Reworked command line argument handling (#804)

* Reworked command line argument handling

Added a new class to handle these

base/vulkanexamplebase.h

@@ -37,6 +37,7 @@
 #include <assert.h>
 #include <vector>
 #include <array>
+#include <unordered_map>
 #include <numeric>
 #include <ctime>
 #include <iostream>
@@ -71,6 +72,26 @@
 #include "camera.hpp"
 #include "benchmark.hpp"
 
+class CommandLineParser
+{
+public:
+	struct CommandLineOption {
+		std::vector<std::string> commands;
+		std::string value;
+		bool hasValue = false;
+		std::string help;
+		bool set = false;
+	};
+	std::unordered_map<std::string, CommandLineOption> options;
+	CommandLineParser();
+	void add(std::string name, std::vector<std::string> commands, bool hasValue, std::string help);
+	void printHelp();
+	void parse(std::vector<const char*> arguments);
+	bool isSet(std::string name);
+	std::string getValueAsString(std::string name, std::string defaultValue);
+	int32_t getValueAsInt(std::string name, int32_t defaultValue);
+};
+
 class VulkanExampleBase
 {
 private:
@@ -160,6 +181,7 @@ public:
 	uint32_t height = 720;
 
 	vks::UIOverlay UIOverlay;
+	CommandLineParser commandLineParser;
 
 	/** @brief Last frame time measured using a high performance timer (if available) */
 	float frameTimer = 1.0f;