Another problem with VGA_Demo.spin
Rayman
Posts: 14,793
I just got tripped up by another problem with the library example file "VGA_Demo.spin"...
I already found the error in the clear screen routine that should fill with $220 instead of $200...
Just found out that if you try to write a character to the last row, you will overflow the screen buffer...· This is because the Print(c) routine does not check to make sure it isn't on the last row before writing the bottom half of a character.
I would recommend these changes to anybody using this:
I already found the error in the clear screen routine that should fill with $220 instead of $200...
Just found out that if you try to write a character to the last row, you will overflow the screen buffer...· This is because the Print(c) routine does not check to make sure it isn't on the last row before writing the bottom half of a character.
I would recommend these changes to anybody using this:
case c
$00..$FF: 'character?
k := color << 1 + c & 1
i := k << 10 + $200 + c & $FE
screen[noparse][[/noparse]row * cols + col] := i
if (row+1)<rows
screen[noparse][[/noparse](row + 1) * cols + col] := i | 1
if ++col == cols
newline
$100: 'clear screen?
wordfill(@screen, $220, screensize)
col := row := 0