[Bug 99247] glReadPixels on Intel N3700 (Braswell) slower than Raspberry Pi

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99247

--- Comment #2 from Pierre Proske <pierre at digitalstar.net> ---
The code I'm using is this, I'm pretty sure the format is RGB 888 which I'm
guessing is slow. However on Windows it's running the exact same code.

void ofFbo::readToPixels(ofPixels & pixels, int attachmentPoint) const{
        if(!bIsAllocated) return;
#ifndef TARGET_OPENGLES
        getTexture(attachmentPoint).readToPixels(pixels);
#else
       
pixels.allocate(settings.width,settings.height,ofGetImageTypeFromGLType(settings.internalformat));
        bind();
        int format = ofGetGLFormatFromInternal(settings.internalformat);
        glReadPixels(0,0,settings.width, settings.height, format,
GL_UNSIGNED_BYTE, pixels.getData());
        unbind();
#endif
}

I'm using the OpenFrameworks Library, grabbing pixels from an FBO:
https://github.com/openframeworks/openFrameworks/blob/0.9.8/libs/openFrameworks/gl/ofFbo.cpp

I'll have a look a getting an API trace uploaded. This is the tool right?
https://github.com/apitrace/apitrace

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