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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Sorry to bother you guys... but I was wondering if you can help identify why my pass through vertex shader isn't working. In essence, if I enable the vertex shader, then the scene disappears (I only see that blue background color). If I
disable it then the scene appears correctly. No errors are generated by OSG after linking the vertex shader. I know that my fragment shader is working because if I set the gl_FragColor to red then the scene is completely red.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here are my pass-thru shaders:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[code]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">VERTEX SHADER<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">=============<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">attribute vec4 osg_Vertex;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void main( void )<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> gl_Position = osg_Vertex;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">FRAGMENT SHADER<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">===============<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">uniform sampler2D tRttTexture;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void main( void )<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> vec3 vColor = texture2D( tRttTexture, gl_TexCoord[0].st ).rgb;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> // Output color.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> gl_FragColor = vec4( vColor, 1.0 );<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[/code]<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The shader is applied on a fullscreen quad using typical Ortho2D projection. Here is the code that loads the shader which is applied to the post process geode containing a single geometry quad:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[code]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void loadShaders( )<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> osg::StateSet* pStateSet = g_pPolyGeode->getOrCreateStateSet( );<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> osg::ref_ptr<osg::Program> pProgram = new osg::Program;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pProgram->setName( "PostProcessProgram" );
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> osg::ref_ptr<osg::Shader> pVertShader = osg::Shader::readShaderFile( osg::Shader::VERTEX, osgDB::findDataFile( "shaders/osgprerender.vert" ) );<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> if( pVertShader )<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pVertShader->setName( "osgprerender.vert" );<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pProgram->addShader( pVertShader );<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pProgram->addBindAttribLocation( "osg_Vertex", 0 );<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> osg::ref_ptr<osg::Shader> pFragShader = osg::Shader::readShaderFile( osg::Shader::FRAGMENT, osgDB::findDataFile( "shaders/osgprerender.frag" ) );<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> if( pFragShader )<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pFragShader->setName( "osgprerender.frag" );<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pProgram->addShader( pFragShader );<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> // RTT texture.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pStateSet->addUniform( new osg::Uniform( "tRttTexture", 0 ) );<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pStateSet->setAttributeAndModes( pProgram, osg::StateAttribute::ON );<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[/code]<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What am I doing wrong? I tried different variation of the shader but nothing works. Here are the variations that I tried:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[code]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">VARIATION #1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">===========<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void main( void )<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> gl_Position = gl_Vertex;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">VARIATION #2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">===========<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void main( void )<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">VARIATION #3<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">===========<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">attribute vec4 osg_Vertex;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void main( void )<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> gl_Position = gl_ModelViewProjectionMatrix * osg_Vertex;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">VARIATION #4<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">===========<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void main( void )<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> gl_Position = ftransform();<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[/code]<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any help would be really appreciated... The full source code is attached.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Cheers,<o:p></o:p></p>
<p class="MsoNormal">Guy<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:EN-CA">Guy Volckaert</span></b><b><span style="color:#1F497D;mso-fareast-language:EN-CA">, ing.</span></b><span style="color:#1F497D;mso-fareast-language:EN-CA"><br>
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