From 2980071f73776ba36b42f4b3c5304bbe38aecddd Mon Sep 17 00:00:00 2001
From: Krishna Vedala <7001608+kvedala@users.noreply.github.com>
Date: Tue, 7 Jul 2020 10:08:15 -0400
Subject: [PATCH] use the macro USE_GLUT

---
 graphics/CMakeLists.txt | 3 +--
 graphics/spirograph.cpp | 6 ++++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/graphics/CMakeLists.txt b/graphics/CMakeLists.txt
index f07dfc52a..ecf21e2a6 100644
--- a/graphics/CMakeLists.txt
+++ b/graphics/CMakeLists.txt
@@ -50,8 +50,7 @@ foreach( testsourcefile ${APP_SOURCES} )
             target_include_directories(${testname} PRIVATE ${GLUT_INCLUDE_DIRS})
             target_link_libraries(${testname} PRIVATE OpenGL::GL ${GLUT_LIBRARIES})
         endif()
-    else(OpenGL_FOUND)
-        target_compile_definitions(${testname} PRIVATE NO_OPENGL)
+        target_compile_definitions(${testname} PRIVATE USE_GLUT)
     endif(OpenGL_FOUND)
     
     if(APPLE)
diff --git a/graphics/spirograph.cpp b/graphics/spirograph.cpp
index 52cf50963..f4b526ac5 100644
--- a/graphics/spirograph.cpp
+++ b/graphics/spirograph.cpp
@@ -25,11 +25,13 @@
 #ifdef _OPENMP
 #include <omp.h>
 #endif
+#ifdef USE_GLUT
 #ifdef __APPLE__
 #include <GLUT/glut.h>  // include path on Macs is different
 #else
 #include <GL/glut.h>
 #endif  // __APPLE__
+#endif
 
 /**
  * @namespace spirograph Functions related to spirograph.cpp
@@ -112,7 +114,7 @@ void test() {
     fp.close();
 }
 
-#ifndef NO_OPENGL
+#ifdef USE_GLUT
 /** A wrapper that is not available in all GLUT implementations.
  */
 static inline void glutBitmapString(void *font, char *message) {
@@ -219,7 +221,7 @@ void timer_cb(int t) {
 int main(int argc, char **argv) {
     spirograph::test();
 
-#ifndef NO_OPENGL
+#ifdef USE_GLUT
     glutInit(&argc, argv);
     glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
     glutCreateWindow("Spirograph");