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All but one TGI drivers didn't use IRQs. Especially when the TGI driver kernel was the only .interruptor this meant quite some unnecessary overhead because it pulled in the whole IRQ infrastructure. The one driver using IRQs (the graphics driver for the 160x102x16 mode on the Lynx) now uses a library reference to set up a JMP to its IRQ handler.
209 lines
6.1 KiB
ArmAsm
209 lines
6.1 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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.import tgi_libref
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.importzp ptr1
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.include "tgi-kernel.inc"
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.include "tgi-error.inc"
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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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; From here on, variables get cleared when a new driver is loaded
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cstart:
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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_font: .res 1 ; Which font to use
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_tgi_textdir: .res 1 ; Current text direction
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_tgi_vectorfont: .res 2 ; Pointer to vector font
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; The following are character scale/size variables in 8.8 fixed point
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; format. They are required to be in this order and adjacent.
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_tgi_textscalew: .res 2 ; Vector font width scale
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.res 2 ; Bitmap font width scale
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_tgi_charwidth: .res 2 ; Full width of one bitmap char
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_tgi_textscaleh: .res 2 ; Vector font height scale
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.res 2 ; Bitmap font height scale
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_tgi_charheight: .res 2 ; Full height of one bitmap char
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; End of section that gets cleared when a new driver is loaded
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csize = * - cstart
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; Maximum X and Y coordinate (that is, xres-1 and yres-1)
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_tgi_xmax: .res 2
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_tgi_ymax: .res 2
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; The following variables are copied from the driver header for faster access.
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; fontwidth and fontheight are expected to be in order and adjacent.
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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_fontwidth: .res 1 ; System font width in pixels
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_tgi_fontheight: .res 1 ; System font height in pixels
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_tgi_aspectratio: .res 2 ; Aspect ratio in 8.8 fixed point
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_tgi_flags: .res 1 ; TGI driver flags
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.data
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; Jump table for the driver functions.
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jumpvectors:
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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_line: jmp $0000
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tgi_bar: 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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.code
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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 #.sizeof(tgi_sig)-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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; Set the library reference
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ldy #TGI_HDR::LIBREF
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lda #<tgi_libref
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sta (ptr1),y
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iny
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lda #>tgi_libref
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sta (ptr1),y
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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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cpy #(TGI_HDR::JUMPTAB + .sizeof(TGI_HDR::JUMPTAB))
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bne @L1
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; Call the driver install routine. It may update header variables, so we copy
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; them after this call.
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jsr tgi_install
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; Copy variables from the driver header for faster access.
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jsr tgi_set_ptr ; Set ptr1 to tgi_drv
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ldy #(TGI_HDR::VARS + .sizeof(TGI_HDR::VARS) - 1)
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ldx #.sizeof(TGI_HDR::VARS)-1
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@L3: lda (ptr1),y
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sta tgi_driver_vars,x
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dey
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dex
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bpl @L3
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; Initialize some other variables
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lda #$00
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ldx #csize-1
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@L4: sta cstart,x ; Clear error/mode/curx/cury/...
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dex
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bpl @L4
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rts
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; Copy one byte to the jump vectors
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copy: lda (ptr1),y
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sta jumpvectors,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 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:
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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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