; 2012-08-11, Greg King <greg.king5@verizon.net>
;
- .include "zeropage.inc"
+ .include "zeropage.inc"
- .include "tgi-kernel.inc"
- .include "tgi-error.inc"
- .include "atmos.inc"
+ .include "tgi-kernel.inc"
+ .include "tgi-error.inc"
+ .include "atmos.inc"
- .macpack generic
+ .macpack generic
-XSIZE = 6 ; System font width
-YSIZE = 8 ; System font height
+XSIZE = 6 ; System font width
+YSIZE = 8 ; System font height
; ------------------------------------------------------------------------
; Header. Includes jump table and constants.
-.segment "JUMPTABLE"
+.segment "JUMPTABLE"
; The first part of the header is a structure that has a signature,
; and defines the capabilities of the driver.
- .byte "tgi"
- .byte TGI_API_VERSION ; TGI API version number
- .word 228 ; x resolution
- .word 200 ; y resolution
- .byte 3 ; Number of drawing colors
- .byte 1 ; Number of screens available
- .byte XSIZE ; System font x size
- .byte YSIZE ; System font y size
- .word $011C ; Aspect ratio (based on 4/3 display)
- .byte 0 ; TGI driver flags
+ .byte "tgi"
+ .byte TGI_API_VERSION ; TGI API version number
+ .word 228 ; x resolution
+ .word 200 ; y resolution
+ .byte 3 ; Number of drawing colors
+ .byte 1 ; Number of screens available
+ .byte XSIZE ; System font x size
+ .byte YSIZE ; System font y size
+ .word $011C ; Aspect ratio (based on 4/3 display)
+ .byte 0 ; TGI driver flags
; Next comes the jump table. Currently, all entries must be valid;
; and, may point to an RTS, for test versions (function not implemented).
- .addr INSTALL
- .addr UNINSTALL
- .addr INIT
- .addr DONE
- .addr GETERROR
- .addr CONTROL
- .addr CLEAR
- .addr SETVIEWPAGE
- .addr SETDRAWPAGE
- .addr SETCOLOR
- .addr SETPALETTE
- .addr GETPALETTE
- .addr GETDEFPALETTE
- .addr SETPIXEL
- .addr GETPIXEL
- .addr LINE
- .addr BAR
- .addr TEXTSTYLE
- .addr OUTTEXT
- .addr 0 ; IRQ entry is unused
+ .addr INSTALL
+ .addr UNINSTALL
+ .addr INIT
+ .addr DONE
+ .addr GETERROR
+ .addr CONTROL
+ .addr CLEAR
+ .addr SETVIEWPAGE
+ .addr SETDRAWPAGE
+ .addr SETCOLOR
+ .addr SETPALETTE
+ .addr GETPALETTE
+ .addr GETDEFPALETTE
+ .addr SETPIXEL
+ .addr GETPIXEL
+ .addr LINE
+ .addr BAR
+ .addr TEXTSTYLE
+ .addr OUTTEXT
+ .addr 0 ; IRQ entry is unused
; ------------------------------------------------------------------------
; Data.
; Variables mapped to the zero-page segment variables. These are
; used for passing parameters to the driver.
-X1 := ptr1
-Y1 := ptr2
-X2 := ptr3
-Y2 := ptr4
+X1 := ptr1
+Y1 := ptr2
+X2 := ptr3
+Y2 := ptr4
; Absolute variables used in the code
.bss
-ERROR: .res 1 ; Error code
-MODE: .res 1 ; Graphics mode
-PALETTE: .res 2
+ERROR: .res 1 ; Error code
+MODE: .res 1 ; Graphics mode
+PALETTE: .res 2
; Constants and table
; BASIC 1.1 addresses
-PATTERN := $213
-PARAM1 := $2E1 ; & $2E2
-PARAM2 := $2E3 ; & $2E4
-PARAM3 := $2E5 ; & $2E6
-TEXT := $EC21
-HIRES := $EC33
-CURSET := $F0C8
-CURMOV := $F0FD
-DRAW := $F110
-CHAR := $F12D
-POINT := $F1C8
-PAPER := $F204
-INK := $F210
+PATTERN := $213
+PARAM1 := $2E1 ; & $2E2
+PARAM2 := $2E3 ; & $2E4
+PARAM3 := $2E5 ; & $2E6
+TEXT := $EC21
+HIRES := $EC33
+CURSET := $F0C8
+CURMOV := $F0FD
+DRAW := $F110
+CHAR := $F12D
+POINT := $F1C8
+PAPER := $F204
+INK := $F210
.rodata
; (The third "color" actually flips a pixel
; between the foreground and background colors.)
;
-DEFPALETTE: .byte 0, 1
+DEFPALETTE: .byte 0, 1
.code
; Switch into graphics mode.
- jsr HIRES
+ jsr HIRES
; Done, reset the error code.
; GETERROR: Return the error code in A, and clear it.
GETERROR:
- ldx #TGI_ERR_OK
- lda ERROR
- stx ERROR
+ ldx #TGI_ERR_OK
+ lda ERROR
+ stx ERROR
; ------------------------------------------------------------------------
; INSTALL routine. Is called after the driver is loaded into memory. May
;
UNINSTALL:
- rts
+ rts
; ------------------------------------------------------------------------
; DONE: Will be called to switch the graphics device back into text mode.
; Must set an error code: NO
;
-DONE := TEXT
+DONE := TEXT
; ------------------------------------------------------------------------
; CONTROL: Platform-/driver-specific entry point.
;
CONTROL:
- sta PATTERN
- lda #TGI_ERR_OK
- sta ERROR
- rts
+ sta PATTERN
+ lda #TGI_ERR_OK
+ sta ERROR
+ rts
; ------------------------------------------------------------------------
; CLEAR: Clears the screen.
; Must set an error code: NO
;
-CLEAR := HIRES
+CLEAR := HIRES
; ------------------------------------------------------------------------
; SETVIEWPAGE: Set the visible page. Called with the new page in A (0..n).
;
SETDRAWPAGE:
- rts
+ rts
; ------------------------------------------------------------------------
; SETCOLOR: Set the drawing color (in A). The new color already is checked
;
SETCOLOR:
- sta MODE
- rts
+ sta MODE
+ rts
; ------------------------------------------------------------------------
; SETPALETTE: Set the palette (not available with all drivers/hardware).
;
SETPALETTE:
- ldy #0
- jsr flipcolor
- sty PARAM1+1
- jsr PAPER
- ldy #1
- jsr flipcolor
- dey ; TGI_ERR_OK
- sty ERROR
- sty PARAM1+1
- jmp INK
+ ldy #0
+ jsr flipcolor
+ sty PARAM1+1
+ jsr PAPER
+ ldy #1
+ jsr flipcolor
+ dey ; TGI_ERR_OK
+ sty ERROR
+ sty PARAM1+1
+ jmp INK
flipcolor:
- lda (ptr1),y
- sta PALETTE,y
- cmp #1
- beq @flip
- cmp #7
- bne @keep
-@flip: eor #1 ^ 7
-@keep: sta PARAM1
- rts
+ lda (ptr1),y
+ sta PALETTE,y
+ cmp #1
+ beq @flip
+ cmp #7
+ bne @keep
+@flip: eor #1 ^ 7
+@keep: sta PARAM1
+ rts
; ------------------------------------------------------------------------
; GETPALETTE: Return the current palette in A/X. Even drivers that cannot
;
GETPALETTE:
- lda #<PALETTE
- ldx #>PALETTE
- rts
+ ldx #>PALETTE
+ rts
; ------------------------------------------------------------------------
; GETDEFPALETTE: Return the default palette for the driver in A/X. All
;
GETDEFPALETTE:
- lda #<DEFPALETTE
- ldx #>DEFPALETTE
- rts
+ lda #<DEFPALETTE
+ ldx #>DEFPALETTE
+ rts
; ------------------------------------------------------------------------
; SETPIXEL: Draw one pixel at X1/Y1 = ptr1/ptr2 with the current drawing
;
SETPIXEL:
- lda Y1
- sta PARAM2
- lda MODE
-mymode: sta PARAM3
- lda X1
- add #2 * XSIZE ; Skip screen attribute columns
- sta PARAM1
- lda #0
- sta PARAM1+1
- sta PARAM2+1
- sta PARAM3+1
- jmp CURSET
+ lda Y1
+ sta PARAM2
+ lda MODE
+mymode: sta PARAM3
+ lda X1
+ add #2 * XSIZE ; Skip screen attribute columns
+ sta PARAM1
+ lda #0
+ sta PARAM1+1
+ sta PARAM2+1
+ sta PARAM3+1
+ jmp CURSET
; ------------------------------------------------------------------------
; GETPIXEL: Read the color value of a pixel, and return it in A/X. The
; area, so there is no need for clipping inside this function.
GETPIXEL:
- lda X1
- sta PARAM1
- lda Y1
- sta PARAM2
- lda #0
- sta PARAM1+1
- sta PARAM2+1
- jsr POINT
- lda PARAM1
- and #%00000001
- ldx #0
- rts
+ lda X1
+ sta PARAM1
+ lda Y1
+ sta PARAM2
+ lda #0
+ sta PARAM1+1
+ sta PARAM2+1
+ jsr POINT
+ lda PARAM1
+ and #%00000001
+ ldx #0
+ rts
; ------------------------------------------------------------------------
; LINE: Draw a line from X1/Y1 to X2/Y2, where X1/Y1 = ptr1/ptr2 and
;
LINE:
- jsr SETPIXEL
- lda X2
- sub X1
- sta PARAM1
- lda X2+1
- sbc X1+1
- sta PARAM1+1
- lda Y2
- sub Y1
- sta PARAM2
- lda Y2+1
- sbc Y1+1
- sta PARAM2+1
- lda MODE
- sta PARAM3
- ldx #>0
- stx PARAM3+1
- jmp DRAW
+ jsr SETPIXEL
+ lda X2
+ sub X1
+ sta PARAM1
+ lda X2+1
+ sbc X1+1
+ sta PARAM1+1
+ lda Y2
+ sub Y1
+ sta PARAM2
+ lda Y2+1
+ sbc Y1+1
+ sta PARAM2+1
+ lda MODE
+ sta PARAM3
+ ldx #>0
+ stx PARAM3+1
+ jmp DRAW
; ------------------------------------------------------------------------
; BAR: Draw a filled rectangle with the corners X1/Y1, X2/Y2, where
; Contrary to most other functions, the graphics kernel will sort and clip
; the co-ordinates 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)
+; 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
;
BAR:
- inc Y2
-@L1: lda Y2
- pha
- lda Y1
- sta Y2
- jsr LINE
- pla
- sta Y2
- inc Y1
- cmp Y1
- bne @L1
- rts
+ inc Y2
+@L1: lda Y2
+ pha
+ lda Y1
+ sta Y2
+ jsr LINE
+ pla
+ sta Y2
+ inc Y1
+ cmp Y1
+ bne @L1
+ rts
; ------------------------------------------------------------------------
; TEXTSTYLE: Set the style used when calling OUTTEXT. Text scaling in the x
;
TEXTSTYLE:
- rts
+ rts
; ------------------------------------------------------------------------
;
OUTTEXT:
- lda Y1
- sub #(YSIZE - 1)
- sta PARAM2
- lda #3 ; (Move graphics cursor; don't draw)
- jsr mymode
-
- ldy #0
-@next: lda (ptr3),y
- beq @end
- sta PARAM1
- lda #0
- sta PARAM2
- sta PARAM1+1
- sta PARAM2+1
- sta PARAM3+1
- lda MODE
- sta PARAM3
- tya
- pha
- jsr CHAR
- lda #XSIZE
- sta PARAM1
- lda #0
- sta PARAM2
- sta PARAM1+1
- sta PARAM2+1
- sta PARAM3+1
- lda #3
- sta PARAM3
- jsr CURMOV
- pla
- tay
- iny
- bne @next
-@end: rts
+ lda Y1
+ sub #(YSIZE - 1)
+ sta PARAM2
+ lda #3 ; (Move graphics cursor; don't draw)
+ jsr mymode
+
+ ldy #0
+@next: lda (ptr3),y
+ beq @end
+ sta PARAM1
+ lda #0
+ sta PARAM2
+ sta PARAM1+1
+ sta PARAM2+1
+ sta PARAM3+1
+ lda MODE
+ sta PARAM3
+ tya
+ pha
+ jsr CHAR
+ lda #XSIZE
+ sta PARAM1
+ lda #0
+ sta PARAM2
+ sta PARAM1+1
+ sta PARAM2+1
+ sta PARAM3+1
+ lda #3
+ sta PARAM3
+ jsr CURMOV
+ pla
+ tay
+ iny
+ bne @next
+@end: rts
projects / cc65 / blobdiff