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If you died in Prize for the Reckless, which is at (11,7), and respawned in the same room, tile 59 (a solid invisible tile) would be placed at [18,9] to prevent the moving platform from going back through the quicksand. Unfortunately, the way that this kludge was added is poor. First, the conditional makes it so that it doesn't happen in ONLY (11,7). Instead of being behind a positive conditional, the tile is placed in the else-branch of an if-conditional that checks for the normal case, i.e. if the current room is NOT (11,7), thus being a negative conditional. In other words, the positive conditional is "game.roomx == 111 && game.roomy == 107". To negate it, all you would have to do is "!(game.roomx == 111 && game.roomy == 107)". However, whoever wrote this decided to go one step further, and actually DISTRIBUTE the negative into both statements. This would be fine, except if they actually got it right. You see, according to De Morgan's laws, when you distribute a negative across multiple statements you not only have to negate the statements themselves, but you have to negate all the CONJUNCTIONS, too. In other words, you have to change all "and"s into "or"s and all "or"s into "and"s. Instead of making the conditional "game.roomx != 111 || game.roomy != 107", the person who wrote this forgot to replace the "and" with an "or". Thus, it is "game.roomx != 111 && game.roomy != 107" instead. As a result, if we re-negate this and take a look at the positive conditional, i.e. the conditional that results in the else-branch executing, it turns out to be "game.roomx == 111 || game.roomy == 107". This ends up forming a cross-shape of rooms where this kludge happens. As long as your room is either on the line x=11 or on the line y=7, this kludge will execute. You can see this if you go to Boldly To Go, since it is (11,13), which is on the line x=11. Checkpoint in that room, then touch a disappearing platform, wait for it to fully disappear, then die. Then an invisible tile will be placed to the left of the spikes on the ceiling. Anyway, to fix this, it's simple. Just change the "and" in the negative conditional to an "or". The second problem was that this kludge was happening in custom levels. So I've added a map.custommode check to it. I made sure not to make the same mistake originally made, i.e. I made sure to use an "or" instead of an "and". Thus, when you re-negate the negative conditional and turn it into the positive conditional, it reads: "game.roomx == 111 && game.roomy == 107 && !map.custommode". |
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| .. | ||
| src | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CONTRIBUTORS.txt | ||
| README.md | ||
How to Build
VVVVVV's official desktop versions are built with the following environments:
- Windows: Visual Studio 2010
- macOS: Xcode CLT, currently targeting 10.9 SDK
- GNU/Linux: CentOS 7
The engine depends solely on SDL2 and SDL2_mixer. All other dependencies are statically linked into the engine. The development libraries for Windows can be downloaded from their respective websites, Linux developers can find the dev libraries from their respective repositories, and macOS developers should compile and install from source (including libogg/libvorbis/libvorbisfile).
Steamworks support is included and the DLL is loaded dynamically, you do not need the SDK headers and there is no special Steam or non-Steam version. The current implementation has been tested with Steamworks SDK v1.46.
To generate the projects on Windows:
# Put your SDL2/SDL2_mixer folders somewhere nice!
mkdir flibitBuild
cd flibitBuild
cmake -G "Visual Studio 10 2010" .. -DSDL2_INCLUDE_DIRS="C:\SDL2-2.0.10\include;C:\SDL2_mixer-2.0.4\include" -DSDL2_LIBRARIES="C:\SDL2-2.0.10\lib\x86\SDL2;C:\SDL2-2.0.10\lib\x86\SDL2main;C:\SDL2_mixer-2.0.4\lib\x86\SDL2_mixer"
Note that on some systems, the SDL2_LIBRARIES list on Windows may need
SDL2/SDL2main/SDL2_mixer to have .lib at the end of them. The reason for this
inconsistency is unknown.
To generate everywhere else:
mkdir flibitBuild
cd flibitBuild
cmake ..
macOS may be fussy about the SDK version. How to fix this is up to the whims of however Apple wants to make CMAKE_OSX_SYSROOT annoying to configure and retain each time Xcode updates.
Including data.zip
You'll need the data.zip file from VVVVVV to actually run the game! It's available to download separately for free in the Make and Play edition of the game. Put this file next to your executable and the game should run.
This is intended for personal use only - our license doesn't allow you to actually distribute this data.zip file with your own forks without getting permission from us first. See LICENSE.md for more details. (If you've got a project in mind that requires distributing this file, get in touch!)
A Word About Compiler Quirks
This engine is super fussy about optimization levels and runtime checks. In particular, the Windows version absolutely positively must be compiled in Debug mode, with /RTC enabled. If you build in Release mode, or have /RTC disabled, the game behaves dramatically different in ways that were never fully documented (bizarre softlocks, out-of-bounds issues that don't show up in tools like Valgrind, stuff like that). There are lots of things about this old code that could be cleaned up, polished, rewritten, and so on, but this is the one that will probably bite you the hardest when setting up your own build, regardless of platform.
We hope you'll enjoy messing with the source anyway!
Love, flibit