From 9b7f020ed35ebb0711ceb633aa8accbb0512ffe2 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Thu, 4 Apr 2019 18:42:45 +0200
Subject: Update procedure for OpenGL3 support.

---
 examples/OpenGL3test.cxx | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'examples')

diff --git a/examples/OpenGL3test.cxx b/examples/OpenGL3test.cxx
index ca880d22f..b8fe670d5 100644
--- a/examples/OpenGL3test.cxx
+++ b/examples/OpenGL3test.cxx
@@ -49,6 +49,7 @@ public:
   SimpleGL3Window(int x, int y, int w, int h) :  Fl_Gl_Window(x, y, w, h) {
     mode(FL_RGB8 | FL_DOUBLE | FL_OPENGL3);
     shaderProgram = 0;
+    gl_version_major = 0;
   }
   void draw(void) {
     if (gl_version_major < 3) return;
@@ -154,6 +155,7 @@ public:
       add_output("GL_VERSION=%s\n", glv);
       sscanf((const char *)glv, "%d", &gl_version_major);
       if (gl_version_major < 3) add_output("\nThis platform does not support OpenGL V3\n\n");
+      redraw();
     }
     
     if (event == FL_PUSH && gl_version_major >= 3) {
-- 
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