foundations for background caching

app/render/renderinstance.h

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+/***
+
+  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 GLINSTANCE_H
+#define GLINSTANCE_H
+
+#include <QMatrix4x4>
+#include <QOffscreenSurface>
+#include <QOpenGLContext>
+
+#include "render/rendermodes.h"
+#include "render/rendertypes.h"
+#include "render/texturebuffer.h"
+
+/**
+ * @brief An object containing all resources necessary for each thread to support hardware accelerated rendering
+ *
+ * RenderInstance contains everything that Nodes will need to draw with on a per-thread basis.
+ *
+ * In OpenGL,
+ */
+class RenderInstance : public QObject
+{
+public:
+  RenderInstance(const int& width,
+                 const int& height,
+                 const olive::PixelFormat& format,
+                 const olive::RenderMode& mode);
+
+  bool Start();
+
+  void Stop();
+
+  bool IsStarted();
+
+  TextureBuffer* buffer();
+
+private:
+  QOpenGLContext ctx_;
+
+  QOffscreenSurface surface_;
+
+  TextureBuffer buffer_;
+
+  int width_;
+
+  int height_;
+
+  olive::PixelFormat format_;
+
+  olive::RenderMode mode_;
+};
+
+#endif // GLINSTANCE_H