2021-09-23 20:19:35 +00:00
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* MAINMEM.GFX.S
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* (c) Bobbi 2021 GPLv3
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*
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* Main memory HGR graphics routines.
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* Call FDraw Clear routine
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2021-09-23 22:16:21 +00:00
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CLRHGR >>> ENTMAIN
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LDA BGCOLOR
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STA FDRAWADDR+5
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JSR FDRAWADDR+16 ; FDRAW: SetColor
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JSR FDRAWADDR+22 ; FDRAW: Clear
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LDA FGCOLOR
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STA FDRAWADDR+5
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JSR FDRAWADDR+16 ; FDRAW: SetColor
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>>> XF2AUX,VDU16RET
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2021-09-23 20:19:35 +00:00
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* Call FDraw SetLineMode routine
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2021-09-23 22:16:21 +00:00
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SETLINE >>> ENTMAIN
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JSR FDRAWADDR+43 ; FDRAW: SetLineMode
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>>> XF2AUX,VDU18RET1
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2021-09-23 20:19:35 +00:00
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* Call FDraw DrawLine routine
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2021-09-23 22:16:21 +00:00
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DRAWLINE >>> ENTMAIN
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LDA PLOTMODE
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AND #$03
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CMP #$01 ; Draw in foreground colour
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BNE :S1
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LDA FGCOLOR
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BRA :SETCOLOR
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:S1 CMP #$02 ; Draw in inverse colour
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BNE :S2
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SEC
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LDA #$07
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SBC FGCOLOR
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BRA :SETCOLOR
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:S2 LDA BGCOLOR ; Draw in background colour
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:SETCOLOR STA FDRAWADDR+5
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JSR FDRAWADDR+16 ; FDRAW: SetColor
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JSR FDRAWADDR+28 ; FDRAW: DrawLine
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>>> XF2AUX,VDU25RET
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2021-09-23 20:19:35 +00:00
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* Call FDraw DrawPoint routine
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2021-09-23 22:16:21 +00:00
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DRAWPNT >>> ENTMAIN
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LDA PLOTMODE
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AND #$03
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CMP #$01 ; Draw in foreground colour
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BNE :S1
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LDA FGCOLOR
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BRA :SETCOLOR
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:S1 CMP #$02 ; Draw in inverse colour
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BNE :S2
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SEC
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LDA #$07
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SBC FGCOLOR
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BRA :SETCOLOR
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:S2 LDA BGCOLOR ; Draw in background colour
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:SETCOLOR STA FDRAWADDR+5
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JSR FDRAWADDR+16 ; FDRAW: SetColor
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JSR FDRAWADDR+25 ; FDRAW: DrawPoint
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>>> XF2AUX,VDU25RET
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2021-09-23 20:19:35 +00:00
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* Reset colours and linetype
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2021-09-23 22:16:21 +00:00
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GFXINIT JSR FDRAWADDR+0 ; Initialize FDRAW library
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LDA #$20
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STA FDRAWADDR+5
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JSR FDRAWADDR+19 ; FDRAW: Set page $2000
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STZ LINETYPE
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STZ FDRAWADDR+5
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JSR FDRAWADDR+43 ; FDRAW: SetLineMode
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LDA #$07
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STA FGCOLOR
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STA FDRAWADDR+5
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JSR FDRAWADDR+16 ; FDRAW: SetColor
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STZ BGCOLOR
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JSR FDRAWADDR+22 ; FDRAW: clear HGR screen
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RTS
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2021-09-23 20:19:35 +00:00
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2021-09-23 20:50:16 +00:00
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* Plot bitmap character on the HGR screen
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2021-09-23 21:56:39 +00:00
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* On entry: char is in A
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2021-09-23 22:16:21 +00:00
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DRAWCHAR >>> ENTMAIN
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AND #$7F
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STA A1L ; A*8 -> A1L,A1H
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STZ A1H
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ASL A1L
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ROL A1H
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ASL A1L
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ROL A1H
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ASL A1L
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ROL A1H
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CLC ; FONTADDR+A*8 -> A1L,A1H
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LDA A1L
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ADC #<FONTADDR
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STA A1L
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LDA A1H
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ADC #>FONTADDR
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STA A1H
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LDA HGRADDR+0 ; HGRADDR -> A4L,A4H
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STA A4L
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LDA HGRADDR+1
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STA A4H
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LDY #$00
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:L1 LDA (A1L),Y ; Load line of pixels from font
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STA (A4L) ; Store them on screen
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INC A4H ; Skip 1024 bytes to next row
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INC A4H
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INC A4H
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INC A4H
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INY
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CPY #$08 ; All eight rows done?
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BNE :L1
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>>> XF2AUX,PUTCHRET
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FGCOLOR DB $00 ; Foreground colour
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BGCOLOR DB $00 ; Background colour
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LINETYPE DB $00 ; 0 normal, 1 XOR
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PLOTMODE DB $00 ; K value for PLOT K,X,Y
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HGRADDR DW $0000 ; Address 1st line of HGR char
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2021-09-23 20:19:35 +00:00
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