dos33fsprogs/ootw/ootw_c1_cavern.s

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; Cavern scenes (with the slugs)
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ootw_cavern:
;===========================
; Enable graphics
bit LORES
bit SET_GR
bit FULLGR
;==================
; setup drawing
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lda #0
sta DRAW_PAGE
lda #1
sta DISP_PAGE
;======================
; setup room boundaries
lda #(-4+128)
sta LEFT_LIMIT
lda #(39+128)
sta RIGHT_LIMIT
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;=============================
; Load background to $c00
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jsr cavern_load_background
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;================================
; Load quake background to $BC00
jsr gr_make_quake
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;================================
; setup per-cave variables
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lda WHICH_CAVE
bne cave1
cave0:
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; set slug table to use
lda #0
sta ds_smc1+1
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lda #(SLUG_STRUCT_SIZE*3)
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sta ds_smc2+1
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; set right exit
lda #1
sta cer_smc+1
lda #<ootw_cavern
sta cer_smc+5
lda #>ootw_cavern
sta cer_smc+6
; set left exit
lda #0
sta cel_smc+1
lda #<ootw_pool
sta cel_smc+5
lda #>ootw_pool
sta cel_smc+6
jmp cave_setup_done
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cave1:
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; set slug table to use
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lda #(SLUG_STRUCT_SIZE*3)
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sta ds_smc1+1
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lda #(SLUG_STRUCT_SIZE*7)
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sta ds_smc2+1
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; set right exit
lda #1
sta cer_smc+1
lda #<ootw_mesa
sta cer_smc+5
lda #>ootw_mesa
sta cer_smc+6
; set left exit
lda #0
sta cel_smc+1
lda #<ootw_cavern
sta cel_smc+5
lda #>ootw_cavern
sta cel_smc+6
cave_setup_done:
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;=================================
; copy $c00 background to both pages $400/$800
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jsr gr_copy_to_current
jsr page_flip
jsr gr_copy_to_current
;=================================
; setup vars
lda #0
sta GAIT
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sta GAME_OVER
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jsr setup_beast
;============================
;============================
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;============================
; Cavern Loop (not a palindrome)
;============================
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;============================
;============================
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cavern_loop:
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;==========================
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; handle earthquake
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jsr earthquake_handler
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;===============
; check keyboard
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jsr handle_keypress
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;===============
; move physicist
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jsr move_physicist
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;===============
; check room limits
jsr check_screen_limit
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;===============
; draw physicist
jsr draw_physicist
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;================
; handle beast
lda BEAST_OUT
beq cavern_no_beast
;================
; move beast
jsr move_beast
;================
; draw beast
jsr draw_beast
cavern_no_beast:
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just_slugs:
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;===============
; draw slugs
jsr draw_slugs
;======================
; draw falling boulders
jsr draw_boulder
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;=======================
; page flip
jsr page_flip
;========================
; inc frame count
inc FRAMEL
bne frame_no_oflo_c
inc FRAMEH
frame_no_oflo_c:
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;=================
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; see if game over
lda GAME_OVER
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beq still_in_cavern ; if 0, continue as per normal
cmp #$ff ; if $ff, we died
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beq done_cavern
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;===========================
; see if exited room to right
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cmp #1
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beq cavern_exit_left
cavern_exit_right:
lda #0
sta PHYSICIST_X
cer_smc:
lda #$0
sta WHICH_CAVE
jmp ootw_pool
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;==========================
; see if exited room to left
cavern_exit_left:
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lda #37
sta PHYSICIST_X
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cel_smc:
lda #$0
sta WHICH_CAVE
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jmp ootw_pool
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still_in_cavern:
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; loop forever
jmp cavern_loop
done_cavern:
rts
;===============================
; load proper background to $c00
;===============================
cavern_load_background:
lda WHICH_CAVE
bne cave_bg1
cave_bg0:
; load background
lda #>(cavern_rle)
sta GBASH
lda #<(cavern_rle)
sta GBASL
jmp cave_bg_done
cave_bg1:
; load background
lda #>(cavern2_rle)
sta GBASH
lda #<(cavern2_rle)
sta GBASL
cave_bg_done:
lda #$c ; load image off-screen $c00
jmp load_rle_gr ; tail call