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cc65/libsrc/lynx/lynx-160-102-16.s
cuz 4964382c67 Added joystick and tgi driver by Karri Kaksonen 
git-svn-id: svn://svn.cc65.org/cc65/trunk@3246 b7a2c559-68d2-44c3-8de9-860c34a00d81
2004-10-14 16:50:50 +00:00

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;
; Graphics driver for the 160x102x16 mode on the Lynx.
;
; Based on Stephen L. Judds GRLIB code
;
.include "zeropage.inc"
.include "tgi-kernel.inc"
.include "tgi-mode.inc"
.include "tgi-error.inc"
.include "lynx.inc"
.macpack generic
; ------------------------------------------------------------------------
; Header. Includes jump table and constants.
.segment "JUMPTABLE"
; 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 160 ; X resolution
.word 102 ; 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
.res 4, $00 ; Reserved for future extensions
; Next comes the jump table. Currently all entries must be valid and may point
; to an RTS for test versions (function not implemented). A future version may
; allow for emulation: In this case the vector will be zero. Emulation means
; that the graphics kernel will emulate the function by using lower level
; primitives - for example ploting a line by using calls to SETPIXEL.
.word INSTALL
.word UNINSTALL
.word INIT
.word DONE
.word GETERROR
.word CONTROL
.word CLEAR
.word SETVIEWPAGE
.word SETDRAWPAGE
.word SETCOLOR
.word SETPALETTE
.word GETPALETTE
.word GETDEFPALETTE
.word SETPIXEL
.word GETPIXEL
.word LINE
.word BAR
.word CIRCLE
.word TEXTSTYLE
.word OUTTEXT
; ------------------------------------------------------------------------
; Data.
; Variables mapped to the zero page segment variables. Some of these are
; used for passing parameters to the driver.
X1 := ptr1
Y1 := ptr2
X2 := ptr3
Y2 := ptr4
RADIUS := tmp1
ROW := tmp2 ; Bitmap row...
COL := tmp3 ; ...and column, both set by PLOT
TEMP := tmp4
TEMP2 := sreg
POINT := regsave
INRANGE := regsave+2 ; PLOT variable, $00 = coordinates in range
CHUNK := X2 ; Used in the line routine
OLDCHUNK := X2+1 ; Dito
; Absolute variables used in the code
.bss
ERROR: .res 1 ; Error code
DRAWINDEX: .res 1 ; Pen to use for drawing
VIEWPAGEL: .res 1
VIEWPAGEH: .res 1
; INIT/DONE
OLDD018: .res 1 ; Old register value
; Line routine stuff
DX: .res 2
DY: .res 2
; Circle routine stuff, overlaid by BAR variables
X1SAVE:
CURX: .res 1
CURY: .res 1
Y1SAVE:
BROW: .res 1 ; Bottom row
TROW: .res 1 ; Top row
X2SAVE:
LCOL: .res 1 ; Left column
RCOL: .res 1 ; Right column
Y2SAVE:
CHUNK1: .res 1
OLDCH1: .res 1
CHUNK2: .res 1
OLDCH2: .res 1
; Text output stuff
TEXTMAGX: .res 1
TEXTMAGY: .res 1
TEXTDIR: .res 1
; Constants and tables
.rodata
DEFPALETTE: .byte >$000
.byte >$007
.byte >$070
.byte >$700
.byte >$077
.byte >$770
.byte >$707
.byte >$777
.byte >$333
.byte >$00F
.byte >$0F0
.byte >$F00
.byte >$0FF
.byte >$FF0
.byte >$F0F
.byte >$FFF
.byte <$000
.byte <$007
.byte <$070
.byte <$700
.byte <$077
.byte <$770
.byte <$707
.byte <$777
.byte <$333
.byte <$00F
.byte <$0F0
.byte <$F00
.byte <$0FF
.byte <$FF0
.byte <$F0F
.byte <$FFF
PALETTESIZE = * - DEFPALETTE
BITTAB: .byte $80,$40,$20,$10,$08,$04,$02,$01
BITCHUNK: .byte $FF,$7F,$3F,$1F,$0F,$07,$03,$01
VBASE = $E000 ; Video memory base address
CBASE = $D000 ; Color memory base address
.code
; ------------------------------------------------------------------------
; 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:
rts
; ------------------------------------------------------------------------
; 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:
rts
; ------------------------------------------------------------------------
; 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:
; Done, reset the error code
lda #TGI_ERR_OK
sta ERROR
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:
rts
; ------------------------------------------------------------------------
; GETERROR: Return the error code in A and clear it.
GETERROR:
ldx #TGI_ERR_OK
lda ERROR
stx ERROR
rts
; ------------------------------------------------------------------------
; CONTROL: Platform/driver specific entry point.
;
; Must set an error code: YES
;
CONTROL:
lda #TGI_ERR_INV_FUNC
sta ERROR
rts
; ------------------------------------------------------------------------
; CLEAR: Clears the screen.
;
; Must set an error code: NO
;
.rodata
pixel_bitmap:
.byte 3,%10000100,%00000000, $0 ; A pixel bitmap
cls_sprite:
.byte %00000001 ; A pixel sprite
.byte %00010000
.byte %00100000
.addr 0,pixel_bitmap
.word 0
.word 0
.word $a000 ; 160
.word $6600 ; 102
.byte $00
.code
CLEAR: lda #<cls_sprite
ldx #>cls_sprite
draw_sprite:
sta $fc10
stx $fc11
lda #1
sta $fc91
stz $fd90
@L3: stz CPUSLEEP
lda $fc92
lsr
bcs @L3
stz $fd90
rts
; ------------------------------------------------------------------------
; SETVIEWPAGE: Set the visible page. Called with the new page in A (0..n).
; The page number is already checked to be valid by the graphics kernel.
;
; Must set an error code: NO (will only be called if page ok)
;
SETVIEWPAGE:
beq @L1
lda #<$fe00-8160-8160
ldx #>$fe00-8160-8160
bra @L2
@L1: lda #<$fe00-8160
ldx #>$fe00-8160
@L2: sta DISPADRL ; $FD94
sta VIEWPAGEL
stx DISPADRH ; $FD95
sta VIEWPAGEH
rts
; ------------------------------------------------------------------------
; SETDRAWPAGE: Set the drawable page. Called with the new page in A (0..n).
; The page number is already checked to be valid by the graphics kernel.
;
; Must set an error code: NO (will only be called if page ok)
;
SETDRAWPAGE:
beq @L1
lda #<$fe00-8160-8160
ldx #>$fe00-8160-8160
bra @L2
@L1: lda #<$fe00-8160
ldx #>$fe00-8160
@L2: sta VIDBASL ; $FD94
stx VIDBASH ; $FD95
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:
sta DRAWINDEX
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:
ldy #31
@L1: lda (ptr1),y
sta GCOLMAP,y ; $FDA0
dey
bpl @L1
; Done, reset the error code
lda #TGI_ERR_OK
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:
lda #<GCOLMAP ; $FDA0
ldx #>GCOLMAP
rts
; ------------------------------------------------------------------------
; 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
;
.data
pixel_sprite:
.byte %00000001 ; A pixel sprite
.byte %00010000
.byte %00100000
.addr 0,pixel_bitmap
pix_x: .word 0
pix_y: .word 0
.word $0100
.word $0100
pix_c: .byte $00
.code
SETPIXEL:
lda X1
sta pix_x
lda Y1
sta pix_y
lda DRAWINDEX
sta pix_c
lda #<pixel_sprite
ldx #>pixel_sprite
jmp draw_sprite
; ------------------------------------------------------------------------
; GETPIXEL: Read the color value of a pixel and return it in A/X. The
; coordinates passed to this function are never outside the visible screen
; area, so there is no need for clipping inside this function.
GETPIXEL:
lda Y1
sta MATHD ; Hardware multiply
stz MATHC
lda #80
sta MATHB
stz MATHA
lda X1
lsr A
php
tay
clc
lda VIEWPAGEL
adc MATHH
sta ptr1
lda VIEWPAGEH
adc MATHG
sta ptr1+1
ldx #0
lda (ptr1),y
plp
bcc @L1
and #$f
rts
@L1: lsr A
lsr A
lsr A
lsr A
rts
; ------------------------------------------------------------------------
; LINE: Draw a line from X1/Y1 to X2/Y2, where X1/Y1 = ptr1/ptr2 and
; X2/Y2 = ptr3/ptr4 using the current drawing color.
;
; To deal with off-screen coordinates, the current row
; and column (40x25) is kept track of. These are set
; negative when the point is off the screen, and made
; positive when the point is within the visible screen.
;
; X1,X2 etc. are set up above (x2=LINNUM in particular)
; Format is LINE x2,y2,x1,y1
;
; Must set an error code: NO
;
LINE:
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
;
.data
bar_sprite:
.byte %00000001 ; A pixel sprite
.byte %00010000
.byte %00100000
.addr 0,pixel_bitmap
bar_x: .word 0
bar_y: .word 0
bar_sx: .word $0100
bar_sy: .word $0100
bar_c: .byte $00
.code
BAR: lda X1
sta bar_x
lda Y1
sta bar_y
lda X2
sec
sbc X1
sta bar_sx+1
lda Y2
sec
sbc Y1
sta bar_sy+1
lda DRAWINDEX
sta bar_c
lda #<bar_sprite
ldx #>bar_sprite
jmp draw_sprite
; ------------------------------------------------------------------------
; CIRCLE: Draw a circle around the center X1/Y1 (= ptr1/ptr2) with the
; radius in tmp1 and the current drawing color.
;
; Must set an error code: NO
;
CIRCLE:
rts
; ------------------------------------------------------------------------
; 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:
stx TEXTMAGX
sty TEXTMAGY
sta TEXTDIR
rts
; ------------------------------------------------------------------------
; 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
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