Create any parent directory required for log file

renderdoc/core/core.cpp

@@ -736,6 +736,8 @@ void RenderDoc::SetLogFile(const char *logFile)
 
 	if(m_LogFile.substr(m_LogFile.length()-4) == ".rdc")
 		m_LogFile = m_LogFile.substr(0, m_LogFile.length()-4);
+
+	FileIO::CreateParentDirectory(m_LogFile);
 }
 
 void RenderDoc::SetProgress(LoadProgressSection section, float delta)

renderdoc/os/linux/linux_stringio.cpp

@@ -145,6 +145,30 @@ namespace FileIO
 		return ret + filename;
 	}
 
+	void CreateParentDirectory(const string &filename)
+	{
+		string fn = dirname(filename);
+
+		// want trailing slash so that we create all directories
+		fn.push_back('/');
+
+		if(fn[0] != '/')
+			return;
+
+		size_t offs = fn.find('/', 1);
+
+		while(offs != string::npos)
+		{
+			// create directory path from 0 to offs by NULLing the
+			// / at offs, mkdir, then set it back
+			fn[offs] = 0;
+			mkdir(fn.c_str(), S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
+			fn[offs] = '/';
+
+			offs = fn.find_first_of('/', offs+1);
+		}
+	}
+
 	string GetFullPathname(const string &filename)
 	{
 		char path[512] = {0};

renderdoc/os/os_specific.h

@@ -177,6 +177,8 @@ namespace FileIO
 	string GetAppFolderFilename(const string &filename);
 	string GetReplayAppFilename();
 
+	void CreateParentDirectory(const string &filename);
+
 	string GetFullPathname(const string &filename);
 
 	void GetExecutableFilename(string &selfName);

renderdoc/os/win32/win32_stringio.cpp

@@ -170,6 +170,20 @@ namespace FileIO
 		return StringFormat::Wide2UTF8(wstring(path));
 	}
 
+	void CreateParentDirectory(const string &filename)
+	{
+		wstring wfn = StringFormat::UTF82Wide(filename);
+
+		wfn = dirname(wfn);
+
+		// This function needs \\s not /s. So stupid!
+		for(size_t i=0; i < wfn.size(); i++)
+			if(wfn[i] == L'/')
+				wfn[i] = L'\\';
+
+		SHCreateDirectoryExW(NULL, wfn.c_str(), NULL);
+	}
+
 	string GetReplayAppFilename()
 	{
 		HMODULE hModule = NULL;