287 lines
6.0 KiB
ArmAsm
287 lines
6.0 KiB
ArmAsm
;
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; painting.s
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; General rendering routines for 80 column text elements
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;
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; Created by Quinn Dunki on 8/15/14.
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; Copyright (c) 2014 One Girl, One Laptop Productions. All rights reserved.
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;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGDesktop
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; Paints the desktop pattern (assumes 80 cols)
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;
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WGDesktop:
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pha
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lda #'W'
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sta WGClearScreen_charPage1+1
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lda #'V'
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bra WGClearScreen_common
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGClearScreen
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; Clears the text screen (assumes 80 cols)
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;
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WGClearScreen:
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pha
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lda #' ' + $80
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sta WGClearScreen_charPage1+1
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WGClearScreen_common:
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sta WGClearScreen_charPage2+1
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SAVE_XY
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SETSWITCH PAGE2OFF
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ldx #23
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WGClearScreen_lineLoop:
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lda TEXTLINES_L,x ; Compute video memory address of line
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sta WGClearScreen_charLoop1+1
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sta WGClearScreen_charLoop2+1
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lda TEXTLINES_H,x
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sta WGClearScreen_charLoop1+2
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sta WGClearScreen_charLoop2+2
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ldy #39
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WGClearScreen_charPage1:
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lda #$FF ; Self-modifying code!
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WGClearScreen_charLoop1:
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sta $FFFF,y ; Self-modifying code!
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dey
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bpl WGClearScreen_charLoop1
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SETSWITCH PAGE2ON
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ldy #39
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WGClearScreen_charPage2:
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lda #$FF ; Self-modifying code!
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WGClearScreen_charLoop2:
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sta $FFFF,y ; Self-modifying code!
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dey
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bpl WGClearScreen_charLoop2
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SETSWITCH PAGE2OFF
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dex
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bpl WGClearScreen_lineLoop
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RESTORE_XY
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pla
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGPlot
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; Plots a character at global cursor position (assumes 80 cols)
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; A: Character to plot (Apple format)
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; Side effects: Clobbers BASL,BASH
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;
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WGPlot:
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SAVE_XY
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pha
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ldx WG_CURSORY
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lda TEXTLINES_L,x ; Compute video memory address of point
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sta BASL
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lda TEXTLINES_H,x
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sta BASH
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lda WG_CURSORX
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lsr
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clc
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adc BASL
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sta BASL
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bcc WGPlot_SkipInc
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inc BASH
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WGPlot_SkipInc:
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lda WG_CURSORX ; X even?
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ror
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bcs WGPlot_xOdd
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SETSWITCH PAGE2ON ; Plot the character
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pla
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sta (BASL)
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jmp WGPlot_done
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WGPlot_xOdd:
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SETSWITCH PAGE2OFF ; Plot the character
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pla
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sta (BASL)
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WGPlot_done:
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SETSWITCH PAGE2OFF
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RESTORE_XY
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGPrint
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; Prints a null-terminated ASCII string at the current view's
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; cursor position. Clips to current view.
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; PARAM0: String pointer, LSB
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; PARAM1: String pointer, MSB
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; V: If set, characters are printed raw with no high bit alterations
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; Side effects: Clobbers SA,BASL,BASH
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;
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WGPrint:
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SAVE_AXY
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SAVE_ZPS
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lda #%10000000
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ldx #%00111111
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bvc WGPrint_setupMask
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lda #0
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ldx #$ff
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clv
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WGPrint_setupMask:
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sta WGPrint_specialMask
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stx WGPrint_setupMaskInverse
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; Start checking clipping boundaries
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lda WG_LOCALCURSORY
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cmp WG_VIEWCLIP+3
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bcs WGPrint_leapDone ; Entire string is below the clip box
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jsr WGStrLen ; We'll need the length of the string
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sta SCRATCH1
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LDX_ACTIVEVIEW ; Cache view width for later
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lda WG_VIEWRECORDS+7,x
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sta WG_SCRATCHA
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ldy #0
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WGPrint_lineLoopFirst: ; Calculating start of first line is slightly different
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lda WG_LOCALCURSORY
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cmp WG_VIEWCLIP+1
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bcc WGPrint_skipToEndFirst ; This line is above the clip box
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lda WG_LOCALCURSORX ; Find start of line within clip box
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cmp WG_VIEWCLIP+0
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bcs WGPrint_visibleChars
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lda WG_VIEWCLIP+0 ; Line begins before left clip plane
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sec ; Advance string index and advance cursor into clip box
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sbc WG_LOCALCURSORX
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tay
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lda WG_VIEWCLIP+0
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sta WG_LOCALCURSORX
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bra WGPrint_visibleChars
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WGPrint_leapDone:
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bra WGPrint_done
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WGPrint_skipToEndFirst:
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lda WG_SCRATCHA ; Skip string index ahead by distance to EOL
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sec
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sbc WG_LOCALCURSORX
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cmp SCRATCH1
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bcs WGPrint_done ; EOL is past the end of the string, so we're done
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tay
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lda WG_SCRATCHA ; Skip cursor ahead to EOL
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sta WG_LOCALCURSORX
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bra WGPrint_nextLine
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WGPrint_skipToEnd:
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tya ; Skip string index ahead by distance to EOL
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clc
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adc WG_SCRATCHA
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cmp SCRATCH1
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bcs WGPrint_done ; EOL is past the end of the string, so we're done
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tay
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lda WG_SCRATCHA ; Skip cursor ahead to EOL
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sta WG_LOCALCURSORX
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bra WGPrint_nextLine
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WGPrint_lineLoop:
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lda WG_LOCALCURSORY
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cmp WG_VIEWCLIP+1
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bcc WGPrint_skipToEnd ; This line is above the clip box
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lda WG_LOCALCURSORX ; Find start of line within clip box
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cmp WG_VIEWCLIP+0
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bcs WGPrint_visibleChars
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tya
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clc
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adc WG_VIEWCLIP+0 ; Jump ahead by left span
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tay
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lda WG_VIEWCLIP+0 ; Set cursor to left edge of visible area
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sta WG_LOCALCURSORX
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WGPrint_visibleChars:
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jsr WGSyncGlobalCursor
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lda INVERSE
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cmp #CHAR_INVERSE
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beq WGPrint_charLoopInverse
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WGPrint_charLoopNormal:
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lda (PARAM0),y ; Draw current character
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beq WGPrint_done
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ora WGPrint_specialMask
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jsr WGPlot
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iny
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inc WG_CURSORX ; Advance cursors
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inc WG_LOCALCURSORX
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lda WG_LOCALCURSORX
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cmp WG_SCRATCHA ; Check for wrap boundary
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beq WGPrint_nextLine
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cmp WG_VIEWCLIP+2 ; Check for right clip plane
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beq WGPrint_endVisible
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bra WGPrint_charLoopNormal
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WGPrint_done: ; This is in the middle here to keep local branches in range
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RESTORE_ZPS
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RESTORE_AXY
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rts
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WGPrint_endVisible:
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tya
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clc
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adc WG_VIEWCLIP+4 ; Advance string index by right span
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cmp SCRATCH1
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bcs WGPrint_done
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tay
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WGPrint_nextLine:
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inc WG_LOCALCURSORY ; Advance cursor
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lda WG_LOCALCURSORY
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cmp WG_VIEWCLIP+3 ; Check for bottom clip plane
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beq WGPrint_done
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cmp WG_VIEWRECORDS+8,x ; Check for bottom of view
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beq WGPrint_done
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lda (PARAM0),y ; Check for end string landing exactly at line end
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beq WGPrint_done
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stz WG_LOCALCURSORX
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bra WGPrint_lineLoop
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WGPrint_charLoopInverse:
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lda (PARAM0),y ; Draw current character
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beq WGPrint_done
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cmp #$60
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bcc WGPrint_charLoopInverseLow
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and #%01111111 ; Inverse lowercase is in alternate character set
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bra WGPrint_charLoopInversePlot
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WGPrint_charLoopInverseLow:
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and WGPrint_setupMaskInverse ; Normal inverse
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WGPrint_charLoopInversePlot:
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jsr WGPlot
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iny
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inc WG_CURSORX ; Advance cursors
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inc WG_LOCALCURSORX
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lda WG_LOCALCURSORX
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cmp WG_SCRATCHA ; Check for wrap boundary
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beq WGPrint_nextLine
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cmp WG_VIEWCLIP+2 ; Check for right clip plane
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beq WGPrint_endVisible
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bra WGPrint_charLoopInverse
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WGPrint_specialMask:
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.byte 0
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WGPrint_setupMaskInverse:
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.byte 0
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