- Load shader source from resource files.
- Correctly report material types: each material can use different
shaders depending on the video pixel format but it was reporting
a unique material type. This was causing the node to keep using
the same shader even if its pixel format changed.
Change-Id: Ib903ecd6e7dd1dd56d7cefe255ab7049933df17d
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>
