/*-------------------------------------------------------------------------
* drawElements C++ Base Library
* -----------------------------
*
* Copyright 2014 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.
*
*//*!
* \file
* \brief Random number generator utilities.
*//*--------------------------------------------------------------------*/
#include "deRandom.hpp"
inline bool operator== (const deRandom& a, const deRandom& b)
{
return a.x == b.x && a.y == b.y && a.z == b.z && a.w == b.w;
}
inline bool operator!= (const deRandom& a, const deRandom& b)
{
return a.x != b.x || a.y != b.y || a.z != b.z || a.w != b.w;
}
namespace de
{
bool Random::operator== (const Random& other) const
{
return m_rnd == other.m_rnd;
}
bool Random::operator!= (const Random& other) const
{
return m_rnd != other.m_rnd;
}
void Random_selfTest (void)
{
// getBool()
{
static const bool expected[] = { true, false, false, false, true, true, false, false, false, false, false, false, true, false, true, false, false, false, false, true };
Random rnd(4789);
for (int i = 0; i < DE_LENGTH_OF_ARRAY(expected); i++)
DE_TEST_ASSERT(expected[i] == rnd.getBool());
}
// getInt(a, b)
{
static const int expected[] = { -6628, -6483, 802, -7758, -8463, 3165, 9216, 3107, 1851, 8707 };
Random rnd(4789);
for (int i = 0; i < DE_LENGTH_OF_ARRAY(expected); i++)
DE_TEST_ASSERT(expected[i] == rnd.getInt(-10000, 10000));
}
// getUint32()
{
static const deUint32 expected[] = { 3694588092u, 3135240271u, 882874943u, 2108407657u, 376640368u, 1395362929u, 2611849801u, 3151830690u, 901476922u, 989608184u };
Random rnd(4789);
for (int i = 0; i < DE_LENGTH_OF_ARRAY(expected); i++)
DE_TEST_ASSERT(expected[i] == rnd.getUint32());
}
// getUint64()
{
static const deUint64 expected[] = { 15868135030466279503ull, 3791919008751271785ull, 1617658064308767857ull, 11217809480510938786ull, 3871813899078351096ull, 14768747990643252542ull, 8163484985646009214ull, 14928018127607458387ull, 432108271545246292ull, 7318152987070448462ull };
Random rnd(4789);
for (int i = 0; i < DE_LENGTH_OF_ARRAY(expected); i++)
DE_TEST_ASSERT(expected[i] == rnd.getUint64());
}
// getFloat()
{
static const float expected[] = { 0.763413f, 0.679680f, 0.288965f, 0.854431f, 0.403095f, 0.198132f, 0.729899f, 0.741484f, 0.358263f, 0.686578f };
const float epsilon = 0.01f;
Random rnd(4789);
for (int i = 0; i < DE_LENGTH_OF_ARRAY(expected); i++)
DE_TEST_ASSERT(de::abs(expected[i] - rnd.getFloat()) < epsilon);
}
// getFloat(a, b)
{
static const float expected[] = { 824.996643f, 675.039185f, -24.691774f, 987.999756f, 179.702286f, -187.365463f, 764.975647f, 785.724182f, 99.413582f, 687.392151f };
const float epsilon = 0.01f;
Random rnd(4789);
for (int i = 0; i < DE_LENGTH_OF_ARRAY(expected); i++)
DE_TEST_ASSERT(de::abs(expected[i] - rnd.getFloat(-542.2f, 1248.7f)) < epsilon);
}
// choose(first, last, resultOut, num)
{
static const int items[] = { 3, 42, 45, 123, 654, -123, -90, 0, 43 };
const int numItemsPicked = 5;
static const int expected[][numItemsPicked] =
{
{ -123, 42, -90, 123, 43 },
{ 43, 0, -90, 123, -123 },
{ 3, 42, 45, 123, 0 },
{ 3, 42, 45, -123, 654 },
{ 3, 43, 45, -90, -123 },
{ -90, 0, 45, -123, 654 },
{ 3, 42, 43, 123, -123 },
{ -90, 43, 45, 123, 654 },
{ 0, 42, 45, 123, 654 },
{ 0, -90, 45, -123, 654 }
};
Random rnd(4789);
for (int i = 0; i < DE_LENGTH_OF_ARRAY(expected); i++)
{
int itemsDst[numItemsPicked];
rnd.choose(DE_ARRAY_BEGIN(items), DE_ARRAY_END(items), &itemsDst[0], numItemsPicked);
for (int j = 0; j < numItemsPicked; j++)
DE_TEST_ASSERT(expected[i][j] == itemsDst[j]);
}
}
// choose(first, last)
{
static const int items[] = { 3, 42, 45, 123, 654, -123, -90, 0, 43 };
static const int expected[] = { 43, 123, -90, -90, 0, 3, 43, 0, 654, 43 };
Random rnd(4789);
for (int i = 0; i < DE_LENGTH_OF_ARRAY(expected); i++)
DE_TEST_ASSERT(expected[i] == rnd.choose<int>(DE_ARRAY_BEGIN(items), DE_ARRAY_END(items)));
}
// chooseWeighted(first, last, weights)
{
static const int items[] = { 3, 42, 45, 123, 654, -123, -90, 0 };
static const float weights[] = { 0.4f, 0.6f, 1.5f, 0.5f, 1.2f, 0.3f, 0.2f, 1.4f };
DE_STATIC_ASSERT(DE_LENGTH_OF_ARRAY(items) == DE_LENGTH_OF_ARRAY(weights));
static const int expected[] = { -90, 654, 45, 0, 45, 45, -123, -90, 45, 654 };
Random rnd(4789);
for (int i = 0; i < DE_LENGTH_OF_ARRAY(expected); i++)
DE_TEST_ASSERT(expected[i] == rnd.chooseWeighted<int>(DE_ARRAY_BEGIN(items), DE_ARRAY_END(items), &weights[0]));
}
// suffle()
{
int items[] = { 3, 42, 45, 123, 654, -123, -90, 0, 43 };
static const int expected[][DE_LENGTH_OF_ARRAY(items)] =
{
{ 45, 43, 654, -123, 123, 42, -90, 0, 3 },
{ 0, 43, 3, 42, -123, -90, 654, 45, 123 },
{ 42, 43, 654, 3, 0, 123, -90, -123, 45 },
{ 3, 45, 43, 42, 123, 654, 0, -90, -123 },
{ 42, 45, -123, 0, -90, 654, 3, 123, 43 },
{ 654, -123, 3, 42, 43, 0, -90, 123, 45 },
{ 0, 3, 654, 42, -90, 45, -123, 123, 43 },
{ 654, 3, 45, 42, -123, -90, 123, 43, 0 },
{ -90, 123, 43, 654, 0, 42, 45, 3, -123 },
{ 0, -123, 45, 42, 43, 123, 3, -90, 654 }
};
Random rnd(4789);
for (int i = 0; i < DE_LENGTH_OF_ARRAY(expected); i++)
{
rnd.shuffle(DE_ARRAY_BEGIN(items), DE_ARRAY_END(items));
for(int j = 0; j < DE_LENGTH_OF_ARRAY(items); j++)
DE_TEST_ASSERT(expected[i][j] == items[j]);
}
}
}
} // de