mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-07-06 07:28:58 +00:00
218 lines
2.6 KiB
ArmAsm
218 lines
2.6 KiB
ArmAsm
; Ootw
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.include "zp.inc"
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.include "hardware.inc"
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title_screen:
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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 #>(planet_rle)
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sta GBASH
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lda #<(planet_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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game_loop:
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; check keyboard
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jsr handle_keypress
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; copy background to current page
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jsr gr_copy_to_current
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; draw physicist
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jsr draw_physicist
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; draw bad guys
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; draw foreground
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lda #>foreground_plant
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sta INH
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lda #<foreground_plant
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sta INL
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lda #4
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sta XPOS
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lda #30
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sta YPOS
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jsr put_sprite
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; page flip
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jsr page_flip
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; pause?
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; loop forever
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jmp game_loop
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;======================================
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; handle keypress
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;======================================
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handle_keypress:
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lda KEYPRESS ; 4
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bpl no_keypress ; 3
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; -1
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and #$7f ; clear high bit
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check_left:
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cmp #'A'
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beq left
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cmp #$8 ; left arrow
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bne check_right
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left:
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lda DIRECTION
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bne face_left
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dec PHYSICIST_X
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inc GAIT
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inc GAIT
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jmp done_keypress
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face_left:
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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
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check_right:
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cmp #'D'
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beq right
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cmp #$15
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bne unknown
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right:
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lda DIRECTION
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beq face_right
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inc PHYSICIST_X
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inc GAIT
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inc GAIT
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jmp done_keypress
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face_right:
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lda #0
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sta GAIT
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lda #1
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sta DIRECTION
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jmp done_keypress
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unknown:
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done_keypress:
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bit KEYRESET ; clear the keyboard strobe ; 4
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no_keypress:
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rts ; 6
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;======================================
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; draw physicist
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;======================================
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draw_physicist:
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lda GAIT
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and #$f
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sta GAIT
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tax
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lda phys_walk_progression,X
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sta INL
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lda phys_walk_progression+1,X
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sta INH
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lda PHYSICIST_X
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sta XPOS
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lda PHYSICIST_Y
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sta YPOS
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lda DIRECTION
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bne facing_right
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facing_left:
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jmp put_sprite
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facing_right:
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jmp put_sprite_flipped
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.include "gr_pageflip.s"
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.include "gr_unrle.s"
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.include "gr_fast_clear.s"
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.include "gr_copy.s"
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.include "gr_putsprite.s"
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.include "gr_offsets.s"
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.include "ootw_backgrounds.inc"
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.include "ootw_sprites.inc"
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