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vrend: Check whether certain resources are backed by an OpenGL resources

First rename id to gl_id to make sure what kind of ID we have in the resource. This makes it also clearer that a value of 0 means that a resource is not backed by a GL resource.

With that, consider that it is possible to create a resource with PIPE_BIND_CUSTOM and this this case they are only backed by host memory, but not by and OpenGL resource. Trying to bind such a resource may later lead to crashes, because the host OpenGL implementation will assume that data is not provided by a GL resource and will interpret the value that is an offset into the GL resource as a host pointer. Make sure that we don't try to use a resource created with PIPE_BIND_CUSTOM in these cases.


Edited by Gert Wollny

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