mirror of
https://github.com/cc65/cc65.git
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1108 lines
26 KiB
ArmAsm
1108 lines
26 KiB
ArmAsm
;
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; Graphics driver for the 160x102x16 mode on the Lynx.
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;
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; All the drawing functions are simply done by sprites as the sprite
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; engine is the only way to do fast graphics on a Lynx.
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;
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; So the code is not really based on any algorithms done by somebody.
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; I have looked at other routines in the cc65 libs to see what kind of
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; entry points we need. And I have looked at the old cc65 libs by
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; Bastian Schick to see how things worked in the past.
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;
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; This code is written by Karri Kaksonen, 2004 for the cc65 compiler.
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;
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.include "zeropage.inc"
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.include "extzp.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 "lynx.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 160 ; X resolution
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.word 102 ; Y resolution
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.byte 16 ; Number of drawing colors
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.byte 2 ; Number of screens available
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.byte 8 ; 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). A future version may
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; allow for emulation: In this case the vector will be zero. Emulation means
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; that the graphics kernel will emulate the function by using lower level
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; primitives - for example ploting a line by using calls to SETPIXEL.
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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 IRQ
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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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STRPTR := ptr3
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FONTOFF := ptr4
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STROFF := tmp3
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STRLEN := tmp4
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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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DRAWINDEX: .res 1 ; Pen to use for drawing
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VIEWPAGEL: .res 1
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VIEWPAGEH: .res 1
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DRAWPAGEL: .res 1
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DRAWPAGEH: .res 1
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; Text output stuff
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TEXTMAGX: .res 1
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TEXTMAGY: .res 1
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TEXTDIR: .res 1
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BGINDEX: .res 1 ; Pen to use for text background
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; Double buffer IRQ stuff
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DRAWPAGE: .res 1
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SWAPREQUEST: .res 1
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text_bitmap: .res 8*(1+20+1)+1
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; 8 rows with (one offset-byte plus 20 character bytes plus one fill-byte) plus one 0-offset-byte
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; Constants and tables
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.rodata
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DEFPALETTE: .byte >$000
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.byte >$007
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.byte >$070
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.byte >$700
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.byte >$077
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.byte >$770
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.byte >$707
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.byte >$777
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.byte >$333
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.byte >$00F
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.byte >$0F0
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.byte >$F00
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.byte >$0FF
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.byte >$FF0
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.byte >$F0F
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.byte >$FFF
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.byte <$000
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.byte <$007
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.byte <$070
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.byte <$700
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.byte <$077
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.byte <$770
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.byte <$707
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.byte <$777
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.byte <$333
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.byte <$00F
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.byte <$0F0
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.byte <$F00
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.byte <$0FF
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.byte <$FF0
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.byte <$F0F
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.byte <$FFF
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PALETTESIZE = * - DEFPALETTE
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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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lda #1
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sta TEXTMAGX
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sta TEXTMAGY
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stz BGINDEX
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stz DRAWPAGE
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stz SWAPREQUEST
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rts
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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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; Enable interrupts for VBL
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lda #$80
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tsb VTIMCTLA
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; Set up collision buffer to $A058
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lda #$58
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sta COLLBASL
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lda #$A0
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sta COLLBASH
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; Put collision index before sprite data
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lda #$FE
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sta COLLOFFL
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lda #$FF
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sta COLLOFFH
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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:
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rts
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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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; The TGI lacks a way to draw sprites. As that functionality is vital to
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; Lynx games we borrow this CONTROL function to implement the still
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; missing tgi_draw_sprite funtion. To use this in your C-program
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; do a #define tgi_draw_sprite(spr) tgi_ioctl(0, spr)
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;
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; To do a flip-screen call tgi_ioctl(1, 0)
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;
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; To set the background index for text outputs call tgi_ioctl(2, bgindex)
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;
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; To set the frame rate for the display hardware call tgi_ioctl(3, rate)
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;
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; To check if the drawing engine is busy with the previous swap you can
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; call tgi_ioctl(4, 0). It returns 0 if idle and 1 if busy
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;
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; To update displays you can call tgi_ioctl(4, 1) it will wait for the
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; next VBL interrupt and swap draw and view buffers.
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;
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; Activate or deactivate collision detection by calling tgi_ioctl(5, 0/1).
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CONTROL:
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pha ; Almost all control routines succeed
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lda #TGI_ERR_OK
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sta ERROR
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pla
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cmp #5
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bne ControlSwap
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lda ptr1
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bne @L0
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lda __sprsys
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ora #$20
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bra @L1
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@L0: lda __sprsys
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and #$df
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@L1: sta __sprsys
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sta SPRSYS
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rts
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ControlSwap:
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cmp #4
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bne ControlFramerate
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lda ptr1 ; Swap request
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bne @L0
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lda SWAPREQUEST
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rts
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@L0: sta SWAPREQUEST
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rts
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ControlFramerate:
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cmp #3
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bne ControlTextBG
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lda ptr1
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cmp #75 ; Set framerate
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beq rate75
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cmp #60
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beq rate60
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cmp #50
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beq rate50
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lda #TGI_ERR_INV_ARG
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sta ERROR
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rts
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rate50: lda #$bd ; 50 Hz
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ldx #$31
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bra setRate
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rate60: lda #$9e ; 60 Hz
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ldx #$29
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bra setRate
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rate75: lda #$7e ; 75 Hz
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ldx #$20
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setRate:
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sta HTIMBKUP
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stx PBKUP
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rts
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ControlTextBG:
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cmp #2
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bne ControlFlipScreen
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lda ptr1 ; Set text background color
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sta BGINDEX
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rts
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ControlFlipScreen:
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cmp #1
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bne ControlDrawSprite
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lda __sprsys ; Flip screen
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eor #8
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sta __sprsys
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sta SPRSYS
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lda __viddma
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eor #2
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sta __viddma
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sta DISPCTL
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ldy VIEWPAGEL
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ldx VIEWPAGEH
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and #2
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beq NotFlipped
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clc
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tya
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adc #<8159
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tay
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txa
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adc #>8159
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tax
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NotFlipped:
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sty DISPADRL
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stx DISPADRH
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rts
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ControlDrawSprite:
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lda ptr1 ; Get the sprite address
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ldx ptr1+1
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draw_sprite: ; Draw it in render buffer
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sta SCBNEXTL
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stx SCBNEXTH
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lda DRAWPAGEL
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ldx DRAWPAGEH
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sta VIDBASL
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stx VIDBASH
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lda #1
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sta SPRGO
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stz SDONEACK
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@L0: stz CPUSLEEP
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lda SPRSYS
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lsr
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bcs @L0
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stz SDONEACK
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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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.rodata
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pixel_bitmap:
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.byte 3,%10000100,%00000000, $0 ; A pixel bitmap
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cls_sprite:
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.byte %00000001 ; A pixel sprite
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.byte %00010000
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.byte %00100000
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.addr 0,pixel_bitmap
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.word 0
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.word 0
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.word $a000 ; 160
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.word $6600 ; 102
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.byte $00
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.code
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CLEAR: lda #<cls_sprite
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ldx #>cls_sprite
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bra draw_sprite
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; ------------------------------------------------------------------------
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; SETVIEWPAGE: Set the visible page. Called with the new page in A (0..n).
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; The page number is already checked to be valid by the graphics kernel.
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;
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; Must set an error code: NO (will only be called if page ok)
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;
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; It is a good idea to call this function during the vertical blanking
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; period. If you call it in the middle of the screen update then half of
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; the drawn frame will be from the old buffer and the other half is
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; from the new buffer. This is usually noticed by the user.
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SETVIEWPAGE:
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cmp #1
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beq @L1 ; page == maxpages-1
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ldy #<$e018 ; page 0
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ldx #>$e018
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bra @L2
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@L1:
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ldy #<$c038 ; page 1
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ldx #>$c038
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@L2:
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sty VIEWPAGEL ; Save viewpage for getpixel
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stx VIEWPAGEH
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lda __viddma ; Process flipped displays
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and #2
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beq @L3
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clc
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tya
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adc #<8159
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tay
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txa
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adc #>8159
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tax
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@L3:
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sty DISPADRL ; $FD94
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stx DISPADRH ; $FD95
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rts
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; ------------------------------------------------------------------------
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; SETDRAWPAGE: Set the drawable page. Called with the new page in A (0..n).
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; The page number is already checked to be valid by the graphics kernel.
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;
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; Must set an error code: NO (will only be called if page ok)
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;
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SETDRAWPAGE:
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cmp #1
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beq @L1 ; page == maxpages-1
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lda #<$e018 ; page 0
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ldx #>$e018
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bra @L2
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@L1:
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lda #<$c038 ; page 1
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ldx #>$c038
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@L2:
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sta DRAWPAGEL
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stx DRAWPAGEH
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rts
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; ------------------------------------------------------------------------
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; IRQ: VBL interrupt handler
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;
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IRQ:
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lda INTSET ; Poll all pending interrupts
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and #VBL_INTERRUPT
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beq IRQEND ; Exit if not a VBL interrupt
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lda SWAPREQUEST
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beq @L0
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lda DRAWPAGE
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jsr SETVIEWPAGE
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lda DRAWPAGE
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eor #1
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sta DRAWPAGE
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jsr SETDRAWPAGE
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stz SWAPREQUEST
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@L0:
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IRQEND:
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clc
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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 DRAWINDEX
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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 #31
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@L1: lda (ptr1),y
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sta GCOLMAP,y ; $FDA0
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dey
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bpl @L1
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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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; 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 #<GCOLMAP ; $FDA0
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ldx #>GCOLMAP
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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 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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.data
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pixel_sprite:
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.byte %00000001 ; A pixel sprite
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.byte %00010000
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.byte %00100000
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.addr 0,pixel_bitmap
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pix_x: .word 0
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pix_y: .word 0
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.word $100
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.word $100
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pix_c: .byte $00
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.code
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SETPIXEL:
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lda X1
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sta pix_x
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lda Y1
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sta pix_y
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lda DRAWINDEX
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sta pix_c
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lda #<pixel_sprite
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ldx #>pixel_sprite
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jmp draw_sprite
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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
|
|
; area, so there is no need for clipping inside this function.
|
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|
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|
GETPIXEL:
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lda Y1
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sta MATHD ; Hardware multiply
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stz MATHC
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lda #80
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sta MATHB
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stz MATHA
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lda X1
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lsr A
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php
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tay
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clc
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lda VIEWPAGEL
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adc MATHH
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|
sta ptr1
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|
lda VIEWPAGEH
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|
adc MATHG
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sta ptr1+1
|
|
|
|
ldx #0
|
|
lda #15
|
|
sta MAPCTL
|
|
lda (ptr1),y
|
|
tay
|
|
lda #$0c
|
|
sta MAPCTL
|
|
tya
|
|
plp
|
|
bcc @L1
|
|
and #$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.
|
|
;
|
|
; Must set an error code: NO
|
|
;
|
|
|
|
.data
|
|
line_sprite:
|
|
.byte 0 ; Will be replaced by the code
|
|
.byte %00110000
|
|
.byte %00100000
|
|
.word 0,pixel_bitmap
|
|
line_x:
|
|
.word 0
|
|
line_y:
|
|
.word 0
|
|
line_sx:
|
|
.word $100
|
|
line_sy:
|
|
.word $100
|
|
.word 0
|
|
line_tilt:
|
|
.word 0
|
|
line_c:
|
|
.byte $e
|
|
|
|
.code
|
|
LINE:
|
|
lda DRAWINDEX
|
|
sta line_c
|
|
stz line_sx
|
|
stz line_sy
|
|
|
|
sec
|
|
lda X2
|
|
sbc X1
|
|
lda X2+1
|
|
sbc X1+1
|
|
bpl @L1
|
|
lda X1
|
|
ldx X2
|
|
sta X2
|
|
stx X1
|
|
lda X1+1
|
|
ldx X2+1
|
|
sta X2+1
|
|
stx X1+1
|
|
lda Y1
|
|
ldx Y2
|
|
sta Y2
|
|
stx Y1
|
|
lda Y1+1
|
|
ldx Y2+1
|
|
sta Y2+1
|
|
stx Y1+1
|
|
@L1:
|
|
lda #%00000000 ; Not flipped
|
|
sta line_sprite
|
|
|
|
sec
|
|
lda Y2
|
|
sbc Y1
|
|
sta Y2
|
|
lda Y2+1
|
|
sbc Y1+1
|
|
sta Y2+1
|
|
bpl @L2
|
|
sec
|
|
lda #0
|
|
sbc Y2
|
|
sta Y2
|
|
lda #0
|
|
sbc Y2+1
|
|
sta Y2+1
|
|
lda #%00010000 ; Vertical flip
|
|
sta line_sprite
|
|
@L2:
|
|
lda X1
|
|
sta line_x
|
|
lda X1+1
|
|
sta line_x+1
|
|
lda Y1
|
|
sta line_y
|
|
lda Y1+1
|
|
sta line_y+1
|
|
|
|
lda Y2
|
|
ina
|
|
sta line_sy+1
|
|
sta MATHP ; hardware divide
|
|
stz MATHN
|
|
|
|
stz MATHH
|
|
stz MATHG
|
|
sec
|
|
lda X2
|
|
sbc X1
|
|
ina
|
|
sta MATHF
|
|
stz MATHE
|
|
@L3:
|
|
lda SPRSYS
|
|
bmi @L3 ; wait for math done (bit 7 of sprsys)
|
|
lda MATHC
|
|
sta line_tilt
|
|
lda MATHB
|
|
sta line_tilt+1
|
|
bne @L4
|
|
lda #1
|
|
sta line_sx+1
|
|
bra @L6
|
|
@L4:
|
|
bit line_tilt
|
|
bpl @L5
|
|
ina
|
|
@L5:
|
|
sta line_sx+1
|
|
@L6:
|
|
lda #<line_sprite
|
|
ldx #>line_sprite
|
|
jmp draw_sprite
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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
|
|
ina
|
|
sta bar_sx+1
|
|
lda Y2
|
|
sec
|
|
sbc Y1
|
|
ina
|
|
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
|
|
;
|
|
; There is no sensible way of drawing a circle on a Lynx. As I would
|
|
; have to use line elements to do the circle I rather do it in C than
|
|
; create it here in the driver.
|
|
|
|
; To do a circle please add this to your C program
|
|
|
|
;int sintbl[9] = {
|
|
; 0, // 0 degrees
|
|
; 3196, // 11.25 degrees
|
|
; 6270, // 22.5 degrees
|
|
; 9102, // 33.75 degrees
|
|
; 11585, // 45 degrees
|
|
; 13623, // 56.25 degrees
|
|
; 15137, // 67.5 degrees
|
|
; 16069, // 78.75 degrees
|
|
; 16384 // 90 degrees
|
|
;};
|
|
|
|
;int sin(char d)
|
|
;{
|
|
; char neg;
|
|
; d = d & 31;
|
|
; neg = d > 16;
|
|
; d = d & 15;
|
|
; if (d > 8)
|
|
; d = 16 - d;
|
|
; if (neg)
|
|
; return -sintbl[d];
|
|
; else
|
|
; return sintbl[d];
|
|
;}
|
|
|
|
;void tgi_Circle(int x0, int y0, unsigned char r)
|
|
;{
|
|
; char i;
|
|
; int x1, y1, x2, y2;
|
|
;
|
|
; x1 = ((long)sin(0) * r + 8192) / 16384 + x0;
|
|
; y1 = ((long)sin(8) * r + 8192) / 16384 + y0;
|
|
; for (i = 1; i <= 32; i++) {
|
|
; x2 = ((long)sin(i) * r + 8192) / 16384 + x0;
|
|
; y2 = ((long)sin(i+8) * r + 8192) / 16384 + y0;
|
|
; tgi_line(x1, y1, x2, y2);
|
|
; x1 = x2;
|
|
; y1 = y2;
|
|
; }
|
|
;}
|
|
|
|
;#define tgi_circle tgi_Circle
|
|
|
|
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:
|
|
lda TEXTMAGX ; Scale sprite
|
|
sta text_sx+1
|
|
lda TEXTMAGY
|
|
sta text_sy+1
|
|
|
|
stz text_sprite ; Set normal sprite
|
|
lda BGINDEX
|
|
bne @L1
|
|
lda #4
|
|
sta text_sprite ; Set opaque sprite
|
|
@L1:
|
|
lda DRAWINDEX ; Set color
|
|
asl
|
|
asl
|
|
asl
|
|
asl
|
|
ora BGINDEX
|
|
sta text_c
|
|
|
|
lda X1 ; Set start position
|
|
sta text_x
|
|
lda X1+1
|
|
sta text_x+1
|
|
lda Y1
|
|
sta text_y
|
|
lda Y1+1
|
|
sta text_y+1
|
|
|
|
ldy #-1 ; Calculate string length
|
|
@L2:
|
|
iny
|
|
lda (STRPTR),y
|
|
bne @L2
|
|
cpy #20
|
|
bmi @L3
|
|
ldy #20
|
|
@L3:
|
|
sty STRLEN
|
|
bne @L4
|
|
rts ; Zero length string
|
|
@L4:
|
|
iny ; Prepare text_bitmap
|
|
iny
|
|
sty STROFF
|
|
|
|
ldy #8-1 ; 8 pixel lines per character
|
|
ldx #0
|
|
clc
|
|
@L5:
|
|
lda STROFF
|
|
sta text_bitmap,x
|
|
txa
|
|
adc STROFF
|
|
tax
|
|
lda #$ff
|
|
sta text_bitmap-1,x
|
|
dey
|
|
bpl @L5
|
|
stz text_bitmap,x
|
|
|
|
stz tmp2
|
|
iny
|
|
@L6:
|
|
lda (STRPTR),y
|
|
sty tmp1
|
|
|
|
sec ; (ch-' ') * 8
|
|
sbc #32
|
|
stz FONTOFF
|
|
stz FONTOFF+1
|
|
asl
|
|
asl
|
|
rol FONTOFF+1
|
|
asl
|
|
rol FONTOFF+1
|
|
clc ; Choose font
|
|
adc #<font
|
|
sta FONTOFF
|
|
lda FONTOFF+1
|
|
adc #>font
|
|
sta FONTOFF+1
|
|
|
|
; and now copy the 8 bytes of that char
|
|
|
|
ldx tmp2
|
|
inx
|
|
stx tmp2
|
|
|
|
; draw char from top to bottom, reading char-data from offset 8-1 to offset 0
|
|
ldy #8-1
|
|
@L7:
|
|
lda (FONTOFF),y ; *chptr
|
|
sta text_bitmap,x ;textbuf[y*(1+len+1)+1+x]
|
|
|
|
txa
|
|
adc STROFF
|
|
tax
|
|
|
|
dey
|
|
bpl @L7
|
|
|
|
; goto next char
|
|
ldy tmp1
|
|
iny
|
|
dec STRLEN
|
|
bne @L6
|
|
|
|
lda #<text_sprite
|
|
ldx #>text_sprite
|
|
jmp draw_sprite
|
|
|
|
.data
|
|
text_sprite:
|
|
.byte $00,$90,$20
|
|
.addr 0, text_bitmap
|
|
text_x:
|
|
.word 0
|
|
text_y:
|
|
.word 0
|
|
text_sx:
|
|
.word $100
|
|
text_sy:
|
|
.word $100
|
|
text_c:
|
|
.byte 0
|
|
|
|
.rodata
|
|
; The Font
|
|
; 96 characters from ASCII 32 to 127
|
|
; 8 pixels wide, 8 pixels high
|
|
; bit value 0 = foreground, bit value 1 = background / transparent
|
|
font:
|
|
; VERSAIL
|
|
.byte $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF ;32
|
|
.byte $FF, $E7, $FF, $FF, $E7, $E7, $E7, $E7 ;33
|
|
.byte $FF, $FF, $FF, $FF, $FF, $99, $99, $99 ;34
|
|
.byte $FF, $99, $99, $00, $99, $00, $99, $99 ;35
|
|
.byte $FF, $E7, $83, $F9, $C3, $9F, $C1, $E7 ;36
|
|
.byte $FF, $B9, $99, $CF, $E7, $F3, $99, $9D ;37
|
|
.byte $FF, $C0, $99, $98, $C7, $C3, $99, $C3 ;38
|
|
.byte $FF, $FF, $FF, $FF, $FF, $E7, $F3, $F9 ;39
|
|
.byte $FF, $F3, $E7, $CF, $CF, $CF, $E7, $F3 ;40
|
|
.byte $FF, $CF, $E7, $F3, $F3, $F3, $E7, $CF ;41
|
|
.byte $FF, $FF, $99, $C3, $00, $C3, $99, $FF ;42
|
|
.byte $FF, $FF, $E7, $E7, $81, $E7, $E7, $FF ;43
|
|
.byte $CF, $E7, $E7, $FF, $FF, $FF, $FF, $FF ;44
|
|
.byte $FF, $FF, $FF, $FF, $81, $FF, $FF, $FF ;45
|
|
.byte $FF, $E7, $E7, $FF, $FF, $FF, $FF, $FF ;46
|
|
.byte $FF, $9F, $CF, $E7, $F3, $F9, $FC, $FF ;47
|
|
.byte $FF, $C3, $99, $99, $89, $91, $99, $C3 ;48
|
|
.byte $FF, $81, $E7, $E7, $E7, $C7, $E7, $E7 ;49
|
|
.byte $FF, $81, $9F, $CF, $F3, $F9, $99, $C3 ;50
|
|
.byte $FF, $C3, $99, $F9, $E3, $F9, $99, $C3 ;51
|
|
.byte $FF, $F9, $F9, $80, $99, $E1, $F1, $F9 ;52
|
|
.byte $FF, $C3, $99, $F9, $F9, $83, $9F, $81 ;53
|
|
.byte $FF, $C3, $99, $99, $83, $9F, $99, $C3 ;54
|
|
.byte $FF, $E7, $E7, $E7, $E7, $F3, $99, $81 ;55
|
|
.byte $FF, $C3, $99, $99, $C3, $99, $99, $C3 ;56
|
|
.byte $FF, $C3, $99, $F9, $C1, $99, $99, $C3 ;57
|
|
.byte $FF, $FF, $E7, $FF, $FF, $E7, $FF, $FF ;58
|
|
.byte $CF, $E7, $E7, $FF, $FF, $E7, $FF, $FF ;59
|
|
.byte $FF, $F1, $E7, $CF, $9F, $CF, $E7, $F1 ;60
|
|
.byte $FF, $FF, $FF, $81, $FF, $81, $FF, $FF ;61
|
|
.byte $FF, $8F, $E7, $F3, $F9, $F3, $E7, $8F ;62
|
|
.byte $FF, $E7, $FF, $E7, $F3, $F9, $99, $C3 ;63
|
|
|
|
|
|
.byte $FF, $C3, $9D, $9F, $91, $91, $99, $C3 ;0
|
|
.byte $FF, $99, $99, $99, $81, $99, $C3, $E7 ;1
|
|
.byte $FF, $83, $99, $99, $83, $99, $99, $83 ;2
|
|
.byte $FF, $C3, $99, $9F, $9F, $9F, $99, $C3 ;3
|
|
.byte $FF, $87, $93, $99, $99, $99, $93, $87 ;4
|
|
.byte $FF, $81, $9F, $9F, $87, $9F, $9F, $81 ;5
|
|
.byte $FF, $9F, $9F, $9F, $87, $9F, $9F, $81 ;6
|
|
.byte $FF, $C3, $99, $99, $91, $9F, $99, $C3 ;7
|
|
.byte $FF, $99, $99, $99, $81, $99, $99, $99 ;8
|
|
.byte $FF, $C3, $E7, $E7, $E7, $E7, $E7, $C3 ;9
|
|
.byte $FF, $C7, $93, $F3, $F3, $F3, $F3, $E1 ;10
|
|
.byte $FF, $99, $93, $87, $8F, $87, $93, $99 ;11
|
|
.byte $FF, $81, $9F, $9F, $9F, $9F, $9F, $9F ;12
|
|
.byte $FF, $9C, $9C, $9C, $94, $80, $88, $9C ;13
|
|
.byte $FF, $99, $99, $91, $81, $81, $89, $99 ;14
|
|
.byte $FF, $C3, $99, $99, $99, $99, $99, $C3 ;15
|
|
.byte $FF, $9F, $9F, $9F, $83, $99, $99, $83 ;16
|
|
.byte $FF, $F1, $C3, $99, $99, $99, $99, $C3 ;17
|
|
.byte $FF, $99, $93, $87, $83, $99, $99, $83 ;18
|
|
.byte $FF, $C3, $99, $F9, $C3, $9F, $99, $C3 ;19
|
|
.byte $FF, $E7, $E7, $E7, $E7, $E7, $E7, $81 ;20
|
|
.byte $FF, $C3, $99, $99, $99, $99, $99, $99 ;21
|
|
.byte $FF, $E7, $C3, $99, $99, $99, $99, $99 ;22
|
|
.byte $FF, $9C, $88, $80, $94, $9C, $9C, $9C ;23
|
|
.byte $FF, $99, $99, $C3, $E7, $C3, $99, $99 ;24
|
|
.byte $FF, $E7, $E7, $E7, $C3, $99, $99, $99 ;25
|
|
.byte $FF, $81, $9F, $CF, $E7, $F3, $F9, $81 ;26
|
|
.byte $FF, $C3, $CF, $CF, $CF, $CF, $CF, $C3 ;27
|
|
.byte $FF, $03, $9D, $CF, $83, $CF, $ED, $F3 ;28
|
|
.byte $FF, $C3, $F3, $F3, $F3, $F3, $F3, $C3 ;29
|
|
.byte $E7, $E7, $E7, $E7, $81, $C3, $E7, $FF ;30
|
|
.byte $FF, $EF, $CF, $80, $80, $CF, $EF, $FF ;31
|
|
|
|
|
|
; gemena
|
|
.byte $FF, $C3, $9D, $9F, $91, $91, $99, $C3 ;224
|
|
.byte $FF, $C1, $99, $C1, $F9, $C3, $FF, $FF ;225
|
|
.byte $FF, $83, $99, $99, $83, $9F, $9F, $FF ;226
|
|
.byte $FF, $C3, $9F, $9F, $9F, $C3, $FF, $FF ;227
|
|
.byte $FF, $C1, $99, $99, $C1, $F9, $F9, $FF ;228
|
|
.byte $FF, $C3, $9F, $81, $99, $C3, $FF, $FF ;229
|
|
.byte $FF, $E7, $E7, $E7, $C1, $E7, $F1, $FF ;230
|
|
.byte $83, $F9, $C1, $99, $99, $C1, $FF, $FF ;231
|
|
.byte $FF, $99, $99, $99, $83, $9F, $9F, $FF ;232
|
|
.byte $FF, $C3, $E7, $E7, $C7, $FF, $E7, $FF ;233
|
|
.byte $C3, $F9, $F9, $F9, $F9, $FF, $F9, $FF ;234
|
|
.byte $FF, $99, $93, $87, $93, $9F, $9F, $FF ;235
|
|
.byte $FF, $C3, $E7, $E7, $E7, $E7, $C7, $FF ;236
|
|
.byte $FF, $9C, $94, $80, $80, $99, $FF, $FF ;237
|
|
.byte $FF, $99, $99, $99, $99, $83, $FF, $FF ;238
|
|
.byte $FF, $C3, $99, $99, $99, $C3, $FF, $FF ;239
|
|
.byte $9F, $9F, $83, $99, $99, $83, $FF, $FF ;240
|
|
.byte $F9, $F9, $C1, $99, $99, $C1, $FF, $FF ;241
|
|
.byte $FF, $9F, $9F, $9F, $99, $83, $FF, $FF ;242
|
|
.byte $FF, $83, $F9, $C3, $9F, $C1, $FF, $FF ;243
|
|
.byte $FF, $F1, $E7, $E7, $E7, $81, $E7, $FF ;244
|
|
.byte $FF, $C1, $99, $99, $99, $99, $FF, $FF ;245
|
|
.byte $FF, $E7, $C3, $99, $99, $99, $FF, $FF ;246
|
|
.byte $FF, $C9, $C1, $80, $94, $9C, $FF, $FF ;247
|
|
.byte $FF, $99, $C3, $E7, $C3, $99, $FF, $FF ;248
|
|
.byte $87, $F3, $C1, $99, $99, $99, $FF, $FF ;249
|
|
.byte $FF, $81, $CF, $E7, $F3, $81, $FF, $FF ;250
|
|
.byte $FF, $C3, $CF, $CF, $CF, $CF, $CF, $C3 ;251
|
|
.byte $FF, $03, $9D, $CF, $83, $CF, $ED, $F3 ;252
|
|
.byte $FF, $C3, $F3, $F3, $F3, $F3, $F3, $C3 ;253
|
|
.byte $E7, $E7, $E7, $E7, $81, $C3, $E7, $FF ;254
|
|
.byte $FF, $EF, $CF, $80, $80, $CF, $EF, $FF ;255
|