external: import local copy of GLM 0.9.7.2

This allows building against the same version of GLM across all targets
and not deal with API changes of newer GLM versions which introduce
regressions. Long term we want to migrate away from GLM and stick to a
minimal self-written subset.

external/glm/test/gtx/gtx_random.cpp

@@ -0,0 +1,99 @@
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// OpenGL Mathematics Copyright (c) 2005 - 2012 G-Truc Creation (www.g-truc.net)
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Created : 2011-05-31
+// Updated : 2011-05-31
+// Licence : This source is under MIT licence
+// File    : test/gtx/random.cpp
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+#include <glm/glm.hpp>
+#include <glm/gtx/random.hpp>
+#include <glm/gtx/epsilon.hpp>
+#include <iostream>
+
+int test_signedRand1()
+{
+	int Error = 0;
+
+	{
+		float ResultFloat = 0.0f;
+		double ResultDouble = 0.0f;
+		for(std::size_t i = 0; i < 100000; ++i)
+		{
+			ResultFloat += glm::signedRand1<float>();
+			ResultDouble += glm::signedRand1<double>();
+		}
+
+		Error += glm::equalEpsilon(ResultFloat, 0.0f, 0.0001f);
+		Error += glm::equalEpsilon(ResultDouble, 0.0, 0.0001);
+	}
+
+	return Error;
+}
+
+int test_normalizedRand2()
+{
+	int Error = 0;
+
+	{
+		std::size_t Max = 100000;
+		float ResultFloat = 0.0f;
+		double ResultDouble = 0.0f;
+		for(std::size_t i = 0; i < Max; ++i)
+		{
+			ResultFloat += glm::length(glm::normalizedRand2<float>());
+			ResultDouble += glm::length(glm::normalizedRand2<double>());
+		}
+
+		Error += glm::equalEpsilon(ResultFloat, float(Max), 0.000001f) ? 0 : 1;
+		Error += glm::equalEpsilon(ResultDouble, double(Max), 0.000001) ? 0 : 1;
+		assert(!Error);
+	}
+
+	return Error;
+}
+
+int test_normalizedRand3()
+{
+	int Error = 0;
+
+	{
+		std::size_t Max = 100000;
+		float ResultFloatA = 0.0f;
+		float ResultFloatB = 0.0f;
+		float ResultFloatC = 0.0f;
+		double ResultDoubleA = 0.0f;
+		double ResultDoubleB = 0.0f;
+		double ResultDoubleC = 0.0f;
+		for(std::size_t i = 0; i < Max; ++i)
+		{
+			ResultFloatA += glm::length(glm::normalizedRand3<float>());
+			ResultDoubleA += glm::length(glm::normalizedRand3<double>());
+			ResultFloatB += glm::length(glm::normalizedRand3(2.0f, 2.0f));
+			ResultDoubleB += glm::length(glm::normalizedRand3(2.0, 2.0));
+			ResultFloatC += glm::length(glm::normalizedRand3(1.0f, 3.0f));
+			ResultDoubleC += glm::length(glm::normalizedRand3(1.0, 3.0));
+		}
+
+		Error += glm::equalEpsilon(ResultFloatA, float(Max), 0.0001f) ? 0 : 1;
+		Error += glm::equalEpsilon(ResultDoubleA, double(Max), 0.0001) ? 0 : 1;
+		Error += glm::equalEpsilon(ResultFloatB, float(Max * 2), 0.0001f) ? 0 : 1;
+		Error += glm::equalEpsilon(ResultDoubleB, double(Max * 2), 0.0001) ? 0 : 1;
+		Error += (ResultFloatC >= float(Max) && ResultFloatC <= float(Max * 3)) ? 0 : 1;
+		Error += (ResultDoubleC >= double(Max) && ResultDoubleC <= double(Max * 3)) ? 0 : 1;
+	}
+
+	return Error;
+}
+
+int main()
+{
+	int Error = 0;
+
+	Error += test_signedRand1();
+	Error += test_normalizedRand2();
+	Error += test_normalizedRand3();
+
+	return Error;
+}