mirror of
https://github.com/cc65/cc65.git
synced 2024-11-03 10:07:02 +00:00
5304a8149e
* Removed CIRCLE * Aspect ratio is a new header variable * Removed the reserved bytes - it's easier to bump the API version * Clipping is done completely in the wrapper git-svn-id: svn://svn.cc65.org/cc65/trunk@4396 b7a2c559-68d2-44c3-8de9-860c34a00d81
402 lines
9.0 KiB
ArmAsm
402 lines
9.0 KiB
ArmAsm
;
|
|
; Graphics driver for the 240x200x2 mode on the Atmos
|
|
;
|
|
; Stefan Haubenthal <polluks@sdf.lonestar.org>
|
|
;
|
|
|
|
.include "zeropage.inc"
|
|
|
|
.include "tgi-kernel.inc"
|
|
.include "tgi-mode.inc"
|
|
.include "tgi-error.inc"
|
|
.include "atmos.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 240 ; X resolution
|
|
.word 200 ; Y resolution
|
|
.byte 2 ; Number of drawing colors
|
|
.byte 1 ; Number of screens available
|
|
xsize: .byte 6 ; System font X size
|
|
.byte 8 ; System font Y size
|
|
.word $100 ; Aspect ratio
|
|
|
|
; Next comes the jump table. Currently 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
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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
|
|
|
|
; Absolute variables used in the code
|
|
|
|
.bss
|
|
|
|
ERROR: .res 1 ; Error code
|
|
MODE: .res 1 ; Graphics mode
|
|
|
|
; Constants and tables
|
|
PARAM1 = $2E1
|
|
PARAM2 = $2E3
|
|
PARAM3 = $2E5
|
|
TEXT = $EC21
|
|
HIRES = $EC33
|
|
CURSET = $F0C8
|
|
CURMOV = $F0FD
|
|
DRAW = $F110
|
|
CHAR = $F12D
|
|
POINT = $F1C8
|
|
PAPER = $F204
|
|
INK = $F210
|
|
|
|
.rodata
|
|
|
|
DEFPALETTE: .byte $00, $07
|
|
|
|
.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:
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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:
|
|
|
|
; Switch into graphics mode
|
|
|
|
jsr HIRES
|
|
|
|
; 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 = TEXT
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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:
|
|
sta $213
|
|
lda #TGI_ERR_OK
|
|
sta ERROR
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; CLEAR: Clears the screen.
|
|
;
|
|
; Must set an error code: NO
|
|
;
|
|
|
|
CLEAR = HIRES
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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:
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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:
|
|
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 MODE
|
|
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 #0
|
|
lda (ptr1),y
|
|
sta PARAM1
|
|
jsr PAPER
|
|
ldy #1
|
|
lda (ptr1),y
|
|
sta PARAM1
|
|
jsr INK
|
|
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:
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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:
|
|
lda MODE
|
|
mymode: sta PARAM3
|
|
lda X1
|
|
sta PARAM1
|
|
lda Y1
|
|
sta PARAM2
|
|
lda #0
|
|
sta PARAM1+1
|
|
sta PARAM2+1
|
|
jmp CURSET
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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 X1
|
|
sta PARAM1
|
|
lda Y1
|
|
sta PARAM2
|
|
lda #0
|
|
sta PARAM1+1
|
|
sta PARAM2+1
|
|
jsr POINT
|
|
lda PARAM1
|
|
and #%00000001
|
|
ldx #0
|
|
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.
|
|
;
|
|
; Must set an error code: NO
|
|
;
|
|
|
|
LINE:
|
|
jsr SETPIXEL
|
|
lda X2
|
|
sub X1
|
|
sta PARAM1
|
|
lda X2+1
|
|
sbc X1+1
|
|
sta PARAM1+1
|
|
lda Y2
|
|
sub Y1
|
|
sta PARAM2
|
|
lda Y2+1
|
|
sbc Y1+1
|
|
sta PARAM2+1
|
|
lda MODE
|
|
sta PARAM3
|
|
jmp DRAW
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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:
|
|
inc Y2
|
|
@L1: lda Y2
|
|
pha
|
|
lda Y1
|
|
sta Y2
|
|
jsr LINE
|
|
pla
|
|
sta Y2
|
|
inc Y1
|
|
cmp Y1
|
|
bne @L1
|
|
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:
|
|
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:
|
|
lda X1
|
|
sta PARAM1
|
|
lda Y1
|
|
sta PARAM2
|
|
lda #3
|
|
sta PARAM3
|
|
jsr CURSET
|
|
|
|
ldy #0
|
|
@next: lda (ptr3),y
|
|
beq @end
|
|
sta PARAM1
|
|
lda #0
|
|
sta PARAM2
|
|
lda MODE
|
|
sta PARAM3
|
|
tya
|
|
pha
|
|
jsr CHAR
|
|
lda xsize
|
|
sta PARAM1
|
|
lda #0
|
|
sta PARAM2
|
|
lda #3
|
|
sta PARAM3
|
|
jsr CURMOV
|
|
pla
|
|
tay
|
|
iny
|
|
bne @next
|
|
@end: rts
|