mirror of
https://github.com/cc65/cc65.git
synced 2025-01-21 15:32:41 +00:00
Made the VIC-IIe TGI driver put its bitmap behind the ROMs.
This commit is contained in:
Greg King
parent
1981af0bbd
commit
5e67eee362
@ -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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@ -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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@ -3,15 +3,16 @@
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;
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; Based on Stephen L. Judd's GRLIB code.
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;
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; 2017-01-13, Greg King
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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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@ -77,7 +78,7 @@ 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 ; Dito
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OLDCHUNK := X2+1 ; Ditto
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; Absolute variables used in the code
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@ -88,18 +89,15 @@ PALETTE: .res 2 ; The current palette
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BITMASK: .res 1 ; $00 = clear, $FF = set pixels
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; INIT/DONE
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OLDD018: .res 1 ; Old register value
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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 2
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Y1SAVE: .res 1
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X2SAVE: .res 2
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Y2SAVE: .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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@ -116,15 +114,10 @@ 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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CBASE := $5C00 ; Color memory base address
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VBASE := $6000 ; Video memory base address
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; BASE + $4000 for each bank above VIC bank 0
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; $2000 = VIC bank 0 (base)
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; $6000 = VIC bank 1
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; $A000 = VIC bank 2
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; $E000 = VIC bank 3
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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 := $E000 ; Color memory base address
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.code
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@ -166,28 +159,38 @@ UNINSTALL:
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;
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INIT:
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; Initialize variables
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ldx #$FF
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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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; Switch into graphics mode.
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; select video bank
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; bank 0=3 ($0-$3FFF) (default)
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; bank 1=2 ($4000-$7FFF) *
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; bank 2=1 ($8000-$BFFF)
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; bank 3=0 ($C000-$FFFF)
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lda $DD00
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and #$FC
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ora #$02 ; bank number 1 ($4000)
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sta $DD00
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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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; Switch to bitmap mode
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lda $D8
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ora #$20
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sta $D8
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DONE1: lda #TGI_ERR_OK
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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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@ -199,19 +202,26 @@ DONE1: lda #TGI_ERR_OK
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; Must set an error code: NO
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;
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DONE: ; select video bank
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lda $DD00
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and #$FC
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ora #$03 ; bank 0=3 ($0-$3FFF), 1=2 ($4000-$7FFF), 2=1 ($8000-$BFFF), 3=0 ($C000-$FFFF)
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sta $DD00
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DONE:
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lda $0A2D ; change screen ram location
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AND #$0F
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ORA #$10 ; $0400
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STA $0A2D
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; Select the text video bank.
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LDA #$00 ; switch back to text mode
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STA $D8
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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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@ -240,9 +250,12 @@ CONTROL:
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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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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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@ -274,9 +287,12 @@ CLEAR:
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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+$1E40,y ; preserve vectors
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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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@ -337,26 +353,22 @@ SETPALETTE:
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asl a
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asl a
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ora PALETTE ; Background color
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tax
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; Initialize the color map with the new color settings (it is below the
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; I/O area)
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; Kernal ROM).
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ldy #$00
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ldx #MMU_CFG_RAM0
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sei
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lda $01 ; Get ROM config
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pha ; Save it
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and #%11111100 ; Clear bit 0 and 1
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sta $01
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txa ; Load color code
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stx MMU_CR
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@L2: sta CBASE+$0000,y
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sta CBASE+$0100,y
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sta CBASE+$0200,y
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sta CBASE+$02e8,y
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iny
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bne @L2
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pla
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sta $01
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ldx #MMU_CFG_CC65
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stx MMU_CR
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cli
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; Done, reset the error code
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@ -403,11 +415,9 @@ GETDEFPALETTE:
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SETPIXEL:
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jsr CALC ; Calculate coordinates
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sei ; Get underneath ROM
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lda $01
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pha
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lda #$34
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sta $01
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lda #MMU_CFG_RAM0 ; Work behind ROMs
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sei
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sta MMU_CR
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lda (POINT),Y
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eor BITMASK
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@ -415,11 +425,11 @@ SETPIXEL:
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eor (POINT),Y
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sta (POINT),Y
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pla
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sta $01
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ldx #MMU_CFG_CC65
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stx MMU_CR
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cli
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@L9: rts
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rts
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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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@ -430,23 +440,18 @@ SETPIXEL:
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GETPIXEL:
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jsr CALC ; Calculate coordinates
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sei ; Get underneath ROM
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lda $01
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pha
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lda #$34
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sta $01
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lda #MMU_CFG_RAM0 ; Work behind ROMs
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sei
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sta MMU_CR
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lda (POINT),Y
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ldy #$00
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and BITTAB,X
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beq @L1
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iny
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lda #$01 ; Foreground color
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@L1: pla
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sta $01
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@L1: ldy #MMU_CFG_CC65
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sty MMU_CR
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cli
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tya ; Get color value into A
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ldx #$00 ; Clear high byte
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rts
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@ -513,9 +518,9 @@ LINE:
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sta OLDCHUNK
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sta CHUNK
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sei ; Get underneath ROM
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lda #$34
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sta $01
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lda #MMU_CFG_RAM0 ; Work behind ROMs
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sei
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sta MMU_CR
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ldx DY
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cpx DX ;Who's bigger: dy or dx?
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@ -571,8 +576,8 @@ YCONT2: lda (POINT),y ;Plot endpoint
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and CHUNK
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eor (POINT),y
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sta (POINT),y
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lda #$36
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sta $01
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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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@ -628,8 +633,8 @@ XCONT2: dex
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lsr CHUNK ;Advance to last point
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jsr LINEPLOT ;Plot the last chunk
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lda #$36
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sta $01
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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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@ -737,47 +742,35 @@ FIXY: cpy #255 ;Y=255 or Y=8
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; the original C wrapper and could be written much smaller (besides that,
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; calling LINE is not a good idea either).
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BAR: lda Y2
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sta Y2SAVE
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lda Y2+1
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sta Y2SAVE+1
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BAR:
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lda X2
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sta X2SAVE
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lda X2+1
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sta X2SAVE+1
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lda Y1
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sta Y1SAVE
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lda Y1+1
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sta Y1SAVE+1
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lda Y2
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sta Y2SAVE
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lda X1
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sta X1SAVE
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lda X1+1
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sta X1SAVE+1
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@L1: lda Y1
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sta Y2
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lda Y1+1
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lda Y1
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sta Y1SAVE
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@L1: sta Y2
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lda #>200
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sta Y1+1
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sta Y2+1
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jsr LINE
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lda Y1SAVE
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cmp Y2SAVE
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bne @L2
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lda Y1SAVE
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cmp Y2SAVE
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beq @L4
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@L2: inc Y1SAVE
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bne @L3
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inc Y1SAVE+1
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@L3: lda Y1SAVE
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sta Y1
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lda Y1SAVE+1
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sta Y1+1
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inc Y1SAVE
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lda X1SAVE
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sta X1
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@ -788,6 +781,9 @@ BAR: lda Y2
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sta X2
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lda X2SAVE+1
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sta X2+1
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lda Y1SAVE
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sta Y1
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jmp @L1
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@L4: rts
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