mirror of
https://github.com/cc65/cc65.git
synced 2024-12-27 00:29:31 +00:00
dacee3b9ed
All but one TGI drivers didn't use IRQs. Especially when the TGI driver kernel was the only .interruptor this meant quite some unnecessary overhead because it pulled in the whole IRQ infrastructure. The one driver using IRQs (the graphics driver for the 160x102x16 mode on the Lynx) now uses a library reference to set up a JMP to its IRQ handler.
1518 lines
32 KiB
PHP
1518 lines
32 KiB
PHP
;
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; Generic Atari graphics driver
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;
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.macpack longbranch
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.macpack module
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.ifdef __ATARIXL__
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CIO_vec := my_CIOV
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.else
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CIO_vec := CIOV
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.endif
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; ******************************************************************************
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; ----------------------------------------------------------------------
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;
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; Header. Includes jump table and constants.
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;
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; ----------------------------------------------------------------------
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.ifdef __ATARIXL__
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.define LABEL_X "x"
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.else
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.define LABEL_X ""
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.endif
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.if pages = 2
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.define LABEL_P2 "p2"
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.else
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.define LABEL_P2 ""
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.endif
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module_header .ident (.sprintf ("_atr%s%d%s_tgi", LABEL_X, ::grmode, LABEL_P2))
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; Header
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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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libref: .addr $0000 ; Library reference
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.word x_res ; X resolution
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.word y_res ; Y resolution
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.byte colors ; Number of drawing colors
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.byte pages ; 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 aspect ; Aspect ratio
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.byte 0 ; TGI driver flags
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; Function table
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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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; ----------------------------------------------------------------------
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;
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; Parameters
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;
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; ----------------------------------------------------------------------
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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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radius := tmp1
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; ******************************************************************************
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; ----------------------------------------------------------------------
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;
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; Global variables
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;
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; ----------------------------------------------------------------------
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sptr := regsave + 2
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.bss
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error:
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.res 1 ; Error code
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.if ::grmode = 9 || ::grmode = 11
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palette = default_palette
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.else
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palette:
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.res colors ; The current palette
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.endif
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mask:
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.res 1 ; Current pixel mask
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griocb:
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.res 1 ; IOCB channel number for graphics
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.if pages = 2
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p0scr:
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.res 1 ; High byte of screen address for screen page 0
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p0dls:
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.res 1 ; High byte of display list address for screen page 0
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; Page 1's addresses are 8K higher
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.endif
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.data
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mag_x:
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.byte 1 ; Horizontal text scaling factor
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mag_y:
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.byte 1 ; Vertical text scaling factor
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mag_x8:
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.word 8 ; Horizontal text scaling factor * 8
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mag_y8:
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.word 8 ; Vertical text scaling factor * 8
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text_dir:
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.byte 0 ; Text direction,
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.ifdef __ATARIXL__
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my_CIOV:
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.byte $4C, 0, 0
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.endif
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.code
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; ******************************************************************************
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.macro put_pixel
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; ----------------------------------------------------------------------
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;
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; Put a pixel at (sptr),y using x as the bit mask offset
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;
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; ----------------------------------------------------------------------
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lda (sptr),y
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eor mask
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and mask_table,x
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eor (sptr),y
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sta (sptr),y
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.endmacro
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; ******************************************************************************
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.rodata
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screen_device:
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.byte "S:",$9B ; Device code for screen
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screen_device_length := * - screen_device
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.code
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.proc INIT
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; ----------------------------------------------------------------------
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;
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; INIT: Switch to graphics mode
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;
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; ----------------------------------------------------------------------
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.code
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; Initialize drawing color
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.if ::ppb = 8
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ldx #$FF
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.elseif ::ppb = 4
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ldx #$55
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.elseif ::ppb = 2
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ldx #$11
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.endif
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stx mask
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.ifdef __ATARIXL__
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; setup pointer to CIO
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lda libref
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sta my_CIOV+1
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lda libref+1
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sta my_CIOV+2
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.endif
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; Find a free IOCB
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lda #$70
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search: tax
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ldy ICHID,x
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cpy #$FF
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beq found
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sub #$10
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bcs search
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; Not enough resources available (free IOCB or memory)
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; enter with C cleared!
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nores: lda #TGI_ERR_NO_RES
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bcc exit
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found: ; Check if enough RAM is available
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lda #0
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sub #<mem_needed
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tay
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lda RAMTOP
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sbc #>mem_needed
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cmp APPMHI + 1
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bcc nores
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bne switch
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cpy APPMHI
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bcc nores ; not enough memory
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; Switch into graphics mode
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switch: lda #OPEN
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sta ICCOM,x
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lda #OPNIN | OPNOT
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sta ICAX1,x
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lda #::grmode
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sta ICAX2,x
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lda #<screen_device
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sta ICBAL,x
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lda #>screen_device
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sta ICBAH,x
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lda #<screen_device_length
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sta ICBLL,x
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lda #>screen_device_length
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sta ICBLH,x
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jsr CIO_vec
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.if ::pages = 2
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; Reserve 8K of high memory
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lda RAMTOP
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sub #32
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sta RAMTOP
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; Close and reopen graphics
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lda #CLOSE
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sta ICCOM,x
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jsr CIO_vec
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; Reopen graphics
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lda #OPEN
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sta ICCOM,x
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lda #OPNIN | OPNOT
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sta ICAX1,x
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lda #::grmode
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sta ICAX2,x
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lda #<screen_device
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sta ICBAL,x
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lda #>screen_device
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sta ICBAH,x
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lda #<screen_device_length
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sta ICBLL,x
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lda #>screen_device_length
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sta ICBLH,x
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jsr CIO_vec
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; Save screen pointers
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lda SAVMSC + 1
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sta p0scr
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lda SDLSTH
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sta p0dls
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.endif ; ::pages = 2
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stx griocb
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; Reset the error code and return
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lda #TGI_ERR_OK
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exit: sta error
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rts
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.endproc
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; ******************************************************************************
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.proc DONE
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; ----------------------------------------------------------------------
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;
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; DONE: Switch back to text mode
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;
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; ----------------------------------------------------------------------
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.code
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.if ::pages = 2
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; Free 8K of high memory
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lda RAMTOP
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add #32
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sta RAMTOP
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.endif
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; Clear griocb
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lda #$FF
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ldx griocb
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sta griocb
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; Close the S: device
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lda #CLOSE
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sta ICCOM,x
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jsr CIO_vec
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; Reopen it in Graphics 0
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lda #OPEN
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sta ICCOM,x
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lda #OPNIN | OPNOT
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sta ICAX1,x
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lda #0
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sta ICAX2,x
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lda #<screen_device
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sta ICBAL,x
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lda #>screen_device
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sta ICBAH,x
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lda #<screen_device_length
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sta ICBLL,x
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lda #>screen_device_length
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sta ICBLH,x
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jsr CIO_vec
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; Now close it again; we don't need it anymore :)
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lda #CLOSE
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sta ICCOM,x
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jmp CIO_vec
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.endproc
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; ******************************************************************************
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.proc GETERROR
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; ----------------------------------------------------------------------
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;
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; GETERROR: Return the error code in A and clear it
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;
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; ----------------------------------------------------------------------
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.code
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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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.endproc
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; ******************************************************************************
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.proc CLEAR
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; ----------------------------------------------------------------------
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;
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; CLEAR: Clear the screen
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;
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; ----------------------------------------------------------------------
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.code
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; Load the screen address in sptr
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lda SAVMSC
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sta sptr
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lda SAVMSC + 1
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sta sptr + 1
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; Fill with zero
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lda #0
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tay
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.if >::scrsize > 0
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; Clear full pages if any
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ldx #>::scrsize
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loop1: sta (sptr),y
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iny
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bne loop1
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inc sptr + 1
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dex
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bne loop1
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.endif
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.if <::scrsize > 0
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; Clear the rest, if any
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loop2: sta (sptr),y
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iny
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cpy #<::scrsize
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bne loop2
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.endif
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rts
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.endproc
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; ******************************************************************************
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.proc GETPALETTE
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; ----------------------------------------------------------------------
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;
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; GETPALETTE: Return the current palette in A/X
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;
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; ----------------------------------------------------------------------
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.code
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lda #<palette
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ldx #>palette
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rts
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.endproc
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; ******************************************************************************
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.proc GETDEFPALETTE
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; ----------------------------------------------------------------------
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;
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; GETDEFPALETTE: Return the default palette in A/X
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;
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; ----------------------------------------------------------------------
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.code
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lda #<default_palette
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ldx #>default_palette
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rts
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.endproc
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; ******************************************************************************
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.proc SETCOLOR
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; ----------------------------------------------------------------------
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;
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; SETCOLOR: Set the drawing color (in A)
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;
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; ----------------------------------------------------------------------
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.code
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tax
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.if ::grmode = 9
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; Map colors like this: 0 -> 0, 1 -> 15, 2 -> 1, 3 -> 2 etc.
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beq cont
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cpx #1
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bne map
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ldx #16
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map: dex
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cont:
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.endif
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lda masks,x
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sta mask
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rts
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.endproc
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; ******************************************************************************
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.proc CALC
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; ----------------------------------------------------------------------
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;
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; CALC: Calculate the screen address
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; in
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; x1 (ptr1) x coordinate
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; y1 (ptr2) y coordinate
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; out
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; sptr + y screen address
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; x bit mask index
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;
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; ----------------------------------------------------------------------
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.bss
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temp: .res 1
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.code
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; calculate line offset
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lda y1 + 1
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sta temp
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lda y1
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.if ::x_res / ::ppb = 40
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yrep = 3
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.elseif ::x_res / ::ppb = 20
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yrep = 2
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.elseif ::x_res / ::ppb = 10
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yrep = 1
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.endif
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.repeat yrep
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asl a
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rol temp
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.endrepeat
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sta sptr
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ldx temp
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stx sptr + 1
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.repeat 2
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asl a
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rol temp
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.endrepeat
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add sptr
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sta sptr
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lda temp
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adc sptr + 1
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sta sptr + 1
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; calculate bit mask offset
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lda x1
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and #ppb - 1
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tax
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; calculate row offset
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lda x1 + 1
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sta temp
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lda x1
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.if ::ppb = 8
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xrep = 3
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.elseif ::ppb = 4
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xrep = 2
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.elseif ::ppb = 2
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xrep = 1
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.endif
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.repeat xrep
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lsr temp
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ror a
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.endrepeat
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tay
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; sptr += SAVMSC
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lda SAVMSC
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add sptr
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sta sptr
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lda SAVMSC + 1
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adc sptr + 1
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sta sptr + 1
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; We're done!
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rts
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.endproc
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; ******************************************************************************
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.proc SETPIXEL
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; ----------------------------------------------------------------------
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;
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; Draw one pixel at x1, y1
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;
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; ----------------------------------------------------------------------
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.code
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jsr CALC
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put_pixel
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rts
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.endproc
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; ******************************************************************************
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.proc GETPIXEL
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; ----------------------------------------------------------------------
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;
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; GETPIXEL: Read the color value of a pixel and return it in A/X
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;
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; ----------------------------------------------------------------------
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.code
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jsr CALC
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lda (sptr),y
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and mask_table,x
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.if ::ppb = 8
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beq zero
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lda #1
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zero: ldx #0
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rts
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.elseif ::ppb = 4
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loop: cpx #3
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beq done4
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lsr a
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lsr a
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inx
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bne loop
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done4: and #$03
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ldx #0
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rts
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.elseif ::ppb = 2
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dex
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bne shift
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and #$0F
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jmp exit
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shift: lsr a
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lsr a
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lsr a
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lsr a
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exit:
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.if ::grmode = 9
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; Mode 9 mapping
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; Map colors like this: 0 -> 0, 15 -> 1, 2 -> 3, 3 -> 4 etc.
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beq done9
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cmp #15
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bne map9
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lda #0
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map9: add #1
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done9:
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.endif
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|
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.if ::grmode = 10
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; Mode 10 mapping
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; Map out of range colors like this:
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; 9 -> 8
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; 10 -> 8
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; 11 -> 8
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; 12 -> 0
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; 13 -> 1
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; 14 -> 2
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; 15 -> 3
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cmp #9
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bcc done10
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sub #12
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bcs done10
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lda #8
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done10:
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.endif ; ::grmode = 10
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; Done!
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ldx #0
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rts
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.endif ; ::ppb = 2
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|
|
.endproc
|
|
|
|
; ******************************************************************************
|
|
|
|
.proc LINE
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|
|
|
; ----------------------------------------------------------------------
|
|
;
|
|
; LINE: Draw a line from x1,y1 to x2,y2
|
|
;
|
|
; ----------------------------------------------------------------------
|
|
|
|
.ifdef USE_CIO_LINE
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|
|
|
; position ptr1, ptr2
|
|
lda x1
|
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sta OLDCOL
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lda x1 + 1
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sta OLDCOL + 1
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lda y1
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sta OLDROW
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; plot
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jsr SETPIXEL
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; position ptr3,ptr4
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lda x2
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sta COLCRS
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lda x2 + 1
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sta COLCRS + 1
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lda y2
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sta ROWCRS
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|
; drawto
|
|
ldx griocb
|
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lda #DRAWLN
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|
sta ICCOM,x
|
|
lda mask
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|
|
.if ::grmode = 10
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and #$0f
|
|
.else
|
|
and #colors - 1
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|
.endif
|
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|
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sta ATACHR
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jmp CIO_vec
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|
|
|
.else ; USE_CIO_LINE
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|
|
; locals
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|
|
dx := sreg
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|
dy := y1
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|
dx2 := x2
|
|
dy2 := y2
|
|
iy := tmp1
|
|
err := tmp3
|
|
|
|
.code
|
|
; dx = x2 - x1
|
|
lda x2
|
|
sub x1
|
|
sta dx
|
|
lda x2 + 1
|
|
sbc x1 + 1
|
|
sta dx + 1
|
|
; if dx is positive, no problem
|
|
bcs dx_positive
|
|
|
|
; if dx is negative, swap x1,y1 with x2,y2
|
|
lda x1 ; x1 <-> x2, low byte
|
|
ldx x2
|
|
sta x2
|
|
stx x1
|
|
lda x1 + 1 ; x1 <-> x2, high byte
|
|
ldx x2 + 1
|
|
sta x2 + 1
|
|
stx x1 + 1
|
|
lda y1 ; y1 <-> y2, low byte
|
|
ldx y2
|
|
sta y2
|
|
stx y1
|
|
lda y1 + 1 ; y1 <-> y2, high byte
|
|
ldx y2 + 1
|
|
sta y2 + 1
|
|
stx y1 + 1
|
|
; Calculate again
|
|
jmp LINE
|
|
|
|
dx_positive:
|
|
; Calculate coords
|
|
jsr CALC
|
|
|
|
; dy = y2 - y1
|
|
lda y2
|
|
sub y1
|
|
sta dy
|
|
lda y2 + 1
|
|
sbc y1 + 1
|
|
sta dy + 1
|
|
|
|
; if dy is negative
|
|
bcs dy_positive
|
|
; dy = -dy
|
|
lda #0
|
|
sub dy
|
|
sta dy
|
|
lda #0
|
|
sbc dy + 1
|
|
sta dy + 1
|
|
; iy = -row_size
|
|
lda #<(65536 - x_res / ppb)
|
|
sta iy
|
|
lda #>(65536 - x_res / ppb)
|
|
sta iy + 1
|
|
bne skip_iy_1 ; always
|
|
|
|
dy_positive:
|
|
; iy = row_size
|
|
lda #<(x_res / ppb)
|
|
sta iy
|
|
lda #>(x_res / ppb)
|
|
sta iy + 1
|
|
skip_iy_1:
|
|
|
|
; dx2 = dx * 2
|
|
lda dx
|
|
asl a
|
|
sta dx2
|
|
lda dx + 1
|
|
rol a
|
|
sta dx2 + 1
|
|
|
|
; dy2 = dy * 2
|
|
lda dy
|
|
asl a
|
|
sta dy2
|
|
lda dy + 1
|
|
rol a
|
|
sta dy2 + 1
|
|
|
|
; if dx >= dy
|
|
lda dx
|
|
cmp dy
|
|
lda dx + 1
|
|
sbc dy + 1
|
|
bcc dy_major
|
|
|
|
; dx is the major axis
|
|
|
|
; err = dy2 - dx
|
|
lda dy2
|
|
sub dx
|
|
sta err
|
|
lda dy2 + 1
|
|
sbc dx + 1
|
|
sta err + 1
|
|
|
|
.scope
|
|
loop: ; main loop
|
|
put_pixel
|
|
; if err >= 0
|
|
lda err + 1
|
|
bmi err_neg
|
|
; err -= dx2
|
|
lda err
|
|
sub dx2
|
|
sta err
|
|
lda err + 1
|
|
sbc dx2 + 1
|
|
sta err + 1
|
|
; move_vertical (iy)
|
|
lda sptr
|
|
add iy
|
|
sta sptr
|
|
lda sptr + 1
|
|
adc iy + 1
|
|
sta sptr + 1
|
|
err_neg:
|
|
; err += dy2
|
|
lda err
|
|
add dy2
|
|
sta err
|
|
lda err + 1
|
|
adc dy2 + 1
|
|
sta err + 1
|
|
; move_right
|
|
inx
|
|
cpx #ppb
|
|
bne end_move
|
|
ldx #0
|
|
iny
|
|
bne end_move
|
|
inc sptr + 1
|
|
end_move:
|
|
; loop while dx-- >= 0
|
|
lda dx
|
|
ora dx + 1
|
|
beq exit
|
|
dec dx
|
|
lda dx
|
|
cmp #$FF
|
|
bne loop
|
|
dec dx + 1
|
|
jmp loop
|
|
exit: rts
|
|
.endscope
|
|
|
|
dy_major:
|
|
; dy is the major axis
|
|
|
|
; err = dx2 - dy;
|
|
lda dx2
|
|
sub dy
|
|
sta err
|
|
lda dx2 + 1
|
|
sbc dy + 1
|
|
sta err + 1
|
|
|
|
.scope
|
|
loop: ; main loop
|
|
put_pixel
|
|
; if err >= 0
|
|
lda err + 1
|
|
bmi end_move
|
|
; err -= dy2
|
|
lda err
|
|
sub dy2
|
|
sta err
|
|
lda err + 1
|
|
sbc dy2 + 1
|
|
sta err + 1
|
|
; move_right
|
|
inx
|
|
cpx #ppb
|
|
bne end_move
|
|
ldx #0
|
|
iny
|
|
bne end_move
|
|
inc sptr + 1
|
|
end_move:
|
|
; err += dx2
|
|
lda err
|
|
add dx2
|
|
sta err
|
|
lda err + 1
|
|
adc dx2 + 1
|
|
sta err + 1
|
|
; move_vertical(iy)
|
|
lda sptr
|
|
add iy
|
|
sta sptr
|
|
lda sptr + 1
|
|
adc iy + 1
|
|
sta sptr + 1
|
|
; loop while dy-- >= 0
|
|
lda dy
|
|
ora dy + 1
|
|
beq exit
|
|
dec dy
|
|
lda dy
|
|
cmp #$FF
|
|
bne loop
|
|
dec dy + 1
|
|
jmp loop
|
|
exit: rts
|
|
.endscope
|
|
.endif ; USE_CIO_LINE
|
|
.endproc
|
|
|
|
; ******************************************************************************
|
|
|
|
.proc clipped_bar
|
|
|
|
; ----------------------------------------------------------------------
|
|
;
|
|
; Clip and draw bar, this function will disappear when text clipping
|
|
; will be done int the TGI kernel
|
|
;
|
|
; ----------------------------------------------------------------------
|
|
|
|
.code
|
|
lda y1 + 1
|
|
bne off
|
|
lda y1
|
|
cmp #y_res
|
|
bcs off
|
|
|
|
lda x1 + 1
|
|
|
|
.if >(::x_res - 1) > 0
|
|
cmp #>x_res
|
|
bcc check2
|
|
.endif
|
|
|
|
bne off
|
|
lda x1
|
|
cmp #<x_res
|
|
bcc check2
|
|
off: rts
|
|
|
|
check2: lda y2 + 1
|
|
bne off
|
|
lda y2
|
|
cmp #y_res
|
|
bcs off
|
|
|
|
lda x2 + 1
|
|
|
|
.if >(::x_res - 1) > 0
|
|
cmp #>x_res
|
|
bcc BAR
|
|
.endif
|
|
|
|
bne off
|
|
lda x2
|
|
cmp #<x_res
|
|
bcs off
|
|
.endproc
|
|
|
|
; ******************************************************************************
|
|
|
|
.proc BAR
|
|
|
|
; ----------------------------------------------------------------------
|
|
;
|
|
; BAR: Draw a filled rectangle with the corners at x1,y1,x2,y2
|
|
;
|
|
; ----------------------------------------------------------------------
|
|
|
|
; locals
|
|
lmem := sreg
|
|
.bss
|
|
lmask: .res 1
|
|
rmask: .res 1
|
|
dy: .res 1
|
|
dx: .res 1
|
|
fmask: .res 1
|
|
.code
|
|
; dy = y2 - y1 + 1
|
|
lda y2
|
|
sub y1
|
|
sta dy
|
|
inc dy
|
|
; Calculate upper left corner
|
|
jsr CALC
|
|
; Save the values
|
|
tya
|
|
add sptr
|
|
sta lmem
|
|
lda sptr + 1
|
|
adc #0
|
|
sta lmem + 1
|
|
lda bar_table,x
|
|
sta lmask
|
|
; Calculate upper right corner
|
|
lda x2
|
|
sta x1
|
|
|
|
.if >(::x_res - 1) > 0
|
|
lda x2 + 1
|
|
sta x1 + 1
|
|
.endif
|
|
|
|
jsr CALC
|
|
; Save the values
|
|
tya
|
|
add sptr
|
|
sta sptr
|
|
bcc skips
|
|
inc sptr + 1
|
|
skips: inx
|
|
lda bar_table,x
|
|
eor #$FF
|
|
sta rmask
|
|
; Calculate memory difference between x1 and x2
|
|
lda sptr
|
|
sub lmem
|
|
sta dx
|
|
loop: ; Main loop
|
|
ldy #0
|
|
ldx dx
|
|
beq same
|
|
; Left
|
|
lda (lmem),y
|
|
eor mask
|
|
and lmask
|
|
eor (lmem),y
|
|
sta (lmem),y
|
|
iny
|
|
; Between
|
|
lda mask
|
|
jmp next
|
|
btwn: sta (lmem),y
|
|
iny
|
|
next: dex
|
|
bne btwn
|
|
; Right
|
|
lda (lmem),y
|
|
eor mask
|
|
and rmask
|
|
eor (lmem),y
|
|
sta (lmem),y
|
|
jmp cont
|
|
same: ; Same byte
|
|
lda lmask
|
|
and rmask
|
|
sta fmask
|
|
lda (lmem),y
|
|
eor mask
|
|
and fmask
|
|
eor (lmem),y
|
|
sta (lmem),y
|
|
cont: ; Go to next row
|
|
lda lmem
|
|
add #<(x_res / ppb)
|
|
sta lmem
|
|
bcc skipm
|
|
inc lmem + 1
|
|
skipm: ; Loop while --dy > 0
|
|
dec dy
|
|
bne loop
|
|
|
|
rts
|
|
|
|
.endproc
|
|
|
|
; ******************************************************************************
|
|
|
|
.proc TEXTSTYLE
|
|
|
|
; ----------------------------------------------------------------------
|
|
;
|
|
; TEXTSTYLE: Set text style. Scale factors in X and Y and direction in A
|
|
;
|
|
; ----------------------------------------------------------------------
|
|
|
|
.code
|
|
stx mag_x
|
|
sty mag_y
|
|
; Save text direction in bit 8 so that we can use BIT instruction later
|
|
lsr a
|
|
ror a
|
|
sta text_dir
|
|
; Save 8 * scaling factors
|
|
lda #0
|
|
sta mag_x8 + 1
|
|
sta mag_y8 + 1
|
|
; Save 8 * mag_x
|
|
txa
|
|
|
|
.repeat 3
|
|
asl a
|
|
rol mag_x8 + 1
|
|
.endrepeat
|
|
|
|
sta mag_x8
|
|
; Save 8 * mag_y
|
|
tya
|
|
|
|
.repeat 3
|
|
asl a
|
|
rol mag_y8 + 1
|
|
.endrepeat
|
|
|
|
sta mag_y8
|
|
; Done!
|
|
rts
|
|
.endproc
|
|
|
|
; ******************************************************************************
|
|
|
|
.proc OUTTEXT
|
|
|
|
; ----------------------------------------------------------------------
|
|
;
|
|
; OUTTEXT: Draw text at x1, y1. String is in ptr3
|
|
;
|
|
; ----------------------------------------------------------------------
|
|
|
|
; locals
|
|
string := tmp1
|
|
cols := tmp3
|
|
pixels := tmp4
|
|
font := regsave
|
|
.rodata
|
|
ataint: .byte 64,0,32,96
|
|
.bss
|
|
rows: .res 1
|
|
|
|
.if >(::x_res - 1) > 0
|
|
oldx1: .res 2
|
|
oldx2: .res 2
|
|
.else
|
|
oldx1: .res 1
|
|
oldx2: .res 1
|
|
.endif
|
|
|
|
oldy1: .res 1
|
|
oldy2: .res 1
|
|
inv: .res 1
|
|
|
|
.code
|
|
; Don't draw zero sized characters
|
|
lda mag_x
|
|
ora mag_y
|
|
bne not0
|
|
rts
|
|
|
|
not0: ; Save string address, ptr3 is needed by BAR
|
|
lda ptr3
|
|
sta string
|
|
lda ptr3 + 1
|
|
sta string + 1
|
|
|
|
bit text_dir
|
|
bmi vert
|
|
|
|
; Calculate x2
|
|
lda mag_x
|
|
sub #1
|
|
add x1
|
|
sta x2
|
|
|
|
.if >(::x_res - 1) > 0
|
|
lda x1 + 1
|
|
adc #0
|
|
sta x2 + 1
|
|
.else
|
|
lda #0
|
|
sta x2 + 1
|
|
.endif
|
|
|
|
; Calculate y2 and adjust y1
|
|
dec y1
|
|
lda y1
|
|
sta y2
|
|
sub mag_y
|
|
add #1
|
|
sta y1
|
|
lda #0
|
|
sta y2 + 1
|
|
|
|
jmp while
|
|
|
|
; Calculate for vertical text
|
|
vert: lda x1
|
|
sub #1
|
|
sta x2
|
|
lda x1 + 1
|
|
sbc #0
|
|
sta x2 + 1
|
|
lda x1
|
|
sub mag_y
|
|
sta x1
|
|
lda x1 + 1
|
|
sbc #0
|
|
sta x1 + 1
|
|
|
|
lda mag_x
|
|
sub #1
|
|
add y1
|
|
sta y2
|
|
lda #0
|
|
sta y2 + 1
|
|
jmp while
|
|
|
|
; Main loop
|
|
loop: inc string
|
|
bne skiph
|
|
inc string + 1
|
|
skiph: ; Save coords
|
|
bit text_dir
|
|
bmi scvert
|
|
|
|
ldx y1
|
|
stx oldy1
|
|
ldx y2
|
|
stx oldy2
|
|
jmp draw
|
|
|
|
scvert: ldx x1
|
|
stx oldx1
|
|
ldx x2
|
|
stx oldx2
|
|
|
|
.if >(::x_res - 1) > 0
|
|
ldx x1 + 1
|
|
stx oldx1 + 1
|
|
ldx x2 + 1
|
|
stx oldx2 + 1
|
|
.endif
|
|
|
|
; Draw one character
|
|
; Convert to ANTIC code
|
|
draw: tay
|
|
rol a
|
|
rol a
|
|
rol a
|
|
rol a
|
|
and #3
|
|
tax
|
|
tya
|
|
and #$9f
|
|
ora ataint,x
|
|
; Save and clear inverse video bit
|
|
sta inv
|
|
and #$7F
|
|
; Calculate font data address
|
|
sta font
|
|
lda #0
|
|
sta font + 1
|
|
|
|
.repeat 3
|
|
asl font
|
|
rol a
|
|
.endrepeat
|
|
|
|
adc CHBAS
|
|
sta font + 1
|
|
; Save old coords
|
|
bit text_dir
|
|
bpl hor
|
|
lda y1
|
|
sta oldy1
|
|
lda y2
|
|
sta oldy2
|
|
jmp cont
|
|
hor: lda x1
|
|
sta oldx1
|
|
lda x2
|
|
sta oldx2
|
|
|
|
.if >(::x_res - 1) > 0
|
|
lda x1 + 1
|
|
sta oldx1 + 1
|
|
lda x2 + 1
|
|
sta oldx2 + 1
|
|
.endif
|
|
|
|
; Get glyph pixels
|
|
cont: ldy #7
|
|
; Put one row of the glyph
|
|
putrow: sty rows
|
|
lda (font),y
|
|
bit inv
|
|
bpl noinv
|
|
eor #$FF
|
|
noinv: sta pixels
|
|
lda #7
|
|
sta cols
|
|
; Put one column of the row
|
|
putcol: asl pixels
|
|
bcc next_col
|
|
lda x1
|
|
pha
|
|
lda x1 + 1
|
|
pha
|
|
jsr clipped_bar
|
|
pla
|
|
sta x1 + 1
|
|
pla
|
|
sta x1
|
|
next_col:
|
|
; Go to next column
|
|
; increase x coords
|
|
bit text_dir
|
|
bmi vertinc
|
|
|
|
lda mag_x
|
|
add x1
|
|
sta x1
|
|
bcc L1
|
|
inc x1 + 1
|
|
L1: lda mag_x
|
|
add x2
|
|
sta x2
|
|
bcc L2
|
|
inc x2 + 1
|
|
jmp L2
|
|
|
|
vertinc:
|
|
lda y1
|
|
sub mag_x
|
|
sta y1
|
|
lda y2
|
|
sub mag_x
|
|
sta y2
|
|
L2:
|
|
dec cols
|
|
bpl putcol
|
|
next_row:
|
|
; Go to next row
|
|
bit text_dir
|
|
bmi verty
|
|
|
|
lda y1
|
|
sub mag_y
|
|
sta y1
|
|
bcs L3
|
|
dec y1 + 1
|
|
L3: lda y2
|
|
sub mag_y
|
|
sta y2
|
|
bcs L6
|
|
dec y2 + 1
|
|
L4: jmp L6
|
|
|
|
verty: lda x1
|
|
sub mag_y
|
|
sta x1
|
|
bcs L5
|
|
dec x1 + 1
|
|
L5: lda x2
|
|
sub mag_y
|
|
sta x2
|
|
bcs L6
|
|
dec x2 + 1
|
|
L6:
|
|
; Restore old values
|
|
bit text_dir
|
|
bpl reshor
|
|
lda oldy1
|
|
sta y1
|
|
lda oldy2
|
|
sta y2
|
|
jmp nextrow
|
|
reshor: lda oldx1
|
|
sta x1
|
|
lda oldx2
|
|
sta x2
|
|
|
|
.if >(::x_res - 1) > 0
|
|
lda oldx1 + 1
|
|
sta x1 + 1
|
|
lda oldx2 + 1
|
|
sta x2 + 1
|
|
.endif
|
|
|
|
; Next row
|
|
nextrow:
|
|
ldy rows
|
|
dey
|
|
jpl putrow
|
|
|
|
; Restore coords
|
|
bit text_dir
|
|
bmi resvert
|
|
|
|
ldx oldy1
|
|
stx y1
|
|
ldx oldy2
|
|
stx y2
|
|
ldx #0
|
|
stx y1 + 1
|
|
stx y2 + 1
|
|
|
|
lda mag_x8
|
|
add x1
|
|
sta x1
|
|
lda mag_x8 + 1
|
|
adc x1 + 1
|
|
sta x1 + 1
|
|
lda mag_x8
|
|
add x2
|
|
sta x2
|
|
lda mag_x8 + 1
|
|
adc x2 + 1
|
|
sta x2 + 1
|
|
|
|
jmp while
|
|
|
|
resvert:
|
|
ldx oldx1
|
|
stx x1
|
|
ldx oldx2
|
|
stx x2
|
|
|
|
.if >(::x_res - 1) > 0
|
|
ldx oldx1 + 1
|
|
stx x1 + 1
|
|
ldx oldx2 + 1
|
|
stx x2 + 1
|
|
.endif
|
|
|
|
lda y1
|
|
sub mag_x8
|
|
sta y1
|
|
lda y1 +1
|
|
sbc mag_x8 + 1
|
|
sta y1 + 1
|
|
lda y2
|
|
sub mag_x8
|
|
sta y2
|
|
lda y2 +1
|
|
sbc mag_x8 + 1
|
|
sta y2 + 1
|
|
|
|
; End of loop
|
|
while: ldy #0
|
|
lda (string),y
|
|
jne loop ; Check for null character
|
|
rts
|
|
|
|
.endproc
|
|
|
|
.if pages = 2
|
|
; ******************************************************************************
|
|
|
|
.proc SETVIEWPAGE
|
|
|
|
; ----------------------------------------------------------------------
|
|
;
|
|
; SETVIEWPAGE, page in A
|
|
;
|
|
; ----------------------------------------------------------------------
|
|
|
|
.code
|
|
tax
|
|
beq cont
|
|
lda #32
|
|
|
|
cont: add p0dls
|
|
cmp SDLSTH
|
|
beq done ; We're already in the desired page
|
|
|
|
ldx RTCLOK + 2
|
|
sta SDLSTH
|
|
|
|
; Wait until next VBLANK
|
|
wait: cpx RTCLOK + 2
|
|
beq wait
|
|
|
|
; Done
|
|
done: rts
|
|
.endproc
|
|
|
|
; ******************************************************************************
|
|
|
|
.proc SETDRAWPAGE
|
|
|
|
; ----------------------------------------------------------------------
|
|
;
|
|
; SETDRAWPAGE, page in A
|
|
;
|
|
; ----------------------------------------------------------------------
|
|
|
|
.code
|
|
tax
|
|
beq cont
|
|
lda #32
|
|
cont: add p0scr
|
|
sta SAVMSC + 1
|
|
rts
|
|
.endproc
|
|
.endif
|
|
|
|
; ******************************************************************************
|
|
|
|
; ----------------------------------------------------------------------
|
|
;
|
|
; Unimplemented functions that require an error code
|
|
;
|
|
; ----------------------------------------------------------------------
|
|
|
|
CONTROL:
|
|
lda #TGI_ERR_INV_FUNC
|
|
sta error
|
|
; fall through
|
|
|
|
; ******************************************************************************
|
|
|
|
; ----------------------------------------------------------------------
|
|
;
|
|
; Unimplemented functions that don't require an error code
|
|
;
|
|
; ----------------------------------------------------------------------
|
|
|
|
INSTALL:
|
|
UNINSTALL:
|
|
|
|
.if pages = 1
|
|
SETVIEWPAGE:
|
|
SETDRAWPAGE:
|
|
.endif
|
|
|
|
rts
|