Strange issue with RenderTexture - "floating pixels"

cocos2d-x C++
#1

Hi there,

In my game I am implementing fullscreen shader. Shortly, I render scene to RenderTexture and then apply shader to this texture. Seems to work really nice, but…

The thing is that without rendering anything to the texture the screen is very “sharp”, which is perfect and looks really good.

When I render scene to texture (even without adding any shader) the result is that I see “floating pixels” or “moving pixels”.

The scene I render is moving/animated all the time and I use “visit” every frame.

I have to admit that I didn’t noticed it before (I focused on other stuff).

Any idea for the root cause?

Thanks,
kds

#2

I made some test (please watch the video). In the bottom left corner I am rendering screen to RenderTexture. No shader added. As you can see pixels are “floating” :confused:

Any hint?

#3

I have checked FrameBuffer and I get the same result. Any idea what am I doing wrong? Where to look?