Adds GLES2 draw calls batching for the same render list item that uses
multiple rasterizer commands (e.g. Label node; a node with multiple
GDScript draw_* calls).
This commit unhacks some parts of the 3D rendering.
Most notably:
- possibility to use negative texture units
(no longer weird manual index allocation for user samplers)
- refactoring of light code, now sorts in a different way,
should yield better performance
- fixes a crash while saving (because of "Illegal instruction" execution)
when using a decent compiler (clang, it's clang. Thanks GCC for not telling me about UB).
This commit adds a new rendering backend, GLES2, and adds a
project setting to enable it.
Currently this backend can only be used on the X11 platform,
but integrating into other platforms is planned.
Thomas Herzog
Marcin Zawiejski
Juan Linietsky
toger5
Poommetee Ketson