shaders-msl/comp/dowhile.comp

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

layout(std430, binding = 0) readonly buffer SSBO
{
    mat4 mvp;
    vec4 in_data[];
};

layout(std430, binding = 1) writeonly buffer SSBO2
{
    vec4 out_data[];
};

int i;

void main()
{
    uint ident = gl_GlobalInvocationID.x;

    i = 0;
    vec4 idat = in_data[ident];
    do
    {
        idat = mvp * idat;
        i++;
    } while(i < 16);

    out_data[ident] = idat;
}