Hi,
does anyone know if it is possible to setup a pipeline such that I may turn on
and turn off a blurring effect during runtime?
For example:
camera->setViewport(new osg::Viewport(0,0,windowWidth,windowHeight));
camera->attach(osg::Camera::COLOR_BUFFER0, textureView);
camera->setRenderTargetImplementation(renderImplementation);
// setup osgPPU pipeline processor, which will use the main camera
osg::ref_ptr<osgPPU::Processor> processor = new osgPPU::Processor();
p_ppuProcessor = processor;
processor->setCamera(camera);
// setup unit which will bring the output of the MAIN camera,
// w/in the Processor unit into the pipeline
osgPPU::UnitCameraAttachmentBypass* ucaByPass = new
osgPPU::UnitCameraAttachmentBypass();
ucaByPass->setBufferComponent(osg::Camera::COLOR_BUFFER0);
ucaByPass->setName("mainCamOutputTexUCAB");
processor->addChild(ucaByPass);
// bypass With Blurring
//
osgPPU::UnitBypass* bypassWithBlurring = new osgPPU::UnitBypass();
bypassWithBlurring->setName("BypassWBlurring");
ucaByPass->addChild(bypassWithBlurring);
// bypass withOUT blurring
osgPPU::UnitBypass* bypassWOBlurring = new osgPPU::UnitBypass();
bypassWOBlurring->setName("BypassWOBlurring");
ucaByPass->addChild(bypassWOBlurring);
....
blurring ppu code...
....
osgPPU::UnitOut* unitOut2= new osgPPU::UnitOut();
osgPPU::ShaderAttribute* shaderAttribute= new osgPPU::ShaderAttribute();
{
osg::Shader* shader= new osg::Shader(osg::Shader::FRAGMENT);
const char* shaderSource=
"uniform sampler2D textureNameInShader;\n"
"void main()\n"
"{\n"
" gl_FragColor=texture2D(textureNameInShader,gl_TexCoord[0].st);\n"
"}";
shader->setShaderSource(shaderSource);
shaderAttribute->addShader(shader);
shaderAttribute->setName("nomShaderAttribute");
shaderAttribute->add("textureNameInShader", osg::Uniform::SAMPLER_2D);
shaderAttribute->set("textureNameInShader", 0);
unitOut2->setName("finalOutputUnit");
unitOut2->setViewport(new osg::Viewport(0,0, windowWidth, windowHeight) );
unitOut2->getOrCreateStateSet()->setAttributeAndModes(shaderAttribute);
}
//exp 1 for blurring whole scene;
bypassWithBlurring->addChild(blurx);
blurx->addChild(blury);
blury->addChild(unitOut2);
bypassWOBlurring->addChild(unitOut2);
How may I turn on and off my blur effect during runtime? I have tried using
setActive but unfortunately, it only appears to work - within my pipeline -
when applied to the last ppu, blury, and I get a black screen. Using
removeChild() in any situation causes a runtime crash.
I am not sure if removing a unit from processor is the right path to go either,
because my units are children of other units and that would force me to
re-construct my whole pipeline dynamically during runtime. I can do that but
it is more work.
Any help would be appreciated.
Thank you!
Cheers,
Allen
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=26595#26595
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