From fc9aff7f068dcef4bbaee9b15d66a54f31ce167e Mon Sep 17 00:00:00 2001
From: jacob <jacob@cagori.com>
Date: Fri, 24 Oct 2025 06:46:34 -0500
Subject: [PATCH] persist struct region

---
 src/base/base.h | 12 +++++++-----
 src/pp/pp.c     | 20 +++-----------------
 src/pp/pp.h     | 24 +++++++++++++++++-------
 3 files changed, 27 insertions(+), 29 deletions(-)

diff --git a/src/base/base.h b/src/base/base.h
index b53f551e..89e13adc 100644
--- a/src/base/base.h
+++ b/src/base/base.h
@@ -424,15 +424,17 @@ void __asan_unpoison_memory_region(void const volatile *add, size_t);
 #define IsArray(a) (IsIndexable(a) && (((void *)&a) == ((void *)a)))
 
 //- offsetof
-#if 0
 #if !CompilerIsMsvc
-# if !defined _CRT_USE_BUILTIN_OFFSETOF
-#  define offsetof(type, field) ((u64)&(((type *)0)->field))
-# else
+# ifdef _CRT_USE_BUILTIN_OFFSETOF
 #  define offsetof(type, field) __builtin_offsetof(type, field)
+# else
+#  define offsetof(type, field) ((u64)&(((type *)0)->field))
 # endif
 #endif
-#endif
+
+//- struct region
+#define StructRegion(name) i8 name
+#define CopyStructRegion(dst, src, r0, r1) CopyBytes(&dst->r0, &src->r0, (u8 *)&dst->r1 - (u8 *)&dst->r0)
 
 //- Packed
 #if CompilerIsMsvc
diff --git a/src/pp/pp.c b/src/pp/pp.c
index 1f4a40d9..78a1fe5b 100644
--- a/src/pp/pp.c
+++ b/src/pp/pp.c
@@ -30,9 +30,10 @@ void StartupUser(void)
     g->local_to_user_client_store = AcquireClientStore();
     g->local_to_user_client = AcquireClient(g->local_to_user_client_store);
 
-    /* Init from swap */
     g->world_to_ui_xf = XformIdentity;
     g->world_to_render_xf = XformIdentity;
+
+    /* Init from swap */
     if (IsSwappingIn());
     {
         TempArena scratch = BeginScratchNoConflict();
@@ -41,22 +42,7 @@ void StartupUser(void)
         {
             SwappedUserState *swap = (SwappedUserState *)swap_str.text;
             SharedUserState *old = &swap->s;
-            g->debug_following          = old->debug_following;
-            g->debug_camera             = old->debug_camera;
-            g->debug_camera_panning     = old->debug_camera_panning;
-            g->debug_camera_pan_start   = old->debug_camera_pan_start;
-            g->debug_draw               = old->debug_draw;
-            g->screen_size              = old->screen_size;
-            g->screen_cursor            = old->screen_cursor;
-            g->ui_to_screen_xf          = old->ui_to_screen_xf;
-            g->ui_size                  = old->ui_size;
-            g->ui_cursor                = old->ui_cursor;
-            g->render_to_ui_xf          = old->render_to_ui_xf;
-            g->render_size              = old->render_size;
-            g->world_to_render_xf       = old->world_to_render_xf;
-            g->world_to_ui_xf           = old->world_to_ui_xf;
-            g->world_cursor             = old->world_cursor;
-            g->focus_send               = old->focus_send;
+            CopyStructRegion(g, old, PERSIST_START, PERSIST_END);
         }
         EndScratch(scratch);
     }
diff --git a/src/pp/pp.h b/src/pp/pp.h
index 153c6465..32287d1e 100644
--- a/src/pp/pp.h
+++ b/src/pp/pp.h
@@ -194,13 +194,6 @@ Struct(SharedUserState)
     //- Bind state
     BindState bind_states[BindKind_Count];
 
-    //- Debug camera
-    EntityId debug_following;
-    b32 debug_camera;
-    b32 debug_camera_panning;
-    Vec2 debug_camera_pan_start;
-    b32 debug_draw;
-
     //- Debug console
     Mutex console_logs_mutex;
     Arena *console_logs_arena;
@@ -245,6 +238,18 @@ Struct(SharedUserState)
     i64 real_dt_ns;
     i64 real_time_ns;
 
+    //////////////////////////////
+    //- Persist start
+    StructRegion(PERSIST_START);
+
+    //- Debug camera
+
+    EntityId debug_following;
+    b32 debug_camera;
+    b32 debug_camera_panning;
+    Vec2 debug_camera_pan_start;
+    b32 debug_draw;
+
     //- Per frame
 
     Vec2I32 screen_size;
@@ -262,6 +267,11 @@ Struct(SharedUserState)
     Vec2 world_cursor;
 
     Vec2 focus_send;
+
+    StructRegion(PERSIST_END);
+    //- Persist end
+    //////////////////////////////
+
 } extern shared_user_state;
 
 ////////////////////////////////////////////////////////////