public void LimitVertexBuffers(int vertexCount)
{
// Is it possible for the draw to fetch outside the bounds of any vertex buffer currently bound?
if (vertexCount <= _minVertexCount)
{
return;
}
// If the draw can fetch out of bounds, let's ensure that it will only fetch zeros rather than memory garbage.
int currentTempVbOffset = 0;
uint buffersInUse = _vertexBuffersInUse;
while (buffersInUse != 0)
{
int vbIndex = BitOperations.TrailingZeroCount(buffersInUse);
ref var vb = ref _vertexBuffers[vbIndex];
int requiredSize = vertexCount * vb.Stride;
if (vb.Buffer.Size < requiredSize)
{
BufferHandle tempVertexBuffer = EnsureTempVertexBufferSize(currentTempVbOffset + requiredSize);
Buffer.Copy(vb.Buffer.Handle, tempVertexBuffer, vb.Buffer.Offset, currentTempVbOffset, vb.Buffer.Size);
Buffer.Clear(tempVertexBuffer, currentTempVbOffset + vb.Buffer.Size, requiredSize - vb.Buffer.Size, 0);
GL.BindVertexBuffer(vbIndex, tempVertexBuffer.ToInt32(), (IntPtr)currentTempVbOffset, vb.Stride);
currentTempVbOffset += requiredSize;
_vertexBuffersLimited |= 1u << vbIndex;
}
buffersInUse &= ~(1u << vbIndex);
}
public void CopyBuffer(BufferHandle source, BufferHandle destination, int srcOffset, int dstOffset, int size)
{
Buffer.Copy(source, destination, srcOffset, dstOffset, size);
}
public void SetRangeOfIndexBuffer()
{
Buffer.Resize(_tempIndexBuffer, _indexBuffer.Size);
Buffer.Copy(_indexBuffer.Handle, _tempIndexBuffer, _indexBuffer.Offset, 0, _indexBuffer.Size);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, _tempIndexBuffer.ToInt32());
}
