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GLSL read+write image2D

blackpawn

I expected to be able to use both imageLoad and imageStore on the same image to read and modify it from within a compute shader.

Trying with a declaration of: layout(r32f, binding=0) uniform highp image2D x;
Produces "Shader error: Image has to be qualified as 'readonly', 'writeonly' or both."

I haven't been able to find yet how to specify "both" as the error implies is possible. Is there a keyword for this I've missed?

I'm using a Mali-T720 with GLES 3.1 v1.r7p0-02