1/* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.example.android.rs.matherr; 18 19import android.content.res.Resources; 20import android.renderscript.*; 21import java.lang.Float; 22import java.lang.Math; 23 24public class MathErr { 25 private RenderScript mRS; 26 private Allocation mAllocationSrc; 27 private Allocation mAllocationRes; 28 private ScriptC_math_err mScript; 29 private java.util.Random mRand = new java.util.Random(); 30 31 private final int BUF_SIZE = 4096; 32 float mSrc[] = new float[BUF_SIZE]; 33 float mRef[] = new float[BUF_SIZE]; 34 float mRes[] = new float[BUF_SIZE]; 35 36 MathErr(RenderScript rs) { 37 mRS = rs; 38 mScript = new ScriptC_math_err(mRS); 39 40 mAllocationSrc = Allocation.createSized(rs, Element.F32(rs), BUF_SIZE); 41 mAllocationRes = Allocation.createSized(rs, Element.F32(rs), BUF_SIZE); 42 43 testExp2(); 44 testLog2(); 45 } 46 47 void buildRand() { 48 for (int i=0; i < BUF_SIZE; i++) { 49 mSrc[i] = (((float)i) / 9) - 200; 50 //mSrc[i] = Float.intBitsToFloat(mRand.nextInt()); 51 } 52 mAllocationSrc.copyFrom(mSrc); 53 } 54 55 void logErr() { 56 mAllocationRes.copyTo(mRes); 57 for (int i=0; i < BUF_SIZE; i++) { 58 int err = Float.floatToRawIntBits(mRef[i]) - Float.floatToRawIntBits(mRes[i]); 59 err = Math.abs(err); 60 if (err > 8096) { 61 android.util.Log.v("err", "error " + err + " src " + mSrc[i] + " ref " + mRef[i] + " res " + mRes[i]); 62 } 63 } 64 } 65 66 void testExp2() { 67 android.util.Log.v("err", "testing exp2"); 68 buildRand(); 69 mScript.forEach_testExp2(mAllocationSrc, mAllocationRes); 70 for (int i=0; i < BUF_SIZE; i++) { 71 mRef[i] = (float)Math.pow(2.f, mSrc[i]); 72 } 73 logErr(); 74 } 75 76 void testLog2() { 77 android.util.Log.v("err", "testing log2"); 78 buildRand(); 79 mScript.forEach_testLog2(mAllocationSrc, mAllocationRes); 80 for (int i=0; i < BUF_SIZE; i++) { 81 mRef[i] = (float)Math.log(mSrc[i]) * 1.442695041f; 82 } 83 logErr(); 84 } 85 86} 87