/// <summary>
/// </summary>
protected override void UnlockImpl()
{
if (this._lockedToScratch)
{
if (this._scratchUploadOnUnlock)
{
// have to write the data back to vertex buffer
this.WriteData(this._scratchOffset, this._scratchSize, this._scratchPtr, this._scratchOffset == 0 && this._scratchSize == sizeInBytes);
}
// deallocate from scratch buffer
((GLES2HardwareBufferManager)HardwareBufferManager.Instance).DeallocateScratch(this._scratchPtr);
this._lockedToScratch = false;
}
else
{
OpenGL.BindBuffer(All.ElementArrayBuffer, this._bufferId);
GLES2Config.GlCheckError(this);
if (!OpenGLOES.UnmapBuffer(All.ElementArrayBuffer))
{
throw new AxiomException("Buffer data corrupted, please reload");
}
}
isLocked = false;
}
/// <summary>
/// </summary>
/// <param name="offset"> </param>
/// <param name="length"> </param>
/// <param name="locking"> </param>
/// <returns> </returns>
protected override BufferBase LockImpl(int offset, int length, BufferLocking locking)
{
All access = 0;
if (isLocked)
{
throw new AxiomException("Invalid attempt to lock an index buffer that has already been locked");
}
BufferBase retPtr = null;
if (length < MapBufferThreshold)
{
retPtr = ((GLES2HardwareBufferManager)HardwareBufferManager.Instance).AllocateScratch(length);
if (retPtr != null)
{
this._lockedToScratch = true;
this._scratchOffset = offset;
this._scratchSize = length;
this._scratchPtr = retPtr;
this._scratchUploadOnUnlock = (locking != BufferLocking.ReadOnly);
if (locking != BufferLocking.Discard)
{
this.ReadData(offset, length, retPtr);
}
}
}
else
{
throw new AxiomException("Invalid Buffer lockSize");
}
if (retPtr == null)
{
OpenGL.BindBuffer(All.ElementArrayBuffer, this._bufferId);
GLES2Config.GlCheckError(this);
// Use glMapBuffer
if (locking == BufferLocking.Discard)
{
OpenGL.BufferData(All.ElementArrayBuffer, new IntPtr(sizeInBytes), IntPtr.Zero, GLES2HardwareBufferManager.GetGLUsage(usage));
GLES2Config.GlCheckError(this);
}
if ((usage & BufferUsage.WriteOnly) != 0)
{
access = All.WriteOnlyOes;
}
IntPtr pBuffer = OpenGLOES.MapBuffer(All.ElementArrayBuffer, access);
GLES2Config.GlCheckError(this);
if (pBuffer == IntPtr.Zero)
{
throw new AxiomException("Index Buffer: Out of memory");
}
unsafe
{
// return offset
retPtr = BufferBase.Wrap(pBuffer, sizeInBytes);
}
this._lockedToScratch = false;
}
isLocked = true;
return(retPtr);
}