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187 lines
3.3 KiB
ArmAsm
187 lines
3.3 KiB
ArmAsm
;
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; Christian Groessler, October 2001
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;
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; this file provides an equivalent to the BASIC GRAPHICS function
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;
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; int __fastcall__ graphics(unsigned char mode);
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;
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;
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.export _graphics
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.constructor initscrmem,28
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.import findfreeiocb
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.import __seterrno,__do_oserror,__oserror
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.import fddecusage
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.import clriocb
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.import fdtoiocb
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.import newfd
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.import __graphmode_used
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.importzp tmp1,tmp2,tmp3
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.include "atari.inc"
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.include "errno.inc"
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.code
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; set new grapics mode
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; gets new mode in A
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; returns handle or -1 on error
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; uses tmp1, tmp2, tmp3, tmp4 (in subroutines)
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.proc _graphics
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; tax
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; and #15 ; get required graphics mode
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; cmp #12
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; bcs invmode ; invalid mode
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; txa
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; and #$c0 ; invalid bits set?
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; bne invmode
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; stx tmp1
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sta tmp1 ; remember graphics mode
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parmok: jsr findfreeiocb
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beq iocbok ; we found one
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lda #<EMFILE ; "too many open files"
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ldx #>EMFILE
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seterr: jsr __seterrno
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lda #$FF
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tax
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rts ; return -1
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;invmode:ldx #>EINVAL
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; lda #<EINVAL
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; bne seterr
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iocbok: txa
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tay ; move iocb # into Y
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lda #3
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sta tmp3 ; name length + 1
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lda #<scrdev
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ldx #>scrdev
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jsr newfd
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tya
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tax
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bcs doopen ; C set: open needed
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ldx #0
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lda tmp2 ; get fd used
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jsr fdtoiocb
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tax
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doopen: txa
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;brk
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pha
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jsr clriocb
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pla
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tax
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lda #<scrdev
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sta ICBAL,x
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lda #>scrdev
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sta ICBAH,x
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lda #OPEN
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sta ICCOM,x
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lda tmp1 ; get requested graphics mode
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and #15
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sta ICAX2,x
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lda tmp1
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and #$30
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eor #$10
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ora #12
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sta ICAX1,x
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jsr CIOV
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bmi cioerr
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lda tmp2 ; get fd
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ldx #0
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stx __oserror
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rts
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cioerr: jsr fddecusage ; decrement usage counter of fd as open failed
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jmp __do_oserror
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.endproc ; _graphics
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; calc. upper memory limit to use
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.proc initscrmem
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lda __graphmode_used
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beq ignore ; mode 0 doesn't need adjustment
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cmp #32
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bcs ignore ; invalid value
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asl a
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tay
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lda APPMHI
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sec
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sbc grmemusage,y
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sta APPMHI
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lda APPMHI+1
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sbc grmemusage+1,y
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sta APPMHI+1
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ignore: rts
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.endproc ; initscrmem
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.rodata
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scrdev: .byte "S:", 0
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; memory usage of the different graphics modes (0-31)
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; values < 0 of "bytes needed" are mappped to 0
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; bytes needed ; mode ; val. of MEMTOP
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grmemusage:
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.word 0 ; 0 ; 39967
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.word 0 ;-318 ; 1 ; 40285
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.word 0 ;-568 ; 2 ; 40535
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.word 0 ;-558 ; 3 ; 40525
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.word 0 ;-298 ; 4 ; 40265
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.word 182 ; 5 ; 39785
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.word 1182 ; 6 ; 38785
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.word 3198 ; 7 ; 36769
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.word 7120 ; 8 ; 32847
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.word 7146 ; 9 ; 32821
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.word 7146 ; 10 ; 32821
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.word 7146 ; 11 ; 32821
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.word 162 ; 12 ; 39805
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.word 0 ;-328 ; 13 ; 40295
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.word 3278 ; 14 ; 36689
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.word 7120 ; 15 ; 32847
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.word 0 ; 16 ; 39967
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.word 0 ;-320 ; 17 ; 40287
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.word 0 ;-572 ; 18 ; 40539
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.word 0 ;-560 ; 19 ; 40527
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.word 0 ;-296 ; 20 ; 40263
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.word 184 ; 21 ; 39783
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.word 1192 ; 22 ; 38775
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.word 3208 ; 23 ; 36759
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.word 7146 ; 24 ; 32821
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.word 7146 ; 25 ; 32821
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.word 7146 ; 26 ; 32821
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.word 7146 ; 27 ; 32821
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.word 160 ; 28 ; 39807
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.word 0 ;-332 ; 29 ; 40299
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.word 3304 ; 30 ; 36663
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.word 7146 ; 31 ; 32821
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; the program used to get these values (Atari BASIC):
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; 100 FILE=0
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; 110 IF FILE=1 THEN OPEN #1,8,0,"D:FREEMEM.OUT"
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; 120 IF FILE<>1 THEN OPEN #1,8,0,"E:"
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; 200 DIM G(32)
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; 210 FOR I=0 TO 32:GRAPHICS I:GOSUB 1000:G(I)=VAL:NEXT I
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; 220 GRAPHICS 0
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; 230 FOR I=0 TO 31:PRINT #1;I;":",G(I);" - ";G(0)-G(I):NEXT I
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; 240 CLOSE #1
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; 999 END
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; 1000 VAL=PEEK(741)+256*PEEK(742)
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; 1010 RETURN
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