8.9.2.2
DRWCONTROL2 - Surface control register
This register controls the colourization and blending units, deciding what colour
a pixel should have.
Access
This register can be written in 32-bit units.
Address
<DrwE_Base> + 04
H
Index
1
Initial Value
0000 0000
H
. This register is initialized by any reset.
31
30
29
28
27
26
25
24
0
0
0
0
0
0
0
0
W
W
W
W
W
W
W
W
23
22
21
20
19
18
17
16
WRITEALPHA
WRITEFORMAT
READFORMAT
TEXTURE
FILTERY
TEXTURE
FILTERX
W
W
W
W
W
W
W
W
15
14
13
12
11
10
9
8
TEXTURE
CLAMPY
TEXTURE
CLAMPX
BC2
BDI
BSI
BDF
BSF
0
W
W
W
W
W
W
W
W
7
6
5
4
3
2
1
0
0
0
0
READ
FORMAT
3
0
PATTERN
SOURCE
L5
TEXTURE
ENABLE
PATTERN
ENABLE
W
W
W
W
W
W
W
W
Wrting to bits marked with "0" is ignored.
Bit
Bit name
Function
23 to 22
WRITEALPHA
Set the 'alpha source' for the framebuffer.
00
B
use alpha from colour 2
01
B
use source alpha (pixel coverage)
00
B
use 0.0 as alpha
11
B
use alpha from framebuffer
21 to 20 WRITEFORMAT
Pixel format of the framebuffer
00
B
8 bpp a(8)
01
B
16 bpp RGB(565)
10
B
32 bpp RGB(8888)
11
B
16 bpp aRGB(4444)
4, 19 to
18
READFORMAT
Pixel format of the texture buffer
000
B
8 bpp a(8)
Chapter 8
Drawing Engine
258
Preliminary User's Manual S19203EE1V3UM00
Содержание uPD72257
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