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So, earlier in the development of 2.0, Simon Roth (I presume) encountered a problem: Oh no, all my backgrounds aren't appearing! And this is because my foregroundBuffer, which contains all the drawn tiles, is drawing complete black over it! So he had a solution that seems ingenius, but is actually really really hacky and super 100% NOT the proper solution. Just, take the foregroundBuffer, iterate over each pixel, and DON'T draw any pixel that's 0xDEADBEEF. 0xDEADBEEF is a special signal meaning "don't draw this pixel". It is called a 'key'. Unfortunately, this causes a bug where translucent pixels on tiles (pixels between 0% and 100% opacity) didn't get drawn correctly. They would be drawn against this weird blue color. Now, in #103, I came across this weird constant and decided "hey, this looks awfully like that weird blue color I came across, maybe if I set it to 0x00000000, i.e. complete and transparent black, the issue will be fixed". And it DID appear to be fixed. However, I didn't look too closely, nor did I test it that much, and all that ended up doing was drawing the pixels against black, which more subtly disguised the problem with translucent pixels. So, after some investigation, I noticed that BlitSurfaceColoured() was drawing translucent pixels just fine. And I thought at the time that there was something wrong with BlitSurfaceStandard(), or something. Further along later I realized that all drawn tiles were passing through this weird OverlaySurfaceKeyed() function. And removing it in favor of a straight SDL_BlitSurface() produced the bug I mentioned above: Oh no, all the backgrounds don't show up, because my foregroundBuffer is drawing pure black over them! Well... just... set the proper blend mode for foregroundBuffer. It should be SDL_BLENDMODE_BLEND instead of SDL_BLENDMODE_NONE. Then you don't have to worry about your transparency at all. If you did it right, you won't have to resort this hacky color-keying business. *sigh* |
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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).