Steps to Reproduce: Go to the page https://jsfiddle.net/b1pgLwwn/ on an iOS device. Attach the device to a Mac and debug the page in Safari. Press the 'Run' button in the jsfiddle Expected Results: No errors. The texture should be filled with the Uint16Array data. Actual Results: You get the following error: WebGL: INVALID_OPERATION: texImage2D: type HALF_FLOAT_OES but ArrayBufferView is not NULL
I get this error as well
I found this behavior as well when developing http://cornelius.patatap.com/ • iOS refused both float32Array for Floating Point Textures as well as the Half Float Type described by nkronlage@
The jsfiddle still throws an error on Safari 12 on my iPad.
<rdar://problem/45500207>
Unity3D engine runs into this issue as well. Safari 8 - Safari 12 are affected. Tested as a workaround to use GL.texImage2D(..., null); to create an uninitialized texture, but then immediately afterwards using GL.texSubImage2D(..., /*type=*/0x8d61/*GL_HALF_FLOAT_OES*/, uint16Array); to upload the content, but unfortunately that fails too, i.e. GL.texSubImage2D() neither allows passing a half-float array. Also tried a workaround to pass a Float32Array, or a Float64Array instead of a Uint16Array, wishfully thinking that perhaps the error message would be wrong, and half-float textures could be populated by submitting another array type instead, but that does not work either. As result, Unity3D support of half-float textures is disabled, which prevents Safari from running new Unity3D content, which utilize half-floats.
To be more precise, it looks like the issue affects both iOS and macOS systems (not just iOS).
WIll be fixed by https://bugs.webkit.org/show_bug.cgi?id=169999 *** This bug has been marked as a duplicate of bug 169999 ***