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Re: [Public WebGL] WEBGL_get_buffer_sub_data_async

On Thu, Dec 21, 2017 at 11:07 PM, Kai Ninomiya <kainino@google.com> wrote:
* We should be able to eventually eliminate a memcpy by, in (a) multi-process browsers, using SharedArrayBuffers backed by IPC shared memory, and in (b) single-process browsers, using SharedArrayBuffers backed by glMapBuffer memory. It might essentially be exposed to WebGL like a read-only MapBuffer operation, maybe for GL_*_READ buffers only. Ideally in both cases, the SharedArrayBuffer would be read-only, which is not a concept that currently exists.

Afaik you cannot simultaneously create IPC shared memory and have it be the memory region mapped by glMapBuffer.