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johngirvin/68k_aabb_2cmp.s

Last active April 17, 2024 19:43
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68k_aabb_2cmp.s
; 68000 2xCMP AABB check between box A and B
;
; d0=ax1,ay1 coordinates of top-left of A
; d3=bx2,by2 coordinates of bottom-right of B
; d5=-(aw+bw) -(A width + B width)
; d6=-(ah+bh) -(A height + B height)
sub.w d3,d0 ;d0=ay1-by2
cmp.w d6,d0 ;cmp #-(ah+bh)
bls .cd_done1 ;Skip if Y out of range
swap d0 ;Get ax1-bx2 in d0
swap d3
sub.w d3,d0
cmp.w d5,d0 ;cmp #-(aw+bw)
bls .cd_done0 ;Skip if X out of range
; Handle Collision
...
.cd_done0:
swap d3 ;restore d3=bx2,by2
.cd_done1:
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