dos33fsprogs/games/duke/keyboard.s

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JUMP_HEIGHT = 8
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;==============================
; Handle Keypress
;==============================
handle_keypress:
; first handle joystick
lda JOYSTICK_ENABLED
beq actually_handle_keypress
; only check joystick every-other frame
lda FRAMEL
and #$1
beq actually_handle_keypress
check_button:
lda PADDLE_BUTTON0
bpl button_clear
lda JS_BUTTON_STATE
bne js_check
lda #1
sta JS_BUTTON_STATE
lda #' '
jmp check_sound
button_clear:
lda #0
sta JS_BUTTON_STATE
js_check:
jsr handle_joystick
js_check_left:
lda value0
cmp #$20
bcs js_check_right ; if less than 32, left
lda #'A'
bne check_sound
js_check_right:
cmp #$40
bcc js_check_up
lda #'D'
bne check_sound
js_check_up:
lda value1
cmp #$20
bcs js_check_down
lda #'W'
bne check_sound
js_check_down:
cmp #$40
bcc done_joystick
lda #'S'
bne check_sound
done_joystick:
actually_handle_keypress:
lda KEYPRESS
bmi keypress
jmp no_keypress
keypress:
and #$7f ; clear high bit
cmp #' '
beq check_sound ; make sure not to lose space
and #$df ; convert uppercase to lower case
check_sound:
cmp #$14 ; control-T
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bne check_help
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lda SOUND_STATUS
eor #SOUND_DISABLED
sta SOUND_STATUS
jmp done_keypress
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check_help:
cmp #'H' ; H (^H is same as left)
bne check_joystick
jsr print_help
jmp done_keypress
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; can't be ^J as that's the same as down
check_joystick:
cmp #'J' ; J
bne check_left
lda JOYSTICK_ENABLED
eor #1
sta JOYSTICK_ENABLED
jmp done_keypress
check_left:
cmp #'A'
beq left_pressed
cmp #8 ; left key
bne check_right
left_pressed:
lda DUKE_DIRECTION
cmp #$ff ; check if facing left
bne face_left
lda #1
sta DUKE_WALKING
jmp done_left_pressed
face_left:
lda #$ff
sta DUKE_DIRECTION
lda #0
sta DUKE_WALKING
done_left_pressed:
jmp done_keypress
check_right:
cmp #'D'
beq right_pressed
cmp #$15 ; right key
bne check_up
right_pressed:
lda DUKE_DIRECTION
cmp #$1 ; check if facing right
bne face_right
lda #1
sta DUKE_WALKING
jmp done_left_pressed
face_right:
lda #$1
sta DUKE_DIRECTION
lda #0
sta DUKE_WALKING
done_right_pressed:
jmp done_keypress
check_up:
cmp #'W'
beq up_pressed
cmp #$0B ; up key
bne check_down
up_pressed:
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jsr up_action
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done_up_pressed:
jmp done_keypress
check_down:
cmp #'S'
beq down_pressed
cmp #$0A
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bne check_space
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down_pressed:
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done_down_pressed:
jmp done_keypress
check_space:
cmp #' '
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bne check_return
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space_pressed:
; jump
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lda DUKE_JUMPING
bne done_keypress ; don't jump if already jumping
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lda DUKE_FALLING
bne done_keypress ; don't jump if falling
lda #JUMP_HEIGHT
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sta DUKE_JUMPING
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jsr jump_noise
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jmp done_keypress
check_return:
cmp #13
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bne check_escape
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return_pressed:
; shoot
lda LASER_OUT
bne done_return
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jsr laser_noise
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lda DUKE_DIRECTION
sta LASER_DIRECTION
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lda #2
sta DUKE_SHOOTING
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cmp #1
beq laser_right
laser_left:
lda DUKE_X
sec
sbc #1
jmp laser_assign
laser_right:
lda DUKE_X
clc
adc #2
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laser_assign:
sta LASER_X
lda DUKE_Y
clc
adc #4
sta LASER_Y
inc LASER_OUT
done_return:
jmp no_keypress
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check_escape:
cmp #27
bne done_keypress
jsr print_quit
jmp done_keypress
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done_keypress:
no_keypress:
bit KEYRESET
rts