MB86296 Datasheet, PDF (295/352 Pages) Fujitsu Component Limited. – PCI Graphics Controller Specification

FUJITSU LIMITED PRELIMINARY AND CONFIDENTIAL
13.2.8 Triangle drawing registers
Each register is used by the drawing commands. The registers cannot be accessed from the CPU or
using the SetRegister command.
(XY coordinates register)
Register Address 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Ys 0000H S S S S
Int
Frac
Xs 0004H S S S S
Int
Frac
dXdy 0008H S S S S
Int
Frac
XUs 000cH S S S S
Int
Frac
dXUdy 0010H S S S S
Int
Frac
XLs 0014H S S S S
Int
Frac
dXLdy 0018H S S S S
Int
Frac
USN 001bH 0 0 0 0
Int
0
LSN 0020H 0 0 0 0
Int
0
Address
S
0
Int
Frac
Offset value from DrawBaseAddress
Sign bit or sign extension
Not used or 0 extension
Integer or integer part of fixed point data
Fraction part of fixed point data
Sets (X, Y) coordinates for triangle drawing
Ys
Xs
dXdy
XUs
dXUdy
XLs
dXLdy
USN
LSN
Y coordinates start position of long edge
X coordinates start position of long edge corresponding to Ys
X DDA value of long edge direction
X coordinates start position of upper edge
X DDA value of upper edge direction
X coordinates start position of lower edge
X DDA value of lower edge direction
Count of spans of upper triangle. If this value is “0”, theupper triangle is not drawn.
Count of spans of lower triangle. If this value is “0”, the lower triangle is not drawn.
MB86296S <Coral-PA>
285
Specification Manual Rev0.1