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From the link below, we know that we can force highp in shaders(opengl)We'd like to know how to force highp in shaders, whether it is compiler option with a certain parameter or other ways
developer.arm.com/.../Forcing-highp-in-shaders
There is no automatic way to do this - you just have to replace "lowp" and "mediump" string tokens with "highp" in the shader source code before passing them to the driver.
HTH, Pete