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glReadPixels

Sebastien (OBSOLETE) Baudouin
Note: This was originally posted on 9th March 2012 at http://forums.arm.com

Hi all,

i try to render scene in an off screen  way, controlling the location of my pixels (the pointer is fixed by myself).
It seems that MALI400 is not supporting eglCreatePixmapSurface, interface that would allows me to create a  surface that will use pixels in the location i want.

As it is not working i have to use the API glReadPixels which is very very slow (compare to other GPU).

So i'm wondering if there is a reason for such bad perf for ReadPixels and if someone knows a way with MALI to render a scene at place (pixel buffer address) you want.

Thanks for your help.

BR

Seb
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  • Note: This was originally posted on 13th June 2012 at http://forums.arm.com

    Hi all,
    When i try above code, i am failed.
    At firstly, i  make one GLSurfaceView and set one render to it in Java. In onDrawFrame function of render, i want to rende data by opengl which format is NV12 in one graphicbuffer.
    I use eglCreateImageKHR to get EGLImageKHR variable img from graphicbuffer, then i use glEGLImageTargetTexture2DOES to binde. And i try above code also. At last, there is only green in rendering.
    I doubt EGL initlization is need to do by some code. Does any know how to fix the problem?

    thx,
    guangx
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  • Note: This was originally posted on 13th June 2012 at http://forums.arm.com

    Hi all,
    When i try above code, i am failed.
    At firstly, i  make one GLSurfaceView and set one render to it in Java. In onDrawFrame function of render, i want to rende data by opengl which format is NV12 in one graphicbuffer.
    I use eglCreateImageKHR to get EGLImageKHR variable img from graphicbuffer, then i use glEGLImageTargetTexture2DOES to binde. And i try above code also. At last, there is only green in rendering.
    I doubt EGL initlization is need to do by some code. Does any know how to fix the problem?

    thx,
    guangx
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