Alpha Test, Scissor Test

Blend Stage

NEWc = Sc * Sf + Dc * Df (rdy on 2nd clock)

ZFLAG = Ztest (Sz, Dz)

Read Framebuffer Stage

Dz, Dc = ReadFramebuffer(address) (read on 1st clock)

Write Framebuffer Stage

If ((Zflag and Aflag and Sflag) = TRUE) then

WriteFramebuffer(address, NewC) (write on 2nd clock)

address, Sc, Sz, Aflag, Sflag

address, Sc, Dc, Dz, Aflag, Sflag

address, NEWc, Zflag, Aflag, Sflag

Address Calculation, Alpha Test, Scissor Test

Address = X * ScreenWidth + Y

Aflag = AlphaTest(AlphaRef, ScAlpha)

Sflag = (Xmin <= X <= Xmax)

Sc, Sz, X, Y

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