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https://github.com/cc65/cc65.git
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dacee3b9ed
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.
354 lines
11 KiB
ArmAsm
354 lines
11 KiB
ArmAsm
;
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; Graphics driver for the 40x48x16 mode on the Apple II
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;
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; Stefan Haubenthal <polluks@sdf.lonestar.org>
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; Oliver Schmidt <ol.sc@web.de>
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;
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.include "zeropage.inc"
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.include "tgi-kernel.inc"
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.include "tgi-error.inc"
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.include "apple2.inc"
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.macpack module
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; ------------------------------------------------------------------------
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; Zero page stuff
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H2 := $2C
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COLOR := $30
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; ROM entry points
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TEXT := $F399
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PLOT := $F800
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HLINE := $F819
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CLRSC2 := $F838
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SETCOL := $F864
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SCRN := $F871
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SETGR := $FB40
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HOME := $FC58
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; Used for passing parameters to the driver
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X1 := ptr1
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Y1 := ptr2
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X2 := ptr3
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Y2 := ptr4
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; ------------------------------------------------------------------------
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.ifdef __APPLE2ENH__
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module_header _a2e_lo_tgi
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.else
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module_header _a2_lo_tgi
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.endif
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; Header. Includes jump table and constants.
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; First part of the header is a structure that has a magic and defines the
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; capabilities of the driver
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.byte $74, $67, $69 ; "tgi"
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.byte TGI_API_VERSION ; TGI API version number
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.addr $0000 ; Library reference
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.word 40 ; X resolution
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.word 48 ; Y resolution
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.byte 16 ; Number of drawing colors
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.byte 1 ; Number of screens available
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.byte 8 ; System font X size
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.byte 8 ; System font Y size
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.word $0198 ; Aspect ratio (based on 4/3 display)
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.byte 0 ; TGI driver flags
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; Next comes the jump table. With the exception of IRQ, all entries must be
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; valid and may point to an RTS for test versions (function not implemented).
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.addr INSTALL
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.addr UNINSTALL
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.addr INIT
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.addr DONE
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.addr GETERROR
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.addr CONTROL
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.addr CLEAR
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.addr SETVIEWPAGE
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.addr SETDRAWPAGE
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.addr SETCOLOR
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.addr SETPALETTE
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.addr GETPALETTE
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.addr GETDEFPALETTE
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.addr SETPIXEL
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.addr GETPIXEL
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.addr LINE
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.addr BAR
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.addr TEXTSTYLE
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.addr OUTTEXT
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; ------------------------------------------------------------------------
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.bss
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ERROR: .res 1 ; Error code
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MIX: .res 1 ; 4 lines of text
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; ------------------------------------------------------------------------
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.rodata
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DEFPALETTE: .byte $00, $01, $02, $03, $04, $05, $06, $07
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.byte $08, $09, $0A, $0B, $0C, $0D, $0E, $0F
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TGI2COL: .byte $00, $0C, $03, $0F, $01, $09, $06, $02
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.byte $04, $05, $07, $08, $0A, $0B, $0D, $0E
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COL2TGI: .byte $00, $04, $07, $02, $08, $09, $06, $0A
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.byte $0B, $05, $0C, $0D, $01, $0E, $0F, $03
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MAXY: .byte 47, 39
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; ------------------------------------------------------------------------
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.code
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; INIT: Changes an already installed device from text mode to graphics mode.
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; Note that INIT/DONE may be called multiple times while the driver
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; is loaded, while INSTALL is only called once, so any code that is needed
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; to initializes variables and so on must go here. Setting palette and
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; clearing the screen is not needed because this is called by the graphics
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; kernel later.
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; The graphics kernel will never call INIT when a graphics mode is already
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; active, so there is no need to protect against that.
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; Must set an error code: YES
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INIT:
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; Switch into graphics mode
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bit $C082 ; Switch in ROM
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jsr SETGR
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bit MIXCLR
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bit $C080 ; Switch in LC bank 2 for R/O
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; Done, reset the error code
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lda #TGI_ERR_OK
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sta ERROR
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sta MIX
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; Fall through
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; INSTALL routine. Is called after the driver is loaded into memory. May
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; initialize anything that has to be done just once. Is probably empty
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; most of the time.
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; Must set an error code: NO
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INSTALL:
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; Fall through
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; UNINSTALL routine. Is called before the driver is removed from memory. May
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; clean up anything done by INSTALL but is probably empty most of the time.
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; Must set an error code: NO
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UNINSTALL:
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; Fall through
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; SETVIEWPAGE: Set the visible page. Called with the new page in A (0..n).
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; The page number is already checked to be valid by the graphics kernel.
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; Must set an error code: NO (will only be called if page ok)
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SETVIEWPAGE:
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; Fall through
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; SETDRAWPAGE: Set the drawable page. Called with the new page in A (0..n).
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; The page number is already checked to be valid by the graphics kernel.
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; Must set an error code: NO (will only be called if page ok)
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SETDRAWPAGE:
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; Fall through
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; TEXTSTYLE: Set the style used when calling OUTTEXT. Text scaling in X and Y
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; direction is passend in X/Y, the text direction is passed in A.
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; Must set an error code: NO
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TEXTSTYLE:
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; Fall through
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; OUTTEXT: Output text at X/Y = ptr1/ptr2 using the current color and the
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; current text style. The text to output is given as a zero terminated
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; string with address in ptr3.
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; Must set an error code: NO
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OUTTEXT:
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rts
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; DONE: Will be called to switch the graphics device back into text mode.
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; The graphics kernel will never call DONE when no graphics mode is active,
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; so there is no need to protect against that.
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; Must set an error code: NO
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DONE:
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bit $C082 ; Switch in ROM
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jsr TEXT
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jsr HOME
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bit $C080 ; Switch in LC bank 2 for R/O
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rts
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; GETERROR: Return the error code in A and clear it.
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GETERROR:
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lda ERROR
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ldx #TGI_ERR_OK
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stx ERROR
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rts
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; CLEAR: Clears the screen.
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; Must set an error code: NO
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CLEAR:
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bit $C082 ; Switch in ROM
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lda COLOR ; Save current drawing color
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pha
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ldx MIX
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ldy MAXY,x ; Max Y depends on 4 lines of text
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jsr CLRSC2
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pla
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sta COLOR ; Restore current drawing color
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bit $C080 ; Switch in LC bank 2 for R/O
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rts
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; SETCOLOR: Set the drawing color (in A). The new color is already checked
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; to be in a valid range (0..maxcolor-1).
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; Must set an error code: NO (will only be called if color ok)
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SETCOLOR:
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bit $C082 ; Switch in ROM
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tax
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lda TGI2COL,x
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jsr SETCOL
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bit $C080 ; Switch in LC bank 2 for R/O
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rts
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; CONTROL: Platform/driver specific entry point.
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; Must set an error code: YES
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CONTROL:
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; Check data msb and code to be 0
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ora ptr1+1
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bne err
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; Check data lsb to be [0..1]
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lda ptr1
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cmp #1+1
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bcs err
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bit $C082 ; Switch in ROM
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; Switch 4 lines of text
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tax
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.assert MIXCLR + 1 = MIXSET, error
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lda MIXCLR,x ; No BIT absolute,X available
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; Save current switch setting
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txa
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sta MIX
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bne text
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; Clear 8 lines of graphics
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lda COLOR ; Save current drawing color
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pha
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lda #39 ; Rightmost column
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sta H2
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ldx #40 ; First line
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: txa
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ldy #$00 ; Leftmost column
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sty COLOR ; Black
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jsr HLINE ; Preserves X
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inx
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cpx #47+1 ; Last line
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bcc :-
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pla
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sta COLOR ; Restore current drawing color
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bcs :+ ; Branch always
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; Clear 4 lines of text
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text: jsr HOME
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: bit $C080 ; Switch in LC bank 2 for R/O
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; Done, reset the error code
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lda #TGI_ERR_OK
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beq :+ ; Branch always
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; Done, set the error code
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err: lda #TGI_ERR_INV_ARG
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: sta ERROR
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rts
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; SETPALETTE: Set the palette (not available with all drivers/hardware).
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; A pointer to the palette is passed in ptr1. Must set an error if palettes
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; are not supported
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; Must set an error code: YES
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SETPALETTE:
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lda #TGI_ERR_INV_FUNC
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sta ERROR
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rts
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; GETPALETTE: Return the current palette in A/X. Even drivers that cannot
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; set the palette should return the default palette here, so there's no
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; way for this function to fail.
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; Must set an error code: NO
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GETPALETTE:
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; Fall through
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; GETDEFPALETTE: Return the default palette for the driver in A/X. All
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; drivers should return something reasonable here, even drivers that don't
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; support palettes, otherwise the caller has no way to determine the colors
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; of the (not changeable) palette.
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; Must set an error code: NO (all drivers must have a default palette)
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GETDEFPALETTE:
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lda #<DEFPALETTE
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ldx #>DEFPALETTE
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rts
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; SETPIXEL: Draw one pixel at X1/Y1 = ptr1/ptr2 with the current drawing
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; color. The coordinates passed to this function are never outside the
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; visible screen area, so there is no need for clipping inside this function.
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; Must set an error code: NO
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SETPIXEL:
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bit $C082 ; Switch in ROM
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ldy X1
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lda Y1
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jsr PLOT
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bit $C080 ; Switch in LC bank 2 for R/O
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rts
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; GETPIXEL: Read the color value of a pixel and return it in A/X. The
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; coordinates passed to this function are never outside the visible screen
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; area, so there is no need for clipping inside this function.
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GETPIXEL:
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bit $C082 ; Switch in ROM
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ldy X1
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lda Y1
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jsr SCRN
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tax
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lda COL2TGI,x
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ldx #$00
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bit $C080 ; Switch in LC bank 2 for R/O
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rts
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; BAR: Draw a filled rectangle with the corners X1/Y1, X2/Y2, where
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; X1/Y1 = ptr1/ptr2 and X2/Y2 = ptr3/ptr4 using the current drawing color.
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; Contrary to most other functions, the graphics kernel will sort and clip
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; the coordinates before calling the driver, so on entry the following
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; conditions are valid:
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; X1 <= X2
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; Y1 <= Y2
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; (X1 >= 0) && (X1 < XRES)
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; (X2 >= 0) && (X2 < XRES)
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; (Y1 >= 0) && (Y1 < YRES)
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; (Y2 >= 0) && (Y2 < YRES)
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; Must set an error code: NO
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BAR:
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bit $C082 ; Switch in ROM
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lda X2
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sta H2
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inc Y2
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ldx Y1
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: txa
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ldy X1
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jsr HLINE ; Preserves X
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inx
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cpx Y2
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bcc :-
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bit $C080 ; Switch in LC bank 2 for R/O
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rts
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; ------------------------------------------------------------------------
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.include "../../tgi/tgidrv_line.inc"
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