[OpenSCAD] Status OpenSCAD development

[Marius Kintel]

Hi again,

I did some refactoring of the offscreen code to make it more visible what is OS specific and not:
https://github.com/openscad/openscad/tree/visitortests

In the end, these are basically the lines of code which needs porting from Mac OS X to X11/GLX - that should be doable without SDL:

  NSOpenGLPixelFormatAttribute attributes[] = {
    NSOpenGLPFAPixelBuffer,
    NSOpenGLPFANoRecovery,
    NSOpenGLPFAAccelerated,
    NSOpenGLPFADepthSize, 24,
    (NSOpenGLPixelFormatAttribute) 0
  };
  NSOpenGLPixelFormat *pixFormat = [[[NSOpenGLPixelFormat alloc] initWithAttributes:attributes] autorelease];

  ctx->openGLContext = [[NSOpenGLContext alloc] initWithFormat:pixFormat shareContext:nil];

  [ctx->openGLContext makeCurrentContext];

 -Marius