File indexing completed on 2024-12-22 04:12:47

 /*
  *  SPDX-FileCopyrightText: 2021 Dmitry Kazakov <dimula73@gmail.com>
  *
  *  SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #ifndef KISOPENGLBUFFERCIRCULARSTORAGE_H
 #define KISOPENGLBUFFERCIRCULARSTORAGE_H
 
 #include <QScopedPointer>
 #include <QOpenGLBuffer>
 
 /**
  * A simple storage class that owns a fixed amount of
  * QOpenGLBuffer objects and returns them sequentially.
  * Using multiple distinct buffers lets us avoid blocks
  */
 class KisOpenGLBufferCircularStorage
 {
 public:
     struct BufferBinder
     {
         /**
          * When \p bufferStorage is non-null, fetches the
          * next buffer from the circular storage,  binds it
          * and loads the provided data into the buffer. After
          * loading the data pointer `*dataPtr` is reset to null
          * to signal that glTexImage2D should not be provided
          * with any pointer.
          *
          * When \p bufferStorage is null, the binder does nothing,
          * the data pointer `*dataPtr`is kept unchanged.
          */
         BufferBinder(KisOpenGLBufferCircularStorage *bufferStorage, const void **dataPtr, int dataSize);
         ~BufferBinder();
 
         BufferBinder(const BufferBinder &) = delete;
         BufferBinder &operator=(const BufferBinder &) = delete;
         BufferBinder(BufferBinder &&) = delete;
         BufferBinder &operator=(BufferBinder &&) = delete;
 
     private:
         QOpenGLBuffer *m_buffer = nullptr;
     };
 
     KisOpenGLBufferCircularStorage();
     KisOpenGLBufferCircularStorage(QOpenGLBuffer::Type type);
     ~KisOpenGLBufferCircularStorage();
 
     KisOpenGLBufferCircularStorage(const KisOpenGLBufferCircularStorage &) = delete;
     KisOpenGLBufferCircularStorage &operator=(const KisOpenGLBufferCircularStorage &) = delete;
     KisOpenGLBufferCircularStorage(KisOpenGLBufferCircularStorage &&) = delete;
     KisOpenGLBufferCircularStorage &operator=(KisOpenGLBufferCircularStorage &&) = delete;
 
     void allocate(int numBuffers, int bufferSize);
     QOpenGLBuffer* getNextBuffer();
     bool isValid() const;
     int size() const;
 
     void reset();
 
     void allocateMoreBuffers();
 
 private:
     void addBuffersImpl(size_t buffersToAdd, int bufferSize);
 
     struct Private;
     const QScopedPointer<Private> m_d;
 };
 
 #endif // KISOPENGLBUFFERCIRCULARSTORAGE_H