shaders-msl/comp/composite-construct.comp

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

layout(std430, binding = 0) buffer SSBO0
{
   vec4 as[];
};

layout(std430, binding = 1) buffer SSBO1
{
   vec4 bs[];
};

struct Composite
{
   vec4 a;
   vec4 b;
};

const vec4 const_values[2] = vec4[](vec4(20.0), vec4(40.0));

void main()
{
   vec4 values[2] = vec4[](as[gl_GlobalInvocationID.x], bs[gl_GlobalInvocationID.x]);
   vec4 copy_values[2];
   copy_values = const_values;
   Composite c = Composite(values[0], copy_values[1]);

   as[0] = values[gl_LocalInvocationIndex];
   bs[1] = c.b;
}