Add support for extended CMD_BACKUP/MASK

src/cgame/cg_public.h

@@ -30,6 +30,9 @@ If you have questions concerning this license or the applicable additional terms
 
 #define CMD_BACKUP          64
 #define CMD_MASK            ( CMD_BACKUP - 1 )
+
+#define CMD_BACKUP_EXT      128
+#define CMD_MASK_EXT        ( CMD_BACKUP_EXT - 1 )
 // allow a lot of command backups for very fast systems
 // multiple commands may be combined into a single packet, so this
 // needs to be larger than PACKET_BACKUP
@@ -273,6 +276,8 @@ typedef enum {
 	CG_R_ADDLINEARLIGHTTOSCENE,
 	CG_PC_REMOVE_ALL_GLOBAL_DEFINES,
 	CG_GETCLIPBOARDDATA,
+	CG_CMDBACKUP_EXT,
+
 	CG_TRAP_GETVALUE = COM_TRAP_GETVALUE,
 #endif
 

src/client/cl_cgame.c

@@ -124,11 +124,11 @@ static qboolean CL_GetUserCmd( int cmdNumber, usercmd_t *ucmd ) {
 
 	// the usercmd has been overwritten in the wrapping
 	// buffer because it is too far out of date
-	if ( cl.cmdNumber - cmdNumber >= CMD_BACKUP ) {
+	if ( cl.cmdNumber - cmdNumber >= cl.cmdBackup ) {
 		return qfalse;
 	}
 
-	*ucmd = cl.cmds[ cmdNumber & CMD_MASK ];
+	*ucmd = cl.cmds[ cmdNumber & cl.cmdMask ];
 
 	return qtrue;
 }
@@ -684,6 +684,11 @@ static qboolean CL_CG_GetValue( char* value, int valueSize, const char* key ) {
 		return qtrue;
 	}
 
+	if ( !Q_stricmp( key, "trap_CmdBackup_Ext_Legacy" ) ) {
+		Com_sprintf( value, valueSize, "%i", CG_CMDBACKUP_EXT );
+		return qtrue;
+	}
+
 	return qfalse;
 }
 
@@ -1200,6 +1205,11 @@ static intptr_t CL_CgameSystemCalls( intptr_t *args ) {
 		CL_GetClipboardData( VMA(1), args[2] );
 		return 0;
 
+	case CG_CMDBACKUP_EXT:
+		cl.cmdBackup = CMD_BACKUP_EXT;
+		cl.cmdMask = CMD_MASK_EXT;
+		return 0;
+
 	case CG_TRAP_GETVALUE:
 		return CL_CG_GetValue( VMA(1), args[2], VMA(3) );
 

src/client/cl_input.c

@@ -779,7 +779,7 @@ static void CL_CreateNewCommands( void ) {
 
 	// generate a command for this frame
 	cl.cmdNumber++;
-	cmdNum = cl.cmdNumber & CMD_MASK;
+	cmdNum = cl.cmdNumber & cl.cmdMask;
 	cl.cmds[cmdNum] = CL_CreateCmd();
 }
 
@@ -939,7 +939,7 @@ void CL_WritePacket( void ) {
 
 		// write all the commands, including the predicted command
 		for ( i = 0 ; i < count ; i++ ) {
-			j = (cl.cmdNumber - count + i + 1) & CMD_MASK;
+			j = (cl.cmdNumber - count + i + 1) & cl.cmdMask;
 			cmd = &cl.cmds[j];
 			MSG_WriteDeltaUsercmdKey (&buf, key, oldcmd, cmd);
 			oldcmd = cmd;

src/client/cl_main.c

@@ -1309,6 +1309,9 @@ void CL_ClearState( void ) {
 //	S_StopAllSounds();
 
 	Com_Memset( &cl, 0, sizeof( cl ) );
+
+	cl.cmdBackup = CMD_BACKUP;
+	cl.cmdMask = CMD_MASK;
 }
 
 /*

src/client/client.h

@@ -157,9 +157,12 @@ typedef struct {
 
 	// cmds[cmdNumber] is the predicted command, [cmdNumber-1] is the last
 	// properly generated command
-	usercmd_t cmds[CMD_BACKUP];     // each mesage will send several old cmds
-	int cmdNumber;                  // incremented each frame, because multiple
-									// frames may need to be packed into a single packet
+	usercmd_t cmds[CMD_BACKUP_EXT];     // each mesage will send several old cmds
+	int cmdNumber;                      // incremented each frame, because multiple
+	                                    // frames may need to be packed into a single packet
+
+	int cmdBackup;
+	int cmdMask;
 
 	// Arnout: double tapping
 	doubleTap_t doubleTap;