mesa: refactor floating point texture fbo completeness check on gles

Patch introduces a helper function for checking the completeness and
fixes some of the existing checking in is_format_color_renderable. This
is done as preparation for EXT_color_buffer_half_float support.

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6491>
1 file changed