Routines
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DFF0: Run Game
Used by the routine at GameEntry.
The main loop of the game. A game starts with the title menu, and then each life is played in the loop from RunGame_Life. When the player loses a life the next player is switched to if there is a second player. When the last life is lost the high score is checked and the game starts again.
Clear the bytes at ScratchValue that the game uses as variables.
RunGame DFF0 LD HL,$5CD8 Clear 30 bytes starting at ScratchValue.
DFF3 LD B,$30
DFF5 CALL ClearBytes
Start a new game from the title menu. Make player 1 the player on the left of the panel, and go to the first level.
RunGame_Loop DFF8 LD A,($E12E) Fetch the flag that shows the scores are swapped.
DFFB AND A Test it.
DFFC CALL NZ,SwitchPlayer_Flip Swap the players back if they were swapped.
DFFF XOR A Set the level number to zero.
E000 LD ($DEDF),A
E003 CALL SetLevelGraphics Set the colours and the shape of the level.
E006 CALL ResetAttributes Reset the attributes of the screen.
E009 CALL ClearScreen Clear the screen.
E00C CALL ShowTitleMenu Show the title menu and wait for the game to be started.
E00F CALL StartGame Set up the lives, the scores, the gauges and the bottles for a new game.
E012 CALL ShowPlayerNumber Show the number of the player.
E015 CALL ResetAttributes Reset the attributes of the screen.
E018 CALL ClearScreen Clear the screen.
E01B CALL DrawPanel Draw the panel.
Colour the window of the game for the level.
RunGame_Loop2 E01E LD HL,$7730 Set HL to the position 7730 of the game window.
E021 LD DE,$E11C Point DE at PanelRectangle.
E024 CALL FillRectangle Colour the window.
Start a life. Draw the icon of each player that shows whether the player has the bottle flag set, putting the icon of the current player on the left.
RunGame_Life E027 LD A,($DEFC) Fetch the bottle flag of the first player and keep it in C.
E02A LD C,A
E02B LD A,($DF1B) Fetch the bottle flag of the second player and keep it in B.
E02E LD B,A
E02F LD A,($DEDD) Fetch the number of the current player.
E032 AND A Test it.
E033 JR Z,RunGame_Pictures Jump to RunGame_Pictures if it is the first player.
E035 LD A,C Swap the flags of the players, so that the flag of the current player is in C.
E036 LD C,B
E037 LD B,A
RunGame_Pictures E038 PUSH BC Stash the flags on the stack.
E039 LD HL,$6808 Set HL to the position 6808 of the icon on the left of the panel.
E03C LD DE,$64BC Point DE at EmptyCupPicture.
E03F LD A,C Fetch the flag for the icon.
E040 AND A Test it.
E041 JR Z,RunGame_LeftIcon Jump to RunGame_LeftIcon if the flag is not set.
E043 LD DE,$6498 Point DE at FilledCupPicture.
RunGame_LeftIcon E046 CALL DrawPicture Draw the icon on the left.
E049 LD L,$E8 Move across to the icon on the right of the panel.
E04B LD DE,$64BC Point DE at EmptyCupPicture.
E04E POP BC Restore the flags.
E04F LD A,B Fetch the flag for the icon on the right.
E050 AND A Test it.
E051 JR Z,RunGame_RightIcon Jump to RunGame_RightIcon if the flag is not set.
E053 LD DE,$6498 Point DE at FilledCupPicture.
RunGame_RightIcon E056 CALL DrawPicture Draw the icon on the right.
Update the panel, reset the state of the player and print the digits of the lives and the bottles.
E059 CALL UpdatePanelDigits Update the digits of the lives and the bottles.
E05C CALL StartGame_Life Reset the state of the player, the countdown timer and the gauges.
E05F LD DE,$E1A5 Point DE at LivesTextPlayerOne_Record.
E062 LD B,$04 Set the number of text records to 04.
E064 CALL PrintTextRecords Print the digits of the lives and the bottles of both players.
Put the entities and the bottles of the level in place, build the view and print the messages.
E067 CALL ResetEntities Reset the entities.
E06A CALL RestoreBottles Restore the bottles that the player has not yet collected.
E06D CALL BuildView Build the view of the level.
E070 CALL ScrollStageMessage Scroll in the message for the stage.
E073 CALL ShowExitMessage Show the exit message, if all of the bottles have been collected.
Draw the first frame, and wipe it on to the screen.
RunGame_Frame E076 LD IX,$B540 Point IX at Entities.
E07A CALL ProjectPlayerEntity Project the player on to the screen.
E07D CALL UpdateEntities Update the entities.
E080 CALL BuildDrawList Build the draw list.
E083 CALL SortDrawList Sort the draw list.
E086 CALL DrawItems Draw the items of the draw list.
E089 CALL WipeViewIn Wipe the view on to the screen.
E08C CALL RestoreItemRows Put the rows of the screen buffer back.
Run the frames of the game until the player loses a life or leaves the level. Then remove the entities that were made from the objects of the level, and clear the message.
E08F CALL RunFrame Run the frames of the game.
E092 CALL RemoveObjectEntities Remove the entities that were made from the objects of the level.
E095 LD DE,$CE5A Point DE at ExitClosedMessages.
E098 CALL PrintText Clear the first part of the message.
E09B CALL PrintText Clear the second part of the message.
E09E LD A,($AA5A) Fetch the flag that shows a life has been lost.
E0A1 AND A Test it.
E0A2 JR Z,RunGame_Complete Jump to RunGame_Complete if the player has left the level.
The player lost a life. Wipe the view off the screen and take away a life.
RunGame_Lost E0A4 CALL WipeViewOut Wipe the view off the screen.
E0A7 LD A,($DEDE) Fetch the number of lives.
E0AA DEC A Take away a life.
RunGame_Loop3 E0AB LD ($DEDE),A Store the number of lives.
E0AE JR Z,RunGame_Over Jump to RunGame_Over if the player has no lives left.
Hand over to the other player in a game with two players, and carry on from the start of a life.
E0B0 LD A,($60FD) Fetch the number of players.
E0B3 AND A Test it.
E0B4 CALL NZ,SwitchPlayer Swap the details of the two players if there are two players.
E0B7 JP RunGame_Life Start the next life.
The player has no lives left. Show the message 'GAME OVER' and the number of the player, and check the high score.
RunGame_Over E0BA CALL ResetAttributes Reset the attributes of the screen.
E0BD CALL ClearScreen Clear the screen.
E0C0 LD DE,$DED0 Point DE at GameOverText.
E0C3 CALL PrintText Print it.
E0C6 CALL ShowPlayerNumber_Print Print the number of the player and play the game over tune.
E0C9 CALL UpdateHighScore Check whether the score is a new high score.
E0CC LD A,($60FD) Fetch the number of players.
E0CF AND A Test it.
E0D0 JP Z,RunGame_Loop Go back to the title menu if there is only one player.
E0D3 LD A,($DEFD) Fetch the number of lives of the other player.
E0D6 AND A Test it.
E0D7 JP Z,RunGame_Loop Go back to the title menu if the other player has no lives left either.
E0DA CALL SwitchPlayer Swap the details of the two players.
E0DD JP RunGame_Life Start a life for the other player.
The player has left the level. Go on to the next level, put all of the bottles back and give the bonus for the time that is left.
RunGame_Complete E0E0 XOR A Clear the bottle flag of the player.
E0E1 LD ($DEFC),A Store it.
E0E4 LD A,($DEDF) Fetch the number of the level.
E0E7 INC A Go on to the next level.
E0E8 LD ($DEDF),A Store it.
E0EB LD HL,$DEE1 Point HL at BottleStates.
E0EE LD A,$81 Set the state of an uncollected bottle.
E0F0 LD B,$14 Set the number of bottles to 14.
RunGame_Loop4 E0F2 LD (HL),A Set the state of a bottle.
E0F3 INC HL Move on to the next bottle.
E0F4 DJNZ RunGame_Loop4 Loop back to RunGame_Loop4 until all of the bottles have been done.
E0F6 LD HL,$0000 Clear the wanted heading of the player.
E0F9 LD ($B564),HL Store it.
E0FC CALL PlayFanfare Play the fanfare.
E0FF CALL CountDownTime Count down the time that is left and add it to the score.
E102 CALL WipeViewOut Wipe the view off the screen.
E105 XOR A Clear the restart position.
E106 LD ($DEF7),A Store it.
After the last level, show the ending and finish the game.
E109 LD A,($DEDF) Fetch the number of the level.
E10C SUB $05 Take away the number of levels.
E10E JR NZ,RunGame_Next Jump to RunGame_Next if the last level has not been finished.
E110 CALL ShowEnding Show the ending.
E113 XOR A Set the number of lives to zero.
E114 JR RunGame_Loop3 Jump to RunGame_Loop3 to finish the game.
RunGame_Next E116 CALL SetLevelGraphics Set the colours and the shape of the next level.
E119 JP RunGame_Loop2 Start the level.
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