From b887259974cf1b6587e86f7c9ca7086119303520 Mon Sep 17 00:00:00 2001
From: Konstantin Podsvirov <konstantin@podsvirov.pro>
Date: Mon, 27 Jan 2020 14:11:29 +0300
Subject: [PATCH] Bindings: Improved FreeGLUT support for MinGW (#3004)

---
 examples/example_glut_opengl2/Makefile | 8 +++++++-
 examples/example_glut_opengl2/main.cpp | 4 ++--
 examples/imgui_impl_glut.cpp           | 5 +++++
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/examples/example_glut_opengl2/Makefile b/examples/example_glut_opengl2/Makefile
index c381c0c9..70576b8f 100644
--- a/examples/example_glut_opengl2/Makefile
+++ b/examples/example_glut_opengl2/Makefile
@@ -41,7 +41,13 @@ endif
 
 ifeq ($(findstring MINGW,$(UNAME_S)),MINGW)
 	ECHO_MESSAGE = "MinGW"
-	LIBS += -lgdi32 -lopengl32 -limm32 -lglut
+	LIBS += -lgdi32 -lopengl32 -limm32
+ifeq ($(shell pkg-config freeglut --exists 2> /dev/null && echo yes || echo no),yes)
+	CXXFLAGS += $(shell pkg-config freeglut --cflags)
+	LIBS += $(shell pkg-config freeglut --libs)
+else
+	LIBS += -lglut
+endif
 	CFLAGS = $(CXXFLAGS)
 endif
 
diff --git a/examples/example_glut_opengl2/main.cpp b/examples/example_glut_opengl2/main.cpp
index 03db3fce..d36c1f84 100644
--- a/examples/example_glut_opengl2/main.cpp
+++ b/examples/example_glut_opengl2/main.cpp
@@ -6,8 +6,8 @@
 // !!! Nowadays, prefer using GLFW or SDL instead!
 
 #include "imgui.h"
-#include "../imgui_impl_glut.h"
-#include "../imgui_impl_opengl2.h"
+#include "imgui_impl_glut.h"
+#include "imgui_impl_opengl2.h"
 #ifdef __APPLE__
     #include <GLUT/glut.h>
 #else
diff --git a/examples/imgui_impl_glut.cpp b/examples/imgui_impl_glut.cpp
index fe519d9c..3c17bbfc 100644
--- a/examples/imgui_impl_glut.cpp
+++ b/examples/imgui_impl_glut.cpp
@@ -39,7 +39,12 @@ static int g_Time = 0;          // Current time, in milliseconds
 bool ImGui_ImplGLUT_Init()
 {
     ImGuiIO& io = ImGui::GetIO();
+
+#ifdef FREEGLUT
+    io.BackendPlatformName ="imgui_impl_glut (freeglut)";
+#else
     io.BackendPlatformName ="imgui_impl_glut";
+#endif
 
     g_Time = 0;