various: enabled config saving

app/render/audioplaybackcache.cpp

@@ -238,11 +238,11 @@ QList<TimeRange> AudioPlaybackCache::GetValidRanges(const TimeRange& range, cons
 
 void AudioPlaybackCache::UpdateFilename(const QString &s)
 {
-  filename_ = QDir(GetCacheFilename()).filePath(s);
+  filename_ = QDir(GetCacheDirectory()).filePath(s);
   filename_.append(QStringLiteral(".pcm"));
 }
 
-const QString &AudioPlaybackCache::GetCacheFilename() const
+const QString &AudioPlaybackCache::GetPCMFilename() const
 {
   return filename_;
 }

app/render/audioplaybackcache.h

@@ -46,7 +46,7 @@ public:
 
   //void SetUuid(const QUuid& id);
 
-  const QString& GetCacheFilename() const;
+  const QString& GetPCMFilename() const;
 
   QList<TimeRange> GetValidRanges(const TimeRange &range, const qint64 &job_time);
 

app/render/backend/opengl/openglproxy.cpp

@@ -297,9 +297,12 @@ QVariant OpenGLProxy::RunNodeAccelerated(const Node *node,
 
     switch (data_type) {
     case NodeInput::kInt:
+      // kInt technically specifies a LongLong, but OpenGL doesn't support those. This may lead to
+      // over/underflows if the number is large enough, but the likelihood of that is quite low.
       shader->setUniformValue(variable_location, value.toInt());
       break;
     case NodeInput::kFloat:
+      // kFloat technically specifies a double but as above, OpenGL doesn't support those.
       shader->setUniformValue(variable_location, value.toFloat());
       break;
     case NodeInput::kVec2: