diff options
| author | B. Watson <urchlay@slackware.uk> | 2022-11-08 01:31:41 -0500 |
|---|---|---|
| committer | B. Watson <urchlay@slackware.uk> | 2022-11-08 01:31:41 -0500 |
| commit | af122e258fe45d5081213dc1ac55f782c3dd8b9f (patch) | |
| tree | 351b140fda05bd1b8298d319a304e6225288718e | |
| parent | 57587d7d306f5a4ca3597f44b584ce9ad2886866 (diff) | |
| download | dla-asm-af122e258fe45d5081213dc1ac55f782c3dd8b9f.tar.gz | |
Optimize the new drunkwalk...
| -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 |