QVector<BufferSharedPtr>::iterator ShmPoolPrivate::reuseBuffer(const QSize &s,
qint32 stride,
Shm::Format format)
{
Q_Q(ShmPool);
// We can't return a shared pointer here so we just return
// the iterator of the buffers vector that can be used to
// retrieve the actual shared pointer
// Try to reuse an existing buffer
for (auto it = buffers.begin(); it != buffers.end(); ++it) {
QSharedPointer<Buffer> buffer = (*it);
// Skip buffers that are in use or do not match what the user is looking for
if (!buffer->isReleased() || buffer->isUsed())
continue;
if (buffer->size() != s || buffer->stride() != stride || buffer->format() != format)
continue;
// We found the buffer
buffer->setReleased(false);
return it;
}
// No buffer found: resize the pool to accomodate a new buffer
const qint32 bytesCount = s.height() * stride;
if (offset + bytesCount > size) {
if (!resizePool(bytesCount + size))
return Q_NULLPTR;
}
// No buffer can be reused, create a new one and advance the offset
wl_buffer *nativeBuffer =
create_buffer(offset, s.width(), s.height(), stride, format);
if (!nativeBuffer)
return Q_NULLPTR;
Buffer *buffer = new Buffer(q, s, stride, offset, format);
BufferPrivate::get(buffer)->init(nativeBuffer);
offset += bytesCount;
return buffers.insert(buffers.end(), BufferSharedPtr(buffer));
}
const BufferSharedPtr & VertexAttributeSet::getVertexBuffer(unsigned int attrib) const
{
return BufferSharedPtr ();
}