More convenient pixel format strings

[annevk]

"10-10-10-2" doesn't seem great. Are there no names for this kind of thing we could use?

[junov]

OpenGL uses this notation: RGB10_A2

[annevk]

Converted to a string enum that would be "rgb10-a2", which seems more reasonable to me.

[yell0wd0g]

It was indeed surprising to see float16, 8-8-8-8 (and, in the WhatWG Spec PR, 10-10-10-2). I guess the idea of avoiding OpenGL's Sized Internal Format (GL_RGBA16F, GL_RGBA8 and GL_RGB10_A2, respectively), is to not specify the channel endianness and using instead what the platform provides.

Alternatively, what we can do is to use OpenGL's Type which will give us: GL_UNSIGNED_BYTE, GL_UNSIGNED_INT_2_10_10_10_REV and GL_HALF_FLOAT, specifying the storage of the channels but leaving the channels undefined.

@fserb WDYT?

OpenGL's relevant Spec is glTexImage2D, see the Table 2 here.

[yell0wd0g]

I see now that 10-10-10-2 (and 12-12-12-12, for the case) were removed in #22 in an effort to simplify the options offered.