mirror of
https://github.com/cc65/cc65.git
synced 2024-11-18 00:07:21 +00:00
52 lines
798 B
ArmAsm
52 lines
798 B
ArmAsm
;
|
|
; Christian Groessler, June 2000
|
|
;
|
|
; this file provides a setcolor() function similar to BASIC SETCOLOR
|
|
;
|
|
; void __fastcall__ setcolor (unsigned char color_reg, unsigned char hue, unsigned char luminace);
|
|
; void __fastcall__ setcolor_low (unsigned char color_reg, unsigned char color_value);
|
|
; unsigned char __fastcall__ getcolor (unsigned char color_reg);
|
|
;
|
|
|
|
|
|
.export _setcolor, _setcolor_low, _getcolor
|
|
.import popa
|
|
.include "atari.inc"
|
|
|
|
.proc _getcolor
|
|
|
|
tax
|
|
lda COLOR0,x ; get current value
|
|
ldx #0
|
|
rts
|
|
|
|
.endproc
|
|
|
|
.proc _setcolor
|
|
|
|
; asl a ; not -> BASIC compatible
|
|
sta lum ; remember luminance
|
|
jsr popa ; get hue
|
|
asl a
|
|
asl a
|
|
asl a
|
|
asl a
|
|
ora lum
|
|
; jmp _setcolor_low
|
|
|
|
.endproc
|
|
|
|
.proc _setcolor_low
|
|
|
|
pha
|
|
jsr popa
|
|
tax
|
|
pla
|
|
sta COLOR0,x
|
|
rts
|
|
|
|
.endproc
|
|
|
|
.bss
|
|
lum: .res 1
|