Added screenshot feature (F2 key)

src/util/platform.cpp

@@ -1,12 +1,46 @@
 #include "platform.h"
 
+#include <sstream>
+#include <filesystem>
+#include <iomanip>
+#include <time.h>
+
+#include "../typedefs.h"
+
 #define SETTINGS_FILE "settings.json"
+#define SCREENSHOTS_FOLDER "screenshots"
+
+using std::string;
 
 
-std::string platform::get_settings_file() {
+string platform::get_settings_file() {
 	return SETTINGS_FILE;
 }
 
+string platform::get_screenshot_file(string ext) {
+	std::string folder = SCREENSHOTS_FOLDER;
+	if (!std::filesystem::is_directory(folder)) {
+		std::filesystem::create_directory(folder);
+	}
+
+	auto t = std::time(nullptr);
+    auto tm = *std::localtime(&t);
+
+	const char* format = "%d-%m-%Y_%H-%M-%S";
+
+	std::stringstream ss;
+	ss << std::put_time(&tm, format);
+	string datetimestr = ss.str();
+
+	string filename = folder+"/screenshot-"+datetimestr+"."+ext;
+	uint index = 0;
+	while (std::filesystem::exists(filename)) {
+		filename = folder+"/screenshot-"+datetimestr+"-"+std::to_string(index)+"."+ext;
+		index++;
+	}
+	return filename;
+}
+
 #ifdef WIN32
 #include <Windows.h>