From 4cea57335d11201c0c7eedc1dd15bdd56538b99f Mon Sep 17 00:00:00 2001
From: havoc <havoc@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Thu, 18 Nov 2010 15:47:52 +0000
Subject: [PATCH] for purposes of better compatibility with proquake servers,
 darkplaces client now pretends to be proquake 3.40 when connecting to quake
 protocol servers, this enables precise aim and the proquake NAT fix (which
 the server only supports on proquake clients...  grr)

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@10607 d7cf8633-e32d-0410-b094-e92efae38249
---
 cl_input.c | 14 +++++++++++---
 client.h   |  5 +++++
 netconn.c  | 24 ++++++++++++++++++++++++
 3 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/cl_input.c b/cl_input.c
index 86596afa..256a2f72 100644
--- a/cl_input.c
+++ b/cl_input.c
@@ -1914,9 +1914,17 @@ void CL_SendMove(void)
 			// 5 bytes
 			MSG_WriteByte (&buf, clc_move);
 			MSG_WriteFloat (&buf, cl.cmd.time); // last server packet time
-			// 3 bytes
-			for (i = 0;i < 3;i++)
-				MSG_WriteAngle8i (&buf, cl.cmd.viewangles[i]);
+			// 3 bytes (6 bytes in proquake)
+			if (cls.proquake_servermod == 1) // MOD_PROQUAKE
+			{
+				for (i = 0;i < 3;i++)
+					MSG_WriteAngle16i (&buf, cl.cmd.viewangles[i]);
+			}
+			else
+			{
+				for (i = 0;i < 3;i++)
+					MSG_WriteAngle8i (&buf, cl.cmd.viewangles[i]);
+			}
 			// 6 bytes
 			MSG_WriteCoord16i (&buf, cl.cmd.forwardmove);
 			MSG_WriteCoord16i (&buf, cl.cmd.sidemove);
diff --git a/client.h b/client.h
index 3fcec6a2..f3d1ccce 100644
--- a/client.h
+++ b/client.h
@@ -718,6 +718,11 @@ typedef struct client_static_s
 
 	// crypto channel
 	crypto_t crypto;
+
+	// ProQuake compatibility stuff
+	int proquake_servermod; // 0 = not proquake, 1 = proquake
+	int proquake_serverversion; // actual proquake server version * 10 (3.40 = 34, etc)
+	int proquake_serverflags; // 0 (PQF_CHEATFREE not supported)
 }
 client_static_t;
 
diff --git a/netconn.c b/netconn.c
index 2c1d03ee..3253b798 100755
--- a/netconn.c
+++ b/netconn.c
@@ -2037,6 +2037,21 @@ static int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, unsigned char *dat
 				lhnetaddress_t clientportaddress;
 				clientportaddress = *peeraddress;
 				LHNETADDRESS_SetPort(&clientportaddress, MSG_ReadLong());
+				// extra ProQuake stuff
+				if (length >= 6)
+					cls.proquake_servermod = MSG_ReadByte(); // MOD_PROQUAKE
+				else
+					cls.proquake_servermod = 0;
+				if (length >= 7)
+					cls.proquake_serverversion = MSG_ReadByte(); // version * 10
+				else
+					cls.proquake_serverversion = 0;
+				if (length >= 8)
+					cls.proquake_serverflags = MSG_ReadByte(); // flags (mainly PQF_CHEATFREE)
+				else
+					cls.proquake_serverflags = 0;
+				if (cls.proquake_servermod == 1)
+					Con_Printf("Connected to ProQuake %.1f server, enabling precise aim\n", cls.proquake_serverversion / 10.0f);
 				// update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
 				InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
 				M_Update_Return_Reason("Accepted");
@@ -2217,6 +2232,15 @@ void NetConn_ClientFrame(void)
 		MSG_WriteByte(&net_message, CCREQ_CONNECT);
 		MSG_WriteString(&net_message, "QUAKE");
 		MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
+		// extended proquake stuff
+		MSG_WriteByte(&net_message, 1); // mod = MOD_PROQUAKE
+		// this version matches ProQuake 3.40, the first version to support
+		// the NAT fix, and it only supports the NAT fix for ProQuake 3.40 or
+		// higher clients, so we pretend we are that version...
+		MSG_WriteByte(&net_message, 34); // version * 10
+		MSG_WriteByte(&net_message, 0); // flags
+		MSG_WriteLong(&net_message, 0); // password
+		// write the packetsize now...
 		StoreBigLong(net_message.data, NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 		NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
 		SZ_Clear(&net_message);
-- 
2.39.2