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681 lines
13 KiB
ArmAsm
681 lines
13 KiB
ArmAsm
;
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; Graphics driver for the 320x200x2 and 640x200x2 modes on GEOS 64/128
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; 2010-08-17, Maciej 'YTM/Elysium' Witkowiak <ytm@elysium.pl>
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; 2010-08-18, Greg King
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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 "const.inc"
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.include "jumptab.inc"
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.include "geossym.inc"
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.include "geossym2.inc"
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.macpack generic
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; ------------------------------------------------------------------------
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; Constants
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VDC_ADDR_REG := $D600 ; VDC address
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VDC_DATA_REG := $D601 ; VDC data
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VDC_DSP_HI = 12 ; registers used
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VDC_DSP_LO = 13
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VDC_DATA_HI = 18
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VDC_DATA_LO = 19
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VDC_VSCROLL = 24
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VDC_HSCROLL = 25
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VDC_COLORS = 26
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VDC_CSET = 28
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VDC_COUNT = 30
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VDC_DATA = 31
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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 signature,
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; and defines the 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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xres: .word 320 ; X resolution
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yres: .word 200 ; Y resolution
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.byte 2 ; Number of drawing colors
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pages: .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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aspect: .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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.addr 0 ; IRQ entry is unused
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; ------------------------------------------------------------------------
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; Data.
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; Variables mapped to the zero-page segment variables. Some of these are
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; used for passing parameters to the driver.
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X1 = ptr1
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Y1 = ptr2
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X2 = ptr3
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Y2 = ptr4
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; Absolute variables used in the code
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.bss
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SCRBASE:
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.res 1 ; High byte of screen base (64k VDC only)
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ERROR:
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.res 1 ; Error code
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PALETTE:
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.res 2 ; The current palette
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BITMASK:
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.res 1 ; $00 = clear, $01 = set pixels
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OLDCOLOR:
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.res 1 ; colors before entering gfx mode
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; Text output stuff
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TEXTMAGX:
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.res 1
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TEXTMAGY:
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.res 1
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TEXTDIR:
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.res 1
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; Constants and tables
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.rodata
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DEFPALETTE:
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.byte $00, $0f ; White on black
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PALETTESIZE = * - DEFPALETTE
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; color translation table (indexed by VIC color)
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COLTRANS:
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.byte $00, $0f, $08, $06, $0a, $04, $02, $0c
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.byte $0d, $0b, $09, $01, $0e, $05, $03, $07
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; colors BROWN and GRAY3 are wrong
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.code
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; ------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. May
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; initialize anything that has to be done just once. Is probably empty
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; most of the time.
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;
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; Must set an error code: NO
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;
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INSTALL:
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lda version ; if GEOS 1.0...
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and #$f0
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cmp #$10
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beq @L40
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lda c128Flag ; at least GEOS 2.0, but we're on C128?
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bpl @L40
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lda graphMode ; GEOS 2.0, C128, but is 80 column screen enabled?
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bmi @L80
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@L40: rts ; leave default values for 40 column screen
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; check for VDC version and update register $19 value
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@L80:
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; double the x resolution and halve the aspect ratio
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asl xres
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rol xres+1
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lsr aspect+1
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ror aspect
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; update number of available screens
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ldx #VDC_CSET ; determine size of RAM...
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jsr VDCReadReg
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sta tmp1
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ora #%00010000
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jsr VDCWriteReg ; turn on 64k
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jsr settestadr1 ; save original value of test byte
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jsr VDCReadByte
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sta tmp2
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lda #$55 ; write $55 here
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ldy #ptr1
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jsr test64k ; read it here and there
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lda #$aa ; write $aa here
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ldy #ptr2
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jsr test64k ; read it here and there
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jsr settestadr1
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lda tmp2
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jsr VDCWriteByte ; restore original value of test byte
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lda ptr1 ; do bytes match?
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cmp ptr1+1
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bne @have64k
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lda ptr2
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cmp ptr2+1
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bne @have64k
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ldx #VDC_CSET
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lda tmp1
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jsr VDCWriteReg ; restore 16/64k flag
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jmp @endok ; and leave default values for 16k
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@have64k:
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lda #4
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sta pages
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@endok:
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lda #0
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sta SCRBASE ; draw page 0 as default
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rts
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test64k:
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sta tmp1
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sty ptr3
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lda #0
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sta ptr3+1
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jsr settestadr1
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lda tmp1
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jsr VDCWriteByte ; write $55
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jsr settestadr1
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jsr VDCReadByte ; read here
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pha
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jsr settestadr2
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jsr VDCReadByte ; and there
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ldy #1
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sta (ptr3),y
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pla
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dey
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sta (ptr3),y
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rts
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settestadr1:
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ldy #$02 ; test page 2 (here)
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.byte $2c
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settestadr2:
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ldy #$42 ; or page 64+2 (there)
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lda #0
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jmp VDCSetSourceAddr
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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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ldx #$01
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stx BITMASK ; solid black as pattern
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lda #1
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jsr SetPattern
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lda #ST_WR_FORE ; write only on foreground
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sta dispBufferOn
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lda graphMode
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bmi @L80
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; Remember current color value (40 columns)
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lda screencolors
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sta OLDCOLOR
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jmp @L99
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; Remember current color value (80 columns)
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@L80: lda scr80colors
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sta OLDCOLOR
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@L99: lda #0
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jsr SETVIEWPAGE ; switch into viewpage 0
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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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lda #0
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jsr SETVIEWPAGE ; switch into viewpage 0
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lda graphMode
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bmi @L80
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lda OLDCOLOR
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sta screencolors ; restore color for 40 columns
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ldx #0
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@L1: sta COLOR_MATRIX,x
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sta COLOR_MATRIX+$0100,x
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sta COLOR_MATRIX+$0200,x
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sta COLOR_MATRIX+1000-256,x
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inx
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bne @L1
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rts
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@L80: lda OLDCOLOR ; restore color for 80 columns
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ldx #VDC_COLORS
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jmp VDCWriteReg
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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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lda curPattern
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pha
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lda #0
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jsr SetPattern
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ldx #0
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stx r3L
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stx r3H
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stx r2L
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lda #199
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sta r2H
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lda graphMode
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bpl @L40
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lda #>639 ; 80 columns
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ldx #<639
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bne @L99
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@L40: lda #>319 ; 40 columns
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ldx #<319
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@L99: sta r4H
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stx r4L
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jsr Rectangle
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pla
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sta curPattern
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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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SETVIEWPAGE:
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ldx graphMode
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bmi @L80
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rts
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@L80: clc
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ror
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ror
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ror
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ldx #VDC_DSP_HI
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jmp VDCWriteReg
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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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ldx graphMode
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bmi @L80
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rts
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@L80: clc
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ror
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ror
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ror
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sta SCRBASE
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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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tax
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beq @L1
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lda #1
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@L1: sta BITMASK
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jmp SetPattern ; need to have either 0 or 1
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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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jsr GETERROR ; clear error (if any)
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ldy #PALETTESIZE - 1
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@L1: lda (ptr1),y ; Copy the palette
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and #$0F ; Make a valid color
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sta PALETTE,y
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dey
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bpl @L1
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; Put colors from palette into screen
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lda graphMode
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bmi @L80
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lda PALETTE+1 ; foreground
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asl a
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asl a
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asl a
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asl a
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ora PALETTE ; background
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ldx #0
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@L2: sta COLOR_MATRIX,x
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sta COLOR_MATRIX+$0100,x
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sta COLOR_MATRIX+$0200,x
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sta COLOR_MATRIX+1000-256,x
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inx
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bne @L2
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rts
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@L80: ldy PALETTE+1 ; Foreground color
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lda COLTRANS,y
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asl a
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asl a
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asl a
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asl a
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ldy PALETTE ; Background color
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ora COLTRANS,y
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ldx #VDC_COLORS
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jmp VDCWriteReg
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; ------------------------------------------------------------------------
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; GETPALETTE: Return the current palette in A/X. Even drivers that cannot
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; set the palette should return the default palette here, so there's no
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; way for this function to fail.
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;
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; Must set an error code: NO
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;
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GETPALETTE:
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lda #<PALETTE
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ldx #>PALETTE
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rts
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; ------------------------------------------------------------------------
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; GETDEFPALETTE: Return the default palette for the driver in A/X. All
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; drivers should return something reasonable here, even drivers that don't
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; support palettes, otherwise the caller has no way to determine the colors
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; of the (not changeable) palette.
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;
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; Must set an error code: NO (all drivers must have a default palette)
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;
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GETDEFPALETTE:
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lda #<DEFPALETTE
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ldx #>DEFPALETTE
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rts
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; ------------------------------------------------------------------------
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; SETPIXEL: Draw one pixel at X1/Y1 = ptr1/ptr2 with the current drawing
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; color. The coordinates passed to this function are never outside the
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; visible screen area, so there is no need for clipping inside this function.
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;
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; Must set an error code: NO
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;
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SETPIXEL:
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lda X1
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ldx X1+1
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ldy Y1
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sta r3L
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stx r3H
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sty r11L
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sec
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lda BITMASK ; set or clear C flag
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bne @L1
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clc
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@L1: lda #0
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jmp DrawPoint
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; ------------------------------------------------------------------------
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; GETPIXEL: Read the color value of a pixel and return it in A/X. The
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; coordinates passed to this function are never outside the visible screen
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; area, so there is no need for clipping inside this function.
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GETPIXEL:
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lda X1
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ldx X1+1
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ldy Y1
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sta r3L
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stx r3H
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sty r11L
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jsr TestPoint
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ldx #0
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bcc @L1
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inx
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@L1: txa
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ldx #0
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rts
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; ------------------------------------------------------------------------
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; LINE: Draw a line from X1/Y1 to X2/Y2, where X1/Y1 = ptr1/ptr2 and
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; X2/Y2 = ptr3/ptr4 using the current drawing color.
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;
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; Must set an error code: NO
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;
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LINE:
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lda X1
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ldx X1+1
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ldy Y1
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sta r3L
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stx r3H
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sty r11L
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lda X2
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ldx X2+1
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ldy Y2
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sta r4L
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stx r4H
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sty r11H
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sec
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lda BITMASK ; set or clear C flag
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bne @L1
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clc
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@L1: lda #0
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jmp DrawLine
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; ------------------------------------------------------------------------
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; BAR: Draw a filled rectangle with the corners X1/Y1, X2/Y2, where
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; X1/Y1 = ptr1/ptr2 and X2/Y2 = ptr3/ptr4 using the current drawing color.
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; Contrary to most other functions, the graphics kernel will sort and clip
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; the coordinates before calling the driver, so on entry the following
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; conditions are valid:
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; X1 <= X2
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; Y1 <= Y2
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; (X1 >= 0) && (X1 < XRES)
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; (X2 >= 0) && (X2 < XRES)
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; (Y1 >= 0) && (Y1 < YRES)
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; (Y2 >= 0) && (Y2 < YRES)
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;
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; Must set an error code: NO
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;
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BAR:
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lda X1
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ldx X1+1
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ldy Y1
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sta r3L
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stx r3H
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sty r2L
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lda X2
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ldx X2+1
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ldy Y2
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sta r4L
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stx r4H
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sty r2H
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jmp Rectangle
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; ------------------------------------------------------------------------
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; TEXTSTYLE: Set the style used when calling OUTTEXT. Text scaling in X and Y
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; direction is passend in X/Y, the text direction is passed in A.
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;
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; Must set an error code: NO
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;
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|
|
TEXTSTYLE:
|
|
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 TEXTDIR
|
|
; cmp #TGI_TEXT_HORIZONTAL ; this is equal 0
|
|
bne @vertical
|
|
|
|
lda X1 ; horizontal text output
|
|
ldx X1+1
|
|
ldy Y1
|
|
sta r11L
|
|
stx r11H
|
|
sty r1H
|
|
lda ptr3
|
|
ldx ptr3+1
|
|
sta r0L
|
|
stx r0H
|
|
jmp PutString
|
|
|
|
@vertical:
|
|
lda X1 ; vertical text output
|
|
ldx X1+1
|
|
ldy Y1
|
|
sta r11L
|
|
stx r11H
|
|
sty r1H
|
|
ldy #0
|
|
lda (ptr3),y
|
|
beq @end
|
|
jsr PutChar
|
|
inc ptr3
|
|
bne @L1
|
|
inc ptr3+1
|
|
@L1: lda Y1
|
|
clc
|
|
adc #8
|
|
sta Y1
|
|
bne @vertical
|
|
@end: rts
|
|
|
|
;-------------
|
|
; VDC helpers
|
|
|
|
VDCSetSourceAddr:
|
|
pha
|
|
tya
|
|
ldx #VDC_DATA_HI
|
|
jsr VDCWriteReg
|
|
pla
|
|
ldx #VDC_DATA_LO
|
|
bne VDCWriteReg
|
|
|
|
VDCReadByte:
|
|
ldx #VDC_DATA
|
|
VDCReadReg:
|
|
stx VDC_ADDR_REG
|
|
@L0: bit VDC_ADDR_REG
|
|
bpl @L0
|
|
lda VDC_DATA_REG
|
|
rts
|
|
|
|
VDCWriteByte:
|
|
ldx #VDC_DATA
|
|
VDCWriteReg:
|
|
stx VDC_ADDR_REG
|
|
@L0: bit VDC_ADDR_REG
|
|
bpl @L0
|
|
sta VDC_DATA_REG
|
|
rts
|