;**************************************** ;* FONT ENGINE (v3?) * ;* * ;* Dagen Brock * ;* 2013-07-20 * ;* Converted to ca65 by Quinn Dunki * ;* 2017-08-13 * ;**************************************** ;* A= ptr to string preceded by length * ;* X= screen location * ;* Preserves all registers * ;* Trashes zero page locations 6,7 * ;**************************************** ; each char: ; draw char at loc ; update loc ; see if length hit - no? back to draw char F_Length: .word 0 ;length of string (only one byte currently used) F_CharIdx: .word 0 ;index of current character F_CurrentPos: .word 0 ;current top left char position F_StrPtr = $06 ;pointer to string (including length byte) / DP DrawString: pha phx phy sta F_StrPtr ;store at dp 0 ($00) for indirect loads stx F_CurrentPos stz F_CharIdx lda (F_StrPtr) and #$00ff ;strip off first char (len is only one byte) sta F_Length ;get our length byte NextChar: lda F_CharIdx cmp F_Length bne notDone ply plx pla rts ;DONE! Return to caller notDone: inc F_CharIdx ldy F_CharIdx lda (F_StrPtr),y ;get next char! and #$00FF ;mask high byte sec sbc #' ' ;our table starts with space ' ' asl ;*2 tay ldx F_CurrentPos jsr drawChar inc F_CurrentPos ;compare to addition time (?) inc F_CurrentPos inc F_CurrentPos inc F_CurrentPos ;update screen pos (2 words=8 pixels) bra NextChar ;x = TopLeft screen pos ;y = char table offset drawChar: lda FontTable,y ;get real address of char data sec sbc #FontData ;pivot offset - now a is offset of fontdata tay ;so we'll index with that lda FontData,y sta $E12000,x lda FontData+2,y sta $E12000+2,x lda FontData+4,y sta $E12000+160,x lda FontData+6,y sta $E12000+160+2,x lda FontData+8,y sta $E12000+160*2,x lda FontData+10,y sta $E12000+160*2+2,x lda FontData+12,y sta $E12000+160*3,x lda FontData+14,y sta $E12000+160*3+2,x lda FontData+16,y sta $E12000+160*4,x lda FontData+18,y sta $E12000+160*4+2,x lda FontData+20,y sta $E12000+160*5,x lda FontData+22,y sta $E12000+160*5+2,x rts FontTable: .addr s_Space .addr s_Exclaim .addr s_Quote .addr s_Number .addr s_Dollar .addr s_Percent .addr s_Amper .addr s_Single .addr s_OpenParen .addr s_CloseParen .addr s_Asterix .addr s_Plus .addr s_Comma .addr s_Minus .addr s_Period .addr s_Slash .addr s_N0 .addr s_N1 .addr s_N2 .addr s_N3 .addr s_N4 .addr s_N5 .addr s_N6 .addr s_N7 .addr s_N8 .addr s_N9 .addr s_Colon .addr s_Semi .addr s_LAngle .addr s_Equal .addr s_RAngle .addr s_Question .addr s_At .addr s_A .addr s_B .addr s_C .addr s_D .addr s_E .addr s_F .addr s_G .addr s_H .addr s_I .addr s_J .addr s_K .addr s_L .addr s_M .addr s_N .addr s_O .addr s_P .addr s_Q .addr s_R .addr s_S .addr s_T .addr s_U .addr s_V .addr s_W .addr s_X .addr s_Y .addr s_Z .addr s_LBracket .addr s_BackSlash .addr s_RBracket .addr s_Caret .addr s_UnderLine FontData: s_Space: qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $00000000 s_Exclaim: qbyte $000FF000 qbyte $000FF000 qbyte $000FF000 qbyte $000FF000 qbyte $00000000 qbyte $000FF000 s_Quote: qbyte $0FF00FF0 qbyte $00F000F0 qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $00000000 s_Number: qbyte $00000000 qbyte $00F00F00 qbyte $0FFFFFF0 qbyte $00F00F00 qbyte $0FFFFFF0 qbyte $00F00F00 s_Dollar: qbyte $000F0F00 qbyte $00FFFFF0 qbyte $0F0F0F00 qbyte $00FFFF00 qbyte $000F0FF0 qbyte $0FFFFF00 s_Percent: qbyte $0FF000F0 qbyte $00000F00 qbyte $0000F000 qbyte $000F0000 qbyte $00F00000 qbyte $0F000FF0 s_Amper: qbyte $000FF000 qbyte $00F00F00 qbyte $0F00F000 qbyte $00F000F0 qbyte $0F0FFF00 qbyte $00F0F000 s_Single: qbyte $000FF000 qbyte $0000F000 qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $00000000 s_OpenParen: qbyte $000FF000 qbyte $00FF0000 qbyte $0FF00000 qbyte $0FF00000 qbyte $00FF0000 qbyte $000FF000 s_CloseParen: qbyte $000FF000 qbyte $0000FF00 qbyte $00000FF0 qbyte $00000FF0 qbyte $0000FF00 qbyte $000FF000 s_Asterix: qbyte $00000000 qbyte $00F0F0F0 qbyte $000FFF00 qbyte $00FFFFF0 qbyte $000FFF00 qbyte $00F0F0F0 s_Plus: qbyte $000F0000 qbyte $000F0000 qbyte $0FFFFF00 qbyte $000F0000 qbyte $000F0000 qbyte $00000000 s_Comma: qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $0000FF00 qbyte $0000F000 s_Minus: qbyte $00000000 qbyte $00000000 qbyte $0FFFFF00 qbyte $00000000 qbyte $00000000 qbyte $00000000 s_Period: qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $0000FF00 qbyte $0000FF00 s_Slash: qbyte $000000F0 qbyte $00000F00 qbyte $0000F000 qbyte $000F0000 qbyte $00F00000 qbyte $0F000000 s_N0: qbyte $00FFFF00 qbyte $0F000FF0 qbyte $0F00F0F0 qbyte $0F0F00F0 qbyte $0FF000F0 qbyte $00FFFF00 s_N1: qbyte $000F0000 qbyte $00FF0000 qbyte $000F0000 qbyte $000F0000 qbyte $000F0000 qbyte $00FFF000 s_N2: qbyte $00FFFF00 qbyte $0F0000F0 qbyte $00000F00 qbyte $000FF000 qbyte $00F00000 qbyte $0FFFFFF0 s_N3: qbyte $00FFFF00 qbyte $000000F0 qbyte $000FFF00 qbyte $000000F0 qbyte $000000F0 qbyte $00FFFF00 s_N4: qbyte $0000FF00 qbyte $000F0F00 qbyte $00F00F00 qbyte $0FFFFFF0 qbyte $00000F00 qbyte $00000F00 s_N5: qbyte $0FFFFFF0 qbyte $0F000000 qbyte $0FFFFF00 qbyte $000000F0 qbyte $0F0000F0 qbyte $00FFFF00 s_N6: qbyte $000FFF00 qbyte $00F00000 qbyte $0F000000 qbyte $0FFFFF00 qbyte $0F0000F0 qbyte $00FFFFF0 s_N7: qbyte $0FFFFFF0 qbyte $000000F0 qbyte $00000F00 qbyte $0000F000 qbyte $000F0000 qbyte $000F0000 s_N8: qbyte $00FFFF00 qbyte $0F0000F0 qbyte $00FFFF00 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $00FFFF00 s_N9: qbyte $00FFFF00 qbyte $0F0000F0 qbyte $00FFFF00 qbyte $0000F000 qbyte $000F0000 qbyte $00F00000 s_Colon: qbyte $000FF000 qbyte $000FF000 qbyte $00000000 qbyte $000FF000 qbyte $000FF000 qbyte $00000000 s_Semi: qbyte $00000000 qbyte $000FF000 qbyte $000FF000 qbyte $00000000 qbyte $000FF000 qbyte $000F0000 s_LAngle: qbyte $0000F000 qbyte $000F0000 qbyte $00F00000 qbyte $000F0000 qbyte $0000F000 qbyte $00000000 s_Equal: qbyte $00000000 qbyte $00000000 qbyte $0FFFFF00 qbyte $00000000 qbyte $0FFFFF00 qbyte $00000000 s_RAngle: qbyte $0000F000 qbyte $00000F00 qbyte $000000F0 qbyte $00000F00 qbyte $0000F000 qbyte $00000000 s_Question: qbyte $00FFF000 qbyte $0F000F00 qbyte $00000F00 qbyte $000FF000 qbyte $00000000 qbyte $000FF000 s_At: qbyte $00FFFF00 qbyte $0F0000F0 qbyte $0F00F0F0 qbyte $0FFFF0F0 qbyte $000000F0 qbyte $0FFFFF00 s_A: qbyte $000FF000 qbyte $00F00F00 qbyte $0F0000F0 qbyte $0FFFFFF0 qbyte $0F0000F0 qbyte $0F0000F0 s_B: qbyte $0FFFFF00 qbyte $0F0000F0 qbyte $0FFFFF00 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0FFFFF00 s_C: qbyte $00FFFFF0 qbyte $0F000000 qbyte $0F000000 qbyte $0F000000 qbyte $0F000000 qbyte $00FFFFF0 s_D: qbyte $0FFFFF00 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0FFFFF00 s_E: qbyte $0FFFFFF0 qbyte $0F000000 qbyte $0FFFF000 qbyte $0F000000 qbyte $0F000000 qbyte $0FFFFFF0 s_F: qbyte $0FFFFFF0 qbyte $0F000000 qbyte $0FFFF000 qbyte $0F000000 qbyte $0F000000 qbyte $0F000000 s_G: qbyte $00FFFFF0 qbyte $0F000000 qbyte $0F000000 qbyte $0F00FFF0 qbyte $0F0000F0 qbyte $00FFFF00 s_H: qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0FFFFFF0 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F0000F0 s_I: qbyte $0FFFFF00 qbyte $000F0000 qbyte $000F0000 qbyte $000F0000 qbyte $000F0000 qbyte $0FFFFF00 s_J: qbyte $000000F0 qbyte $000000F0 qbyte $000000F0 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $00FFFF00 s_K: qbyte $0F000F00 qbyte $0F00F000 qbyte $0FFF0000 qbyte $0F00F000 qbyte $0F000F00 qbyte $0F000F00 s_L: qbyte $0F000000 qbyte $0F000000 qbyte $0F000000 qbyte $0F000000 qbyte $0F000000 qbyte $0FFFFFF0 s_M: qbyte $0F0000F0 qbyte $0FF00FF0 qbyte $0F0FF0F0 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F0000F0 s_N: qbyte $0F0000F0 qbyte $0FF000F0 qbyte $0F0F00F0 qbyte $0F00F0F0 qbyte $0F000FF0 qbyte $0F0000F0 s_O: qbyte $00FFFF00 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $00FFFF00 s_P: qbyte $0FFFFF00 qbyte $0F0000F0 qbyte $0FFFFF00 qbyte $0F000000 qbyte $0F000000 qbyte $0F000000 s_Q: qbyte $00FFFF00 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F00F0F0 qbyte $0F000FF0 qbyte $00FFFFF0 s_R: qbyte $0FFFFF00 qbyte $0F0000F0 qbyte $0FFFFF00 qbyte $0F000F00 qbyte $0F0000F0 qbyte $0F0000F0 s_S: qbyte $00FFFFF0 qbyte $0F000000 qbyte $00FFFF00 qbyte $000000F0 qbyte $000000F0 qbyte $0FFFFF00 s_T: qbyte $0FFFFF00 qbyte $000F0000 qbyte $000F0000 qbyte $000F0000 qbyte $000F0000 qbyte $000F0000 s_U: qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $00FFFF00 s_V: qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $00F00F00 qbyte $000FF000 s_W: qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F0000F0 qbyte $0F0FF0F0 qbyte $0FF00FF0 qbyte $0F0000F0 s_X: qbyte $0F0000F0 qbyte $00F00F00 qbyte $000FF000 qbyte $000FF000 qbyte $00F00F00 qbyte $0F0000F0 s_Y: qbyte $F00000F0 qbyte $0F000F00 qbyte $00F0F000 qbyte $000F0000 qbyte $000F0000 qbyte $000F0000 s_Z: qbyte $0FFFFFF0 qbyte $00000F00 qbyte $0000F000 qbyte $000F0000 qbyte $00F00000 qbyte $0FFFFFF0 s_LBracket: qbyte $000FFF00 qbyte $000F0000 qbyte $000F0000 qbyte $000F0000 qbyte $000F0000 qbyte $000FFF00 s_BackSlash: qbyte $0F000000 qbyte $00F00000 qbyte $000F0000 qbyte $0000F000 qbyte $00000F00 qbyte $000000F0 s_RBracket: qbyte $00FFF000 qbyte $0000F000 qbyte $0000F000 qbyte $0000F000 qbyte $0000F000 qbyte $00FFF000 s_Caret: qbyte $0000F000 qbyte $000F0F00 qbyte $00F000F0 qbyte $00000000 qbyte $00000000 qbyte $00000000 s_UnderLine: qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $FFFFFFF0 s_Template: qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $00000000 qbyte $00000000