Hello Carsten,

On 20.11.2015 18:48, Carsten Neumann wrote:
> On 2015-11-19 09:50, Johannes Brunen wrote:

>> 2.) For experimentation I did put some clear buffer code into the
>> FBOBackground clear function. I have provided a modified FBOBackground
>> along with the new stuff in the attached zip file. In this source you
>> can activate the buffer clearing with define DEBUG_CLEAR_BACKGROUND.
>
> I assume that is meant purely for debugging purposes? I may well be
> missing something but outside of debugging I don't see a reason to clear
> the buffers we are about to overwrite with the blit?
>
yes, only for debugging.

> I'll check places where glBlitFramebuffer is used, since those seem the
> most likely to have a problem.
thank you.

>
> I think the blit in FBOForeground should use the pEnv viewport
> dimensions as source (pEnv->getPixelLeft(), ..., pEnv->getPixelRight()
> +1, ...) and the entire FBO as destination (0,0, fbo->width, fbo->height).
> I'm holding off adding the FBOForeground and example so we can come to
> an agreement what values are best here.
>
ok.

>> For instance, I'm still unsure about the
>> implications of an multsampling render GL context of the window.
>
> I'm not sure what you are asking. To the extend that I understand it
> glBlitFramebuffer is capable of blitting between multisampled and
> single-sampled buffers (at the very least in the direction of multi ->
> single).
You gave me just a new piece of information with you answer. My scenario 
is that I might have a multisampled render context window and a non 
multisampled framebuffer object. I was unsure whether I did have also to 
use a multsampling framebuffer object when I have such a render context.

> So my hope would be that things "just work" ...
That would be best :-)

Greetings,
Johannes




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