mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-09 07:29:32 +00:00
188 lines
2.5 KiB
ArmAsm
188 lines
2.5 KiB
ArmAsm
; do a (hopefully fast) roto-zoom
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do_rotozoom:
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;================================
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; Clear screen and setup graphics
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;================================
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bit PAGE1 ; set page 1
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bit LORES ; Lo-res graphics
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lda #0
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sta DISP_PAGE
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lda #4
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sta DRAW_PAGE
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;===================================
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; Clear top/bottom of page 0 and 1
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;===================================
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jsr clear_screens
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;===================================
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; init the multiply tables
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;===================================
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jsr init_multiply_tables
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;======================
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; show the title screen
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;======================
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; Title Screen
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title_screen:
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load_background:
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;===========================
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; Clear both bottoms
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; jsr clear_bottoms
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;=============================
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; Load title
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lda #<lens_zx02
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sta zx_src_l+1
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lda #>lens_zx02
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sta zx_src_h+1
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lda #$40
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jsr zx02_full_decomp
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;=================================
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; copy to both pages
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jsr gr_copy_to_current
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jsr page_flip
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jsr gr_copy_to_current
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jsr wait_until_keypress
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;=================================
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; main loop
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lda #0
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sta ANGLE
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sta SCALE_F
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sta FRAMEL
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lda #1
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sta SCALE_I
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main_loop:
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jsr rotozoom
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jsr page_flip
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lda KEYPRESS ; 4
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bpl no_keypress
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bit KEYRESET ; clear the keyboard buffer
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rts
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no_keypress:
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clc
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lda FRAMEL
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adc direction
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sta FRAMEL
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cmp #$f8
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beq back_at_zero
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cmp #33
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beq at_far_end
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bne done_reverse
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back_at_zero:
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at_far_end:
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; change bg color
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lda roto_color_even_smc+1
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clc
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adc #$01
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and #$0f
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sta roto_color_even_smc+1
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lda roto_color_odd_smc+1
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clc
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adc #$10
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and #$f0
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sta roto_color_odd_smc+1
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; reverse direction
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lda direction
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eor #$ff
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clc
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adc #1
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sta direction
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lda scaleaddl
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eor #$ff
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clc
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adc #1
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sta scaleaddl
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lda scaleaddh
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eor #$ff
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adc #0
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sta scaleaddh
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done_reverse:
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clc
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lda ANGLE
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adc direction
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and #$1f
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sta ANGLE
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clc
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lda SCALE_F
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adc scaleaddl
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sta SCALE_F
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lda SCALE_I
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adc scaleaddh
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sta SCALE_I
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jmp main_loop
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direction: .byte $01
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scaleaddl: .byte $10
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scaleaddh: .byte $00
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;===============================================
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; External modules
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;===============================================
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.include "rotozoom.s"
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.include "gr_pageflip.s"
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;.include "gr_fast_clear.s"
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.include "gr_copy.s"
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.include "gr_offsets.s"
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.include "c00_scrn_offsets.s"
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.include "multiply_fast.s"
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;===============================================
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; Data
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;===============================================
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lens_zx02:
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.incbin "graphics/lenspic.gr.zx02"
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