From e2479261c56c8d1a64b51ad4f084ad3c18505359 Mon Sep 17 00:00:00 2001
From: LaG1924 <12997935+LaG1924@users.noreply.github.com>
Date: Sun, 27 Jan 2019 10:10:33 +0500
Subject: GameState double-buffering

---
 src/GlobalState.cpp | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'src/GlobalState.cpp')

diff --git a/src/GlobalState.cpp b/src/GlobalState.cpp
index 9675d4b..afa1a56 100644
--- a/src/GlobalState.cpp
+++ b/src/GlobalState.cpp
@@ -9,6 +9,7 @@
 //Global game variables
 std::unique_ptr<NetworkClient> nc;
 std::unique_ptr<GameState> gs;
+std::shared_ptr<GameState> gsReadOnly;
 std::unique_ptr<Render> render;
 bool isRunning;
 bool isPhysRunning;
@@ -16,6 +17,7 @@ EventListener listener;
 bool isMoving[5] = { 0,0,0,0,0 };
 std::thread threadPhys;
 State state;
+std::mutex gsCopyMutex;
 
 void PhysExec();
 
@@ -194,6 +196,10 @@ void PhysExec() {
 
 		listener.HandleAllEvents();
 
+		gsCopyMutex.lock();
+		gsReadOnly = std::make_shared<GameState>(*gs.get());
+		gsCopyMutex.unlock();
+
         timer.Update();
     }
 }
@@ -212,8 +218,9 @@ void GlobalState::Exec() {
     render.reset();
 }
 
-GameState *GlobalState::GetGameState() {
-    return gs.get();
+std::shared_ptr<GameState> GlobalState::GetGameState() {
+	std::lock_guard<std::mutex> guard(gsCopyMutex);
+	return gsReadOnly;
 }
 
 Render *GlobalState::GetRender() {
-- 
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