Fix Android build.

filament/backend/CMakeLists.txt

@@ -214,6 +214,14 @@ if (FILAMENT_SUPPORTS_VULKAN)
             src/vulkan/VulkanMemory.h
             src/vulkan/VulkanPipelineCache.cpp
             src/vulkan/VulkanPipelineCache.h
+            src/vulkan/VulkanPipelineStateSerializer.cpp
+            src/vulkan/VulkanPipelineStateSerializer.h
+            src/vulkan/VulkanSamplerStateSerializer.h
+            src/vulkan/VulkanSamplerStateSerializer.cpp
+            src/vulkan/VulkanRenderPassStateSerializer.h
+            src/vulkan/VulkanRenderPassStateSerializer.cpp
+            src/vulkan/VulkanDescriptorSetLayoutSerializer.h
+            src/vulkan/VulkanDescriptorSetLayoutSerializer.cpp
             src/vulkan/VulkanPipelineLayoutCache.cpp
             src/vulkan/VulkanPipelineLayoutCache.h
             src/vulkan/VulkanQueryManager.cpp

filament/backend/src/vulkan/VulkanDescriptorSetLayoutCache.cpp

@@ -15,6 +15,7 @@
  */
 
 #include "VulkanDescriptorSetLayoutCache.h"
+#include "VulkanDescriptorSetLayoutSerializer.h"
 
 #include "VulkanHandles.h"
 
@@ -100,22 +101,32 @@ uint32_t appendSamplerBindings(VkDescriptorSetLayoutBinding* toBind,
     return count;
 }
 
-uint64_t computeImmutableSamplerHash(utils::FixedCapacityVector<VkSampler> const& samplers) {
+uint64_t computeImmutableSamplerHash(utils::FixedCapacityVector<VkSampler> const& samplers, VulkanSamplerCache* cache) {
     size_t const size = samplers.size();
     if (size == 0) {
         return 0;
-    } else if (size == 1) {
-        return (uint64_t) samplers[0];
     }
-    return utils::hash::murmur3((uint32_t*) samplers.data(), samplers.size() * 2, 0);
+
+    utils::FixedCapacityVector<uint32_t> samplerHash;
+    if (size > 0) {
+        samplerHash.reserve(MAX_SAMPLER_COUNT);
+        for (auto sampler : samplers) {
+            samplerHash.push_back(cache->getKey(sampler));
+        }
+    }
+
+    if (size == 1) {
+        return (uint64_t) samplerHash[0];
+    }
+    return utils::hash::murmur3((uint32_t*) samplerHash.data(), samplerHash.size() * 2, 0);
 }
 
 } // anonymous namespace
 
 VulkanDescriptorSetLayoutCache::VulkanDescriptorSetLayoutCache(VkDevice device,
-        fvkmemory::ResourceManager* resourceManager)
+        fvkmemory::ResourceManager* resourceManager, VulkanSamplerCache* cache)
     : mDevice(device),
-      mResourceManager(resourceManager) {}
+      mResourceManager(resourceManager), mSamplerCache(cache) {}
 
 VulkanDescriptorSetLayoutCache::~VulkanDescriptorSetLayoutCache() = default;
 
@@ -131,7 +142,7 @@ VkDescriptorSetLayout VulkanDescriptorSetLayoutCache::getVkLayout(
         utils::FixedCapacityVector<VkSampler> immutableSamplers) {
     LayoutKey key = {
         .bitmask = bitmasks,
-        .immutableSamplerHash = computeImmutableSamplerHash(immutableSamplers),
+        .immutableSamplerHash = computeImmutableSamplerHash(immutableSamplers, mSamplerCache),
     };
     if (auto itr = mVkLayouts.find(key); itr != mVkLayouts.end()) {
         return itr->second;
@@ -153,9 +164,20 @@ VkDescriptorSetLayout VulkanDescriptorSetLayoutCache::getVkLayout(
         .bindingCount = count,
         .pBindings = toBind,
     };
+    LayoutKeyHashFn hashFunc;
+    uint32_t hashedKey = hashFunc(key);
+    utils::FixedCapacityVector<uint32_t> immutableSamplersHashes;
+    immutableSamplersHashes.reserve(MAX_SAMPLER_COUNT);
+    for (auto sampler: immutableSamplers) {
+        immutableSamplersHashes.push_back(mSamplerCache->getKey(sampler));
+    }
+    VulkanDescriptorSetLayoutSerializer setSer(dlinfo, immutableSamplersHashes, hashedKey);
+
     VkDescriptorSetLayout vklayout;
     vkCreateDescriptorSetLayout(mDevice, &dlinfo, VKALLOC, &vklayout);
     mVkLayouts[key] = vklayout;
+
+    mLayoutToKey[vklayout] = hashedKey;
     return vklayout;
 }
 

filament/backend/src/vulkan/VulkanDescriptorSetLayoutCache.h

@@ -19,6 +19,8 @@
 
 #include "VulkanHandles.h"
 
+#include "VulkanSamplerCache.h"
+
 #include "vulkan/memory/ResourcePointer.h"
 
 #include <backend/DriverEnums.h>
@@ -35,7 +37,8 @@ namespace filament::backend {
 
 class VulkanDescriptorSetLayoutCache {
 public:
-    VulkanDescriptorSetLayoutCache(VkDevice device, fvkmemory::ResourceManager* resourceManager);
+    VulkanDescriptorSetLayoutCache(VkDevice device, fvkmemory::ResourceManager* resourceManager,
+            VulkanSamplerCache* cache);
     ~VulkanDescriptorSetLayoutCache();
 
     void terminate() noexcept;
@@ -48,10 +51,19 @@ public:
     VkDescriptorSetLayout getVkLayout(VulkanDescriptorSetLayout::Bitmask const& bitmasks,
             fvkutils::SamplerBitmask externalSamplers,
             utils::FixedCapacityVector<VkSampler> immutableSamplers = {});
+    uint32_t getKey(VkDescriptorSetLayout layout) {
+        uint32_t key = 0;
+        auto iter = mLayoutToKey.find(layout);
+        if (iter != mLayoutToKey.end()) {
+            key = iter->second;
+        }
+        return key;
+    }
 
 private:
     VkDevice mDevice;
     fvkmemory::ResourceManager* mResourceManager;
+    VulkanSamplerCache* mSamplerCache;
 
     struct LayoutKey {
         // this describes the layout using bitset.
@@ -69,6 +81,7 @@ private:
     };
 
     tsl::robin_map<LayoutKey, VkDescriptorSetLayout, LayoutKeyHashFn, LayoutKeyEqual> mVkLayouts;
+    std::map<VkDescriptorSetLayout, uint32_t> mLayoutToKey;
 };
 
 } // namespace filament::backend

filament/backend/src/vulkan/VulkanDescriptorSetLayoutSerializer.cpp

@@ -0,0 +1,87 @@
+#include "VulkanDescriptorSetLayoutSerializer.h"
+#include <fstream>
+#include <sstream>
+#include <utils/Hash.h>
+
+namespace filament::backend {
+VulkanDescriptorSetLayoutSerializer::VulkanDescriptorSetLayoutSerializer(
+        const VkDescriptorSetLayoutCreateInfo& info,
+        utils::FixedCapacityVector<uint32_t> immutableSamplers, uint32_t hash) {
+    std::stringstream filename;
+    filename << "descriptor_set_layout_" << hash << ".json";
+
+    std::ofstream file(filename.str());
+    if (file.is_open()) {
+        std::stringstream buffer;
+        buffer << "[" << std::endl;
+        for (uint32_t i = 0; i < info.bindingCount; ++i) {
+            buffer << "{" << std::endl;
+            buffer << "\"binding\":" << info.pBindings[i].binding << "," << std::endl;
+            buffer << "\"descriptor_type\":" << info.pBindings[i].descriptorType << "," << std::endl;
+            buffer << "\"stage_flags\":" << info.pBindings[i].stageFlags;
+            if (immutableSamplers.size()) {
+                buffer << "," << std::endl;
+                buffer << "\"immutable_samplers\":[" << std::endl;
+                for (uint32_t i = 0; i < immutableSamplers.size(); ++i) {
+                    buffer << immutableSamplers[i];
+                    if (i < immutableSamplers.size() - 1) {
+                        buffer << ",";
+                    }
+                }
+                buffer << "]";
+            }
+            buffer << std::endl;
+            buffer << "}";
+            if (i < info.bindingCount - 1) {
+                buffer << ",";
+            }
+            buffer << std::endl;
+        }
+        buffer << "]" << std::endl;
+
+        file << buffer.str();
+    }
+    file.close();
+}
+
+VulkanPipelineLayoutSerializer::VulkanPipelineLayoutSerializer(
+        const VkPipelineLayoutCreateInfo& info, VulkanDescriptorSetLayoutCache* cache,
+        uint32_t hash) {
+    std::stringstream filename;
+    filename << "pipeline_layout_" << hash << ".json";
+    std::ofstream file(filename.str());
+    if (file.is_open()) {
+        std::stringstream buffer;
+        buffer << "{" << std::endl;
+        buffer << "\"flags\":" << info.flags << "," << std::endl;
+
+        buffer << "\"layouts\":[" << std::endl;
+        for (uint32_t i = 0; i < info.setLayoutCount; ++i) {
+            buffer << cache->getKey(info.pSetLayouts[i]);
+            if (i < info.setLayoutCount - 1) {
+                buffer << ",";
+            }
+        }
+        buffer << "]," << std::endl;
+
+        buffer << "\"push_constants\":[" << std::endl;
+        for (uint32_t i = 0; i < info.pushConstantRangeCount; ++i) {
+            buffer << "{" << std::endl;
+            buffer << "\"stage_flags\":" << info.pPushConstantRanges[i].stageFlags << "," << std::endl;
+            buffer << "\"offset\":" << info.pPushConstantRanges[i].offset << ","
+                   << std::endl;
+            buffer << "\"size\":" << info.pPushConstantRanges[i].size
+                   << std::endl;
+            buffer << "}" << std::endl;
+            if (i < info.pushConstantRangeCount - 1) {
+                buffer << ",";
+            }
+        }
+        buffer << "]" << std::endl;
+
+        buffer << "}" << std::endl;
+        file << buffer.str();
+    }
+    file.close();
+ }
+} // namespace filament::backend

filament/backend/src/vulkan/VulkanDescriptorSetLayoutSerializer.h

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef TNT_FILAMENT_BACKEND_VULKANDESCRIPTORSETLAYOUTSERIALIZER_H
+#define TNT_FILAMENT_BACKEND_VULKANDESCRIPTORSETLAYOUTSERIALIZER_H
+
+#include "VulkanPipelineLayoutCache.h"
+#include "VulkanYcbcrConversionCache.h"
+#include <backend/DriverEnums.h>
+
+#include <bluevk/BlueVK.h>
+#include <iostream>
+#include <sstream>
+#include <vector>
+
+namespace filament::backend {
+
+class VulkanDescriptorSetLayoutSerializer {
+public:
+    VulkanDescriptorSetLayoutSerializer(VulkanDescriptorSetLayoutSerializer const&) = delete;
+    VulkanDescriptorSetLayoutSerializer& operator=(
+            VulkanDescriptorSetLayoutSerializer const&) = delete;
+
+    VulkanDescriptorSetLayoutSerializer(const VkDescriptorSetLayoutCreateInfo& info,
+            utils::FixedCapacityVector<uint32_t> immutableSamplers,
+            uint32_t hash);
+};
+
+class VulkanPipelineLayoutSerializer {
+public:
+    VulkanPipelineLayoutSerializer(VulkanPipelineLayoutSerializer const&) = delete;
+    VulkanPipelineLayoutSerializer& operator=(VulkanPipelineLayoutSerializer const&) = delete;
+
+    VulkanPipelineLayoutSerializer(const VkPipelineLayoutCreateInfo& layout,
+            VulkanDescriptorSetLayoutCache* cache, uint32_t hash);
+};
+
+} // namespace filament::backend
+
+#endif // TNT_FILAMENT_BACKEND_VULKANDESCRIPTORSETLAYOUTSERIALIZER_H

filament/backend/src/vulkan/VulkanDriver.cpp

@@ -230,16 +230,16 @@ VulkanDriver::VulkanDriver(VulkanPlatform* platform, VulkanContext& context,
       mCommands(mPlatform->getDevice(), mPlatform->getGraphicsQueue(),
               mPlatform->getGraphicsQueueFamilyIndex(), mPlatform->getProtectedGraphicsQueue(),
               mPlatform->getProtectedGraphicsQueueFamilyIndex(), mContext, &mSemaphoreManager),
-      mPipelineLayoutCache(mPlatform->getDevice()),
       mPipelineCache(mPlatform->getDevice()),
       mStagePool(mAllocator, &mResourceManager, &mCommands, &mContext.getPhysicalDeviceLimits()),
       mBufferCache(mContext, mResourceManager, mAllocator),
       mFramebufferCache(mPlatform->getDevice()),
       mYcbcrConversionCache(mPlatform->getDevice()),
-      mSamplerCache(mPlatform->getDevice()),
+      mSamplerCache(mPlatform->getDevice(), &mYcbcrConversionCache),
       mBlitter(mPlatform->getPhysicalDevice(), &mCommands),
       mReadPixels(mPlatform->getDevice()),
-      mDescriptorSetLayoutCache(mPlatform->getDevice(), &mResourceManager),
+      mDescriptorSetLayoutCache(mPlatform->getDevice(), &mResourceManager, &mSamplerCache),
+      mPipelineLayoutCache(mPlatform->getDevice(), &mDescriptorSetLayoutCache),
       mDescriptorSetCache(mPlatform->getDevice(), &mResourceManager),
       mQueryManager(mPlatform->getDevice()),
       mExternalImageManager(platform, &mSamplerCache, &mYcbcrConversionCache, &mDescriptorSetCache,
@@ -1666,7 +1666,7 @@ void VulkanDriver::beginRenderPass(Handle<HwRenderTarget> rth, const RenderPassP
     rpkey.subpassMask = uint8_t(params.subpassMask);
 
     VkRenderPass renderPass = mFramebufferCache.getRenderPass(rpkey);
-    mPipelineCache.bindRenderPass(renderPass, 0);
+    mPipelineCache.bindRenderPass(renderPass, mFramebufferCache.getRenderPassKey(renderPass), 0);
 
     // Create the VkFramebuffer or fetch it from cache.
     VulkanFboCache::FboKey fbkey = rt->getFboKey();
@@ -1785,6 +1785,7 @@ void VulkanDriver::nextSubpass(int) {
             VK_SUBPASS_CONTENTS_INLINE);
 
     mPipelineCache.bindRenderPass(mCurrentRenderPass.renderPass,
+            mFramebufferCache.getRenderPassKey(mCurrentRenderPass.renderPass),
             ++mCurrentRenderPass.currentSubpass);
 
     if (mCurrentRenderPass.params.subpassMask & 0x1) {
@@ -2160,7 +2161,8 @@ void VulkanDriver::bindPipelineImpl(PipelineState const& pipelineState,
     mPipelineState.pipelineLayout = pipelineLayout;
     mPipelineState.descriptorSetMask = descriptorSetMask;
 
-    mPipelineCache.bindLayout(pipelineLayout);
+    auto key = mPipelineLayoutCache.getKey(pipelineLayout);
+    mPipelineCache.bindLayout(pipelineLayout, key);
     mPipelineCache.bindPipeline(mCurrentRenderPass.commandBuffer);
 }
 

filament/backend/src/vulkan/VulkanDriver.h

@@ -148,7 +148,6 @@ private:
 
     VulkanSemaphoreManager mSemaphoreManager;
     VulkanCommands mCommands;
-    VulkanPipelineLayoutCache mPipelineLayoutCache;
     VulkanPipelineCache mPipelineCache;
     VulkanStagePool mStagePool;
     VulkanBufferCache mBufferCache;
@@ -158,6 +157,7 @@ private:
     VulkanBlitter mBlitter;
     VulkanReadPixels mReadPixels;
     VulkanDescriptorSetLayoutCache mDescriptorSetLayoutCache;
+    VulkanPipelineLayoutCache mPipelineLayoutCache;
     VulkanDescriptorSetCache mDescriptorSetCache;
     VulkanQueryManager mQueryManager;
     VulkanExternalImageManager mExternalImageManager;

filament/backend/src/vulkan/VulkanFboCache.cpp

@@ -15,6 +15,7 @@
  */
 
 #include "VulkanFboCache.h"
+#include "VulkanRenderPassStateSerializer.h"
 
 #include "VulkanConstants.h"
 #include "vulkan/utils/Image.h"
@@ -69,6 +70,15 @@ VulkanFboCache::~VulkanFboCache() {
             << "Please explicitly call terminate() while the VkDevice is still alive.";
 }
 
+uint32_t VulkanFboCache::getRenderPassKey(VkRenderPass pass) noexcept {
+    uint32_t key = 0;
+    auto iter = mRenderPassToKey.find(pass);
+    if (iter != mRenderPassToKey.end()) {
+        key = iter->second;
+    }
+    return key;
+}
+
 VkFramebuffer VulkanFboCache::getFramebuffer(FboKey const& config) noexcept {
     FboMap::iterator iter = mFramebufferCache.find(config);
     if (UTILS_LIKELY(iter != mFramebufferCache.end() && iter->second.handle != VK_NULL_HANDLE)) {
@@ -117,6 +127,7 @@ VkFramebuffer VulkanFboCache::getFramebuffer(FboKey const& config) noexcept {
     VkResult error = vkCreateFramebuffer(mDevice, &info, VKALLOC, &framebuffer);
     FILAMENT_CHECK_POSTCONDITION(error == VK_SUCCESS) << "Unable to create framebuffer."
                                                      << " error=" << static_cast<int32_t>(error);
+
     mFramebufferCache[config] = {framebuffer, mCurrentTime};
     return framebuffer;
 }
@@ -326,6 +337,12 @@ VkRenderPass VulkanFboCache::getRenderPass(RenderPassKey const& config) noexcept
     VkResult error = vkCreateRenderPass(mDevice, &renderPassInfo, VKALLOC, &renderPass);
     FILAMENT_CHECK_POSTCONDITION(error == VK_SUCCESS) << "Unable to create render pass."
                                                       << " error=" << error;
+
+    RenderPassHash hashFunc;
+    uint32_t key = hashFunc(config);
+    VulkanRenderPassStateSerializer passSer(renderPassInfo, key); 
+    mRenderPassToKey[renderPass] = key;
+
     mRenderPassCache[config] = {renderPass, mCurrentTime};
 
 #if FVK_ENABLED(FVK_DEBUG_FBO_CACHE)

filament/backend/src/vulkan/VulkanFboCache.h

@@ -24,6 +24,7 @@
 #include <backend/TargetBufferInfo.h>
 
 #include <tsl/robin_map.h>
+#include <map>
 
 namespace filament::backend {
 
@@ -97,6 +98,8 @@ public:
     explicit VulkanFboCache(VkDevice device);
     ~VulkanFboCache();
 
+    uint32_t getRenderPassKey(VkRenderPass pass) noexcept;
+
     // Retrieves or creates a VkFramebuffer handle.
     VkFramebuffer getFramebuffer(FboKey const& config) noexcept;
 
@@ -118,6 +121,7 @@ private:
     FboMap mFramebufferCache;
 
     tsl::robin_map<RenderPassKey, RenderPassVal, RenderPassHash, RenderPassEq> mRenderPassCache;
+    std::map<VkRenderPass, uint32_t> mRenderPassToKey;
     tsl::robin_map<VkRenderPass, uint32_t> mRenderPassRefCount;
     uint32_t mCurrentTime = 0;
 };

filament/backend/src/vulkan/VulkanHandles.cpp

@@ -33,6 +33,7 @@
 #include <utils/compiler.h> // UTILS_FALLTHROUGH
 #include <utils/Panic.h>    // ASSERT_POSTCONDITION
 #include <utils/CString.h>
+#include <fstream>
 
 using namespace bluevk;
 
@@ -179,6 +180,23 @@ VulkanAttachment createSwapchainAttachment(const fvkmemory::resource_ptr<VulkanT
     };
 }
 
+static inline uint64_t serializeShaderModule(utils::CString progName, VkShaderModuleCreateInfo info,
+        VkShaderStageFlagBits stage) {
+    std::stringstream filename;
+    filename << progName.c_str() << "_" << stage << "_";
+    constexpr uint32_t wordReadCount = 8;
+    uint64_t key = utils::hash::murmur3(info.pCode, wordReadCount, 0);
+    key |= uint64_t(utils::hash::murmur3(info.pCode + (wordReadCount / 2), wordReadCount, 0)) << 32;
+    filename << key << ".bin";
+
+    std::ofstream file(filename.str());
+    if (file.is_open()) {
+        file.write(reinterpret_cast<const char*>(info.pCode), info.codeSize);
+    }
+    file.close();
+    return key;
+}
+
 } // anonymous namespace
 
 VulkanDescriptorSetLayout::VulkanDescriptorSetLayout(DescriptorSetLayout&& layout,
@@ -280,6 +298,12 @@ VulkanProgram::VulkanProgram(VkDevice device, Program const& builder) noexcept
             .codeSize = dataSize,
             .pCode = data,
         };
+        if (i == 0) {
+            mVertexShaderHash = serializeShaderModule(name, moduleInfo, VK_SHADER_STAGE_VERTEX_BIT);
+        } else if (i == 1) {
+            mFragmentShaderHash =
+                    serializeShaderModule(name, moduleInfo, VK_SHADER_STAGE_FRAGMENT_BIT);
+        }
         VkResult result = vkCreateShaderModule(mDevice, &moduleInfo, VKALLOC, &module);
         FILAMENT_CHECK_POSTCONDITION(result == VK_SUCCESS)
                 << "Unable to create shader module."

filament/backend/src/vulkan/VulkanHandles.h

@@ -65,6 +65,8 @@ struct VulkanDescriptorSetLayout : public HwDescriptorSetLayout, fvkmemory::Reso
 
     using DescriptorSetLayoutArray = std::array<VkDescriptorSetLayout,
             VulkanDescriptorSetLayout::UNIQUE_DESCRIPTOR_SET_COUNT>;
+    using DescriptorSetLayoutHashArray = std::array<uint64_t,
+            VulkanDescriptorSetLayout::UNIQUE_DESCRIPTOR_SET_COUNT>;
 
     // The bitmask representation of a set layout.
     struct Bitmask {
@@ -280,6 +282,10 @@ struct VulkanProgram : public HwProgram, fvkmemory::Resource {
         mInfo->pushConstantDescription.write(cmdbuf, layout, stage, index, value);
     }
 
+    inline uint64_t getVertexShaderHash() { return mVertexShaderHash;
+    }
+    inline uint64_t getFragmentShaderHash() { return mFragmentShaderHash; }
+
     // TODO: handle compute shaders.
     // The expected order of shaders - from frontend to backend - is vertex, fragment, compute.
     static constexpr uint8_t const MAX_SHADER_MODULES = 2;
@@ -295,6 +301,8 @@ private:
     };
 
     PipelineInfo* mInfo;
+    uint64_t mVertexShaderHash;
+    uint64_t mFragmentShaderHash;
     VkDevice mDevice = VK_NULL_HANDLE;
 };
 

filament/backend/src/vulkan/VulkanPipelineCache.cpp

@@ -15,6 +15,7 @@
  */
 
 #include "VulkanPipelineCache.h"
+#include "VulkanPipelineStateSerializer.h"
 
 #include <utils/Log.h>
 #include <utils/Panic.h>
@@ -42,8 +43,9 @@ VulkanPipelineCache::VulkanPipelineCache(VkDevice device)
     bluevk::vkCreatePipelineCache(mDevice, &createInfo, VKALLOC, &mPipelineCache);
 }
 
-void VulkanPipelineCache::bindLayout(VkPipelineLayout layout) noexcept {
+void VulkanPipelineCache::bindLayout(VkPipelineLayout layout, uint32_t key) noexcept {
     mPipelineRequirements.layout = layout;
+    mPipelineLayoutKey = key;
 }
 
 VulkanPipelineCache::PipelineCacheEntry* VulkanPipelineCache::getOrCreatePipeline() noexcept {
@@ -77,6 +79,7 @@ void VulkanPipelineCache::bindPipeline(VulkanCommandBuffer* commands) {
 VulkanPipelineCache::PipelineCacheEntry* VulkanPipelineCache::createPipeline() noexcept {
     assert_invariant(mPipelineRequirements.shaders[0] && "Vertex shader is not bound.");
     assert_invariant(mPipelineRequirements.layout && "No pipeline layout specified");
+    VulkanPipelineStateSerializer serializer(mProgramName);
 
     VkPipelineShaderStageCreateInfo shaderStages[SHADER_MODULE_COUNT];
     shaderStages[0] = {
@@ -89,6 +92,12 @@ VulkanPipelineCache::PipelineCacheEntry* VulkanPipelineCache::createPipeline() n
     shaderStages[1].stage = VK_SHADER_STAGE_FRAGMENT_BIT;
     shaderStages[1].module = mPipelineRequirements.shaders[1];
 
+    VulkanPipelineStateSerializer::ShaderStageInfo vtx = { shaderStages[0].stage, mVertexShaderHash,
+        shaderStages[0].pName };
+    VulkanPipelineStateSerializer::ShaderStageInfo frg = { shaderStages[1].stage, mFragmentShaderHash,
+        shaderStages[1].pName };
+    serializer << vtx << frg;
+
     bool const hasFragmentShader = shaderStages[1].module != VK_NULL_HANDLE;
 
     VkPipelineColorBlendAttachmentState colorBlendAttachments[MRT::MAX_SUPPORTED_RENDER_TARGET_COUNT];
@@ -107,9 +116,11 @@ VulkanPipelineCache::PipelineCacheEntry* VulkanPipelineCache::createPipeline() n
     for (uint32_t i = 0; i < VERTEX_ATTRIBUTE_COUNT; i++) {
         if (mPipelineRequirements.vertexAttributes[i].format > 0) {
             vertexAttributes[numVertexAttribs++] = mPipelineRequirements.vertexAttributes[i];
+            serializer << mPipelineRequirements.vertexAttributes[i];
         }
         if (mPipelineRequirements.vertexBuffers[i].stride > 0) {
             vertexBuffers[numVertexBuffers++] = mPipelineRequirements.vertexBuffers[i];
+            serializer << mPipelineRequirements.vertexBuffers[i];
         }
     }
     VkPipelineVertexInputStateCreateInfo vertexInputState = {
@@ -123,11 +134,15 @@ VulkanPipelineCache::PipelineCacheEntry* VulkanPipelineCache::createPipeline() n
         .sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO,
         .topology = (VkPrimitiveTopology) mPipelineRequirements.topology,
     };
+    serializer << inputAssemblyState;
+
     VkPipelineViewportStateCreateInfo viewportState = {
         .sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO,
         .viewportCount = 1,
         .scissorCount = 1,
     };
+    serializer << viewportState;
+
     VkDynamicState dynamicStateEnables[] = {
         VK_DYNAMIC_STATE_VIEWPORT,
         VK_DYNAMIC_STATE_SCISSOR,
@@ -137,6 +152,8 @@ VulkanPipelineCache::PipelineCacheEntry* VulkanPipelineCache::createPipeline() n
         .dynamicStateCount = 2,
         .pDynamicStates = dynamicStateEnables,
     };
+    serializer << dynamicState;
+
     auto const& raster = mPipelineRequirements.rasterState;
     VkPipelineRasterizationStateCreateInfo vkRaster = {
         .sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO,
@@ -150,6 +167,8 @@ VulkanPipelineCache::PipelineCacheEntry* VulkanPipelineCache::createPipeline() n
         .depthBiasSlopeFactor = raster.depthBiasSlopeFactor,
         .lineWidth = 1.0f,
     };
+    serializer << vkRaster;
+
     VkPipelineMultisampleStateCreateInfo vkMs = {
         .sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO,
         .rasterizationSamples = (VkSampleCountFlagBits) raster.rasterizationSamples,
@@ -158,6 +177,8 @@ VulkanPipelineCache::PipelineCacheEntry* VulkanPipelineCache::createPipeline() n
         .alphaToCoverageEnable = raster.alphaToCoverageEnable,
         .alphaToOneEnable = VK_FALSE,
     };
+    serializer << vkMs;
+
     VkPipelineDepthStencilStateCreateInfo vkDs = {
         .sType = VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO,
         .depthTestEnable = VK_TRUE,
@@ -177,6 +198,12 @@ VulkanPipelineCache::PipelineCacheEntry* VulkanPipelineCache::createPipeline() n
         .writeMask = 0u,
         .reference = 0u,
     };
+    serializer << vkDs;
+
+    //layout
+    serializer.setPipelineLayoutKey(mPipelineLayoutKey);
+    // renderPass
+    serializer.setRenderPassKey(mRenderPassKey);
 
     VkGraphicsPipelineCreateInfo pipelineCreateInfo = {
         .sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO,
@@ -215,6 +242,7 @@ VulkanPipelineCache::PipelineCacheEntry* VulkanPipelineCache::createPipeline() n
             colorBlendAttachments[i] = colorBlendAttachments[0];
         }
     }
+    serializer << colorBlendState;
 
     #if FVK_ENABLED(FVK_DEBUG_SHADER_MODULE)
         FVK_LOGD << "vkCreateGraphicsPipelines with shaders = ("
@@ -230,12 +258,20 @@ VulkanPipelineCache::PipelineCacheEntry* VulkanPipelineCache::createPipeline() n
         FVK_LOGE << "vkCreateGraphicsPipelines error " << error;
         return nullptr;
     }
+
+    PipelineHashFn hashFunc;
+
+    serializer.setID(hashFunc(mPipelineRequirements));
     return &mPipelines.emplace(mPipelineRequirements, cacheEntry).first.value();
 }
 
 void VulkanPipelineCache::bindProgram(fvkmemory::resource_ptr<VulkanProgram> program) noexcept {
     mPipelineRequirements.shaders[0] = program->getVertexShader();
     mPipelineRequirements.shaders[1] = program->getFragmentShader();
+    mProgramName = program->name;
+    mVertexShaderHash = program->getVertexShaderHash();
+    mFragmentShaderHash= program->getFragmentShaderHash();
+    
 
     // If this is a debug build, validate the current shader.
 #if FVK_ENABLED(FVK_DEBUG_SHADER_MODULE)
@@ -250,9 +286,10 @@ void VulkanPipelineCache::bindRasterState(RasterState const& rasterState) noexce
     mPipelineRequirements.rasterState = rasterState;
 }
 
-void VulkanPipelineCache::bindRenderPass(VkRenderPass renderPass, int subpassIndex) noexcept {
+void VulkanPipelineCache::bindRenderPass(VkRenderPass renderPass, uint32_t passKey, int subpassIndex) noexcept {
     mPipelineRequirements.renderPass = renderPass;
     mPipelineRequirements.subpassIndex = subpassIndex;
+    mRenderPassKey = passKey;
 }
 
 void VulkanPipelineCache::bindPrimitiveTopology(VkPrimitiveTopology topology) noexcept {

filament/backend/src/vulkan/VulkanPipelineCache.h

@@ -88,7 +88,7 @@ public:
 
     VulkanPipelineCache(VkDevice device);
 
-    void bindLayout(VkPipelineLayout layout) noexcept;
+    void bindLayout(VkPipelineLayout layout, uint32_t key) noexcept;
 
     // Creates a new pipeline if necessary and binds it using vkCmdBindPipeline.
     void bindPipeline(VulkanCommandBuffer* commands);
@@ -96,7 +96,7 @@ public:
     // Each of the following methods are fast and do not make Vulkan calls.
     void bindProgram(fvkmemory::resource_ptr<VulkanProgram> program) noexcept;
     void bindRasterState(RasterState const& rasterState) noexcept;
-    void bindRenderPass(VkRenderPass renderPass, int subpassIndex) noexcept;
+    void bindRenderPass(VkRenderPass renderPass, uint32_t passKey, int subpassIndex) noexcept;
     void bindPrimitiveTopology(VkPrimitiveTopology topology) noexcept;
     void bindVertexArray(VkVertexInputAttributeDescription const* attribDesc,
             VkVertexInputBindingDescription const* bufferDesc, uint8_t count);
@@ -207,6 +207,11 @@ private:
 
     // Current requirements for the pipeline layout, pipeline, and descriptor sets.
     PipelineKey mPipelineRequirements = {};
+    utils::CString mProgramName;
+    uint64_t mVertexShaderHash;
+    uint64_t mFragmentShaderHash;
+    uint32_t mPipelineLayoutKey;
+    uint32_t mRenderPassKey;
 
     // Current bindings for the pipeline and descriptor sets.
     PipelineKey mBoundPipeline = {};

filament/backend/src/vulkan/VulkanPipelineLayoutCache.cpp

@@ -15,6 +15,7 @@
  */
 
 #include "VulkanPipelineLayoutCache.h"
+#include "VulkanDescriptorSetLayoutSerializer.h"
 
 namespace filament::backend {
 
@@ -23,7 +24,11 @@ VkPipelineLayout VulkanPipelineLayoutCache::getLayout(
         fvkmemory::resource_ptr<VulkanProgram> program) {
     PipelineLayoutKey key = {};
     uint8_t descSetLayoutCount = 0;
-    key.descSetLayouts = descriptorSetLayouts;
+    DescriptorSetLayoutHashArray hashArray;
+    for (uint32_t i = 0; i < descriptorSetLayouts.size(); ++i) {
+        hashArray[i] = mDescriptorSetCache->getKey(descriptorSetLayouts[i]);
+    }
+    key.descSetLayouts = hashArray;
     for (auto layoutHandle: descriptorSetLayouts) {
         if (layoutHandle == VK_NULL_HANDLE) {
             break;
@@ -62,11 +67,14 @@ VkPipelineLayout VulkanPipelineLayoutCache::getLayout(
         .sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
         .pNext = nullptr,
         .setLayoutCount = (uint32_t) descSetLayoutCount,
-        .pSetLayouts = key.descSetLayouts.data(),
+        .pSetLayouts = descriptorSetLayouts.data(),
         .pushConstantRangeCount = pushConstantRangeCount,
         .pPushConstantRanges = pushConstantRanges,
     };
 
+    PipelineLayoutKeyHashFn hashFunc;
+    uint32_t hashedKey = hashFunc(key);
+    VulkanPipelineLayoutSerializer pipelineSer(info, mDescriptorSetCache, hashedKey);
     VkPipelineLayout layout;
     vkCreatePipelineLayout(mDevice, &info, VKALLOC, &layout);
 
@@ -74,6 +82,8 @@ VkPipelineLayout VulkanPipelineLayoutCache::getLayout(
         .handle = layout,
         .lastUsed = mTimestamp++,
     };
+
+    mPipelineToKey[layout] = hashedKey;
     return layout;
 }
 

filament/backend/src/vulkan/VulkanPipelineLayoutCache.h

@@ -18,6 +18,7 @@
 #define TNT_FILAMENT_BACKEND_VULKANPIPELINELAYOUTCACHE_H
 
 #include "VulkanHandles.h"
+#include "VulkanDescriptorSetLayoutCache.h"
 
 #include <bluevk/BlueVK.h>
 
@@ -30,10 +31,11 @@ namespace filament::backend {
 class VulkanPipelineLayoutCache {
 public:
     using DescriptorSetLayoutArray = VulkanDescriptorSetLayout::DescriptorSetLayoutArray;
+    using DescriptorSetLayoutHashArray = VulkanDescriptorSetLayout::DescriptorSetLayoutHashArray;
     
-    VulkanPipelineLayoutCache(VkDevice device)
+    VulkanPipelineLayoutCache(VkDevice device, VulkanDescriptorSetLayoutCache* cache)
         : mDevice(device),
-          mTimestamp(0) {}
+          mTimestamp(0), mDescriptorSetCache(cache) {}
 
     void terminate() noexcept;
 
@@ -45,7 +47,7 @@ public:
     };
 
     struct PipelineLayoutKey {
-        DescriptorSetLayoutArray descSetLayouts = {};                                     // 8 * 4
+        DescriptorSetLayoutHashArray descSetLayouts = {};              // 8 * 4
         PushConstantKey pushConstant[Program::SHADER_TYPE_COUNT] = {};                    // 2 * 3
         uint16_t padding = 0;
     };
@@ -58,6 +60,14 @@ public:
     // are described in the program.
     VkPipelineLayout getLayout(DescriptorSetLayoutArray const& descriptorSetLayouts,
             fvkmemory::resource_ptr<VulkanProgram> program);
+    uint32_t getKey(VkPipelineLayout layout) {
+        uint32_t key = 0;
+        auto iter = mPipelineToKey.find(layout);
+        if (iter != mPipelineToKey.end()) {
+            key = iter->second;
+        }
+        return key;
+    }
 
 private:
     using Timestamp = uint64_t;
@@ -79,6 +89,8 @@ private:
     VkDevice mDevice;
     Timestamp mTimestamp;
     PipelineLayoutMap mPipelineLayouts;
+    std::map<VkPipelineLayout, uint32_t> mPipelineToKey;
+    VulkanDescriptorSetLayoutCache* mDescriptorSetCache;
 };
 
 } // filament::backend

filament/backend/src/vulkan/VulkanPipelineStateSerializer.cpp

@@ -0,0 +1,251 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#include <fstream>
+
+#include "VulkanPipelineStateSerializer.h"
+#include <utils/Log.h>
+#include <utils/Panic.h>
+
+#include "VulkanConstants.h"
+#include "VulkanHandles.h"
+
+#if defined(__clang__)
+// Vulkan functions often immediately dereference pointers, so it's fine to pass in a pointer
+// to a stack-allocated variable.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wreturn-stack-address"
+#endif
+
+using namespace bluevk;
+
+namespace filament::backend {
+
+VulkanPipelineStateSerializer::VulkanPipelineStateSerializer(const utils::CString& name) { 
+    mBuffer << "{" << std::endl;
+    mBuffer << "\"program_name\":" << "\"" << name.c_str() << "\"" << "," << std::endl;
+}
+VulkanPipelineStateSerializer::~VulkanPipelineStateSerializer() {
+    //Shader Modules
+    mBuffer << "\"shader_modules\":[" << std::endl;
+    for (uint32_t i = 0; i < mShaderStages.size(); ++i) {
+        mBuffer << "{" << std::endl;
+        mBuffer << "\"stage\":" << mShaderStages[i].stage << "," << std::endl;
+        mBuffer << "\"key\":" << mShaderStages[i].module  << "," << std::endl;
+        mBuffer << "\"name\":" << "\"" << mShaderStages[i].mName << "\"" << std::endl;
+        mBuffer << "}";
+        if (i < mShaderStages.size() - 1) {
+            mBuffer << ",";
+        }
+        mBuffer <<  std::endl;
+    }
+    mBuffer << "]," << std::endl;
+
+    //Vertex Attribute
+    mBuffer << "\"vertex_attributes\":[" << std::endl;
+    for (uint32_t i = 0; i < mVtxAttribs.size(); ++i) {
+        mBuffer << "{" << std::endl;
+        mBuffer << "\"location\":" << mVtxAttribs[i].location << "," << std::endl;
+        mBuffer << "\"binding\":" <<  mVtxAttribs[i].binding << "," << std::endl;
+        mBuffer << "\"format\":" << mVtxAttribs[i].format << "," << std::endl;
+        mBuffer << "\"offset\":" << mVtxAttribs[i].offset << std::endl;
+        mBuffer << "}";
+        if (i < mVtxAttribs.size() - 1) {
+            mBuffer << ",";
+        }
+        mBuffer << std::endl;
+    }
+    mBuffer << "]," << std::endl;
+
+    // Vertex Bindings
+    mBuffer << "\"vertex_bindings\":[" << std::endl;
+    for (uint32_t i = 0; i < mVtxBindings.size(); ++i) {
+        mBuffer << "{" << std::endl;
+        mBuffer << "\"binding\":" << mVtxBindings[i].binding << "," << std::endl;
+        mBuffer << "\"stride\":" << mVtxBindings[i].stride << "," << std::endl;
+        mBuffer << "\"input_rate\":" << mVtxBindings[i].inputRate << std::endl;
+        mBuffer << "}";
+        if (i < mVtxBindings.size() - 1) {
+            mBuffer << ",";
+        }
+        mBuffer << std::endl;
+    }
+    mBuffer << "]" << std::endl;
+
+    mBuffer << "}" << std::endl;
+
+    std::ofstream file(mFileName);
+    if (file.is_open()) {
+        file << mBuffer.str();
+    }
+    file.close();
+}
+
+void VulkanPipelineStateSerializer::setPipelineLayoutKey(uint32_t pipelineLayoutKey) {
+    mBuffer << "\"layout\":" << pipelineLayoutKey << "," << std::endl;
+}
+
+void VulkanPipelineStateSerializer::setRenderPassKey(uint32_t renderPassKey) {
+    mBuffer << "\"render_pass\":" << renderPassKey << "," << std::endl;
+}
+
+void VulkanPipelineStateSerializer::setID(uint32_t key) {
+    std::stringstream temp;
+    temp << "pipeline_" << key << ".json";
+    temp >> mFileName;
+}
+
+VulkanPipelineStateSerializer& VulkanPipelineStateSerializer::operator<<(
+        const VkPipelineInputAssemblyStateCreateInfo& inputAsm) {
+    mBuffer << "\"topology\":" << inputAsm.topology << "," << std::endl;
+    return *this;
+}
+
+VulkanPipelineStateSerializer& VulkanPipelineStateSerializer::operator<<(
+        const VkPipelineViewportStateCreateInfo& viewport) {
+    mBuffer << "\"viewport_count\":" << viewport.viewportCount << "," << std::endl;
+    mBuffer << "\"scissor_count\":" << viewport.scissorCount << "," << std::endl;
+    return *this;
+}
+
+VulkanPipelineStateSerializer& VulkanPipelineStateSerializer::operator<<(
+        const VkPipelineRasterizationStateCreateInfo& rasterState) {
+    mBuffer << "\"raster_states\":{" << std::endl;
+    mBuffer << "\"depth_clamp_enable\":" << rasterState.depthClampEnable << "," << std::endl;
+    mBuffer << "\"polygon_mode\":" << rasterState.polygonMode << "," << std::endl;
+    mBuffer << "\"cull_mode\":" << rasterState.cullMode << "," << std::endl;
+    mBuffer << "\"front_face\":" << rasterState.frontFace << "," << std::endl;
+    mBuffer << "\"depth_bias_enable\":" << rasterState.depthBiasEnable << "," << std::endl;
+    mBuffer << "\"depth_bias_constant_factor\":" << rasterState.depthBiasConstantFactor << ","
+            << std::endl;
+    mBuffer << "\"depth_bias_clamp\":" << rasterState.depthBiasClamp << "," << std::endl;
+    mBuffer << "\"depth_bias_slope_factor\":" << rasterState.depthBiasSlopeFactor << "," << std::endl;
+    mBuffer << "\"line_width\":" << rasterState.lineWidth << std::endl;
+    mBuffer << "}," << std::endl;
+    return *this;
+}
+
+VulkanPipelineStateSerializer& VulkanPipelineStateSerializer::operator<<(
+        const VkPipelineDepthStencilStateCreateInfo& depthStencil) {
+    mBuffer << "\"depth_stencil_states\":{" << std::endl;
+    mBuffer << "\"depth_test_enable\":" << depthStencil.depthTestEnable << "," << std::endl;
+    mBuffer << "\"depth_write_enable\":" << depthStencil.depthWriteEnable << "," << std::endl;
+    mBuffer << "\"depth_compare_op\":" << depthStencil.depthCompareOp << "," << std::endl;
+    mBuffer << "\"depth_bounds_test_enable\":" << depthStencil.depthBoundsTestEnable << ","
+            << std::endl;
+    mBuffer << "\"min_depth_bounds\":" << depthStencil.minDepthBounds << "," << std::endl;
+    mBuffer << "\"max_depth_bounds\":" << depthStencil.maxDepthBounds << "," << std::endl;
+    mBuffer << "\"front\":{" << std::endl;
+    mBuffer << "\"fail_op\":" << depthStencil.front.failOp << "," << std::endl;
+    mBuffer << "\"pass_op\":" << depthStencil.front.passOp << "," << std::endl;
+    mBuffer << "\"depth_fail_op\":" << depthStencil.front.depthFailOp << "," << std::endl;
+    mBuffer << "\"compare_op\":" << depthStencil.front.compareOp << "," << std::endl;
+    mBuffer << "\"compare_mask\":" << depthStencil.front.compareMask << "," << std::endl;
+    mBuffer << "\"write_mask\":" << depthStencil.front.writeMask << "," << std::endl;
+    mBuffer << "\"reference\":" << depthStencil.front.reference << std::endl;
+    mBuffer << "}," << std::endl;
+    mBuffer << "\"back\":{" << std::endl;
+    mBuffer << "\"fail_op\":" << depthStencil.back.failOp << "," << std::endl;
+    mBuffer << "\"pass_op\":" << depthStencil.back.passOp << "," << std::endl;
+    mBuffer << "\"depth_fail_op\":" << depthStencil.back.depthFailOp << "," << std::endl;
+    mBuffer << "\"compare_op\":" << depthStencil.back.compareOp << "," << std::endl;
+    mBuffer << "\"compare_mask\":" << depthStencil.back.compareMask << "," << std::endl;
+    mBuffer << "\"write_mask\":" << depthStencil.back.writeMask << "," << std::endl;
+    mBuffer << "\"reference\":" << depthStencil.back.reference << std::endl;
+    mBuffer << "}" << std::endl;
+    mBuffer << "}," << std::endl;
+    return *this;
+}
+
+VulkanPipelineStateSerializer& VulkanPipelineStateSerializer::operator<<(
+        const VkPipelineMultisampleStateCreateInfo& multiSample) {
+    mBuffer << "\"multisample_states\":{" << std::endl;
+    mBuffer << "\"rasterization_samples\":" << multiSample.rasterizationSamples << "," << std::endl;
+    mBuffer << "\"sample_shading_enable\":" << multiSample.sampleShadingEnable << "," << std::endl;
+    mBuffer << "\"min_sample_shading\":" << multiSample.minSampleShading << "," << std::endl;
+    mBuffer << "\"alpha_to_coverage_enable\":" << multiSample.alphaToCoverageEnable << ","
+            << std::endl;
+    mBuffer << "\"alpha_to_one_enable\":" << multiSample.alphaToOneEnable << std::endl;
+    mBuffer << "}," << std::endl;
+    return *this;
+}
+
+VulkanPipelineStateSerializer& VulkanPipelineStateSerializer::operator<<(
+        const VkPipelineDynamicStateCreateInfo& dyStates) {
+    mBuffer << "\"dynamic_states\":[" << std::endl;
+    for (uint32_t i = 0; i < dyStates.dynamicStateCount; ++i) {
+        mBuffer << dyStates.pDynamicStates[i];
+        if (i < dyStates.dynamicStateCount - 1) {
+            mBuffer << ",";
+        }
+        mBuffer << std::endl;
+    }
+    mBuffer << "]," << std::endl;
+    return *this;
+}
+
+VulkanPipelineStateSerializer& VulkanPipelineStateSerializer::operator<<(
+        const VkPipelineColorBlendStateCreateInfo& blendStateInfo) {
+    mBuffer << "\"color_blend_state_attachments\":[" << std::endl;
+    for (uint32_t i = 0; i < blendStateInfo.attachmentCount; ++i) {
+        mBuffer << "{" << std::endl;
+        mBuffer << "\"blend_enable\":" << blendStateInfo.pAttachments[i].blendEnable << ","
+                << std::endl;
+        mBuffer << "\"src_color_blend_factor\":" << blendStateInfo.pAttachments[i].srcColorBlendFactor
+                << ","
+                << std::endl;
+        mBuffer << "\"dst_color_blend_factor\":" << blendStateInfo.pAttachments[i].dstColorBlendFactor
+                << ","
+                << std::endl;
+        mBuffer << "\"color_blend_op\":" << blendStateInfo.pAttachments[i].colorBlendOp << ","
+                << std::endl;
+        mBuffer << "\"src_alpha_blend_factor\":" << blendStateInfo.pAttachments[i].srcAlphaBlendFactor
+                << ","
+                << std::endl;
+        mBuffer << "\"dst_alpha_blend_factor\":" << blendStateInfo.pAttachments[i].dstAlphaBlendFactor
+                << ","
+                << std::endl;
+        mBuffer << "\"alpha_blend_op\":" << blendStateInfo.pAttachments[i].alphaBlendOp << ","
+                << std::endl;
+        mBuffer << "\"color_write_mask\":" << blendStateInfo.pAttachments[i].colorWriteMask
+                << std::endl;
+        mBuffer << "}";
+        if (i < blendStateInfo.attachmentCount - 1) {
+            mBuffer << ",";
+        }
+        mBuffer << std::endl;
+    }
+    mBuffer << "]," << std::endl;
+    return *this;
+}
+
+VulkanPipelineStateSerializer& VulkanPipelineStateSerializer::operator<<(
+        const ShaderStageInfo& shaderStages) {
+    mShaderStages.push_back(shaderStages);
+    return *this;
+}
+
+VulkanPipelineStateSerializer& VulkanPipelineStateSerializer::operator<<(
+    const VkVertexInputAttributeDescription& attrib) {
+    mVtxAttribs.push_back(attrib);
+    return *this;
+}
+VulkanPipelineStateSerializer& VulkanPipelineStateSerializer::operator<<(
+    const VkVertexInputBindingDescription& binding) {
+    mVtxBindings.push_back(binding);
+    return *this;
+}
+}

filament/backend/src/vulkan/VulkanPipelineStateSerializer.h

@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef TNT_FILAMENT_BACKEND_VULKANPIPELINESTATESERIALIZER_H
+#define TNT_FILAMENT_BACKEND_VULKANPIPELINESTATESERIALIZER_H
+
+#include "VulkanCommands.h"
+
+#include <backend/DriverEnums.h>
+#include <backend/TargetBufferInfo.h>
+
+#include <bluevk/BlueVK.h>
+#include <iostream>
+#include <type_traits>
+#include <sstream>
+#include <vector>
+
+namespace filament::backend {
+
+// VulkanPipelineStateSerializer stores to a file the pipeline states.
+class VulkanPipelineStateSerializer {
+public:
+    VulkanPipelineStateSerializer(VulkanPipelineStateSerializer const&) = delete;
+    VulkanPipelineStateSerializer& operator=(VulkanPipelineStateSerializer const&) = delete;
+
+    VulkanPipelineStateSerializer(const utils::CString& name);
+    ~VulkanPipelineStateSerializer();
+
+    void setID(uint32_t key);
+    void setPipelineLayoutKey(uint32_t pipelineLayoutKey);
+    void setRenderPassKey(uint32_t renderPassKey); 
+    VulkanPipelineStateSerializer& operator<<(
+            const VkPipelineInputAssemblyStateCreateInfo& inputAsm);
+    VulkanPipelineStateSerializer& operator<<(const VkPipelineViewportStateCreateInfo& viewport);
+    VulkanPipelineStateSerializer& operator<<(const VkPipelineDynamicStateCreateInfo& dyStates);
+    VulkanPipelineStateSerializer& operator<<(
+            const VkPipelineRasterizationStateCreateInfo& rasterState);
+    VulkanPipelineStateSerializer& operator<<(
+            const VkPipelineDepthStencilStateCreateInfo& depthStencil);
+    VulkanPipelineStateSerializer& operator<<(const VkPipelineMultisampleStateCreateInfo& multiSample);
+    VulkanPipelineStateSerializer& operator<<(
+            const VkPipelineColorBlendStateCreateInfo& blendStateInfo);
+
+    struct ShaderStageInfo {
+        VkShaderStageFlagBits stage;
+        uint64_t module;
+        std::string mName;
+    };
+    VulkanPipelineStateSerializer& operator<<(const ShaderStageInfo& shaderStages);
+    VulkanPipelineStateSerializer& operator<<(
+            const VkVertexInputAttributeDescription& attrib);
+    VulkanPipelineStateSerializer& operator<<(const VkVertexInputBindingDescription& binding);
+
+private:
+    std::string mFileName;
+    std::stringstream mBuffer;
+
+    //temp data
+    utils::CString mProgramName;
+    std::vector<ShaderStageInfo> mShaderStages;
+    std::vector<VkVertexInputAttributeDescription> mVtxAttribs;
+    std::vector<VkVertexInputBindingDescription> mVtxBindings;
+};
+} // namespace filament::backend
+
+#endif //TNT_FILAMENT_BACKEND_VULKANPIPELINESTATESERIALIZER_H

filament/backend/src/vulkan/VulkanRenderPassStateSerializer.cpp

@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#include <fstream>
+
+#include "VulkanRenderPassStateSerializer.h"
+#include <utils/Log.h>
+#include <utils/Panic.h>
+
+#include "VulkanConstants.h"
+#include "VulkanHandles.h"
+
+#if defined(__clang__)
+// Vulkan functions often immediately dereference pointers, so it's fine to pass in a pointer
+// to a stack-allocated variable.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wreturn-stack-address"
+#endif
+
+using namespace bluevk;
+
+namespace filament::backend {
+
+VulkanRenderPassStateSerializer::VulkanRenderPassStateSerializer(
+        const VkRenderPassCreateInfo& info, uint32_t key) {
+    std::stringstream filename;
+    filename << "render_pass_" << key << ".json";
+
+    std::ofstream file(filename.str());
+    if (file.is_open()) {
+        std::stringstream buffer;
+        buffer << "{" << std::endl;
+        buffer << "\"attachments\":[" << std::endl;
+        for (uint32_t i = 0; i < info.attachmentCount; ++i) {
+            buffer << "{" << std::endl;
+            buffer << "\"flags\":" << info.pAttachments[i].flags << "," << std::endl;
+            buffer << "\"format\":" << info.pAttachments[i].format << "," << std::endl;
+            buffer << "\"samples\":" << info.pAttachments[i].samples << "," << std::endl;
+            buffer << "\"load_op\":" << info.pAttachments[i].loadOp << "," << std::endl;
+            buffer << "\"store_op\":" << info.pAttachments[i].storeOp << "," << std::endl;
+            buffer << "\"stencil_load_op\":" << info.pAttachments[i].stencilLoadOp << "," << std::endl;
+            buffer << "\"stencil_store_op\":" << info.pAttachments[i].stencilStoreOp << "," << std::endl;
+            buffer << "\"initial_layout\":" << info.pAttachments[i].initialLayout << "," << std::endl;
+            buffer << "\"final_layout\":" << info.pAttachments[i].finalLayout << std::endl;
+            buffer << "}";
+            if (i < info.attachmentCount - 1) {
+                buffer << ",";
+            }
+            buffer << std::endl;
+        }
+        buffer << "]," << std::endl;
+
+        buffer << "\"subpasses\":[" << std::endl;
+        for (uint32_t i = 0; i < info.subpassCount; ++i) {
+            buffer << "{" << std::endl;
+            buffer << "\"flags\":" << info.pSubpasses[i].flags << "," << std::endl;
+            buffer << "\"pipeline_bind_point\":" << info.pSubpasses[i].pipelineBindPoint;
+            
+            //------------depth stencil-------------------
+            if (info.pSubpasses[i].pDepthStencilAttachment) {
+                buffer << "," << std::endl;
+                buffer << "\"depth_stencil_attachment\":{" << std::endl;
+                buffer << "\"attachement\":"
+                       << info.pSubpasses[i].pDepthStencilAttachment->attachment << ","
+                       << std::endl;
+                buffer << "\"layout\":" << info.pSubpasses[i].pDepthStencilAttachment->layout
+                       << std::endl;
+                buffer << "}";
+            }
+
+            //------------Resolve-------------------
+            if (info.pSubpasses[i].pResolveAttachments) {
+                buffer << "," << std::endl;
+                buffer << "\"resolve_attachments\":[" << std::endl;
+                for (uint32_t j = 0; j < info.pSubpasses[i].colorAttachmentCount; ++j) {
+                    buffer << "{" << std::endl;
+                    buffer << "\"attachement\":"
+                           << info.pSubpasses[i].pResolveAttachments[j].attachment << ","
+                           << std::endl;
+                    buffer << "\"layout\":" << info.pSubpasses[i].pResolveAttachments[j].layout
+                           << std::endl;
+                    buffer << "}" << std::endl;
+                    if (j < info.pSubpasses[i].colorAttachmentCount - 1) {
+                        buffer << ",";
+                    }
+                    buffer << std::endl;
+                }
+                buffer << "]";
+            }
+
+            //------------Color-------------------
+            if (info.pSubpasses[i].pColorAttachments) {
+                buffer << "," << std::endl;
+                buffer << "\"color_attachments\":[" << std::endl;
+                for (uint32_t j = 0; j < info.pSubpasses[i].colorAttachmentCount; ++j) {
+                    buffer << "{" << std::endl;
+                    buffer << "\"attachement\":"
+                           << info.pSubpasses[i].pColorAttachments[j].attachment << ","
+                           << std::endl;
+                    buffer << "\"layout\":" << info.pSubpasses[i].pColorAttachments[j].layout
+                           << std::endl;
+                    buffer << "}" << std::endl;
+                    if (j < info.pSubpasses[i].colorAttachmentCount - 1) {
+                        buffer << ",";
+                    }
+                    buffer << std::endl;
+                }
+                buffer << "]";
+            }
+
+            //------------Input-------------------
+            if (info.pSubpasses[i].pInputAttachments) {
+                buffer << "," << std::endl;
+                buffer << "\"input_attachments\":[" << std::endl;
+                for (uint32_t j = 0; j < info.pSubpasses[i].inputAttachmentCount; ++j) {
+                    buffer << "{" << std::endl;
+                    buffer << "\"attachement\":"
+                           << info.pSubpasses[i].pInputAttachments[j].attachment << ","
+                           << std::endl;
+                    buffer << "\"layout\":" << info.pSubpasses[i].pInputAttachments[j].layout
+                           << std::endl;
+                    buffer << "}" << std::endl;
+                    if (j < info.pSubpasses[i].inputAttachmentCount - 1) {
+                        buffer << ",";
+                    }
+                    buffer << std::endl;
+                }
+                buffer << "]" << std::endl;
+            }
+
+            buffer << "}";
+            if (i < info.subpassCount - 1) {
+                buffer << ",";
+            }
+            buffer << std::endl;
+        }
+        buffer << "]" << std::endl;
+
+        buffer << "}";
+        file << buffer.str();
+    }
+    file.close();
+}
+}

filament/backend/src/vulkan/VulkanRenderPassStateSerializer.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef TNT_FILAMENT_BACKEND_VULKANRENDERPASSSTATESERIALIZER_H
+#define TNT_FILAMENT_BACKEND_VULKANRENDERPASSSTATESERIALIZER_H
+
+#include "VulkanCommands.h"
+
+#include <backend/DriverEnums.h>
+#include <backend/TargetBufferInfo.h>
+
+#include <bluevk/BlueVK.h>
+#include <iostream>
+#include <type_traits>
+#include <sstream>
+#include <vector>
+
+namespace filament::backend {
+
+class VulkanRenderPassStateSerializer {
+public:
+    VulkanRenderPassStateSerializer(VulkanRenderPassStateSerializer const&) = delete;
+    VulkanRenderPassStateSerializer& operator=(VulkanRenderPassStateSerializer const&) = delete;
+
+    VulkanRenderPassStateSerializer(const VkRenderPassCreateInfo& info, uint32_t key);
+};
+} // namespace filament::backend
+
+#endif //TNT_FILAMENT_BACKEND_VULKANRENDERPASSSTATESERIALIZER_H

filament/backend/src/vulkan/VulkanSamplerCache.cpp

@@ -21,12 +21,14 @@
 
 #include <utils/Panic.h>
 
+#include "VulkanSamplerStateSerializer.h"
+
 using namespace bluevk;
 
 namespace filament::backend {
 
-VulkanSamplerCache::VulkanSamplerCache(VkDevice device)
-    : mDevice(device) {}
+VulkanSamplerCache::VulkanSamplerCache(VkDevice device, VulkanYcbcrConversionCache* conversionCache)
+    : mDevice(device), mConversionCache(conversionCache) {}
 
 VkSampler VulkanSamplerCache::getSampler(Params params) {
     auto iter = mCache.find(params);
@@ -57,11 +59,16 @@ VkSampler VulkanSamplerCache::getSampler(Params params) {
         .borderColor = VK_BORDER_COLOR_INT_OPAQUE_BLACK,
         .unnormalizedCoordinates = VK_FALSE,
     };
+    VulkanSamplerStateSerializer samplerSer(params,
+            params.conversion != VK_NULL_HANDLE ? mConversionCache->getKey(params.conversion) : 0);
+
     VkSampler sampler;
     VkResult result = vkCreateSampler(mDevice, &samplerInfo, VKALLOC, &sampler);
     FILAMENT_CHECK_POSTCONDITION(result == VK_SUCCESS) << "Unable to create sampler."
                                                        << " error=" << static_cast<int32_t>(result);
     mCache.insert({ params, sampler });
+    SamplerHashFn hashFn;
+    mSamplerToKey[sampler] = hashFn(params);
     return sampler;
 }
 

filament/backend/src/vulkan/VulkanSamplerCache.h

@@ -17,9 +17,11 @@
 #ifndef TNT_FILAMENT_BACKEND_VULKANSAMPLERCACHE_H
 #define TNT_FILAMENT_BACKEND_VULKANSAMPLERCACHE_H
 
+#include "VulkanYcbcrConversionCache.h"
 #include <backend/DriverEnums.h>
 
 #include <utils/Hash.h>
+#include <map>
 
 #include <bluevk/BlueVK.h>
 #include <tsl/robin_map.h>
@@ -37,11 +39,20 @@ public:
 
     static_assert(sizeof(Params) == 16);
 
-    explicit VulkanSamplerCache(VkDevice device);
+    explicit VulkanSamplerCache(VkDevice device, VulkanYcbcrConversionCache* conversionCache);
     VkSampler getSampler(Params params);
+    uint32_t getKey(VkSampler sampler) {
+        uint32_t key = 0;
+        auto iter = mSamplerToKey.find(sampler);
+        if (iter != mSamplerToKey.end()) {
+            key = iter->second;
+        }
+        return key;
+    }
     void terminate() noexcept;
 private:
     VkDevice mDevice;
+    VulkanYcbcrConversionCache* mConversionCache;
 
     struct SamplerEqualTo {
         bool operator()(Params lhs, Params rhs) const noexcept {
@@ -51,6 +62,7 @@ private:
     };
     using SamplerHashFn = utils::hash::MurmurHashFn<Params>;
     tsl::robin_map<Params, VkSampler, SamplerHashFn, SamplerEqualTo> mCache;
+    std::map<VkSampler, uint32_t> mSamplerToKey;
 };
 
 } // namespace filament::backend

filament/backend/src/vulkan/VulkanSamplerStateSerializer.cpp

@@ -0,0 +1,64 @@
+#include "VulkanSamplerStateSerializer.h"
+#include <fstream>
+#include <sstream>
+#include <utils/Hash.h>
+
+namespace filament::backend {
+VulkanYcbcrConversionSerializer::VulkanYcbcrConversionSerializer(
+        const VulkanYcbcrConversionCache::Params& params) {
+    using ConversionHashFn = utils::hash::MurmurHashFn<VulkanYcbcrConversionCache::Params>;
+    ConversionHashFn hashFn;
+    uint32_t key = hashFn(params);
+    std::stringstream filename;
+    filename << "ycbcr_conv_" << key << ".json";
+
+    std::ofstream file(filename.str());
+    if (file.is_open()) {
+        std::stringstream buffer;
+        auto const& chroma = params.conversion;
+        buffer << "{" << std::endl;
+        buffer << "\"format\":" << params.format << "," << std::endl;
+        buffer << "\"external_format\":" << params.externalFormat << "," << std::endl;
+        buffer << "\"ycbcr_model\":" << uint8_t(chroma.ycbcrModel) << "," << std::endl;
+        buffer << "\"ycbcr_range\":" << uint8_t(chroma.ycbcrRange) << "," << std::endl;
+        buffer << "\"swizzle_array\":[" << uint8_t(chroma.r) << "," << uint8_t(chroma.g) << ","
+               << uint8_t(chroma.b) << "," << uint8_t(chroma.a) << "]," << std::endl;
+        buffer << "\"x_chroma_offset\":" << uint8_t(chroma.xChromaOffset) << "," << std::endl;
+        buffer << "\"y_chroma_offset\":" << uint8_t(chroma.yChromaOffset) << "," << std::endl;
+        buffer << "\"chroma_filter\":" << uint8_t(chroma.chromaFilter) << std::endl;
+        buffer << "}" << std::endl;
+
+        file << buffer.str();
+    }
+    file.close();
+}
+
+VulkanSamplerStateSerializer::VulkanSamplerStateSerializer(const VulkanSamplerCache::Params& params, uint32_t ycbcr_conv_key) {
+    using ConversionHashFn = utils::hash::MurmurHashFn<VulkanSamplerCache::Params>;
+    ConversionHashFn hashFn;
+    uint32_t key = hashFn(params);
+    std::stringstream filename;
+    filename << "sampler_" << key << ".json";
+
+    std::ofstream file(filename.str());
+    if (file.is_open()) {
+        std::stringstream buffer;
+        auto const& samplerParams = params.sampler;
+        buffer << "{" << std::endl;
+        buffer << "\"filter_mag\":" << uint32_t(samplerParams.filterMag) << "," << std::endl;
+        buffer << "\"filter_min\":" << uint32_t(samplerParams.filterMin) << "," << std::endl;
+        buffer << "\"wrap_s\":" << uint32_t(samplerParams.wrapS) << "," << std::endl;
+        buffer << "\"wrap_t\":" << uint32_t(samplerParams.wrapT) << "," << std::endl;
+        buffer << "\"wrap_r\":" << uint32_t(samplerParams.wrapR) << "," << std::endl;
+        buffer << "\"anisotropy_log2\":" << uint32_t(samplerParams.anisotropyLog2) << "," << std::endl;
+        buffer << "\"compare_mode\":" << uint32_t(samplerParams.compareMode) << "," << std::endl;
+        buffer << "\"compare_func\":" << uint32_t(samplerParams.compareFunc) << "," << std::endl;
+        buffer << "\"ycbcr_conv_key\":" << ycbcr_conv_key << std::endl;
+        buffer << "}" << std::endl;
+
+        file << buffer.str();
+    }
+    file.close();
+}
+
+} // namespace filament::backend

filament/backend/src/vulkan/VulkanSamplerStateSerializer.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef TNT_FILAMENT_BACKEND_VULKANSAMPLERSTATESERIALIZER_H
+#define TNT_FILAMENT_BACKEND_VULKANSAMPLERSTATESERIALIZER_H
+
+#include <backend/DriverEnums.h>
+#include "VulkanYcbcrConversionCache.h"
+#include "VulkanSamplerCache.h"
+
+#include <bluevk/BlueVK.h>
+#include <vector>
+#include <iostream>
+#include <sstream>
+
+namespace filament::backend {
+
+class VulkanYcbcrConversionSerializer {
+public:
+    VulkanYcbcrConversionSerializer(VulkanYcbcrConversionSerializer const&) = delete;
+    VulkanYcbcrConversionSerializer& operator=(VulkanYcbcrConversionSerializer const&) = delete;
+
+    VulkanYcbcrConversionSerializer(const VulkanYcbcrConversionCache::Params& params);
+};
+        // VulkanPipelineStateSerializer stores to a file the pipeline states.
+class VulkanSamplerStateSerializer {
+public:
+    VulkanSamplerStateSerializer(VulkanSamplerStateSerializer const&) = delete;
+    VulkanSamplerStateSerializer& operator=(VulkanSamplerStateSerializer const&) = delete;
+
+    VulkanSamplerStateSerializer(const VulkanSamplerCache::Params& params, uint32_t ycbcr_conv_key);
+};
+}
+
+#endif //TNT_FILAMENT_BACKEND_VULKANSAMPLERSTATESERIALIZER_H

filament/backend/src/vulkan/VulkanYcbcrConversionCache.cpp

@@ -15,6 +15,7 @@
  */
 
 #include "VulkanYcbcrConversionCache.h"
+#include "VulkanSamplerStateSerializer.h"
 
 #include "vulkan/VulkanConstants.h"
 #include "vulkan/utils/Conversion.h"
@@ -53,6 +54,7 @@ VkSamplerYcbcrConversion VulkanYcbcrConversionCache::getConversion(
         .yChromaOffset = fvkutils::getChromaLocation(chroma.yChromaOffset),
         .chromaFilter = fvkutils::getFilter(chroma.chromaFilter),
     };
+    VulkanYcbcrConversionSerializer ycbcr_ser(params);
 
     // We could put this in the platform class, but that seems like a bit of an overkill
 #if defined(__ANDROID__)
@@ -73,6 +75,8 @@ VkSamplerYcbcrConversion VulkanYcbcrConversionCache::getConversion(
                                                        << " error=" << static_cast<int32_t>(result);
 
     mCache.insert({ params, conversion });
+    ConversionHashFn hashFn;
+    mConversionToKey[conversion] = hashFn(params);
     return conversion;
 }
 

filament/backend/src/vulkan/VulkanYcbcrConversionCache.h

@@ -25,6 +25,7 @@
 
 #include <bluevk/BlueVK.h>
 #include <tsl/robin_map.h>
+#include <map>
 
 namespace filament::backend {
 
@@ -40,6 +41,14 @@ public:
 
     explicit VulkanYcbcrConversionCache(VkDevice device);
     VkSamplerYcbcrConversion getConversion(Params params);
+    uint32_t getKey(VkSamplerYcbcrConversion conv) { 
+        uint32_t key = 0;
+        auto iter = mConversionToKey.find(conv);
+        if (iter != mConversionToKey.end()) {
+            key = iter->second;
+        }
+        return key;
+    }
     void terminate() noexcept;
 
 private:
@@ -54,6 +63,7 @@ private:
     };
     using ConversionHashFn = utils::hash::MurmurHashFn<Params>;
     tsl::robin_map<Params, VkSamplerYcbcrConversion, ConversionHashFn, ConversionEqualTo> mCache;
+    std::map<VkSamplerYcbcrConversion, uint32_t> mConversionToKey;
 };
 
 } // namespace filament::backend