Accessing texture data from the application side on Android

rgngl — Tue, 13 Oct 2015 08:39:40 GMT

Hi,

Currently I create a GraphicsBuffer object, create an EGLImage and bind that EGLImage to a texture and use it as a render target. After that, I can access the underlying graphics buffer data from the application. This works fine in every other device with different GPUs but not on a Huawei device with an Immersion.16 GPU. There's no error generated anywhere, but the buffer from the GraphicsBuffer object I created is just filled with zeroes only. The same problem is also mentioned in this thread too, without any workaround/solution: Is Android direct texture supported on imx6q?

I also found about glTexDirectVIV and glTexDirectVIVMap methods but apparently they only support writing to a texture buffer, not reading from it. Is there a known working way of accessing texture data on Vivante GPUs? Any help is appreciated.

Thanks in advance

Re: Accessing texture data from the application side on Android

Bio_TICFSL — Mon, 19 Oct 2015 16:29:36 GMT

Hi Ustun,

Similar behaviours with proper solution and code are in i.MX6: camera image processing with 16 bit per color channel (IPU->GPU->VPU) under Linux

Just from the top of my head I guess that If you like to get texture data after render to texture I recommend to use glReadPixels instead OpeGLES functions, once you had the buffer you can use glMapBudder to get the data.

Hope this helps

i.MX Processors中的主题 Accessing texture data from the application side on Android

Accessing texture data from the application side on Android

Re: Accessing texture data from the application side on Android