Adding Z-Test

Blend, Depth Test 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 = TRUE) then

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

address, Sc, Sz

address, Sc, Dc, Dz

address, NEWc, Zflag

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