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

Question asked by Lei Ma on Jun 1, 2017
Latest reply on Jun 1, 2017 by Lei Ma

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?