Hello Christoph,
On 06/29/2012 08:01 AM, "Christoph Fünfzig" wrote:
> I would like to render a depth image via FBO with a
> current OpenSG 2.0.
> Quite a common operation, so can someone post a code fragment for it perhaps?
the TrapezoidalShadowMapEngine (in Contrib/TrapezoidalShadowMaps) does this:
TSMEngineData *data;
TextureObjChunk *bufTex = data->getShadowTexChunk();
if(bufTex == NULL)
{
TextureObjChunkUnrecPtr newBufTex = TextureObjChunk::createLocal();
newBufTex->setMinFilter (GL_LINEAR );
newBufTex->setMagFilter (GL_LINEAR );
newBufTex->setWrapS (GL_CLAMP_TO_EDGE );
newBufTex->setWrapT (GL_CLAMP_TO_EDGE );
newBufTex->setWrapR (GL_CLAMP_TO_EDGE );
newBufTex->setScale (false );
newBufTex->setInternalFormat(GL_DEPTH_COMPONENT24 );
newBufTex->setExternalFormat(GL_DEPTH_COMPONENT );
newBufTex->setCompareMode (GL_COMPARE_R_TO_TEXTURE);
newBufTex->setCompareFunc (GL_LESS );
newBufTex->setDepthMode (GL_LUMINANCE );
data->setShadowTexChunk(newBufTex);
this->setShadowTexChunk(newBufTex);
}
Image *bufImg = data->getShadowTexImage();
if(bufImg == NULL)
{
ImageUnrecPtr newBufImg = Image::createLocal();
newBufImg->set(Image::OSG_L_PF,
this->getWidth (),
this->getHeight(),
1,
1,
1,
0.,
NULL,
Image::OSG_UINT8_IMAGEDATA,
false,
1);
bufTex->setImage (newBufImg);
data ->setShadowTexImage(newBufImg);
bufImg = newBufImg;
}
TextureObjChunk *bufTex = data->getShadowTexChunk();
if(data->getMFShadowTexBuffers()->empty() == true)
{
TextureBufferUnrecPtr newBuf = TextureBuffer::createLocal();
newBuf->setTexture (bufTex );
newBuf->setTexTarget(GL_TEXTURE_2D);
data->editMFShadowTexBuffers()->push_back(newBuf);
}
if(data->getMFRenderTargets()->empty() == true)
{
FrameBufferObjectUnrecPtr newTarget =
FrameBufferObject::createLocal();
newTarget->setWidth (this->getWidth ( ));
newTarget->setHeight (this->getHeight ( ));
newTarget->setDepthAttachment(data->getShadowTexBuffers(0));
data->editMFRenderTargets()->push_back(newTarget);
}
Please note that here the texture is not copied back to main memory (for
that you need to enable readback and post processing on the
TextureBuffer and FBO respectively - as your code does).
Hope it helps,
Carsten
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