#include <metal_stdlib>
#include <simd/simd.h>

using namespace metal;

struct model_t
{
    float3x3 mtx_rm;
};

constant uint3 gl_WorkGroupSize [[maybe_unused]] = uint3(1u);

kernel void main0(device model_t& model [[buffer(0)]])
{
    float3x3 mtx_cm = transpose(model.mtx_rm);
    float3x3 mtx1 = mtx_cm * float3x3(float3(4.0, -3.0, 1.0), float3(-7.0, 7.0, -7.0), float3(-5.0, 6.0, -8.0));
    if (mtx1[0].x != 0.0)
    {
        model.mtx_rm = transpose(float3x3(float3(-5.0, -3.0, -5.0), float3(-2.0, 2.0, -5.0), float3(6.0, 3.0, -8.0)));
    }
}