pull out table stripe arrays as base layer primitive; unified 'artifact cache' experiment

src/artifact_cache/artifact_cache.h

@@ -0,0 +1,104 @@
+// Copyright (c) Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+#ifndef ARTIFACT_CACHE_H
+#define ARTIFACT_CACHE_H
+
+////////////////////////////////
+//~ rjf: Artifact Computation Function Types
+
+typedef void *AC_CreateFunctionType(String8 key);
+typedef void AC_DestroyFunctionType(void *artifact);
+
+////////////////////////////////
+//~ rjf: Cache Types
+
+typedef struct AC_Request AC_Request;
+struct AC_Request
+{
+  String8 key;
+  AC_CreateFunctionType *create;
+};
+
+typedef struct AC_RequestNode AC_RequestNode;
+struct AC_RequestNode
+{
+  AC_RequestNode *next;
+  AC_Request v;
+};
+
+typedef struct AC_Node AC_Node;
+struct AC_Node
+{
+  AC_Node *next;
+  AC_Node *prev;
+  
+  // rjf: key/value
+  String8 key;
+  void *val;
+  
+  // rjf: metadata
+  AccessPt access_pt;
+  U64 working_count;
+};
+
+typedef struct AC_Slot AC_Slot;
+struct AC_Slot
+{
+  AC_Node *first;
+  AC_Node *last;
+};
+
+typedef struct AC_Cache AC_Cache;
+struct AC_Cache
+{
+  // rjf: link / key for cache-cache
+  AC_Cache *next;
+  AC_CreateFunctionType *create;
+  AC_DestroyFunctionType *destroy;
+  
+  // rjf: artifact cache
+  U64 slots_count;
+  AC_Slot *slots;
+  StripeArray stripes;
+};
+
+typedef struct AC_Shared AC_Shared;
+struct AC_Shared
+{
+  Arena *arena;
+  
+  // rjf: cache cache
+  U64 cache_slots_count;
+  AC_Cache **cache_slots;
+  StripeArray cache_stripes;
+  
+  // rjf: requests
+  Mutex req_mutex;
+  Arena *req_arena;
+  AC_RequestNode *first_req;
+  AC_RequestNode *last_req;
+  U64 req_count;
+};
+
+////////////////////////////////
+//~ rjf: Globals
+
+global AC_Shared *ac_shared = 0;
+
+////////////////////////////////
+//~ rjf: Layer Initialization
+
+internal void ac_init(void);
+
+////////////////////////////////
+//~ rjf: Cache Lookups
+
+internal void *ac_artifact_from_key(Access *access, String8 key, AC_CreateFunctionType *create, AC_DestroyFunctionType *destroy, U64 slots_count);
+
+////////////////////////////////
+//~ rjf: Tick
+
+internal void ac_tick(void);
+
+#endif // ARTIFACT_CACHE_H