#4 Animation Frame Interpolation Patch

[Mattias Cibien]

This adds animation frame interpolation (no pos/rot or shadows) and it is loosely based on what is found here for quake.

[Mattias Cibien]

If accepted I can continue to work on this providing both pos/rot and shadows.

[Ozkan Sezer]

Some pedantry:

• No author name comments: they are ugly, not a big fan. Instead,
  we usually give credit in docs/AUTHORS file.

• The new cvar is defined wrong: the last field is not a boolean
  but a flag, so it should be CVAR_ARCHIVE, not true.

• When checking a cvar's value as a boolean we use it's 'integer'
  member instead of 'value' when possible.

• Newly added 'Blended' procedures and the lastpose0 var should be
  static to gl_rmain.c.

• Additions to entity_t structure should be guarded by GLQUAKE
  because the patch only touches OpenGL path.

• Whitespace style should match other places.

Attached a revised patch which does the above changes.

Question: Have you extensively tested the patch in the whole game
in all episodes and maps, including the Portal of Praevus mission
pack? IIRC, this functionality can be a tricksy one.

[Mattias Cibien]

Here is the new patch with the modifications you asked.

Regarding testing: this was merely an excercise to explain frame interpolation to a collague so it was not exensively tested but I'll do my best to test it thorugh the game and the expansion.

[Ozkan Sezer]

but I'll do my best to test it thorugh the game and the expansion.

Yes please.

(BTW, your v2-patch still has some of the pedantic issues:
The one I attached above has things right.)

[Mattias Cibien]

Ok. I'll adjust the patch

[Steven]

Awesome matey, thanks. Ozkan's 0001 patch works fine for me on my Mac.