mirror of https://github.com/cc65/cc65.git
415 lines
11 KiB
ArmAsm
415 lines
11 KiB
ArmAsm
;
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; Graphics driver for the 228x200x3 palette mode on the Atmos
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;
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; Stefan Haubenthal <polluks@sdf.lonestar.org>
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; 2014-09-10, Greg King <gregdk@users.sf.net>
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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 "atmos.inc"
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.macpack generic
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.macpack module
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XSIZE = 6 ; System font width
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YSIZE = 8 ; System font height
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; ------------------------------------------------------------------------
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; Header. Includes jump table and constants.
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module_header _atmos_228_200_3_tgi
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; The first part of the header is a structure that has a signature,
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; and defines the capabilities of the driver.
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.byte "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 228 ; x resolution
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.word 200 ; y resolution
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.byte 3 ; Number of drawing colors
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.byte 1 ; Number of screens available
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.byte XSIZE ; System font x size
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.byte YSIZE ; System font y size
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.word $011C ; 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. Currently, all entries must be valid;
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; 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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; Data.
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; Variables mapped to the zero-page segment variables. 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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; Absolute variables used in the code
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.bss
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ERROR: .res 1 ; Error code
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MODE: .res 1 ; Graphics mode
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PALETTE: .res 2
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; Constant table
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.rodata
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; Default colors: black background, white foreground
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; (The third "color" actually flips a pixel
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; between the foreground and background colors.)
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;
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DEFPALETTE: .byte 0, 1
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.code
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; ------------------------------------------------------------------------
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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 called only once. So, any code that is needed
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; to initialize variables and so on must go here. Setting palette and
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; clearing the screen are not needed because they are called by the graphics
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; kernel later.
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; The graphics kernel never will 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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;
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; Must set an error code: YES
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;
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INIT:
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; Switch into graphics mode.
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jsr HIRES
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; Done, reset the error code.
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; ------------------------------------------------------------------------
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; GETERROR: Return the error code in A, and clear it.
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GETERROR:
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ldx #TGI_ERR_OK
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lda ERROR
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stx ERROR
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; ------------------------------------------------------------------------
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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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;
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; Must set an error code: NO
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;
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INSTALL:
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; ------------------------------------------------------------------------
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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 probably is empty most of the time.
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;
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; Must set an error code: NO
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;
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UNINSTALL:
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rts
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; ------------------------------------------------------------------------
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; DONE: Will be called to switch the graphics device back into text mode.
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; The graphics kernel never will 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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;
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; Must set an error code: NO
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;
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DONE := TEXT
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; ------------------------------------------------------------------------
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; CONTROL: Platform-/driver-specific entry point.
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;
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; Must set an error code: YES
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;
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CONTROL:
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sta PATTERN
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lda #TGI_ERR_OK
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sta ERROR
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rts
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; ------------------------------------------------------------------------
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; CLEAR: Clears the screen.
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;
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; Must set an error code: NO
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;
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CLEAR := HIRES
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; ------------------------------------------------------------------------
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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 already is checked to be valid, by the graphics kernel.
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;
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; Must set an error code: NO (will be called only if page OK)
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;
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SETVIEWPAGE:
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; ------------------------------------------------------------------------
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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 already is checked to be valid, by the graphics kernel.
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;
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; Must set an error code: NO (will be called only if page OK)
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;
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SETDRAWPAGE:
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rts
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; ------------------------------------------------------------------------
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; SETCOLOR: Set the drawing color (in A). The new color already is checked
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; to be in a valid range (0..maxcolor-1).
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;
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; Must set an error code: NO (will be called only if color OK)
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;
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SETCOLOR:
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sta MODE
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rts
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; ------------------------------------------------------------------------
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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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;
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; Must set an error code: YES
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;
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SETPALETTE:
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ldy #0
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jsr flipcolor
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sty PARAM1+1
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jsr PAPER
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ldy #1
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jsr flipcolor
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.assert TGI_ERR_OK = 0, error
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dey
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sty ERROR
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sty PARAM1+1
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jmp INK
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flipcolor:
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lda (ptr1),y
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sta PALETTE,y
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cmp #1
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beq @flip
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cmp #7
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bne @keep
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@flip: eor #1 ^ 7
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@keep: sta PARAM1
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rts
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; ------------------------------------------------------------------------
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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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;
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; Must set an error code: NO
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;
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GETPALETTE:
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lda #<PALETTE
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ldx #>PALETTE
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rts
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; ------------------------------------------------------------------------
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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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;
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; Must set an error code: NO (all drivers must have a default palette)
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;
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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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; ------------------------------------------------------------------------
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; SETPIXEL: Draw one pixel at X1/Y1 = ptr1/ptr2 with the current drawing
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; color. The co-ordinates 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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;
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; Must set an error code: NO
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;
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SETPIXEL:
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lda Y1
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sta PARAM2
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lda MODE
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mymode: sta PARAM3
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lda X1
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add #2 * XSIZE ; Skip screen attribute columns
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sta PARAM1
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lda #>$0000
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sta PARAM1+1
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sta PARAM2+1
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sta PARAM3+1
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jmp CURSET
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; ------------------------------------------------------------------------
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; GETPIXEL: Read the color value of a pixel, and return it in A/X. The
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; co-ordinates 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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lda X1
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sta PARAM1
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lda Y1
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sta PARAM2
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lda #>$0000
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sta PARAM1+1
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sta PARAM2+1
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jsr POINT
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lda PARAM1
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and #%00000001
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ldx #>$0000
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rts
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; ------------------------------------------------------------------------
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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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;
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; Must set an error code: NO
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;
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LINE:
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jsr SETPIXEL
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lda X2
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sub X1
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sta PARAM1
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lda X2+1
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sbc X1+1
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sta PARAM1+1
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lda Y2
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sub Y1
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sta PARAM2
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lda Y2+1
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sbc Y1+1
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sta PARAM2+1
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lda MODE
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sta PARAM3
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ldx #>$0000
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stx PARAM3+1
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jmp DRAW
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; ------------------------------------------------------------------------
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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 co-ordinates 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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;
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; Must set an error code: NO
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;
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BAR:
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inc Y2
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@L1: 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 @L1
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rts
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; ------------------------------------------------------------------------
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; TEXTSTYLE: Set the style used when calling OUTTEXT. Text scaling in the x
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; and y directions is passed in X/Y, the text direction is passed in A.
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;
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; Must set an error code: NO
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;
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TEXTSTYLE:
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rts
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; ------------------------------------------------------------------------
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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 its address in ptr3.
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;
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; Must set an error code: NO
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;
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OUTTEXT:
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lda Y1
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sub #(YSIZE - 1)
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sta PARAM2
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lda #3 ; (Move graphics cursor; don't draw)
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jsr mymode
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ldy #0
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@next: lda (ptr3),y
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beq @end
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sta PARAM1
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lda #0
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sta PARAM2
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sta PARAM1+1
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sta PARAM2+1
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sta PARAM3+1
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lda MODE
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sta PARAM3
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tya
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pha
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jsr CHAR
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lda #XSIZE
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sta PARAM1
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lda #0
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sta PARAM2
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sta PARAM1+1
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sta PARAM2+1
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sta PARAM3+1
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lda #3
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sta PARAM3
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jsr CURMOV
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pla
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tay
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iny
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bne @next
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@end: rts
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