mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-28 14:29:42 +00:00
266 lines
3.7 KiB
ArmAsm
266 lines
3.7 KiB
ArmAsm
; draw/move our friend
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friend_out: .byte 0
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friend_x: .byte 0
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friend_y: .byte 0
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friend_state: .byte 0
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friend_gait: .byte 0
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friend_direction: .byte 0
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friend_gun: .byte 0
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F_STANDING = 0
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F_WALKING = 1
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F_RUNNING = 2
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F_CROUCHING = 3
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F_TURNING = 4
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;=======================================
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; Move friend based on current state
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;
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move_friend:
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lda friend_state
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beq done_move_friend
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lda friend_state
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cmp #F_WALKING
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beq move_friend_walking
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cmp #F_RUNNING
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beq move_friend_running
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done_move_friend:
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rts
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;======================
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; walking
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move_friend_walking:
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inc friend_gait ; cycle through animation
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lda friend_gait
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and #$f
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cmp #$8 ; only walk roughly 1/8 of time
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bne friend_no_move_walk
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lda friend_direction
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beq f_walk_left
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inc friend_x ; walk right
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rts
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f_walk_left:
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dec friend_x ; walk left
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friend_no_move_walk:
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rts
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;======================
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; running
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move_friend_running:
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inc friend_gait ; cycle through animation
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lda friend_gait
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and #$3
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cmp #$2 ; only run roughly 1/4 of time
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bne friend_no_move_run
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lda friend_direction
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beq f_run_left
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inc friend_x ; run right
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rts
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f_run_left:
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dec friend_x ; run left
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friend_no_move_run:
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rts
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;======================
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; standing
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move_friend_standing:
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fstate_table_lo:
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.byte <friend_standing ; 00
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.byte <friend_walking ; 01
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.byte <friend_running ; 02
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.byte <friend_crouching ; 03
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.byte <friend_turning ; 04
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fstate_table_hi:
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.byte >friend_standing ; 00
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.byte >friend_walking ; 01
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.byte >friend_running ; 02
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.byte >friend_crouching ; 03
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.byte >friend_turning ; 04
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; Urgh, make sure this doesn't end up at $FF or you hit the
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; NMOS 6502 bug
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.align 2
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fjump:
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.word $0000
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.align 1
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;======================================
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; draw friend
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;======================================
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draw_friend:
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lda friend_out
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beq no_friend
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lda friend_state
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tay
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lda fstate_table_lo,y
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sta fjump
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lda fstate_table_hi,y
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sta fjump+1
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jmp (fjump)
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no_friend:
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rts
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;==================================
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; STANDING
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;==================================
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friend_standing:
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lda #<friend_stand
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sta INL
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lda #>friend_stand
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sta INH
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jmp finally_draw_friend
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;===================================
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; CROUCHING
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;===================================
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friend_crouching:
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; FIXME: we have an animation?
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lda #<friend_crouch2
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sta INL
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lda #>friend_crouch2
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sta INH
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jmp finally_draw_friend
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;===============================
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; Walking
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;================================
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friend_walking:
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lda friend_gait
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cmp #64
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bcc friend_gait_fine ; blt
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lda #0
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sta friend_gait
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friend_gait_fine:
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lsr
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lsr
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and #$fe
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tay
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lda friend_walk_progression,Y
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sta INL
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lda friend_walk_progression+1,Y
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sta INH
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jmp finally_draw_friend
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;===============================
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; Running
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;================================
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friend_running:
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lda friend_gait
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cmp #32
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bcc friend_run_gait_fine ; blt
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lda #0
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sta friend_gait
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friend_run_gait_fine:
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lsr
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and #$fe
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tay
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lda friend_run_progression,Y
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sta INL
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lda friend_run_progression+1,Y
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sta INH
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jmp finally_draw_friend
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;===============================
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; Turning
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;================================
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friend_turning:
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dec friend_gait
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bpl friend_draw_turning
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lda #0
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sta friend_gait
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; switch direction
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lda friend_direction
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eor #$1
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sta friend_direction
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lda #F_WALKING
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sta friend_state
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friend_draw_turning:
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lda #<friend_turning_sprite
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sta INL
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lda #>friend_turning_sprite
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sta INH
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jmp finally_draw_friend
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;=============================
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; Actually Draw Alien
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;=============================
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finally_draw_friend:
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lda friend_x
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sta XPOS
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lda friend_y
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sta YPOS
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lda friend_direction
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bne friend_facing_right
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friend_facing_left:
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jmp put_sprite_crop
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friend_facing_right:
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jmp put_sprite_flipped_crop
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