Background corruption after player death [4.5.9 shooter]

[Zikifer]

After my player dies and is warped back to the continue point, there are graphical glitches with the background. They are always in the same place and seem to affect a column.


(That block under the S shouldn't be there, and the shore above and below should be light brown+green, not blue.)

I am using Checkpoint tiles to save the player position periodically. The player starts right in front of one so I'm guaranteed that the values have been initialized properly. That code is

;;; Checkpoint tile
LDA updateScreenData
AND #%00000100
BEQ +doScript
    ;; wait until tile update is finished.
    RTS

+doScript:   
    CPX player1_object
    BEQ +doCheckpoint
        JMP +skip

+doCheckpoint:
    LDA warpMap
    STA continueMap

    LDA Object_screen,x
    STA continueScreen
    
    LDA Object_x_hi,x
    STA continueX
    
    LDA Object_y_hi,x
    STA continueY
    
    ChangeTileAtCollision #0, #0 ;; change to tile zero (make disappear), collision type 0
    JSR doWaitFrame

+skip:
    RTS

On player death it changes to Action Step 7 and plays a death animation, with Action "StopMoving" and End Animation "Go To Continue". The "Go To Continue" code:

;;; 09 = Go To Continue
goToContinue_action:
    LDA continueMap
    STA warpToMap
    
    LDA continueScreen
    STA warpToScreen

    WarpToScreen warpToMap, warpToScreen, #$02
    RTS

I have already removed all of the Path code (per instructions on this forum) and it didn't seem to make a difference. Any suggestions?

 

[dale_coop]

My first suggestion is... if your checkpoint tile is invisible, just comment out the ChangeTileAtCollision line, you don't need that and in fact it can cause a glitch when your player respawn on it.

Alson about glitches after warps, where is that very useful topic:

[4.5.6] Graphic Glitch after Warp?

Anyone know why this happens after warping into this screen? MetroVania module. If I start from this screen, everything is fine. But if I warp in to this screen from a special screen, I get this weird grid of graphic glitches on the scroll border. Also my player starts automatically running to...

nesmakers.com

 

[Zikifer]

Thanks! I think this part fixed it:

LDA #%11000010
STA scrollByte

Making my Go To Continue action:

goToContinue_action:
    LDA #%11000010
    STA scrollByte

    WarpToScreen continueMap, continueScreen, #$02
    JSR doWaitFrame
    RTS