From 76772fd3014cea1fd626270bb9284e19ee49968c Mon Sep 17 00:00:00 2001
From: erwincoumans <erwin.coumans@gmail.com>
Date: Wed, 22 Nov 2017 15:30:56 -0800
Subject: [PATCH] reduce stack usage

---
 examples/SharedMemory/PhysicsDirect.cpp | 38 ++++++++++++++-----------
 1 file changed, 22 insertions(+), 16 deletions(-)

diff --git a/examples/SharedMemory/PhysicsDirect.cpp b/examples/SharedMemory/PhysicsDirect.cpp
index c747ff2fd..6dbac65db 100644
--- a/examples/SharedMemory/PhysicsDirect.cpp
+++ b/examples/SharedMemory/PhysicsDirect.cpp
@@ -29,6 +29,9 @@ struct PhysicsDirectInternalData
 	btAlignedObjectArray<char> m_serverDNA;
 	SharedMemoryCommand m_command;
 	SharedMemoryStatus m_serverStatus;
+
+	SharedMemoryCommand m_tmpInfoRequestCommand;
+	SharedMemoryStatus m_tmpInfoStatus;
 	bool m_hasStatus;
 	bool m_verboseOutput;
 	
@@ -79,6 +82,9 @@ struct PhysicsDirectInternalData
 
 PhysicsDirect::PhysicsDirect(PhysicsCommandProcessorInterface* physSdk, bool passSdkOwnership)
 {
+	int sz = sizeof(SharedMemoryCommand);
+	int sz2 = sizeof(SharedMemoryStatus);
+
 	m_data = new PhysicsDirectInternalData;
 	m_data->m_commandProcessor = physSdk;
 	m_data->m_ownsCommandProcessor = passSdkOwnership;
@@ -814,12 +820,12 @@ void PhysicsDirect::postProcessStatus(const struct SharedMemoryStatus& serverCmd
 		for (int i=0;i<numConstraints;i++)
 		{
 			int constraintUid = serverCmd.m_sdfLoadedArgs.m_userConstraintUniqueIds[i];
-			SharedMemoryCommand infoRequestCommand;
-			infoRequestCommand.m_type = CMD_USER_CONSTRAINT;
-			infoRequestCommand.m_updateFlags = USER_CONSTRAINT_REQUEST_INFO;
-            infoRequestCommand.m_userConstraintArguments.m_userConstraintUniqueId = constraintUid;
-			SharedMemoryStatus infoStatus;
-			bool hasStatus = m_data->m_commandProcessor->processCommand(infoRequestCommand, infoStatus, &m_data->m_bulletStreamDataServerToClient[0], SHARED_MEMORY_MAX_STREAM_CHUNK_SIZE);
+			
+			m_data->m_tmpInfoRequestCommand.m_type = CMD_USER_CONSTRAINT;
+			m_data->m_tmpInfoRequestCommand.m_updateFlags = USER_CONSTRAINT_REQUEST_INFO;
+            m_data->m_tmpInfoRequestCommand.m_userConstraintArguments.m_userConstraintUniqueId = constraintUid;
+			
+			bool hasStatus = m_data->m_commandProcessor->processCommand(m_data->m_tmpInfoRequestCommand, m_data->m_tmpInfoStatus, &m_data->m_bulletStreamDataServerToClient[0], SHARED_MEMORY_MAX_STREAM_CHUNK_SIZE);
 					
 
 			b3Clock clock;
@@ -828,13 +834,13 @@ void PhysicsDirect::postProcessStatus(const struct SharedMemoryStatus& serverCmd
 
 			while ((!hasStatus) && (clock.getTimeInSeconds()-startTime < timeOutInSeconds))
 			{
-				hasStatus = m_data->m_commandProcessor->receiveStatus(infoStatus, &m_data->m_bulletStreamDataServerToClient[0], SHARED_MEMORY_MAX_STREAM_CHUNK_SIZE);
+				hasStatus = m_data->m_commandProcessor->receiveStatus(m_data->m_tmpInfoStatus, &m_data->m_bulletStreamDataServerToClient[0], SHARED_MEMORY_MAX_STREAM_CHUNK_SIZE);
 			}
 
 			if (hasStatus)
 			{
-				int cid = infoStatus.m_userConstraintResultArgs.m_userConstraintUniqueId;
-				m_data->m_userConstraintInfoMap.insert(cid,infoStatus.m_userConstraintResultArgs);
+				int cid = m_data->m_tmpInfoStatus.m_userConstraintResultArgs.m_userConstraintUniqueId;
+				m_data->m_userConstraintInfoMap.insert(cid,m_data->m_tmpInfoStatus.m_userConstraintResultArgs);
 			}
 		}
 
@@ -842,11 +848,11 @@ void PhysicsDirect::postProcessStatus(const struct SharedMemoryStatus& serverCmd
 		for (int i = 0; i<numBodies; i++)
 		{
 			int bodyUniqueId = serverCmd.m_sdfLoadedArgs.m_bodyUniqueIds[i];
-			SharedMemoryCommand infoRequestCommand;
-			infoRequestCommand.m_type = CMD_REQUEST_BODY_INFO;
-			infoRequestCommand.m_sdfRequestInfoArgs.m_bodyUniqueId = bodyUniqueId;
-			SharedMemoryStatus infoStatus;
-			bool hasStatus = m_data->m_commandProcessor->processCommand(infoRequestCommand, infoStatus, &m_data->m_bulletStreamDataServerToClient[0], SHARED_MEMORY_MAX_STREAM_CHUNK_SIZE);
+			
+			m_data->m_tmpInfoRequestCommand.m_type = CMD_REQUEST_BODY_INFO;
+			m_data->m_tmpInfoRequestCommand.m_sdfRequestInfoArgs.m_bodyUniqueId = bodyUniqueId;
+			
+			bool hasStatus = m_data->m_commandProcessor->processCommand(m_data->m_tmpInfoRequestCommand, m_data->m_tmpInfoStatus, &m_data->m_bulletStreamDataServerToClient[0], SHARED_MEMORY_MAX_STREAM_CHUNK_SIZE);
 					
 
 			b3Clock clock;
@@ -855,12 +861,12 @@ void PhysicsDirect::postProcessStatus(const struct SharedMemoryStatus& serverCmd
 
 			while ((!hasStatus) && (clock.getTimeInSeconds()-startTime < timeOutInSeconds))
 			{
-				hasStatus = m_data->m_commandProcessor->receiveStatus(infoStatus, &m_data->m_bulletStreamDataServerToClient[0], SHARED_MEMORY_MAX_STREAM_CHUNK_SIZE);
+				hasStatus = m_data->m_commandProcessor->receiveStatus(m_data->m_tmpInfoStatus, &m_data->m_bulletStreamDataServerToClient[0], SHARED_MEMORY_MAX_STREAM_CHUNK_SIZE);
 			}
 
 			if (hasStatus)
 			{
-				processBodyJointInfo(bodyUniqueId, infoStatus);
+				processBodyJointInfo(bodyUniqueId, m_data->m_tmpInfoStatus);
 			}
 		}
 		break;