fixed: if a piece failed to rotate the bucket rotated nonetheless

games/tetris/tetris_main.c

@@ -83,6 +83,9 @@ void tetris_main(tetris_variant_t const *const pVariantMethods)
 				tetris_view_setViewMode(pView, TETRIS_VIMO_RUNNING);
 			}
 
+			// helper variable which tells us whether the last move was possible
+			uint8_t bMoveOk = 1;
+
 			// what we do depends on what the input module tells us
 			switch (inCmd)
 			{
@@ -109,22 +112,22 @@ void tetris_main(tetris_variant_t const *const pVariantMethods)
 
 			// player shifted the piece to the left
 			case TETRIS_INCMD_LEFT:
-				tetris_bucket_movePiece(pBucket, TETRIS_BUD_LEFT);
+				bMoveOk = tetris_bucket_movePiece(pBucket, TETRIS_BUD_LEFT);
 				break;
 
 			// player shifted the piece to the right
 			case TETRIS_INCMD_RIGHT:
-				tetris_bucket_movePiece(pBucket, TETRIS_BUD_RIGHT);
+				bMoveOk = tetris_bucket_movePiece(pBucket, TETRIS_BUD_RIGHT);
 				break;
 
 			// player rotated the piece clockwise
 			case TETRIS_INCMD_ROT_CW:
-				tetris_bucket_rotatePiece(pBucket, TETRIS_PC_ROT_CW);
+				bMoveOk = tetris_bucket_rotatePiece(pBucket, TETRIS_PC_ROT_CW);
 				break;
 
 			// player rotated the piece counter clockwise
 			case TETRIS_INCMD_ROT_CCW:
-				tetris_bucket_rotatePiece(pBucket, TETRIS_PC_ROT_CCW);
+				bMoveOk = tetris_bucket_rotatePiece(pBucket, TETRIS_PC_ROT_CCW);
 				break;
 
 			// the player decided to make an immediate drop
@@ -150,7 +153,7 @@ void tetris_main(tetris_variant_t const *const pVariantMethods)
 			}
 
 			// inform variant object about the user's last move
-			pVariantMethods->setLastInput(pVariantData, inCmd);
+			pVariantMethods->setLastInput(pVariantData, inCmd, bMoveOk);
 
 			// inform the input module about the requested bearing of the
 			// variant object

games/tetris/variant_fp.c

@@ -73,21 +73,32 @@ tetris_highscore_index_t tetris_fp_getHighscoreIndex(void *pVariantData)
 	return TETRIS_HISCORE_FP;
 }
 
-
+/**
+ * change bearing depending on player's last input
+ * @param pVariantData the variant data object we want to modify
+ * @param inCmd the last issued command
+ * @param bMoveOk 1 if the last move was possible, otherwise 0
+ */
 void tetris_fp_setLastInput(void *pVariantData,
-                            tetris_input_command_t inCmd)
+                            tetris_input_command_t inCmd,
+                            uint8_t bMoveOk)
 {
 	assert (pVariantData != NULL);
 	tetris_standard_variant_t *pStdVariant =
 			(tetris_standard_variant_t *)pVariantData;
 
-	if (inCmd == TETRIS_INCMD_ROT_CW)
-	{
-		pStdVariant->nBearing += 1;
-	}
-	else if (inCmd == TETRIS_INCMD_ROT_CCW)
+	if (bMoveOk)
 	{
-		pStdVariant->nBearing += 3;
+		if (inCmd == TETRIS_INCMD_ROT_CW)
+		{
+			// piece rotated clockwise -> rotate bucket counter-clockwise
+			pStdVariant->nBearing += 3;
+		}
+		else if (inCmd == TETRIS_INCMD_ROT_CCW)
+		{
+			// piece rotated counter-clockwise -> rotate bucket clockwise
+			pStdVariant->nBearing += 1;
+		}
 	}
 	pStdVariant->nBearing %= 4;
 }