Nintendo 1504166 Programming Manual - Page 80
Color Special Effects, 9.1 Selection of Color Special Effects, Blending, Fade-in/Fade-out
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AGB Programming Manual Color Special Effects 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) α 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. Address Register 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Attributes Initial Value 050h BLDCNT BD OBJ BG3BG2 BG1 BG0 BD OBJ BG3 BG2 BG1BG0 R/W 0000h 2nd Target Pixel 1st Target Pixel Color Special Effects Setting Although color special effects are specified by the BLDCNT register, for α blending, which involves processing between surfaces, the 2 target surfaces must have suitable priorities. ©1999 - 2001 Nintendo of America Inc. 80 D.C.N. AGB-06-0001-002B4