Here is a list of all documented enum values with links to the documentation:

• GRRLIB_BLEND_ADD : grrlib.h
• GRRLIB_BLEND_ALPHA : grrlib.h
• GRRLIB_BLEND_INV : grrlib.h
• GRRLIB_BLEND_MULTI : grrlib.h
• GRRLIB_BLEND_SCREEN : grrlib.h