What is the most efficient way to map four camera captures to screen using opengl es?

[leima]

Platform: imx6q, opengl es.

I am planning to map four camera captures with some transforms to the area like this:

This needs four textures for fragment shader.

I know how to use  glTexDirectVIV  to get one work, so is there any efficient way for four?

[b36401]

You can use videomixer option of gstreamer to merge such 4 videos.

Have a great day,
Victor

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[leima]

Thanks!

However there will be fisheye-calibration and projection transforms during mapping, so videomixer plugin will not meet this condition.