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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.rs.matherr;
import android.content.res.Resources;
import android.renderscript.*;
import java.lang.Float;
import java.lang.Math;
public class MathErr {
private RenderScript mRS;
private Allocation mAllocationSrc;
private Allocation mAllocationRes;
private ScriptC_math_err mScript;
private java.util.Random mRand = new java.util.Random();
private final int BUF_SIZE = 4096;
float mSrc[] = new float[BUF_SIZE];
float mRef[] = new float[BUF_SIZE];
float mRes[] = new float[BUF_SIZE];
MathErr(RenderScript rs) {
mRS = rs;
mScript = new ScriptC_math_err(mRS);
mAllocationSrc = Allocation.createSized(rs, Element.F32(rs), BUF_SIZE);
mAllocationRes = Allocation.createSized(rs, Element.F32(rs), BUF_SIZE);
testExp2();
testLog2();
}
void buildRand() {
for (int i=0; i < BUF_SIZE; i++) {
mSrc[i] = (((float)i) / 9) - 200;
//mSrc[i] = Float.intBitsToFloat(mRand.nextInt());
}
mAllocationSrc.copyFrom(mSrc);
}
void logErr() {
mAllocationRes.copyTo(mRes);
for (int i=0; i < BUF_SIZE; i++) {
int err = Float.floatToRawIntBits(mRef[i]) - Float.floatToRawIntBits(mRes[i]);
err = Math.abs(err);
if (err > 8096) {
android.util.Log.v("err", "error " + err + " src " + mSrc[i] + " ref " + mRef[i] + " res " + mRes[i]);
}
}
}
void testExp2() {
android.util.Log.v("err", "testing exp2");
buildRand();
mScript.forEach_testExp2(mAllocationSrc, mAllocationRes);
for (int i=0; i < BUF_SIZE; i++) {
mRef[i] = (float)Math.pow(2.f, mSrc[i]);
}
logErr();
}
void testLog2() {
android.util.Log.v("err", "testing log2");
buildRand();
mScript.forEach_testLog2(mAllocationSrc, mAllocationRes);
for (int i=0; i < BUF_SIZE; i++) {
mRef[i] = (float)Math.log(mSrc[i]) * 1.442695041f;
}
logErr();
}
}
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