//--------------------------------------------------------------------------
void UnitInMipmapOut::createAndAttachFBOs(osg::Texture* output, int mrt)
{
// check if the texture is 2D texture
if (dynamic_cast<osg::Texture2D*>(output) == NULL)
{
osg::notify(osg::WARN) << "osgPPU::UnitInMipmapOut::createAndAttachFBOs() - currently only 2D textures are supported" << std::endl;
return;
}
// check if we have generated all the fbo's for each mipmap level
int width = output->getTextureWidth();
int height = output->getTextureHeight();
int mwh = std::max(width, height);
int numLevel = 1 + static_cast<int>(floor(logf(mwh)/logf(2.0f)));
// set new sizes
mOutputWidth = width;
mOutputHeight = height;
mNumLevels = numLevel;
// if we do not use shader, then return
if (mUseShader == false) return;
// generate fbo and viewport for each mipmap level if not done before
if ((int)mMipmapFBO.size() != numLevel)
{
// generate mipmap levels
mMipmapFBO.clear();
mMipmapViewport.clear();
mMipmapDrawable.clear();
for (int i=0; i < numLevel; i++)
{
// generate viewport for the mipmap level
osg::ref_ptr<osg::Viewport> vp = new osg::Viewport();
int w = std::max(1, (int)floor(float(width) / float(pow(2.0f, (float)i)) ));
int h = std::max(1, (int)floor(float(height) / float(pow(2.0f, (float)i)) ));
vp->setViewport(0,0, (osg::Viewport::value_type)w, (osg::Viewport::value_type)h);
mMipmapViewport.push_back(vp);
// generate fbo and assign a mipmap level to it
osg::ref_ptr<FrameBufferObject> fbo = new FrameBufferObject();
fbo->setAttachment(osg::Camera::BufferComponent(osg::Camera::COLOR_BUFFER0 + mrt), osg::FrameBufferAttachment(dynamic_cast<osg::Texture2D*>(output), i));
mMipmapFBO.push_back(fbo);
// generate drawable which is responsible for this level
osg::Drawable* draw = createTexturedQuadDrawable();
osg::StateSet* ss = draw->getOrCreateStateSet();
ss->setAttribute(vp, osg::StateAttribute::ON);
//ss->setAttribute(fbo, osg::StateAttribute::ON);
mMipmapDrawable.push_back(draw);
}
}
}
//------------------------------------------------------------------------------
void UnitMipmapInMipmapOut::checkIOMipmappedData()
{
if (mOutputTex.size() > 0)
{
// do only proceed if output texture is valid
if (mOutputTex.begin()->second == NULL) return;
// clean viewport data
mIOMipmapViewport.clear();
mIOMipmapFBO.clear();
mIOMipmapDrawable.clear();
// get dimensions of the output data
int width = (mOutputTex.begin()->second)->getTextureWidth();
int height = (mOutputTex.begin()->second)->getTextureHeight();
int mwh = std::max(width, height);
int numLevels = 1 + static_cast<int>(floor(logf(mwh)/logf(2.0f)));
// generate fbo for each mipmap level
for (int level=0; level < numLevels; level++)
{
// generate viewport for this level
osg::ref_ptr<osg::Viewport> vp = new osg::Viewport();
int w = std::max(1, (int)floor(float(width) / float(pow(2.0f, (float)level)) ));
int h = std::max(1, (int)floor(float(height) / float(pow(2.0f, (float)level)) ));
vp->setViewport(0,0, (osg::Viewport::value_type)w, (osg::Viewport::value_type)h);
mIOMipmapViewport.push_back(vp);
// this is the fbo for this level
osg::ref_ptr<FrameBufferObject> fbo = new FrameBufferObject();
// for each output texture do
std::map<int, osg::ref_ptr<osg::Texture> >::iterator it = mOutputTex.begin();
for (int mrt = 0; it != mOutputTex.end(); it++, mrt++)
{
// output texture
osg::ref_ptr<osg::Texture2D> output = dynamic_cast<osg::Texture2D*>(it->second.get());
// check if we have generated all the fbo's for each mipmap level
int _width = output->getTextureWidth();
int _height = output->getTextureHeight();
// if width and height are not equal, then we give some error and stop here
if ((_width != width || _height != height))
{
osg::notify(osg::FATAL) << "osgPPU::UnitInOut::checkIOMipmappedData() - " << getName() << ": output textures has different dimensions" << std::endl;
return;
}
// set fbo of current level with to this output
fbo->setAttachment(osg::Camera::BufferComponent(osg::Camera::COLOR_BUFFER0 + mrt), osg::FrameBufferAttachment(output.get(), level));
}
// store fbo
mIOMipmapFBO.push_back(fbo);
// generate mipmap drawables
osg::Drawable* draw = createTexturedQuadDrawable();
osg::StateSet* ss = draw->getOrCreateStateSet();
ss->setAttribute(vp, osg::StateAttribute::ON);
//ss->setAttribute(fbo, osg::StateAttribute::ON);
mIOMipmapDrawable.push_back(draw);
}
}
}
