mirror of
https://github.com/cc65/cc65.git
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Merge pull request #706 from xlar54/master
* tgi driver for c128 VIC-II * Made the VIC-IIe TGI driver put its bitmap behind the ROMs. * c128-hi.tgi doc
This commit is contained in:
greg-king5
GitHub
commit
a08192b53e
@ -16,6 +16,8 @@ FNAM_BANK := $C7 ; Bank for filename
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KEY_COUNT := $D0 ; Number of keys in input buffer
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FKEY_COUNT := $D1 ; Characters for function key
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MODE := $D7 ; 40-/80-column mode (bit 7: 80 columns)
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GRAPHM := $D8 ; Graphics mode flags (bits 5-7)
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CHARDIS := $D9 ; Bit 2 shadow for location $01
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CURS_X := $EC ; Cursor column
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CURS_Y := $EB ; Cursor row
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SCREEN_PTR := $E0 ; Pointer to current char in text screen
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@ -25,22 +27,23 @@ CHARCOLOR := $F1
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RVS := $F3 ; Reverse output flag
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SCROLL := $F8 ; Disable scrolling flag
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BASIC_BUF := $200 ; Location of command-line
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BASIC_BUF := $0200 ; Location of command-line
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BASIC_BUF_LEN = 162 ; Maximum length of command-line
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FETCH := $2A2 ; Fetch subroutine in RAM
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FETVEC := $2AA ; Vector patch location for FETCH
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STASH := $2AF ; Stash routine in RAM
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STAVEC := $2B9 ; Vector patch location for STASH
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IRQInd := $2FD ; JMP $0000 -- used as indirect IRQ vector
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PALFLAG := $A03 ; $FF=PAL, $00=NTSC
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INIT_STATUS := $A04 ; Flags: Reset/Restore initiation status
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FETCH := $02A2 ; Fetch subroutine in RAM
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FETVEC := $02AA ; Vector patch location for FETCH
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STASH := $02AF ; Stash routine in RAM
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STAVEC := $02B9 ; Vector patch location for STASH
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IRQInd := $02FD ; JMP $0000 -- used as indirect IRQ vector
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PALFLAG := $0A03 ; $FF=PAL, $00=NTSC
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INIT_STATUS := $0A04 ; Flags: Reset/Restore initiation status
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VM2 := $0A2D ; VIC-IIe shadow for $D018 -- graphics mode
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FKEY_LEN := $1000 ; Function key lengths
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FKEY_TEXT := $100A ; Function key texts
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KBDREPEAT := $28a
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KBDREPEATRATE := $28b
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KBDREPEATDELAY := $28c
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KBDREPEAT := $028a
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KBDREPEATRATE := $028b
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KBDREPEATDELAY := $028c
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; ---------------------------------------------------------------------------
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; Kernal routines
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@ -200,13 +200,13 @@ memory drivers using the VDC memory!
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<descrip>
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<tag><tt/c128-vdc.tgi (c128_vdc_tgi)/</tag>
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This driver was written by Maciej Witkowiak. It uses the 80-column display,
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and features a resolution of 640*200 with two colors and an adjustable
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and features a resolution of 640×200 with two colors and an adjustable
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palette (that means that the two colors can be chosen out of the 16 VDC
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colors).
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<tag><tt/c128-vdc2.tgi (c128_vdc2_tgi)/</tag>
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This driver was written by Maciej Witkowiak. This driver uses the 80-column
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display, and features a resolution of 640*480 with two colors and an
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display, and features a resolution of 640×480 with two colors and an
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adjustable palette (that means that the two colors can be chosen out of the
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16 VDC colors). The driver requires 64KB VDC RAM.
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</descrip><p>
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@ -215,6 +215,15 @@ Note: The colors are translated from definitions in headers to correct VDC value
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so, please use definitions or VIC color numbers only. Colors <tt/GRAY3/ and <tt/BROWN/ are
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missing on VDC, and are translated to the two colors missing from the VIC palette.
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<descrip>
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<tag><tt/c128-hi.tgi (c128_hi_tgi)/</tag>
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This driver features a resolution of 320×200 with two colors and an
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adjustable palette (that means that the two colors can be chosen out of a
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palette of the 16 VIC colors). Unlike BASIC 7.0 this driver put its graphics
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data into the RAM behind the ROMs.
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</descrip><p>
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<sect1>Extended memory drivers<p>
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<descrip>
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@ -141,6 +141,7 @@ extern void c128_joy_mou[];
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extern void c128_inkwell_mou[];
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extern void c128_pot_mou[];
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extern void c128_swlink_ser[];
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extern void c128_hi_tgi[];
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extern void c128_vdc_tgi[]; /* Referred to by tgi_static_stddrv[] */
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extern void c128_vdc2_tgi[];
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880
libsrc/c128/tgi/c128-hi.s
Normal file
880
libsrc/c128/tgi/c128-hi.s
Normal file
@ -0,0 +1,880 @@
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;
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; Graphics driver for the 320x200x2 mode on the C128.
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;
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; Based on Stephen L. Judd's GRLIB code.
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;
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; 2018-03-13, Sven Klose
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; 2018-07-22, Scott Hutter
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; 2018-07-28, Greg King
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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 "c128.inc"
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.macpack generic
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.macpack module
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; ------------------------------------------------------------------------
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; Header. Includes jump table and constants.
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module_header _c128_hi_tgi
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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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.addr $0000 ; Library reference
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.word 320 ; 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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.byte 8 ; System font X size
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.byte 8 ; System font Y size
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.word $00D4 ; 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. With the exception of IRQ, all entries must be
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; valid 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. 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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TEXT := ptr3
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TEMP := tmp4
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TEMP2 := sreg
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POINT := regsave
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CHUNK := X2 ; Used in the line routine
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OLDCHUNK := X2+1 ; Ditto
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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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PALETTE: .res 2 ; The current palette
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BITMASK: .res 1 ; $00 = clear, $FF = set pixels
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; Line routine stuff
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DX: .res 2
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DY: .res 2
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; BAR variables
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X1SAVE: .res 2
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Y1SAVE: .res 1
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X2SAVE: .res 2
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Y2SAVE: .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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; Constants and tables
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.rodata
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DEFPALETTE: .byte $00, $01 ; White on black
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PALETTESIZE = * - DEFPALETTE
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BITTAB: .byte $80,$40,$20,$10,$08,$04,$02,$01
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BITCHUNK: .byte $FF,$7F,$3F,$1F,$0F,$07,$03,$01
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CHARROM := $D000 ; Character ROM base address
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VBASE := $C000 ; Video memory base address
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CBASE := $E000 ; Color memory base address
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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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; rts ; fall through
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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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; Initialize variables.
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ldx #$FF ; Foreground color
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stx BITMASK
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; Switch into graphics mode.
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; Select a video bank:
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; bank 0 = $03 ($0000-$3FFF) (default)
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; bank 1 = $02 ($4000-$7FFF)
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; bank 2 = $01 ($8000-$BFFF)
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; bank 3 = $00 ($C000-$FFFF) (TGI)
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lda CIA2_PRA
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and #<~$03 ; Bank 3
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sta CIA2_PRA
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lda #$80 ; color-map at $E000, bitmap at $C000
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sta VM2
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; Make the VIC-IIe read RAM instead of the font ROM.
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lda #%00000100
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sta CHARDIS
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; Switch to bitmap mode.
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lda #%00100000
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sta GRAPHM
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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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; Select the text video bank.
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lda CIA2_PRA
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ora #$03 ; Bank 0
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sta CIA2_PRA
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; Make the VIC-IIe read the font ROM instead of RAM.
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lda #%00000000
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sta CHARDIS
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;lda #%00000000 ; Switch back to text mode
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sta GRAPHM
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; Restore a value that's needed by BASIC's GRAPHIC 1 statement.
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lda #$78 ; color-map at $1C00, bitmap at $2000
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sta VM2
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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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CONTROL:
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lda #TGI_ERR_INV_FUNC
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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:
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ldy #$00
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tya
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ldx #MMU_CFG_RAM0
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sei
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stx MMU_CR
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@L1: sta VBASE+$0000,y
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sta VBASE+$0100,y
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sta VBASE+$0200,y
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sta VBASE+$0300,y
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sta VBASE+$0400,y
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sta VBASE+$0500,y
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sta VBASE+$0600,y
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sta VBASE+$0700,y
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sta VBASE+$0800,y
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sta VBASE+$0900,y
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sta VBASE+$0A00,y
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sta VBASE+$0B00,y
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sta VBASE+$0C00,y
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sta VBASE+$0D00,y
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sta VBASE+$0E00,y
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sta VBASE+$0F00,y
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sta VBASE+$1000,y
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sta VBASE+$1100,y
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sta VBASE+$1200,y
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sta VBASE+$1300,y
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sta VBASE+$1400,y
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sta VBASE+$1500,y
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sta VBASE+$1600,y
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sta VBASE+$1700,y
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sta VBASE+$1800,y
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sta VBASE+$1900,y
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sta VBASE+$1A00,y
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sta VBASE+$1B00,y
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sta VBASE+$1C00,y
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sta VBASE+$1D00,y
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sta VBASE+$1E00,y
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sta VBASE+$1F00,y
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iny
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bne @L1
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ldx #MMU_CFG_CC65
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stx MMU_CR
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cli
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rts
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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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|
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SETVIEWPAGE:
|
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; rts ; fall through
|
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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.
|
||||
;
|
||||
; Must set an error code: NO (will only be called if page ok)
|
||||
;
|
||||
|
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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
|
||||
; to be in a valid range (0..maxcolor-1).
|
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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:
|
||||
tax
|
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beq @L1
|
||||
lda #$FF
|
||||
@L1: sta BITMASK
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; SETPALETTE: Set the palette (not available with all drivers/hardware).
|
||||
; A pointer to the palette is passed in ptr1. Must set an error if palettes
|
||||
; are not supported
|
||||
;
|
||||
; Must set an error code: YES
|
||||
;
|
||||
|
||||
SETPALETTE:
|
||||
ldy #PALETTESIZE - 1
|
||||
@L1: lda (ptr1),y ; Copy the palette
|
||||
and #$0F ; Make a valid color
|
||||
sta PALETTE,y
|
||||
dey
|
||||
bpl @L1
|
||||
|
||||
; Get the color entries from the palette
|
||||
|
||||
lda PALETTE+1 ; Foreground color
|
||||
asl a
|
||||
asl a
|
||||
asl a
|
||||
asl a
|
||||
ora PALETTE ; Background color
|
||||
|
||||
; Initialize the color map with the new color settings (it is below the
|
||||
; Kernal ROM).
|
||||
|
||||
ldy #$00
|
||||
ldx #MMU_CFG_RAM0
|
||||
sei
|
||||
stx MMU_CR
|
||||
@L2: sta CBASE+$0000,y
|
||||
sta CBASE+$0100,y
|
||||
sta CBASE+$0200,y
|
||||
sta CBASE+$02e8,y
|
||||
iny
|
||||
bne @L2
|
||||
ldx #MMU_CFG_CC65
|
||||
stx MMU_CR
|
||||
cli
|
||||
|
||||
; Done, reset the error code
|
||||
|
||||
lda #TGI_ERR_OK
|
||||
sta ERROR
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; GETPALETTE: Return the current palette in A/X. Even drivers that cannot
|
||||
; set the palette should return the default palette here, so there's no
|
||||
; way for this function to fail.
|
||||
;
|
||||
; Must set an error code: NO
|
||||
;
|
||||
|
||||
GETPALETTE:
|
||||
lda #<PALETTE
|
||||
ldx #>PALETTE
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; GETDEFPALETTE: Return the default palette for the driver in A/X. All
|
||||
; drivers should return something reasonable here, even drivers that don't
|
||||
; support palettes, otherwise the caller has no way to determine the colors
|
||||
; of the (not changeable) palette.
|
||||
;
|
||||
; Must set an error code: NO (all drivers must have a default palette)
|
||||
;
|
||||
|
||||
GETDEFPALETTE:
|
||||
lda #<DEFPALETTE
|
||||
ldx #>DEFPALETTE
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; SETPIXEL: Draw one pixel at X1/Y1 = ptr1/ptr2 with the current drawing
|
||||
; color. The coordinates passed to this function are never outside the
|
||||
; visible screen area, so there is no need for clipping inside this function.
|
||||
;
|
||||
; Must set an error code: NO
|
||||
;
|
||||
|
||||
SETPIXEL:
|
||||
jsr CALC ; Calculate coordinates
|
||||
|
||||
lda #MMU_CFG_RAM0 ; Work behind ROMs
|
||||
sei
|
||||
sta MMU_CR
|
||||
|
||||
lda (POINT),Y
|
||||
eor BITMASK
|
||||
and BITTAB,X
|
||||
eor (POINT),Y
|
||||
sta (POINT),Y
|
||||
|
||||
ldx #MMU_CFG_CC65
|
||||
stx MMU_CR
|
||||
cli
|
||||
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; GETPIXEL: Read the color value of a pixel and return it in A/X. The
|
||||
; coordinates passed to this function are never outside the visible screen
|
||||
; area, so there is no need for clipping inside this function.
|
||||
|
||||
|
||||
GETPIXEL:
|
||||
jsr CALC ; Calculate coordinates
|
||||
|
||||
lda #MMU_CFG_RAM0 ; Work behind ROMs
|
||||
sei
|
||||
sta MMU_CR
|
||||
|
||||
lda (POINT),Y
|
||||
and BITTAB,X
|
||||
beq @L1
|
||||
lda #$01 ; Foreground color
|
||||
|
||||
@L1: ldy #MMU_CFG_CC65
|
||||
sty MMU_CR
|
||||
cli
|
||||
ldx #$00 ; Clear high byte
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; LINE: Draw a line from X1/Y1 to X2/Y2, where X1/Y1 = ptr1/ptr2 and
|
||||
; X2/Y2 = ptr3/ptr4 using the current drawing color.
|
||||
;
|
||||
; X1,X2 etc. are set up above (x2=LINNUM in particular)
|
||||
; Format is LINE x2,y2,x1,y1
|
||||
;
|
||||
; Must set an error code: NO
|
||||
;
|
||||
|
||||
LINE:
|
||||
|
||||
@CHECK: lda X2 ;Make sure x1<x2
|
||||
sec
|
||||
sbc X1
|
||||
tax
|
||||
lda X2+1
|
||||
sbc X1+1
|
||||
bpl @CONT
|
||||
lda Y2 ;If not, swap P1 and P2
|
||||
ldy Y1
|
||||
sta Y1
|
||||
sty Y2
|
||||
lda Y2+1
|
||||
ldy Y1+1
|
||||
sta Y1+1
|
||||
sty Y2+1
|
||||
lda X1
|
||||
ldy X2
|
||||
sty X1
|
||||
sta X2
|
||||
lda X2+1
|
||||
ldy X1+1
|
||||
sta X1+1
|
||||
sty X2+1
|
||||
bcc @CHECK
|
||||
|
||||
@CONT: sta DX+1
|
||||
stx DX
|
||||
|
||||
ldx #$C8 ;INY
|
||||
lda Y2 ;Calculate dy
|
||||
sec
|
||||
sbc Y1
|
||||
tay
|
||||
lda Y2+1
|
||||
sbc Y1+1
|
||||
bpl @DYPOS ;Is y2>=y1?
|
||||
lda Y1 ;Otherwise dy=y1-y2
|
||||
sec
|
||||
sbc Y2
|
||||
tay
|
||||
ldx #$88 ;DEY
|
||||
|
||||
@DYPOS: sty DY ; 8-bit DY -- FIX ME?
|
||||
stx YINCDEC
|
||||
stx XINCDEC
|
||||
|
||||
jsr CALC ; Set up .X, .Y, and POINT
|
||||
lda BITCHUNK,X
|
||||
sta OLDCHUNK
|
||||
sta CHUNK
|
||||
|
||||
lda #MMU_CFG_RAM0 ; Work behind ROMs
|
||||
sei
|
||||
sta MMU_CR
|
||||
|
||||
ldx DY
|
||||
cpx DX ;Who's bigger: dy or dx?
|
||||
bcc STEPINX ;If dx, then...
|
||||
lda DX+1
|
||||
bne STEPINX
|
||||
|
||||
;
|
||||
; Big steps in Y
|
||||
;
|
||||
; To simplify my life, just use PLOT to plot points.
|
||||
;
|
||||
; No more!
|
||||
; Added special plotting routine -- cool!
|
||||
;
|
||||
; X is now counter, Y is y-coordinate
|
||||
;
|
||||
; On entry, X=DY=number of loop iterations, and Y=
|
||||
; Y1 AND #$07
|
||||
STEPINY:
|
||||
lda #00
|
||||
sta OLDCHUNK ;So plotting routine will work right
|
||||
lda CHUNK
|
||||
lsr ;Strip the bit
|
||||
eor CHUNK
|
||||
sta CHUNK
|
||||
txa
|
||||
beq YCONT2 ;If dy=0, it's just a point
|
||||
@CONT: lsr ;Init counter to dy/2
|
||||
;
|
||||
; Main loop
|
||||
;
|
||||
YLOOP: sta TEMP
|
||||
|
||||
lda (POINT),y
|
||||
eor BITMASK
|
||||
and CHUNK
|
||||
eor (POINT),y
|
||||
sta (POINT),y
|
||||
YINCDEC:
|
||||
iny ;Advance Y coordinate
|
||||
cpy #8
|
||||
bcc @CONT ;No prob if Y=0..7
|
||||
jsr FIXY
|
||||
@CONT: lda TEMP ;Restore A
|
||||
sec
|
||||
sbc DX
|
||||
bcc YFIXX
|
||||
YCONT: dex ;X is counter
|
||||
bne YLOOP
|
||||
YCONT2: lda (POINT),y ;Plot endpoint
|
||||
eor BITMASK
|
||||
and CHUNK
|
||||
eor (POINT),y
|
||||
sta (POINT),y
|
||||
ldx #MMU_CFG_CC65
|
||||
stx MMU_CR
|
||||
cli
|
||||
rts
|
||||
|
||||
YFIXX: ;x=x+1
|
||||
adc DY
|
||||
lsr CHUNK
|
||||
bne YCONT ;If we pass a column boundary...
|
||||
ror CHUNK ;then reset CHUNK to $80
|
||||
sta TEMP2
|
||||
lda POINT ;And add 8 to POINT
|
||||
adc #8
|
||||
sta POINT
|
||||
bcc @CONT
|
||||
inc POINT+1
|
||||
@CONT: lda TEMP2
|
||||
dex
|
||||
bne YLOOP
|
||||
beq YCONT2
|
||||
|
||||
;
|
||||
; Big steps in X direction
|
||||
;
|
||||
; On entry, X=DY=number of loop iterations, and Y=
|
||||
; Y1 AND #$07
|
||||
|
||||
.bss
|
||||
COUNTHI:
|
||||
.byte $00 ;Temporary counter
|
||||
;only used once
|
||||
.code
|
||||
STEPINX:
|
||||
ldx DX
|
||||
lda DX+1
|
||||
sta COUNTHI
|
||||
cmp #$80
|
||||
ror ;Need bit for initialization
|
||||
sta Y1 ;High byte of counter
|
||||
txa
|
||||
bne @CONT ;Could be $100
|
||||
dec COUNTHI
|
||||
@CONT: ror
|
||||
;
|
||||
; Main loop
|
||||
;
|
||||
XLOOP: lsr CHUNK
|
||||
beq XFIXC ;If we pass a column boundary...
|
||||
XCONT1: sbc DY
|
||||
bcc XFIXY ;Time to step in Y?
|
||||
XCONT2: dex
|
||||
bne XLOOP
|
||||
dec COUNTHI ;High bits set?
|
||||
bpl XLOOP
|
||||
|
||||
lsr CHUNK ;Advance to last point
|
||||
jsr LINEPLOT ;Plot the last chunk
|
||||
ldx #MMU_CFG_CC65
|
||||
stx MMU_CR
|
||||
cli
|
||||
rts
|
||||
;
|
||||
; CHUNK has passed a column, so plot and increment pointer
|
||||
; and fix up CHUNK, OLDCHUNK.
|
||||
;
|
||||
XFIXC: sta TEMP
|
||||
jsr LINEPLOT
|
||||
lda #$FF
|
||||
sta CHUNK
|
||||
sta OLDCHUNK
|
||||
lda POINT
|
||||
clc
|
||||
adc #8
|
||||
sta POINT
|
||||
lda TEMP
|
||||
bcc XCONT1
|
||||
inc POINT+1
|
||||
jmp XCONT1
|
||||
;
|
||||
; Check to make sure there isn't a high bit, plot chunk,
|
||||
; and update Y-coordinate.
|
||||
;
|
||||
XFIXY: dec Y1 ;Maybe high bit set
|
||||
bpl XCONT2
|
||||
adc DX
|
||||
sta TEMP
|
||||
lda DX+1
|
||||
adc #$FF ;Hi byte
|
||||
sta Y1
|
||||
|
||||
jsr LINEPLOT ;Plot chunk
|
||||
lda CHUNK
|
||||
sta OLDCHUNK
|
||||
|
||||
lda TEMP
|
||||
XINCDEC:
|
||||
iny ;Y-coord
|
||||
cpy #8 ;0..7 is ok
|
||||
bcc XCONT2
|
||||
sta TEMP
|
||||
jsr FIXY
|
||||
lda TEMP
|
||||
jmp XCONT2
|
||||
|
||||
;
|
||||
; Subroutine to plot chunks/points (to save a little
|
||||
; room, gray hair, etc.)
|
||||
;
|
||||
LINEPLOT: ; Plot the line chunk
|
||||
lda (POINT),Y
|
||||
eor BITMASK
|
||||
ora CHUNK
|
||||
and OLDCHUNK
|
||||
eor CHUNK
|
||||
eor (POINT),Y
|
||||
sta (POINT),Y
|
||||
rts
|
||||
|
||||
;
|
||||
; Subroutine to fix up pointer when Y decreases through
|
||||
; zero or increases through 7.
|
||||
;
|
||||
FIXY: cpy #255 ;Y=255 or Y=8
|
||||
beq @DECPTR
|
||||
|
||||
@INCPTR: ;Add 320 to pointer
|
||||
ldy #0 ;Y increased through 7
|
||||
lda POINT
|
||||
adc #<320
|
||||
sta POINT
|
||||
lda POINT+1
|
||||
adc #>320
|
||||
sta POINT+1
|
||||
rts
|
||||
|
||||
@DECPTR: ;Okay, subtract 320 then
|
||||
ldy #7 ;Y decreased through 0
|
||||
lda POINT
|
||||
sec
|
||||
sbc #<320
|
||||
sta POINT
|
||||
lda POINT+1
|
||||
sbc #>320
|
||||
sta POINT+1
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; 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
|
||||
;
|
||||
|
||||
; Note: This function needs optimization. It's just a cheap translation of
|
||||
; the original C wrapper and could be written much smaller (besides that,
|
||||
; calling LINE is not a good idea either).
|
||||
|
||||
BAR:
|
||||
lda X2
|
||||
sta X2SAVE
|
||||
lda X2+1
|
||||
sta X2SAVE+1
|
||||
|
||||
lda Y2
|
||||
sta Y2SAVE
|
||||
|
||||
lda X1
|
||||
sta X1SAVE
|
||||
lda X1+1
|
||||
sta X1SAVE+1
|
||||
|
||||
lda Y1
|
||||
sta Y1SAVE
|
||||
|
||||
@L1: sta Y2
|
||||
lda #>200
|
||||
sta Y1+1
|
||||
sta Y2+1
|
||||
|
||||
jsr LINE
|
||||
|
||||
lda Y1SAVE
|
||||
cmp Y2SAVE
|
||||
beq @L4
|
||||
|
||||
inc Y1SAVE
|
||||
|
||||
lda X1SAVE
|
||||
sta X1
|
||||
lda X1SAVE+1
|
||||
sta X1+1
|
||||
|
||||
lda X2SAVE
|
||||
sta X2
|
||||
lda X2SAVE+1
|
||||
sta X2+1
|
||||
|
||||
lda Y1SAVE
|
||||
sta Y1
|
||||
jmp @L1
|
||||
|
||||
@L4: 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:
|
||||
|
||||
; Calculate a pointer to the representation of the character in the
|
||||
; character ROM
|
||||
|
||||
ldx #((>(CHARROM + $0800)) >> 3)
|
||||
ldy #0
|
||||
lda (TEXT),y
|
||||
bmi @L1
|
||||
ldx #((>(CHARROM + $0000)) >> 3)
|
||||
@L1: stx ptr4+1
|
||||
asl a
|
||||
rol ptr4+1
|
||||
asl a
|
||||
rol ptr4+1
|
||||
asl a
|
||||
rol ptr4+1
|
||||
sta ptr4
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; Calculate all variables to plot the pixel at X1/Y1.
|
||||
|
||||
CALC: lda Y1
|
||||
sta TEMP2
|
||||
and #7
|
||||
tay
|
||||
lda Y1+1
|
||||
lsr ; Neg is possible
|
||||
ror TEMP2
|
||||
lsr
|
||||
ror TEMP2
|
||||
lsr
|
||||
ror TEMP2
|
||||
|
||||
lda #00
|
||||
sta POINT
|
||||
lda TEMP2
|
||||
cmp #$80
|
||||
ror
|
||||
ror POINT
|
||||
cmp #$80
|
||||
ror
|
||||
ror POINT ; row*64
|
||||
adc TEMP2 ; +row*256
|
||||
clc
|
||||
adc #>VBASE ; +bitmap base
|
||||
sta POINT+1
|
||||
|
||||
lda X1
|
||||
tax
|
||||
and #$F8
|
||||
clc
|
||||
adc POINT ; +(X AND #$F8)
|
||||
sta POINT
|
||||
lda X1+1
|
||||
adc POINT+1
|
||||
sta POINT+1
|
||||
txa
|
||||
and #7
|
||||
tax
|
||||
rts
|
||||
Loading…
Reference in New Issue
Block a user