Added floating point formats to validateColorBufferFormat, which is used by glCopyTexImage2D, since it was a missing part of the previously added floating point extensions. From the extension spec: https://www.khronos.org/registry/gles/extensions/EXT/EXT_color_buffer_half_float.txt "9. Should CopyTex[Sub]Image be supported for floating-point formats? [...] Yes." Change-Id: Ie14d8afd352b004e8a2400cfef16facdeab94e33 Reviewed-on: https://swiftshader-review.googlesource.com/5110Tested-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Nicolas Capens <capn@google.com>
