148 lines
4.8 KiB
Markdown
148 lines
4.8 KiB
Markdown
|
|
|
|
## raylib-lua
|
|
|
|
[LuaJIT](https://luajit.org/)-based binding for [raylib](https://www.raylib.com/), a simple and easy-to-use
|
|
library to learn videogames programming.
|
|
|
|
This binding is partially based on [raylib-wren/wray](https://github.com/TSnake41/raylib-wren).
|
|
|
|
### Usage (raylua_s)
|
|
|
|
raylua_s is the script-mode binary of raylib-lua.
|
|
Without any argument, you get into the REPL which gives you a minimal Lua
|
|
shell that allows you to run Lua code from terminal.
|
|
|
|
You can specify a Lua file as argument to run the specified Lua file.
|
|
|
|
### Usage (raylua_e)
|
|
|
|
raylua_e is the embedding-mode binary of raylib-lua.
|
|
|
|
This binary allows you to build standalone raylib applications from Lua code.
|
|
|
|
There are 3 ways to use it :
|
|
- zip mode :
|
|
If you specify a zip file as argument, this zip will be used as payload
|
|
application, this file expects to have a `main.lua` which is the entry point
|
|
of the application.
|
|
- directory mode :
|
|
Similar to zip mode except that it automatically build the zip payload from
|
|
the specified directory.
|
|
- lua mode :
|
|
Build the executable from a single Lua file.
|
|
|
|
Using `require` in embedded mode works as expected but `dofile` and `loadfile`
|
|
may not work as expected as these functions load from a external file rather
|
|
than from `package` loaders.
|
|
|
|
### Building / Updating Raylib / Contribution
|
|
|
|
To build raylib-lua from source, you need to take care that submodules are
|
|
imported, if not or you are unsure :
|
|
|
|
```shell
|
|
git submodule init
|
|
git submodule update
|
|
```
|
|
|
|
A Lua working interpreter is needed, by default luajit is used, to override it,
|
|
edit LUA variable in `makefile`.
|
|
|
|
This make take some time depending on network bandwidth.
|
|
Then, raylib-lua should build as expected using `make` tool with a working C compiler.
|
|
|
|
If you need to update raylib binding, there are few tasks to do :
|
|
- update `tools/api.h` functions signatures, keep file clean with exactly one function per line.
|
|
- update struct definitions in `src/raylib.lua`
|
|
|
|
### Loading embedded ressources
|
|
|
|
Currently, raylib-lua doesn't support loading ressources from payload using
|
|
raylib API. However, you can still arbitrarily load files from payload using
|
|
`raylua.loadfile` which returns a boolean indicating success and file content.
|
|
|
|
### Making structs
|
|
|
|
To make raylib structs, you need to use the LuaJIT FFI.
|
|
```lua
|
|
local ffi = require "ffi"
|
|
```
|
|
|
|
Then use ffi.new to make a struct, e.g `ffi.new("Color", r, g, b, a)`
|
|
|
|
#### Note concerning pointers
|
|
|
|
As LuaJIT doesn't support pointer dereferencing, you need to build a
|
|
single-element array, e.g
|
|
```lua
|
|
local image = ffi.new("Image[1]")
|
|
```
|
|
In this case, to access the element of `image`, you need to do `image[0]`.
|
|
The pointer you can pass is `image`.
|
|
|
|
### Example
|
|
|
|
```lua
|
|
rl.SetConfigFlags(rl.FLAG_VSYNC_HINT)
|
|
rl.SetTargetFPS(60)
|
|
|
|
rl.InitWindow(800, 450, "raylib [core] example - basic window")
|
|
|
|
while not rl.WindowShouldClose() do
|
|
rl.BeginDrawing()
|
|
|
|
rl.ClearBackground(rl.RAYWHITE)
|
|
rl.DrawText("Congrats! You created your first window!", 190, 200, 20, rl.LIGHTGRAY)
|
|
|
|
rl.EndDrawing()
|
|
end
|
|
|
|
rl.CloseWindow()
|
|
```
|
|
|
|
### Compatibility
|
|
|
|
raylib-lua (raylua) is currently compatible with raylib v3.0 API.
|
|
There is currently no support for rlgl and raygui, but it may be considered
|
|
in the future.
|
|
|
|
#### Global API
|
|
|
|
You can make raylib-lua (raylua) partially compatible with
|
|
[original raylib-lua](https://github.com/raysan5/raylib-lua) or
|
|
[raylib-lua-sol](https://github.com/RobLoach/raylib-lua-sol) with global API by
|
|
adding `setmetatable(_G, { __index = rl })` on the first line.
|
|
|
|
This will allow direct use of raylib binding through globals instead of `rl` table.
|
|
|
|
### Other bindings
|
|
|
|
raylib-lua (raylua) is not the only Lua binding for raylib.
|
|
|
|
There are some other bindings, which may or may not be up to date.
|
|
|
|
[RobLoach/raylib-lua-sol](https://github.com/RobLoach/raylib-lua-sol)
|
|
|
|
[raysan5/raylib-lua](https://github.com/raysan5/raylib-lua/)
|
|
|
|
[HDPLocust/raylib-luamore](https://github.com/HDPLocust/raylib-luamore)
|
|
|
|
[alexander-matz ffi binding](https://gist.github.com/alexander-matz/f8ee4eb9fdf676203d70c1e5e329a6ec)
|
|
|
|
### Licence
|
|
|
|
Copyright (C) 2020 Astie Teddy
|
|
|
|
Permission to use, copy, modify, and/or distribute this software for any
|
|
purpose with or without fee is hereby granted, provided that the above
|
|
copyright notice and this permission notice appear in all copies.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
|
|
OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
|
|
CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|