Add proper command line argument parsing with argp

CMakeLists.txt

@@ -30,5 +30,12 @@ if (APPLE)
 		DESTINATION
 		$ {PROJECT_BINARY_DIR} )
 endif (APPLE)
-add_executable( fc2d src/main.cpp src/graphics.cpp src/modelpart.cpp src/cv.cpp src/paths.cpp )
+add_executable( fc2d
+	src/main.cpp
+	src/graphics.cpp
+	src/modelpart.cpp
+	src/cv.cpp
+	src/paths.cpp
+	src/args.cpp
+)
 target_link_libraries( fc2d ${OpenCV_LIBS} ${OPENGL_LIBRARIES} FreeGLUT::freeglut GLEW::glew )

src/args.cpp

@@ -0,0 +1,37 @@
+#include <args.hpp>
+
+const char* argp_program_version =
+	"Facecam2D 0.1.0\n"
+	"License: GPLv3 <https://www.gnu.org/licenses/gpl-3.0.html>\n"
+	"If you did not receive a copy of the source code, it is\n"
+	"available at <https://gitlab.com/epicalert/facecam2d.git>.";
+
+const struct argp_option options[] = {
+	//name, key, arg, flags, doc, group
+	{"haar-cascade",	0x00,	0,	0,	"Use Haar Cascades for faster (but less accurate) face detection.",	0},
+	{0}
+};
+
+struct argp argp = {
+	options,
+	parseOptions,
+	0,
+	0
+};
+
+struct optData optData = {
+	false
+};
+
+error_t parseOptions(int key, char* arg, struct argp_state* state) {
+	switch (key) {
+		case 0x00:	//--haar-cascade
+			optData.useHaar = true;
+			break;
+
+		default:
+			return ARGP_ERR_UNKNOWN;
+	}
+
+	return 0;
+}

src/args.hpp

@@ -0,0 +1,17 @@
+#ifndef ARGS_HPP
+#define ARGS_HPP
+
+#include <argp.h>
+
+error_t parseOptions(int key, char* arg, struct argp_state* state);
+
+struct optData {
+	bool useHaar;	//use haar cascades (0x00)
+};
+
+extern const char* argp_program_version;
+extern const struct argp_option options[];
+extern struct argp argp;
+extern struct optData optData;
+
+#endif

src/cv.cpp

@@ -5,17 +5,15 @@
 
 #include <graphics.hpp>
 #include <paths.hpp>
+#include <args.hpp>
 
 cv::Ptr<cv::face::Facemark> facemark;
 cv::CascadeClassifier haarFaceDetector;
 cv::dnn::Net dnnFaceDetector;
 cv::VideoCapture vid;
 cv::Mat frame, gray, small;
-bool useHaar;
-
-void initCV(bool haar) {
-	useHaar = haar;
 
+void initCV() {
 	haarFaceDetector = cv::CascadeClassifier (resolvePath("cvdata/haarcascade_frontalface_alt2.xml"));
 	dnnFaceDetector = cv::dnn::readNetFromCaffe(
 			resolvePath("cvdata/deploy.prototxt"),
@@ -59,7 +57,7 @@ void cvFrame() {
 
 	std::vector<cv::Rect> faces;
 
-	if (useHaar) {
+	if (optData.useHaar) {
 		//downsample image for face detection, works too slow on full res
 		cv::pyrDown (gray, small);
 		cv::pyrDown (small, small);
@@ -74,7 +72,7 @@ void cvFrame() {
 	int biggestArea = 0;
 	for (int i = 0; i < faces.size(); i++) {
 		//convert face region to full res, because we perform facemark on full res
-		if (useHaar) {
+		if (optData.useHaar) {
 			faces[i] = cv::Rect (faces[i].x * 4, faces[i].y * 4, faces[i].width * 4, faces[i].height * 4);
 		}
 

src/cv.hpp

@@ -1,7 +1,7 @@
 #ifndef CV_HPP
 #define CV_HPP
 
-void initCV(bool haar);
+void initCV();
 
 void cvFrame();
 

src/main.cpp

@@ -1,11 +1,14 @@
 #include <graphics.hpp>
 #include <cv.hpp>
 #include <paths.hpp>
+#include <args.hpp>
 
 #include <iostream>
 #include <cstring>
 
 int main (int argc, char** argv) {
+	argp_parse(&argp, argc, argv, 0, 0, 0);
+
 	std::cout << "Facecam2D is starting..." << std::endl;
 
 	initPrefixes();
@@ -13,8 +16,7 @@ int main (int argc, char** argv) {
 	std::cout << "Default asset prefix: " << prefixDefault << std::endl;
 
 	initGraphics();
-	//TODO: real argument parsing
+	initCV();
-	initCV(argc > 1 && strcmp(argv[1], "--haar-cascade") == 0);
 
 	while (true) {
 		cvFrame();