OpenTK.Math.Half

[license]
Well, citing non-lawyer answers in a court of law isn't going to help. Let's leave it as is for now, we're certainly on the safe side with the current state.

[v9]

• Added Half2 and Half3, tested and works.
• Removed a check for 0.0f in the Half constructors and FromSingle() methods (was unnecessary)
• Removed pack/size from Structlayout, to be on the safe side.
• General cleanup of docu, no more C++ references.
• Changed -0.0f to 0x8000 and removed check in Half.IsNaN property for it.
• Changed all (float) into (Single) in public methods/docu, because it's more explicit.

I'm really out of ideas now what should be added, and no known issues left.

I have committed the code with slight modifications and updated the license to display the OpenEXR terms (at least until we get an answer from OpenEXR).

Changes:

• Vector[234]h instead of Half[234], to match Vector[234]d.
• Renamed _internalBits to bits and made the field private.
• Refactored the From/ToBinaryStream methods of Vector[234]h to use Half.From/ToBinaryStream.
• Made Half -> Double / Single conversions implicit (like Single -> Double is implicit).
• Trimmed down the API.

As part of this work, I've completely rewritten the double structs (Vector[234]d, Matrix4d and Quaterniond) so that they match their single counterparts. There is still some work left to normalize all APIs (they are missing the binary read / write methods of Half), but that can wait a little.

What's left now is the GL <-> Half interop (which I'll add shortly). It would also be great to add unit tests to the math library, but that's a whole other discussion.

None, right now.

Closing issues fixed in 0.9.2.