Implement player extrapolation.

If a player doesn't send client frames fast enough then there will be some server frames where they don't move. This is visible as 'warping' and is generally very undesirable. Extrapolation tries to fix the problem by filling in the missing data by continuing player's trajectory.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/game/g_local.h b/src/game/g_local.h
index a3c02c8..28bd059 100644
--- a/src/game/g_local.h
+++ b/src/game/g_local.h
@@ -450,6 +450,13 @@ typedef struct unlagged_s {
   qboolean    used;
 } unlagged_t;
 
+#define MAX_SAVED_POSITIONS 3
+typedef struct {
+  vec3_t      origin;
+  int         time;
+  int         client_time;
+} savedPosition_t;
+
 // this structure is cleared on each ClientSpawn(),
 // except for 'client->pers' and 'client->sess'
 struct gclient_s
@@ -550,6 +557,10 @@ struct gclient_s
   int               tkcredits[ MAX_CLIENTS ];
 
   int                 revertCookie;
+
+  qboolean            extrapolate;
+  savedPosition_t     savedPositions[MAX_SAVED_POSITIONS];
+  int                 savedPositionsCount;
 };
 
 
@@ -1391,6 +1402,7 @@ extern  vmCvar_t  g_popularMapsVotePercent;
 extern  vmCvar_t  g_banIPs;
 extern  vmCvar_t  g_filterBan;
 extern  vmCvar_t  g_smoothClients;
+extern  vmCvar_t  g_debugExtrapolation;
 extern  vmCvar_t  g_outdatedClientMessage;
 extern  vmCvar_t  pmove_fixed;
 extern  vmCvar_t  pmove_msec;