[Mesa3d-users] Fastest way to grab pixel values in to memory (and file)

[Srimal J. <sr...@gm...>]

Hi all


I'm working on a Image recognition project where I need to do
calculations on different views (more than 100 frames)
of a 3d model within an order of less than 1 sec, in order to
calculate a particular optimization function.

I am hoping to use OpenGL to obtain 2D pixel values from different 3D
view points, in the hope that the 3d h/w processing will do things a
lot faster for me.

I need to render 100frames of 20,000 triangles
in less than 1sec.

At the moment I am using glReadPixels() to read transformed pixel
values into memory.

This is a bit slow and it takes around 10sec to grab 100 frames .

Is  there a faster way? Or would you recommend a
better approach?

I've heard of buffer object ? but am not quite sure how they can
be used to grab pixel data into memory.

Rendering the pixels into some virtual buffer is fine with my application
as long as reading the pixel values happens in less than 1 sec.


Any pointers would be much appreciated.

Thanks in advance

Srimal.