mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-18 06:09:08 +00:00
152 lines
2.0 KiB
ArmAsm
152 lines
2.0 KiB
ArmAsm
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;==========================
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; check keyboard
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; for main game
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;==========================
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; Movement
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; Note in the game, pressing a key starts walking
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; To stop you have to press the same direction again
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; Text
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; We require ENTER/RETURN pressed before entering text
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; this is mildly annoying, but lets us use
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; WASD to walk. The Apple II+ doesn't have
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; up or down buttons
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check_keyboard:
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lda KEYPRESS
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bmi key_was_pressed
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rts
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key_was_pressed:
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and #$7f ; strip off high bit
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;==========================
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; Left
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;==========================
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check_left:
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cmp #$8
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beq left_pressed
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cmp #'A'
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bne check_right
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left_pressed: ; if peasant_moving_left, stop
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; otherwise clear all movement, move left
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ldx PEASANT_XADD
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jsr stop_peasant
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cpx #$FF ; if not left, start moving left
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beq continue_left
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lda #$FF ; move left
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sta PEASANT_XADD
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continue_left:
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lda #PEASANT_DIR_LEFT
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sta PEASANT_DIR
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jmp done_check_keyboard
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check_right:
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cmp #$15
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beq right_pressed
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cmp #'D'
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bne check_up
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right_pressed:
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ldx PEASANT_XADD
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jsr stop_peasant
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cpx #$1 ; if already right, stop
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beq continue_right
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lda #$1
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sta PEASANT_XADD
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continue_right:
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lda #PEASANT_DIR_RIGHT
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sta PEASANT_DIR
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jmp done_check_keyboard
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check_up:
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cmp #'W'
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beq up_pressed
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cmp #$0B
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bne check_down
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up_pressed:
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ldx PEASANT_YADD
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jsr stop_peasant
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cpx #$FC ; if already up, stop
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beq continue_up
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lda #$FC
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sta PEASANT_YADD
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continue_up:
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lda #PEASANT_DIR_UP
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sta PEASANT_DIR
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jmp done_check_keyboard
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check_down:
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cmp #'S'
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beq down_pressed
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cmp #$0A
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bne check_enter
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down_pressed:
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ldx PEASANT_YADD
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jsr stop_peasant
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cpx #$04 ; if already down, stop
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beq continue_down
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lda #$4
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sta PEASANT_YADD
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continue_down:
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lda #PEASANT_DIR_DOWN
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sta PEASANT_DIR
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jmp done_check_keyboard
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check_enter:
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cmp #13
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beq enter_pressed
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cmp #' '
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bne done_check_keyboard
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enter_pressed:
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jsr clear_bottom
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jsr hgr_input
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jsr parse_input
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jsr clear_bottom
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done_check_keyboard:
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bit KEYRESET
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rts
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stop_peasant:
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lda #0
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sta PEASANT_XADD
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sta PEASANT_YADD
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rts
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