From 46e0af78b821979029c3db50e353192384583f23 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Sun, 31 Mar 2013 15:44:43 +0200
Subject: [PATCH] add command-line option for swap interval

---
 Makefile   |  4 ++--
 gltest.cpp | 26 +++++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 3074580..c07c0fc 100644
--- a/Makefile
+++ b/Makefile
@@ -6,10 +6,10 @@ COMMON_HDR = glwindow.h
 all: glxtest egltest eglinfo
 
 glxtest: $(COMMON_SRC) $(COMMON_HDR) glxbackend.cpp glxbackend.h
-	g++ $(FLAGS) -DUSE_GLX $(COMMON_SRC) glxbackend.cpp -lGL -lX11 -o glxtest
+	g++ $(FLAGS) -DUSE_GLX $(COMMON_SRC) glxbackend.cpp -lGL -lX11 -lboost_program_options -o glxtest
 
 egltest: $(COMMON_SRC) $(COMMON_HDR) eglbackend.cpp eglbackend.h
-	g++ $(FLAGS) -DUSE_EGL $(COMMON_SRC) eglbackend.cpp -lEGL -lGL -lX11 -o egltest
+	g++ $(FLAGS) -DUSE_EGL $(COMMON_SRC) eglbackend.cpp -lEGL -lGL -lX11 -lboost_program_options -o egltest
 
 eglinfo: eglinfo.c
 	gcc $(FLAGS) eglinfo.c -lEGL -lGL -lX11 -o eglinfo
diff --git a/gltest.cpp b/gltest.cpp
index 2b6105c..8d296a3 100644
--- a/gltest.cpp
+++ b/gltest.cpp
@@ -7,6 +7,9 @@
 #include <unistd.h>
 #include <assert.h>
 #include <GL/gl.h>
+#include <boost/program_options.hpp>
+
+namespace po = boost::program_options;
 
 // include proper GL connector
 #include "glwindow.h"
@@ -53,10 +56,13 @@ public:
 	TearTestWindow() : GLWindow(XOpenDisplay(0), createGLBackend()), boxPos(0), boxDirection(1)
 	{}
 
+	void setSwapInterval(int i) {
+		getBackend()->setSwapInterval(i);
+	}
+
 protected:
 	virtual void initGL()
 	{
-		getBackend()->setSwapInterval(1);
 		// initialize GL proper
 		glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
 		glDisable(GL_DEPTH_TEST);
@@ -179,7 +185,25 @@ private:
 
 int main(int argc, char ** argv)
 {
+	// program options handling
+	po::options_description desc("Allowed options");
+	desc.add_options()
+		("help,h", "produce help message")
+		("swap-interval,i", po::value<int>(), "set swap interval")
+	;
+	po::variables_map vm;
+	po::store(po::parse_command_line(argc, argv, desc), vm);
+	po::notify(vm);
+
+	if (vm.count("help")) {
+		std::cout << desc << "\n";
+		return 1;
+	}
+
+	// actual program
 	TearTestWindow w;
 	w.open(800, 600);
+	if (vm.count("swap-interval"))
+		w.setSwapInterval(vm["swap-interval"].as<int>());
 	w.exec();
 }
-- 
2.30.2