Add option for indexed vertices for buffers to be used with the mesh component.

[Lerg]

Is your feature request related to a problem? Please describe (REQUIRED):
When working with meshes you often have to deal with a lot of duplicate vertices. For instance for grids and 9-Patch images.
Indexed vertices make it much easier to work with.

Describe the solution you'd like (REQUIRED):
Add an option for meshes and buffers to support indexed. Solar2D has a good implementation of it https://docs.coronalabs.com/api/library/display/newMesh.html

Describe alternatives you've considered (REQUIRED):
Working with non-indexed vertices is possible, but more tedious.

[Morgerion]

I’ve hit a ceiling around 40M polygons because Defold’s Mesh component doesn’t support index buffers. I added LODs, but I still can’t get the polygon count below 20M - which is pretty depressing. Even with impostors, it’s still a huge amount: impostors will save frame time but not memory, since those 20M polygons still sit in RAM.
So index buffers are absolutely necessary!
https://youtu.be/noOx4__GI0w

[subsoap]

+1

[subsoap]

Defold doesn't have index buffers... I need to regen the triangles in a trilist (even if its a strip or fan).. thats a little annoying and for big models.. will not be great.