mono/MonoGame — pull request #1129 by slygamer (2012-12-31 06:14:54+00:00)
Title: Buffers are write-only on ES 2.0

Issue #1127 raised the problem of trying to read data from vertex buffers. Turns out the GL_OES_mapbuffer extension is write-only. Therefore I have added NotSupportedException to VertexBuffer.GetData() and IndexBuffer.GetData() for ES platforms.