如何在android中通过renderscript使用平滑步骤函数

#pragma version(1)
#pragma rs java_package_name(com.example)

float smoothstep(float edge0, float edge1, float x) {
    float t = clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
    return t * t * (3.0f - 2.0f * t);
}

import android.support.v8.renderscript.*;

public class MainActivity extends AppCompatActivity {
    private RenderScript renderScript;
    private ScriptC_smoothstep smoothstepScript;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        renderScript = RenderScript.create(this);
        smoothstepScript = new ScriptC_smoothstep(renderScript);
        
        float edge0 = 0.2f;
        float edge1 = 0.8f;
        float x = 0.5f;
        
        float result = smoothstepScript.smoothstep(edge0, edge1, x);
        
        Log.d("Smoothstep", "Result: " + result);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        renderScript.destroy();
    }
}

android {
    ...
    defaultConfig {
        ...
        renderscriptTargetApi 19
        renderscriptSupportModeEnabled true
    }
}