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  LWJGL check for available contexts  (Read 329 times)
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Offline SHC
« Posted 2014-03-02 04:56:37 »

I want to select the best available OpenGL context for the GPU by reading the capabilities. Here is my current solution.

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public static void main(String[] args)
{
    try
    {
        Display.create();

        System.out.println("Compatibility Mode");
        checkGLCaps();

        Display.destroy();

        PixelFormat pixelFormat = new PixelFormat();
        ContextAttribs contextAtrributes = new ContextAttribs(3, 2);
        contextAtrributes.withForwardCompatible(true);
        contextAtrributes.withProfileCore(true);

        Display.create(pixelFormat, contextAtrributes);

        System.out.println("Core Mode");
        checkGLCaps();

        Display.destroy();
    }
    catch (LWJGLException e)
    {
        e.printStackTrace();
    }
}

static void checkGLCaps()
{
    System.out.println("OpenGL 1.1:  " + GLContext.getCapabilities().OpenGL11);
    System.out.println("OpenGL 1.2:  " + GLContext.getCapabilities().OpenGL12);
    System.out.println("OpenGL 1.3:  " + GLContext.getCapabilities().OpenGL13);
    System.out.println("OpenGL 1.4:  " + GLContext.getCapabilities().OpenGL14);
    System.out.println("OpenGL 1.5:  " + GLContext.getCapabilities().OpenGL15);
    System.out.println("OpenGL 2.0:  " + GLContext.getCapabilities().OpenGL20);
    System.out.println("OpenGL 2.1:  " + GLContext.getCapabilities().OpenGL21);
    System.out.println("OpenGL 3.0:  " + GLContext.getCapabilities().OpenGL30);
    System.out.println("OpenGL 3.1:  " + GLContext.getCapabilities().OpenGL31);
    System.out.println("OpenGL 3.2:  " + GLContext.getCapabilities().OpenGL32);
    System.out.println("OpenGL 3.3:  " + GLContext.getCapabilities().OpenGL33);
    System.out.println("OpenGL 4.0:  " + GLContext.getCapabilities().OpenGL40);
}

But this requires the window to be created before the capabilities are reported which results in blinking windows before launching the game. Is it possible to do this efficiently and without creating the Display?

Online Spasi
« Reply #1 - Posted 2014-03-02 16:04:22 »

The only way to do it in LWJGL 2 without a Display is to use a Pbuffer. In LWJGL 3 you're able to create invisible windows, so there isn't a need for a pbuffer context. In fact, 3 will not even provide a pbuffer API (the platform-specific pbuffer extensions will still be available though).
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