From c949a5984c43d35df7858c0825faf7f523e5e4c2 Mon Sep 17 00:00:00 2001
From: Mathieu Virbel <mat@kivy.org>
Date: Mon, 29 Oct 2012 15:17:06 +0100
Subject: [PATCH] glew: add more information about the GLEW initialization.
 refs #610

---
 kivy/graphics/gl_redirect.h |  1 +
 kivy/graphics/opengl.pyx    | 11 ++++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/kivy/graphics/gl_redirect.h b/kivy/graphics/gl_redirect.h
index 35db27dc5..62a7abf64 100644
--- a/kivy/graphics/gl_redirect.h
+++ b/kivy/graphics/gl_redirect.h
@@ -75,6 +75,7 @@ void glew_dynamic_binding() {
      */
     if (glGenFramebuffers == NULL) {
         printf("GL: glGenFramebuffers is NULL, try to detect an extension\n");
+        printf("GL: available extensions: %s\n", gl_extensions);
         if (strstr(gl_extensions, "ARB_framebuffer_object")) {
             printf("GL: ARB_framebuffer_object is supported\n");
 
diff --git a/kivy/graphics/opengl.pyx b/kivy/graphics/opengl.pyx
index 65526296c..883ba46c1 100644
--- a/kivy/graphics/opengl.pyx
+++ b/kivy/graphics/opengl.pyx
@@ -1570,9 +1570,18 @@ def glViewport(GLint x, GLint y, GLsizei width, GLsizei height):
 IF USE_GLEW:
     cdef extern from "gl_redirect.h":
         int glewInit()
+        int GLEW_OK
+        char *glewGetErrorString(int)
         void glew_dynamic_binding()
     def gl_init_symbols():
-        glewInit()
+        cdef int result
+        cdef bytes error
+        result = glewInit()
+        if result != GLEW_OK:
+            error = glewGetErrorString(result)
+            print 'GLEW initialization error:', error
+        else:
+            print 'GLEW initialization succeeded'
         glew_dynamic_binding()
 
 ELSE: