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<dv_>
the vivante gpus are primarily bandwidth limited, right? so, if an RGB -> NV12 conversion is to be done with shaders, then it is considerably faster to use multiple FBO color attachments as drawbuffers and output Y/U/V with gl_FragData[] in the fragment shader instead of 2 passes (one for Y, one for UV), right?
<dv_>
assuming that both input and output are eglimages
<cphealy>
dv: Which Vivante GPU are you referring to? IIRC, some of the newer Vivante GPUs support YUV as a render target, unlike the GC2000 in the i.MX6q.
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