X-Git-Url: https://git.localhorst.tv/?a=blobdiff_plain;f=tst%2Frand%2FStabilityTest.cpp;fp=tst%2Frand%2FStabilityTest.cpp;h=c6c6339d6aa955bd7336de566d00b4e64f38921c;hb=644b3fb597ec32a6238f7d0b13a3271bce9fb9c5;hp=0000000000000000000000000000000000000000;hpb=ed63638006af93bf0cf010ed48706b893ac0da35;p=blobs.git

diff --git a/tst/rand/StabilityTest.cpp b/tst/rand/StabilityTest.cpp
new file mode 100644
index 0000000..c6c6339
--- /dev/null
+++ b/tst/rand/StabilityTest.cpp
@@ -0,0 +1,305 @@
+#include "StabilityTest.hpp"
+
+#include "rand/GaloisLFSR.hpp"
+#include "rand/SimplexNoise.hpp"
+#include "rand/WorleyNoise.hpp"
+
+#include <cstdint>
+#include <string>
+#include <sstream>
+#include <glm/gtx/io.hpp>
+
+CPPUNIT_TEST_SUITE_REGISTRATION(blobs::rand::test::StabilityTest);
+
+using namespace std;
+
+
+namespace blobs {
+namespace rand {
+namespace test {
+
+void StabilityTest::setUp() {
+
+}
+
+void StabilityTest::tearDown() {
+
+}
+
+
+void StabilityTest::testRNG() {
+	GaloisLFSR random(0);
+	uint16_t value;
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #1 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #2 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #3 from RNG",
+		uint16_t(0xB000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #4 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #5 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #6 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #7 from RNG",
+		uint16_t(0x4500), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #8 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #9 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #10 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #11 from RNG",
+		uint16_t(0x2E70), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #12 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #13 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #14 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #15 from RNG",
+		uint16_t(0x1011), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #16 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #17 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #18 from RNG",
+		uint16_t(0xB000), value
+	);
+	value = random.Next<uint16_t>();
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #19 from RNG (using Next())",
+		uint16_t(0x0B0B), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #20 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #21 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #22 from RNG",
+		uint16_t(0x1500), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #23 from RNG",
+		uint16_t(0x0454), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #24 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #25 from RNG",
+		uint16_t(0x0000), value
+	);
+	value = random.Next<uint16_t>();
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #26 from RNG (using Next())",
+		uint16_t(0xC970), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #27 from RNG",
+		uint16_t(0x02E5), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #28 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #29 from RNG",
+		uint16_t(0x0000), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #30 from RNG",
+		uint16_t(0x0101), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #31 from RNG",
+		uint16_t(0x0100), value
+	);
+	random(value);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected value #32 from RNG",
+		uint16_t(0x0000), value
+	);
+
+	GaloisLFSR random1(1);
+	uint16_t value1;
+	for (int i = 0; i < 32; ++i) {
+		random1(value1);
+	}
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"RNG with seeds 0 and 1 differ",
+		value, value1
+	);
+
+	GaloisLFSR random_bool(0);
+	bool value_bool;
+	for (int i = 0; i < (16 * 32); ++i) {
+		random_bool(value_bool);
+	}
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected result for bool",
+		false, value_bool
+	);
+
+	GaloisLFSR random8(0);
+	uint8_t value8;
+	for (int i = 0; i < 31; ++i) {
+		random8(value8);
+	}
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected result for uint8",
+		uint8_t(0x10), value8
+	);
+
+	GaloisLFSR random32(0);
+	uint32_t value32;
+	for (int i = 0; i < 16; ++i) {
+		random32(value32);
+	}
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"unexpected result for uint32",
+		uint32_t(0xB0000000), value32
+	);
+}
+
+void StabilityTest::testSimplex() {
+	SimplexNoise noise(0);
+
+	Assert(noise, glm::vec3(0.0f, 0.0f, 0.0f),  0.0f);
+	Assert(noise, glm::vec3(0.0f, 0.0f, 1.0f),  0.652221322059631f);
+	Assert(noise, glm::vec3(0.0f, 1.0f, 0.0f),  0.867977976799011f);
+	Assert(noise, glm::vec3(0.0f, 1.0f, 1.0f), -0.107878111302853f);
+	Assert(noise, glm::vec3(1.0f, 0.0f, 0.0f), -0.107878260314465f);
+	Assert(noise, glm::vec3(1.0f, 0.0f, 1.0f), -6.31356940061778e-08f);
+	Assert(noise, glm::vec3(1.0f, 1.0f, 0.0f), -0.107878245413303f);
+	Assert(noise, glm::vec3(1.0f, 1.0f, 1.0f),  0.0f);
+
+	Assert(noise, glm::vec3( 0.0f,  0.0f, -1.0f), -0.107878483831882f);
+	Assert(noise, glm::vec3( 0.0f, -1.0f,  0.0f), -0.760099768638611f);
+	Assert(noise, glm::vec3( 0.0f, -1.0f, -1.0f),  0.0f);
+	Assert(noise, glm::vec3(-1.0f,  0.0f,  0.0f),  0.760099768638611f);
+	Assert(noise, glm::vec3(-1.0f,  0.0f, -1.0f),  0.0f);
+	Assert(noise, glm::vec3(-1.0f, -1.0f,  0.0f), -0.107878118753433f);
+	Assert(noise, glm::vec3(-1.0f, -1.0f, -1.0f),  0.0f);
+}
+
+void StabilityTest::testWorley() {
+	WorleyNoise noise(0);
+
+	Assert(noise, glm::vec3(0.0f, 0.0f, 0.0f), -0.117765009403229f);
+	Assert(noise, glm::vec3(0.0f, 0.0f, 1.0f), -0.209876894950867f);
+	Assert(noise, glm::vec3(0.0f, 1.0f, 0.0f), -0.290086328983307f);
+	Assert(noise, glm::vec3(0.0f, 1.0f, 1.0f), -0.332393705844879f);
+	Assert(noise, glm::vec3(1.0f, 0.0f, 0.0f), -0.621925830841064f);
+	Assert(noise, glm::vec3(1.0f, 0.0f, 1.0f), -0.338455379009247f);
+	Assert(noise, glm::vec3(1.0f, 1.0f, 0.0f), -0.386664032936096f);
+	Assert(noise, glm::vec3(1.0f, 1.0f, 1.0f), -0.533940434455872f);
+
+	Assert(noise, glm::vec3( 0.0f,  0.0f, -1.0f), -0.425480604171753f);
+	Assert(noise, glm::vec3( 0.0f, -1.0f,  0.0f), -0.189745843410492f);
+	Assert(noise, glm::vec3( 0.0f, -1.0f, -1.0f), -0.30408102273941f);
+	Assert(noise, glm::vec3(-1.0f,  0.0f,  0.0f), -0.618566155433655f);
+	Assert(noise, glm::vec3(-1.0f,  0.0f, -1.0f), -0.060045599937439f);
+	Assert(noise, glm::vec3(-1.0f, -1.0f,  0.0f), -0.366827547550201f);
+	Assert(noise, glm::vec3(-1.0f, -1.0f, -1.0f), -0.575981974601746f);
+}
+
+void StabilityTest::Assert(
+	const SimplexNoise &noise,
+	const glm::vec3 &position,
+	float expected
+) {
+	stringstream msg;
+	msg << "unexpected simplex noise value at " << position;
+	CPPUNIT_ASSERT_DOUBLES_EQUAL_MESSAGE(
+		msg.str(),
+		expected, noise(position), numeric_limits<float>::epsilon()
+	);
+}
+
+void StabilityTest::Assert(
+	const WorleyNoise &noise,
+	const glm::vec3 &position,
+	float expected
+) {
+	stringstream msg;
+	msg << "unexpected worley noise value at " << position;
+	CPPUNIT_ASSERT_DOUBLES_EQUAL_MESSAGE(
+		msg.str(),
+		expected, noise(position), numeric_limits<float>::epsilon()
+	);
+}
+
+}
+}
+}