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I cannot find how to disable the Screen Lock in Sonic 1

Discussion in 'Engineering & Reverse Engineering' started by WillARing, Jan 18, 2025.

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  1. Jan 18, 2025 #1
    WillARing

    WillARing

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    For instance in Marble Zone Act 1 the screen locks above a certain point, which is a problem for me as my layout will not fit. Is there a way to disable it? (I'm using the Github disassembly)
     
  2. Jan 18, 2025 #2
    Devon

    Devon

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    Screen boundary changes are handled in code in "DynamicLevelEvents" (or "DynScrResizeLoad" in the old 2005 disassembly).
     
  3. Jan 18, 2025 #3
    WillARing

    WillARing

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    This helped a lot with marble zone, though I still can't seem to move the Goalpost boundary.
     
  4. Jan 18, 2025 #4
    Devon

    Devon

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    For that, you must edit the initial stage boundary array, which is located at "LevelSizeArray". The format for each stage is as follows:
    • 4 (2 bytes)
    • Left boundary (2 bytes)
    • Right boundary (2 bytes) (this is what you want to change)
    • Top boundary (2 bytes) (set to 0xFF00 to enable vertical wrapping, like in Labyrinth Zone act 3)
    • Bottom boundary (2 bytes)
    • 0x60 (2 bytes)