Shader caching (#2432)

* Changed all getEntryPointCode calls to use RendererBase::getEntryPointCodeFromShaderCache

* Hashing hooked up, tests pass but need to add more to fully test functionality

* checkpoint

* Checkpoint: File system creation seems functional, saving is broken

* checkpoint: Fixed filename generation from MD5 hash, shader blob might be going missing ahead of pipeline state creation

* Fixed a lot of bugs related to hash code generation, shader cache is likely working but needs further testing

* Added workaround for module loading by re-creating the test device, shader cache test functional

* Vulkan shader caching bug fixed, checkpoint commit before more refinement

* pre-ToT merge checkpoint

* checkpoint commit, improving cache keys

* Significantly expanded items included in the dependency hash for Module; Added dependency hash functions to SpecializedComponentType and RenamedEntryPointComponentType

* Temporarily disable shader cache test

* Mid cleanup changes, solution successfully builds

* Added several helper update functions to slang-md5 to help simplify usage; Added a function under ISession to compute a hash for all linkage-related items; Function renames and cleaned up some comments

* Ran premake.bat; Renamed getASTBasedHashCode to computeASTBasedHash

* Added slang unit tests for Checksum and MD5; Extended gfx shader cache test to test with multiple shader files and one shader file with multiple entry points

* Solution builds and shader cache tests pass, but at least a couple other tests now failing

* ran premake.bat

* More cleanup changes

* Added shaderCachePath field to IDevice desc in gfx.slang, gfx-smoke.slang should be functional

* ran premake

* cleanup changes; Adding test printf to getEntryPointCodeFromShaderCache to see if output can be seen in CI

* Removed debugging printfs; Added handling for getEntryPointCode() failing

* Cleanup changes; Jonathan's fixes to SerialWriter to zero initialize otherwise uninitialized memory; Change to SwizzleExpr creation to zero initialize elementCount

* Changed enable_if_t to enable_if

* Fixed enable_if

* Added test for import vs include and changes to included and imported files; Fixed build errors in CUDA; Renamed shader cache statistics fields

* cleanup changes

* Readd removed file

* Restructured computeDependencyBasedHash calls, added computeDependencyBasedHashImpl to all classes dervied from ComponentType

* Applied same restructuring to the AST hash functions

* Cleanup changes; Moved HashBuilder out to slang-digest.h and added some helper functions to streamline the process of adding items to a hash

* Cleanup; Fixed incorrect expected results for shader import and include test

1 files changed, 13 insertions, 4 deletions

diff --git a/source/slang/slang-serialize.cpp b/source/slang/slang-serialize.cpp
index 71ef303b7..9b63d47c5 100644
--- a/source/slang/slang-serialize.cpp
+++ b/source/slang/slang-serialize.cpp
@@ -210,10 +210,11 @@ SerialClasses::SerialClasses():
 
 // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! SerialWriter  !!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
-SerialWriter::SerialWriter(SerialClasses* classes, SerialFilter* filter) :
-    m_arena(2048),
-    m_classes(classes),
-    m_filter(filter)
+SerialWriter::SerialWriter(SerialClasses* classes, SerialFilter* filter, Flags flags)
+    : m_arena(2048)
+    , m_classes(classes)
+    , m_filter(filter)
+    , m_flags(flags)
 {
     // 0 is always the null pointer
     m_entries.add(nullptr);
@@ -236,6 +237,7 @@ SerialIndex SerialWriter::writeObject(const SerialClass* serialCls, const void*
 
     nodeEntry->typeKind = serialCls->typeKind;
     nodeEntry->subType = serialCls->subType;
+    nodeEntry->_pad0 = 0;
 
     nodeEntry->info = SerialInfo::makeEntryInfo(serialCls->alignment);
 
@@ -244,6 +246,12 @@ SerialIndex SerialWriter::writeObject(const SerialClass* serialCls, const void*
 
     // Point to start of payload
     uint8_t* serialPayload = (uint8_t*)(nodeEntry + 1);
+
+    if (m_flags & Flag::ZeroInitialize)
+    {
+        ::memset(serialPayload, 0, serialCls->size);
+    }
+
     while (serialCls)
     {
         for (Index i = 0; i < serialCls->fieldsCount; ++i)
@@ -483,6 +491,7 @@ SlangResult SerialWriter::write(Stream* stream)
         for (Index i = 1; i < entriesCount; ++i)
         {
             SerialInfo::Entry* next = entries[i + 1];
+
             // Before writing we need to store the next alignment
 
             const size_t nextAlignment = SerialInfo::getAlignment(next->info);