;------------------------------------------------------------------------------
; Fog calculation
;------------------------------------------------------------------------------

; Calculate fog factor and copy to fog register
add r7, c51, -r11 dp3 r4.x, r7, r7 rsq r4.x, r4.x rcp r4.x, r4.x mad r4.x, r4.x, c4.x, c4.y dp4 r4.y, r11, c52 mad r4.y, r4.y, c4.z, c4.w min oFog, r4.x, r4.y