Simple mod

[Zahon7]

Is there a way to add a simple "modding" system??

Here is my current setup, but it's not working...

Main.cpp:

#include <dlfcn.h>
#include <raylib.h>

typedef void (*UpdateFunction)();
UpdateFunction update;

int main() {
	InitWindow(1000, 600, "Mod loading test");

	void* handle = dlopen("mod.so", RTLD_NOW | RTLD_GLOBAL);
	update = (UpdateFunction)dlsym(handle, "Update");

	while(!WindowShouldClose()) {
		BeginDrawing();
			ClearBackground(WHITE);
			update();
		EndDrawing();
	}

	dlclose(handle);
	CloseWindow();
}

Mod.cpp:

#include <raylib.h>

extern "C" {

void Update() {
        ClearBackground(RED);
}

};

$ g++ mod.cpp -shared -fPIC -lraylib -o mod.so
$ g++ main.cpp -lraylib -ldl -g -o main

But when I run ./main, the program segfaults.

Backtrace:

#0  0x0000000000000000 in ?? ()
#1  0x00007fffed12981d in rlClearColor () from mod.so
#2  0x00007fffed13839f in ClearBackground () from mod.so
#3  0x00007fffed11d2ac in Update () from mod.so
#4  0x000055555555b8f2 in main () at main.cpp:16

[Peter0x44]

Is -lraylib a static, or shared library in this case? It must be a shared library for this to work, since raylib has global state, and if linked static, both the so and your executable will have their own copies of this state.

[Zahon7]

Thanks, that works, I linked raylib statically in that case 👍