xserver git update 15/5/2010

1 files changed, 610 insertions, 610 deletions

diff --git a/xorg-server/glx/glxext.c b/xorg-server/glx/glxext.c
index 89e58b0b0..349b0f983 100644
--- a/xorg-server/glx/glxext.c
+++ b/xorg-server/glx/glxext.c
@@ -1,610 +1,610 @@
-/*
- * 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 "glxserver.h"
-#include <windowstr.h>
-#include <propertyst.h>
-#include <registry.h>
-#include "privates.h"
-#include <os.h>
-#include "g_disptab.h"
-#include "unpack.h"
-#include "glxutil.h"
-#include "glxext.h"
-#include "indirect_table.h"
-#include "indirect_util.h"
-
-/*
-** The last context used by the server.  It is the context that is current
-** from the server's perspective.
-*/
-__GLXcontext *__glXLastContext;
-__GLXcontext *__glXContextList;
-
-/*
-** X resources.
-*/
-RESTYPE __glXContextRes;
-RESTYPE __glXDrawableRes;
-RESTYPE __glXSwapBarrierRes;
-
-/*
-** Reply for most singles.
-*/
-xGLXSingleReply __glXReply;
-
-static int glxClientPrivateKeyIndex;
-static DevPrivateKey glxClientPrivateKey = &glxClientPrivateKeyIndex;
-
-/*
-** Client that called into GLX dispatch.
-*/
-ClientPtr __pGlxClient;
-
-/*
-** Forward declarations.
-*/
-static int __glXDispatch(ClientPtr);
-
-/*
-** Called when the extension is reset.
-*/
-static void ResetExtension(ExtensionEntry* extEntry)
-{
-    __glXFlushContextCache();
-}
-
-/*
-** Reset state used to keep track of large (multi-request) commands.
-*/
-void __glXResetLargeCommandStatus(__GLXclientState *cl)
-{
-    cl->largeCmdBytesSoFar = 0;
-    cl->largeCmdBytesTotal = 0;
-    cl->largeCmdRequestsSoFar = 0;
-    cl->largeCmdRequestsTotal = 0;
-}
-
-/*
-** This procedure is called when the client who created the context goes
-** away OR when glXDestroyContext is called.  In either case, all we do is
-** flag that the ID is no longer valid, and (maybe) free the context.
-** use.
-*/
-static int ContextGone(__GLXcontext* cx, XID id)
-{
-    cx->idExists = GL_FALSE;
-    if (!cx->isCurrent) {
-	__glXFreeContext(cx);
-    }
-
-    return True;
-}
-
-static __GLXcontext *glxPendingDestroyContexts;
-static __GLXcontext *glxAllContexts;
-static int glxServerLeaveCount;
-static int glxBlockClients;
-
-/*
-** Destroy routine that gets called when a drawable is freed.  A drawable
-** contains the ancillary buffers needed for rendering.
-*/
-static Bool DrawableGone(__GLXdrawable *glxPriv, XID xid)
-{
-    __GLXcontext *c;
-
-    /* If this drawable was created using glx 1.3 drawable
-     * constructors, we added it as a glx drawable resource under both
-     * its glx drawable ID and it X drawable ID.  Remove the other
-     * resource now so we don't a callback for freed memory. */
-    if (glxPriv->drawId != glxPriv->pDraw->id) {
-	if (xid == glxPriv->drawId)
-	    FreeResourceByType(glxPriv->pDraw->id, __glXDrawableRes, TRUE);
-	else
-	    FreeResourceByType(glxPriv->drawId, __glXDrawableRes, TRUE);
-    }
-
-    for (c = glxAllContexts; c; c = c->next) {
-	if (c->isCurrent && (c->drawPriv == glxPriv || c->readPriv == glxPriv)) {
-	    int i;
-
-	    (*c->loseCurrent)(c);
-	    c->isCurrent = GL_FALSE;
-	    if (c == __glXLastContext)
-		__glXFlushContextCache();
-
-	    for (i = 1; i < currentMaxClients; i++) {
-		if (clients[i]) {
-		    __GLXclientState *cl = glxGetClient(clients[i]);
-
-		    if (cl->inUse) {
-			int j;
-
-			for (j = 0; j < cl->numCurrentContexts; j++) {
-			    if (cl->currentContexts[j] == c)
-				cl->currentContexts[j] = NULL;
-			}
-		    }
-		}
-	    }
-
-	    if (!c->idExists) {
-		__glXFreeContext(c);
-	    }
-	}
-	if (c->drawPriv == glxPriv)
-	    c->drawPriv = NULL;
-	if (c->readPriv == glxPriv)
-	    c->readPriv = NULL;
-    }
-
-    glxPriv->destroy(glxPriv);
-
-    return True;
-}
-
-void __glXAddToContextList(__GLXcontext *cx)
-{
-    cx->next = glxAllContexts;
-    glxAllContexts = cx;
-}
-
-static void __glXRemoveFromContextList(__GLXcontext *cx)
-{
-    __GLXcontext *c, *prev;
-
-    if (cx == glxAllContexts)
-	glxAllContexts = cx->next;
-    else {
-	prev = glxAllContexts;
-	for (c = glxAllContexts; c; c = c->next) {
-	    if (c == cx)
-		prev->next = c->next;
-	    prev = c;
-	}
-    }
-}
-
-/*
-** Free a context.
-*/
-GLboolean __glXFreeContext(__GLXcontext *cx)
-{
-    if (cx->idExists || cx->isCurrent) return GL_FALSE;
-    
-    if (cx->feedbackBuf) xfree(cx->feedbackBuf);
-    if (cx->selectBuf) xfree(cx->selectBuf);
-    if (cx == __glXLastContext) {
-	__glXFlushContextCache();
-    }
-
-    __glXRemoveFromContextList(cx);
-
-    /* We can get here through both regular dispatching from
-     * __glXDispatch() or as a callback from the resource manager.  In
-     * the latter case we need to lift the DRI lock manually. */
-
-    if (!glxBlockClients) {
-	__glXleaveServer(GL_FALSE);
-	cx->destroy(cx);
-	__glXenterServer(GL_FALSE);
-    } else {
-	cx->next = glxPendingDestroyContexts;
-	glxPendingDestroyContexts = cx;
-    }
-
-    return GL_TRUE;
-}
-
-extern RESTYPE __glXSwapBarrierRes;
-
-static int SwapBarrierGone(int screen, XID drawable)
-{
-    __GLXscreen *pGlxScreen = glxGetScreen(screenInfo.screens[screen]);
-
-    if (pGlxScreen->swapBarrierFuncs) {
-        pGlxScreen->swapBarrierFuncs->bindSwapBarrierFunc(screen, drawable, 0);
-    }
-    FreeResourceByType(drawable, __glXSwapBarrierRes, FALSE);
-    return True;
-}
-
-/************************************************************************/
-
-/*
-** These routines can be used to check whether a particular GL command
-** has caused an error.  Specifically, we use them to check whether a
-** given query has caused an error, in which case a zero-length data
-** reply is sent to the client.
-*/
-
-static GLboolean errorOccured = GL_FALSE;
-
-/*
-** The GL was will call this routine if an error occurs.
-*/
-void __glXErrorCallBack(GLenum code)
-{
-    errorOccured = GL_TRUE;
-}
-
-/*
-** Clear the error flag before calling the GL command.
-*/
-void __glXClearErrorOccured(void)
-{
-    errorOccured = GL_FALSE;
-}
-
-/*
-** Check if the GL command caused an error.
-*/
-GLboolean __glXErrorOccured(void)
-{
-    return errorOccured;
-}
-
-static int __glXErrorBase;
-int __glXEventBase;
-
-int __glXError(int error)
-{
-    return __glXErrorBase + error;
-}
-
-__GLXclientState *
-glxGetClient(ClientPtr pClient)
-{
-    return dixLookupPrivate(&pClient->devPrivates, glxClientPrivateKey);
-}
-
-static void
-glxClientCallback (CallbackListPtr	*list,
-		   pointer		closure,
-		   pointer		data)
-{
-    NewClientInfoRec	*clientinfo = (NewClientInfoRec *) data;
-    ClientPtr		pClient = clientinfo->client;
-    __GLXclientState	*cl = glxGetClient(pClient);
-    __GLXcontext	*cx;
-    int i;
-
-    switch (pClient->clientState) {
-    case ClientStateRunning:
-	/*
-	** By default, assume that the client supports
-	** GLX major version 1 minor version 0 protocol.
-	*/
-	cl->GLClientmajorVersion = 1;
-	cl->GLClientminorVersion = 0;
-	cl->client = pClient;
-	break;
-
-    case ClientStateGone:
-	for (i = 0; i < cl->numCurrentContexts; i++) {
-	    cx = cl->currentContexts[i];
-	    if (cx) {
-		cx->isCurrent = GL_FALSE;
-		if (!cx->idExists)
-		    __glXFreeContext(cx);
-	    }
-	}
-
-	if (cl->returnBuf) xfree(cl->returnBuf);
-	if (cl->largeCmdBuf) xfree(cl->largeCmdBuf);
-	if (cl->currentContexts) xfree(cl->currentContexts);
-	if (cl->GLClientextensions) xfree(cl->GLClientextensions);
-	break;
-
-    default:
-	break;
-    }
-}
-
-/************************************************************************/
-
-static __GLXprovider *__glXProviderStack;
-
-void GlxPushProvider(__GLXprovider *provider)
-{
-    provider->next = __glXProviderStack;
-    __glXProviderStack = provider;
-}
-
-/*
-** Initialize the GLX extension.
-*/
-void GlxExtensionInit(void)
-{
-    ExtensionEntry *extEntry;
-    ScreenPtr pScreen;
-    int i;
-    __GLXprovider *p;
-    Bool glx_provided = False;
-
-    __glXContextRes = CreateNewResourceType((DeleteType)ContextGone,
-					    "GLXContext");
-    __glXDrawableRes = CreateNewResourceType((DeleteType)DrawableGone,
-					     "GLXDrawable");
-    __glXSwapBarrierRes = CreateNewResourceType((DeleteType)SwapBarrierGone,
-						"GLXSwapBarrier");
-    if (!__glXContextRes || !__glXDrawableRes || !__glXSwapBarrierRes)
-	return;
-
-    if (!dixRequestPrivate(glxClientPrivateKey, sizeof (__GLXclientState)))
-	return;
-    if (!AddCallback (&ClientStateCallback, glxClientCallback, 0))
-	return;
-
-    for (i = 0; i < screenInfo.numScreens; i++) {
-	pScreen = screenInfo.screens[i];
-
-	for (p = __glXProviderStack; p != NULL; p = p->next) {
-	    __GLXscreen *glxScreen;
-
-	    glxScreen = p->screenProbe(pScreen);
-	    if (glxScreen != NULL) {
-	        if (glxScreen->GLXminor < glxMinorVersion)
-		    glxMinorVersion = glxScreen->GLXminor;
-		LogMessage(X_INFO,
-			   "GLX: Initialized %s GL provider for screen %d\n",
-			   p->name, i);
-		break;
-	    }
-
-	}
-
-	if (!p)
-	    LogMessage(X_INFO,
-		       "GLX: no usable GL providers found for screen %d\n", i);
-	else
-	    glx_provided = True;
-    }
-
-    /* don't register extension if GL is not provided on any screen */
-    if (!glx_provided)
-	return;
-
-    /*
-    ** Add extension to server extensions.
-    */
-    extEntry = AddExtension(GLX_EXTENSION_NAME, __GLX_NUMBER_EVENTS,
-			    __GLX_NUMBER_ERRORS, __glXDispatch,
-			    __glXDispatch, ResetExtension,
-			    StandardMinorOpcode);
-    if (!extEntry) {
-	FatalError("__glXExtensionInit: AddExtensions failed\n");
-	return;
-    }
-    if (!AddExtensionAlias(GLX_EXTENSION_ALIAS, extEntry)) {
-	ErrorF("__glXExtensionInit: AddExtensionAlias failed\n");
-	return;
-    }
-
-    __glXErrorBase = extEntry->errorBase;
-    __glXEventBase = extEntry->eventBase;
-}
-
-/************************************************************************/
-
-void __glXFlushContextCache(void)
-{
-    __glXLastContext = 0;
-}
-
-/*
-** Make a context the current one for the GL (in this implementation, there
-** is only one instance of the GL, and we use it to serve all GL clients by
-** switching it between different contexts).  While we are at it, look up
-** a context by its tag and return its (__GLXcontext *).
-*/
-__GLXcontext *__glXForceCurrent(__GLXclientState *cl, GLXContextTag tag,
-				int *error)
-{
-    __GLXcontext *cx;
-
-    /*
-    ** See if the context tag is legal; it is managed by the extension,
-    ** so if it's invalid, we have an implementation error.
-    */
-    cx = (__GLXcontext *) __glXLookupContextByTag(cl, tag);
-    if (!cx) {
-	cl->client->errorValue = tag;
-	*error = __glXError(GLXBadContextTag);
-	return 0;
-    }
-
-    if (!cx->isDirect) {
-	if (cx->drawPriv == NULL) {
-	    /*
-	    ** The drawable has vanished.  It must be a window, because only
-	    ** windows can be destroyed from under us; GLX pixmaps are
-	    ** refcounted and don't go away until no one is using them.
-	    */
-	    *error = __glXError(GLXBadCurrentWindow);
-	    return 0;
-    	}
-    }
-    
-    if (cx->wait && (*cx->wait)(cx, cl, error))
-	return NULL;
-
-    if (cx == __glXLastContext) {
-	/* No need to re-bind */
-	return cx;
-    }
-
-    /* Make this context the current one for the GL. */
-    if (!cx->isDirect) {
-	if (!(*cx->forceCurrent)(cx)) {
-	    /* Bind failed, and set the error code.  Bummer */
-	    cl->client->errorValue = cx->id;
-	    *error = __glXError(GLXBadContextState);
-	    return 0;
-    	}
-    }
-    __glXLastContext = cx;
-    return cx;
-}
-
-/************************************************************************/
-
-void glxSuspendClients(void)
-{
-    int i;
-
-    for (i = 1; i < currentMaxClients; i++) {
-	if (clients[i] && glxGetClient(clients[i])->inUse)
-	    IgnoreClient(clients[i]);
-    }
-
-    glxBlockClients = TRUE;
-}
-
-void glxResumeClients(void)
-{
-    __GLXcontext *cx, *next;
-    int i;
-
-    glxBlockClients = FALSE;
-
-    for (i = 1; i < currentMaxClients; i++) {
-	if (clients[i] && glxGetClient(clients[i])->inUse)
-	    AttendClient(clients[i]);
-    }
-
-    __glXleaveServer(GL_FALSE);
-    for (cx = glxPendingDestroyContexts; cx != NULL; cx = next) {
-	next = cx->next;
-
-	cx->destroy(cx);
-    }
-    glxPendingDestroyContexts = NULL;
-    __glXenterServer(GL_FALSE);
-}
-
-static void
-__glXnopEnterServer(GLboolean rendering)
-{
-}
-    
-static void
-__glXnopLeaveServer(GLboolean rendering)
-{
-}
-
-static void (*__glXenterServerFunc)(GLboolean) = __glXnopEnterServer;
-static void (*__glXleaveServerFunc)(GLboolean)  = __glXnopLeaveServer;
-
-void __glXsetEnterLeaveServerFuncs(void (*enter)(GLboolean),
-				   void (*leave)(GLboolean))
-{
-  __glXenterServerFunc = enter;
-  __glXleaveServerFunc = leave;
-}
-
-
-void __glXenterServer(GLboolean rendering)
-{
-  glxServerLeaveCount--;
-
-  if (glxServerLeaveCount == 0)
-    (*__glXenterServerFunc)(rendering);
-}
-
-void __glXleaveServer(GLboolean rendering)
-{
-  if (glxServerLeaveCount == 0)
-    (*__glXleaveServerFunc)(rendering);
-
-  glxServerLeaveCount++;
-}
-
-/*
-** Top level dispatcher; all commands are executed from here down.
-*/
-static int __glXDispatch(ClientPtr client)
-{
-    REQUEST(xGLXSingleReq);
-    CARD8 opcode;
-    __GLXdispatchSingleProcPtr proc;
-    __GLXclientState *cl;
-    int retval;
-
-    opcode = stuff->glxCode;
-    cl = glxGetClient(client);
-    /* Mark it in use so we suspend it on VT switch. */
-    cl->inUse = TRUE;
-
-    /*
-    ** If we're expecting a glXRenderLarge request, this better be one.
-    */
-    if ((cl->largeCmdRequestsSoFar != 0) && (opcode != X_GLXRenderLarge)) {
-	client->errorValue = stuff->glxCode;
-	return __glXError(GLXBadLargeRequest);
-    }
-
-    /* If we're currently blocking GLX clients, just put this guy to
-     * sleep, reset the request and return. */
-    if (glxBlockClients) {
-	ResetCurrentRequest(client);
-	client->sequence--;
-	IgnoreClient(client);
-	return(client->noClientException);
-    }
-
-    /*
-    ** Use the opcode to index into the procedure table.
-    */
-    proc = (__GLXdispatchSingleProcPtr) __glXGetProtocolDecodeFunction(& Single_dispatch_info,
-								       opcode,
-								       client->swapped);
-    if (proc != NULL) {
-	GLboolean rendering = opcode <= X_GLXRenderLarge;
-	__glXleaveServer(rendering);
-
-	__pGlxClient = client;
-
-	retval = (*proc)(cl, (GLbyte *) stuff);
-
-	__glXenterServer(rendering);
-    }
-    else {
-	retval = BadRequest;
-    }
-
-    return retval;
-}
+/*

+ * 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 "glxserver.h"

+#include <windowstr.h>

+#include <propertyst.h>

+#include <registry.h>

+#include "privates.h"

+#include <os.h>

+#include "g_disptab.h"

+#include "unpack.h"

+#include "glxutil.h"

+#include "glxext.h"

+#include "indirect_table.h"

+#include "indirect_util.h"

+

+/*

+** The last context used by the server.  It is the context that is current

+** from the server's perspective.

+*/

+__GLXcontext *__glXLastContext;

+__GLXcontext *__glXContextList;

+

+/*

+** X resources.

+*/

+RESTYPE __glXContextRes;

+RESTYPE __glXDrawableRes;

+RESTYPE __glXSwapBarrierRes;

+

+/*

+** Reply for most singles.

+*/

+xGLXSingleReply __glXReply;

+

+static int glxClientPrivateKeyIndex;

+static DevPrivateKey glxClientPrivateKey = &glxClientPrivateKeyIndex;

+

+/*

+** Client that called into GLX dispatch.

+*/

+ClientPtr __pGlxClient;

+

+/*

+** Forward declarations.

+*/

+static int __glXDispatch(ClientPtr);

+

+/*

+** Called when the extension is reset.

+*/

+static void ResetExtension(ExtensionEntry* extEntry)

+{

+    __glXFlushContextCache();

+}

+

+/*

+** Reset state used to keep track of large (multi-request) commands.

+*/

+void __glXResetLargeCommandStatus(__GLXclientState *cl)

+{

+    cl->largeCmdBytesSoFar = 0;

+    cl->largeCmdBytesTotal = 0;

+    cl->largeCmdRequestsSoFar = 0;

+    cl->largeCmdRequestsTotal = 0;

+}

+

+/*

+** This procedure is called when the client who created the context goes

+** away OR when glXDestroyContext is called.  In either case, all we do is

+** flag that the ID is no longer valid, and (maybe) free the context.

+** use.

+*/

+static int ContextGone(__GLXcontext* cx, XID id)

+{

+    cx->idExists = GL_FALSE;

+    if (!cx->isCurrent) {

+	__glXFreeContext(cx);

+    }

+

+    return True;

+}

+

+static __GLXcontext *glxPendingDestroyContexts;

+static __GLXcontext *glxAllContexts;

+static int glxServerLeaveCount;

+static int glxBlockClients;

+

+/*

+** Destroy routine that gets called when a drawable is freed.  A drawable

+** contains the ancillary buffers needed for rendering.

+*/

+static Bool DrawableGone(__GLXdrawable *glxPriv, XID xid)

+{

+    __GLXcontext *c;

+

+    /* If this drawable was created using glx 1.3 drawable

+     * constructors, we added it as a glx drawable resource under both

+     * its glx drawable ID and it X drawable ID.  Remove the other

+     * resource now so we don't a callback for freed memory. */

+    if (glxPriv->drawId != glxPriv->pDraw->id) {

+	if (xid == glxPriv->drawId)

+	    FreeResourceByType(glxPriv->pDraw->id, __glXDrawableRes, TRUE);

+	else

+	    FreeResourceByType(glxPriv->drawId, __glXDrawableRes, TRUE);

+    }

+

+    for (c = glxAllContexts; c; c = c->next) {

+	if (c->isCurrent && (c->drawPriv == glxPriv || c->readPriv == glxPriv)) {

+	    int i;

+

+	    (*c->loseCurrent)(c);

+	    c->isCurrent = GL_FALSE;

+	    if (c == __glXLastContext)

+		__glXFlushContextCache();

+

+	    for (i = 1; i < currentMaxClients; i++) {

+		if (clients[i]) {

+		    __GLXclientState *cl = glxGetClient(clients[i]);

+

+		    if (cl->inUse) {

+			int j;

+

+			for (j = 0; j < cl->numCurrentContexts; j++) {

+			    if (cl->currentContexts[j] == c)

+				cl->currentContexts[j] = NULL;

+			}

+		    }

+		}

+	    }

+

+	    if (!c->idExists) {

+		__glXFreeContext(c);

+	    }

+	}

+	if (c->drawPriv == glxPriv)

+	    c->drawPriv = NULL;

+	if (c->readPriv == glxPriv)

+	    c->readPriv = NULL;

+    }

+

+    glxPriv->destroy(glxPriv);

+

+    return True;

+}

+

+void __glXAddToContextList(__GLXcontext *cx)

+{

+    cx->next = glxAllContexts;

+    glxAllContexts = cx;

+}

+

+static void __glXRemoveFromContextList(__GLXcontext *cx)

+{

+    __GLXcontext *c, *prev;

+

+    if (cx == glxAllContexts)

+	glxAllContexts = cx->next;

+    else {

+	prev = glxAllContexts;

+	for (c = glxAllContexts; c; c = c->next) {

+	    if (c == cx)

+		prev->next = c->next;

+	    prev = c;

+	}

+    }

+}

+

+/*

+** Free a context.

+*/

+GLboolean __glXFreeContext(__GLXcontext *cx)

+{

+    if (cx->idExists || cx->isCurrent) return GL_FALSE;

+    

+    if (cx->feedbackBuf) free(cx->feedbackBuf);

+    if (cx->selectBuf) free(cx->selectBuf);

+    if (cx == __glXLastContext) {

+	__glXFlushContextCache();

+    }

+

+    __glXRemoveFromContextList(cx);

+

+    /* We can get here through both regular dispatching from

+     * __glXDispatch() or as a callback from the resource manager.  In

+     * the latter case we need to lift the DRI lock manually. */

+

+    if (!glxBlockClients) {

+	__glXleaveServer(GL_FALSE);

+	cx->destroy(cx);

+	__glXenterServer(GL_FALSE);

+    } else {

+	cx->next = glxPendingDestroyContexts;

+	glxPendingDestroyContexts = cx;

+    }

+

+    return GL_TRUE;

+}

+

+extern RESTYPE __glXSwapBarrierRes;

+

+static int SwapBarrierGone(int screen, XID drawable)

+{

+    __GLXscreen *pGlxScreen = glxGetScreen(screenInfo.screens[screen]);

+

+    if (pGlxScreen->swapBarrierFuncs) {

+        pGlxScreen->swapBarrierFuncs->bindSwapBarrierFunc(screen, drawable, 0);

+    }

+    FreeResourceByType(drawable, __glXSwapBarrierRes, FALSE);

+    return True;

+}

+

+/************************************************************************/

+

+/*

+** These routines can be used to check whether a particular GL command

+** has caused an error.  Specifically, we use them to check whether a

+** given query has caused an error, in which case a zero-length data

+** reply is sent to the client.

+*/

+

+static GLboolean errorOccured = GL_FALSE;

+

+/*

+** The GL was will call this routine if an error occurs.

+*/

+void __glXErrorCallBack(GLenum code)

+{

+    errorOccured = GL_TRUE;

+}

+

+/*

+** Clear the error flag before calling the GL command.

+*/

+void __glXClearErrorOccured(void)

+{

+    errorOccured = GL_FALSE;

+}

+

+/*

+** Check if the GL command caused an error.

+*/

+GLboolean __glXErrorOccured(void)

+{

+    return errorOccured;

+}

+

+static int __glXErrorBase;

+int __glXEventBase;

+

+int __glXError(int error)

+{

+    return __glXErrorBase + error;

+}

+

+__GLXclientState *

+glxGetClient(ClientPtr pClient)

+{

+    return dixLookupPrivate(&pClient->devPrivates, glxClientPrivateKey);

+}

+

+static void

+glxClientCallback (CallbackListPtr	*list,

+		   pointer		closure,

+		   pointer		data)

+{

+    NewClientInfoRec	*clientinfo = (NewClientInfoRec *) data;

+    ClientPtr		pClient = clientinfo->client;

+    __GLXclientState	*cl = glxGetClient(pClient);

+    __GLXcontext	*cx;

+    int i;

+

+    switch (pClient->clientState) {

+    case ClientStateRunning:

+	/*

+	** By default, assume that the client supports

+	** GLX major version 1 minor version 0 protocol.

+	*/

+	cl->GLClientmajorVersion = 1;

+	cl->GLClientminorVersion = 0;

+	cl->client = pClient;

+	break;

+

+    case ClientStateGone:

+	for (i = 0; i < cl->numCurrentContexts; i++) {

+	    cx = cl->currentContexts[i];

+	    if (cx) {

+		cx->isCurrent = GL_FALSE;

+		if (!cx->idExists)

+		    __glXFreeContext(cx);

+	    }

+	}

+

+	if (cl->returnBuf) free(cl->returnBuf);

+	if (cl->largeCmdBuf) free(cl->largeCmdBuf);

+	if (cl->currentContexts) free(cl->currentContexts);

+	if (cl->GLClientextensions) free(cl->GLClientextensions);

+	break;

+

+    default:

+	break;

+    }

+}

+

+/************************************************************************/

+

+static __GLXprovider *__glXProviderStack;

+

+void GlxPushProvider(__GLXprovider *provider)

+{

+    provider->next = __glXProviderStack;

+    __glXProviderStack = provider;

+}

+

+/*

+** Initialize the GLX extension.

+*/

+void GlxExtensionInit(void)

+{

+    ExtensionEntry *extEntry;

+    ScreenPtr pScreen;

+    int i;

+    __GLXprovider *p;

+    Bool glx_provided = False;

+

+    __glXContextRes = CreateNewResourceType((DeleteType)ContextGone,

+					    "GLXContext");

+    __glXDrawableRes = CreateNewResourceType((DeleteType)DrawableGone,

+					     "GLXDrawable");

+    __glXSwapBarrierRes = CreateNewResourceType((DeleteType)SwapBarrierGone,

+						"GLXSwapBarrier");

+    if (!__glXContextRes || !__glXDrawableRes || !__glXSwapBarrierRes)

+	return;

+

+    if (!dixRequestPrivate(glxClientPrivateKey, sizeof (__GLXclientState)))

+	return;

+    if (!AddCallback (&ClientStateCallback, glxClientCallback, 0))

+	return;

+

+    for (i = 0; i < screenInfo.numScreens; i++) {

+	pScreen = screenInfo.screens[i];

+

+	for (p = __glXProviderStack; p != NULL; p = p->next) {

+	    __GLXscreen *glxScreen;

+

+	    glxScreen = p->screenProbe(pScreen);

+	    if (glxScreen != NULL) {

+	        if (glxScreen->GLXminor < glxMinorVersion)

+		    glxMinorVersion = glxScreen->GLXminor;

+		LogMessage(X_INFO,

+			   "GLX: Initialized %s GL provider for screen %d\n",

+			   p->name, i);

+		break;

+	    }

+

+	}

+

+	if (!p)

+	    LogMessage(X_INFO,

+		       "GLX: no usable GL providers found for screen %d\n", i);

+	else

+	    glx_provided = True;

+    }

+

+    /* don't register extension if GL is not provided on any screen */

+    if (!glx_provided)

+	return;

+

+    /*

+    ** Add extension to server extensions.

+    */

+    extEntry = AddExtension(GLX_EXTENSION_NAME, __GLX_NUMBER_EVENTS,

+			    __GLX_NUMBER_ERRORS, __glXDispatch,

+			    __glXDispatch, ResetExtension,

+			    StandardMinorOpcode);

+    if (!extEntry) {

+	FatalError("__glXExtensionInit: AddExtensions failed\n");

+	return;

+    }

+    if (!AddExtensionAlias(GLX_EXTENSION_ALIAS, extEntry)) {

+	ErrorF("__glXExtensionInit: AddExtensionAlias failed\n");

+	return;

+    }

+

+    __glXErrorBase = extEntry->errorBase;

+    __glXEventBase = extEntry->eventBase;

+}

+

+/************************************************************************/

+

+void __glXFlushContextCache(void)

+{

+    __glXLastContext = 0;

+}

+

+/*

+** Make a context the current one for the GL (in this implementation, there

+** is only one instance of the GL, and we use it to serve all GL clients by

+** switching it between different contexts).  While we are at it, look up

+** a context by its tag and return its (__GLXcontext *).

+*/

+__GLXcontext *__glXForceCurrent(__GLXclientState *cl, GLXContextTag tag,

+				int *error)

+{

+    __GLXcontext *cx;

+

+    /*

+    ** See if the context tag is legal; it is managed by the extension,

+    ** so if it's invalid, we have an implementation error.

+    */

+    cx = (__GLXcontext *) __glXLookupContextByTag(cl, tag);

+    if (!cx) {

+	cl->client->errorValue = tag;

+	*error = __glXError(GLXBadContextTag);

+	return 0;

+    }

+

+    if (!cx->isDirect) {

+	if (cx->drawPriv == NULL) {

+	    /*

+	    ** The drawable has vanished.  It must be a window, because only

+	    ** windows can be destroyed from under us; GLX pixmaps are

+	    ** refcounted and don't go away until no one is using them.

+	    */

+	    *error = __glXError(GLXBadCurrentWindow);

+	    return 0;

+    	}

+    }

+    

+    if (cx->wait && (*cx->wait)(cx, cl, error))

+	return NULL;

+

+    if (cx == __glXLastContext) {

+	/* No need to re-bind */

+	return cx;

+    }

+

+    /* Make this context the current one for the GL. */

+    if (!cx->isDirect) {

+	if (!(*cx->forceCurrent)(cx)) {

+	    /* Bind failed, and set the error code.  Bummer */

+	    cl->client->errorValue = cx->id;

+	    *error = __glXError(GLXBadContextState);

+	    return 0;

+    	}

+    }

+    __glXLastContext = cx;

+    return cx;

+}

+

+/************************************************************************/

+

+void glxSuspendClients(void)

+{

+    int i;

+

+    for (i = 1; i < currentMaxClients; i++) {

+	if (clients[i] && glxGetClient(clients[i])->inUse)

+	    IgnoreClient(clients[i]);

+    }

+

+    glxBlockClients = TRUE;

+}

+

+void glxResumeClients(void)

+{

+    __GLXcontext *cx, *next;

+    int i;

+

+    glxBlockClients = FALSE;

+

+    for (i = 1; i < currentMaxClients; i++) {

+	if (clients[i] && glxGetClient(clients[i])->inUse)

+	    AttendClient(clients[i]);

+    }

+

+    __glXleaveServer(GL_FALSE);

+    for (cx = glxPendingDestroyContexts; cx != NULL; cx = next) {

+	next = cx->next;

+

+	cx->destroy(cx);

+    }

+    glxPendingDestroyContexts = NULL;

+    __glXenterServer(GL_FALSE);

+}

+

+static void

+__glXnopEnterServer(GLboolean rendering)

+{

+}

+    

+static void

+__glXnopLeaveServer(GLboolean rendering)

+{

+}

+

+static void (*__glXenterServerFunc)(GLboolean) = __glXnopEnterServer;

+static void (*__glXleaveServerFunc)(GLboolean)  = __glXnopLeaveServer;

+

+void __glXsetEnterLeaveServerFuncs(void (*enter)(GLboolean),

+				   void (*leave)(GLboolean))

+{

+  __glXenterServerFunc = enter;

+  __glXleaveServerFunc = leave;

+}

+

+

+void __glXenterServer(GLboolean rendering)

+{

+  glxServerLeaveCount--;

+

+  if (glxServerLeaveCount == 0)

+    (*__glXenterServerFunc)(rendering);

+}

+

+void __glXleaveServer(GLboolean rendering)

+{

+  if (glxServerLeaveCount == 0)

+    (*__glXleaveServerFunc)(rendering);

+

+  glxServerLeaveCount++;

+}

+

+/*

+** Top level dispatcher; all commands are executed from here down.

+*/

+static int __glXDispatch(ClientPtr client)

+{

+    REQUEST(xGLXSingleReq);

+    CARD8 opcode;

+    __GLXdispatchSingleProcPtr proc;

+    __GLXclientState *cl;

+    int retval;

+

+    opcode = stuff->glxCode;

+    cl = glxGetClient(client);

+    /* Mark it in use so we suspend it on VT switch. */

+    cl->inUse = TRUE;

+

+    /*

+    ** If we're expecting a glXRenderLarge request, this better be one.

+    */

+    if ((cl->largeCmdRequestsSoFar != 0) && (opcode != X_GLXRenderLarge)) {

+	client->errorValue = stuff->glxCode;

+	return __glXError(GLXBadLargeRequest);

+    }

+

+    /* If we're currently blocking GLX clients, just put this guy to

+     * sleep, reset the request and return. */

+    if (glxBlockClients) {

+	ResetCurrentRequest(client);

+	client->sequence--;

+	IgnoreClient(client);

+	return Success;

+    }

+

+    /*

+    ** Use the opcode to index into the procedure table.

+    */

+    proc = (__GLXdispatchSingleProcPtr) __glXGetProtocolDecodeFunction(& Single_dispatch_info,

+								       opcode,

+								       client->swapped);

+    if (proc != NULL) {

+	GLboolean rendering = opcode <= X_GLXRenderLarge;

+	__glXleaveServer(rendering);

+

+	__pGlxClient = client;

+

+	retval = (*proc)(cl, (GLbyte *) stuff);

+

+	__glXenterServer(rendering);

+    }

+    else {

+	retval = BadRequest;

+    }

+

+    return retval;

+}