Fog

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)

Sc = Sc * FogFactor + FogColor * (1-FogFactor)

Write Framebuffer Stage

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

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

address, Sc, Sz, Aflag, Sflag, FogFactor

address, Sc, Dc, Dz, Aflag, Sflag

address, NEWc, Zflag, Aflag, Sflag

Address Calculation, Alpha Test, Scissor Test, Fog Blend

Address = X * ScreenWidth + Y

Aflag = AlphaTest(AlphaRef, ScAlpha)

Sflag = (Xmin <= X <= Xmax)

FogFactor = (FogEnd - Sz)/(FogEnd - FogStart)

Sc, Sz, X, Y

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