Alpha Test

• Compare alpha value of NEW fragment with a reference value, reject or accept new fragment.

  • GL_NEVER never accept fragment
  • GL_ALWAYS always accept fragment
  • GL_LESS accept if fragment < ref
  • GL_LEQUAL accept if fragment <= ref
  • GL_EQUAL accept if fragment = ref
  • GL_GEQUAL accept if fragment > ref
  • GL_NOTEQUAL accept if fragment /= ref

• Simple unsigned comparator with flags (EQ, GT, LT).

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