We used Gorkin Glass. It was an expensive proposition, but worth it to me. I'll look for my bathroom thread where you can see pictures.
About mid-way down this page, you can see some photos of our glass shower over bath doors.
Adler Glass Roland 973-743-8898 Great work. Competitive pricing.Nice guy.
If this is a standard recessed installation bathtub ( like in soda's picture) no need to go to an expensive custom glass place.
Just order a ready to go Century sliding door, framed or semi frameless from Kantor Supply in Orange and have a good handyman or plumber install.
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mesh