RoundedRectangle.hlsl

    float3 newPosTransform = mul(float3(vsInput.position.xy, 1), float3x3(transformMatrix._11_12_13, transformMatrix._21_22_23, transformMatrix._31_32_33));
    newPosTransform.xy /= newPosTransform.z;

    float4 posTransformed = float4(newPosTransform.xy, 0, 1);
    float xbase = -viewportSize.x / 2.0f;
    float ybase = viewportSize.y / 2.0f;
    posTransformed.x += xbase;
    posTransformed.y = ybase - posTransformed.y;

    output.position = mul(posTransformed, orthoProjMatrix);