disable brush start curve for other than iOS, frames capture for Windows, fix frame dt

engine/app.cpp

@@ -81,6 +81,7 @@ void App::initLog()
     CHAR path[MAX_PATH];
     GetCurrentDirectoryA(sizeof(path), path);
     data_path = path;
+    rec_path = data_path + "\\frames";
 #endif
 
     LogRemote::I.start();
@@ -440,12 +441,18 @@ void App::rec_start()
 {
     if (!rec_running)
     {
+#if defined(__IOS__) || defined(__OSX__)
         NSString* path = [NSString stringWithUTF8String:rec_path.c_str()];
         NSArray *dirFiles = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:nil];
         NSArray *jpgFiles = [dirFiles filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"self ENDSWITH '.jpg'"]];
         rec_count = (int)[jpgFiles count];
         update_rec_frames();
         rec_thread = std::thread(&App::rec_loop, this);
+#else
+        rec_count = Asset::list_files(rec_path, false, ".*\\.jpg").size();
+        update_rec_frames();
+        rec_thread = std::thread(&App::rec_loop, this);
+#endif
     }
 }