mirror of
https://github.com/cc65/cc65.git
synced 2024-12-27 15:29:46 +00:00
99 lines
2.0 KiB
ArmAsm
99 lines
2.0 KiB
ArmAsm
;
|
|
; Christian Groessler, December 2000
|
|
;
|
|
; this file provides an equivalent to the BASIC GRAPHICS function
|
|
;
|
|
; void __fastcall__ graphics(unsigned char mode);
|
|
|
|
.export _graphics
|
|
.constructor initscrmem,28
|
|
|
|
.import __graphmode_used
|
|
|
|
.include "atari.inc"
|
|
|
|
.code
|
|
|
|
|
|
.proc _graphics
|
|
|
|
rts ; not implemented yet!
|
|
|
|
.endproc
|
|
|
|
|
|
; calc. upper memory limit to use
|
|
|
|
.proc initscrmem
|
|
|
|
lda __graphmode_used
|
|
beq ignore ; mode 0 doesn't need adjustment
|
|
cmp #32
|
|
bcs ignore ; invalid value
|
|
|
|
asl a
|
|
tay
|
|
lda APPMHI
|
|
sec
|
|
sbc grmemusage,y
|
|
sta APPMHI
|
|
lda APPMHI+1
|
|
sbc grmemusage+1,y
|
|
sta APPMHI+1
|
|
ignore: rts
|
|
|
|
.endproc
|
|
|
|
.rodata
|
|
|
|
; memory usage of the different graphics modes (0-31)
|
|
; values < 0 of "bytes needed" are mappped to 0
|
|
; bytes needed ; mode ; val. of MEMTOP
|
|
grmemusage:
|
|
.word 0 ; 0 ; 39967
|
|
.word 0 ;-318 ; 1 ; 40285
|
|
.word 0 ;-568 ; 2 ; 40535
|
|
.word 0 ;-558 ; 3 ; 40525
|
|
.word 0 ;-298 ; 4 ; 40265
|
|
.word 182 ; 5 ; 39785
|
|
.word 1182 ; 6 ; 38785
|
|
.word 3198 ; 7 ; 36769
|
|
.word 7120 ; 8 ; 32847
|
|
.word 7146 ; 9 ; 32821
|
|
.word 7146 ; 10 ; 32821
|
|
.word 7146 ; 11 ; 32821
|
|
.word 162 ; 12 ; 39805
|
|
.word 0 ;-328 ; 13 ; 40295
|
|
.word 3278 ; 14 ; 36689
|
|
.word 7120 ; 15 ; 32847
|
|
.word 0 ; 16 ; 39967
|
|
.word 0 ;-320 ; 17 ; 40287
|
|
.word 0 ;-572 ; 18 ; 40539
|
|
.word 0 ;-560 ; 19 ; 40527
|
|
.word 0 ;-296 ; 20 ; 40263
|
|
.word 184 ; 21 ; 39783
|
|
.word 1192 ; 22 ; 38775
|
|
.word 3208 ; 23 ; 36759
|
|
.word 7146 ; 24 ; 32821
|
|
.word 7146 ; 25 ; 32821
|
|
.word 7146 ; 26 ; 32821
|
|
.word 7146 ; 27 ; 32821
|
|
.word 160 ; 28 ; 39807
|
|
.word 0 ;-332 ; 29 ; 40299
|
|
.word 3304 ; 30 ; 36663
|
|
.word 7146 ; 31 ; 32821
|
|
|
|
; the program used to get these values (Atari BASIC):
|
|
; 100 FILE=0
|
|
; 110 IF FILE=1 THEN OPEN #1,8,0,"D:FREEMEM.OUT"
|
|
; 120 IF FILE<>1 THEN OPEN #1,8,0,"E:"
|
|
; 200 DIM G(32)
|
|
; 210 FOR I=0 TO 32:GRAPHICS I:GOSUB 1000:G(I)=VAL:NEXT I
|
|
; 220 GRAPHICS 0
|
|
; 230 FOR I=0 TO 31:PRINT #1;I;":",G(I);" - ";G(0)-G(I):NEXT I
|
|
; 240 CLOSE #1
|
|
; 999 END
|
|
; 1000 VAL=PEEK(741)+256*PEEK(742)
|
|
; 1010 RETURN
|
|
|