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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| Dockerfile | ||
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| version.cmake | ||
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 2.0.14+ 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
(Note: This section only applies to version 2.2 of the source code, which is the initial commit of this repository. Since then, much hard work has been put in to fix many undefined behaviors. If you're compiling the latest version of the source code, ignore this section.)
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