310 lines
4.3 KiB
ArmAsm
310 lines
4.3 KiB
ArmAsm
;==============================
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; update explosion timer
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;==============================
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; not ideal (first second might be short)
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; called roughly at 7Hz
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update_explosion_timer:
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ldy #0
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update_exploding_loop:
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lda lemming_exploding,Y
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beq not_done_exploding
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lda lemming_exploding_frame,Y ; roughly 1s?
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cmp #7
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bne not_done_exploding
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lda #0 ; reset
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sta lemming_exploding_frame,Y
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tya
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tax
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inc lemming_exploding,X
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lda lemming_exploding,Y
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cmp #7 ; value is 2+displayed
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bne not_done_exploding
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lda #LEMMING_EXPLODING
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sta lemming_status,Y
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lda #0
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sta lemming_frame,Y
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sta lemming_exploding,Y
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not_done_exploding:
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iny
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cpy #MAX_LEMMINGS
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bne update_exploding_loop
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rts
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;============================
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; update the time
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;============================
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; this gets called approximately once a second
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; updates the time left
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update_time:
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; jsr update_explosion_timer
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sed
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sec
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lda TIME_SECONDS
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sbc #1
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cmp #$99
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bne no_time_uflo
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lda #$59
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dec TIME_MINUTES
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no_time_uflo:
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sta TIME_SECONDS
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cld
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lda TIME_MINUTES
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bne not_over
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lda TIME_SECONDS
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bne not_over
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; out of time
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lda #LEVEL_FAIL
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sta LEVEL_OVER
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not_over:
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draw_time:
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;==============
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; draw minute
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; draw twice, once on each page
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jsr hgr_sprite_as_toggle
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lda TIME_MINUTES
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ldx #35 ; XPOS
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jsr print_one_digit
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jsr hgr_sprite_as_toggle
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lda TIME_MINUTES
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ldx #35 ; XPOS
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jsr print_one_digit
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;================
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; draw seconds
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; draw twice, once on each page
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jsr hgr_sprite_as_toggle
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lda TIME_SECONDS
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ldx #37 ; x location
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sec ; no leading zero removal
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jsr print_two_digits
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jsr hgr_sprite_as_toggle
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lda TIME_SECONDS
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ldx #37 ; x location
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sec ; no leading zero removal
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jmp print_two_digits ; tail call
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;===========================
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;===========================
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; update percent in
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;===========================
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;===========================
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update_percent_in:
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; draw hundreds
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ldy PERCENT_RESCUED_H
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beq not_hundred_yet
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lda bignums_l,Y
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sta INL
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lda bignums_h,Y
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sta INH
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ldx #23
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stx XPOS
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lda #152
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sta YPOS
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jsr hgr_draw_sprite_autoshift
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sec ; no leading zero for rest
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bcs hundreds_entry
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not_hundred_yet:
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; print tens/ones
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clc ; leading zero removal
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hundreds_entry:
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php
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jsr hgr_sprite_as_toggle
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lda PERCENT_RESCUED_L
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ldx #24
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plp
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php
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jsr print_two_digits
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jsr hgr_sprite_as_toggle
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lda PERCENT_RESCUED_L
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ldx #24
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plp
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jmp print_two_digits
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;===========================
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;===========================
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; update lemmings out number
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;===========================
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;===========================
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update_lemmings_out:
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jsr hgr_sprite_as_toggle
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lda LEMMINGS_OUT
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ldx #15
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clc ; leading zero removal
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jsr print_two_digits
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jsr hgr_sprite_as_toggle
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lda LEMMINGS_OUT
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ldx #15
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clc ; leading zero removal
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jmp print_two_digits
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;===========================
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;===========================
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; print one-digit number
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;===========================
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;===========================
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; A is the BCD value
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; X is the X location
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; we assume 152 for Y location
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print_one_digit:
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tay
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lda bignums_l,Y
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sta INL
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lda bignums_h,Y
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sta INH
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stx XPOS
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lda #152
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sta YPOS
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jsr hgr_draw_sprite_autoshift
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rts
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;===========================
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;===========================
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; print two-digit number
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;===========================
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;===========================
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; A is the BCD value
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; X is the X location
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; C set means print 0
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; we assume 152 for Y location
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print_two_digits:
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ldy #0
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bcs ptd_leading_zero
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ldy #10
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ptd_leading_zero:
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sty ptt_lz_smc+1
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stx ptt_smc+1
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inx
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stx pto_smc+1
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print_two_tens:
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; draw tens
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pha
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lsr
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lsr
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lsr
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lsr
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bne no_handle_zero
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clc
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ptt_lz_smc:
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adc #10 ; blank or zero, depending
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no_handle_zero:
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tay
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lda bignums_l,Y
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sta INL
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lda bignums_h,Y
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sta INH
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ptt_smc:
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lda #15
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sta XPOS
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lda #152
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sta YPOS
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jsr hgr_draw_sprite_autoshift
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print_two_ones:
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pla
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and #$f
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tay
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lda bignums_l,Y
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sta INL
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lda bignums_h,Y
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sta INH
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pto_smc:
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lda #16
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sta XPOS
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lda #152
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sta YPOS
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jsr hgr_draw_sprite_autoshift
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rts
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bignums_l:
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.byte <big0_sprite,<big1_sprite,<big2_sprite,<big3_sprite,<big4_sprite
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.byte <big5_sprite,<big6_sprite,<big7_sprite,<big8_sprite,<big9_sprite
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.byte <blank_sprite
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bignums_h:
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.byte >big0_sprite,>big1_sprite,>big2_sprite,>big3_sprite,>big4_sprite
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.byte >big5_sprite,>big6_sprite,>big7_sprite,>big8_sprite,>big9_sprite
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.byte >blank_sprite
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