Wall Jump in Sonic 1

Your jump is a tad strong under water. Might want to add a check for that.

I'm also curious to see what it would feel like if you didn't let go of the wall after a while.
I'll have to try that later...

 

By the way, for anyone who wants to use the original Knuckles Chaotix control scheme (hold jump button instead of direction pad), first go to Sonic_JumpHeight and change and add as such:

Code (Text):

1. Sonic_JumpHeight:        ; XREF: Obj01_MdJump; Obj01_MdJump2
2.     ;Mercury Wall Jump        tst.b    $2C(a0); on wall?
3.         beq.s    JmpToWJskip
4.         move.b    ($FFFFF602).w,d0; get jpad
5.         and.b    $2D(a0),d0; compare jpad to stored L,R button states
6.         beq.s    WJAnyway    ; if still held, branch
7.         move.b    ($FFFFF602).w,d0
8.         andi.b    #$70,d0
9.         bne.s    JmpToWJskip; if yes, branch
10.         tst.b    ($FFFFFFA8).w    ; was jumpdash flag set?        
11.         bne.w    WJAnyway        ; if yes, branch
12.         move.b    #1,($FFFFFFA8).w; if not, set jumpdash flag
13. WJAnyway:
14.         move.w    #0,$2C(a0); clear Wall Jump data
15.         move.b    #1,$3C(a0)
16.         move.b    #2,$1C(a0); use "jumping" animation
17.         btst    #6,$22(a0)    ; is player underwater?
18.         beq.s    WJNotUnderwater    ; if not, branch
19.         move.w    #-$400,d0
20.         btst    #0,($FFFFF602).w
21.         bne.s    JmpToWJuponly
22.         move.w    #-$300,d0
23.         move.w    #-$500,$10(a0)
24.          jmp    WJ_Animate
25. JmpToWJskip:
26.         jmp    WJskip
27. JmpToWJuponly:
28.         jmp    WJuponly
29. WJNotUnderwater:
30.         move.w    #-$600,d0
31.         btst    #0,($FFFFF602).w
32.         bne.s    WJuponly
33.         move.w    #-$400,d0
34.         move.w    #-$700,$10(a0)
35. WJ_Animate:
36.         btst    #0,$22(a0)
37.         beq.s    WJuponly
38.         neg.w    $10(a0)
39.         
40. WJuponly:
41.         move.w    d0,$12(a0)
42.         move.w    #$A0,d0
43.         jsr    (PlaySound_Special).l;    play jumping sound
44.         
45. WJskip:
46.     ;end Wall Jump
47.         tst.b    $3C(a0)
48.         beq.s    loc_134C4
49.         move.w    #-$400,d1
50.         btst    #6,$22(a0)
51.         beq.s    loc_134AE
52.         move.w    #-$200,d1
53.  
54. loc_134AE:
55.         cmp.w    $12(a0),d1
56.         ble.s    locret_134C2
57.         cmp.b     #1,($FFFFFFA8).w; check if bit 2 of the Air Attack flag is set
58.         beq.s    locret_134C2; if yes, branch
59.         move.b    ($FFFFF602).w,d0
60.         andi.b    #$70,d0    ; is A,    B or C pressed?
61.         bne.s    locret_134C2; if yes, branch
62.         move.w    d1,$12(a0)
63. locret_134C2:
64.         rts...

Then go to WallJump and change:

Code (Text):

1.         move.b    ($FFFFF602).w,d0; get jpad
2.         andi.b    #$C,d0; keep just L and R state
3.         beq.s    @return; fail if neither are pressed
4.         cmpi.b    #$C,d0; fail if both are pressed
5.         beq.s    @return

into:

Code (Text):

1.         move.b    ($FFFFF602).w,d0; get jpad
2.         andi.b    #$70,d0; keep just L and R state
3.         beq.s    @return        ; fail if neither are pressed
4.         move.b    ($FFFFF602).w,d0; get jpad
5.         andi.b    #$C,d0; keep just L and R state
6.         beq.s    @return        ; fail if neither are pressed
7.         cmpi.b    #$C,d0; fail if both are pressed
8.         beq.s    @return

Then add the obvious clr flag for ($FFFFFFA8) in Sonic_ResetOnFloor.

This is for the Hivebrain assembly though it shouldn't be too hard to convert. Special thanx to Aquaslash and Fragag.

 

I'm having an odd issue with this, with the GHZ Solid Wall, it's sticking to some of the wall, but not all...mostly not when I go for one from the right...

 

Not all walls can be clung onto sadly, similar to Knuckles' climb move. It seems certain surfaces don't interact the same.

 

But some of the solid walls can, and Mercury said the obj44 Wall was clingable

 

If I were to guess, it would be that the wall in question is not terrain-based but sprite-based.

 

Sounds about right, as it's the GHZ wall, Obj 44 as previously mentioned. Anyways, funny thing is it's only some of the walls. Here's one little area of trouble:

Green Arrow is where it works, Red are where it does not.
On the right wall, the green arrow (2 GHZ walls) and the red one, are the EXACT same type of GHZ wall o.O So I don't see the issue there...and the whole wall I've put the left side there doesn't activate walljump (despite being the exact type of wall again). I've tried all Obj44 types that side (grass shadow, no shadow, full shadow) and have tried normal, flip, mirror, everything. But none of them worked, oddly. Any recommendations?

 

It's a custom area I put there, and all of the wall objects are solid when not wall jumping, and were all placed there in SonED2