2024-07-23 05:38:21 +03:00
|
|
|
# Examples
|
|
|
|
|
|
|
|
|
|
## What is this?
|
|
|
|
|
|
|
|
|
|
In here are a collection of standalone SDL application examples. Unless
|
|
|
|
|
otherwise stated, they should work on all supported platforms out of the box.
|
|
|
|
|
If they don't [please file a bug to let us know](https://github.com/libsdl-org/SDL/issues/new).
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## What is this SDL_AppIterate thing?
|
|
|
|
|
|
|
|
|
|
SDL can optionally build apps as a collection of callbacks instead of the
|
|
|
|
|
usual program structure that starts and ends in a function called `main`.
|
|
|
|
|
The examples use this format for two reasons.
|
|
|
|
|
|
|
|
|
|
First, it allows the examples to work when built as web applications without
|
|
|
|
|
a pile of ugly `#ifdef`s, and all of these examples are published on the web
|
|
|
|
|
at [examples.libsdl.org](https://examples.libsdl.org/), so you can easily see
|
|
|
|
|
them in action.
|
|
|
|
|
|
|
|
|
|
Second, it's example code! The callbacks let us cleanly break the program up
|
|
|
|
|
into the four logical pieces most apps care about:
|
|
|
|
|
|
|
|
|
|
- Program startup
|
|
|
|
|
- Event handling
|
|
|
|
|
- What the program actually does in a single frame
|
|
|
|
|
- Program shutdown
|
|
|
|
|
|
|
|
|
|
A detailed technical explanation of these callbacks is in
|
|
|
|
|
docs/README-main-functions.md (or view that page on the web on
|
2024-07-23 06:41:16 +03:00
|
|
|
[the wiki](https://wiki.libsdl.org/SDL3/README/main-functions#main-callbacks-in-sdl3)).
|
2024-07-23 05:38:21 +03:00
|
|
|
|
|
|
|
|
|
|
|
|
|
## I would like to build and run these examples myself.
|
|
|
|
|
|
|
|
|
|
When you build SDL with CMake, you can add `-DSDL_BUILD_EXAMPLES=On` to the
|
|
|
|
|
CMake command line. When you build SDL, these examples will be built with it.
|
|
|
|
|
|
|
|
|
|
But most of these can just be built as a single .c file, as long as you point
|
|
|
|
|
your compiler at SDL3's headers and link against SDL.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## What is the license on the example code? Can I paste this into my project?
|
|
|
|
|
|
|
|
|
|
All code in the examples directory is considered public domain! You can do
|
|
|
|
|
anything you like with it, including copy/paste it into your closed-source
|
|
|
|
|
project, sell it, and pretend you wrote it yourself. We do not require you to
|
|
|
|
|
give us credit for this code (but we always appreciate if you do!).
|
|
|
|
|
|
|
|
|
|
This is only true for the examples directory. The rest of SDL falls under the
|
|
|
|
|
[zlib license](https://github.com/libsdl-org/SDL/blob/main/LICENSE.txt).
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## What is template.html and highlight-plugin.lua in this directory?
|
|
|
|
|
|
|
|
|
|
This is what [examples.libsdl.org](https://examples.libsdl.org/) uses when
|
|
|
|
|
generating the web versions of these example programs. You can ignore this,
|
|
|
|
|
unless you are improving it, in which case we definitely would love to hear
|
|
|
|
|
from you!
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## What is template.c in this directory?
|
|
|
|
|
|
|
|
|
|
If writing new examples, this is the skeleton code we start from, to keep
|
|
|
|
|
everything consistent. You can ignore it.
|
|
|
|
|
|
|
|
|
|
|
