shaders-msl/comp/mat3.comp

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

layout(std430, binding = 1) writeonly buffer SSBO2
{
    mat3 out_data[];
};

void main()
{
    uint ident = gl_GlobalInvocationID.x;
    out_data[ident] = mat3(vec3(10.0), vec3(20.0), vec3(40.0));
}