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cc65/libsrc/atari/atari_tgi_common.inc
cpg cce24a2c9a no TGI_ERR_NO_MEM or TGI_ERR_NO_IOCB anymore: replaced by TGI_ERR_NO_RES 
git-svn-id: svn://svn.cc65.org/cc65/trunk@4469 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-11-15 14:55:14 +00:00

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;
; Generic Atari graphics driver
;
.macpack longbranch
; ******************************************************************************
; ----------------------------------------------------------------------
;
; Header. Includes jump table and constants.
;
; ----------------------------------------------------------------------
.segment "JUMPTABLE"
; Header
.byte $74, $67, $69 ; "tgi"
.byte TGI_API_VERSION ; TGI API version number
.word x_res ; X resolution
.word y_res ; Y resolution
.byte colors ; Number of drawing colors
.byte pages ; Number of screens available
.byte 8 ; System font X size
.byte 8 ; System font Y size
.word aspect ; Aspect ratio
; Function table
.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
; ******************************************************************************
; ----------------------------------------------------------------------
;
; Parameters
;
; ----------------------------------------------------------------------
x1 := ptr1
y1 := ptr2
x2 := ptr3
y2 := ptr4
radius := tmp1
; ******************************************************************************
; ----------------------------------------------------------------------
;
; Global variables
;
; ----------------------------------------------------------------------
sptr := regsave + 2
.bss
error:
.res 1 ; Error code
.if ::grmode = 9 || ::grmode = 11
palette = default_palette
.else
palette:
.res colors ; The current palette
.endif
mask:
.res 1 ; Current pixel mask
griocb:
.res 1 ; IOCB channel number for graphics
.if pages = 2
p0scr:
.res 1 ; High byte of screen address for screen page 0
p0dls:
.res 1 ; High byte of display list address for screen page 0
; Page 1's addresses are 8K higher
.endif
.data
mag_x:
.byte 1 ; Horizontal text scaling factor
mag_y:
.byte 1 ; Vertical text scaling factor
mag_x8:
.word 8 ; Horizontal text scaling factor * 8
mag_y8:
.word 8 ; Vertical text scaling factor * 8
text_dir:
.byte 0 ; Text direction,
.code
; ******************************************************************************
.macro put_pixel
; ----------------------------------------------------------------------
;
; Put a pixel at (sptr),y using x as the bit mask offset
;
; ----------------------------------------------------------------------
lda (sptr),y
eor mask
and mask_table,x
eor (sptr),y
sta (sptr),y
.endmacro
; ******************************************************************************
.rodata
screen_device:
.byte "S:",$9B ; Device code for screen
screen_device_length := * - screen_device
.code
.proc INIT
; ----------------------------------------------------------------------
;
; INIT: Switch to graphics mode
;
; ----------------------------------------------------------------------
.code
; Initialize drawing color
.if ::ppb = 8
ldx #$FF
.elseif ::ppb = 4
ldx #$55
.elseif ::ppb = 2
ldx #$11
.endif
stx mask
; Find a free IOCB
lda #$70
search: tax
ldy ICHID,x
cpy #$FF
beq found
sub #$10
bcs search
; Not enough resources available (free IOCB or memory)
; enter with C cleared!
nores: lda #TGI_ERR_NO_RES
bcc exit
found: ; Check if enough RAM is available
lda #0
sub #<mem_needed
tay
lda RAMTOP
sbc #>mem_needed
cmp APPMHI + 1
bcc nores
bne switch
cpy APPMHI
bcc nores ; not enough memory
; Switch into graphics mode
switch: lda #OPEN
sta ICCOM,x
lda #OPNIN | OPNOT
sta ICAX1,x
lda #::grmode
sta ICAX2,x
lda #<screen_device
sta ICBAL,x
lda #>screen_device
sta ICBAH,x
lda #<screen_device_length
sta ICBLL,x
lda #>screen_device_length
sta ICBLH,x
jsr CIOV
.if ::pages = 2
; Reserve 8K of high memory
lda RAMTOP
sub #32
sta RAMTOP
; Close and reopen graphics
lda #CLOSE
sta ICCOM,x
jsr CIOV
; Reopen graphics
lda #OPEN
sta ICCOM,x
lda #OPNIN | OPNOT
sta ICAX1,x
lda #::grmode
sta ICAX2,x
lda #<screen_device
sta ICBAL,x
lda #>screen_device
sta ICBAH,x
lda #<screen_device_length
sta ICBLL,x
lda #>screen_device_length
sta ICBLH,x
jsr CIOV
; Save screen pointers
lda SAVMSC + 1
sta p0scr
lda SDLSTH
sta p0dls
.endif ; ::pages = 2
stx griocb
; Reset the error code and return
lda #TGI_ERR_OK
exit: sta error
rts
.endproc
; ******************************************************************************
.proc DONE
; ----------------------------------------------------------------------
;
; DONE: Switch back to text mode
;
; ----------------------------------------------------------------------
.code
.if ::pages = 2
; Free 8K of high memory
lda RAMTOP
add #32
sta RAMTOP
.endif
; Clear griocb
lda #$FF
ldx griocb
sta griocb
; Close the S: device
lda #CLOSE
sta ICCOM,x
jsr CIOV
; Reopen it in Graphics 0
lda #OPEN
sta ICCOM,x
lda #OPNIN | OPNOT
sta ICAX1,x
lda #0
sta ICAX2,x
lda #<screen_device
sta ICBAL,x
lda #>screen_device
sta ICBAH,x
lda #<screen_device_length
sta ICBLL,x
lda #>screen_device_length
sta ICBLH,x
jsr CIOV
; Now close it again; we don't need it anymore :)
lda #CLOSE
sta ICCOM,x
jmp CIOV
.endproc
; ******************************************************************************
.proc GETERROR
; ----------------------------------------------------------------------
;
; GETERROR: Return the error code in A and clear it
;
; ----------------------------------------------------------------------
.code
ldx #TGI_ERR_OK
lda error
stx error
rts
.endproc
; ******************************************************************************
.proc CLEAR
; ----------------------------------------------------------------------
;
; CLEAR: Clear the screen
;
; ----------------------------------------------------------------------
.code
; Load the screen address in sptr
lda SAVMSC
sta sptr
lda SAVMSC + 1
sta sptr + 1
; Fill with zero
lda #0
tay
.if >::scrsize > 0
; Clear full pages if any
ldx #>::scrsize
loop1: sta (sptr),y
iny
bne loop1
inc sptr + 1
dex
bne loop1
.endif
.if <::scrsize > 0
; Clear the rest, if any
loop2: sta (sptr),y
iny
cpy #<::scrsize
bne loop2
.endif
rts
.endproc
; ******************************************************************************
.proc GETPALETTE
; ----------------------------------------------------------------------
;
; GETPALETTE: Return the current palette in A/X
;
; ----------------------------------------------------------------------
.code
lda #<palette
ldx #>palette
rts
.endproc
; ******************************************************************************
.proc GETDEFPALETTE
; ----------------------------------------------------------------------
;
; GETDEFPALETTE: Return the default palette in A/X
;
; ----------------------------------------------------------------------
.code
lda #<default_palette
ldx #>default_palette
rts
.endproc
; ******************************************************************************
.proc SETCOLOR
; ----------------------------------------------------------------------
;
; SETCOLOR: Set the drawing color (in A)
;
; ----------------------------------------------------------------------
.code
tax
.if ::grmode = 9
; Map colors like this: 0 -> 0, 1 -> 15, 2 -> 1, 3 -> 2 etc.
beq cont
cpx #1
bne map
ldx #16
map: dex
cont:
.endif
lda masks,x
sta mask
rts
.endproc
; ******************************************************************************
.proc CALC
; ----------------------------------------------------------------------
;
; CALC: Calculate the screen address
; in
; x1 (ptr1) x coordinate
; y1 (ptr2) y coordinate
; out
; sptr + y screen address
; x bit mask index
;
; ----------------------------------------------------------------------
.bss
temp: .res 1
.code
; calculate line offset
lda y1 + 1
sta temp
lda y1
.if ::x_res / ::ppb = 40
yrep = 3
.elseif ::x_res / ::ppb = 20
yrep = 2
.elseif ::x_res / ::ppb = 10
yrep = 1
.endif
.repeat yrep
asl a
rol temp
.endrepeat
sta sptr
ldx temp
stx sptr + 1
.repeat 2
asl a
rol temp
.endrepeat
add sptr
sta sptr
lda temp
adc sptr + 1
sta sptr + 1
; calculate bit mask offset
lda x1
and #ppb - 1
tax
; calculate row offset
lda x1 + 1
sta temp
lda x1
.if ::ppb = 8
xrep = 3
.elseif ::ppb = 4
xrep = 2
.elseif ::ppb = 2
xrep = 1
.endif
.repeat xrep
lsr temp
ror a
.endrepeat
tay
; sptr += SAVMSC
lda SAVMSC
add sptr
sta sptr
lda SAVMSC + 1
adc sptr + 1
sta sptr + 1
; We're done!
rts
.endproc
; ******************************************************************************
.proc SETPIXEL
; ----------------------------------------------------------------------
;
; Draw one pixel at x1, y1
;
; ----------------------------------------------------------------------
.code
jsr CALC
put_pixel
rts
.endproc
; ******************************************************************************
.proc GETPIXEL
; ----------------------------------------------------------------------
;
; GETPIXEL: Read the color value of a pixel and return it in A/X
;
; ----------------------------------------------------------------------
.code
jsr CALC
lda (sptr),y
and mask_table,x
.if ::ppb = 8
beq zero
lda #1
zero: ldx #0
rts
.elseif ::ppb = 4
loop: cpx #3
beq done4
lsr a
lsr a
inx
bne loop
done4: and #$03
ldx #0
rts
.elseif ::ppb = 2
dex
bne shift
and #$0F
jmp exit
shift: lsr a
lsr a
lsr a
lsr a
exit:
.if ::grmode = 9
; Mode 9 mapping
; Map colors like this: 0 -> 0, 15 -> 1, 2 -> 3, 3 -> 4 etc.
beq done9
cmp #15
bne map9
lda #0
map9: add #1
done9:
.endif
.if ::grmode = 10
; Mode 10 mapping
; Map out of range colors like this:
; 9 -> 8
; 10 -> 8
; 11 -> 8
; 12 -> 0
; 13 -> 1
; 14 -> 2
; 15 -> 3
cmp #9
bcc done10
sub #12
bcs done10
lda #8
done10:
.endif ; ::grmode = 10
; Done!
ldx #0
rts
.endif ; ::ppb = 2
.endproc
; ******************************************************************************
.proc LINE
; ----------------------------------------------------------------------
;
; LINE: Draw a line from x1,y1 to x2,y2
;
; ----------------------------------------------------------------------
.ifdef USE_CIO_LINE
; position ptr1, ptr2
lda x1
sta OLDCOL
lda x1 + 1
sta OLDCOL + 1
lda y1
sta OLDROW
; plot
jsr SETPIXEL
; position ptr3,ptr4
lda x2
sta COLCRS
lda x2 + 1
sta COLCRS + 1
lda y2
sta ROWCRS
; drawto
ldx griocb
lda #DRAWLN
sta ICCOM,x
lda mask
.if ::grmode = 10
and #$0f
.else
and #colors - 1
.endif
sta ATACHR
jmp CIOV
.else ; USE_CIO_LINE
; locals
dx := sreg
dy := y1
dx2 := x2
dy2 := y2
iy := tmp1
err := tmp3
.code
; dx = x2 - x1
lda x2
sub x1
sta dx
lda x2 + 1
sbc x1 + 1
sta dx + 1
; if dx is positive, no problem
bcs dx_positive
; if dx is negative, swap x1,y1 with x2,y2
lda x1 ; x1 <-> x2, low byte
ldx x2
sta x2
stx x1
lda x1 + 1 ; x1 <-> x2, high byte
ldx x2 + 1
sta x2 + 1
stx x1 + 1
lda y1 ; y1 <-> y2, low byte
ldx y2
sta y2
stx y1
lda y1 + 1 ; y1 <-> y2, high byte
ldx y2 + 1
sta y2 + 1
stx y1 + 1
; Calculate again
jmp LINE
dx_positive:
; Calculate coords
jsr CALC
; dy = y2 - y1
lda y2
sub y1
sta dy
lda y2 + 1
sbc y1 + 1
sta dy + 1
; if dy is negative
bcs dy_positive
; dy = -dy
lda #0
sub dy
sta dy
lda #0
sbc dy + 1
sta dy + 1
; iy = -row_size
lda #<(65536 - x_res / ppb)
sta iy
lda #>(65536 - x_res / ppb)
sta iy + 1
bne skip_iy_1 ; always
dy_positive:
; iy = row_size
lda #<(x_res / ppb)
sta iy
lda #>(x_res / ppb)
sta iy + 1
skip_iy_1:
; dx2 = dx * 2
lda dx
asl a
sta dx2
lda dx + 1
rol a
sta dx2 + 1
; dy2 = dy * 2
lda dy
asl a
sta dy2
lda dy + 1
rol a
sta dy2 + 1
; if dx >= dy
lda dx
cmp dy
lda dx + 1
sbc dy + 1
bcc dy_major
; dx is the major axis
; err = dy2 - dx
lda dy2
sub dx
sta err
lda dy2 + 1
sbc dx + 1
sta err + 1
.scope
loop: ; main loop
put_pixel
; if err >= 0
lda err + 1
bmi err_neg
; err -= dx2
lda err
sub dx2
sta err
lda err + 1
sbc dx2 + 1
sta err + 1
; move_vertical (iy)
lda sptr
add iy
sta sptr
lda sptr + 1
adc iy + 1
sta sptr + 1
err_neg:
; err += dy2
lda err
add dy2
sta err
lda err + 1
adc dy2 + 1
sta err + 1
; move_right
inx
cpx #ppb
bne end_move
ldx #0
iny
bne end_move
inc sptr + 1
end_move:
; loop while dx-- >= 0
lda dx
ora dx + 1
beq exit
dec dx
lda dx
cmp #$FF
bne loop
dec dx + 1
jmp loop
exit: rts
.endscope
dy_major:
; dy is the major axis
; err = dx2 - dy;
lda dx2
sub dy
sta err
lda dx2 + 1
sbc dy + 1
sta err + 1
.scope
loop: ; main loop
put_pixel
; if err >= 0
lda err + 1
bmi end_move
; err -= dy2
lda err
sub dy2
sta err
lda err + 1
sbc dy2 + 1
sta err + 1
; move_right
inx
cpx #ppb
bne end_move
ldx #0
iny
bne end_move
inc sptr + 1
end_move:
; err += dx2
lda err
add dx2
sta err
lda err + 1
adc dx2 + 1
sta err + 1
; move_vertical(iy)
lda sptr
add iy
sta sptr
lda sptr + 1
adc iy + 1
sta sptr + 1
; loop while dy-- >= 0
lda dy
ora dy + 1
beq exit
dec dy
lda dy
cmp #$FF
bne loop
dec dy + 1
jmp loop
exit: rts
.endscope
.endif ; USE_CIO_LINE
.endproc
; ******************************************************************************
.proc clipped_bar
; ----------------------------------------------------------------------
;
; Clip and draw bar, this function will disappear when text clipping
; will be done int the TGI kernel
;
; ----------------------------------------------------------------------
.code
lda y1 + 1
bne off
lda y1
cmp #y_res
bcs off
lda x1 + 1
.if >(::x_res - 1) > 0
cmp #>x_res
bcc check2
.endif
bne off
lda x1
cmp #<x_res
bcc check2
off: rts
check2: lda y2 + 1
bne off
lda y2
cmp #y_res
bcs off
lda x2 + 1
.if >(::x_res - 1) > 0
cmp #>x_res
bcc BAR
.endif
bne off
lda x2
cmp #<x_res
bcs off
.endproc
; ******************************************************************************
.proc BAR
; ----------------------------------------------------------------------
;
; BAR: Draw a filled rectangle with the corners at x1,y1,x2,y2
;
; ----------------------------------------------------------------------
; locals
lmem := sreg
.bss
lmask: .res 1
rmask: .res 1
dy: .res 1
dx: .res 1
fmask: .res 1
.code
; dy = y2 - y1 + 1
lda y2
sub y1
sta dy
inc dy
; Calculate upper left corner
jsr CALC
; Save the values
tya
add sptr
sta lmem
lda sptr + 1
adc #0
sta lmem + 1
lda bar_table,x
sta lmask
; Calculate upper right corner
lda x2
sta x1
.if >(::x_res - 1) > 0
lda x2 + 1
sta x1 + 1
.endif
jsr CALC
; Save the values
tya
add sptr
sta sptr
bcc skips
inc sptr + 1
skips: inx
lda bar_table,x
eor #$FF
sta rmask
; Calculate memory difference between x1 and x2
lda sptr
sub lmem
sta dx
loop: ; Main loop
ldy #0
ldx dx
beq same
; Left
lda (lmem),y
eor mask
and lmask
eor (lmem),y
sta (lmem),y
iny
; Between
lda mask
jmp next
btwn: sta (lmem),y
iny
next: dex
bne btwn
; Right
lda (lmem),y
eor mask
and rmask
eor (lmem),y
sta (lmem),y
jmp cont
same: ; Same byte
lda lmask
and rmask
sta fmask
lda (lmem),y
eor mask
and fmask
eor (lmem),y
sta (lmem),y
cont: ; Go to next row
lda lmem
add #<(x_res / ppb)
sta lmem
bcc skipm
inc lmem + 1
skipm: ; Loop while --dy > 0
dec dy
bne loop
rts
.endproc
; ******************************************************************************
.proc TEXTSTYLE
; ----------------------------------------------------------------------
;
; TEXTSTYLE: Set text style. Scale factors in X and Y and direction in A
;
; ----------------------------------------------------------------------
.code
stx mag_x
sty mag_y
; Save text direction in bit 8 so that we can use BIT instruction later
lsr a
ror a
sta text_dir
; Save 8 * scaling factors
lda #0
sta mag_x8 + 1
sta mag_y8 + 1
; Save 8 * mag_x
txa
.repeat 3
asl a
rol mag_x8 + 1
.endrepeat
sta mag_x8
; Save 8 * mag_y
tya
.repeat 3
asl a
rol mag_y8 + 1
.endrepeat
sta mag_y8
; Done!
rts
.endproc
; ******************************************************************************
.proc OUTTEXT
; ----------------------------------------------------------------------
;
; OUTTEXT: Draw text at x1, y1. String is in ptr3
;
; ----------------------------------------------------------------------
; locals
string := tmp1
cols := tmp3
pixels := tmp4
font := regsave
.rodata
ataint: .byte 64,0,32,96
.bss
rows: .res 1
.if >(::x_res - 1) > 0
oldx1: .res 2
oldx2: .res 2
.else
oldx1: .res 1
oldx2: .res 1
.endif
oldy1: .res 1
oldy2: .res 1
inv: .res 1
.code
; Don't draw zero sized characters
lda mag_x
ora mag_y
bne not0
rts
not0: ; Save string address, ptr3 is needed by BAR
lda ptr3
sta string
lda ptr3 + 1
sta string + 1
bit text_dir
bmi vert
; Calculate x2
lda mag_x
sub #1
add x1
sta x2
.if >(::x_res - 1) > 0
lda x1 + 1
adc #0
sta x2 + 1
.else
lda #0
sta x2 + 1
.endif
; Calculate y2 and adjust y1
dec y1
lda y1
sta y2
sub mag_y
add #1
sta y1
lda #0
sta y2 + 1
jmp while
; Calculate for vertical text
vert: lda x1
sub #1
sta x2
lda x1 + 1
sbc #0
sta x2 + 1
lda x1
sub mag_y
sta x1
lda x1 + 1
sbc #0
sta x1 + 1
lda mag_x
sub #1
add y1
sta y2
lda #0
sta y2 + 1
jmp while
; Main loop
loop: inc string
bne skiph
inc string + 1
skiph: ; Save coords
bit text_dir
bmi scvert
ldx y1
stx oldy1
ldx y2
stx oldy2
jmp draw
scvert: ldx x1
stx oldx1
ldx x2
stx oldx2
.if >(::x_res - 1) > 0
ldx x1 + 1
stx oldx1 + 1
ldx x2 + 1
stx oldx2 + 1
.endif
; Draw one character
; Convert to ANTIC code
draw: tay
rol a
rol a
rol a
rol a
and #3
tax
tya
and #$9f
ora ataint,x
; Save and clear inverse video bit
sta inv
and #$7F
; Calculate font data address
sta font
lda #0
sta font + 1
.repeat 3
asl font
rol a
.endrepeat
adc CHBAS
sta font + 1
; Save old coords
bit text_dir
bpl hor
lda y1
sta oldy1
lda y2
sta oldy2
jmp cont
hor: lda x1
sta oldx1
lda x2
sta oldx2
.if >(::x_res - 1) > 0
lda x1 + 1
sta oldx1 + 1
lda x2 + 1
sta oldx2 + 1
.endif
; Get glyph pixels
cont: ldy #7
; Put one row of the glyph
putrow: sty rows
lda (font),y
bit inv
bpl noinv
eor #$FF
noinv: sta pixels
lda #7
sta cols
; Put one column of the row
putcol: asl pixels
bcc next_col
lda x1
pha
lda x1 + 1
pha
jsr clipped_bar
pla
sta x1 + 1
pla
sta x1
next_col:
; Go to next column
; increase x coords
bit text_dir
bmi vertinc
lda mag_x
add x1
sta x1
bcc L1
inc x1 + 1
L1: lda mag_x
add x2
sta x2
bcc L2
inc x2 + 1
jmp L2
vertinc:
lda y1
sub mag_x
sta y1
lda y2
sub mag_x
sta y2
L2:
dec cols
bpl putcol
next_row:
; Go to next row
bit text_dir
bmi verty
lda y1
sub mag_y
sta y1
bcs L3
dec y1 + 1
L3: lda y2
sub mag_y
sta y2
bcs L6
dec y2 + 1
L4: jmp L6
verty: lda x1
sub mag_y
sta x1
bcs L5
dec x1 + 1
L5: lda x2
sub mag_y
sta x2
bcs L6
dec x2 + 1
L6:
; Restore old values
bit text_dir
bpl reshor
lda oldy1
sta y1
lda oldy2
sta y2
jmp nextrow
reshor: lda oldx1
sta x1
lda oldx2
sta x2
.if >(::x_res - 1) > 0
lda oldx1 + 1
sta x1 + 1
lda oldx2 + 1
sta x2 + 1
.endif
; Next row
nextrow:
ldy rows
dey
jpl putrow
; Restore coords
bit text_dir
bmi resvert
ldx oldy1
stx y1
ldx oldy2
stx y2
ldx #0
stx y1 + 1
stx y2 + 1
lda mag_x8
add x1
sta x1
lda mag_x8 + 1
adc x1 + 1
sta x1 + 1
lda mag_x8
add x2
sta x2
lda mag_x8 + 1
adc x2 + 1
sta x2 + 1
jmp while
resvert:
ldx oldx1
stx x1
ldx oldx2
stx x2
.if >(::x_res - 1) > 0
ldx oldx1 + 1
stx x1 + 1
ldx oldx2 + 1
stx x2 + 1
.endif
lda y1
sub mag_x8
sta y1
lda y1 +1
sbc mag_x8 + 1
sta y1 + 1
lda y2
sub mag_x8
sta y2
lda y2 +1
sbc mag_x8 + 1
sta y2 + 1
; End of loop
while: ldy #0
lda (string),y
jne loop ; Check for null character
rts
.endproc
.if pages = 2
; ******************************************************************************
.proc SETVIEWPAGE
; ----------------------------------------------------------------------
;
; SETVIEWPAGE, page in A
;
; ----------------------------------------------------------------------
.code
tax
beq cont
lda #32
cont: add p0dls
cmp SDLSTH
beq done ; We're already in the desired page
ldx RTCLOK + 2
sta SDLSTH
; Wait until next VBLANK
wait: cpx RTCLOK + 2
beq wait
; Done
done: rts
.endproc
; ******************************************************************************
.proc SETDRAWPAGE
; ----------------------------------------------------------------------
;
; SETDRAWPAGE, page in A
;
; ----------------------------------------------------------------------
.code
tax
beq cont
lda #32
cont: add p0scr
sta SAVMSC + 1
rts
.endproc
.endif
; ******************************************************************************
; ----------------------------------------------------------------------
;
; Unimplemented functions that require an error code
;
; ----------------------------------------------------------------------
CONTROL:
lda #TGI_ERR_INV_FUNC
sta error
; fall through
; ******************************************************************************
; ----------------------------------------------------------------------
;
; Unimplemented functions that don't require an error code
;
; ----------------------------------------------------------------------
INSTALL:
UNINSTALL:
.if pages = 1
SETVIEWPAGE:
SETDRAWPAGE:
.endif
rts
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