; ; Graphics driver for the 228x200x3 palette mode on the Telestrat ; ; Jede (jede@oric.org), 2017-10-15 .include "zeropage.inc" .include "tgi-kernel.inc" .include "tgi-error.inc" .include "telestrat.inc" .macpack generic .macpack module XSIZE = 6 ; System font width YSIZE = 8 ; System font height ; ------------------------------------------------------------------------ ; Header. Includes jump table and constants. module_header _telestrat_228_200_3_tgi ; 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 .addr $0000 ; Library reference .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 CIRCLE .addr TEXTSTYLE .addr OUTTEXT ; ------------------------------------------------------------------------ ; 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 ; Absolute variables used in the code .bss ERROR: .res 1 ; Error code MODE: .res 1 ; Graphics mode PALETTE: .res 2 ; Constant table .rodata ; Default colors: black background, white foreground ; (The third "color" actually flips a pixel ; between the foreground and background colors.) ; DEFPALETTE: .byte 0, 1 .code ; ------------------------------------------------------------------------ ; INIT: Changes an already installed device from text mode to graphics mode. ; Note that INIT/DONE may be called multiple times while the driver ; is loaded, while INSTALL is called only once. So, any code that is needed ; to initialize variables and so on must go here. Setting palette and ; clearing the screen are not needed because they are called by the graphics ; kernel later. ; The graphics kernel never will call INIT when a graphics mode is already ; active, so there is no need to protect against that. ; ; Must set an error code: YES ; INIT: ; Switch into graphics mode. BRK_TELEMON(XHIRES) ; Done, reset the error code. lda #TGI_ERR_OK sta ERROR rts ; ------------------------------------------------------------------------ ; GETERROR: Return the error code in A, and clear it. GETERROR: ldx #TGI_ERR_OK lda ERROR stx ERROR rts ; ------------------------------------------------------------------------ ; INSTALL routine. Is called after the driver is loaded into memory. May ; initialize anything that has to be done just once. Is probably empty ; most of the time. ; ; Must set an error code: NO ; INSTALL: ; ------------------------------------------------------------------------ ; UNINSTALL routine. Is called before the driver is removed from memory. May ; clean up anything done by INSTALL, but probably is empty most of the time. ; ; Must set an error code: NO ; UNINSTALL: rts ; ------------------------------------------------------------------------ ; DONE: Will be called to switch the graphics device back into text mode. ; The graphics kernel never will call DONE when no graphics mode is active, ; so there is no need to protect against that. ; ; Must set an error code: NO ; DONE: BRK_TELEMON(XTEXT) rts ; ------------------------------------------------------------------------ ; CONTROL: Platform-/driver-specific entry point. ; ; Must set an error code: YES ; CONTROL: ; not done yet rts ; ------------------------------------------------------------------------ ; CLEAR: Clears the screen. ; ; Must set an error code: NO ; CLEAR: BRK_TELEMON(XEFFHI) rts ; ------------------------------------------------------------------------ ; SETVIEWPAGE: Set the visible page. Called with the new page in A (0..n). ; The page number already is checked to be valid, by the graphics kernel. ; ; Must set an error code: NO (will be called only if page OK) ; SETVIEWPAGE: ; ------------------------------------------------------------------------ ; SETDRAWPAGE: Set the drawable page. Called with the new page in A (0..n). ; The page number already is checked to be valid, by the graphics kernel. ; ; Must set an error code: NO (will be called only if page OK) ; SETDRAWPAGE: rts ; ------------------------------------------------------------------------ ; SETCOLOR: Set the drawing color (in A). The new color already is checked ; to be in a valid range (0..maxcolor-1). ; ; Must set an error code: NO (will be called only if color OK) ; SETCOLOR: ; not done yet 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: ; not done yet rts flipcolor: ; not done yet 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: ; not done yet 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 rts ; ------------------------------------------------------------------------ ; SETPIXEL: Draw one pixel at X1/Y1 = ptr1/ptr2 with the current drawing ; color. The co-ordinates 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: lda #$80 SETPIXELSETMODE: sta HRSFB lda X1 sta HRS1 lda Y1 sta HRS2 BRK_TELEMON(XCURSE) rts ; ------------------------------------------------------------------------ ; GETPIXEL: Read the color value of a pixel, and return it in A/X. The ; co-ordinates passed to this function are never outside the visible screen ; area, so there is no need for clipping inside this function. GETPIXEL: ; not done yet rts ; ------------------------------------------------------------------------ ; LINE: Draw a line from X1/Y1 to X2/Y2, where X1/Y1 = ptr1/ptr2 and ; X2/Y2 = ptr3/ptr4, using the current drawing color. ; ; Must set an error code: NO ; LINE: ; not done yet lda X1 sta HRS1 lda Y1 sta HRS2 lda X2 sta HRS3 lda Y2 sta HRS4 lda X1+1 sta HRS1+1 lda Y1+1 sta HRS2+1 lda X2+1 sta HRS3+1 lda Y2+1 sta HRS4+1 lda #$FF sta HRSPAT BRK_TELEMON(XDRAWA) rts CIRCLE: ; not done yet 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 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) ; ; Must set an error code: NO ; BAR: ; not done yet rts ; ------------------------------------------------------------------------ ; TEXTSTYLE: Set the style used when calling OUTTEXT. Text scaling in the x ; and y directions is passed in X/Y, the text direction is passed in A. ; ; Must set an error code: NO ; TEXTSTYLE: 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 its address in ptr3. ; ; Must set an error code: NO ; OUTTEXT: ; put hires cursor in X & Y lda #$00 jsr SETPIXELSETMODE ; count the length of the string ldy #$00 loop: lda (ptr3),y beq out iny bne loop out: ; XSCHAR routine from telemon needs to have the length of the string in X register ; copy Y register to X register. It could be optimized in 65C02 with TYX tya tax lda ptr3 ; XSCHAR needs in A and Y the address of the string ldy ptr3+1 BRK_TELEMON(XSCHAR) rts