Mildly improves rendering performance by caching OpenGL resources.
Namely:
- Cache shader program, VBO/EBO, and textures per output
- Automatically free image data after GPU upload
- Force RGBA format for consistent texture handling
- Track texture state across output changes
- Add texture invalidation on image changes
This reduces the memory usage by a solid 30MB, but it's still not quite
enough. I expect (or rather, hope) that we can cut it by half.
Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I6a6a6964eebc783c5bc07b1fef7548a8d49f529c
