mirror of
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.
452 lines
14 KiB
ArmAsm
452 lines
14 KiB
ArmAsm
;
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; Graphics driver for the 280x192x8 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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HBASL := $26
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HMASK := $30
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PAGE := $E6
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SCALE := $E7
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ROT := $F9
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; Graphics entry points, by cbmnut (applenut??) cbmnut@hushmail.com
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TEXT := $F399 ; Return to text screen
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HGR2 := $F3D8 ; Initialize and clear hi-res page 2.
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HGR := $F3E2 ; Initialize and clear hi-res page 1.
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HCLR := $F3F2 ; Clear the current hi-res screen to black.
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BKGND := $F3F6 ; Clear the current hi-res screen to the
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; last plotted color (from ($1C).
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HPOSN := $F411 ; Positions the hi-res cursor without
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; plotting a point.
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; Enter with (A) = Y-coordinate, and
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; (Y,X) = X-coordinate.
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HPLOT := $F457 ; Calls HPOSN and tries to plot a dot at
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; the cursor's position. If you are
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; trying to plot a non-white color at
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; a complementary color position, no
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; dot will be plotted.
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HLIN := $F53A ; Draws a line from the last plotted
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; point or line destination to:
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; (X,A) = X-coordinate, and
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; (Y) = Y-coordinate.
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HFIND := $F5CB ; Converts the hi-res coursor's position
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; back to X- and Y-coordinates; stores
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; X-coordinate at $E0,E1 and Y-coordinate
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; at $E2.
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DRAW := $F601 ; Draws a shape. Enter with (Y,X) = the
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; address of the shape table, and (A) =
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; the rotation factor. Uses the current
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; color.
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XDRAW := $F65D ; Draws a shape by inverting the existing
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; color of the dots the shape draws over.
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; Same entry parameters as DRAW.
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SETHCOL := $F6EC ; Set the hi-res color to (X), where (X)
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; must be between 0 and 7.
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; ------------------------------------------------------------------------
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; Variables mapped to the zero page segment variables. Some of these are
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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_hi_tgi
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.else
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module_header _a2_hi_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 280 ; X resolution
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.word 192 ; Y resolution
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.byte 8 ; Number of drawing colors
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pages: .byte 2 ; Number of screens available
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.byte 7 ; System font X size
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.byte 8 ; System font Y size
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.word $00EA ; 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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; Absolute variables used in the code
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ERROR: .res 1 ; Error code
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; ------------------------------------------------------------------------
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.rodata
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; Constants and tables
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DEFPALETTE: .byte $00, $01, $02, $03, $04, $05, $06, $07
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FONT:
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; Beagle Bros Shape Mechanic font F.ASCII.SMALL
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; modified to exactly reproduce the text glyphs
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.incbin "a2.hi.fnt"
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; ------------------------------------------------------------------------
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.code
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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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.ifdef __APPLE2ENH__
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; No page switching if 80 column store is enabled
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bit RD80COL
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bpl :+
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lda #$01
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sta pages
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: .endif
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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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rts
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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 MIXCLR
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bit HIRES
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bit TXTCLR
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; Beagle Bros Shape Mechanic fonts don't
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; scale well so use fixed scaling factor
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lda #$01
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sta SCALE
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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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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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; Switch into text mode
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bit TXTSET
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bit LOWSCR
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.ifdef __APPLE2ENH__
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; Limit SET80COL-HISCR to text
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bit LORES
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.endif
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; Reset the text window top
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lda #$00
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sta WNDTOP
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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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; 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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; Set text window top
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tax
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beq :+
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lda #20
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: sta WNDTOP
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; Switch 4 lines of text
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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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; 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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; 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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jsr HCLR
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bit $C080 ; Switch in LC bank 2 for R/O
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rts
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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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tax
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.assert LOWSCR + 1 = HISCR, error
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lda LOWSCR,x ; No BIT absolute,X available
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rts
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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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tax
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beq :+
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lda #>$4000 ; Page 2
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.byte $2C ; BIT absolute
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: lda #>$2000 ; Page 1
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sta PAGE
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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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jsr SETHCOL
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bit $C080 ; Switch in LC bank 2 for R/O
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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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ldx X1
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ldy X1+1
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lda Y1
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jsr HPLOT
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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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ldx X1
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ldy X1+1
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lda Y1
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jsr HPOSN
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lda (HBASL),y
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and HMASK
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asl
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beq :+ ; 0 (black)
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lda #$03 ; 3 (white)
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: bcc :+
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adc #$03 ; += 4 (black -> black2, white -> white2)
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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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; LINE: Draw a line from X1/Y1 to X2/Y2, where X1/Y1 = ptr1/ptr2 and
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; X2/Y2 = ptr3/ptr4 using the current drawing color.
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; Must set an error code: NO
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LINE:
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bit $C082 ; Switch in ROM
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ldx X1
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ldy X1+1
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lda Y1
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jsr HPOSN
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lda X2
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ldx X2+1
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ldy Y2
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jsr HLIN
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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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inc Y2
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: lda Y2
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pha
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lda Y1
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sta Y2
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jsr LINE
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pla
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sta Y2
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inc Y1
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cmp Y1
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bne :-
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rts
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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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cmp #TGI_TEXT_VERTICAL
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bne :+
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lda #48
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: sta ROT
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rts
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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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bit $C082 ; Switch in ROM
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lda X1
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ldy X1+1
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ldx ROT
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php ; Save Z flag
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beq :+ ; Not horizontal
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sec
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sbc #$07 ; Adjust X
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bcs :+
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dey
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: tax
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lda Y1
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plp ; Restore Z flag
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bne :+ ; Not vertical
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sec
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sbc #$07 ; Adjust Y
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: jsr HPOSN
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clc
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lda FONT+2*99 ; "connection char"
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adc #<FONT
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sta ptr4
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lda FONT+2*99+1 ; "connection char"
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adc #>FONT
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sta ptr4+1
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ldy #$00
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: lda (ptr3),y
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beq :+
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sty tmp1 ; Save string index
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sec
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sbc #$1F ; No control chars
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asl ; Offset * 2
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tay
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clc
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lda FONT,y
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adc #<FONT
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tax
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lda FONT+1,y
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adc #>FONT
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tay
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lda ROT
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jsr DRAW ; Draw char from string
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ldx ptr4
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ldy ptr4+1
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lda ROT
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jsr DRAW ; Draw "connection char"
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ldy tmp1 ; Restore string index
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iny
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bne :- ; Branch always
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: bit $C080 ; Switch in LC bank 2 for R/O
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rts
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