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53 lines
1.5 KiB
ArmAsm
53 lines
1.5 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 21.06.2002
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;
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; void __fastcall__ tgi_init (unsigned char mode);
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; /* Initialize the given graphics mode. */
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.include "tgi-kernel.inc"
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.include "tgi-error.inc"
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.importzp ptr1
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.import _tgi_done
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.import _tgi_setcolor
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.export _tgi_init
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_tgi_init:
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pha ; Save mode
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jsr _tgi_done ; Switch off graphics if needed
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pla
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sta _tgi_mode ; Remember the mode
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jsr tgi_init ; Go into graphics mode
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jsr tgi_geterror ; Get the error code
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sta _tgi_error ; Save for later reference
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cmp #TGI_ERR_OK
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bne @L9 ; Jump on error
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; Do driver initialization. First set the default palette.
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jsr tgi_getdefpalette ; Get the default palette into A/X
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sta ptr1
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stx ptr1+1
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ora ptr1+1 ; Do we have a default palette?
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beq @L1 ; Jump if no
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jsr tgi_setpalette ; Set the default palette
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; Set the drawing color to the maximum color
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@L1: ldx _tgi_colorcount
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dex
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txa
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jsr _tgi_setcolor ; tgi_setcolor (tgi_getmaxcolor ());
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; Clear the screen
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jmp tgi_clear
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; Error exit
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@L9: lda #$00
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sta _tgi_mode ; Clear the mode if init was not successful
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rts
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