2 ; Ullrich von Bassewitz, 21.06.2002
4 ; Common functions of the tgi graphics kernel.
7 .include "tgi-kernel.inc"
8 .include "tgi-error.inc"
14 ;----------------------------------------------------------------------------
19 _tgi_drv: .res 2 ; Pointer to driver
20 _tgi_error: .res 1 ; Last error code
21 _tgi_mode: .res 1 ; Graphics mode or zero
22 _tgi_curx: .res 2 ; Current drawing cursor X
23 _tgi_cury: .res 2 ; Current drawing cursor Y
24 _tgi_color: .res 1 ; Current drawing color
25 _tgi_textdir: .res 1 ; Current text direction
26 _tgi_textmagx: .res 1 ; Text magnification in X dir
27 _tgi_textmagy: .res 1 ; Text magnification in Y dir
29 ; The following variables are copied from the driver header for faster access
31 _tgi_xres: .res 2 ; X resolution of the current mode
32 _tgi_yres: .res 2 ; Y resolution of the current mode
33 _tgi_colorcount: .res 1 ; Number of available colors
34 _tgi_pagecount: .res 1 ; Number of available screen pages
35 _tgi_fontsizex: .res 1 ; System font X size
36 _tgi_fontsizey: .res 1 ; System font Y size
37 tgi_driver_var_size = * - tgi_driver_vars
42 ; Jump table for the driver functions.
44 tgi_install: jmp $0000
45 tgi_deinstall: jmp $0000
48 tgi_geterror: jmp $0000
49 tgi_control: jmp $0000
51 tgi_setviewpage: jmp $0000
52 tgi_setdrawpage: jmp $0000
53 tgi_setcolor: jmp $0000
54 tgi_setpalette: jmp $0000
55 tgi_getpalette: jmp $0000
56 tgi_getdefpalette: jmp $0000
57 tgi_setpixel: jmp $0000
58 tgi_getpixel: jmp $0000
59 tgi_horline: jmp $0000
63 tgi_textstyle: jmp $0000
64 tgi_outtext: jmp $0000
67 ;----------------------------------------------------------------------------
68 ; void __fastcall__ tgi_setup (void);
69 ; /* Setup the driver and graphics kernel once the driver is loaded */
80 jsr tgi_set_ptr ; load _tgi_drv into ptr1
82 ; Copy the jump vectors
86 @L1: inx ; Skip JMP opcode
87 jsr copy ; Copy one byte
88 jsr copy ; Copy one byte
89 cpx #(TGI_HDR_JUMPCOUNT*3)
92 ; Check for emulation vectors needed
95 ora tgi_bar+2 ; Do we have a BAR vector?
97 lda #<tgi_emu_bar ; Use emulation if no
106 jsr tgi_install ; Call driver install routine
107 pla ; (may update variables)
108 sta ptr1+1 ; (may modify ptr1 so it is preserved)
112 ; Copy variables. Beware: We are using internal knowledge about variable
118 sta tgi_driver_vars,x
121 cpx #tgi_driver_var_size
124 ; Initialize variables
128 @L4: sta _tgi_error,x ; Clear error/mode/curx/cury/textdir
134 ;----------------------------------------------------------------------------
135 ; Load the pointer to the tgi driver into ptr1.
144 ;----------------------------------------------------------------------------
145 ; Set an invalid argument error