On 07.10.2015 14:52, Gerrit Voß wrote:
>
> For your shader problem below, ...
> The easiest way around this is to use a SimpleSHLChunk instead ...
I did not know about that one :-(
I took a look into the PassiveBackground implementation and it seems
that it is quite near to what is needed here if I understand correctly.
If ClearFrameBufferObject is set and no ClearCallback is defined it does
perform some blitting by
osgGlBindFramebuffer(GL_READ_FRAMEBUFFER_EXT, 0)
osgGlBlitFramebuffer(
pEnv->getPixelLeft (),
pEnv->getPixelBottom(),
pEnv->getPixelRight (),
pEnv->getPixelTop (),
pEnv->getPixelLeft (),
pEnv->getPixelBottom(),
pEnv->getPixelRight (),
pEnv->getPixelTop (),
(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT),
GL_NEAREST);
osgGlBindFramebuffer(
GL_READ_FRAMEBUFFER_EXT,
win->getGLObjectId(pEnv->getActiveFBO()));
Am I correct that this blit from the main render buffer into the active FBO?
Assume that we store the FBO into the FancyBackground. How do we do the
opposite blit operation?
glBindFramebuffer(GL_READ_FRAMEBUFFER, my_fbo);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glReadBuffer(GL_COLOR_ATTACHMENT0);
glDrawBuffer(GL_COLOR_ATTACHMENT0);
osgGlBlitFramebuffer(
pEnv->getPixelLeft (),
pEnv->getPixelBottom(),
pEnv->getPixelRight (),
pEnv->getPixelTop (),
pEnv->getPixelLeft (),
pEnv->getPixelBottom(),
pEnv->getPixelRight (),
pEnv->getPixelTop (),
(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT),
GL_NEAREST);
What is my_fbo actually, i.e. where do I get the id of the stored FBO?
I have no experience with GL framebuffer handling, so any hints are
welcomed.
Best,
Johannes
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