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diff --git a/glx/extension_string.c b/glx/extension_string.c
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+/*
+ * (C) Copyright IBM Corporation 2002-2006
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file extension_string.c
+ * Routines to manage the GLX extension string and GLX version for AIGLX
+ * drivers. This code is loosely based on src/glx/x11/glxextensions.c from
+ * Mesa.
+ *
+ * \author Ian Romanick <idr@us.ibm.com>
+ */
+
+#include <string.h>
+#include "extension_string.h"
+
+#define SET_BIT(m,b) (m[ (b) / 8 ] |= (1U << ((b) % 8)))
+#define CLR_BIT(m,b) (m[ (b) / 8 ] &= ~(1U << ((b) % 8)))
+#define IS_SET(m,b) ((m[ (b) / 8 ] & (1U << ((b) % 8))) != 0)
+#define CONCAT(a,b) a ## b
+#define GLX(n) "GLX_" # n, 4 + sizeof( # n ) - 1, CONCAT(n,_bit)
+#define VER(a,b) a, b
+#define Y 1
+#define N 0
+#define EXT_ENABLED(bit,supported) (IS_SET(supported, bit))
+
+struct extension_info {
+ const char * const name;
+ unsigned name_len;
+
+ unsigned char bit;
+
+ /**
+ * This is the lowest version of GLX that "requires" this extension.
+ * For example, GLX 1.3 requires SGIX_fbconfig, SGIX_pbuffer, and
+ * SGI_make_current_read. If the extension is not required by any known
+ * version of GLX, use 0, 0.
+ */
+ unsigned char version_major;
+ unsigned char version_minor;
+
+ /**
+ * Is driver support forced by the ABI?
+ */
+ unsigned char driver_support;
+};
+
+static const struct extension_info known_glx_extensions[] = {
+/* GLX_ARB_get_proc_address is implemented on the client. */
+ { GLX(ARB_multisample), VER(1,4), Y, },
+
+ { GLX(EXT_import_context), VER(0,0), Y, },
+ { GLX(EXT_texture_from_pixmap), VER(0,0), Y, },
+ { GLX(EXT_visual_info), VER(0,0), Y, },
+ { GLX(EXT_visual_rating), VER(0,0), Y, },
+
+ { GLX(MESA_copy_sub_buffer), VER(0,0), N, },
+ { GLX(OML_swap_method), VER(0,0), Y, },
+ { GLX(SGI_make_current_read), VER(1,3), N, },
+ { GLX(SGI_swap_control), VER(0,0), N, },
+ { GLX(SGIS_multisample), VER(0,0), Y, },
+ { GLX(SGIX_fbconfig), VER(1,3), Y, },
+ { GLX(SGIX_pbuffer), VER(1,3), N, },
+ { GLX(SGIX_visual_select_group), VER(0,0), Y, },
+ { NULL }
+};
+
+
+/**
+ * Create a GLX extension string for a set of enable bits.
+ *
+ * Creates a GLX extension string for the set of bit in \c enable_bits. This
+ * string is then stored in \c buffer if buffer is not \c NULL. This allows
+ * two-pass operation. On the first pass the caller passes \c NULL for
+ * \c buffer, and the function determines how much space is required to store
+ * the extension string. The caller allocates the buffer and calls the
+ * function again.
+ *
+ * \param enable_bits Bits representing the enabled extensions.
+ * \param buffer Buffer to store the extension string. May be \c NULL.
+ *
+ * \return
+ * The number of characters in \c buffer that were written to. If \c buffer
+ * is \c NULL, this is the size of buffer that must be allocated by the
+ * caller.
+ */
+int
+__glXGetExtensionString(const unsigned char *enable_bits, char *buffer)
+{
+ unsigned i;
+ int length = 0;
+
+
+ for (i = 0; known_glx_extensions[i].name != NULL; i++) {
+ const unsigned bit = known_glx_extensions[i].bit;
+ const size_t len = known_glx_extensions[i].name_len;
+
+ if (EXT_ENABLED(bit, enable_bits)) {
+ if (buffer != NULL) {
+ (void) memcpy(& buffer[length], known_glx_extensions[i].name,
+ len);
+
+ buffer[length + len + 0] = ' ';
+ buffer[length + len + 1] = '\0';
+ }
+
+ length += len + 1;
+ }
+ }
+
+ return length + 1;
+}
+
+
+void
+__glXEnableExtension(unsigned char *enable_bits, const char *ext)
+{
+ const size_t ext_name_len = strlen(ext);
+ unsigned i;
+
+
+ for (i = 0; known_glx_extensions[i].name != NULL; i++) {
+ if ((ext_name_len == known_glx_extensions[i].name_len)
+ && (memcmp(ext, known_glx_extensions[i].name, ext_name_len) == 0)) {
+ SET_BIT(enable_bits, known_glx_extensions[i].bit);
+ break;
+ }
+ }
+}
+
+
+void
+__glXInitExtensionEnableBits(unsigned char *enable_bits)
+{
+ unsigned i;
+
+
+ (void) memset(enable_bits, 0, __GLX_EXT_BYTES);
+
+ for (i = 0; known_glx_extensions[i].name != NULL; i++) {
+ if (known_glx_extensions[i].driver_support) {
+ SET_BIT(enable_bits, known_glx_extensions[i].bit);
+ }
+ }
+}