reference/shaders/comp/image.comp

#version 310 es
layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;

layout(binding = 0, rgba8) uniform readonly mediump image2D uImageIn;
layout(binding = 1, rgba8) uniform writeonly mediump image2D uImageOut;

void main()
{
    vec4 v = imageLoad(uImageIn, ivec2(gl_GlobalInvocationID.xy) + imageSize(uImageIn));
    imageStore(uImageOut, ivec2(gl_GlobalInvocationID.xy), v);
}