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https://github.com/cc65/cc65.git
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420 lines
9.3 KiB
ArmAsm
420 lines
9.3 KiB
ArmAsm
;
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; Graphics driver for the 240x200x2 mode on the Atmos
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;
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; Stefan Haubenthal <polluks@sdf.lonestar.org>
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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-mode.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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; ------------------------------------------------------------------------
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; Header. Includes jump table and constants.
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.segment "JUMPTABLE"
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; First part of the header is a structure that has a magic and defines the
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; capabilities of the driver
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.byte $74, $67, $69 ; "tgi"
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.byte TGI_API_VERSION ; TGI API version number
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.word 240 ; X resolution
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.word 200 ; Y resolution
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.byte 2 ; Number of drawing colors
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.byte 1 ; Number of screens available
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xsize: .byte 6 ; System font X size
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.byte 8 ; System font Y size
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.res 4, $00 ; Reserved for future extensions
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; Next comes the jump table. Currently all entries must be valid and may point
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; 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 _CIRCLE
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.addr TEXTSTYLE
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.addr OUTTEXT
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.addr 0 ; IRQ entry is unused
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; ------------------------------------------------------------------------
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; Data.
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; Variables mapped to the zero page segment variables. Some of 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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RADIUS = tmp1
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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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; Constants and tables
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PARAM1 = $2E1
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PARAM2 = $2E3
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PARAM3 = $2E5
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TEXT = $EC21
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HIRES = $EC33
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CURSET = $F0C8
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CURMOV = $F0FD
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DRAW = $F110
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CHAR = $F12D
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POINT = $F1C8
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PAPER = $F204
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INK = $F210
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CIRCLE = $F37F
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.rodata
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DEFPALETTE: .byte $00, $07
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.code
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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 is probably 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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; INIT: Changes an already installed device from text mode to graphics
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; 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 only called once, so any code that is needed
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; to initializes variables and so on must go here. Setting palette and
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; clearing the screen is not needed because this is called by the graphics
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; kernel later.
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; The graphics kernel will never 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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lda #TGI_ERR_OK
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sta ERROR
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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 will never 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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; 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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rts
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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 $213
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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 is already checked to be valid by the graphics kernel.
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;
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; Must set an error code: NO (will only be called 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 is already checked to be valid by the graphics kernel.
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;
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; Must set an error code: NO (will only be called 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 is already 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 only be called 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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lda (ptr1),y
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sta PARAM1
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jsr PAPER
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ldy #1
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lda (ptr1),y
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sta PARAM1
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jsr INK
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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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; 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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; ------------------------------------------------------------------------
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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 coordinates 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 MODE
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mymode: sta PARAM3
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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 #0
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sta PARAM1+1
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sta PARAM2+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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; coordinates 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 #0
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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 #0
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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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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 coordinates 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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; CIRCLE: Draw a circle around the center X1/Y1 (= ptr1/ptr2) with the
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; radius in tmp1 and 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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_CIRCLE:
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lda #3
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jsr mymode
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lda RADIUS
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sta PARAM1
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lda MODE
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sta PARAM2
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jmp CIRCLE
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; ------------------------------------------------------------------------
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; TEXTSTYLE: Set the style used when calling OUTTEXT. Text scaling in X and Y
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; direction is passend 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 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 X1
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sta PARAM1
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lda Y1
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sta PARAM2
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lda #3
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sta PARAM3
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jsr CURSET
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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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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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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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