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