[BUG]: FOG Inaccuracy

[F0bes]

[TellowKrinkle]

Our SW renderer currently does the equivalent of (Color * Fog + FogColor * (0x100 - Fog) + 0x80) >> 8. The GS appears to be doing (Color * Fog + FogColor * (0x100 - Fog)) >> 8

Additional GS Test Results

VERT	FOGCOL	FOG	Output
0	128	0	128
0	255	0	255
255	0	0	0
0	128	128	64
0	255	128	127
255	0	128	127
0	128	255	0
0	255	255	0
255	0	255	254
0	128	1	127
0	255	1	254
255	0	1	0
0	128	129	63
0	255	129	126
255	0	129	128
0	127	121	66
255	127	121	187
129	0	121	60
0	127	128	63
255	127	128	191
129	0	128	64
0	127	129	63
255	127	129	191
129	0	129	65
0	127	127	63
255	127	127	190
129	0	127	63
128	0	255	127
128	127	255	127
128	128	255	128