mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-20 03:35:24 +00:00
305 lines
3.6 KiB
ArmAsm
305 lines
3.6 KiB
ArmAsm
; Cavern scene (with the slugs)
|
|
|
|
|
|
|
|
ootw_cavern:
|
|
;===========================
|
|
; Enable graphics
|
|
|
|
bit LORES
|
|
bit SET_GR
|
|
bit FULLGR
|
|
|
|
|
|
|
|
;===========================
|
|
; Clear both bottoms
|
|
|
|
lda #$4
|
|
sta DRAW_PAGE
|
|
jsr clear_bottom
|
|
|
|
lda #$0
|
|
sta DRAW_PAGE
|
|
jsr clear_bottom
|
|
|
|
lda #0
|
|
sta DRAW_PAGE
|
|
lda #1
|
|
sta DISP_PAGE
|
|
|
|
|
|
;=============================
|
|
; Load background to $c00
|
|
|
|
lda #$0c
|
|
sta BASH
|
|
lda #$00
|
|
sta BASL ; load image off-screen $c00
|
|
|
|
lda #>(cavern_rle)
|
|
sta GBASH
|
|
lda #<(cavern_rle)
|
|
sta GBASL
|
|
jsr load_rle_gr
|
|
|
|
;=================================
|
|
; copy to both pages $400/$800
|
|
|
|
jsr gr_copy_to_current
|
|
jsr page_flip
|
|
jsr gr_copy_to_current
|
|
|
|
|
|
;=================================
|
|
; setup vars
|
|
; lda #22
|
|
; sta PHYSICIST_Y
|
|
; lda #20
|
|
; sta PHYSICIST_X
|
|
|
|
; lda #1
|
|
; sta DIRECTION
|
|
|
|
lda #0
|
|
sta GAIT
|
|
sta GAME_OVER
|
|
|
|
lda #30
|
|
sta TENTACLE_PROGRESS
|
|
|
|
;============================
|
|
; Cavern Loop (not a palindrome)
|
|
;============================
|
|
cavern_loop:
|
|
|
|
; check keyboard
|
|
|
|
jsr handle_keypress_cavern
|
|
|
|
;================================
|
|
; copy background to current page
|
|
|
|
jsr gr_copy_to_current
|
|
|
|
|
|
;===============
|
|
; draw physicist
|
|
|
|
jsr draw_physicist
|
|
|
|
;===============
|
|
; draw slugs
|
|
|
|
jsr draw_slugs
|
|
|
|
;======================
|
|
; draw falling boulders
|
|
|
|
|
|
;=======================
|
|
; page flip
|
|
|
|
jsr page_flip
|
|
|
|
;========================
|
|
; inc frame count
|
|
|
|
inc FRAMEL
|
|
bne frame_no_oflo_c
|
|
inc FRAMEH
|
|
|
|
frame_no_oflo_c:
|
|
|
|
; pause?
|
|
|
|
; see if game over
|
|
lda GAME_OVER
|
|
cmp #$ff
|
|
beq done_cavern
|
|
|
|
; see if left level
|
|
cmp #1
|
|
bne still_in_cavern
|
|
|
|
lda #37
|
|
sta PHYSICIST_X
|
|
jmp ootw_pool
|
|
|
|
still_in_cavern:
|
|
; loop forever
|
|
|
|
jmp cavern_loop
|
|
|
|
done_cavern:
|
|
rts
|
|
|
|
|
|
;======================================
|
|
; handle keypress
|
|
;======================================
|
|
|
|
handle_keypress_cavern:
|
|
|
|
lda KEYPRESS ; 4
|
|
bpl no_keypress_c ; 3
|
|
|
|
; -1
|
|
|
|
and #$7f ; clear high bit
|
|
|
|
check_quit_c:
|
|
cmp #'Q'
|
|
beq quit_c
|
|
cmp #27
|
|
bne check_left_c
|
|
quit_c:
|
|
lda #$ff
|
|
sta GAME_OVER
|
|
rts
|
|
|
|
check_left_c:
|
|
cmp #'A'
|
|
beq left_c
|
|
cmp #$8 ; left arrow
|
|
bne check_right_c
|
|
left_c:
|
|
lda DIRECTION
|
|
bne face_left_c
|
|
|
|
dec PHYSICIST_X
|
|
bpl just_fine_left_c
|
|
too_far_left_c:
|
|
|
|
lda #1
|
|
sta GAME_OVER
|
|
rts
|
|
|
|
just_fine_left_c:
|
|
|
|
inc GAIT
|
|
inc GAIT
|
|
|
|
jmp done_keypress_c
|
|
|
|
face_left_c:
|
|
lda #0
|
|
sta DIRECTION
|
|
sta GAIT
|
|
jmp done_keypress_c
|
|
|
|
check_right_c:
|
|
cmp #'D'
|
|
beq right_c
|
|
cmp #$15
|
|
bne unknown_c
|
|
right_c:
|
|
lda DIRECTION
|
|
beq face_right_c
|
|
|
|
inc PHYSICIST_X
|
|
lda PHYSICIST_X
|
|
cmp #37
|
|
bne just_fine_right_c
|
|
too_far_right_c:
|
|
dec PHYSICIST_X
|
|
just_fine_right_c:
|
|
|
|
|
|
inc GAIT
|
|
inc GAIT
|
|
jmp done_keypress_c
|
|
|
|
face_right_c:
|
|
lda #0
|
|
sta GAIT
|
|
lda #1
|
|
sta DIRECTION
|
|
jmp done_keypress_c
|
|
|
|
unknown_c:
|
|
done_keypress_c:
|
|
bit KEYRESET ; clear the keyboard strobe ; 4
|
|
|
|
|
|
no_keypress_c:
|
|
rts ; 6
|
|
|
|
|
|
;==================================
|
|
; draw slugs
|
|
;==================================
|
|
|
|
slugg0_out: .byte $1
|
|
slugg0_x: .byte $01
|
|
slugg0_dir: .byte $1
|
|
slugg0_gait: .byte $0
|
|
|
|
; ___ _-_
|
|
|
|
draw_slugs:
|
|
|
|
lda slugg0_out
|
|
beq slug_done ; don't draw if not there
|
|
|
|
inc slugg0_gait
|
|
|
|
lda slugg0_gait
|
|
and #$1f
|
|
cmp #$00
|
|
bne slug_no_move
|
|
|
|
slug_move:
|
|
lda slugg0_x
|
|
clc
|
|
adc slugg0_dir
|
|
sta slugg0_x
|
|
|
|
cmp #37
|
|
beq remove_slug
|
|
|
|
slug_no_move:
|
|
|
|
lda slugg0_gait
|
|
and #$10
|
|
beq slug_squinched
|
|
|
|
slug_flat:
|
|
lda #<slug1
|
|
sta INL
|
|
lda #>slug1
|
|
sta INH
|
|
bne slug_selected
|
|
|
|
slug_squinched:
|
|
lda #<slug2
|
|
sta INL
|
|
lda #>slug2
|
|
sta INH
|
|
|
|
slug_selected:
|
|
|
|
|
|
lda slugg0_x
|
|
sta XPOS
|
|
lda #34
|
|
sta YPOS
|
|
|
|
lda DIRECTION
|
|
bmi slug_right
|
|
|
|
slug_left:
|
|
jsr put_sprite
|
|
jmp slug_done
|
|
|
|
slug_right:
|
|
jsr put_sprite_flipped
|
|
|
|
slug_done:
|
|
rts
|
|
|
|
remove_slug:
|
|
lda #0
|
|
sta slugg0_out
|
|
rts
|