The following table lists the available IRIS GL alpha test functions and their equivalent OpenGL functions.
| afunction | glAlphaFunc |
|---|---|
| AF_NOTEQUAL | GL_NOTEQUAL |
| AF_ALWAYS | GL_ALWAYS |
| AF_NEVER | GL_NEVER |
| AF_LESS | GL_LESS |
| AF_EQUAL | GL_EQUAL |
| AF_LEQUAL | GL_LEQUAL |
| AF_GREATER | GL_GREATER |
| AF_GEQUAL | GL_GEQUAL |