mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-07-15 04:28:56 +00:00
305 lines
3.6 KiB
ArmAsm
305 lines
3.6 KiB
ArmAsm
; Cavern scene (with the slugs)
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ootw_cavern:
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;===========================
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; Enable graphics
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bit LORES
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bit SET_GR
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bit FULLGR
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;===========================
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; Clear both bottoms
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lda #$4
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sta DRAW_PAGE
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jsr clear_bottom
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lda #$0
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sta DRAW_PAGE
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jsr clear_bottom
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lda #0
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sta DRAW_PAGE
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lda #1
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sta DISP_PAGE
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;=============================
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; Load background to $c00
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lda #$0c
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sta BASH
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lda #$00
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sta BASL ; load image off-screen $c00
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lda #>(cavern_rle)
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sta GBASH
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lda #<(cavern_rle)
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sta GBASL
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jsr load_rle_gr
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;=================================
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; copy to both pages $400/$800
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jsr gr_copy_to_current
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jsr page_flip
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jsr gr_copy_to_current
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;=================================
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; setup vars
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; lda #22
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; sta PHYSICIST_Y
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; lda #20
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; sta PHYSICIST_X
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; lda #1
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; sta DIRECTION
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lda #0
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sta GAIT
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sta GAME_OVER
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lda #30
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sta TENTACLE_PROGRESS
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;============================
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; Cavern Loop (not a palindrome)
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;============================
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cavern_loop:
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; check keyboard
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jsr handle_keypress_cavern
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;================================
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; copy background to current page
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jsr gr_copy_to_current
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;===============
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; draw physicist
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jsr draw_physicist
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;===============
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; draw slugs
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jsr draw_slugs
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;======================
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; draw falling boulders
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;=======================
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; page flip
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jsr page_flip
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;========================
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; inc frame count
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inc FRAMEL
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bne frame_no_oflo_c
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inc FRAMEH
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frame_no_oflo_c:
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; pause?
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; see if game over
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lda GAME_OVER
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cmp #$ff
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beq done_cavern
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; see if left level
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cmp #1
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bne still_in_cavern
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lda #37
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sta PHYSICIST_X
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jmp ootw_pool
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still_in_cavern:
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; loop forever
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jmp cavern_loop
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done_cavern:
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rts
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;======================================
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; handle keypress
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;======================================
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handle_keypress_cavern:
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lda KEYPRESS ; 4
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bpl no_keypress_c ; 3
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; -1
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and #$7f ; clear high bit
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check_quit_c:
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cmp #'Q'
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beq quit_c
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cmp #27
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bne check_left_c
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quit_c:
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lda #$ff
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sta GAME_OVER
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rts
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check_left_c:
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cmp #'A'
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beq left_c
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cmp #$8 ; left arrow
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bne check_right_c
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left_c:
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lda DIRECTION
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bne face_left_c
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dec PHYSICIST_X
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bpl just_fine_left_c
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too_far_left_c:
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lda #1
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sta GAME_OVER
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rts
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just_fine_left_c:
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inc GAIT
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inc GAIT
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jmp done_keypress_c
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face_left_c:
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lda #0
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sta DIRECTION
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sta GAIT
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jmp done_keypress_c
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check_right_c:
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cmp #'D'
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beq right_c
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cmp #$15
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bne unknown_c
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right_c:
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lda DIRECTION
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beq face_right_c
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inc PHYSICIST_X
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lda PHYSICIST_X
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cmp #37
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bne just_fine_right_c
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too_far_right_c:
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dec PHYSICIST_X
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just_fine_right_c:
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inc GAIT
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inc GAIT
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jmp done_keypress_c
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face_right_c:
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lda #0
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sta GAIT
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lda #1
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sta DIRECTION
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jmp done_keypress_c
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unknown_c:
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done_keypress_c:
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bit KEYRESET ; clear the keyboard strobe ; 4
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no_keypress_c:
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rts ; 6
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;==================================
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; draw slugs
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;==================================
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slugg0_out: .byte $1
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slugg0_x: .byte $01
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slugg0_dir: .byte $1
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slugg0_gait: .byte $0
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; ___ _-_
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draw_slugs:
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lda slugg0_out
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beq slug_done ; don't draw if not there
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inc slugg0_gait
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lda slugg0_gait
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and #$1f
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cmp #$00
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bne slug_no_move
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slug_move:
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lda slugg0_x
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clc
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adc slugg0_dir
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sta slugg0_x
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cmp #37
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beq remove_slug
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slug_no_move:
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lda slugg0_gait
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and #$10
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beq slug_squinched
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slug_flat:
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lda #<slug1
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sta INL
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lda #>slug1
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sta INH
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bne slug_selected
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slug_squinched:
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lda #<slug2
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sta INL
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lda #>slug2
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sta INH
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slug_selected:
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lda slugg0_x
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sta XPOS
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lda #34
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sta YPOS
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lda DIRECTION
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bmi slug_right
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slug_left:
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jsr put_sprite
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jmp slug_done
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slug_right:
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jsr put_sprite_flipped
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slug_done:
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rts
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remove_slug:
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lda #0
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sta slugg0_out
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rts
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