add debug markers for easier gl debugging

include/llmr/util/string.hpp

@@ -6,13 +6,18 @@
 namespace llmr {
 namespace util {
 
-template<typename... Args>
+template<size_t max, typename... Args>
 inline std::string sprintf(const char *msg, Args... args) {
-    char res[1024];
+    char res[max];
     int len = snprintf(res, sizeof(res), msg, args...);
     return std::string(res, len);
 }
 
+template<size_t max, typename... Args>
+inline std::string sprintf(const std::string &msg, Args... args) {
+    return sprintf<max>(msg.c_str(), args...);
+}
+
 }
 }