Color Special Effects; Selection Of Color Special Effects - Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual

AGB Programming Manual

9 Color Special Effects

The AGB provides the following color special effects. The area where these effects are applied
can be limited using a window.
1) Blending
Performs arithmetic operations on 2 selected surfaces and implements processing for
16 levels of semi-transparency.
2) Fade-in/Fade-out
Performs arithmetic operations on 1 selected surface and implements processing
for 16 levels of brightness.

9.1 Selection of Color Special Effects

The types of color special effects and the target pixels, are determined by the
BLDCNT register.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Address Register
050h BLDCNT
Although color special effects are specified by the BLDCNT register, for
which involves processing between surfaces, the 2 target surfaces must have suitable
priorities.
©1999 - 2001 Nintendo of America Inc.
BD OBJ BG3BG2 BG1 BG0
2nd Target Pixel
BD OBJ BG3 BG2 BG1BG0
1st Target Pixel
Color Special Effects Setting
80
Color Special Effects
Attributes Initial Value
R/W 0000h
blending,
D.C.N. AGB-06-0001-002B4