {
            if (t.graphicsFormat == GraphicsFormat.None ||
#pragma warning disable 0618 // Disable deprecation warnings. If you get here once these formats are really gone, the code in this #pragma can simply be removed
                t.graphicsFormat == GraphicsFormat.DepthAuto ||
                t.graphicsFormat == GraphicsFormat.ShadowAuto
#pragma warning restore 0618
            )
            {
                return true;
            }
            return false;
        }

        internal void SetNativeRenderPassAttachmentList(ScriptableRenderPass renderPass, ref CameraData cameraData, RenderTargetIdentifier passColorAttachment, RenderTargetIdentifier passDepthAttachment, ClearFlag finalClearFlag, Color finalClearColor)
        {
            using (new ProfilingScope(null, Profiling.setAttachmentList))
            {
                int currentPassIndex = renderPass.renderPassQueueIndex;
                Hash128 currentPassHash = m_PassIndexToPassHash[currentPassIndex];
                int[] currentMergeablePasses = m_MergeableRenderPassesMap[currentPassHash];

                // Skip if not the first pass
                if (currentMergeablePasses.First() != currentPassIndex)
                    return;

                m_RenderPassesAttachmentCount[currentPassHash] = 0;

                UpdateFinalStoreActions(currentMergeablePasses, cameraData);

                int currentAttachmentIdx = 0;
                foreach (var passIdx in currentMergeablePasses)
                {
                    if (passIdx == -1)
                        break;
                    ScriptableRenderPass pass = m_ActiveRenderPassQueue[passIdx];

                    for (int i = 0; i < pass.m_ColorAttachmentIndices.Length; ++i)
                        pass.m_ColorAttachmentIndices[i] = -1;

                    AttachmentDescriptor currentAttachmentDescriptor;
                    var usesTargetTexture = cameraData.targetTexture != null;
                    var depthOnly = renderPass.depthOnly || (usesTargetTexture && IsDepthOnlyRenderTexture(cameraData.targetTexture));
                    // Offscreen depth-only cameras need this set explicitly
                    if (depthOnly && usesTargetTexture)
                    {
                        if (IsDepthOnlyRenderTexture(cameraData.targetTexture) && !pass.overrideCameraTarget)
                            passColorAttachment = new RenderTargetIdentifier(cameraData.targetTexture);
                        else
                            passColorAttachment = renderPass.colorAttachment;
                        currentAttachmentDescriptor = new AttachmentDescriptor(SystemInfo.GetGraphicsFormat(DefaultFormat.DepthStencil));
                    }
                    else
                        currentAttachmentDescriptor =
                            new AttachmentDescriptor(cameraData.cameraTargetDescriptor.graphicsFormat);

                    if (pass.overrideCameraTarget)
                        currentAttachmentDescriptor = new AttachmentDescriptor(pass.renderTargetFormat[0] != GraphicsFormat.None ? pass.renderTargetFormat[0] : GetDefaultGraphicsFormat(cameraData));

                    var samples = pass.renderTargetSampleCount != -1
                        ? pass.renderTargetSampleCount
                        : cameraData.cameraTargetDescriptor.msaaSamples;

                    var colorAttachmentTarget =
                        (depthOnly || passColorAttachment != BuiltinRenderTextureType.CameraTarget)
                        ? passColorAttachment : (usesTargetTexture
                            ? new RenderTargetIdentifier(cameraData.targetTexture.colorBuffer)
                            : BuiltinRenderTextureType.CameraTarget);

                    var depthAttachmentTarget = (passDepthAttachment != BuiltinRenderTextureType.CameraTarget) ?
                        passDepthAttachment : (usesTargetTexture
                            ? new RenderTargetIdentifier(cameraData.targetTexture.depthBuffer)
                            : BuiltinRenderTextureType.Depth);

                    currentAttachmentDescriptor.ConfigureTarget(colorAttachmentTarget, ((uint)finalClearFlag & (uint)ClearFlag.Color) == 0, true);

                    if (PassHasInputAttachments(pass))
                        SetupInputAttachmentIndices(pass);

                    // TODO: this is redundant and is being setup for each attachment. Needs to be done only once per mergeable pass list (we need to make sure mergeable passes use the same depth!)
                    m_ActiveDepthAttachmentDescriptor = new AttachmentDescriptor(SystemInfo.GetGraphicsFormat(DefaultFormat.DepthStencil));
                    m_ActiveDepthAttachmentDescriptor.ConfigureTarget(depthAttachmentTarget,
                        ((uint)finalClearFlag & (uint)ClearFlag.Depth) == 0, true);

                    if (finalClearFlag != ClearFlag.None)
                    {
                        // We don't clear color for Overlay render targets, however pipeline set's up depth only render passes as color attachments which we do need to clear
                        if ((cameraData.renderType != CameraRenderType.Overlay || depthOnly && ((uint)finalClearFlag & (uint)ClearFlag.Color) != 0))
                            currentAttachmentDescriptor.ConfigureClear(finalClearColor, 1.0f, 0);
                        if (((uint)finalClearFlag & (uint)ClearFlag.Depth) != 0)
                            m_ActiveDepthAttachmentDescriptor.ConfigureClear(Color.black, 1.0f, 0);
                    }

                    // resolving to the implicit color target's resolve surface TODO: handle m_CameraResolveTarget if present?
                    if (samples > 1)
                        currentAttachmentDescriptor.ConfigureResolveTarget(colorAttachmentTarget);

                    if (m_UseOptimizedStoreActions)
                    {
                        currentAttachmentDescriptor.storeAction = m_FinalColorStoreAction[0];
                        m_ActiveDepthAttachmentDescriptor.storeAction = m_FinalDepthStoreAction;
                    }

                    int existingAttachmentIndex = FindAttachmentDescriptorIndexInList(currentAttachmentIdx,
                        currentAttachmentDescriptor, m_ActiveColorAttachmentDescriptors);

                    if (existingAttachmentIndex == -1)
                    {
                        // add a new attachment
                        pass.m_ColorAttachmentIndices[0] = currentAttachmentIdx;
                        m_ActiveColorAttachmentDescriptors[currentAttachmentIdx] = currentAttachmentDescriptor;
                        currentAttachmentIdx++;
                        m_RenderPassesAttachmentCount[currentPassHash]++;
                    }
                    else
                    {
                        // attachment was already present
                        pass.m_ColorAttachmentIndices[0] = existingAttachmentIndex;
                    }
                }
            }
        }

        internal void ConfigureNativeRenderPass(CommandBuffer cmd, ScriptableRenderPass renderPass, CameraData cameraData)
        {
            using (new ProfilingScope(null, Profiling.configure))
            {
                int currentPassIndex = renderPass.renderPassQueueIndex;
                Hash128 currentPassHash = m_PassIndexToPassHash[currentPassIndex];
                int[] currentMergeablePasses = m_MergeableRenderPassesMap[currentPassHash];

                // If it's the first pass, configure the whole merge block
                if (currentMergeablePasses.First() == currentPassIndex)
                {
                    foreach (var passIdx in currentMergeablePasses)
                    {
                        if (passIdx == -1)
                            break;
                        ScriptableRenderPass pass = m_ActiveRenderPassQueue[passIdx];
                        pass.Configure(cmd, cameraData.cameraTargetDescriptor);
                    }
                }
            }
        }

        internal void ExecuteNativeRenderPass(ScriptableRenderContext context, ScriptableRenderPass renderPass, CameraData cameraData, ref RenderingData renderingData)
        {
            using (new ProfilingScope(null, Profiling.execute))
            {
                int currentPassIndex = renderPass.renderPassQueueIndex;
                Hash128 currentPassHash = m_PassIndexToPassHash[currentPassIndex];
                int[] currentMergeablePasses = m_MergeableRenderPassesMap[currentPassHash];

                int validColorBuffersCount = m_RenderPassesAttachmentCount[currentPassHash];

                bool isLastPass = renderPass.isLastPass;
                // TODO: review the lastPassToBB logic to mak it work with merged passes
                // keep track if this is the current camera's last pass and the RT is the backbuffer (BuiltinRenderTextureType.CameraTarget)
                bool isLastPassToBB = isLastPass && (m_ActiveColorAttachmentDescriptors[0].loadStoreTarget ==
                    BuiltinRenderTextureType.CameraTarget);
                var depthOnly = renderPass.depthOnly || (cameraData.targetTexture != null && IsDepthOnlyRenderTexture(cameraData.targetTexture));
                bool useDepth = depthOnly || (!renderPass.overrideCameraTarget || (renderPass.overrideCameraTarget && renderPass.depthAttachment != BuiltinRenderTextureType.CameraTarget)) &&
                    (!(isLastPassToBB || (isLastPass && cameraData.camera.targetTexture != null)));

                var attachments =
                    new NativeArray<AttachmentDescriptor>(useDepth && !depthOnly ? validColorBuffersCount + 1 : 1,
                        Allocator.Temp);

                for (int i = 0; i < validColorBuffersCount; ++i)
                    attachments[i] = m_ActiveColorAttachmentDescriptors[i];

                if (useDepth && !depthOnly)
                    attachments[validColorBuffersCount] = m_ActiveDepthAttachmentDescriptor;

                var rpDesc = InitializeRenderPassDescriptor(cameraData, renderPass);

                int validPassCount = GetValidPassIndexCount(currentMergeablePasses);

                var attachmentIndicesCount = GetSubPassAttachmentIndicesCount(renderPass);

                var attachmentIndices = new NativeArray<int>(!depthOnly ? (int)attachmentIndicesCount : 0, Allocator.Temp);
                if (!depthOnly)
                {
                    for (int i = 0; i < attachmentIndicesCount; ++i)
                    {
                        attachmentIndices[i] = renderPass.m_ColorAttachmentIndices[i];
                    }
                }

                if (validPassCount == 1 || currentMergeablePasses[0] == currentPassIndex) // Check if it's the first pass
                {
                    if (PassHasInputAttachments(renderPass))
                        Debug.LogWarning("First pass in a RenderPass should not have input attachments.");

                    context.BeginRenderPass(rpDesc.w, rpDesc.h, Math.Max(rpDesc.samples, 1), attachments,
                        useDepth ? (!depthOnly ? validColorBuffersCount : 0) : -1);
                    attachments.Dispose();

                    context.BeginSubPass(attachmentIndices);

                    m_LastBeginSubpassPassIndex = currentPassIndex;
                }
                else
                {
                    // Regarding input attachments, currently we always recreate a new subpass if it contains input attachments
                    // This might not the most optimal way though and it should be investigated in the future
                    // Whether merging subpasses with matching input attachments is a more viable option
                    if (!AreAttachmentIndicesCompatible(m_ActiveRenderPassQueue[m_LastBeginSubpassPassIndex], m_ActiveRenderPassQueue[currentPassIndex]))
                    {
                        context.EndSubPass();
                        if (PassHasInputAttachments(m_ActiveRenderPassQueue[currentPassIndex]))
                            context.BeginSubPass(attachmentIndices, m_ActiveRenderPassQueue[currentPassIndex].m_InputAttachmentIndices);
                        else
                            context.BeginSubPass(attachmentIndices);

                        m_LastBeginSubpassPassIndex = currentPassIndex;
                    }
                    else if (PassHasInputAttachments(m_ActiveRenderPassQueue[currentPassIndex]))
                    {
                        context.EndSubPass();
                        context.BeginSubPass(attachmentIndices, m_ActiveRenderPassQueue[currentPassIndex].m_InputAttachmentIndices);

                        m_LastBeginSubpassPassIndex = currentPassIndex;
                    }
                }

                attachmentIndices.Dispose();

                renderPass.Execute(context, ref renderingData);

                if (validPassCount == 1 || currentMergeablePasses[validPassCount - 1] == currentPassIndex) // Check if it's the last pass
                {
                    context.EndSubPass();
                    context.EndRenderPass();

                    m_LastBeginSubpassPassIndex = 0;
                }

                for (int i = 0; i < m_ActiveColorAttachmentDescriptors.Length; ++i)
                {
                    m_ActiveColorAttachmentDescriptors[i] = RenderingUtils.emptyAttachment;
                    m_IsActiveColorAttachmentTransient[i] = false;
                }

                m_ActiveDepthAttachmentDescriptor = RenderingUtils.emptyAttachment;
            }
        }

        internal void SetupInputAttachmentIndices(ScriptableRenderPass pass)
        {
            var validInputBufferCount = GetValidInputAttachmentCount(pass);
            pass.m_InputAttachmentIndices = new NativeArray<int>(validInputBufferCount, Allocator.Temp);
            for (int i = 0; i < validInputBufferCount; i++)
            {
                pass.m_InputAttachmentIndices[i] = FindAttachmentDescriptorIndexInList(pass.m_InputAttachments[i], m_ActiveColorAttachmentDescriptors);
                if (pass.m_InputAttachmentIndices[i] == -1)
                {
                    Debug.LogWarning("RenderPass Input attachment not found in the current RenderPass");
                    continue;
                }

                // Only update it as long as it has default value - if it was changed once, we assume it'll be memoryless in the whole RenderPass
                if (!m_IsActiveColorAttachmentTransient[pass.m_InputAttachmentIndices[i]])
                    m_IsActiveColorAttachmentTransient[pass.m_InputAttachmentIndices[i]] = pass.IsInputAttachmentTransient(i);
            }
        }

        internal void SetupTransientInputAttachments(int attachmentCount)
        {
            for (int i = 0; i < attachmentCount; ++i)
            {
                if (!m_IsActiveColorAttachmentTransient[i])
                    continue;

                m_ActiveColorAttachmentDescriptors[i].loadAction = RenderBufferLoadAction.DontCare;
                m_ActiveColorAttachmentDescriptors[i].storeAction = RenderBufferStoreAction.DontCare;
                // We change the target of the descriptor for it to be initialized engine-side as a transient resource.
                m_ActiveColorAttachmentDescriptors[i].loadStoreTarget = BuiltinRenderTextureType.None;
            }
        }

        internal static uint GetSubPassAttachmentIndicesCount(ScriptableRenderPass pass)
        {
            uint numValidAttachments = 0;

            foreach (var attIdx in pass.m_ColorAttachmentIndices)
            {
                if (attIdx >= 0)
                    ++numValidAttachments;
            }

            return numValidAttachments;
        }

        internal static bool AreAttachmentIndicesCompatible(ScriptableRenderPass lastSubPass, ScriptableRenderPass currentSubPass)
        {
            uint lastSubPassAttCount = GetSubPassAttachmentIndicesCount(lastSubPass);
            uint currentSubPassAttCount = GetSubPassAttachmentIndicesCount(currentSubPass);

            if (currentSubPassAttCount > lastSubPassAttCount)
                return false;

            uint numEqualAttachments = 0;
            for (int currPassIdx = 0; currPassIdx < currentSubPassAttCount; ++currPassIdx)
            {
                for (int lastPassIdx = 0; lastPassIdx < lastSubPassAttCount; ++lastPassIdx)
                {
                    if (currentSubPass.m_ColorAttachmentIndices[currPassIdx] == lastSubPass.m_ColorAttachmentIndices[lastPassIdx])
                        numEqualAttachments++;
                }
            }

            return (numEqualAttachments == currentSubPassAttCount);
        }

        internal static uint GetValidColorAttachmentCount(AttachmentDescriptor[] colorAttachments)
        {
            uint nonNullColorBuffers = 0;
            if (colorAttachments != null)
            {
                foreach (var attachment in colorAttachments)
                {
                    if (attachment != RenderingUtils.emptyAttachment)
                        ++nonNullColorBuffers;
                }
            }
            return nonNullColorBuffers;
        }

        internal static int GetValidInputAttachmentCount(ScriptableRenderPass renderPass)
        {
            var length = renderPass.m_InputAttachments.Length;
            if (length != 8) // overriden, there are attachments
                return length;
            else
            {
                for (int i = 0; i < length; ++i)
                {
                    if (renderPass.m_InputAttachments[i] == -1)
                        return i;
                }
                return length;
            }
        }

        internal static int FindAttachmentDescriptorIndexInList(int attachmentIdx, AttachmentDescriptor attachmentDescriptor, AttachmentDescriptor[] attachmentDescriptors)
        {
            int existingAttachmentIndex = -1;
            for (int i = 0; i <= attachmentIdx; ++i)
            {
                AttachmentDescriptor att = attachmentDescriptors[i];

                if (att.loadStoreTarget == attachmentDescriptor.loadStoreTarget && att.graphicsFormat == attachmentDescriptor.graphicsFormat)
                {
                    existingAttachmentIndex = i;
                    break;
                }
            }

            return existingAttachmentIndex;
        }

        internal static int FindAttachmentDescriptorIndexInList(RenderTargetIdentifier target, AttachmentDescriptor[] attachmentDescriptors)
        {
            for (int i = 0; i < attachmentDescriptors.Length; i++)
            {
                AttachmentDescriptor att = attachmentDescriptors[i];
                if (att.loadStoreTarget == target)
                    return i;
            }

            return -1;
        }

        internal static int GetValidPassIndexCount(int[] array)
        {
            if (array == null)
                return 0;

            for (int i = 0; i < array.Length; ++i)
            {
                if (array[i] == -1)
                    return i;
            }
            return array.Length - 1;
        }

        internal static bool PassHasInputAttachments(ScriptableRenderPass renderPass)
        {
            return renderPass.m_InputAttachments.Length != 8 || renderPass.m_InputAttachments[0] != -1;
        }

        internal static Hash128 CreateRenderPassHash(int width, int height, int depthID, int sample, uint hashIndex)
        {
            return new Hash128((uint)(width << 4) + (uint)height, (uint)depthID, (uint)sample, hashIndex);
        }

        internal static Hash128 CreateRenderPassHash(RenderPassDescriptor desc, uint hashIndex)
        {
            return CreateRenderPassHash(desc.w, desc.h, desc.depthID, desc.samples, hashIndex);
        }

        private RenderPassDescriptor InitializeRenderPassDescriptor(CameraData cameraData, ScriptableRenderPass renderPass)
        {
            var w = (renderPass.renderTargetWidth != -1) ? renderPass.renderTargetWidth : cameraData.cameraTargetDescriptor.width;
            var h = (renderPass.renderTargetHeight != -1) ? renderPass.renderTargetHeight : cameraData.cameraTargetDescriptor.height;
            var samples = (renderPass.renderTargetSampleCount != -1) ? renderPass.renderTargetSampleCount : cameraData.cameraTargetDescriptor.msaaSamples;
            var depthTarget = renderPass.overrideCameraTarget ? renderPass.depthAttachment : m_CameraDepthTarget;
            var depthID = renderPass.depthOnly ? renderPass.colorAttachment.GetHashCode() : depthTarget.GetHashCode();
            return new RenderPassDescriptor(w, h, samples, depthID);
        }

        private static GraphicsFormat GetDefaultGraphicsFormat(CameraData cameraData)
        {
            if (cameraData.isHdrEnabled)
            {
                GraphicsFormat hdrFormat = GraphicsFormat.None;

                if (!Graphics.preserveFramebufferAlpha &&
                    RenderingUtils.SupportsGraphicsFormat(GraphicsFormat.B10G11R11_UFloatPack32,
                        FormatUsage.Linear | FormatUsage.Render))
                    hdrFormat = GraphicsFormat.B10G11R11_UFloatPack32;
                else if (RenderingUtils.SupportsGraphicsFormat(GraphicsFormat.R16G16B16A16_SFloat,
                    FormatUsage.Linear | FormatUsage.Render))
                    hdrFormat = GraphicsFormat.R16G16B16A16_SFloat;
                else
                    hdrFormat = SystemInfo.GetGraphicsFormat(DefaultFormat.HDR);

                return hdrFormat;
            }

            return SystemInfo.GetGraphicsFormat(DefaultFormat.LDR);
        }
    }
}