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Pattern pen implementation differences

While looking into something unrelated in Space Quest 3, I noticed that the dirt on the right of the starting screen was drawn differently between DOS SCI and ScummVM. Today I looked into it a little closer, comparing SCI proper, ScummVM, SCI Companion, and SCI Viewer.

Damn, that’s some really tiny differences that you’re not gonna spot just like this. But here they are:

  • In most of them, the mound on the right looks like this:
  • Except in ScummVM, where it looks like this: (and now you know why I looked into this)
  • Below the column in the middle looks like this in SCI and SV:
  • But it looks more like this in SCI Companion and ScummVM alike:
  • The heap on the left is also mildly affected, looking like this in SCI and SV:
  • But it looks like this is SCI Companion and ScummVM:
  • And finally, SV, reknowned for being Very Good At This, breaks the one rule — you don’t get to draw white on non-white:

So yeah, a slight difference in where a window border is drawn is the least of your problems.

Update: ScummVM had its pattern table corrected this week. Guess I’ll have to check out the latest nightly, huh? And yes, it does match SCI proper now. Good job everyone!

Bonus update: sluicebox suggested comparing against SCI Studio. Here you go, friend: the mound on the right looks like this in SCI Studio, a distinctive variation, and the bit under the pillar and to the left matched SCI Companion and ScummVM (past tense now),

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