mirror of
https://github.com/cc65/cc65.git
synced 2024-12-28 06:30:16 +00:00
348 lines
8.7 KiB
ArmAsm
348 lines
8.7 KiB
ArmAsm
;
|
|
; Graphics driver for the 40x48x16 mode on the Apple II
|
|
;
|
|
; Stefan Haubenthal <polluks@sdf.lonestar.org>
|
|
; Oliver Schmidt <ol.sc@web.de>
|
|
;
|
|
|
|
.include "zeropage.inc"
|
|
|
|
.include "tgi-kernel.inc"
|
|
.include "tgi-mode.inc"
|
|
.include "tgi-error.inc"
|
|
.include "apple2.inc"
|
|
|
|
; ------------------------------------------------------------------------
|
|
|
|
; Zero page stuff
|
|
|
|
H2 := $2C
|
|
COLOR := $30
|
|
|
|
; ROM entry points
|
|
|
|
TEXT := $F399
|
|
PLOT := $F800
|
|
HLINE := $F819
|
|
CLRSC2 := $F838
|
|
SETCOL := $F864
|
|
SCRN := $F871
|
|
SETGR := $FB40
|
|
HOME := $FC58
|
|
|
|
; Used for passing parameters to the driver
|
|
|
|
X1 := ptr1
|
|
Y1 := ptr2
|
|
X2 := ptr3
|
|
Y2 := ptr4
|
|
|
|
; ------------------------------------------------------------------------
|
|
|
|
.segment "JUMPTABLE"
|
|
|
|
; Header. Includes jump table and constants.
|
|
|
|
; First part of the header is a structure that has a magic and defines the
|
|
; capabilities of the driver
|
|
|
|
.byte $74, $67, $69 ; "tgi"
|
|
.byte TGI_API_VERSION ; TGI API version number
|
|
.word 40 ; X resolution
|
|
.word 48 ; Y resolution
|
|
.byte 16 ; Number of drawing colors
|
|
.byte 1 ; Number of screens available
|
|
.byte 8 ; System font X size
|
|
.byte 8 ; System font Y size
|
|
.word $0198 ; Aspect ratio (based on 4/3 display)
|
|
|
|
; Next comes the jump table. With the exception of IRQ, all entries must be
|
|
; valid and may point to an RTS for test versions (function not implemented).
|
|
|
|
.addr INSTALL
|
|
.addr UNINSTALL
|
|
.addr INIT
|
|
.addr DONE
|
|
.addr GETERROR
|
|
.addr CONTROL
|
|
.addr CLEAR
|
|
.addr SETVIEWPAGE
|
|
.addr SETDRAWPAGE
|
|
.addr SETCOLOR
|
|
.addr SETPALETTE
|
|
.addr GETPALETTE
|
|
.addr GETDEFPALETTE
|
|
.addr SETPIXEL
|
|
.addr GETPIXEL
|
|
.addr LINE
|
|
.addr BAR
|
|
.addr TEXTSTYLE
|
|
.addr OUTTEXT
|
|
.addr 0 ; IRQ entry is unused
|
|
|
|
; ------------------------------------------------------------------------
|
|
|
|
.bss
|
|
|
|
ERROR: .res 1 ; Error code
|
|
MIX: .res 1 ; 4 lines of text
|
|
|
|
; ------------------------------------------------------------------------
|
|
|
|
.rodata
|
|
|
|
DEFPALETTE: .byte $00, $01, $02, $03, $04, $05, $06, $07
|
|
.byte $08, $09, $0A, $0B, $0C, $0D, $0E, $0F
|
|
|
|
TGI2COL: .byte $00, $0C, $03, $0F, $01, $09, $06, $02
|
|
.byte $04, $05, $07, $08, $0A, $0B, $0D, $0E
|
|
|
|
COL2TGI: .byte $00, $04, $07, $02, $08, $09, $06, $0A
|
|
.byte $0B, $05, $0C, $0D, $01, $0E, $0F, $03
|
|
|
|
MAXY: .byte 47, 39
|
|
|
|
; ------------------------------------------------------------------------
|
|
|
|
.code
|
|
|
|
; INIT: Changes an already installed device from text mode to graphics mode.
|
|
; Note that INIT/DONE may be called multiple times while the driver
|
|
; is loaded, while INSTALL is only called once, so any code that is needed
|
|
; to initializes variables and so on must go here. Setting palette and
|
|
; clearing the screen is not needed because this is called by the graphics
|
|
; kernel later.
|
|
; The graphics kernel will never call INIT when a graphics mode is already
|
|
; active, so there is no need to protect against that.
|
|
; Must set an error code: YES
|
|
INIT:
|
|
; Switch into graphics mode
|
|
bit $C082 ; Switch in ROM
|
|
jsr SETGR
|
|
bit MIXCLR
|
|
bit $C080 ; Switch in LC bank 2 for R/O
|
|
|
|
; Done, reset the error code
|
|
lda #TGI_ERR_OK
|
|
sta ERROR
|
|
sta MIX
|
|
|
|
; Fall through
|
|
|
|
; INSTALL routine. Is called after the driver is loaded into memory. May
|
|
; initialize anything that has to be done just once. Is probably empty
|
|
; most of the time.
|
|
; Must set an error code: NO
|
|
INSTALL:
|
|
; Fall through
|
|
|
|
; UNINSTALL routine. Is called before the driver is removed from memory. May
|
|
; clean up anything done by INSTALL but is probably empty most of the time.
|
|
; Must set an error code: NO
|
|
UNINSTALL:
|
|
; Fall through
|
|
|
|
; SETVIEWPAGE: Set the visible page. Called with the new page in A (0..n).
|
|
; The page number is already checked to be valid by the graphics kernel.
|
|
; Must set an error code: NO (will only be called if page ok)
|
|
SETVIEWPAGE:
|
|
; Fall through
|
|
|
|
; SETDRAWPAGE: Set the drawable page. Called with the new page in A (0..n).
|
|
; The page number is already checked to be valid by the graphics kernel.
|
|
; Must set an error code: NO (will only be called if page ok)
|
|
SETDRAWPAGE:
|
|
; Fall through
|
|
|
|
; TEXTSTYLE: Set the style used when calling OUTTEXT. Text scaling in X and Y
|
|
; direction is passend in X/Y, the text direction is passed in A.
|
|
; Must set an error code: NO
|
|
TEXTSTYLE:
|
|
; Fall through
|
|
|
|
; OUTTEXT: Output text at X/Y = ptr1/ptr2 using the current color and the
|
|
; current text style. The text to output is given as a zero terminated
|
|
; string with address in ptr3.
|
|
; Must set an error code: NO
|
|
OUTTEXT:
|
|
rts
|
|
|
|
; DONE: Will be called to switch the graphics device back into text mode.
|
|
; The graphics kernel will never call DONE when no graphics mode is active,
|
|
; so there is no need to protect against that.
|
|
; Must set an error code: NO
|
|
DONE:
|
|
bit $C082 ; Switch in ROM
|
|
jsr TEXT
|
|
jsr HOME
|
|
bit $C080 ; Switch in LC bank 2 for R/O
|
|
rts
|
|
|
|
; GETERROR: Return the error code in A and clear it.
|
|
GETERROR:
|
|
lda ERROR
|
|
ldx #TGI_ERR_OK
|
|
stx ERROR
|
|
rts
|
|
|
|
; CLEAR: Clears the screen.
|
|
; Must set an error code: NO
|
|
CLEAR:
|
|
bit $C082 ; Switch in ROM
|
|
lda COLOR ; Save current drawing color
|
|
pha
|
|
ldx MIX
|
|
ldy MAXY,x ; Max Y depends on 4 lines of text
|
|
jsr CLRSC2
|
|
pla
|
|
sta COLOR ; Restore current drawing color
|
|
bit $C080 ; Switch in LC bank 2 for R/O
|
|
rts
|
|
|
|
; SETCOLOR: Set the drawing color (in A). The new color is already checked
|
|
; to be in a valid range (0..maxcolor-1).
|
|
; Must set an error code: NO (will only be called if color ok)
|
|
SETCOLOR:
|
|
bit $C082 ; Switch in ROM
|
|
tax
|
|
lda TGI2COL,x
|
|
jsr SETCOL
|
|
bit $C080 ; Switch in LC bank 2 for R/O
|
|
rts
|
|
|
|
; CONTROL: Platform/driver specific entry point.
|
|
; Must set an error code: YES
|
|
CONTROL:
|
|
; Check data msb and code to be 0
|
|
ora ptr1+1
|
|
bne err
|
|
|
|
; Check data lsb to be [0..1]
|
|
lda ptr1
|
|
cmp #1+1
|
|
bcs err
|
|
bit $C082 ; Switch in ROM
|
|
|
|
; Switch 4 lines of text
|
|
tax
|
|
.assert MIXCLR + 1 = MIXSET, error
|
|
lda MIXCLR,x ; No BIT absolute,X available
|
|
|
|
; Save current switch setting
|
|
txa
|
|
sta MIX
|
|
bne text
|
|
|
|
; Clear 8 lines of graphics
|
|
lda COLOR ; Save current drawing color
|
|
pha
|
|
lda #39 ; Rightmost column
|
|
sta H2
|
|
ldx #40 ; First line
|
|
: txa
|
|
ldy #$00 ; Leftmost column
|
|
sty COLOR ; Black
|
|
jsr HLINE ; Preserves X
|
|
inx
|
|
cpx #47+1 ; Last line
|
|
bcc :-
|
|
pla
|
|
sta COLOR ; Restore current drawing color
|
|
bcs :+ ; Branch always
|
|
|
|
; Clear 4 lines of text
|
|
text: jsr HOME
|
|
: bit $C080 ; Switch in LC bank 2 for R/O
|
|
|
|
; Done, reset the error code
|
|
lda #TGI_ERR_OK
|
|
beq :+ ; Branch always
|
|
|
|
; Done, set the error code
|
|
err: lda #TGI_ERR_INV_ARG
|
|
: sta ERROR
|
|
rts
|
|
|
|
; SETPALETTE: Set the palette (not available with all drivers/hardware).
|
|
; A pointer to the palette is passed in ptr1. Must set an error if palettes
|
|
; are not supported
|
|
; Must set an error code: YES
|
|
SETPALETTE:
|
|
lda #TGI_ERR_INV_FUNC
|
|
sta ERROR
|
|
rts
|
|
|
|
; GETPALETTE: Return the current palette in A/X. Even drivers that cannot
|
|
; set the palette should return the default palette here, so there's no
|
|
; way for this function to fail.
|
|
; Must set an error code: NO
|
|
GETPALETTE:
|
|
; Fall through
|
|
|
|
; GETDEFPALETTE: Return the default palette for the driver in A/X. All
|
|
; drivers should return something reasonable here, even drivers that don't
|
|
; support palettes, otherwise the caller has no way to determine the colors
|
|
; of the (not changeable) palette.
|
|
; Must set an error code: NO (all drivers must have a default palette)
|
|
GETDEFPALETTE:
|
|
lda #<DEFPALETTE
|
|
ldx #>DEFPALETTE
|
|
rts
|
|
|
|
; SETPIXEL: Draw one pixel at X1/Y1 = ptr1/ptr2 with the current drawing
|
|
; color. The coordinates passed to this function are never outside the
|
|
; visible screen area, so there is no need for clipping inside this function.
|
|
; Must set an error code: NO
|
|
SETPIXEL:
|
|
bit $C082 ; Switch in ROM
|
|
ldy X1
|
|
lda Y1
|
|
jsr PLOT
|
|
bit $C080 ; Switch in LC bank 2 for R/O
|
|
rts
|
|
|
|
; GETPIXEL: Read the color value of a pixel and return it in A/X. The
|
|
; coordinates passed to this function are never outside the visible screen
|
|
; area, so there is no need for clipping inside this function.
|
|
GETPIXEL:
|
|
bit $C082 ; Switch in ROM
|
|
ldy X1
|
|
lda Y1
|
|
jsr SCRN
|
|
tax
|
|
lda COL2TGI,x
|
|
ldx #$00
|
|
bit $C080 ; Switch in LC bank 2 for R/O
|
|
rts
|
|
|
|
; BAR: Draw a filled rectangle with the corners X1/Y1, X2/Y2, where
|
|
; X1/Y1 = ptr1/ptr2 and X2/Y2 = ptr3/ptr4 using the current drawing color.
|
|
; Contrary to most other functions, the graphics kernel will sort and clip
|
|
; the coordinates before calling the driver, so on entry the following
|
|
; conditions are valid:
|
|
; X1 <= X2
|
|
; Y1 <= Y2
|
|
; (X1 >= 0) && (X1 < XRES)
|
|
; (X2 >= 0) && (X2 < XRES)
|
|
; (Y1 >= 0) && (Y1 < YRES)
|
|
; (Y2 >= 0) && (Y2 < YRES)
|
|
; Must set an error code: NO
|
|
BAR:
|
|
bit $C082 ; Switch in ROM
|
|
lda X2
|
|
sta H2
|
|
inc Y2
|
|
ldx Y1
|
|
: txa
|
|
ldy X1
|
|
jsr HLINE ; Preserves X
|
|
inx
|
|
cpx Y2
|
|
bcc :-
|
|
bit $C080 ; Switch in LC bank 2 for R/O
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
|
|
.include "../tgi/tgidrv_line.inc"
|