bool SplatRenderer::beginVisibilityPass()
{
if (!mIsInitialized)
{
init();
}
if (!isSupported())
{
std::cerr << "SplatRenderer error: not supported hardware\n";
return false;
}
if (mCurrentPass!=2)
{
std::cerr << "SplatRenderer error: programming error when calling beginVisibilityPass\n";
return false;
}
viewer->glPushAttrib(GL_ALL_ATTRIB_BITS);
mCurrentPass = 0;
// grab projection info
viewer->glGetIntegerv(GL_VIEWPORT, mCachedVP);
viewer->glGetFloatv(GL_MODELVIEW_MATRIX, mCachedMV);
viewer->glGetFloatv(GL_PROJECTION_MATRIX, mCachedProj);
updateRenderBuffer();
if (mCachedFlags != mFlags)
configureShaders();
// configureShaders may detect that shaders are actually not supported.
if (!isSupported())
{
std::cerr << "SplatRenderer error: not supported hardware\n";
return false;
}
mCachedFlags = mFlags;
mParams.update(mCachedMV, mCachedProj, mCachedVP);
mParams.loadTo(mShaders[mCurrentPass]);
mRenderBuffer->bind();
if (mFlags & DEFERRED_SHADING_BIT)
{
//GLenum buf[2] = {GL_COLOR_ATTACHMENT0_EXT,GL_COLOR_ATTACHMENT1_EXT};
GLenum buf[2] = {GL_COLOR_ATTACHMENT0,GL_COLOR_ATTACHMENT1};
//glDrawBuffersARB(2, buf);
viewer->glDrawBuffers(2, buf);
}
viewer->glViewport(mCachedVP[0],mCachedVP[1],mCachedVP[2],mCachedVP[3]);
viewer->glClearColor(0,0,0,0);
viewer->glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
enablePass(mCurrentPass);
;
return true;
}
int main(int argc, char **argv)
{
osg::ArgumentParser arguments(&argc, argv);
osg::Node *root = osgDB::readNodeFiles(arguments);
if (root == NULL)
{
osg::notify(osg::FATAL) << "Unable to load model from command line." << std::endl;
return(1);
}
configureShaders(root->getOrCreateStateSet());
const int width(800), height(450);
const std::string version("3.1");
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits();
traits->x = 20; traits->y = 30;
traits->width = width; traits->height = height;
traits->windowDecoration = true;
traits->doubleBuffer = true;
traits->glContextVersion = version;
osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
if (!gc.valid())
{
osg::notify(osg::FATAL) << "Unable to create OpenGL v" << version << " context." << std::endl;
return(1);
}
osgViewer::Viewer viewer;
// Create a Camera that uses the above OpenGL context.
osg::Camera *cam = viewer.getCamera();
cam->setGraphicsContext(gc.get());
// Must set perspective projection for fovy and aspect.
cam->setProjectionMatrix(osg::Matrix::perspective(30., (double)width / (double)height, 1., 100.));
// Unlike OpenGL, OSG viewport does *not* default to window dimensions.
cam->setViewport(new osg::Viewport(0, 0, width, height));
viewer.setSceneData(root);
// for non GL3/GL4 and non GLES2 platforms we need enable the osg_ uniforms that the shaders will use,
// you don't need thse two lines on GL3/GL4 and GLES2 specific builds as these will be enable by default.
gc->getState()->setUseModelViewAndProjectionUniforms(true);
gc->getState()->setUseVertexAttributeAliasing(true);
return(viewer.run());
}
