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e319fc217b
when needed. The variables make signed compares in the line clipper easier. git-svn-id: svn://svn.cc65.org/cc65/trunk@4450 b7a2c559-68d2-44c3-8de9-860c34a00d81
81 lines
2.0 KiB
ArmAsm
81 lines
2.0 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 21.06.2002
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;
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; void __fastcall__ tgi_init (void);
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; /* Initialize the already loaded graphics driver */
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.include "tgi-kernel.inc"
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.include "tgi-error.inc"
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.import pushax, pusha, decax1
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.importzp ptr1
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;----------------------------------------------------------------------------
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.code
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.proc _tgi_init
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jsr _tgi_done ; Switch off graphics if needed
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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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inc _tgi_gmode ; Remember that graph mode is active
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; Get the maximum X and Y coordinate
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jsr _tgi_getxres
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jsr decax1
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sta _tgi_xmax
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stx _tgi_xmax+1
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jsr _tgi_getyres
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jsr decax1
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sta _tgi_ymax
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stx _tgi_ymax+1
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; Do driver initialization. Set draw and view pages.
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lda #0
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jsr tgi_setviewpage
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lda #0
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jsr tgi_setdrawpage
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; 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 ; Save it
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jsr tgi_setpalette ; Set the default palette.
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jsr tgi_geterror ; Clear a possible error code
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; Set the drawing color to white
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@L1: lda #TGI_COLOR_WHITE
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jsr _tgi_setcolor ; tgi_setcolor (TGI_COLOR_WHITE);
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; Set the text style
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lda #<$100
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ldx #>$100
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jsr pushax ; Width scale
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jsr pushax ; Heigh scale
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jsr pusha ; Text direction = TGI_TEXT_VERTICAL
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jsr _tgi_textstyle ; A = Font = TGI_FONT_BITMAP
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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: rts
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.endproc
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