merged all drawing functions into a single shader processing function

app/render/rendercache.h

@@ -0,0 +1,48 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2019 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#ifndef RENDERCACHE_H
+#define RENDERCACHE_H
+
+#include "codec/decoder.h"
+#include "project/item/footage/stream.h"
+
+OLIVE_NAMESPACE_ENTER
+
+template <typename K, typename V>
+class RenderCache : public QHash<K, V>
+{
+public:
+  QMutex *mutex()
+  {
+    return &mutex_;
+  }
+
+private:
+  QMutex mutex_;
+
+};
+
+using DecoderCache = RenderCache<Stream*, DecoderPtr>;
+using ShaderCache = RenderCache<QString, QVariant>;
+
+OLIVE_NAMESPACE_EXIT
+
+#endif // RENDERCACHE_H