Ragdol is a tiny game engine & fantasy console written in C++20 and powered by SDL. It has the following (tentative) virtual limitations:

• a 16 color palette
• a 128 x 128 screen
• 8 button inputs (4 directional, 3 free, 1 menu/start)

• SDL2
• C++20 compiler (currently using g++)

# build project
$ mkdir build
$ cd build
$ cmake ..
$ make
# run scripts
$ ./ragdol test/fib.rd

Currently ragdol uses a custom dynamic scripting language (that resembles an amalgamation of C and Python) with a custom interpreter that uses the visitor pattern. This is heavily a work in progress at the moment, and the language currently has support for:

• Dynamic creation and assignment/reassignment of variables (int, float, boolean, string)
• Scoping/Nesting of variables & logic
• Full expressions with order of operations from logical AND/OR all the way down to add/subtract
• Function definition & calling with optional returns and arguments
• Control flow with if/elif/else
• Loops (Currently only while loop)
• Builtin basic functions (Print, open window)
• Builtin game engine functions (process input, render graphics, init window)

Below is a basic example of an update function in a ragdol script polling input & drawing a moving player character & text to the screen.

Ragdol is a WIP engine and currently is looking to add the following:

• Arrays & Objects/tables
• Expansive builtin math library
• Game engine utilities (including for sound, levels, OOP, vectors & vector math, and more)
• Built in sprite editor & custom sprite loading
• General optimizations to interpreter

fn fb(n) {
 if (n <= 1) { return n }
 return fib(n - 1) + fib(n - 2)
}
var i = 0
while (i < 10) {
 i = i + 1
 print(fib(i))
}