tst/rand/StabilityTest.cpp

   1 #include "StabilityTest.hpp"
   2
   3 #include "rand/GaloisLFSR.hpp"
   4 #include "rand/SimplexNoise.hpp"
   5
   6 #include <cstdint>
   7 #include <string>
   8 #include <sstream>
   9 #include <glm/gtx/io.hpp>
  10
  11 CPPUNIT_TEST_SUITE_REGISTRATION(blank::test::StabilityTest);
  12
  13 using namespace std;
  14
  15
  16 namespace blank {
  17 namespace test {
  18
  19 void StabilityTest::setUp() {
  20
  21 }
  22
  23 void StabilityTest::tearDown() {
  24
  25 }
  26
  27
  28 void StabilityTest::testRNG() {
  29         GaloisLFSR random(0);
  30         uint16_t value;
  31         random(value);
  32         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  33                 "unexpected value #1 from RNG",
  34                 uint16_t(0x0000), value
  35         );
  36         random(value);
  37         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  38                 "unexpected value #2 from RNG",
  39                 uint16_t(0x0000), value
  40         );
  41         random(value);
  42         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  43                 "unexpected value #3 from RNG",
  44                 uint16_t(0xB000), value
  45         );
  46         random(value);
  47         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  48                 "unexpected value #4 from RNG",
  49                 uint16_t(0x0000), value
  50         );
  51         random(value);
  52         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  53                 "unexpected value #5 from RNG",
  54                 uint16_t(0x0000), value
  55         );
  56         random(value);
  57         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  58                 "unexpected value #6 from RNG",
  59                 uint16_t(0x0000), value
  60         );
  61         random(value);
  62         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  63                 "unexpected value #7 from RNG",
  64                 uint16_t(0x4500), value
  65         );
  66         random(value);
  67         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  68                 "unexpected value #8 from RNG",
  69                 uint16_t(0x0000), value
  70         );
  71         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  72                 "unexpected value #9 from RNG",
  73                 uint16_t(0x0000), value
  74         );
  75         random(value);
  76         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  77                 "unexpected value #10 from RNG",
  78                 uint16_t(0x0000), value
  79         );
  80         random(value);
  81         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  82                 "unexpected value #11 from RNG",
  83                 uint16_t(0x0000), value
  84         );
  85         random(value);
  86         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  87                 "unexpected value #12 from RNG",
  88                 uint16_t(0x2E70), value
  89         );
  90         random(value);
  91         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  92                 "unexpected value #13 from RNG",
  93                 uint16_t(0x0000), value
  94         );
  95         random(value);
  96         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  97                 "unexpected value #14 from RNG",
  98                 uint16_t(0x0000), value
  99         );
 100         random(value);
 101         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 102                 "unexpected value #15 from RNG",
 103                 uint16_t(0x0000), value
 104         );
 105         random(value);
 106         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 107                 "unexpected value #16 from RNG",
 108                 uint16_t(0x1011), value
 109         );
 110         random(value);
 111         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 112                 "unexpected value #17 from RNG",
 113                 uint16_t(0x0000), value
 114         );
 115         random(value);
 116         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 117                 "unexpected value #18 from RNG",
 118                 uint16_t(0x0000), value
 119         );
 120         random(value);
 121         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 122                 "unexpected value #19 from RNG",
 123                 uint16_t(0xB000), value
 124         );
 125         random(value);
 126         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 127                 "unexpected value #20 from RNG",
 128                 uint16_t(0x0B0B), value
 129         );
 130         random(value);
 131         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 132                 "unexpected value #21 from RNG",
 133                 uint16_t(0x0000), value
 134         );
 135         random(value);
 136         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 137                 "unexpected value #22 from RNG",
 138                 uint16_t(0x0000), value
 139         );
 140         random(value);
 141         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 142                 "unexpected value #23 from RNG",
 143                 uint16_t(0x1500), value
 144         );
 145         random(value);
 146         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 147                 "unexpected value #24 from RNG",
 148                 uint16_t(0x0454), value
 149         );
 150         random(value);
 151         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 152                 "unexpected value #25 from RNG",
 153                 uint16_t(0x0000), value
 154         );
 155         random(value);
 156         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 157                 "unexpected value #26 from RNG",
 158                 uint16_t(0x0000), value
 159         );
 160         random(value);
 161         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 162                 "unexpected value #27 from RNG",
 163                 uint16_t(0xC970), value
 164         );
 165         random(value);
 166         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 167                 "unexpected value #28 from RNG",
 168                 uint16_t(0x02E5), value
 169         );
 170         random(value);
 171         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 172                 "unexpected value #29 from RNG",
 173                 uint16_t(0x0000), value
 174         );
 175         random(value);
 176         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 177                 "unexpected value #30 from RNG",
 178                 uint16_t(0x0000), value
 179         );
 180         random(value);
 181         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 182                 "unexpected value #31 from RNG",
 183                 uint16_t(0x0101), value
 184         );
 185         random(value);
 186         CPPUNIT_ASSERT_EQUAL_MESSAGE(
 187                 "unexpected value #32 from RNG",
 188                 uint16_t(0x0100), value
 189         );
 190 }
 191
 192 void StabilityTest::testSimplex() {
 193         SimplexNoise noise(0);
 194
 195         Assert(noise, glm::vec3(0.0f, 0.0f, 0.0f),  0.0f);
 196         Assert(noise, glm::vec3(0.0f, 0.0f, 1.0f),  0.652221322059631f);
 197         Assert(noise, glm::vec3(0.0f, 1.0f, 0.0f),  0.867977976799011f);
 198         Assert(noise, glm::vec3(0.0f, 1.0f, 1.0f), -0.107878111302853f);
 199         Assert(noise, glm::vec3(1.0f, 0.0f, 0.0f), -0.107878260314465f);
 200         Assert(noise, glm::vec3(1.0f, 0.0f, 1.0f), -6.31356940061778e-08f);
 201         Assert(noise, glm::vec3(1.0f, 1.0f, 0.0f), -0.107878245413303f);
 202         Assert(noise, glm::vec3(1.0f, 1.0f, 1.0f),  0.0f);
 203
 204         Assert(noise, glm::vec3( 0.0f,  0.0f, -1.0f), -0.107878483831882f);
 205         Assert(noise, glm::vec3( 0.0f, -1.0f,  0.0f), -0.760099768638611f);
 206         Assert(noise, glm::vec3( 0.0f, -1.0f, -1.0f),  0.0f);
 207         Assert(noise, glm::vec3(-1.0f,  0.0f,  0.0f),  0.760099768638611f);
 208         Assert(noise, glm::vec3(-1.0f,  0.0f, -1.0f),  0.0f);
 209         Assert(noise, glm::vec3(-1.0f, -1.0f,  0.0f), -0.107878118753433f);
 210         Assert(noise, glm::vec3(-1.0f, -1.0f, -1.0f),  0.0f);
 211 }
 212
 213 void StabilityTest::Assert(
 214         const SimplexNoise &noise,
 215         const glm::vec3 &position,
 216         float expected
 217 ) {
 218         stringstream msg;
 219         msg << "unexpected simplex noise value at " << position;
 220         CPPUNIT_ASSERT_DOUBLES_EQUAL_MESSAGE(
 221                 msg.str(),
 222                 expected, noise(position), numeric_limits<float>::epsilon()
 223         );
 224 }
 225
 226 }
 227 }