resources/sksl/mesh/MeshFragment.mfrag

struct Varyings {
    float2 position;
    float2 coords;
};

uniform half3x3 m;
layout(color) uniform half4 color;

float2 main(const Varyings varyings, out half4 c) {
    c = color;
    return (m*float3(varyings.coords, 1)).xy;
}