X-Git-Url: https://git.artsoft.org/?a=blobdiff_plain;f=src%2Ftape.c;h=5e7bca1539bc172b7bdbc83b123e78f61d2a883b;hb=a99a1803e5097bc598b4c6f73259715da148ab27;hp=4894f1137bc9fb54fec3b5e7b81c03bcfae4fc56;hpb=311daa0f9ad23b7a9b53b979226a4a51942c084f;p=rocksndiamonds.git

diff --git a/src/tape.c b/src/tape.c
index 4894f113..5e7bca15 100644
--- a/src/tape.c
+++ b/src/tape.c
@@ -35,13 +35,16 @@
 
 // values for tape handling
 #define TAPE_PAUSE_SECONDS_BEFORE_DEATH		5
+#define TAPE_MIN_SECONDS_FOR_UNDO_BUFFER	20
 
 // forward declaration for internal use
 static void HandleTapeButtons(struct GadgetInfo *);
 static void TapeStopWarpForward(void);
 static float GetTapeLengthSecondsFloat(void);
+static void CopyTapeToUndoBuffer(void);
 
 static struct GadgetInfo *tape_gadget[NUM_TAPE_BUTTONS];
+static struct TapeInfo tape_undo_buffer;
 
 
 // ============================================================================
@@ -528,6 +531,8 @@ void TapeErase(void)
 {
   int i;
 
+  CopyTapeToUndoBuffer();
+
   tape.counter = 0;
   tape.length = 0;
   tape.length_frames = 0;
@@ -889,10 +894,10 @@ byte *TapePlayAction(void)
     action[i] = tape.pos[tape.counter].action[i];
 
 #if DEBUG_TAPE_WHEN_PLAYING
-  printf("%05d", FrameCounter);
+  Print("%05d", FrameCounter);
   for (i = 0; i < MAX_TAPE_ACTIONS; i++)
-    printf("   %08x", action[i]);
-  printf("\n");
+    Print("   %08x", action[i]);
+  Print("\n");
 #endif
 
   tape.set_centered_player = FALSE;
@@ -1145,6 +1150,73 @@ boolean PlaySolutionTape(void)
   return TRUE;
 }
 
+static boolean checkTapesFromSameLevel(struct TapeInfo *t1, struct TapeInfo *t2)
+{
+  return (strEqual(t1->level_identifier, t2->level_identifier) &&
+	  t1->level_nr == t2->level_nr);
+}
+
+static void CopyTape(struct TapeInfo *tape_from, struct TapeInfo *tape_to)
+{
+  if (tape_to->level_identifier != NULL)
+    checked_free(tape_to->level_identifier);
+
+  *tape_to = *tape_from;
+
+  tape_to->level_identifier = getStringCopy(tape_from->level_identifier);
+}
+
+static void SwapTapes(struct TapeInfo *t1, struct TapeInfo *t2)
+{
+  struct TapeInfo tmp = *t1;
+
+  *t1 = *t2;
+  *t2 = tmp;
+}
+
+static void CopyTapeToUndoBuffer(void)
+{
+  // copy tapes to undo buffer if large enough (or larger than last undo tape)
+  // or if the last undo tape is from a different level set or level number
+  if (tape.length_seconds >= TAPE_MIN_SECONDS_FOR_UNDO_BUFFER ||
+      tape.length_seconds >= tape_undo_buffer.length_seconds ||
+      !checkTapesFromSameLevel(&tape, &tape_undo_buffer))
+  {
+    CopyTape(&tape, &tape_undo_buffer);
+  }
+}
+
+void UndoTape(void)
+{
+  // only undo tapes from same level set and with same level number
+  if (!checkTapesFromSameLevel(&tape, &tape_undo_buffer))
+    return;
+
+  if (!TAPE_IS_STOPPED(tape))
+    TapeStop();
+
+  // swap last recorded tape with undo buffer, so undo can be reversed
+  SwapTapes(&tape, &tape_undo_buffer);
+
+  DrawCompleteVideoDisplay();
+}
+
+void FixTape_ForceSinglePlayer(void)
+{
+  int i;
+
+  /* fix single-player tapes that contain player input for more than one
+     player (due to a bug in 3.3.1.2 and earlier versions), which results
+     in playing levels with more than one player in multi-player mode,
+     even though the tape was originally recorded in single-player mode */
+
+  // remove player input actions for all players but the first one
+  for (i = 1; i < MAX_PLAYERS; i++)
+    tape.player_participates[i] = FALSE;
+
+  tape.changed = TRUE;
+}
+
 
 // ----------------------------------------------------------------------------
 // tape autoplay functions