- /**
- Uploads a sub-image into the texture. Unlike full image upload, there are
- no constraints on the size of the sub-image.
- */
- void sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, PixelFormat fmt, DataType type, const void *data);
+ /** Updates a rectangular region of the texture. Storage must be defined
+ and allocated beforehand. The update region must be fully inside the
+ texture. */
+ void sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht,
+ PixelFormat fmt, DataType type, const void *data);
+
+ /** Uploads an image to the texture. If storage has not been defined, it
+ will be set to match the image. Otherwise the image must be compatible with
+ the defined storage.