Add instancing check
Load instancing functions
ActiveAttrib support
Add getAttribLocation support
vertexattribpointer support
Enable/Disable attrib array support
User-facing instancing API
Extend the draw calls of Drivers
GL instancing drawing
Handle attrib info
Custom VA - a bit hacky
Consolidate the Mesh pointer: every MeshNode has it, so have it in one place
Also consolidate getMesh
Actually, draw_instanced is not necessary. It only provides the gl_InstanceID shader keyword.
Add override macro
Save the overrider script
Fix a GL driver bug - mismatching function
Add override annotations
API: Optionally skip colors
Actual skip