Only enable stdout/stderr log output after main initialisation

* This suppresses lines like "RenderDoc v0.31 x64 (...) loaded in replay
  application" which are only useful for the logfile and not for actual
  user output.

renderdoc/common/common.cpp

@@ -272,6 +272,13 @@ void rdclog_filename(const char *filename)
     logfile() = filename;
 }
 
+static bool log_output_enabled = false;
+
+void rdclog_enableoutput()
+{
+  log_output_enabled = true;
+}
+
 void rdclog_flush()
 {
 }
@@ -287,12 +294,12 @@ void rdclogprint_int(LogType type, const char *fullMsg, const char *msg)
 #endif
 #if defined(OUTPUT_LOG_TO_STDOUT)
   // don't output debug messages to stdout/stderr
-  if(type != RDCLog_Debug)
+  if(type != RDCLog_Debug && log_output_enabled)
     OSUtility::WriteOutput(OSUtility::Output_StdOut, msg);
 #endif
 #if defined(OUTPUT_LOG_TO_STDERR)
   // don't output debug messages to stdout/stderr
-  if(type != RDCLog_Debug)
+  if(type != RDCLog_Debug && log_output_enabled)
     OSUtility::WriteOutput(OSUtility::Output_StdErr, msg);
 #endif
 #if defined(OUTPUT_LOG_TO_DISK)

renderdoc/common/common.h

@@ -254,10 +254,13 @@ void rdclog_int(LogType type, const char *file, unsigned int line, const char *f
 
 const char *rdclog_getfilename();
 void rdclog_filename(const char *filename);
+void rdclog_enableoutput();
 
 #define RDCLOGFILE(fn) rdclog_filename(fn)
 #define RDCGETLOGFILE() rdclog_getfilename()
 
+#define RDCLOGOUTPUT() rdclog_enableoutput()
+
 #if(!defined(RELEASE) || defined(FORCE_DEBUG_LOGS)) && !defined(STRIP_DEBUG_LOGS)
 #define RDCDEBUG(...) rdclog(RDCLog_Debug, __VA_ARGS__)
 #else

renderdoc/core/core.cpp

@@ -322,6 +322,10 @@ void RenderDoc::Initialise()
       RecreateCrashHandler();
     }
   }
+
+  // begin printing to stdout/stderr after this point, earlier logging is debugging
+  // cruft that we don't want cluttering output
+  RDCLOGOUTPUT();
 }
 
 RenderDoc::~RenderDoc()