fix: improve slope boost ensurance cheat

src/Cheats.cpp

@@ -30,7 +30,7 @@ Variable sar_autorecord("sar_autorecord", "0", -1, 1, "Enables or disables autom
 Variable sar_autojump("sar_autojump", "0", "Enables automatic jumping on the server.\n");
 Variable sar_autostrafe("sar_autostrafe", "0", "Automatically strafes in your current wishdir.\n");
 Variable sar_ensure_slope_boost("sar_ensure_slope_boost", "0", "Ensures a successful slope boost.");
-	Variable sar_jumpboost("sar_jumpboost", "0", 0,
+Variable sar_jumpboost("sar_jumpboost", "0", 0,
                        "Enables special game movement on the server.\n"
                        "0 = Default,\n"
                        "1 = Orange Box Engine,\n"
@@ -444,13 +444,17 @@ void Cheats::EnsureSlopeBoost(const CHLMoveData *move, void *player, CGameTrace
 	if (!server->AllowsMovementChanges() || !sar_ensure_slope_boost.GetBool()) {
 		return;
 	}
+
+	Vector velocity = move->m_vecVelocity;
+	Vector hitNormal = (*tr)->plane.normal; 
 
-	bool goingDown = move->m_vecVelocity.z < 0;
+	bool goingDown = velocity.z < 0;
 	bool isntAlreadyGrounded = !(SE(player)->ground_entity());
-	bool landedOnSlope = (*tr)->plane.normal.z < 1.0f;
+	bool landedOnSlope = hitNormal.z < 1.0f;
 	bool wantsToSnapToGround = (*tr)->fraction >= 0.000001f;
+	bool boostingTowardsVelocity = hitNormal.x * velocity.x + hitNormal.y * velocity.y >= 0;
 
-	if (goingDown && isntAlreadyGrounded && landedOnSlope && wantsToSnapToGround) {
+	if (goingDown && isntAlreadyGrounded && landedOnSlope && wantsToSnapToGround && boostingTowardsVelocity) {
 		// Nulling out pointer by reference, so that it's passed in CGameMovement::SetGroundEntity, 
 		// preventing being grounded on this call, letting the player to boost off slope
 		*tr = NULL;