dos33fsprogs/monkey/monkey.s

; Monkey Monkey

; by deater (Vince Weaver) <vince@deater.net>

; Zero Page
	.include "zp.inc"
	.include "hardware.inc"
	.include "common_defines.inc"

monkey_start:
	;===================
	; init screen
	jsr	TEXT
	jsr	HOME
	bit	KEYRESET

	bit	SET_GR
	bit	PAGE0
	bit	LORES
	bit	TEXTGR

	;=================
	; set up location
	;=================

	lda	#<locations
	sta	LOCATIONS_L
	lda	#>locations
	sta	LOCATIONS_H

	lda	#29
	sta	GUYBRUSH_X
	lda	#18
	sta	GUYBRUSH_Y


	lda	#0
	sta	DRAW_PAGE
	sta	LEVEL_OVER
	sta	GUYBRUSH_DIRECTION

	; init cursor

	lda	#20
	sta	CURSOR_X
	sta	CURSOR_Y

	; set up initial location

	lda	#MONKEY_LOOKOUT
	sta	LOCATION

	jsr	change_location

	lda	#1
	sta	CURSOR_VISIBLE		; visible at first

	lda	#0
	sta	ANIMATE_FRAME

	lda	#VERB_WALK
	sta	CURRENT_VERB

	lda	#$ff
	sta	DESTINATION_X
	sta	DESTINATION_Y

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

	;====================================
	; draw background sprites
	;====================================

	lda	LOCATION
	cmp	#MONKEY_LOOKOUT
	beq	animate_flame
	cmp	#MONKEY_BAR
	beq	do_draw_bar_door

	jmp	nothing_special

animate_flame:
	jsr	draw_fire
	jmp	nothing_special

do_draw_bar_door:
	jsr	draw_bar_door
	jmp	nothing_special

nothing_special:


	;====================================
	; move guybrush
	;====================================

	; only do it every 4th frame
	lda	FRAMEL
	and	#$3
	bne	done_move_guybrush

move_guybrush_x:
	lda	DESTINATION_X
	bmi	move_guybrush_y

	cmp	GUYBRUSH_X
	beq	guybrush_lr_done
	bcs	move_guybrush_right
move_guybrush_left:
	lda	#DIR_LEFT
	sta	GUYBRUSH_DIRECTION
	dec	GUYBRUSH_X
	jmp	move_guybrush_y
move_guybrush_right:
	lda	#DIR_RIGHT
	sta	GUYBRUSH_DIRECTION
	inc	GUYBRUSH_X
	jmp	move_guybrush_y

guybrush_lr_done:

	lda	#$ff
	sta	DESTINATION_X

move_guybrush_y:
	lda	DESTINATION_Y
	bmi	done_move_guybrush

	cmp	GUYBRUSH_Y
	beq	guybrush_ud_done
	bcs	move_guybrush_down
move_guybrush_up:
	lda	#DIR_UP
	sta	GUYBRUSH_DIRECTION
	dec	GUYBRUSH_Y
	dec	GUYBRUSH_Y
	jmp	done_move_guybrush
move_guybrush_down:
	lda	#DIR_DOWN
	sta	GUYBRUSH_DIRECTION
	inc	GUYBRUSH_Y
	inc	GUYBRUSH_Y
	jmp	done_move_guybrush

guybrush_ud_done:

	lda	#$ff
	sta	DESTINATION_Y

done_move_guybrush:

	;====================================
	; draw guybrush
	;====================================

	lda	GUYBRUSH_X
	sta	XPOS
	lda	GUYBRUSH_Y
	sta	YPOS

	lda	GUYBRUSH_Y			; always even
	lsr
	eor	GUYBRUSH_X
	and	#$1				; 0 or 1
	ora	GUYBRUSH_DIRECTION	; 00/01 or 02/03 or 04/05 or 06/07
	asl
	tay

	lda	guybrush_sprites,Y
	sta	INL
	lda	guybrush_sprites+1,Y
	sta	INH

	jsr	put_sprite_crop


	;====================================
	; draw foreground sprites
	;====================================

	lda	LOCATION
	cmp	#MONKEY_LOOKOUT
	beq	do_draw_wall
	cmp	#MONKEY_POSTER
	beq	do_draw_house

	jmp	nothing_foreground

do_draw_wall:
	jsr	draw_wall
	jmp	nothing_foreground

do_draw_house:
	jsr	draw_house
	jmp	nothing_foreground

nothing_foreground:


	;====================================
	; what are we pointing too
	;====================================

	jsr	where_do_we_point

	;====================================
	; update bottom bar
	;====================================

	jsr	update_bottom

	;====================================
	; draw pointer
	;====================================

	jsr	draw_pointer

	;====================================
	; page flip
	;====================================

	jsr	page_flip

	;====================================
	; handle keypress/joystick
	;====================================

	jsr	handle_keypress

	;====================================
	; check if exiting room
	;====================================

	; FIXME: this should be a jump table

	lda	LOCATION
	cmp	#MONKEY_LOOKOUT
	beq	check_exit_lookout
	cmp	#MONKEY_POSTER
	beq	check_exit_poster
	cmp	#MONKEY_DOCK
	beq	check_exit_dock
	cmp	#MONKEY_BAR
	beq	check_exit_bar

check_exit_lookout:
	jsr	lookout_check_exit
	jmp	done_check_exit
check_exit_poster:
	jsr	poster_check_exit
	jmp	done_check_exit
check_exit_dock:
	jsr	dock_check_exit
	jmp	done_check_exit
check_exit_bar:
	jsr	bar_check_exit
	jmp	done_check_exit

done_check_exit:
	;====================================
	; 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



	;==========================
	; includes
	;==========================

	; level graphics
	.include	"graphics/graphics.inc"

	; level data
	.include	"leveldata_monkey.inc"


	.include	"end_level.s"
	.include	"text_print.s"
	.include	"gr_offsets.s"
	.include	"gr_fast_clear.s"
	.include	"keyboard.s"
	.include	"gr_copy.s"
	.include	"gr_putsprite_crop.s"
	.include	"joystick.s"
	.include	"gr_pageflip.s"
	.include	"decompress_fast_v2.s"
	.include	"draw_pointer.s"
	.include	"common_sprites.inc"
	.include	"guy.brush"

	.include	"monkey_lookout.s"
	.include	"monkey_poster.s"
	.include	"monkey_dock.s"
	.include	"monkey_bar.s"

	.include	"monkey_actions.s"
	.include	"update_bottom.s"