GLX implementation and *nix-specific file handling implementation

I added gl-x11 which allows compatibility with X11 (Xlib-based) and GLX.
I also added various functions to handle file finding based on FHS.
Various changes to autotools to both install files correctly and to configure correctly.

obs/makefile.am

@@ -33,5 +33,7 @@ obs_SOURCES += platform-osx.mm
 endif
 
 if OS_NIX
+obs_CPPFLAGS = $(AM_CPPFLAGS) $(GTK_CFLAGS) $(X11_CFLAGS) $(XINERAMA_CFLAGS)
 obs_SOURCES += platform-x11.cpp
+obs_LDADD += $(GTK_LIBS) $(X11_LIBS) $(XINERAMA_LIBS)
 endif

obs/platform-x11.cpp

@@ -14,19 +14,78 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
-
+/* Here we use xinerama to fetch data about monitor geometry
+ * Even if there are not multiple monitors, this should still work. 
+ */
+#include <X11/Xlib.h>
+#include <X11/extensions/Xinerama.h>
+#include <unistd.h>
 #include <sstream>
+
 #include "platform.hpp"
 using namespace std;
 
+static inline bool check_path(const char* data, const char *path, string &output)
+{
+	ostringstream str;
+	str << "/usr/local/share/obs-studio/" << data;
+	output = str.str();
+		
+	printf("Attempted path: %s\n", output.c_str());
+		
+	return (access(output.c_str(), R_OK) == 0);
+}
+
 bool GetDataFilePath(const char *data, string &output)
 {
-	// TODO
+	char *data_path = getenv("OBS_DATA_PATH");
+	if (data_path != NULL) {
+		if (check_path(data, data_path, output))
+			return true;
+	}
+	
+	if (check_path(data, "/usr/local/share/obs-studio/", output))
+		return true;
+	
+	if (check_path(data, "/usr/share/obs-studio/", output))
+		return true;
+	
 	return false;
 }
 
 void GetMonitors(vector<MonitorInfo> &monitors)
 {
+	int num_screens;
+	XineramaScreenInfo *screens;
+	int event_code = 0, error_code = 0;
+	Display* display = XOpenDisplay(NULL);
+	
+	if (!XineramaQueryExtension(display, &event_code, &error_code)) {
+		printf("Xinerama extension unavailable. We don't handle this yet.\n");
+		return;
+	}
+	
+	/* Do I need to make a call to XineramaQueryVersion...? */
+	
+	screens = XineramaQueryScreens(display, &num_screens);
+	
+	if (num_screens == 0 || !screens) { 
+		printf("Xinerama isn't active on this screen.\n");
+		return;
+	}
+	
 	monitors.clear();
-	// TODO
+	
+	do {
+		--num_screens;
+		
+		monitors.emplace_back(
+			screens[num_screens].x_org, 
+			screens[num_screens].y_org,
+			screens[num_screens].width,
+			screens[num_screens].height
+                );
+	} while (num_screens > 0);
+	
+	XCloseDisplay(display);
 }

obs/wx-wrappers.cpp

@@ -23,6 +23,14 @@
 #include <memory>
 using namespace std;
 
+#ifdef __linux__
+#include <gdk/gdkx.h>
+#include <gtk/gtk.h>
+#endif
+
+#include <memory>
+using namespace std;
+
 gs_window WxToGSWindow(const wxWindow *wxwin)
 {
 	gs_window window;
@@ -31,7 +39,7 @@ gs_window WxToGSWindow(const wxWindow *wxwin)
 #elif _WIN32
 	window.hwnd     = wxwin->GetHandle();
 #else
-	/* TODO: linux stuff */
+	window.id 	= gdk_x11_drawable_get_xid(gtk_widget_get_window(wxwin->GetHandle()));
 #endif
 	return window;
 }