[Bug 88905] [SNB+ Bisected]Ogles3conform ES3-CTS.gtf.GL3Tests.packed_pixels.packed_pixels fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88905

--- Comment #8 from Tapani Pälli <lemody at gmail.com> ---
Now I understand the problem. OES_texture_float does not specify floating point
render target support. Our implementation has this because it is 'expected' by
the corresponding WebGL extension. Related discussion in the khronos public
bugzilla:

https://www.khronos.org/bugzilla/show_bug.cgi?id=729

There's also bunch of bugs in the internal bugzilla. WebGL extension
specification mentions that new implementation should not implement render
target support but implement WEBGL_color_buffer_float which maps with 
EXT_color_buffer_half_float:

https://www.khronos.org/registry/webgl/extensions/OES_texture_float/

So, to put it short our implementation is wrong in allowing render targets to
be created with GL_FLOAT and GL_HALF_FLOAT. Unfortunately fixing this means
that we will loose some nice deferred rendering webgl demos enabled by current
implementation, we could think of having override to allow this later (?) Will
investigate a proper fix.

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