[gles] Handle cubemap copies #2725
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Description
Currently you can't copy a texture to a cubemap in the gles backend because it wrongly uses the
glow::TEXTURE_2Dtarget. I've pretty hackily set things up so we check how many array layers the target has, and if it has 6 then we write to the correct cubemap face.Testing
Tested in Chrome.
I get aFixed that now.WebGL: INVALID_OPERATION: bindTexture: textures can not be used with multiple targetserror but it functions at least.