show missing preloaded image/audio files only once

2 files changed, 10 insertions, 2 deletions

diff --git a/src/library_sdl.js b/src/library_sdl.js
index a72c71bd..934c05d6 100644
--- a/src/library_sdl.js
+++ b/src/library_sdl.js
@@ -801,7 +801,7 @@ var LibrarySDL = {
     filename = FS.standardizePath(Pointer_stringify(filename));
     var raw = preloadedImages[filename];
     if (!raw) {
-      Module.printErr('Cannot find preloaded image ' + filename);
+      Runtime.warnOnce('Cannot find preloaded image ' + filename);
       return 0;
     }
     var surf = SDL.makeSurface(raw.width, raw.height, 0, false, 'load:' + filename);
@@ -917,7 +917,7 @@ var LibrarySDL = {
     filename = FS.standardizePath(Pointer_stringify(filename));
     var raw = preloadedAudios[filename];
     if (!raw) {
-      Module.printErr('Cannot find preloaded audio ' + filename);
+      Runtime.warnOnce('Cannot find preloaded audio ' + filename);
       return 0;
     }
     var id = SDL.audios.length;
diff --git a/src/runtime.js b/src/runtime.js
index 5e3dcdcc..0674f624 100644
--- a/src/runtime.js
+++ b/src/runtime.js
@@ -315,6 +315,14 @@ var Runtime = {
     return ret;
   },
 
+  warnOnce: function(text) {
+    if (!warnOnce.shown) warnOnce.shown = {};
+    if (!warnOnce.shown[text]) {
+      warnOnce.shown[text] = 1;
+      Module.printErr(text);
+    }
+  },
+
 #if RUNTIME_DEBUG
   debug: true, // Switch to false at runtime to disable logging at the right times