/// <summary>
/// Used to lock a vertex buffer in hardware memory in order to make modifications.
/// </summary>
/// <param name="offset">Starting index in the buffer to lock.</param>
/// <param name="length">Nunber of bytes to lock after the offset.</param>
/// <param name="locking">Specifies how to lock the buffer.</param>
/// <returns>An array of the <code>System.Type</code> associated with this VertexBuffer.</returns>
public virtual IntPtr Lock(int offset, int length, BufferLocking locking)
{
Debug.Assert(!isLocked, "Cannot lock this buffer because it is already locked.");
IntPtr data = IntPtr.Zero;
if (useShadowBuffer)
{
if (locking != BufferLocking.ReadOnly)
{
// we have to assume a read / write lock so we use the shadow buffer
// and tag for sync on Unlock()
shadowUpdated = true;
}
data = shadowBuffer.Lock(offset, length, locking);
}
else
{
// lock the real deal and flag it as locked
data = this.LockImpl(offset, length, locking);
isLocked = true;
}
lockStart = offset;
lockSize = length;
return(data);
}
/// <summary>
/// Copy data from another buffer into this one.
/// </summary>
/// <param name="srcBuffer">The buffer from which to read the copied data.</param>
/// <param name="srcOffset">Offset in the source buffer at which to start reading.</param>
/// <param name="destOffset">Offset in the destination buffer to start writing.</param>
/// <param name="length">Length of the data to copy, in bytes.</param>
/// <param name="discardWholeBuffer">If true, will discard the entire contents of this buffer before copying.</param>
public virtual void CopyData(HardwareBuffer srcBuffer, int srcOffset, int destOffset, int length, bool discardWholeBuffer)
{
// lock the source buffer
IntPtr srcData = srcBuffer.Lock(srcOffset, length, BufferLocking.ReadOnly);
// write the data to this buffer
this.WriteData(destOffset, length, srcData, discardWholeBuffer);
// unlock the source buffer
srcBuffer.Unlock();
}
/// <summary>
/// Copy data from another buffer into this one.
/// </summary>
/// <param name="srcBuffer">The buffer from which to read the copied data.</param>
/// <param name="srcOffset">Offset in the source buffer at which to start reading.</param>
/// <param name="destOffset">Offset in the destination buffer to start writing.</param>
/// <param name="length">Length of the data to copy, in bytes.</param>
/// <param name="discardWholeBuffer">If true, will discard the entire contents of this buffer before copying.</param>
public virtual void CopyData(HardwareBuffer srcBuffer, int srcOffset, int destOffset, int length, bool discardWholeBuffer)
{
// lock the source buffer
IntPtr srcData = srcBuffer.Lock(srcOffset, length, BufferLocking.ReadOnly);
// write the data to this buffer
this.WriteData(destOffset, length, srcData, discardWholeBuffer);
// unlock the source buffer
srcBuffer.Unlock();
}
