mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-10 13:29:57 +00:00
25 lines
518 B
ArmAsm
25 lines
518 B
ArmAsm
;====================
|
|
; lookup_map
|
|
;====================
|
|
; finds value in space_x.i,space_y.i
|
|
; returns color in A
|
|
; CLOBBERS: A,Y
|
|
|
|
lda SPACEX_I ; 3
|
|
sta spacex_label+1 ; self modifying code, LAST_SPACEX_I ; 4
|
|
|
|
lda SPACEY_I ; 3
|
|
sta spacey_label+1 ; self modifying code, LAST_SPACEY_I ; 4
|
|
|
|
lda SPACEX_I
|
|
and #$f
|
|
sta TEMP
|
|
asl
|
|
asl
|
|
asl
|
|
asl
|
|
ora TEMP
|
|
eor SPACEY_I
|
|
|
|
sta map_color_label+1 ; self-modifying
|