gl: Add definitions for the core variant names of used GL constants

This allows us to use the core variant of the needed GL constants regardless of the
GL header version that is being used for compilation.

src/Makefile.sources

@@ -314,6 +314,7 @@ cairo_beos_cxx_sources = cairo-beos-surface.cpp
 cairo_gl_headers = cairo-gl.h
 cairo_gl_private = cairo-gl-private.h \
 		   cairo-gl-dispatch-private.h \
+		   cairo-gl-ext-def-private.h \
 		   cairo-gl-gradient-private.h \
 		   glew/GL/glew.h \
 		   glew/GL/glxew.h

src/cairo-gl-ext-def-private.h

@@ -0,0 +1,99 @@
+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright © 2010 Linaro Limited
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it either under the terms of the GNU Lesser General Public
+ * License version 2.1 as published by the Free Software Foundation
+ * (the "LGPL") or, at your option, under the terms of the Mozilla
+ * Public License Version 1.1 (the "MPL"). If you do not alter this
+ * notice, a recipient may use your version of this file under either
+ * the MPL or the LGPL.
+ *
+ * You should have received a copy of the LGPL along with this library
+ * in the file COPYING-LGPL-2.1; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+ * You should have received a copy of the MPL along with this library
+ * in the file COPYING-MPL-1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
+ * OF ANY KIND, either express or implied. See the LGPL or the MPL for
+ * the specific language governing rights and limitations.
+ *
+ * Contributor(s):
+ *      Alexandros Frantzis <alexandros.frantzis@linaro.org>
+ */
+
+#ifndef CAIRO_GL_EXT_DEF_PRIVATE_H
+#define CAIRO_GL_EXT_DEF_PRIVATE_H
+
+#ifndef GL_TEXTURE_RECTANGLE
+#define GL_TEXTURE_RECTANGLE 0x84F5
+#endif
+
+#ifndef GL_ARRAY_BUFFER
+#define GL_ARRAY_BUFFER 0x8892
+#endif
+
+#ifndef GL_STREAM_DRAW
+#define GL_STREAM_DRAW 0x88E0
+#endif
+
+#ifndef GL_WRITE_ONLY
+#define GL_WRITE_ONLY 0x88B9
+#endif
+
+#ifndef GL_PIXEL_UNPACK_BUFFER
+#define GL_PIXEL_UNPACK_BUFFER 0x88EC
+#endif
+
+#ifndef GL_FRAMEBUFFER
+#define GL_FRAMEBUFFER 0x8D40
+#endif
+
+#ifndef GL_COLOR_ATTACHMENT0
+#define GL_COLOR_ATTACHMENT0 0x8CE0
+#endif
+
+#ifndef GL_FRAMEBUFFER_COMPLETE
+#define GL_FRAMEBUFFER_COMPLETE 0x8CD5
+#endif
+
+#ifndef GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT
+#define GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT 0x8CD6
+#endif
+
+#ifndef GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT
+#define GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT 0x8CD7
+#endif
+
+#ifndef GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS
+#define GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS 0x8CD9
+#endif
+
+#ifndef GL_FRAMEBUFFER_INCOMPLETE_FORMATS
+#define GL_FRAMEBUFFER_INCOMPLETE_FORMATS 0x8CDA
+#endif
+
+#ifndef GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER
+#define GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER 0x8CDB
+#endif
+
+#ifndef GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER
+#define GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER 0x8CDC
+#endif
+
+#ifndef GL_FRAMEBUFFER_UNSUPPORTED
+#define GL_FRAMEBUFFER_UNSUPPORTED 0x8CDD
+#endif
+
+#ifndef GL_PACK_INVERT_MESA
+#define GL_PACK_INVERT_MESA 0x8758
+#endif
+
+#endif /* CAIRO_GL_EXT_DEF_PRIVATE_H */

src/cairo-gl-private.h

@@ -59,6 +59,7 @@
 #include <GL/gl.h>
 #define GL_GLEXT_PROTOTYPES
 #include <GL/glext.h>
+#include "cairo-gl-ext-def-private.h"
 
 #define DEBUG_GL 0