io
about
blog
community
docs
downloads

    2008 02 27         Screenshot

    Some sample code for taking a screenshot in an OpenGL app:

    First, let us add a Image method to help: 

      Image grabScreen := method(
     data := Sequence clone 
     width  := glutGet(GLUT_WINDOW_WIDTH)
     height := glutGet(GLUT_WINDOW_HEIGHT)
     glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data)	
     self setDataWidthHeightComponentCount(data, width, height, 4)
     self flipY
  )
    Now we can use it (within a running GL application): 
    Image clone grabScreen save("screenshot.jpg")