Marek Olšák <mar...@gmail.com> writes: > This WebGL test sets width and height to 0: > https://www.khronos.org/registry/webgl/sdk/tests/conformance/misc/type-conversion-test.html
I don't see it being undefined, it just inherits behavior from teximage: "CopyTexImage2D... defines a two-dimensional texture array in exactly the manner of TexImage2D, except that the image data are taken from the framebuffer rather than from client memory."
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