Calculate circle vertex coordinates

if filled use triangles
if empty use lines or triangles

nope
You have, for example, 4 color textures and 1 splat texture. You read the splat texture and decide which color texture should be used for this fragment.
Example here...

What?
The windows binaries that comes with the package are
6.35MB debug dll + 0.227MB debug lib
4.41MB release dll + 0.227MB release lib
I have no idea how you came up with 130MB size debug...

As far as I know .obj doesnt support animation.
As for loading the animations and models, I suggest using assimp http://assimp.sourceforge.net/.
You can get the model and animation data out quite...

Have you tried moving the vertex shader color calculations to fragment shader ?

If you dont want to be limited to 3DS models only, I suggest you look into assimp http://assimp.sourceforge.net/
It can load different models into an intermediate format that you can easily parse...