ephyr: Use GLEW.

This will hide all sorts of extension stuff from us.

configure.ac

@@ -2011,6 +2011,15 @@ if test "$KDRIVE" = yes; then
         AC_MSG_ERROR([Xephyr dependencies missing])
     fi
 
+    AC_CHECK_LIB(GLEW, glewInit, [
+      AC_CHECK_HEADER(GL/glew.h, [], [
+        AC_MSG_ERROR([requires glew http://glew.sourceforge.net/])
+      ])
+    ], [
+      AC_MSG_ERROR([requires glew http://glew.sourceforge.net/])
+    ])
+    XEPHYR_LIBS="$XEPHYR_LIBS -lGLEW"
+
     # Xephyr needs nanosleep() which is in librt on Solaris
     AC_CHECK_FUNC([nanosleep], [],
         AC_CHECK_LIB([rt], [nanosleep], XEPHYR_LIBS="$XEPHYR_LIBS -lrt"))

glamor/glamor.c

@@ -115,6 +115,8 @@ glamor_init(ScreenPtr screen)
     glamor_priv->saved_destroy_pixmap = screen->DestroyPixmap;
     screen->DestroyPixmap = glamor_destroy_pixmap;
 
+    glewInit();
+
     return TRUE;
 }
 

glamor/glamor_core.c

@@ -36,7 +36,6 @@
 #endif
 
 #include <stdlib.h>
-#include "GL/gl.h"
 
 #include "glamor_priv.h"
 

glamor/glamor_priv.h

@@ -29,6 +29,7 @@
 #define GLAMOR_PRIV_H
 
 #include "glamor.h"
+#include <GL/glew.h>
 
 typedef struct glamor_screen_private {
     CreateGCProcPtr saved_create_gc;