minor refactor for plugins

1 files changed, 51 insertions, 0 deletions

diff --git a/src/plugins.cpp b/src/plugins.cpp
new file mode 100644
index 0000000..aa7efd5
--- /dev/null
+++ b/src/plugins.cpp
@@ -0,0 +1,51 @@
+
+#include "macros.hpp"
+#include "plugins.hpp"
+
+#include <cstdio>
+#include <dlfcn.h>
+
+PKEPluginInterface pkePlugin{};
+
+void *loadedPlugin = nullptr;
+
+void Pke_UpdatePlugin(const PKEPluginInterface &plugin) {
+	pkePlugin.OnInit = plugin.OnInit;
+	pkePlugin.OnTick = plugin.OnTick;
+	pkePlugin.OnTeardown = plugin.OnTeardown;
+	pkePlugin.OnImGuiRender = plugin.OnImGuiRender;
+}
+
+void Pke_LoadPlugin(const char *path) {
+	if (loadedPlugin != nullptr || loadedPlugin != CAFE_BABE(void)) {
+		return;
+	}
+	void *extension = dlopen(path, RTLD_NOW);
+	char *err = dlerror();
+	if (!extension) {
+		fprintf(stderr, "Given plugin library (%s) failed to load: %s\n", path, err);
+		return;
+	}
+	PKEPluginInterface *interface = reinterpret_cast<PKEPluginInterface *>(dlsym(extension, "pkePluginInterface"));
+	err = dlerror();
+	if (err != NULL) {
+		fprintf(stderr, "Given plugin library (%s) did not contain 'pkePluginInterface': %s\n", path, err);
+		dlclose(extension);
+		return;
+	}
+	Pke_UpdatePlugin(*interface);
+	loadedPlugin = interface;
+}
+
+void Pke_UnloadPlugin() {
+	pkePlugin = {
+		.OnInit = nullptr,
+		.OnTick= nullptr,
+		.OnTeardown= nullptr,
+		.OnImGuiRender= nullptr,
+	};
+	if (loadedPlugin != nullptr && loadedPlugin != CAFE_BABE(void)) {
+		dlclose(loadedPlugin);
+		loadedPlugin = CAFE_BABE(void);
+	}
+}