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193 lines
5.3 KiB
ArmAsm
193 lines
5.3 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 21.06.2002
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;
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; Common functions of the tgi graphics kernel.
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;
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.include "tgi-kernel.inc"
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.include "tgi-error.inc"
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.export tgi_clear_ptr
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.importzp ptr1
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;----------------------------------------------------------------------------
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; Variables
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.bss
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_tgi_drv: .res 2 ; Pointer to driver
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_tgi_error: .res 1 ; Last error code
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_tgi_gmode: .res 1 ; Flag: Graphics mode active
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_tgi_curx: .res 2 ; Current drawing cursor X
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_tgi_cury: .res 2 ; Current drawing cursor Y
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_tgi_color: .res 1 ; Current drawing color
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_tgi_textdir: .res 1 ; Current text direction
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_tgi_textmagx: .res 1 ; Text magnification in X dir
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_tgi_textmagy: .res 1 ; Text magnification in Y dir
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; The following variables are copied from the driver header for faster access
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tgi_driver_vars:
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_tgi_xres: .res 2 ; X resolution of the current mode
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_tgi_yres: .res 2 ; Y resolution of the current mode
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_tgi_colorcount: .res 1 ; Number of available colors
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_tgi_pagecount: .res 1 ; Number of available screen pages
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_tgi_fontsizex: .res 1 ; System font X size
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_tgi_fontsizey: .res 1 ; System font Y size
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tgi_driver_var_size = * - tgi_driver_vars
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.data
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; Jump table for the driver functions.
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tgi_install: jmp $0000
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tgi_uninstall: jmp $0000
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tgi_init: jmp $0000
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tgi_done: jmp $0000
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tgi_geterror: jmp $0000
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tgi_control: jmp $0000
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tgi_clear: jmp $0000
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tgi_setviewpage: jmp $0000
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tgi_setdrawpage: jmp $0000
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tgi_setcolor: jmp $0000
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tgi_setpalette: jmp $0000
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tgi_getpalette: jmp $0000
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tgi_getdefpalette: jmp $0000
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tgi_setpixel: jmp $0000
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tgi_getpixel: jmp $0000
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tgi_horline: jmp $0000
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tgi_line: jmp $0000
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tgi_bar: jmp $0000
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tgi_circle: jmp $0000
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tgi_textstyle: jmp $0000
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tgi_outtext: jmp $0000
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; Driver header signature
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.rodata
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tgi_sig: .byte $74, $67, $69, TGI_API_VERSION ; "tgi", version
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tgi_sig_len = * - tgi_sig
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;----------------------------------------------------------------------------
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; void __fastcall__ tgi_install (void* driver);
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; /* Install an already loaded driver. */
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_tgi_install:
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sta _tgi_drv
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sta ptr1
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stx _tgi_drv+1
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stx ptr1+1
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; Check the driver signature
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ldy #tgi_sig_len-1
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@L0: lda (ptr1),y
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cmp tgi_sig,y
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bne tgi_inv_drv
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dey
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bpl @L0
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; Copy the jump vectors
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ldy #TGI_HDR_JUMPTAB
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ldx #0
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@L1: inx ; Skip JMP opcode
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jsr copy ; Copy one byte
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jsr copy ; Copy one byte
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cpx #(TGI_HDR_JUMPCOUNT*3)
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bne @L1
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; Check for emulation vectors needed
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lda tgi_bar+1
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ora tgi_bar+2 ; Do we have a BAR vector?
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bne @L2 ; Jump if yes
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lda #<tgi_emu_bar ; Use emulation if no
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sta tgi_bar+1
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lda #>tgi_emu_bar
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sta tgi_bar+2
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@L2: jsr tgi_install ; Call driver install routine, may...
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; ...update variables
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jsr tgi_set_ptr ; Set ptr1 to tgi_drv
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; Copy variables. Beware: We are using internal knowledge about variable
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; layout here!
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ldy #TGI_HDR_XRES
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ldx #0
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@L3: lda (ptr1),y
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sta tgi_driver_vars,x
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iny
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inx
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cpx #tgi_driver_var_size
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bne @L3
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; Initialize variables
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lda #$00
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ldx #7-1
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@L4: sta _tgi_error,x ; Clear error/mode/curx/cury/textdir
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dex
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bpl @L4
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rts
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; Copy one byte from the jump vectors
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copy: lda (ptr1),y
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sta tgi_install,x
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iny
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inx
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rts
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;----------------------------------------------------------------------------
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; Set an invalid argument error
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tgi_inv_arg:
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lda #TGI_ERR_INV_ARG
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sta _tgi_error
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rts
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;----------------------------------------------------------------------------
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; Set an invalid driver error
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tgi_inv_drv:
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lda #TGI_ERR_INV_DRIVER
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sta _tgi_error
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rts
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;----------------------------------------------------------------------------
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; Load the pointer to the tgi driver into ptr1.
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tgi_set_ptr:
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lda _tgi_drv
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sta ptr1
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lda _tgi_drv+1
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sta ptr1+1
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rts
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;----------------------------------------------------------------------------
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; void __fastcall__ tgi_uninstall (void);
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; /* Uninstall the currently loaded driver but do not unload it. Will call
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; * tgi_done if necessary.
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; */
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_tgi_uninstall:
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jsr _tgi_done ; Switch off graphics
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jsr tgi_uninstall ; Allow the driver to clean up
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; Clear driver pointer and error code
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tgi_clear_ptr: ; External entry point
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lda #$00
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sta _tgi_drv
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sta _tgi_drv+1
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sta _tgi_error
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rts
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