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