started memory cache server

rendering/memorycache.h

@@ -0,0 +1,58 @@
+#ifndef MEMORYCACHE_H
+#define MEMORYCACHE_H
+
+#include <QList>
+#include <QMutex>
+
+#include "framebufferobject.h"
+
+class MemoryCache
+{
+public:
+  class Reference {
+  public:
+    Reference(MemoryCache* cache);
+    ~Reference();
+
+    FramebufferObject* buffer();
+
+    void Relinquish();
+  private:
+    void Request();
+
+    MemoryCache* cache_;
+    int buffer_;
+  };
+
+  MemoryCache();
+  ~MemoryCache();
+
+  void SetParameters(QOpenGLContext* ctx, int width, int height);
+
+private:
+  int RequestBuffer(Reference *r);
+  int RequestBufferInternal(Reference *r);
+
+  void RelinquishBuffer(int index);
+
+  FramebufferObject *Buffer(int index);
+
+  bool OutOfMemory();
+
+  void Clear();
+
+  QList<FramebufferObject> buffers_;
+  QList<Reference*> refs_;
+  QList<time_t> access_times_;
+
+  QOpenGLContext* ctx_;
+
+  QList<int> relinquished_buffers_;
+
+  int width_;
+  int height_;
+
+  QMutex buffer_array_mutex_;
+};
+
+#endif // MEMORYCACHE_H