mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-05-29 08:41:36 +00:00
191 lines
3.4 KiB
ArmAsm
191 lines
3.4 KiB
ArmAsm
; attempt at rotate-by-shear
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; zero-page
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GBASL = $26
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GBASH = $27
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; soft-switches
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FULLGR = $C052
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; ROM routines
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PLOT = $F800 ;; PLOT AT Y,A
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SETGR = $FB40
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rotate:
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jsr SETGR
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bit FULLGR
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ldx #8
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box_loop:
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ldy #12
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txa
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jsr PLOT
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lda #$ff
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draw_line:
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sta (GBASL),Y
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iny
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cpy #28
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bne draw_line
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inx
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inx
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cpx #40
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bne box_loop
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shear_right:
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ldx #0
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shear_right_loop:
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ldy #0 ; set GBASL/GBASL
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txa
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jsr PLOT
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lda GBASL
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sta rlin_smc+1
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lda GBASH
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sta rlin_smc+2
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clc
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lda x_shift,X
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adc GBASL
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sta rlout_smc+1
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lda #0
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adc GBASH
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sta rlout_smc+2
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ldy #39
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rlinner_loop:
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rlin_smc:
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lda $400,Y
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rlout_smc:
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sta $400,Y
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dey
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bpl rlinner_loop
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inx
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inx
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cpx #48
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bne shear_right_loop
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done:
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jmp done
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.if 0
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5 GR
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10 FOR Y=5 TO 43:COLOR=Y:HLIN5,35ATY:NEXT
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15 INPUT R
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20 A=(R*3.14)/180:T=TAN(A/2):S=SIN(A)
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30 GOSUB 1000
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130 FOR X=0 TO 39:O=(X-20)*S:IF O<0 GOTO 160
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150 FOR Y=0 TO 47:C=0:IF ((Y+O)>0) AND ((Y+O)<47) THEN C=SCRN(X,Y+O)
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155 GOTO 170
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160 FOR Y=47 TO 0 STEP -1:C=0:IF ((Y+O)>0) AND ((Y+O)<47) THEN C=SCRN(X,Y+O)
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170 COLOR=C:PLOT X,Y:NEXT Y,X
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200 GOSUB 1000
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300 END
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1000 FOR Y=0 TO 47:O=-(Y-24)*T:IF O<0 GOTO 1030
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1010 FOR X=0 TO 39:C=0:IF ((X+O)>0) AND ((X+O)<39) THEN C=SCRN(X+O,Y)
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1020 GOTO 1040
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1030 FOR X=39 TO 0 STEP -1:C=0:IF ((X+O)>0) AND ((X+O)<39) THEN C=SCRN(X+O,Y)
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1040 COLOR=C:PLOT X,Y:NEXT X,Y:RETURN
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.endif
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x_shift:
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.byte $F9 ; 0 -7.653669
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.byte $F9 ; 1 -7.270985
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.byte $FA ; 2 -6.888302
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.byte $FA ; 3 -6.505618
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.byte $FA ; 4 -6.122935
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.byte $FB ; 5 -5.740251
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.byte $FB ; 6 -5.357568
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.byte $FC ; 7 -4.974885
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.byte $FC ; 8 -4.592201
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.byte $FC ; 9 -4.209518
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.byte $FD ; 10 -3.826834
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.byte $FD ; 11 -3.444151
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.byte $FD ; 12 -3.061467
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.byte $FE ; 13 -2.678784
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.byte $FE ; 14 -2.296101
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.byte $FF ; 15 -1.913417
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.byte $FF ; 16 -1.530734
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.byte $FF ; 17 -1.148050
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.byte $00 ; 18 -0.765367
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.byte $00 ; 19 -0.382683
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.byte $00 ; 20 0.000000
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.byte $00 ; 21 0.382683
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.byte $00 ; 22 0.765367
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.byte $01 ; 23 1.148050
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.byte $01 ; 24 1.530734
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.byte $01 ; 25 1.913417
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.byte $02 ; 26 2.296101
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.byte $02 ; 27 2.678784
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.byte $03 ; 28 3.061467
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.byte $03 ; 29 3.444151
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.byte $03 ; 30 3.826834
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.byte $04 ; 31 4.209518
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.byte $04 ; 32 4.592201
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.byte $04 ; 33 4.974885
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.byte $05 ; 34 5.357568
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.byte $05 ; 35 5.740251
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.byte $06 ; 36 6.122935
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.byte $06 ; 37 6.505618
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.byte $06 ; 38 6.888302
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.byte $07 ; 39 7.270985
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y_shift:
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.byte $04 ; 0 4.773897
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.byte $04 ; 1 4.574984
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.byte $04 ; 2 4.376072
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.byte $04 ; 3 4.177160
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.byte $03 ; 4 3.978247
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.byte $03 ; 5 3.779335
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.byte $03 ; 6 3.580423
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.byte $03 ; 7 3.381510
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.byte $03 ; 8 3.182598
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.byte $02 ; 9 2.983686
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.byte $02 ; 10 2.784773
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.byte $02 ; 11 2.585861
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.byte $02 ; 12 2.386948
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.byte $02 ; 13 2.188036
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.byte $01 ; 14 1.989124
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.byte $01 ; 15 1.790211
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.byte $01 ; 16 1.591299
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.byte $01 ; 17 1.392387
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.byte $01 ; 18 1.193474
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.byte $00 ; 19 0.994562
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.byte $00 ; 20 0.795649
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.byte $00 ; 21 0.596737
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.byte $00 ; 22 0.397825
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.byte $00 ; 23 0.198912
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.byte $00 ; 24 0.000000
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.byte $00 ; 25 -0.198912
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.byte $00 ; 26 -0.397825
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.byte $00 ; 27 -0.596737
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.byte $00 ; 28 -0.795649
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.byte $00 ; 29 -0.994562
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.byte $FF ; 30 -1.193474
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.byte $FF ; 31 -1.392387
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.byte $FF ; 32 -1.591299
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.byte $FF ; 33 -1.790211
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.byte $FF ; 34 -1.989124
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.byte $FE ; 35 -2.188036
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.byte $FE ; 36 -2.386948
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.byte $FE ; 37 -2.585861
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.byte $FE ; 38 -2.784773
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.byte $FE ; 39 -2.983686
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.byte $FD ; 40 -3.182598
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.byte $FD ; 41 -3.381510
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.byte $FD ; 42 -3.580423
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.byte $FD ; 43 -3.779335
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.byte $FD ; 44 -3.978247
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.byte $FC ; 45 -4.177160
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.byte $FC ; 46 -4.376072
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.byte $FC ; 47 -4.574984
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