RochesterX/nes
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Movement refactor

Browse Source
This commit is contained in:
Trevor Maze
2026-02-18 16:56:16 -05:00
parent 7a8fb73f84
commit a59424b3ef
2 changed files with 38 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

BIN
plat.nes
View File

Binary file not shown.

67
plat.s
View File

@@ -333,6 +333,7 @@ jump_pressed_last_frame: .res 1
frame_counter: .res 1 frame_counter: .res 1
last_frame_jumped: .res 1 last_frame_jumped: .res 1
last_frame_moving: .res 1
.segment "CODE" .segment "CODE"
main: main:
@@ -514,6 +515,9 @@ movement:
lda player_status lda player_status
and #%11111110 and #%11111110
sta player_status sta player_status
lda frame_counter
sta last_frame_moving
: :
jsr btn_left jsr btn_left
@@ -521,31 +525,41 @@ movement:
beq :+ beq :+
ldx #1 ldx #1
lda horizontal_speed lda horizontal_speed
ora #%10000000 eor #%11111111
clc
adc #1
sta player_vel_x sta player_vel_x
lda player_status lda player_status
ora #%00000001 ora #%00000001
sta player_status sta player_status
lda frame_counter
sta last_frame_moving
: :
cpx #1 cpx #1 ; skip decay if right or left pressed
beq @end beq @end
lda frame_counter lda frame_counter
and #1 clc
sbc last_frame_moving
and #3
cmp #0 cmp #0
bne @end bne @end
lda #0 lda player_vel_x
cmp player_vel_x and #%01111111
cmp #0
beq @end ; If player_vel_x = 0, skip decay beq @end ; If player_vel_x = 0, skip decay
; If player_vel_x > 0, decrement lda player_vel_x
bpl :+ and #%10000000
; If player_vel_x positive, decrement
bne :+
lda player_vel_x lda player_vel_x
sec sec
sbc #16 sbc #16
stx player_vel_x sta player_vel_x
jmp @end jmp @end
: :
; Else if player_vel_x < 0, increment ; Else if player_vel_x < 0, increment
@@ -603,7 +617,7 @@ movement:
bne :+ bne :+
; 0: right ; 0: right
lda player_vel_x lda player_vel_x
and #%01110000 and #%01111111
clc clc
ror ror
clc clc
@@ -612,7 +626,9 @@ movement:
ror ror
clc clc
ror ror
sta var_n ; pixels clc
adc player_pos_x
sta player_pos_x ; add pixels
lda player_vel_x lda player_vel_x
and #%00001111 and #%00001111
@@ -633,19 +649,19 @@ movement:
: :
; 1: left ; 1: left
lda player_vel_x lda player_vel_x
and #%01110000 sec
clc ror
sec
ror
sec
ror
sec
ror ror
clc clc
ror ora #%10000000
clc adc player_pos_x
ror sta player_pos_x ; add pixels
clc
ror
eor #%11111111
clc
adc #1
sta var_n ; pixels
lda player_vel_x lda player_vel_x
and #%00001111 and #%00001111
@@ -662,17 +678,10 @@ movement:
bmi @end_sub_subpos ; so skip if subpos is bigger than result bmi @end_sub_subpos ; so skip if subpos is bigger than result
ldx player_pos_x ldx player_pos_x
dex dex
stx player_pos_x ;stx player_pos_x
@end_sub_subpos: @end_sub_subpos:
: :
lda player_pos_x
clc
adc var_n ; add pixels
sta player_pos_x
; load x pos, filter blocks, check up and down ; load x pos, filter blocks, check up and down