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_xres: .res 2 ; X resolution of the current mode
26 _tgi_yres: .res 2 ; Y resolution of the current mode
27 _tgi_colorcount:.res 1 ; Number of available colors
28 _tgi_pagecount: .res 1 ; Number of available screen pages
33 ; Jump table for the driver functions.
35 tgi_install: jmp $0000
36 tgi_deinstall: jmp $0000
39 tgi_control: jmp $0000
41 tgi_setviewpage:jmp $0000
42 tgi_setdrawpage:jmp $0000
43 tgi_setcolor: jmp $0000
44 tgi_setpixel: jmp $0000
45 tgi_getpixel: jmp $0000
51 ;----------------------------------------------------------------------------
52 ; void __fastcall__ tgi_setup (void);
53 ; /* Setup the driver and graphics kernel once the driver is loaded */
64 jsr tgi_set_ptr ; load _tgi_drv into ptr1
66 ; Copy the jump vectors
70 @L1: inx ; Skip JMP opcode
71 jsr copy ; Copy one byte
72 jsr copy ; Copy one byte
73 cpx #(TGI_HDR_JUMPCOUNT*3)
76 ; Check for emulation vectors needed
79 ora tgi_bar+2 ; Do we have a BAR vector?
81 lda #<tgi_emu_bar ; Use emulation if no
86 ; Copy variables. Beware: We are using internal knowledge about variable
89 @L2: ldy #TGI_HDR_XRES
98 ; Initialize variables
102 @L4: sta _tgi_error,x ; Clear error/mode/curx/cury
106 jsr tgi_install ; Call driver install routine
108 ; jmp tgi_fetch_error
110 ;----------------------------------------------------------------------------
111 ; Fetch the error code from the driver and place it into the global error
112 ; variable. The function will also return the error in A and the flags from
113 ; loading the error code are set.
122 ;----------------------------------------------------------------------------
123 ; Load the pointer to the tgi driver into ptr1.
132 ;----------------------------------------------------------------------------
133 ; Set an invalid argument error