https://www.khronos.org/registry/gles/extensions/OES/OES_mapbuffer.txt
This extension adds to the vertex buffer object functionality supported
by OpenGL ES 1.1 or ES 2.0 by allowing the entire data storage of a
buffer object to be mapped into the client's address space.
So this only applies to buffer objects (i.e. things created with
glGenBuffers). It should thus work with a buffer later (or earlier)
bound as a PBO (i.e. GL_PIXEL_PACK_BUFFER/GL_PIXEL_UNPACK_BUFFER), but
not with a texture or renderbuffer.
You might be interested in http://docs.gl/es3/glBindBuffer
Hope this helps,
-ilia
On Sat, Aug 1, 2015 at 9:02 PM, 凶恶的狼 <[email protected]> wrote:
> it did not work.
>
> off screen rendering might be a walkaround, but would it work for pixel
> buffer surface?
>
>
> thanks.
> hilbert
>
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