289 lines
5.5 KiB
ArmAsm
289 lines
5.5 KiB
ArmAsm
;
|
|
; painting.s
|
|
; General rendering routines for 80 column text elements
|
|
;
|
|
; Created by Quinn Dunki on 8/15/14.
|
|
; Copyright (c) 2014 One Girl, One Laptop Productions. All rights reserved.
|
|
;
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; WGClearScreen
|
|
; Clears the text screen (assumes 80 cols)
|
|
; Side effects: Clobbers BASL,BASH
|
|
;
|
|
WGClearScreen:
|
|
|
|
SAVE_AXY
|
|
SETSWITCH PAGE2OFF
|
|
ldx #23
|
|
|
|
WGClearScreen_lineLoop:
|
|
|
|
lda TEXTLINES_L,x ; Compute video memory address of line
|
|
sta BASL
|
|
lda TEXTLINES_H,x
|
|
sta BASH
|
|
|
|
ldy #39
|
|
lda #' ' + $80
|
|
|
|
WGClearScreen_charLoop:
|
|
sta (BASL),y
|
|
SETSWITCH PAGE2ON
|
|
sta (BASL),y
|
|
SETSWITCH PAGE2OFF
|
|
dey
|
|
bpl WGClearScreen_charLoop
|
|
|
|
dex
|
|
bpl WGClearScreen_lineLoop
|
|
|
|
RESTORE_AXY
|
|
rts
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; WGDesktop
|
|
; Paints the desktop pattern (assumes 80 cols)
|
|
; Side effects: Clobbers BASL,BASH
|
|
;
|
|
WGDesktop:
|
|
|
|
SAVE_AXY
|
|
SETSWITCH PAGE2OFF
|
|
ldx #23
|
|
|
|
WGDesktop_lineLoop:
|
|
lda TEXTLINES_L,x ; Compute video memory address of line
|
|
sta BASL
|
|
lda TEXTLINES_H,x
|
|
sta BASH
|
|
|
|
ldy #39
|
|
|
|
WGDesktop_charLoop:
|
|
lda #'W'
|
|
sta (BASL),y
|
|
SETSWITCH PAGE2ON
|
|
lda #'V'
|
|
sta (BASL),y
|
|
SETSWITCH PAGE2OFF
|
|
dey
|
|
bpl WGDesktop_charLoop
|
|
|
|
dex
|
|
bpl WGDesktop_lineLoop
|
|
|
|
RESTORE_AXY
|
|
rts
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; WGPlot
|
|
; Plots a character at global cursor position (assumes 80 cols)
|
|
; A: Character to plot (Apple format)
|
|
; Side effects: Clobbers BASL,BASH
|
|
;
|
|
WGPlot:
|
|
SAVE_XY
|
|
pha
|
|
|
|
ldx WG_CURSORY
|
|
lda TEXTLINES_L,x ; Compute video memory address of point
|
|
sta BASL
|
|
lda TEXTLINES_H,x
|
|
sta BASH
|
|
|
|
lda WG_CURSORX
|
|
lsr
|
|
clc
|
|
adc BASL
|
|
sta BASL
|
|
lda #$0
|
|
adc BASH
|
|
sta BASH
|
|
|
|
lda WG_CURSORX ; X even?
|
|
and #$01
|
|
bne WGPlot_xOdd
|
|
|
|
SETSWITCH PAGE2ON ; Plot the character
|
|
pla
|
|
sta (BASL)
|
|
jmp WGPlot_done
|
|
|
|
WGPlot_xOdd:
|
|
SETSWITCH PAGE2OFF ; Plot the character
|
|
pla
|
|
sta (BASL)
|
|
|
|
WGPlot_done:
|
|
RESTORE_XY
|
|
rts
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; WGPrint
|
|
; Prints a null-terminated ASCII string at the current view's
|
|
; cursor position. Clips to current view.
|
|
; PARAM0: String pointer, LSB
|
|
; PARAM1: String pointer, MSB
|
|
; Side effects: Clobbers SA,BASL,BASH
|
|
;
|
|
WGPrint:
|
|
SAVE_AXY
|
|
SAVE_ZPS
|
|
|
|
lda WG_LOCALCURSORY
|
|
cmp WG_VIEWCLIP+3
|
|
bcs WGPrint_leapDone ; Entire string is below the clip box
|
|
|
|
jsr WGStrLen ; We'll need the length of the string
|
|
sta SCRATCH1
|
|
|
|
LDX_ACTIVEVIEW ; Cache view width for later
|
|
lda WG_VIEWRECORDS+7,x
|
|
sta WG_SCRATCHA
|
|
|
|
ldy #0
|
|
|
|
WGPrint_lineLoopFirst: ; Calculating start of first line is slightly different
|
|
lda WG_LOCALCURSORY
|
|
cmp WG_VIEWCLIP+1
|
|
bcc WGPrint_skipToEndFirst ; This line is above the clip box
|
|
|
|
lda WG_LOCALCURSORX ; Find start of line within clip box
|
|
cmp WG_VIEWCLIP+0
|
|
bcs WGPrint_visibleChars
|
|
|
|
lda WG_VIEWCLIP+0 ; Line begins before left clip plane
|
|
sec ; Advance string index and advance cursor into clip box
|
|
sbc WG_LOCALCURSORX
|
|
tay
|
|
lda WG_VIEWCLIP+0
|
|
sta WG_LOCALCURSORX
|
|
bra WGPrint_visibleChars
|
|
|
|
WGPrint_leapDone:
|
|
bra WGPrint_done
|
|
|
|
WGPrint_skipToEndFirst:
|
|
lda WG_SCRATCHA ; Skip string index ahead by distance to EOL
|
|
sec
|
|
sbc WG_LOCALCURSORX
|
|
cmp SCRATCH1
|
|
bcs WGPrint_done ; EOL is past the end of the string, so we're done
|
|
tay
|
|
|
|
lda WG_SCRATCHA ; Skip cursor ahead to EOL
|
|
sta WG_LOCALCURSORX
|
|
bra WGPrint_nextLine
|
|
|
|
WGPrint_skipToEnd:
|
|
tya ; Skip string index ahead by distance to EOL
|
|
clc
|
|
adc WG_SCRATCHA
|
|
cmp SCRATCH1
|
|
bcs WGPrint_done ; EOL is past the end of the string, so we're done
|
|
tay
|
|
|
|
lda WG_SCRATCHA ; Skip cursor ahead to EOL
|
|
sta WG_LOCALCURSORX
|
|
bra WGPrint_nextLine
|
|
|
|
WGPrint_lineLoop:
|
|
lda WG_LOCALCURSORY
|
|
cmp WG_VIEWCLIP+1
|
|
bcc WGPrint_skipToEnd ; This line is above the clip box
|
|
|
|
lda WG_LOCALCURSORX ; Find start of line within clip box
|
|
cmp WG_VIEWCLIP+0
|
|
bcs WGPrint_visibleChars
|
|
|
|
tya
|
|
clc
|
|
adc WG_VIEWCLIP+0 ; Jump ahead by left span
|
|
tay
|
|
|
|
lda WG_VIEWCLIP+0 ; Set cursor to left edge of visible area
|
|
sta WG_LOCALCURSORX
|
|
|
|
WGPrint_visibleChars:
|
|
jsr WGSyncGlobalCursor
|
|
|
|
lda INVERSE
|
|
cmp #CHAR_INVERSE
|
|
beq WGPrint_charLoopInverse
|
|
|
|
WGPrint_charLoopNormal:
|
|
lda (PARAM0),y ; Draw current character
|
|
beq WGPrint_done
|
|
ora #%10000000
|
|
jsr WGPlot
|
|
iny
|
|
|
|
inc WG_CURSORX ; Advance cursors
|
|
inc WG_LOCALCURSORX
|
|
|
|
lda WG_LOCALCURSORX
|
|
cmp WG_SCRATCHA ; Check for wrap boundary
|
|
beq WGPrint_nextLine
|
|
cmp WG_VIEWCLIP+2 ; Check for right clip plane
|
|
beq WGPrint_endVisible
|
|
bra WGPrint_charLoopNormal
|
|
|
|
WGPrint_done: ; This is in the middle here to keep local branches in range
|
|
RESTORE_ZPS
|
|
RESTORE_AXY
|
|
rts
|
|
|
|
WGPrint_endVisible:
|
|
tya
|
|
clc
|
|
adc WG_VIEWCLIP+4 ; Advance string index by right span
|
|
cmp SCRATCH1
|
|
bcs WGPrint_done
|
|
tay
|
|
|
|
WGPrint_nextLine:
|
|
inc WG_LOCALCURSORY ; Advance cursor
|
|
lda WG_LOCALCURSORY
|
|
cmp WG_VIEWCLIP+3 ; Check for bottom clip plane
|
|
beq WGPrint_done
|
|
cmp WG_VIEWRECORDS+8,x ; Check for bottom of view
|
|
beq WGPrint_done
|
|
lda (PARAM0),y ; Check for end string landing exactly at line end
|
|
beq WGPrint_done
|
|
|
|
lda #0 ; Wrap to next line
|
|
sta WG_LOCALCURSORX
|
|
bra WGPrint_lineLoop
|
|
|
|
WGPrint_charLoopInverse:
|
|
lda (PARAM0),y ; Draw current character
|
|
beq WGPrint_done
|
|
cmp #$60
|
|
bcc WGPrint_charLoopInverseLow
|
|
and #%01111111 ; Inverse lowercase is in alternate character set
|
|
bra WGPrint_charLoopInversePlot
|
|
|
|
WGPrint_charLoopInverseLow:
|
|
and #%00111111 ; Normal inverse
|
|
|
|
WGPrint_charLoopInversePlot:
|
|
jsr WGPlot
|
|
iny
|
|
|
|
inc WG_CURSORX ; Advance cursors
|
|
inc WG_LOCALCURSORX
|
|
|
|
lda WG_LOCALCURSORX
|
|
cmp WG_SCRATCHA ; Check for wrap boundary
|
|
beq WGPrint_nextLine
|
|
cmp WG_VIEWCLIP+2 ; Check for right clip plane
|
|
beq WGPrint_endVisible
|
|
bra WGPrint_charLoopInverse
|
|
|