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WhatLinksHere » arrays » Sun » CppStdioH » The GPRMC Sentence » QbasicFAQ_Mouse » scripting » CppCodeSnippets » Bill Gates » Programmer » QbasicFAQ_Double buffer

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It is not possible to use double-buffred graphics for all screenmodes. The best resolution to use is SCREEN 9 (640x350).

Here a skeleton program that uses double-buffers and also  ?video synch:

  ' * Buffer indexes: *
  Frontbuffer% = 0
  Backbuffer% = 1
  ' * Main-loop: (until [Escape] is pressed) *
  WHILE INKEY$ <> CHR$(&H1B)
    ' * Swap buffers: *
    SWAP Frontbuffer%, Backbuffer%
    SCREEN 9, , Frontbuffer%, Backbuffer%
    ' * Wait for video synch: *
    DO WHILE (INP(&H3DA) AND 8) = 0
    LOOP
    DO WHILE (INP(&H3DA) AND 8)
    LOOP
    ' * Clear old screen-buffer: *
    LINE (0, 0)-(639, 349), 0, BF
    ' ********************************************
    ' Do your realtime graphic animations here =)
    ' ********************************************
  WEND ' * End of mainloop *

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