126 lines
1.5 KiB
ArmAsm
126 lines
1.5 KiB
ArmAsm
; Display falling snow
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; by deater (Vince Weaver) <vince@deater.net>
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; Zero Page
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FRAMEBUFFER = $00 ; $00 - $0F
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YPOS = $10
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YPOS_SIN = $11
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CH = $24
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CV = $25
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GBASL = $26
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GBASH = $27
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BASL = $28
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BASH = $29
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FRAME = $60
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WAITING = $62
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LETTERL = $63
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LETTERH = $64
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LETTERX = $65
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LETTERY = $66
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LETTERD = $67
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LETTER = $68
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BLARGH = $69
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HGR_COLOR = $E4
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STATE = $ED
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DRAW_PAGE = $EE
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LASTKEY = $F1
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PADDLE_STATUS = $F2
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TEMP = $FA
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SNOWX = $F0
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.include "hardware.inc"
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;==================================
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;==================================
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jsr hgr
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bit PAGE0
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bit SET_GR
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bit FULLGR
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bit HIRES
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display_loop:
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;=========================
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; erase old snow
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ldx #0
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jsr hcolor_equals
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ldx #0
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erase_loop:
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stx SNOWX
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ldx SNOWX
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ldy snow_xhs,X
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lda snow_ys,X
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pha
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lda snow_xls,X
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tax
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pla
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jsr hplot0
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inc SNOWX
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ldx SNOWX
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cpx #8
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bne erase_loop
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;=========================
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; draw new snow
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ldx #3
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jsr hcolor_equals
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ldx #0
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draw_loop:
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stx SNOWX
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ldx SNOWX
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inc snow_ys,X
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lda snow_ys,X
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cmp #192
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bne snow_done
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lda #0
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sta snow_ys,X
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snow_done:
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ldy snow_xhs,X
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lda snow_ys,X
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pha
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lda snow_xls,X
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tax
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pla
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jsr hplot0
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inc SNOWX
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ldx SNOWX
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cpx #8
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bne draw_loop
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jmp display_loop ; 3
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snow_xls:
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.byte 10,30,50,70,90,110,0,10
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snow_xhs:
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.byte 0,0,0,0,0,0,1,1
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snow_ys:
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.byte 0,0,0,0,0,0,0,0
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;.include "state_machine.s"
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;.include "gr_hline.s"
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;.include "../asm_routines/keypress.s"
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;.include "gr_copy.s"
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;.include "random16.s"
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;.include "fw.s"
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.include "hgr.s"
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