opt/glew/egl+glx.patch

--- a/src/glew.c
+++ b/src/glew.c
@@ -36,11 +36,13 @@
 #  include GLEW_INCLUDE
 #endif
 
+#if defined(GLEW_EGL)
+#  include <GL/eglew.h>
+#endif
+
 #if defined(GLEW_OSMESA)
 #  define GLAPI extern
 #  include <GL/osmesa.h>
-#elif defined(GLEW_EGL)
-#  include <GL/eglew.h>
 #elif defined(_WIN32)
 /*
  * If NOGDI is defined, wingdi.h won't be included by windows.h, and thus
@@ -57,8 +59,7 @@
 
 #include <stddef.h>  /* For size_t */
 
-#if defined(GLEW_EGL)
-#elif defined(GLEW_REGAL)
+#if defined(GLEW_REGAL)
 
 /* In GLEW_REGAL mode we call direcly into the linked
    libRegal.so glGetProcAddressREGAL for looking up
@@ -159,23 +160,37 @@
  * Define glewGetProcAddress.
  */
 #if defined(GLEW_REGAL)
-#  define glewGetProcAddress(name) regalGetProcAddress((const GLchar *)name)
+#  define _glewGetProcAddress(name) regalGetProcAddress((const GLchar *)name)
 #elif defined(GLEW_OSMESA)
-#  define glewGetProcAddress(name) OSMesaGetProcAddress((const char *)name)
-#elif defined(GLEW_EGL)
-#  define glewGetProcAddress(name) eglGetProcAddress((const char *)name)
+#  define _glewGetProcAddress(name) OSMesaGetProcAddress((const char *)name)
 #elif defined(_WIN32)
-#  define glewGetProcAddress(name) wglGetProcAddress((LPCSTR)name)
+#  define _glewGetProcAddress(name) wglGetProcAddress((LPCSTR)name)
 #elif defined(__APPLE__) && !defined(GLEW_APPLE_GLX)
-#  define glewGetProcAddress(name) NSGLGetProcAddress(name)
+#  define _glewGetProcAddress(name) NSGLGetProcAddress(name)
 #elif defined(__sgi) || defined(__sun) || defined(__HAIKU__)
-#  define glewGetProcAddress(name) dlGetProcAddress(name)
+#  define _glewGetProcAddress(name) dlGetProcAddress(name)
 #elif defined(__ANDROID__)
-#  define glewGetProcAddress(name) NULL /* TODO */
+#  define _glewGetProcAddress(name) NULL /* TODO */
 #elif defined(__native_client__)
-#  define glewGetProcAddress(name) NULL /* TODO */
+#  define _glewGetProcAddress(name) NULL /* TODO */
 #else /* __linux */
-#  define glewGetProcAddress(name) (*glXGetProcAddressARB)(name)
+#  define _glewGetProcAddress(name) (*glXGetProcAddressARB)(name)
+#endif
+
+#if defined(GLEW_EGL)
+static GLboolean _EGL_available = GL_FALSE;
+static void (*glewGetProcAddress (const GLubyte *name)) (void)
+{
+  void (*addr)(void);
+  if (_EGL_available)
+  {
+    addr = eglGetProcAddress((const char *)name);
+    if (addr) return addr;
+  }
+  return _glewGetProcAddress(name);
+}
+#else
+#  define glewGetProcAddress(name) _glewGetProcAddress(name)
 #endif
 
 /*
@@ -19297,9 +19312,7 @@
 }
 
 
-#if defined(GLEW_OSMESA)
-
-#elif defined(GLEW_EGL)
+#if defined(GLEW_EGL)
 
 PFNEGLCHOOSECONFIGPROC __eglewChooseConfig = NULL;
 PFNEGLCOPYBUFFERSPROC __eglewCopyBuffers = NULL;
@@ -20490,8 +20503,8 @@
   PFNEGLQUERYSTRINGPROC queryString = NULL;
 
   /* Load necessary entry points */
-  initialize = (PFNEGLINITIALIZEPROC)   glewGetProcAddress("eglInitialize");
-  queryString = (PFNEGLQUERYSTRINGPROC) glewGetProcAddress("eglQueryString");
+  initialize = (PFNEGLINITIALIZEPROC)   eglGetProcAddress("eglInitialize");
+  queryString = (PFNEGLQUERYSTRINGPROC) eglGetProcAddress("eglQueryString");
   if (!initialize || !queryString)
     return 1;
 
@@ -21029,7 +21042,9 @@
   return GLEW_OK;
 }
 
-#elif defined(_WIN32)
+#endif
+
+#if defined(_WIN32)
 
 PFNWGLSETSTEREOEMITTERSTATE3DLPROC __wglewSetStereoEmitterState3DL = NULL;
 
@@ -23105,13 +23120,26 @@
   GLenum r;
 #if defined(GLEW_EGL)
   PFNEGLGETCURRENTDISPLAYPROC getCurrentDisplay = NULL;
+  EGLDisplay display;
 #endif
   r = glewContextInit();
   if ( r != 0 ) return r;
 #if defined(GLEW_EGL)
-  getCurrentDisplay = (PFNEGLGETCURRENTDISPLAYPROC) glewGetProcAddress("eglGetCurrentDisplay");
-  return eglewInit(getCurrentDisplay());
-#elif defined(GLEW_OSMESA) || defined(__ANDROID__) || defined(__native_client__) || defined(__HAIKU__)
+  getCurrentDisplay = (PFNEGLGETCURRENTDISPLAYPROC) eglGetProcAddress("eglGetCurrentDisplay");
+  if (getCurrentDisplay)
+    display = getCurrentDisplay();
+  else
+    display = EGL_NO_DISPLAY;
+  if (display != EGL_NO_DISPLAY)
+  {
+    r = eglewInit(display);
+    if ( r == 0 ) {
+      _EGL_available = GL_TRUE;
+      return r;
+    }
+  }
+#endif
+#if defined(GLEW_OSMESA) || defined(__ANDROID__) || defined(__native_client__) || defined(__HAIKU__)
   return r;
 #elif defined(_WIN32)
   return wglewInit();
@@ -29785,7 +29813,7 @@
   return ret;
 }
 
-#if defined(_WIN32) && !defined(GLEW_EGL) && !defined(GLEW_OSMESA)
+#if defined(_WIN32) && !defined(GLEW_OSMESA)
 
 GLboolean GLEWAPIENTRY wglewIsSupported (const char* name)
 {
@@ -30228,7 +30256,7 @@
   return ret;
 }
 
-#elif !defined(GLEW_OSMESA) && !defined(GLEW_EGL) && !defined(__ANDROID__) && !defined(__native_client__) && !defined(__HAIKU__) && !defined(__APPLE__) || defined(GLEW_APPLE_GLX)
+#elif !defined(GLEW_OSMESA) && !defined(__ANDROID__) && !defined(__native_client__) && !defined(__HAIKU__) && !defined(__APPLE__) || defined(GLEW_APPLE_GLX)
 
 GLboolean glxewIsSupported (const char* name)
 {
@@ -30805,7 +30833,9 @@
   return ret;
 }
 
-#elif defined(GLEW_EGL)
+#endif
+
+#if defined(GLEW_EGL)
 
 GLboolean eglewIsSupported (const char* name)
 {