r500/regs/fg_fog_blend.txt

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Field Name Bits Default Description
ENABLE 0 0x0 Enable for fog blending
POSSIBLE VALUES:
00 - Disables fog (output matches input color).
01 - Enables fog.
FN 2:1 0x0 Fog generation function
POSSIBLE VALUES:
00 - Fog function is linear
01 - Fog function is exponential
02 - Fog function is exponential squared
03 - Fog is derived from constant fog factor