MB86293 Datasheet, PDF (87/285 Pages) Fujitsu Component Limited. – Grraphiics Conttrrollllerr Speciiffiicattiions

FUJITSU LIMITED
PRELIMINARY and CONFIDENTIAL
8.5.3 Logic operation
This mode executes a logic operation between the pixel to be drawn and the one already drawn in frame
buffer and its result is drawn. Alpha blending cannot be used when this function is specified.
Type
CLEAR
COPY
NOP
SET
COPY INVERTED
INVERT
AND REVERSE
OR REVERSE
ID
0000
0011
0101
1111
1100
1010
0010
1011
Operation
0
S
D
1
!S
!D
S & !D
S | !D
8.5.4 Hidden plane management
Type
AND
OR
NAND
NOR
XOR
EQUIV
AND INVERTED
OR INVERTED
ID
0001
0111
1110
1000
0110
1001
0100
1101
Operation
S&D
S|D
! (S & D)
! (S | D)
S xor D
! (S xor D)
!S & D
!S | D
CORAL supports the Z buffer for hidden plane management.
This function compares the Z value of a new pixel to be drawn and the existing Z value in the Z buffer.
Display/not display is switched according to the Z-compare mode setting. Define the Z-buffer access
options in the ZWRITEMASK mode.
The Z compare operation type is determined by the Z compare mode.
Either 16 or 8 bits can be selected for the Z-value.
ZWRITEMASK
1
Compare Z values, no Z value write overwrite
0
Compare Z values, Z value write
Z Compare mode
NEVER
ALWAYS
LESS
LEQUAL
EQUAL
GEQUAL
GREATER
NOTEQUAL
Code
000
001
010
011
100
101
110
111
Condition
Never draw
Always draw
Draw if pixel Z value < current Z buffer value
Draw if pixel Z value ≤ current Z buffer value
Draw if pixel Z value = current Z buffer value
Draw if pixel Z value ≥ current Z buffer value
Draw if pixel Z value > current Z buffer value
Draw if pixel Z value ! = current Z buffer value
MB86293 CORAL_LQ
Graphics Controller
87
Specifications Rev. 1.1