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17169320b4
So #434 didn't end up solving the deltaframe flashing fully, only reduced the chances that it could happen. I've had the Level Complete image flash a few times when the Game Saved text box pops up. This seems to be because the Level Complete image is based off of the text box being at y-position 12, and the Game Saved text box is also at y-position 12. Level Complete only gets drawn if the text box additionally has a red channel value of 165, and the Game Saved text box has a red channel value of 174. However, there is a check that the text box be fully opaque first before drawing special images. So what went wrong? Well, after thinking about it for a while, I realized that even though there is indeed an opaqueness check, the alpha of the text box updates BEFORE it gets drawn. And during the deltaframes immediately after it gets updated, the text box is considered fully opaque. It's completely possible for the linear interpolation to end up with a red channel value of 165 during these deltaframes, while the text box is opaque as well. As always, it helps if you have a high refresh rate, and run the game under 40% slowdown. Anyways, so what's the final fix for this issue? Well, use the text box 'target' RGB values instead - its tr/tg/tb attributes instead of its r/g/b attributes. They are not subject to interpolation and so are completely reliable. The opaqueness check should still be kept, though, because the target values don't account for opaqueness. And this way, we get no more deltaframe flashes during text box fades. An even better fix would be to not use magic RGB values to draw special images... but that'd be something to do later. |
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This is the source code to VVVVVV, version 2.0+. For more context about this release, see the announcement on Terry's blog!
License
VVVVVV's source code is made available under a custom license. See LICENSE.md for more details.
In general, if you're interested in creating something that falls outside the license terms, get in touch with Terry and we'll talk about it!
Authors
- Created by Terry Cavanagh
- Room Names by Bennett Foddy
- Music by Magnus Pålsson
- Metal Soundtrack by FamilyJules
- 2.0 Update (C++ Port) by Simon Roth
- 2.2 Update (SDL2/PhysicsFS/Steamworks port) by Ethan Lee
- Beta Testing by Sam Kaplan and Pauli Kohberger
- Ending Picture by Pauli Kohberger
Versions
There are two versions of the VVVVVV source code available - the desktop version (based on the C++ port, and currently live on Steam), and the mobile version (based on a fork of the original flash source code, and currently live on iOS and Android).