mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-16 23:20:43 +00:00
304 lines
5.3 KiB
ArmAsm
304 lines
5.3 KiB
ArmAsm
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HGR_SHAPE = $1A
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HGR_SHAPE_H = $1B
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HGR_BITS = $1C
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HGR_COUNT = $1D
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HMASK = $30
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DSCTMP = $9D
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HGR_DX = $D0
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HGR_DX_H = $D1
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HGR_DY = $D2
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HGR_QUADRANT = $D3
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HGR_E = $D4
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HGR_E_H = $D5
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HGR_X = $E0
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HGR_X_H = $E1
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HGR_Y = $E2
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;HGR_COLOR = $E4
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HGR_HORIZ = $E5
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HGR_PAGE = $E6
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TXTCLR = $C050
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MIXSET = $C053
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LOWSCR = $C054
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MIXCLR = $C052
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HISCR = $C055
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;.align $100
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.assert >hgr = >hgr_after, error, "hgr crosses page"
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;==========================
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; HGR
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;==========================
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hgr:
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; F3E2
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lda #$20 ; HIRES Page 1 at $2000
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bit LOWSCR ; BIT SW.LOWSCR Use PAGE1 ($C054)
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; bit MIXSET ; BIT SW.MIXSET (Mixed text)
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sethpg:
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; F3EA
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sta HGR_PAGE
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; lda HIRES
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; lda TXTCLR
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hclr:
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lda #0 ; black background
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sta HGR_BITS
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bkgnd:
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; F3F6
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lda HGR_PAGE
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sta HGR_SHAPE+1
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ldy #0
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sty HGR_SHAPE
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bkgnd_loop:
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lda HGR_BITS
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sta (HGR_SHAPE),y
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jsr color_shift
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iny
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bne bkgnd_loop
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inc HGR_SHAPE+1
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lda HGR_SHAPE+1
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and #$1f ; see if $40 or $60
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bne bkgnd_loop
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rts
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hgr_after:
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.assert >msktbl = >msktbl_after, error, "msktbl crosses page"
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msktbl: .byte $81,$82,$84,$88,$90,$A0,$C0 ; original
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msktbl_after:
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.align $100
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.assert >hposn = >hposn_after, error, "hposn crosses page"
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;====================================================
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; HPOSN
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; time = 9 + 61 + 31 + 22 + 42 + 22 + 23 = 210
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hposn:
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; F411: move values into expected zp locations
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sta HGR_Y ; 3
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stx HGR_X ; 3
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sty HGR_X+1 ; 3
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;===========
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; 9
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; calc y-position addr. no lookup table?
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pha ; 3
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and #$C0 ; 2
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sta GBASL ; 3
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lsr ; 2
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lsr ; 2
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ora GBASL ; 3
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sta GBASL ; 3
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pla ; 4
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sta GBASH ; 3
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asl ; 2
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asl ; 2
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asl ; 2
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rol GBASH ; 5
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asl ; 2
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rol GBASH ; 5
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asl ; 2
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ror GBASL ; 5
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lda GBASH ; 3
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and #$1f ; 2
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ora HGR_PAGE ; 3
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sta GBASH ; 3
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;============
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; 61
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; F438
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; divide/mod 16-bit x poisition by 7
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; incoming, X=(y,x)
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; outgoing y=q, a=r
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; Divide by 7 (From December '84 Apple Assembly Line)
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txa ; 2
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clc ; 2
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sta HGR_HORIZ ; 3
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lsr ; 2
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lsr ; 2
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lsr ; 2
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adc HGR_HORIZ ; 3
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ror ; 2
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lsr ; 2
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lsr ; 2
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adc HGR_HORIZ ; 3
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ror ; 2
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lsr ; 2
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lsr ; 2
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; x/7 is in A
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;============
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; 31
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; calculate remainder
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clc ; 2
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sta HGR_HORIZ ; 3
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asl ; 2
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adc HGR_HORIZ ; 3
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asl ; 2
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adc HGR_HORIZ ; 3
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; HGR_HORIZ=x/7, A=HGR_HORIZ*7
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; calculate remainder by X-(Q*7)
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sec ; 2
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eor #$ff ; 2
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adc HGR_X ; 3
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; A = remainder ;===========
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; 22
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;============================================================================
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cpy #0 ; 2
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beq done_mod_nop_23 ; 3
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;==========
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; 5
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theres_high:
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; -1
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clc ; 2
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adc #4 ; make remainder match ; 2
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pha ; 3
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lda HGR_HORIZ ; 3
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adc #36 ; 2
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sta HGR_HORIZ ; 3
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pla ; 4
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cmp #7 ; 2
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bcc done_mod_nop14 ; blt ; 3
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;============
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; 23
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; -1
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sec ; 2
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sbc #7 ; 2
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inc HGR_HORIZ ; 5
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ldy HGR_HORIZ ; nop ; 3
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jmp done_mod ; 3
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;============
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; 14
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;===========================
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; Y=HIGH,bcc = 5+23+ 14 = 42
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; Y=HIGH,bcs = 5+23+ 14 = 42
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; Y=LOW = 5 + 14+23 = 42
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done_mod_nop_23:
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inc HGR_HORIZ,X ; (nop) ; 6
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dec HGR_HORIZ,X ; (nop) ; 6
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ldy HGR_HORIZ ; (nop) ; 3
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ldy HGR_HORIZ ; (nop) ; 3
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ldy HGR_HORIZ ; (nop) ; 3
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nop ; 2
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done_mod_nop14:
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inc HGR_HORIZ,X ; (nop) ; 6
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dec HGR_HORIZ,X ; (nop) ; 6
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nop ; 2
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done_mod:
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ldy HGR_HORIZ ; 3
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tax ; 2
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lda msktbl,x ; 4+
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sta HMASK ; 3
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tya ; 2
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lsr ; 2
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lda HGR_COLOR ; 3
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sta HGR_BITS ; 3
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;===========
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; 22
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bcs color_shift ; 3
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; cs = 3+20
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;-1
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; need 23 = 2+6+X = 15
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inc HMASK,X ; nop ; 6
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dec HMASK,X ; nop ; 6
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lda HMASK ; nop ; 3
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rts ; 6
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;===========
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; 23
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;===================================
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; COLOR_SHIFT
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;===================================
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; positive = 7+(7)+6 = 20
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; negative = 7+ 7 +6 = 20
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color_shift: ; F47E
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asl ; 2
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cmp #$c0 ; 2
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bpl done_color_shift ; 3
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; -1
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lda HGR_BITS ; 3
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eor #$7f ; 2
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sta HGR_BITS ; 3
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rts ; 6
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done_color_shift:
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lda HGR_BITS ; nop ; 3
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nop ; 2
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nop ; 2
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rts ; 6
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hposn_after:
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;.align $100
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.assert >hplot0 = >hplot0_after, error, "hplot0 crosses page"
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;=====================================
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; HPLOT0
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;=====================================
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; point in (YX),A
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; 244 cycles
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hplot0:
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; F457
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jsr hposn ; 6+210
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lda HGR_BITS ; 3
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eor (GBASL),y ; 5+
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and HMASK ; 3
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eor (GBASL),y ; 5+
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sta (GBASL),y ; 6
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rts ; 6
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;============
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; 244
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hplot0_after:
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.assert >hcolor_equals = >hcolor_equals_after, error, "hce crosses page"
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;=============================
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; HCOLOR_EQUALS
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;=============================
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; Color in X
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; 13 cycles
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hcolor_equals:
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; F6E9
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; TODO: mask to be less than 8
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lda colortbl,x ; 4+
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sta HGR_COLOR ; 3
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rts ; 6
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colortbl:
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.byte $00,$2A,$55,$7F,$80,$AA,$D5,$FF
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hcolor_equals_after:
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