Hi,
Here is a test. It loads the image but I can't get either the mainCamera color
buffer (gTexture) to render on the quad or the
OpenSceneGraph-Data\Images\forestRoof.png.
Ideally, what I wanted is for mainCamera to not(!) draw on the screen, only
inside of gTexture. However, in other tests setting the rendertargetimp. to FBO
will produce black everything.
Code:
#include "stdafx.h"
#include <osgViewer/Viewer> // includes a lot of things for us
#include <osg/Texture2D>
#include <osgDB/ReadFile>
#include <osg/Material>
osg::ref_ptr<osg::GraphicsContext> gGc;
osgViewer::Viewer* gViewer;
osg::Camera* gCamera;
osg::Texture* gTexture;
osg::Camera* gOrtho;
osg::ref_ptr<osg::Geode> gQuad;
osg::Group* gRoot;
void funcSlave() {
osg::Texture2D* texture2D = new osg::Texture2D;
texture2D->setTextureSize(1024, 1024);
texture2D->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
texture2D->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
gTexture = texture2D;
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new
osg::GraphicsContext::Traits;
traits->x = 300;
traits->y = 100;
traits->width = 1024;
traits->height = 768;
traits->windowDecoration = true;
traits->doubleBuffer = true;
traits->sharedContext = 0;
traits->samples = 4; // MSAA
traits->vsync = false;
gGc = osg::GraphicsContext::createGraphicsContext( traits.get() );
gGc->getState()->setUseModelViewAndProjectionUniforms( true );
gGc->getState()->setUseVertexAttributeAliasing( true );
GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT;
osg::Camera* camera = gViewer->getCamera(); // alternatively: new
osg::Camera( viewer->getCamera() );
camera->setName( "Main" );
camera->setGraphicsContext( gGc.get() );
camera->setClearColor( osg::Vec4f(1, 0, 0, 1) );
camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
camera->setViewport( new osg::Viewport(0, 0, traits->width,
traits->height) );
camera->setDrawBuffer( buffer );
camera->setReadBuffer( buffer );
camera->setRenderOrder( osg::Camera::RenderOrder::PRE_RENDER );
//camera->setRenderTargetImplementation(
osg::Camera::FRAME_BUFFER_OBJECT );
camera->attach( osg::Camera::COLOR_BUFFER, gTexture );
gCamera = camera;
}
void funcOrtho() {
int Width = 512, Height = 512;
osg::Camera* ortho = gOrtho = new osg::Camera;
ortho->setName( "Ortho" );
ortho->setGraphicsContext( gGc.get() );
ortho->setClearColor( osg::Vec4f(1,0,1,1) );
ortho->setClearMask( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
ortho->setProjectionMatrix(osg::Matrix::ortho2D(0, Width, 0, Height));
//ortho->setProjectionMatrix(osg::Matrix::ortho2D(0,1,0,1));
ortho->setReferenceFrame( osg::Transform::ABSOLUTE_RF );
ortho->setViewMatrix( osg::Matrix::identity() );
ortho->setRenderOrder( osg::Camera::POST_RENDER );
ortho->setViewport(0, 0, Width, Height);
auto qaud = osg::createTexturedQuadGeometry(osg::Vec3(),
osg::Vec3(Width, 0.0, 0.0), osg::Vec3(0.0, Height, 0.0));
auto quad = gQuad = new osg::Geode;
quad->addDrawable( qaud );
auto image = osgDB::readImageFile("Images/forestRoof.png");
if (!image)
OSG_NOTICE<<"no image";
auto texture = new osg::Texture2D( image );
quad->getOrCreateStateSet()->setTextureAttributeAndModes( 0, texture );
osg::ref_ptr<osg::Material> m = new osg::Material;
m->setColorMode(osg::Material::DIFFUSE);
m->setAmbient(osg::Material::FRONT_AND_BACK, osg::Vec4(1, 1, 1, 1));
quad->getOrCreateStateSet()->setAttributeAndModes( m.get(),
osg::StateAttribute::ON);
// Can't get it to brighten up...
ortho->addChild( quad );
gViewer->addSlave(ortho, osg::Matrix(), osg::Matrix(), false);
// ortho->setPreDrawCallback( new Postprocesser( texture ) );
}
int main(int argc, char **argv) {
gViewer = new osgViewer::Viewer;
gRoot = new osg::Group;
funcSlave();
osg::ref_ptr<osg::Node> cessna = osgDB::readRefNodeFile("cessna.osgt");
if (!cessna) {
OSG_NOTICE<<"Cannot not find model 'cessna.osg' to render"<<std::endl;
return 404;
}
gRoot->addChild( cessna.get() );
funcOrtho();
//gViewer->getLight()->setLightNum(0);
//gViewer->setLightingMode(osgViewer::View::LightingMode::NO_LIGHT);
gViewer->setSceneData( gRoot );
//gRoot->getOrCreateStateSet()->setMode(GL_LIGHTING, false);
gViewer->realize();
gViewer->run();
};
Thank you!
Cheers,
Johny
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=70253#70253
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