Depth and Color buffer attachemnts do not play along together

[Trajce Nikolov NICK]

Hi Community,

I am attaching to the main camera DepthBuffer and ColorBuffer as Texture2D - attached is the setup. I also have shader to check the depth buffer - so it is ok as on the image. And I am displaying it on a quad. The depth buffer is still getting me zeros when the colorbuffer is attached, otherwise when it is not, then it works as it should.

Any hints?

mOsgExternalDepth = new osg::Texture2D;

mOsgExternalDepth->setSourceFormat(GL_DEPTH_COMPONENT);

mOsgExternalDepth->setSourceType(GL_FLOAT);

mOsgExternalDepth->setInternalFormat(GL_DEPTH_COMPONENT32F);

mOsgExternalDepth->setTextureWidth(screenWidth);

mOsgExternalDepth->setTextureHeight(screenHeight);

mOsgExternalDepth->setResizeNonPowerOfTwoHint(false);\

mOsgExternalColor = new osg::Texture2D;

mOsgExternalColor->setInternalFormat(GL_RGBA16F_ARB);

mOsgExternalColor->setSourceFormat(GL_RGBA);

mOsgExternalColor->setSourceType(GL_FLOAT);

mOsgExternalColor->setTextureWidth(screenWidth);

mOsgExternalColor->setTextureHeight(screenHeight);

mOsgExternalColor->setResizeNonPowerOfTwoHint(false);

mainCamera->attach(osg::Camera::COLOR_BUFFER, (osg::Texture*)mOsgExternalColor);

mainCamera->attach(osg::Camera::DEPTH_BUFFER, (osg::Texture*)mOsgExternalDepth);

osg::ref_ptr<osg::Camera> camera = new osg::Camera;

camera->setProjectionMatrix(osg::Matrixd::ortho2D(0, screenWidth, 0, screenHeight));

camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);

camera->setViewMatrix(osg::Matrixd::identity());

camera->setClearMask(0);

camera->setRenderOrder(osg::Camera::POST_RENDER);

camera->setAllowEventFocus(false);

context.getImageGenerator()->getViewer()->getView(0)->getSceneData()->asGroup()->addChild(camera);

osg::ref_ptr<osg::Geometry> quad = osg::createTexturedQuadGeometry(osg::Vec3(0, 0, 0), osg::Vec3(screenWidth/2, 0, 0), osg::Vec3(0, screenHeight/2, 0));

quad->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);

quad->getOrCreateStateSet()->setTextureAttributeAndModes(0, mOsgExternalDepth);

const std::string vertShader = ""\

"void main() "\

"{ "\

" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; "\

" gl_TexCoord[0] = gl_TextureMatrix[0] *gl_MultiTexCoord0;"\

"}";

const std::string fragShader = ""\

"uniform sampler2D texture0; "\

"void main() "\

"{ "\

" float d = texture2D( texture0, gl_TexCoord[0].xy ).x; "\

" gl_FragColor = vec4(d, d, d, 1); "\

"}";

osg::ref_ptr<osg::Shader> vert = new osg::Shader(osg::Shader::VERTEX, vertShader);

osg::ref_ptr<osg::Shader> frag = new osg::Shader(osg::Shader::FRAGMENT, fragShader);

osg::ref_ptr<osg::Program> program = new osg::Program;

program->addShader(vert);

program->addShader(frag);

quad->getOrCreateStateSet()->setAttributeAndModes(program);

quad->getOrCreateStateSet()->addUniform(new osg::Uniform(osg::Uniform::SAMPLER_2D, "texture0", 0));

osg::ref_ptr<osg::Geometry> quadColor = osg::createTexturedQuadGeometry(osg::Vec3(screenWidth / 2, 0, 0), osg::Vec3(screenWidth/2 , 0, 0), osg::Vec3(0, screenHeight/2, 0));

quadColor->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);

quadColor->getOrCreateStateSet()->setTextureAttributeAndModes(0, mOsgExternalColor);

camera->addChild(quadColor);

camera->addChild(quad);

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trajce nikolov nick

[Trajce Nikolov NICK]

Attached is the minimal code that reproduce the problem

Thanks a bunch as always!

Nick

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trajce nikolov nick

[Trajce Nikolov NICK]

Nonone on this? Robert?

Thank you

Nick

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trajce nikolov nick

[Glenn Waldron]

Nick,

Pretty sure you can only attach one texture to a FRAME_BUFFER render target. And in that case, it is just copying the framebuffer to your texture after rendering it. Consider using a FRAME_BUFFER_OBJECT instead.

[Trajce Nikolov NICK]

Thanks Glenn. How this will work with setting the render target implementation to the main view camera? I am trying to avoid multiple cameras and I am not sure this is doable 

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[Trajce Nikolov NICK]

Actually it worked after rethinking it. Thanks Glenn