inital commit

solanaceae/plugin/plugin.cpp

@@ -0,0 +1,124 @@
+#include "./plugin.hpp"
+
+// https://youtu.be/RsHGUL5E1_s
+
+#define SOLANA_PLUGIN_HOST
+#include "./solana_plugin_v1.h"
+
+#if (defined(_WIN32) || defined(_WIN64))
+	#define WIN32_LEAN_AND_MEAN
+	#include <windows.h>
+	#undef WIN32_LEAN_AND_MEAN
+#else
+	#include <dlfcn.h>
+#endif
+
+#if defined(_WIN32) || defined(_WIN64)
+	#define WINDOWS
+#elif defined(__APPLE__)
+	#define APPLE
+#else
+	#define LINUX
+#endif
+
+#include <iostream>
+#include <cassert>
+
+void* Plugin::loadSymbol(const char* s_name) {
+#if defined(_WIN32) || defined(_WIN64)
+	return GetProcAddress(_dl, s_name);
+#else
+	return dlsym(_dl, s_name);
+#endif
+}
+
+// loads lib and gets name (and version)
+Plugin::Plugin(const char* path) {
+#if defined(_WIN32) || defined(_WIN64)
+	_dl = (void*)LoadLibraryA(path);
+#else
+	_dl = (void*)dlopen(path, RTLD_NOW /*| RTLD_LOCAL*/);
+#endif
+
+	if (!_dl) {
+		std::cerr << "PLG opening '" << path << "' failed\n";
+		return;
+	}
+
+	_fn_name = loadSymbol("solana_plugin_get_name");
+	_fn_version = loadSymbol("solana_plugin_get_version");
+	_fn_start = loadSymbol("solana_plugin_start");
+	_fn_stop = loadSymbol("solana_plugin_stop");
+	_fn_tick = loadSymbol("solana_plugin_tick");
+
+	if (!_fn_name || !_fn_version || !_fn_start || !_fn_stop || !_fn_tick) {
+		std::cerr << "PLG '" << path << "' misses functions\n";
+		return;
+	}
+
+	name = reinterpret_cast<decltype(&solana_plugin_get_name)>(_fn_name)();
+
+	if (name.empty()) {
+		std::cerr << "PLG '" << path << "' misses name\n";
+		return;
+	}
+
+	version = reinterpret_cast<decltype(&solana_plugin_get_version)>(_fn_version)();
+
+	if (version != SOLANA_PLUGIN_VERSION) {
+		std::cerr << "PLG '" << path << "' version mismatch IS:" << version << " SHOULD:" << SOLANA_PLUGIN_VERSION << "\n";
+		return;
+	}
+
+	valid_plugin = true;
+}
+
+Plugin::Plugin(Plugin&& other) {
+	valid_plugin = other.valid_plugin;
+	name = other.name;
+
+	_dl = other._dl;
+	other._dl = nullptr;
+
+	_fn_name = other._fn_name;
+	other._fn_name = nullptr;
+
+	_fn_start = other._fn_start;
+	other._fn_start = nullptr;
+
+	_fn_stop = other._fn_stop;
+	other._fn_stop = nullptr;
+
+	_fn_tick = other._fn_tick;
+	other._fn_tick = nullptr;
+}
+
+// unloads the plugin
+Plugin::~Plugin(void) {
+	if (_dl != nullptr) {
+#if defined(_WIN32) || defined(_WIN64)
+		FreeLibrary(_dl);
+#else
+		dlclose(_dl);
+#endif
+	}
+}
+
+// runs the start function
+uint32_t Plugin::start(SolanaAPI* solana_api) const {
+	assert(valid_plugin);
+	return reinterpret_cast<decltype(&solana_plugin_start)>(_fn_start)(solana_api);
+}
+
+// stop function
+void Plugin::stop(void) const {
+	assert(valid_plugin);
+	reinterpret_cast<decltype(&solana_plugin_stop)>(_fn_stop)();
+}
+
+// tick function
+void Plugin::tick(float delta) const {
+	assert(valid_plugin);
+	reinterpret_cast<decltype(&solana_plugin_tick)>(_fn_tick)(delta);
+}
+