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.

libobs/graphics/graphics.h

@@ -414,9 +414,8 @@ struct gs_window {
 	void                    *hwnd;
 #elif defined(__APPLE__)
 	__unsafe_unretained id  view;
-#elif defined(__posix__)
-	int bla;
-	/* TODO */
+#elif defined(__linux__)
+	uint32_t id;
 #endif
 };
 

libobs/obs-nix.c

@@ -16,17 +16,52 @@
 ******************************************************************************/
 
 #include <stdlib.h>
-
+#include <stdio.h>
+#include <unistd.h>
 #include "util/dstr.h"
 #include "obs.h"
 
+static inline bool check_path(const char* data, const char *path, struct dstr * output)
+{
+	dstr_copy(output, path);
+	dstr_cat(output, data);
+	
+    blog(LOG_INFO, "Attempting path: %s\n", output->array);
+	
+	return access(output->array, R_OK) == 0;
+}
+
+static inline bool check_lib_path(const char* data, const char *path, struct dstr *output)
+{
+	bool result = false;
+	struct dstr tmp;
+	
+    dstr_init_copy(&tmp, "lib");
+    dstr_cat(&tmp, data);
+	dstr_cat(&tmp, ".so");
+	result = check_path(tmp.array, path, output); 
+	
+	dstr_free(&tmp);
+	
+	return result;
+}
+
 /*
  *   /usr/local/lib/obs-plugins
  *   /usr/lib/obs-plugins
  */
 char *find_plugin(const char *plugin)
-{
-	/* TODO */
+{ 
+	struct dstr output;
+	dstr_init(&output);
+
+	if (check_lib_path(plugin, "/usr/local/lib/obs-plugins/", &output))
+		return output.array;
+
+	if (check_lib_path(plugin, "/usr/lib/obs-plugins/", &output))
+		return output.array;
+
+	dstr_free(&output);
 	return NULL;
 }
 
@@ -36,7 +71,16 @@ char *find_plugin(const char *plugin)
  */
 char *find_libobs_data_file(const char *file)
 {
-	/* TODO */
+	struct dstr output;
+		dstr_init(&output);
+
+	if (check_path(file, "/usr/local/share/libobs/", &output))
+		return output.array;
+
+	if (check_path(file, "/usr/share/libobs/", &output))
+		return output.array;
+
+	dstr_free(&output);
 	return NULL;
 }
 
@@ -45,7 +89,16 @@ char *find_libobs_data_file(const char *file)
  *   /usr/share/obs-plugins
  */
 char *obs_find_plugin_file(const char *file)
-{
-	/* TODO */
-	return NULL;
+{ 	
+    struct dstr output;
+    dstr_init(&output);
+
+    if (check_path(file, "/usr/local/share/obs-plugins/", &output))
+        return output.array;
+
+    if (check_path(file, "/usr/share/obs-plugins", &output))
+        return output.array;
+
+    dstr_free(&output);
+    return NULL;
 }