From 45bec8812c9d5aa1065cf36a8ca878fda5a6b325 Mon Sep 17 00:00:00 2001
From: batsumaru <>
Date: Wed, 19 Aug 2026 20:38:28 +0900
Subject: Added SimState

---
 include/sim_core.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 include/sim_core.h

(limited to 'include/sim_core.h')

diff --git a/include/sim_core.h b/include/sim_core.h
new file mode 100644
index 0000000..88533d0
--- /dev/null
+++ b/include/sim_core.h
@@ -0,0 +1,17 @@
+#ifndef SIM_CORE_H
+#define SIM_CORE_H
+
+#include <type_traits>
+#include "fixed_point.h"
+
+struct SimState {
+    fp_t stage_width;
+    fp_t stage_height;
+    fp_t camera_x;
+    fp_t camera_y;
+};
+
+static_assert(std::is_trivially_copyable_v<SimState>, "SimState must be trivially copyable for rollback");
+static_assert(sizeof(SimState) == 16, "SimState size changed unexpectedly");
+
+#endif // !SIM_CORE_H
-- 
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