diff options
| -rw-r--r-- | drunkwalk.s | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drunkwalk.s b/drunkwalk.s index ca80475..6156e4a 100644 --- a/drunkwalk.s +++ b/drunkwalk.s @@ -13,12 +13,12 @@ drunkwalk: ldy part_x ; 3 ldx part_y ; 3 - ; do we need this now? lda lineaddrs_l,x ; 5 sta pixptr ; 3 lda lineaddrs_h,x ; 5 sta pixptr+1 ; 3 +move_pixel: bit RANDOM ; 4 ; use top 2 bits (probably more random, definitely faster) bmi lr ; 2/3 bvc down ; 2/3 @@ -79,9 +79,14 @@ check_ud: sta pixptr2+1 lda (pixptr2),y bne stick - jmp drunkwalk + jmp move_pixel check_lru: + lda lineaddrs_l,x ; 5 + sta pixptr ; 3 + lda lineaddrs_h,x ; 5 + sta pixptr+1 ; 3 + ; check left neighbor dey lda (pixptr),y @@ -99,9 +104,14 @@ check_lru: sta pixptr2+1 lda (pixptr2),y bne stick - jmp drunkwalk + jmp move_pixel check_lrd: + lda lineaddrs_l,x ; 5 + sta pixptr ; 3 + lda lineaddrs_h,x ; 5 + sta pixptr+1 ; 3 + ; check left neighbor dey lda (pixptr),y @@ -119,7 +129,7 @@ check_lrd: sta pixptr2+1 lda (pixptr2),y bne stick - jmp drunkwalk + jmp move_pixel stick: rts |