mesa xserver pixman git update 25 nov 2011

1 files changed, 384 insertions, 386 deletions

diff --git a/xorg-server/glx/single2.c b/xorg-server/glx/single2.c
index 4abd4c084..9f8254b01 100644
--- a/xorg-server/glx/single2.c
+++ b/xorg-server/glx/single2.c
@@ -1,386 +1,384 @@
-/*

- * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)

- * Copyright (C) 1991-2000 Silicon Graphics, Inc. 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

- * the rights to use, copy, modify, merge, publish, distribute, sublicense,

- * 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 including the dates of first publication and

- * either this permission notice or a reference to

- * http://oss.sgi.com/projects/FreeB/

- * 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 NONINFRINGEMENT. IN NO EVENT SHALL

- * SILICON GRAPHICS, INC. 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.

- *

- * Except as contained in this notice, the name of Silicon Graphics, Inc.

- * shall not be used in advertising or otherwise to promote the sale, use or

- * other dealings in this Software without prior written authorization from

- * Silicon Graphics, Inc.

- */

-

-#ifdef HAVE_DIX_CONFIG_H

-#include <dix-config.h>

-#endif

-

-#include <string.h>

-#include <stdio.h>

-#include <stdlib.h>

-

-#include "glxserver.h"

-#include "glxutil.h"

-#include "glxext.h"

-#include "indirect_dispatch.h"

-#include "unpack.h"

-#include "glapitable.h"

-#include "glapi.h"

-#include "glthread.h"

-#include "dispatch.h"

-

-int __glXDisp_FeedbackBuffer(__GLXclientState *cl, GLbyte *pc)

-{

-    GLsizei size;

-    GLenum type;

-    __GLXcontext *cx;

-    int error;

-

-    cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);

-    if (!cx) {

-	return error;

-    }

-

-    pc += __GLX_SINGLE_HDR_SIZE;

-    size = *(GLsizei *)(pc+0);

-    type = *(GLenum *)(pc+4);

-    if (cx->feedbackBufSize < size) {

-	cx->feedbackBuf = (GLfloat *) realloc(cx->feedbackBuf,

-						   (size_t)size 

-						   * __GLX_SIZE_FLOAT32);

-	if (!cx->feedbackBuf) {

-	    cl->client->errorValue = size;

-	    return BadAlloc;

-	}

-	cx->feedbackBufSize = size;

-    }

-    CALL_FeedbackBuffer( GET_DISPATCH(), (size, type, cx->feedbackBuf) );

-    cx->hasUnflushedCommands = GL_TRUE;

-    return Success;

-}

-

-int __glXDisp_SelectBuffer(__GLXclientState *cl, GLbyte *pc)

-{

-    __GLXcontext *cx;

-    GLsizei size;

-    int error;

-

-    cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);

-    if (!cx) {

-	return error;

-    }

-

-    pc += __GLX_SINGLE_HDR_SIZE;

-    size = *(GLsizei *)(pc+0);

-    if (cx->selectBufSize < size) {

-	cx->selectBuf = (GLuint *) realloc(cx->selectBuf,

-						(size_t) size 

-						* __GLX_SIZE_CARD32);

-	if (!cx->selectBuf) {

-	    cl->client->errorValue = size;

-	    return BadAlloc;

-	}

-	cx->selectBufSize = size;

-    }

-    CALL_SelectBuffer( GET_DISPATCH(), (size, cx->selectBuf) );

-    cx->hasUnflushedCommands = GL_TRUE;

-    return Success;

-}

-

-int __glXDisp_RenderMode(__GLXclientState *cl, GLbyte *pc)

-{

-    ClientPtr client;

-    xGLXRenderModeReply reply;

-    __GLXcontext *cx;

-    GLint nitems=0, retBytes=0, retval, newModeCheck;

-    GLubyte *retBuffer = NULL;

-    GLenum newMode;

-    int error;

-

-    cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);

-    if (!cx) {

-	return error;

-    }

-

-    pc += __GLX_SINGLE_HDR_SIZE;

-    newMode = *(GLenum*) pc;

-    retval = CALL_RenderMode( GET_DISPATCH(), (newMode) );

-

-    /* Check that render mode worked */

-    CALL_GetIntegerv( GET_DISPATCH(), (GL_RENDER_MODE, &newModeCheck) );

-    if (newModeCheck != newMode) {

-	/* Render mode change failed.  Bail */

-	newMode = newModeCheck;

-	goto noChangeAllowed;

-    }

-

-    /*

-    ** Render mode might have still failed if we get here.  But in this

-    ** case we can't really tell, nor does it matter.  If it did fail, it

-    ** will return 0, and thus we won't send any data across the wire.

-    */

-

-    switch (cx->renderMode) {

-      case GL_RENDER:

-	cx->renderMode = newMode;

-	break;

-      case GL_FEEDBACK:

-	if (retval < 0) {

-	    /* Overflow happened. Copy the entire buffer */

-	    nitems = cx->feedbackBufSize;

-	} else {

-	    nitems = retval;

-	}

-	retBytes = nitems * __GLX_SIZE_FLOAT32;

-	retBuffer = (GLubyte*) cx->feedbackBuf;

-	cx->renderMode = newMode;

-	break;

-      case GL_SELECT:

-	if (retval < 0) {

-	    /* Overflow happened.  Copy the entire buffer */

-	    nitems = cx->selectBufSize;

-	} else {

-	    GLuint *bp = cx->selectBuf;

-	    GLint i;

-

-	    /*

-	    ** Figure out how many bytes of data need to be sent.  Parse

-	    ** the selection buffer to determine this fact as the

-	    ** return value is the number of hits, not the number of

-	    ** items in the buffer.

-	    */

-	    nitems = 0;

-	    i = retval;

-	    while (--i >= 0) {

-		GLuint n;

-

-		/* Parse select data for this hit */

-		n = *bp;

-		bp += 3 + n;

-	    }

-	    nitems = bp - cx->selectBuf;

-	}

-	retBytes = nitems * __GLX_SIZE_CARD32;

-	retBuffer = (GLubyte*) cx->selectBuf;

-	cx->renderMode = newMode;

-	break;

-    }

-

-    /*

-    ** First reply is the number of elements returned in the feedback or

-    ** selection array, as per the API for glRenderMode itself.

-    */

-  noChangeAllowed:;

-    client = cl->client;

-    reply.length = nitems;

-    reply.type = X_Reply;

-    reply.sequenceNumber = client->sequence;

-    reply.retval = retval;

-    reply.size = nitems;

-    reply.newMode = newMode;

-    WriteToClient(client, sz_xGLXRenderModeReply, (char *)&reply);

-    if (retBytes) {

-	WriteToClient(client, retBytes, (char *)retBuffer);

-    }

-    return Success;

-}

-

-int __glXDisp_Flush(__GLXclientState *cl, GLbyte *pc)

-{

-	__GLXcontext *cx;

-	int error;

-

-	cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);

-	if (!cx) {

-		return error;

-	}

-

-	CALL_Flush( GET_DISPATCH(), () );

-	cx->hasUnflushedCommands = GL_FALSE;

-	return Success;

-}

-

-int __glXDisp_Finish(__GLXclientState *cl, GLbyte *pc)

-{

-    __GLXcontext *cx;

-    ClientPtr client;

-    int error;

-

-    cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);

-    if (!cx) {

-	return error;

-    }

-

-    /* Do a local glFinish */

-    CALL_Finish( GET_DISPATCH(), () );

-    cx->hasUnflushedCommands = GL_FALSE;

-

-    /* Send empty reply packet to indicate finish is finished */

-    client = cl->client;

-    __GLX_BEGIN_REPLY(0);

-    __GLX_SEND_HEADER();

-    return Success;

-}

-

-#define SEPARATOR " "

-

-char *__glXcombine_strings(const char *cext_string, const char *sext_string)

-{

-   size_t clen, slen;

-   char *combo_string, *token, *s1;

-   const char *s2, *end;

-

-   /* safeguard to prevent potentially fatal errors in the string functions */

-   if (!cext_string)

-      cext_string = "";

-   if (!sext_string)

-      sext_string = "";

-

-   /*

-   ** String can't be longer than min(cstring, sstring)

-   ** pull tokens out of shortest string

-   ** include space in combo_string for final separator and null terminator

-   */

-   clen = strlen(cext_string);

-   slen = strlen(sext_string);

-   if (clen > slen) {

-	combo_string = (char *) malloc(slen + 2);

-	s1 = (char *) malloc(slen + 2);

-	if (s1) strcpy(s1, sext_string);

-	s2 = cext_string;

-   } else {

-	combo_string = (char *) malloc(clen + 2);

-	s1 = (char *) malloc(clen + 2);

-	if (s1) strcpy(s1, cext_string);

-	s2 = sext_string;

-   }

-   if (!combo_string || !s1) {

-	free(combo_string);

-	free(s1);

-	return NULL;

-   }

-   combo_string[0] = '\0';

-

-   /* Get first extension token */

-   token = strtok( s1, SEPARATOR);

-   while ( token != NULL ) {

-

-	/*

-	** if token in second string then save it

-	** beware of extension names which are prefixes of other extension names

-	*/

-	const char *p = s2;

-	end = p + strlen(p);

-	while (p < end) {

-	    size_t n = strcspn(p, SEPARATOR);

-	    if ((strlen(token) == n) && (strncmp(token, p, n) == 0)) {

-		combo_string = strcat(combo_string, token);

-		combo_string = strcat(combo_string, SEPARATOR);

-	    }

-	    p += (n + 1);

-	}

-

-	/* Get next extension token */

-	token = strtok( NULL, SEPARATOR);

-   }

-   free(s1);

-   return combo_string;

-}

-

-int DoGetString(__GLXclientState *cl, GLbyte *pc, GLboolean need_swap)

-{

-    ClientPtr client;

-    __GLXcontext *cx;

-    GLenum name;

-    const char *string;

-    __GLX_DECLARE_SWAP_VARIABLES;

-    int error;

-    char *buf = NULL, *buf1 = NULL;

-    GLint length = 0;

-

-    /* If the client has the opposite byte order, swap the contextTag and

-     * the name.

-     */

-    if ( need_swap ) {

-	__GLX_SWAP_INT(pc + 4);

-	__GLX_SWAP_INT(pc + __GLX_SINGLE_HDR_SIZE);

-    }

-

-    cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);

-    if (!cx) {

-	return error;

-    }

-

-    pc += __GLX_SINGLE_HDR_SIZE;

-    name = *(GLenum *)(pc + 0);

-    string = (const char *) CALL_GetString( GET_DISPATCH(), (name) );

-    client = cl->client;

-

-    if (string == NULL)

-      string = "";

-

-    /*

-    ** Restrict extensions to those that are supported by both the

-    ** implementation and the connection.  That is, return the

-    ** intersection of client, server, and core extension strings.

-    */

-    if (name == GL_EXTENSIONS) {

-	buf1 = __glXcombine_strings(string,

-				      cl->GLClientextensions);

-	buf = __glXcombine_strings(buf1,

-				      cx->pGlxScreen->GLextensions);

-	free(buf1);

-	string = buf;

-    }

-    else if ( name == GL_VERSION ) {

-	if ( atof( string ) > atof( GLServerVersion ) ) {

-	    buf = malloc( strlen( string ) + strlen( GLServerVersion ) + 4 );

-	    if ( buf == NULL ) {

-		string = GLServerVersion;

-	    }

-	    else {

-		sprintf( buf, "%s (%s)", GLServerVersion, string );

-		string = buf;

-	    }

-	}

-    }

-    if (string) {

-	length = strlen((const char *) string) + 1;

-    }

-

-    __GLX_BEGIN_REPLY(length);

-    __GLX_PUT_SIZE(length);

-

-    if ( need_swap ) {

-	__GLX_SWAP_REPLY_SIZE();

-	__GLX_SWAP_REPLY_HEADER();

-    }

-

-    __GLX_SEND_HEADER();

-    WriteToClient(client, length, (char *) string); 

-    free(buf);

-

-    return Success;

-}

-

-int __glXDisp_GetString(__GLXclientState *cl, GLbyte *pc)

-{

-    return DoGetString(cl, pc, GL_FALSE);

-}

+/*
+ * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
+ * Copyright (C) 1991-2000 Silicon Graphics, Inc. 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
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * 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 including the dates of first publication and
+ * either this permission notice or a reference to
+ * http://oss.sgi.com/projects/FreeB/
+ * 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 NONINFRINGEMENT. IN NO EVENT SHALL
+ * SILICON GRAPHICS, INC. 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.
+ *
+ * Except as contained in this notice, the name of Silicon Graphics, Inc.
+ * shall not be used in advertising or otherwise to promote the sale, use or
+ * other dealings in this Software without prior written authorization from
+ * Silicon Graphics, Inc.
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "glxserver.h"
+#include "glxutil.h"
+#include "glxext.h"
+#include "indirect_dispatch.h"
+#include "unpack.h"
+#include "glapitable.h"
+#include "glapi.h"
+#include "glthread.h"
+#include "dispatch.h"
+
+int __glXDisp_FeedbackBuffer(__GLXclientState *cl, GLbyte *pc)
+{
+    GLsizei size;
+    GLenum type;
+    __GLXcontext *cx;
+    int error;
+
+    cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
+    if (!cx) {
+	return error;
+    }
+
+    pc += __GLX_SINGLE_HDR_SIZE;
+    size = *(GLsizei *)(pc+0);
+    type = *(GLenum *)(pc+4);
+    if (cx->feedbackBufSize < size) {
+	cx->feedbackBuf = (GLfloat *) realloc(cx->feedbackBuf,
+						   (size_t)size 
+						   * __GLX_SIZE_FLOAT32);
+	if (!cx->feedbackBuf) {
+	    cl->client->errorValue = size;
+	    return BadAlloc;
+	}
+	cx->feedbackBufSize = size;
+    }
+    CALL_FeedbackBuffer( GET_DISPATCH(), (size, type, cx->feedbackBuf) );
+    cx->hasUnflushedCommands = GL_TRUE;
+    return Success;
+}
+
+int __glXDisp_SelectBuffer(__GLXclientState *cl, GLbyte *pc)
+{
+    __GLXcontext *cx;
+    GLsizei size;
+    int error;
+
+    cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
+    if (!cx) {
+	return error;
+    }
+
+    pc += __GLX_SINGLE_HDR_SIZE;
+    size = *(GLsizei *)(pc+0);
+    if (cx->selectBufSize < size) {
+	cx->selectBuf = (GLuint *) realloc(cx->selectBuf,
+						(size_t) size 
+						* __GLX_SIZE_CARD32);
+	if (!cx->selectBuf) {
+	    cl->client->errorValue = size;
+	    return BadAlloc;
+	}
+	cx->selectBufSize = size;
+    }
+    CALL_SelectBuffer( GET_DISPATCH(), (size, cx->selectBuf) );
+    cx->hasUnflushedCommands = GL_TRUE;
+    return Success;
+}
+
+int __glXDisp_RenderMode(__GLXclientState *cl, GLbyte *pc)
+{
+    ClientPtr client;
+    xGLXRenderModeReply reply;
+    __GLXcontext *cx;
+    GLint nitems=0, retBytes=0, retval, newModeCheck;
+    GLubyte *retBuffer = NULL;
+    GLenum newMode;
+    int error;
+
+    cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
+    if (!cx) {
+	return error;
+    }
+
+    pc += __GLX_SINGLE_HDR_SIZE;
+    newMode = *(GLenum*) pc;
+    retval = CALL_RenderMode( GET_DISPATCH(), (newMode) );
+
+    /* Check that render mode worked */
+    CALL_GetIntegerv( GET_DISPATCH(), (GL_RENDER_MODE, &newModeCheck) );
+    if (newModeCheck != newMode) {
+	/* Render mode change failed.  Bail */
+	newMode = newModeCheck;
+	goto noChangeAllowed;
+    }
+
+    /*
+    ** Render mode might have still failed if we get here.  But in this
+    ** case we can't really tell, nor does it matter.  If it did fail, it
+    ** will return 0, and thus we won't send any data across the wire.
+    */
+
+    switch (cx->renderMode) {
+      case GL_RENDER:
+	cx->renderMode = newMode;
+	break;
+      case GL_FEEDBACK:
+	if (retval < 0) {
+	    /* Overflow happened. Copy the entire buffer */
+	    nitems = cx->feedbackBufSize;
+	} else {
+	    nitems = retval;
+	}
+	retBytes = nitems * __GLX_SIZE_FLOAT32;
+	retBuffer = (GLubyte*) cx->feedbackBuf;
+	cx->renderMode = newMode;
+	break;
+      case GL_SELECT:
+	if (retval < 0) {
+	    /* Overflow happened.  Copy the entire buffer */
+	    nitems = cx->selectBufSize;
+	} else {
+	    GLuint *bp = cx->selectBuf;
+	    GLint i;
+
+	    /*
+	    ** Figure out how many bytes of data need to be sent.  Parse
+	    ** the selection buffer to determine this fact as the
+	    ** return value is the number of hits, not the number of
+	    ** items in the buffer.
+	    */
+	    nitems = 0;
+	    i = retval;
+	    while (--i >= 0) {
+		GLuint n;
+
+		/* Parse select data for this hit */
+		n = *bp;
+		bp += 3 + n;
+	    }
+	    nitems = bp - cx->selectBuf;
+	}
+	retBytes = nitems * __GLX_SIZE_CARD32;
+	retBuffer = (GLubyte*) cx->selectBuf;
+	cx->renderMode = newMode;
+	break;
+    }
+
+    /*
+    ** First reply is the number of elements returned in the feedback or
+    ** selection array, as per the API for glRenderMode itself.
+    */
+  noChangeAllowed:;
+    client = cl->client;
+    reply.length = nitems;
+    reply.type = X_Reply;
+    reply.sequenceNumber = client->sequence;
+    reply.retval = retval;
+    reply.size = nitems;
+    reply.newMode = newMode;
+    WriteToClient(client, sz_xGLXRenderModeReply, (char *)&reply);
+    if (retBytes) {
+	WriteToClient(client, retBytes, (char *)retBuffer);
+    }
+    return Success;
+}
+
+int __glXDisp_Flush(__GLXclientState *cl, GLbyte *pc)
+{
+	__GLXcontext *cx;
+	int error;
+
+	cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
+	if (!cx) {
+		return error;
+	}
+
+	CALL_Flush( GET_DISPATCH(), () );
+	cx->hasUnflushedCommands = GL_FALSE;
+	return Success;
+}
+
+int __glXDisp_Finish(__GLXclientState *cl, GLbyte *pc)
+{
+    __GLXcontext *cx;
+    ClientPtr client;
+    int error;
+
+    cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
+    if (!cx) {
+	return error;
+    }
+
+    /* Do a local glFinish */
+    CALL_Finish( GET_DISPATCH(), () );
+    cx->hasUnflushedCommands = GL_FALSE;
+
+    /* Send empty reply packet to indicate finish is finished */
+    client = cl->client;
+    __GLX_BEGIN_REPLY(0);
+    __GLX_SEND_HEADER();
+    return Success;
+}
+
+#define SEPARATOR " "
+
+char *__glXcombine_strings(const char *cext_string, const char *sext_string)
+{
+   size_t clen, slen;
+   char *combo_string, *token, *s1;
+   const char *s2, *end;
+
+   /* safeguard to prevent potentially fatal errors in the string functions */
+   if (!cext_string)
+      cext_string = "";
+   if (!sext_string)
+      sext_string = "";
+
+   /*
+   ** String can't be longer than min(cstring, sstring)
+   ** pull tokens out of shortest string
+   ** include space in combo_string for final separator and null terminator
+   */
+   clen = strlen(cext_string);
+   slen = strlen(sext_string);
+   if (clen > slen) {
+	combo_string = (char *) malloc(slen + 2);
+	s1 = (char *) malloc(slen + 2);
+	if (s1) strcpy(s1, sext_string);
+	s2 = cext_string;
+   } else {
+	combo_string = (char *) malloc(clen + 2);
+	s1 = (char *) malloc(clen + 2);
+	if (s1) strcpy(s1, cext_string);
+	s2 = sext_string;
+   }
+   if (!combo_string || !s1) {
+	free(combo_string);
+	free(s1);
+	return NULL;
+   }
+   combo_string[0] = '\0';
+
+   /* Get first extension token */
+   token = strtok( s1, SEPARATOR);
+   while ( token != NULL ) {
+
+	/*
+	** if token in second string then save it
+	** beware of extension names which are prefixes of other extension names
+	*/
+	const char *p = s2;
+	end = p + strlen(p);
+	while (p < end) {
+	    size_t n = strcspn(p, SEPARATOR);
+	    if ((strlen(token) == n) && (strncmp(token, p, n) == 0)) {
+		combo_string = strcat(combo_string, token);
+		combo_string = strcat(combo_string, SEPARATOR);
+	    }
+	    p += (n + 1);
+	}
+
+	/* Get next extension token */
+	token = strtok( NULL, SEPARATOR);
+   }
+   free(s1);
+   return combo_string;
+}
+
+int DoGetString(__GLXclientState *cl, GLbyte *pc, GLboolean need_swap)
+{
+    ClientPtr client;
+    __GLXcontext *cx;
+    GLenum name;
+    const char *string;
+    __GLX_DECLARE_SWAP_VARIABLES;
+    int error;
+    char *buf = NULL, *buf1 = NULL;
+    GLint length = 0;
+
+    /* If the client has the opposite byte order, swap the contextTag and
+     * the name.
+     */
+    if ( need_swap ) {
+	__GLX_SWAP_INT(pc + 4);
+	__GLX_SWAP_INT(pc + __GLX_SINGLE_HDR_SIZE);
+    }
+
+    cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
+    if (!cx) {
+	return error;
+    }
+
+    pc += __GLX_SINGLE_HDR_SIZE;
+    name = *(GLenum *)(pc + 0);
+    string = (const char *) CALL_GetString( GET_DISPATCH(), (name) );
+    client = cl->client;
+
+    if (string == NULL)
+      string = "";
+
+    /*
+    ** Restrict extensions to those that are supported by both the
+    ** implementation and the connection.  That is, return the
+    ** intersection of client, server, and core extension strings.
+    */
+    if (name == GL_EXTENSIONS) {
+	buf1 = __glXcombine_strings(string,
+				      cl->GLClientextensions);
+	buf = __glXcombine_strings(buf1,
+				      cx->pGlxScreen->GLextensions);
+	free(buf1);
+	string = buf;
+    }
+    else if ( name == GL_VERSION ) {
+	if ( atof( string ) > atof( GLServerVersion ) ) {
+	    if ( asprintf( &buf, "%s (%s)", GLServerVersion, string ) == -1) {
+		string = GLServerVersion;
+	    }
+	    else {
+		string = buf;
+	    }
+	}
+    }
+    if (string) {
+	length = strlen((const char *) string) + 1;
+    }
+
+    __GLX_BEGIN_REPLY(length);
+    __GLX_PUT_SIZE(length);
+
+    if ( need_swap ) {
+	__GLX_SWAP_REPLY_SIZE();
+	__GLX_SWAP_REPLY_HEADER();
+    }
+
+    __GLX_SEND_HEADER();
+    WriteToClient(client, length, (char *) string); 
+    free(buf);
+
+    return Success;
+}
+
+int __glXDisp_GetString(__GLXclientState *cl, GLbyte *pc)
+{
+    return DoGetString(cl, pc, GL_FALSE);
+}