Hi Carsten,
thanks a lot, I have it working now.
Actually, read back has been the problem.
In "OSGRenderBuffer.cpp", it uses "pImg->getPixelFormat()" as the format,
(which should be GL_DEPTH_COMPONENT for the depth buffer)
"
void RenderBuffer::processPreDeactivate (DrawEnv *pEnv, UInt32 index)
{
if(_sfReadBack.getValue() == true)
{
Image *pImg = this->getImage();
if(pImg == NULL)
return;
if(pImg->getData() == NULL)
{
SINFO << "TextureBuffer::render: (Re)Allocating image "
<< "for read-back."
<< endLog;
pImg->set(pImg->getPixelFormat(),
pImg->getWidth (),
pImg->getHeight (),
pImg->getDepth (),
pImg->getMipMapCount(),
pImg->getFrameCount (),
pImg->getFrameDelay (),
NULL,
pImg->getDataType (),
true,
pImg->getSideCount () );
}
// select GL_COLORATTACHMENTn and read data into image
#ifndef OSG_OGL_ES2
glReadBuffer(index);
#endif
glReadPixels(0, 0,
pImg->getWidth (),
pImg->getHeight (),
pImg->getPixelFormat(),
pImg->getDataType (),
pImg->editData ());
#ifndef OSG_OGL_ES2
glReadBuffer(GL_NONE);
#endif
glErr("renderbuffer:predeactivate");
}
}
"
Can you please consider adding a format GL_DEPTH_COMPONENT to "OSGImage.cpp" ?
"OSGImage.cpp", line 110:
{ GL_DEPTH_COMPONENT, 1 },
With this addition, it works with RenderBuffer and TextureBuffer as well.
Best regards,
Christoph
On 29.06.2012 16:05, Carsten Neumann wrote:
> 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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