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eglCopyBuffers() issue.

Gaetano Montalti
Note: This was originally posted on 4th June 2012 at http://forums.arm.com

[font=arial][size=2]Hi,[/size][/font][font=arial][size=2]In my project I am using egl library to plot a 3D object to the display and concurrently saving the image in a file or an area of memory.[/size][/font][font=arial][size=2]I'm trying to use eglCopyBuffers()  to copy a surface to a pixmap  in order to obtain the pixel value that are displayed. I'm using an ARM MALI architecture and I would not want to use X11 but writing directly to GNU/Linux framebuffer.[/size][/font][font=arial][size=2]I have few questions:[/size][/font][font=arial][size=2]
[/size][/font][font=arial][size=2]1)In my method, I pass to eglCopyBuffers function,  as 'native_pixmap' parameter, an 'EGLNativePixmapType native_pixmap= NULL'. Is it correct? How should I declare the pixmap if I do not want to use X11 libraries?[/size][/font][font=arial][size=2]In addition, if I do as above, eglCopyBuffers returns an EGL_FALSE error, which means that the swapping of the surface buffers fails. [/size][/font][font=arial][size=2]
[/size][/font][font=arial][size=2]2) Is there another simpler method to obtain the image displayed in framebuffer? Should I directly read data from /dev/fb0? I read about the method glReadPixel but it is described as being slow and X11 dependent.[/size][/font][font=arial][size=2]
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[/size][/font][font=arial][size=2]Thank you in advance for your advice.[/size][/font][font=arial][size=2]
[/size][/font][font=arial][size=2]Kind Regards,[/size][/font][font=arial][size=2]Gaetano[/size][/font]
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