Is there a different or better way to test for anti-aliasing support than to just call osg::DisplaySettings::instance()->setNumMultiSamples() repeatedly with smaller and smaller values, which doesn't seem to work for me anyway (so hopefully the answer is yes). I tried to have it set the number of multi samples and then call realize() on the viewer and if it failed to realize I have it try a smaller value for number of samples. What ends up happening is that it starts at 8, fails, then tries 4, which I know is supported by my video card so it should work and it appears to work, but the window opens and it is just black and nothing seems to render to it. So I'm wondering if my way of checking for anti-aliasing support is wrong. Here is the debug output from my attempts to make this work:
Setting anti-aliasing samples to: 8 GraphicsContext::registerGraphicsContext 0x8e4ff20 Relaxing traits Error: Not able to create requested visual. close(1)0x8e4ff20 close(0)0x8e4ff20 GraphicsContext::unregisterGraphicsContext 0x8e4ff20 Viewer::realize() - No valid contexts found, setting up view across all screens. GraphicsContext::getWindowingSystemInterface() 0x8e4c030 0x102ee20 GraphicsContext::registerGraphicsContext 0x8e51e28 Relaxing traits Error: Not able to create requested visual. close(1)0x8e51e28 close(0)0x8e51e28 GraphicsContext::unregisterGraphicsContext 0x8e51e28 GraphicsWindow has not been created successfully. Viewer::realize() - failed to set up any windows Trying anti aliasing samples at 4 Viewer::realize() - No valid contexts found, setting up view across all screens. GraphicsContext::getWindowingSystemInterface() 0x8e4c030 0x102ee20 GraphicsContext::registerGraphicsContext 0x8e51e28 GraphicsContext::getWindowingSystemInterface() 0x8e4c030 0x102ee20 GraphicsContext::createNewContextID() creating contextID=0 Updating the MaxNumberOfGraphicsContexts to 1 GraphicsWindow has been created successfully. X window successfully opened So even though it appears that the "GraphicsWindow has been created successfully", my app is not able to render anything into the window. The funny thing is that if I start with a number of multi-samples value of 4 then everything works fine. Its only if I first test the realize() with a multi-samples value that is not supported by my card that makes subsequent valid multi-samples values not work. Any advice for how to fix this? Thanks. Alex
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