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[FYI] VGA, 40x15, single cog, per cell colour/palette, ROM font - Page 2 — Parallax Forums

[FYI] VGA, 40x15, single cog, per cell colour/palette, ROM font

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  • JRetSapDoogJRetSapDoog Posts: 954
    edited 2013-10-19 15:14
    @Marko: Great! That "saves" an additional 2K bytes. And thanks for pointing out localroger's "painless" interleaving/reversing technique!

    @localroger: Thanks for creating and sharing that great technique for keeping one's sanity in defining custom characters in a DAT section.
  • JRetSapDoogJRetSapDoog Posts: 954
    edited 2013-10-19 15:30
    So, I guess one can dispense with the font[] array in the VAR section if defining one's own font in a DAT section (someone correct me if I'm wrong).

    Marko's demo is cool, particularly the way it rotates the custom font (scroll-like). As another example, the code below is a rudimentary test that I made, which simply replaces Marko's "selftest" PUB method (and the VAR section may optionally be commented out):
    PUB selftest : c

  vga.init
  vga.str(string(vga#ESC, "s"))                         ' page mode

  vga.str(string($A,12,$B,2,"Custom Font Test"))
  vga.str(string($A,16,$B,5,"0 1 2 3"))
  vga.str(string($A,16,$B,6,"-------",$A,16,$B,7))

  repeat c from 0 to 3 'output 1st four ROM font characters
    vga.putc(c)
    vga.putc(" ")

  'non-changing chars (shows that chars>31 are constant)
  vga.str(string($A,7,$B,10,"abcdefghijklmnopqrstuvwxyz"))  
  vga.str(string($A,7,$B,11,"ABCDEFGHIJKLMNOPQRSTUVWXYZ"))

  repeat  'alternate between ROM and Custom fonts
    vga.setn(1, constant(NEGX|$8000))                   'use the ROM font for chars 0..31
    waitcnt(clkfreq*2+cnt)
    vga.setn(1, NEGX|@user_font)                        'use the custom font for chars 0..31  
    waitcnt(clkfreq*2+cnt)
  • JRetSapDoogJRetSapDoog Posts: 954
    edited 2013-10-19 15:35
    And below is some sample custom font data (for 4 characters) for a DAT section to go along with the above test code:
    As suggested by kuroneko (Marko), this custom font-definition technique (the format/math) is from localroger (Roger Williams). Thanks to both!!
    DAT

{
  *** This technique is from Roger Williams' vga_40x18_rom_demo.spin v1.1 ***
  
  The user defined chars must be reversed and interleaved like the ROM font,
  but in order to save memory they are only 16 pixels high.  This example
  shows a way to draw the font forward and un-interleaved so that the
  proptool will assemble it correctly.  Draw the left/lsb=0 character with
  2's and the right/lsb=1 character with 1's.  The reverse and add
  operations will take care of the interleave.
}

user_font   'beginning address of user's custom font data

        'Custom Font Data for Chars 0 & 1
C00_01  long  %%22222222_22222222 >< 32 + %%11100000_00000111 >< 32
        long  %%22222222_22222222 >< 32 + %%11100000_00000111 >< 32
        long  %%22222222_22222222 >< 32 + %%11100000_00000111 >< 32
        long  %%22200000_00000222 >< 32 + %%01110000_00001110 >< 32
        long  %%22200000_00000222 >< 32 + %%01110000_00001110 >< 32
        long  %%22200000_00000222 >< 32 + %%01110000_00001110 >< 32
        long  %%22200000_00000222 >< 32 + %%00111000_00011100 >< 32
        long  %%22200000_00000222 >< 32 + %%00111000_00011100 >< 32                                                      
        long  %%22200000_00000222 >< 32 + %%00111000_00011100 >< 32
        long  %%22200000_00000222 >< 32 + %%00011100_00111000 >< 32
        long  %%22200000_00000222 >< 32 + %%00011100_00111000 >< 32
        long  %%22200000_00000222 >< 32 + %%00011100_00111000 >< 32
        long  %%22200000_00000222 >< 32 + %%00001110_01110000 >< 32
        long  %%22200000_00000222 >< 32 + %%00001110_01110000 >< 32
        long  %%22200000_00000222 >< 32 + %%00001110_01110000 >< 32
        long  %%22200000_00000222 >< 32 + %%00000111_11100000 >< 32
        long  %%22200000_00000222 >< 32 + %%00000111_11100000 >< 32
        long  %%22200000_00000222 >< 32 + %%00001110_01110000 >< 32
        long  %%22200000_00000222 >< 32 + %%00001110_01110000 >< 32
        long  %%22200000_00000222 >< 32 + %%00001110_01110000 >< 32
        long  %%22200000_00000222 >< 32 + %%00011100_00111000 >< 32
        long  %%22200000_00000222 >< 32 + %%00011100_00111000 >< 32
        long  %%22200000_00000222 >< 32 + %%00011100_00111000 >< 32
        long  %%22200000_00000222 >< 32 + %%00111000_00011100 >< 32
        long  %%22200000_00000222 >< 32 + %%00111000_00011100 >< 32
        long  %%22200000_00000222 >< 32 + %%00111000_00011100 >< 32
        long  %%22200000_00000222 >< 32 + %%01110000_00001110 >< 32
        long  %%22200000_00000222 >< 32 + %%01110000_00001110 >< 32
        long  %%22200000_00000222 >< 32 + %%01110000_00001110 >< 32
        long  %%22222222_22222222 >< 32 + %%11100000_00000111 >< 32
        long  %%22222222_22222222 >< 32 + %%11100000_00000111 >< 32
        long  %%22222222_22222222 >< 32 + %%11100000_00000111 >< 32

        'Custom Font Data for Chars 2 & 3
C02_03  long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32                                                    
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
        long  %%22222200_00000000 >< 32 + %%00000000_00111111 >< 32
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