/* Copyright (c) 2015-2016 The Khronos Group Inc.
 * Copyright (c) 2015-2016 Valve Corporation
 * Copyright (c) 2015-2016 LunarG, Inc.
 * Copyright (C) 2015-2016 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Author: Tobin Ehlis <tobine@google.com>
 *         John Zulauf <jzulauf@lunarg.com>
 */
#ifndef CORE_VALIDATION_DESCRIPTOR_SETS_H_
#define CORE_VALIDATION_DESCRIPTOR_SETS_H_

#include "core_validation_error_enums.h"
#include "vk_validation_error_messages.h"
#include "core_validation_types.h"
#include "vk_layer_logging.h"
#include "vk_layer_utils.h"
#include "vk_safe_struct.h"
#include "vulkan/vk_layer.h"
#include "vk_object_types.h"
#include <map>
#include <memory>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <vector>

using core_validation::layer_data;

// Descriptor Data structures
namespace cvdescriptorset {

// Utility structs/classes/types
// Index range for global indices below, end is exclusive, i.e. [start,end)
struct IndexRange {
    IndexRange(uint32_t start_in, uint32_t end_in) : start(start_in), end(end_in) {}
    IndexRange() = default;
    uint32_t start;
    uint32_t end;
};
typedef std::map<uint32_t, descriptor_req> BindingReqMap;

/*
 * DescriptorSetLayout class
 *
 * Overview - This class encapsulates the Vulkan VkDescriptorSetLayout data (layout).
 *   A layout consists of some number of bindings, each of which has a binding#, a
 *   type, descriptor count, stage flags, and pImmutableSamplers.
 *
 * Index vs Binding - A layout is created with an array of VkDescriptorSetLayoutBinding
 *  where each array index will have a corresponding binding# that is defined in that struct.
 *  The binding#, then, is decoupled from VkDescriptorSetLayoutBinding index, which allows
 *  bindings to be defined out-of-order. This DescriptorSetLayout class, however, stores
 *  the bindings internally in-order. This is useful for operations which may "roll over"
 *  from a single binding to the next consecutive binding.
 *
 *  Note that although the bindings are stored in-order, there still may be "gaps" in the
 *  binding#. For example, if the binding creation order is 8, 7, 10, 3, 4, then the
 *  internal binding array will have five entries stored in binding order 3, 4, 7, 8, 10.
 *  To process all of the bindings in a layout you can iterate from 0 to GetBindingCount()
 *  and use the Get*FromIndex() functions for each index. To just process a single binding,
 *  use the Get*FromBinding() functions.
 *
 * Global Index - The binding vector index has as many indices as there are bindings.
 *  This class also has the concept of a Global Index. For the global index functions,
 *  there are as many global indices as there are descriptors in the layout.
 *  For the global index, consider all of the bindings to be a flat array where
 *  descriptor 0 of of the lowest binding# is index 0 and each descriptor in the layout
 *  increments from there. So if the lowest binding# in this example had descriptorCount of
 *  10, then the GlobalStartIndex of the 2nd lowest binding# will be 10 where 0-9 are the
 *  global indices for the lowest binding#.
 */
class DescriptorSetLayout {
   public:
    // Constructors and destructor
    DescriptorSetLayout(const VkDescriptorSetLayoutCreateInfo *p_create_info, const VkDescriptorSetLayout layout);
    // Validate create info - should be called prior to creation
    static bool ValidateCreateInfo(const debug_report_data *, const VkDescriptorSetLayoutCreateInfo *, const bool, const uint32_t);
    // Straightforward Get functions
    VkDescriptorSetLayout GetDescriptorSetLayout() const { return layout_; };
    bool IsDestroyed() const { return layout_destroyed_; }
    void MarkDestroyed() { layout_destroyed_ = true; }
    uint32_t GetTotalDescriptorCount() const { return descriptor_count_; };
    uint32_t GetDynamicDescriptorCount() const { return dynamic_descriptor_count_; };
    VkDescriptorSetLayoutCreateFlags GetCreateFlags() const { return flags_; }
    // For a given binding, return the number of descriptors in that binding and all successive bindings
    uint32_t GetBindingCount() const { return binding_count_; };
    // Non-empty binding numbers in order
    const std::set<uint32_t> &GetSortedBindingSet() const { return non_empty_bindings_; }
    // Return true if given binding is present in this layout
    bool HasBinding(const uint32_t binding) const { return binding_to_index_map_.count(binding) > 0; };
    // Return true if this layout is compatible with passed in layout from a pipelineLayout,
    //   else return false and update error_msg with description of incompatibility
    bool IsCompatible(DescriptorSetLayout const *const, std::string *) const;
    // Return true if binding 1 beyond given exists and has same type, stageFlags & immutable sampler use
    bool IsNextBindingConsistent(const uint32_t) const;
    uint32_t GetIndexFromBinding(uint32_t binding) const;
    // Various Get functions that can either be passed a binding#, which will
    //  be automatically translated into the appropriate index, or the index# can be passed in directly
    uint32_t GetMaxBinding() const { return bindings_[bindings_.size() - 1].binding; }
    VkDescriptorSetLayoutBinding const *GetDescriptorSetLayoutBindingPtrFromIndex(const uint32_t) const;
    VkDescriptorSetLayoutBinding const *GetDescriptorSetLayoutBindingPtrFromBinding(uint32_t binding) const {
        return GetDescriptorSetLayoutBindingPtrFromIndex(GetIndexFromBinding(binding));
    }
    uint32_t GetDescriptorCountFromIndex(const uint32_t) const;
    uint32_t GetDescriptorCountFromBinding(const uint32_t binding) const {
        return GetDescriptorCountFromIndex(GetIndexFromBinding(binding));
    }
    VkDescriptorType GetTypeFromIndex(const uint32_t) const;
    VkDescriptorType GetTypeFromBinding(const uint32_t binding) const { return GetTypeFromIndex(GetIndexFromBinding(binding)); }
    VkShaderStageFlags GetStageFlagsFromIndex(const uint32_t) const;
    VkShaderStageFlags GetStageFlagsFromBinding(const uint32_t binding) const {
        return GetStageFlagsFromIndex(GetIndexFromBinding(binding));
    }
    uint32_t GetIndexFromGlobalIndex(const uint32_t global_index) const;
    VkDescriptorType GetTypeFromGlobalIndex(const uint32_t global_index) const {
        return GetTypeFromIndex(GetIndexFromGlobalIndex(global_index));
    }
    VkSampler const *GetImmutableSamplerPtrFromBinding(const uint32_t) const;
    VkSampler const *GetImmutableSamplerPtrFromIndex(const uint32_t) const;
    // For a given binding and array index, return the corresponding index into the dynamic offset array
    int32_t GetDynamicOffsetIndexFromBinding(uint32_t binding) const {
        auto dyn_off = binding_to_dynamic_array_idx_map_.find(binding);
        if (dyn_off == binding_to_dynamic_array_idx_map_.end()) {
            assert(0);  // Requesting dyn offset for invalid binding/array idx pair
            return -1;
        }
        return dyn_off->second;
    }
    // For a particular binding, get the global index range
    //  This call should be guarded by a call to "HasBinding(binding)" to verify that the given binding exists
    const IndexRange &GetGlobalIndexRangeFromBinding(const uint32_t) const;

    // Helper function to get the next valid binding for a descriptor
    uint32_t GetNextValidBinding(const uint32_t) const;
    // For a particular binding starting at offset and having update_count descriptors
    //  updated, verify that for any binding boundaries crossed, the update is consistent
    bool VerifyUpdateConsistency(uint32_t, uint32_t, uint32_t, const char *, const VkDescriptorSet, std::string *) const;
    bool IsPushDescriptor() const { return GetCreateFlags() & VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR; };

    struct BindingTypeStats {
        uint32_t dynamic_buffer_count;
        uint32_t non_dynamic_buffer_count;
        uint32_t image_sampler_count;
    };
    const BindingTypeStats &GetBindingTypeStats() const { return binding_type_stats_; }

   private:
    VkDescriptorSetLayout layout_;
    bool layout_destroyed_;
    std::set<uint32_t> non_empty_bindings_;  // Containing non-emtpy bindings in numerical order
    std::unordered_map<uint32_t, uint32_t> binding_to_index_map_;
    // The following map allows an non-iterative lookup of a binding from a global index...
    std::map<uint32_t, uint32_t> global_start_to_index_map_;  // The index corresponding for a starting global (descriptor) index
    std::unordered_map<uint32_t, IndexRange> binding_to_global_index_range_map_;  // range is exclusive of .end
    // For a given binding map to associated index in the dynamic offset array
    std::unordered_map<uint32_t, uint32_t> binding_to_dynamic_array_idx_map_;
    VkDescriptorSetLayoutCreateFlags flags_;
    uint32_t binding_count_;  // # of bindings in this layout
    std::vector<safe_VkDescriptorSetLayoutBinding> bindings_;
    uint32_t descriptor_count_;  // total # descriptors in this layout
    uint32_t dynamic_descriptor_count_;
    BindingTypeStats binding_type_stats_;
};

/*
 * Descriptor classes
 *  Descriptor is an abstract base class from which 5 separate descriptor types are derived.
 *   This allows the WriteUpdate() and CopyUpdate() operations to be specialized per
 *   descriptor type, but all descriptors in a set can be accessed via the common Descriptor*.
 */

// Slightly broader than type, each c++ "class" will has a corresponding "DescriptorClass"
enum DescriptorClass { PlainSampler, ImageSampler, Image, TexelBuffer, GeneralBuffer };

class Descriptor {
   public:
    virtual ~Descriptor(){};
    virtual void WriteUpdate(const VkWriteDescriptorSet *, const uint32_t) = 0;
    virtual void CopyUpdate(const Descriptor *) = 0;
    // Create binding between resources of this descriptor and given cb_node
    virtual void BindCommandBuffer(const core_validation::layer_data *, GLOBAL_CB_NODE *) = 0;
    virtual DescriptorClass GetClass() const { return descriptor_class; };
    // Special fast-path check for SamplerDescriptors that are immutable
    virtual bool IsImmutableSampler() const { return false; };
    // Check for dynamic descriptor type
    virtual bool IsDynamic() const { return false; };
    // Check for storage descriptor type
    virtual bool IsStorage() const { return false; };
    bool updated;  // Has descriptor been updated?
    DescriptorClass descriptor_class;
};
// Shared helper functions - These are useful because the shared sampler image descriptor type
//  performs common functions with both sampler and image descriptors so they can share their common functions
bool ValidateSampler(const VkSampler, const core_validation::layer_data *);
bool ValidateImageUpdate(VkImageView, VkImageLayout, VkDescriptorType, const core_validation::layer_data *,
                         UNIQUE_VALIDATION_ERROR_CODE *, std::string *);

class SamplerDescriptor : public Descriptor {
   public:
    SamplerDescriptor(const VkSampler *);
    void WriteUpdate(const VkWriteDescriptorSet *, const uint32_t) override;
    void CopyUpdate(const Descriptor *) override;
    void BindCommandBuffer(const core_validation::layer_data *, GLOBAL_CB_NODE *) override;
    virtual bool IsImmutableSampler() const override { return immutable_; };
    VkSampler GetSampler() const { return sampler_; }

   private:
    // bool ValidateSampler(const VkSampler) const;
    VkSampler sampler_;
    bool immutable_;
};

class ImageSamplerDescriptor : public Descriptor {
   public:
    ImageSamplerDescriptor(const VkSampler *);
    void WriteUpdate(const VkWriteDescriptorSet *, const uint32_t) override;
    void CopyUpdate(const Descriptor *) override;
    void BindCommandBuffer(const core_validation::layer_data *, GLOBAL_CB_NODE *) override;
    virtual bool IsImmutableSampler() const override { return immutable_; };
    VkSampler GetSampler() const { return sampler_; }
    VkImageView GetImageView() const { return image_view_; }
    VkImageLayout GetImageLayout() const { return image_layout_; }

   private:
    VkSampler sampler_;
    bool immutable_;
    VkImageView image_view_;
    VkImageLayout image_layout_;
};

class ImageDescriptor : public Descriptor {
   public:
    ImageDescriptor(const VkDescriptorType);
    void WriteUpdate(const VkWriteDescriptorSet *, const uint32_t) override;
    void CopyUpdate(const Descriptor *) override;
    void BindCommandBuffer(const core_validation::layer_data *, GLOBAL_CB_NODE *) override;
    virtual bool IsStorage() const override { return storage_; }
    VkImageView GetImageView() const { return image_view_; }
    VkImageLayout GetImageLayout() const { return image_layout_; }

   private:
    bool storage_;
    VkImageView image_view_;
    VkImageLayout image_layout_;
};

class TexelDescriptor : public Descriptor {
   public:
    TexelDescriptor(const VkDescriptorType);
    void WriteUpdate(const VkWriteDescriptorSet *, const uint32_t) override;
    void CopyUpdate(const Descriptor *) override;
    void BindCommandBuffer(const core_validation::layer_data *, GLOBAL_CB_NODE *) override;
    virtual bool IsStorage() const override { return storage_; }
    VkBufferView GetBufferView() const { return buffer_view_; }

   private:
    VkBufferView buffer_view_;
    bool storage_;
};

class BufferDescriptor : public Descriptor {
   public:
    BufferDescriptor(const VkDescriptorType);
    void WriteUpdate(const VkWriteDescriptorSet *, const uint32_t) override;
    void CopyUpdate(const Descriptor *) override;
    void BindCommandBuffer(const core_validation::layer_data *, GLOBAL_CB_NODE *) override;
    virtual bool IsDynamic() const override { return dynamic_; }
    virtual bool IsStorage() const override { return storage_; }
    VkBuffer GetBuffer() const { return buffer_; }
    VkDeviceSize GetOffset() const { return offset_; }
    VkDeviceSize GetRange() const { return range_; }

   private:
    bool storage_;
    bool dynamic_;
    VkBuffer buffer_;
    VkDeviceSize offset_;
    VkDeviceSize range_;
};
// Structs to contain common elements that need to be shared between Validate* and Perform* calls below
struct AllocateDescriptorSetsData {
    uint32_t required_descriptors_by_type[VK_DESCRIPTOR_TYPE_RANGE_SIZE];
    std::vector<std::shared_ptr<DescriptorSetLayout const>> layout_nodes;
    AllocateDescriptorSetsData(uint32_t);
};
// Helper functions for descriptor set functions that cross multiple sets
// "Validate" will make sure an update is ok without actually performing it
bool ValidateUpdateDescriptorSets(const debug_report_data *, const core_validation::layer_data *, uint32_t,
                                  const VkWriteDescriptorSet *, uint32_t, const VkCopyDescriptorSet *);
// "Perform" does the update with the assumption that ValidateUpdateDescriptorSets() has passed for the given update
void PerformUpdateDescriptorSets(const core_validation::layer_data *, uint32_t, const VkWriteDescriptorSet *, uint32_t,
                                 const VkCopyDescriptorSet *);
// Similar to PerformUpdateDescriptorSets, this function will do the same for updating via templates
void PerformUpdateDescriptorSetsWithTemplateKHR(layer_data *, VkDescriptorSet, std::unique_ptr<TEMPLATE_STATE> const &,
                                                const void *);
// Update the common AllocateDescriptorSetsData struct which can then be shared between Validate* and Perform* funcs below
void UpdateAllocateDescriptorSetsData(const layer_data *dev_data, const VkDescriptorSetAllocateInfo *,
                                      AllocateDescriptorSetsData *);
// Validate that Allocation state is ok
bool ValidateAllocateDescriptorSets(const core_validation::layer_data *, const VkDescriptorSetAllocateInfo *,
                                    const AllocateDescriptorSetsData *);
// Update state based on allocating new descriptorsets
void PerformAllocateDescriptorSets(const VkDescriptorSetAllocateInfo *, const VkDescriptorSet *, const AllocateDescriptorSetsData *,
                                   std::unordered_map<VkDescriptorPool, DESCRIPTOR_POOL_STATE *> *,
                                   std::unordered_map<VkDescriptorSet, cvdescriptorset::DescriptorSet *> *,
                                   core_validation::layer_data *);

/*
 * DescriptorSet class
 *
 * Overview - This class encapsulates the Vulkan VkDescriptorSet data (set).
 *   A set has an underlying layout which defines the bindings in the set and the
 *   types and numbers of descriptors in each descriptor slot. Most of the layout
 *   interfaces are exposed through identically-named functions in the set class.
 *   Please refer to the DescriptorSetLayout comment above for a description of
 *   index, binding, and global index.
 *
 * At construction a vector of Descriptor* is created with types corresponding to the
 *   layout. The primary operation performed on the descriptors is to update them
 *   via write or copy updates, and validate that the update contents are correct.
 *   In order to validate update contents, the DescriptorSet stores a bunch of ptrs
 *   to data maps where various Vulkan objects can be looked up. The management of
 *   those maps is performed externally. The set class relies on their contents to
 *   be correct at the time of update.
 */
class DescriptorSet : public BASE_NODE {
   public:
    DescriptorSet(const VkDescriptorSet, const VkDescriptorPool, const std::shared_ptr<DescriptorSetLayout const> &,
                  core_validation::layer_data *);
    ~DescriptorSet();
    // A number of common Get* functions that return data based on layout from which this set was created
    uint32_t GetTotalDescriptorCount() const { return p_layout_->GetTotalDescriptorCount(); };
    uint32_t GetDynamicDescriptorCount() const { return p_layout_->GetDynamicDescriptorCount(); };
    uint32_t GetBindingCount() const { return p_layout_->GetBindingCount(); };
    VkDescriptorType GetTypeFromIndex(const uint32_t index) const { return p_layout_->GetTypeFromIndex(index); };
    VkDescriptorType GetTypeFromGlobalIndex(const uint32_t index) const { return p_layout_->GetTypeFromGlobalIndex(index); };
    VkDescriptorType GetTypeFromBinding(const uint32_t binding) const { return p_layout_->GetTypeFromBinding(binding); };
    uint32_t GetDescriptorCountFromIndex(const uint32_t index) const { return p_layout_->GetDescriptorCountFromIndex(index); };
    uint32_t GetDescriptorCountFromBinding(const uint32_t binding) const {
        return p_layout_->GetDescriptorCountFromBinding(binding);
    };
    // Return index into dynamic offset array for given binding
    int32_t GetDynamicOffsetIndexFromBinding(uint32_t binding) const {
        return p_layout_->GetDynamicOffsetIndexFromBinding(binding);
    }
    // Return true if given binding is present in this set
    bool HasBinding(const uint32_t binding) const { return p_layout_->HasBinding(binding); };
    // Is this set compatible with the given layout?
    bool IsCompatible(DescriptorSetLayout const *const, std::string *) const;
    // For given bindings validate state at time of draw is correct, returning false on error and writing error details into string*
    bool ValidateDrawState(const std::map<uint32_t, descriptor_req> &, const std::vector<uint32_t> &, GLOBAL_CB_NODE *,
                           const char *caller, std::string *) const;
    // For given set of bindings, add any buffers and images that will be updated to their respective unordered_sets & return number
    // of objects inserted
    uint32_t GetStorageUpdates(const std::map<uint32_t, descriptor_req> &, std::unordered_set<VkBuffer> *,
                               std::unordered_set<VkImageView> *) const;

    // Descriptor Update functions. These functions validate state and perform update separately
    // Validate contents of a WriteUpdate
    bool ValidateWriteUpdate(const debug_report_data *, const VkWriteDescriptorSet *, UNIQUE_VALIDATION_ERROR_CODE *,
                             std::string *);
    // Perform a WriteUpdate whose contents were just validated using ValidateWriteUpdate
    void PerformWriteUpdate(const VkWriteDescriptorSet *);
    // Validate contents of a CopyUpdate
    bool ValidateCopyUpdate(const debug_report_data *, const VkCopyDescriptorSet *, const DescriptorSet *,
                            UNIQUE_VALIDATION_ERROR_CODE *, std::string *);
    // Perform a CopyUpdate whose contents were just validated using ValidateCopyUpdate
    void PerformCopyUpdate(const VkCopyDescriptorSet *, const DescriptorSet *);

    std::shared_ptr<DescriptorSetLayout const> const GetLayout() const { return p_layout_; };
    VkDescriptorSet GetSet() const { return set_; };
    // Return unordered_set of all command buffers that this set is bound to
    std::unordered_set<GLOBAL_CB_NODE *> GetBoundCmdBuffers() const { return cb_bindings; }
    // Bind given cmd_buffer to this descriptor set
    void BindCommandBuffer(GLOBAL_CB_NODE *, const std::map<uint32_t, descriptor_req> &);

    // Track work that has been bound or validated to avoid duplicate work, important when large descriptor arrays
    // are present
    typedef std::unordered_set<uint32_t> TrackedBindings;
    static void FilterAndTrackOneBindingReq(const BindingReqMap::value_type &binding_req_pair, const BindingReqMap &in_req,
                                            BindingReqMap *out_req, TrackedBindings *set);
    static void FilterAndTrackOneBindingReq(const BindingReqMap::value_type &binding_req_pair, const BindingReqMap &in_req,
                                            BindingReqMap *out_req, TrackedBindings *set, uint32_t limit);
    void FilterAndTrackBindingReqs(GLOBAL_CB_NODE *, const BindingReqMap &in_req, BindingReqMap *out_req);
    void FilterAndTrackBindingReqs(GLOBAL_CB_NODE *, PIPELINE_STATE *, const BindingReqMap &in_req, BindingReqMap *out_req);
    void ClearCachedDynamicDescriptorValidation(GLOBAL_CB_NODE *cb_state) { cached_validation_[cb_state].dynamic_buffers.clear(); }
    void ClearCachedValidation(GLOBAL_CB_NODE *cb_state) { cached_validation_.erase(cb_state); }
    // If given cmd_buffer is in the cb_bindings set, remove it
    void RemoveBoundCommandBuffer(GLOBAL_CB_NODE *cb_node) {
        cb_bindings.erase(cb_node);
        ClearCachedValidation(cb_node);
    }
    VkSampler const *GetImmutableSamplerPtrFromBinding(const uint32_t index) const {
        return p_layout_->GetImmutableSamplerPtrFromBinding(index);
    };
    // For a particular binding, get the global index
    const IndexRange &GetGlobalIndexRangeFromBinding(const uint32_t binding) const {
        return p_layout_->GetGlobalIndexRangeFromBinding(binding);
    };
    // Return true if any part of set has ever been updated
    bool IsUpdated() const { return some_update_; };
    bool IsPushDescriptor() const { return p_layout_->IsPushDescriptor(); };

   private:
    bool VerifyWriteUpdateContents(const VkWriteDescriptorSet *, const uint32_t, UNIQUE_VALIDATION_ERROR_CODE *,
                                   std::string *) const;
    bool VerifyCopyUpdateContents(const VkCopyDescriptorSet *, const DescriptorSet *, VkDescriptorType, uint32_t,
                                  UNIQUE_VALIDATION_ERROR_CODE *, std::string *) const;
    bool ValidateBufferUsage(BUFFER_STATE const *, VkDescriptorType, UNIQUE_VALIDATION_ERROR_CODE *, std::string *) const;
    bool ValidateBufferUpdate(VkDescriptorBufferInfo const *, VkDescriptorType, UNIQUE_VALIDATION_ERROR_CODE *,
                              std::string *) const;
    // Private helper to set all bound cmd buffers to INVALID state
    void InvalidateBoundCmdBuffers();
    bool some_update_;  // has any part of the set ever been updated?
    VkDescriptorSet set_;
    DESCRIPTOR_POOL_STATE *pool_state_;
    const std::shared_ptr<DescriptorSetLayout const> p_layout_;
    std::vector<std::unique_ptr<Descriptor>> descriptors_;
    // Ptr to device data used for various data look-ups
    core_validation::layer_data *const device_data_;
    const VkPhysicalDeviceLimits limits_;

    // Cached binding and validation support:
    //
    // For the lifespan of a given command buffer recording, do lazy evaluation, caching, and dirtying of
    // expensive validation operation (typically per-draw)
    typedef std::unordered_map<GLOBAL_CB_NODE *, TrackedBindings> TrackedBindingMap;
    typedef std::unordered_map<PIPELINE_STATE *, TrackedBindingMap> ValidatedBindings;
    // Track the validation caching of bindings vs. the command buffer and draw state
    typedef std::unordered_map<uint32_t, GLOBAL_CB_NODE::ImageLayoutUpdateCount> VersionedBindings;
    struct CachedValidation {
        TrackedBindings command_binding_and_usage;                               // Persistent for the life of the recording
        TrackedBindings non_dynamic_buffers;                                     // Persistent for the life of the recording
        TrackedBindings dynamic_buffers;                                         // Dirtied (flushed) each BindDescriptorSet
        std::unordered_map<PIPELINE_STATE *, VersionedBindings> image_samplers;  // Tested vs. changes to CB's ImageLayout
    };
    typedef std::unordered_map<GLOBAL_CB_NODE *, CachedValidation> CachedValidationMap;
    // Image and ImageView bindings are validated per pipeline and not invalidate by repeated binding
    CachedValidationMap cached_validation_;
};
// For the "bindless" style resource usage with many descriptors, need to optimize binding and validation
class PrefilterBindRequestMap {
   public:
    static const uint32_t kManyDescriptors_ = 64;  // TODO base this number on measured data
    std::unique_ptr<BindingReqMap> filtered_map_;
    const BindingReqMap &orig_map_;

    PrefilterBindRequestMap(DescriptorSet &ds, const BindingReqMap &in_map, GLOBAL_CB_NODE *cb_state);
    PrefilterBindRequestMap(DescriptorSet &ds, const BindingReqMap &in_map, GLOBAL_CB_NODE *cb_state, PIPELINE_STATE *);
    const BindingReqMap &Map() const { return (filtered_map_) ? *filtered_map_ : orig_map_; }
};
}
#endif  // CORE_VALIDATION_DESCRIPTOR_SETS_H_