clarify glut defines

behdad · Nov 6, 2021 · b206726 · b206726
1 parent 93e6761
commit b206726
Showing 1 changed file with 15 additions and 0 deletions.
diff --git a/demo/demo-common.h b/demo/demo-common.h
@@ -45,9 +45,24 @@
 
 #ifdef HAVE_GLUT
     #if defined(__APPLE__)
+
+        // glut includes gl.h
+        // but we need gl3.h
+        // and including both gl.h and gl3.h produces conflict warnings
+        // so we define    __gl_h_    here so gl.h gets skipped
+        // since gl.h is ifdef guarded with  __gl_h_
+
         #define __gl_h_
+
+        // include glut
+
         #include <GLUT/glut.h>
+
+        // undefine   __gl_h_   after we include glut 
+        // incase it causes other problems 
+
         #undef __gl_h_
+
     #else
         #include <GL/glut.h>
     #endif