Hello,
I have two questions:
1. If my main window was created using for example
4x multisampling (WGL_SAMPLES_ARB == 4), will my FBO’s
renderbuffers also be multisampled (automatically)?
First I thought “no, I have to use this glRenderbufferStorageMultisampleEXT function with the
same sample count as my main window”.
But then I read this forum post where the author writes:
FBO (not using glRenderbufferStorageMultisampleEXT) = 292 FPS
FBO (using glRenderbufferStorageMultisampleEXT with 1 sample) = 230 FPS
FBO + Multisampling 4x = 195 FPS
The last setup with 195 FPS includes Multisampling but
no glRenderbufferStorageMultisampleEXT? This would imply
multisampling could be done without the special function.
2. I have never used non power of two textures yet.
Everytime I rendered my scene to an offscreen
location (pBuffer) I modified the projection matrix
to get the same aspect ratio in the power-of-two texture.
But now since I try to use more modern stuff like the FBO
I think about getting rid of this hacky stuff with the
projection matrix and so on and instead use
GL_ARB_texture_non_power_of_two.
Then I can just allocate an FBO with the same dimensions
as my main window, right? This sounds really cool to me,
but my question is… I read that many people had trouble
with hardware not supporting this and so on.
What is the current state in that discussion?
It this extension “safe” today or do I miss
half of the graphic cards currently in use?
Your thoughts are really appreciated 
Thanks!