155 lines
2.7 KiB
ArmAsm
155 lines
2.7 KiB
ArmAsm
;=================================
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; Display a sequence of images
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;=================================
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; quit if escape pressed?
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; this version (as opposed to original) the time delay is
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; *after* showing the image
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; pattern is TIME, PTR
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; if time== 0, then done
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; if time==1 or 129, then no pause
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; if time== 255, reload background $C00 with PTR, no delay
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; if time== 2..127, overlay PTR over $C00, then wait TIME
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; if time==130..254, overlay current over $C00, then wait TIME-128
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; assumes LZSA pointer points to image
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; basically after decoding one, input points to next
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run_sequence:
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ldy #0
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run_sequence_loop:
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lda (INTRO_LOOPL),Y ; get time
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beq run_sequence_done ; if zero, then done
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cmp #$ff ; if $ff, then load image to $c00
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bne not_reload
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; reload background
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reload_bg:
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iny
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lda (INTRO_LOOPL),Y
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sta getsrc_smc+1 ; LZSA_SRC_LO
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iny
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lda (INTRO_LOOPL),Y
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sta getsrc_smc+2 ; LZSA_SRC_HI
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iny
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sty INTRO_LOOPER ; save for later
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lda #$0c ; load to $c00
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jsr decompress_lzsa2_fast
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jmp seq_stuff
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not_reload:
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tax ; load delay into X
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bmi no_set_image_ptr ; if negative, no need to load pointer
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; need to get image pointer from data stream
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get_image_ptr:
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iny
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lda (INTRO_LOOPL),Y
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sta getsrc_smc+1 ; LZSA_SRC_LO
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iny
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lda (INTRO_LOOPL),Y
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sta getsrc_smc+2 ; LZSA_SRC_HI
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no_set_image_ptr:
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; decompress image
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txa
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pha ; save X on stack
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iny
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sty INTRO_LOOPER ; save for later
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lda #$10 ; load to $1000
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jsr decompress_lzsa2_fast
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; display image and page flip
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jsr gr_overlay
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jsr page_flip
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pla ; restore X from stack
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and #$7f
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tax
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cpx #1
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beq seq_no_wait
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jsr long_wait
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seq_no_wait:
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seq_stuff:
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ldy INTRO_LOOPER
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; exit early if escape pressed
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lda KEYPRESS
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cmp #27+$80
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beq run_sequence_done
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bit KEYRESET
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jmp run_sequence_loop
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run_sequence_done:
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rts
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;====================================
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; Display a sequence of images 40x40
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run_sequence_40x40:
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ldy #0
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run_sequence_40x40_loop:
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lda (INTRO_LOOPL),Y ; get time
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beq run_sequence_40x40_done
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tax
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jsr long_wait
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iny
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lda (INTRO_LOOPL),Y
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sta getsrc_smc+1 ; LZSA_SRC_LO
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iny
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lda (INTRO_LOOPL),Y
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sta getsrc_smc+2 ; LZSA_SRC_HI
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iny
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sty INTRO_LOOPER ; save for later
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lda #$10 ; load to $1000
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jsr decompress_lzsa2_fast
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jsr gr_overlay_40x40
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jsr page_flip
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ldy INTRO_LOOPER
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jmp run_sequence_40x40_loop
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run_sequence_40x40_done:
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rts
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;=====================
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; WAIT: delay 1/2(26+27A+5A^2) us
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; A=60 approx 9.823ms
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; A=61 approx 10.139ms
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; A=62 approx 10.460ms
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; A=63 approx 10.786ms
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; A=64 approx 11.117ms
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;
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;=====================
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; long(er) wait
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; waits approximately X*10 ms
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; X=100 1s
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; X=4 = 40ms= 1/25s
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long_wait:
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lda #60
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jsr WAIT ; delay
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dex
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bne long_wait
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rts
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