dos33fsprogs/mist/mist.s
2020-03-26 14:17:10 -04:00

288 lines
4.0 KiB
ArmAsm

; Mist
; a version of Myst?
; (yes there's a subtle German joke here)
; by deater (Vince Weaver) <vince@deater.net>
; Zero Page
.include "zp.inc"
.include "hardware.inc"
.include "common_defines.inc"
mist_start:
;===================
; init screen
jsr TEXT
jsr HOME
bit KEYRESET
bit SET_GR
bit PAGE0
bit LORES
bit FULLGR
lda #0
sta DRAW_PAGE
sta LEVEL_OVER
; init cursor
lda #20
sta CURSOR_X
sta CURSOR_Y
; set up initial location
jsr change_location
lda #1
sta CURSOR_VISIBLE ; visible at first
; init the clock bridge
jsr raise_bridge
; init the gear
jsr open_the_gear
game_loop:
;=================
; reset things
;=================
lda #0
sta IN_SPECIAL
sta IN_RIGHT
sta IN_LEFT
;====================================
; copy background to current page
;====================================
jsr gr_copy_to_current
;====================================
; handle special-case forground logic
;====================================
; handle gear opening
lda GEAR_OPEN
beq not_gear_related
jsr check_gear_delete
not_gear_related:
; handle clock puzzles
lda LOCATION
cmp #MIST_CLOCK_PUZZLE ; clock puzzle
beq location_clock
cmp #MIST_CLOCK_INSIDE
beq location_inside_clock
bne location_generator
location_clock:
jsr draw_clock_face
jmp nothing_special
location_inside_clock:
jsr draw_clock_inside
jmp nothing_special
; handle generator puzzle
location_generator:
cmp #MIST_GENERATOR_ROOM
bne nothing_special
lda DIRECTION
and #$f
cmp #DIRECTION_N
bne nothing_special
jsr generator_update_volts
jsr generator_draw_buttons
jmp nothing_special
nothing_special:
;====================================
; draw pointer
;====================================
jsr draw_pointer
;====================================
; page flip
;====================================
jsr page_flip
;====================================
; handle keypress/joystick
;====================================
jsr handle_keypress
;====================================
; inc frame count
;====================================
inc FRAMEL
bne room_frame_no_oflo
inc FRAMEH
room_frame_no_oflo:
;====================================
; check level over
;====================================
lda LEVEL_OVER
bne really_exit
jmp game_loop
really_exit:
jmp end_level
;=================
; special exits
go_to_meche:
lda #LOAD_MECHE
sta WHICH_LOAD
lda #MECHE_INSIDE_GEAR
sta LOCATION
lda #DIRECTION_E
sta DIRECTION
jmp set_level_over
pad_special:
lda #MIST_TOWER2_PATH
sta LOCATION
jsr change_location
rts
leave_tower2:
lda #MIST_TOWER2_TOP
sta LOCATION
lda #DIRECTION_W
sta DIRECTION
jsr change_location
rts
leave_tower1:
lda #MIST_TOWER1_TOP
sta LOCATION
lda #DIRECTION_E
sta DIRECTION
jsr change_location
rts
green_house:
; FIXME: handle switch separately
lda #MIST_GREEN_SHACK
sta LOCATION
jsr change_location
rts
enter_octagon:
lda #OCTAGON_TEMPLE_DOORWAY
sta LOCATION
lda #LOAD_OCTAGON
sta WHICH_LOAD
jmp set_level_over
enter_viewer:
lda #VIEWER_STEPS
sta LOCATION
lda #LOAD_VIEWER
sta WHICH_LOAD
jmp set_level_over
enter_stoneyship:
lda #STONEY_SHIP_STERN
sta LOCATION
lda #DIRECTION_N
sta DIRECTION
lda #LOAD_STONEY
sta WHICH_LOAD
set_level_over:
lda #$ff
sta LEVEL_OVER
rts
;==========================
; includes
;==========================
.include "gr_copy.s"
.include "gr_offsets.s"
.include "gr_pageflip.s"
.include "gr_putsprite_crop.s"
.include "text_print.s"
.include "gr_fast_clear.s"
.include "decompress_fast_v2.s"
.include "keyboard.s"
.include "draw_pointer.s"
.include "audio.s"
.include "graphics_mist/mist_graphics.inc"
.include "end_level.s"
; puzzles
.include "clock_bridge_puzzle.s"
.include "marker_switch.s"
.include "generator_puzzle.s"
; linking books
; letters
.include "letter_cat.s"
.include "common_sprites.inc"
.include "leveldata_mist.inc"
;.align $100
;audio_red_page:
;.incbin "audio/red_page.btc"