From cca8569a4147cf1f8acd3ce7b650804d790e86fa Mon Sep 17 00:00:00 2001
From: Christophe Riccio <christophe.riccio@unity3d.com>
Date: Wed, 8 Aug 2018 00:17:29 +0200
Subject: [PATCH] Fixed matrix comparison as constexpr

---
 glm/ext/matrix_relational.inl  | 4 ++--
 test/core/core_type_mat4x4.cpp | 5 +++++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/glm/ext/matrix_relational.inl b/glm/ext/matrix_relational.inl
index d6054f33..f7a82dda 100644
--- a/glm/ext/matrix_relational.inl
+++ b/glm/ext/matrix_relational.inl
@@ -22,7 +22,7 @@ namespace glm
 	template<length_t C, length_t R, typename T, qualifier Q>
 	GLM_FUNC_QUALIFIER GLM_CONSTEXPR vec<C, bool, Q> equal(mat<C, R, T, Q> const& a, mat<C, R, T, Q> const& b, vec<C, T, Q> const& Epsilon)
 	{
-		vec<C, bool, Q> Result;
+		vec<C, bool, Q> Result(true);
 		for(length_t i = 0; i < C; ++i)
 			Result[i] = all(equal(a[i], b[i], Epsilon[i]));
 		return Result;
@@ -43,7 +43,7 @@ namespace glm
 	template<length_t C, length_t R, typename T, qualifier Q>
 	GLM_FUNC_QUALIFIER GLM_CONSTEXPR vec<C, bool, Q> notEqual(mat<C, R, T, Q> const& a, mat<C, R, T, Q> const& b, vec<C, T, Q> const& Epsilon)
 	{
-		vec<C, bool, Q> Result;
+		vec<C, bool, Q> Result(true);
 		for(length_t i = 0; i < C; ++i)
 			Result[i] = any(notEqual(a[i], b[i], Epsilon[i]));
 		return Result;
diff --git a/test/core/core_type_mat4x4.cpp b/test/core/core_type_mat4x4.cpp
index a056112c..0be87f18 100644
--- a/test/core/core_type_mat4x4.cpp
+++ b/test/core/core_type_mat4x4.cpp
@@ -4,6 +4,7 @@
 #include <glm/ext/matrix_relational.hpp>
 #include <glm/matrix.hpp>
 #include <glm/mat4x4.hpp>
+#include <glm/vec4.hpp>
 #include <vector>
 
 template <typename matType, typename vecType>
@@ -174,6 +175,10 @@ static int test_constexpr()
 {
 #if GLM_HAS_CONSTEXPR
 	static_assert(glm::mat4::length() == 4, "GLM: Failed constexpr");
+	constexpr glm::mat4 A(1.f);
+	constexpr glm::mat4 B(1.f);
+	constexpr glm::bvec4 C = glm::equal(A, B, 0.01f);
+	static_assert(glm::all(C), "GLM: Failed constexpr");
 #endif
 
 	return 0;