xenocara/xserver/glx/glxext.c

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/*
* 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.
*/
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#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"
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#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;
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/*
** X resources.
*/
RESTYPE __glXContextRes;
RESTYPE __glXDrawableRes;
RESTYPE __glXSwapBarrierRes;
/*
** Reply for most singles.
*/
xGLXSingleReply __glXReply;
static DevPrivateKeyRec glxClientPrivateKeyRec;
#define glxClientPrivateKey (&glxClientPrivateKeyRec)
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/*
** Client that called into GLX dispatch.
*/
ClientPtr __pGlxClient;
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/*
** 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;
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/*
** 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, *next;
/* 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 = next) {
next = 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->drawPriv == glxPriv)
c->drawPriv = NULL;
if (c->readPriv == glxPriv)
c->readPriv = NULL;
if (!c->idExists && !c->isCurrent)
__glXFreeContext(c);
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}
glxPriv->destroy(glxPriv);
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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;
}
}
}
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/*
** Free a context.
*/
GLboolean __glXFreeContext(__GLXcontext *cx)
{
if (cx->idExists || cx->isCurrent) return GL_FALSE;
free(cx->feedbackBuf);
free(cx->selectBuf);
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if (cx == __glXLastContext) {
__glXFlushContextCache();
}
__glXRemoveFromContextList(cx);
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/* 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. */
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if (!glxBlockClients) {
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__glXleaveServer(GL_FALSE);
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cx->destroy(cx);
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__glXenterServer(GL_FALSE);
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} 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);
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}
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.
*/
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void __glXErrorCallBack(GLenum code)
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{
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;
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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);
}
}
free(cl->returnBuf);
free(cl->largeCmdBuf);
free(cl->currentContexts);
free(cl->GLClientextensions);
break;
default:
break;
}
}
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/************************************************************************/
static __GLXprovider *__glXProviderStack;
void GlxPushProvider(__GLXprovider *provider)
{
provider->next = __glXProviderStack;
__glXProviderStack = provider;
}
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/*
** Initialize the GLX extension.
*/
void GlxExtensionInit(void)
{
ExtensionEntry *extEntry;
ScreenPtr pScreen;
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int i;
__GLXprovider *p;
Bool glx_provided = False;
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__glXContextRes = CreateNewResourceType((DeleteType)ContextGone,
"GLXContext");
__glXDrawableRes = CreateNewResourceType((DeleteType)DrawableGone,
"GLXDrawable");
__glXSwapBarrierRes = CreateNewResourceType((DeleteType)SwapBarrierGone,
"GLXSwapBarrier");
if (!__glXContextRes || !__glXDrawableRes || !__glXSwapBarrierRes)
return;
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if (!dixRegisterPrivateKey(&glxClientPrivateKeyRec, PRIVATE_CLIENT, 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;
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/*
** 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;
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}
/************************************************************************/
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;
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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]);
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}
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]);
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}
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__glXleaveServer(GL_FALSE);
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for (cx = glxPendingDestroyContexts; cx != NULL; cx = next) {
next = cx->next;
cx->destroy(cx);
}
glxPendingDestroyContexts = NULL;
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__glXenterServer(GL_FALSE);
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}
static void
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__glXnopEnterServer(GLboolean rendering)
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{
}
static void
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__glXnopLeaveServer(GLboolean rendering)
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{
}
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static void (*__glXenterServerFunc)(GLboolean) = __glXnopEnterServer;
static void (*__glXleaveServerFunc)(GLboolean) = __glXnopLeaveServer;
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void __glXsetEnterLeaveServerFuncs(void (*enter)(GLboolean),
void (*leave)(GLboolean))
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{
__glXenterServerFunc = enter;
__glXleaveServerFunc = leave;
}
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void __glXenterServer(GLboolean rendering)
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{
glxServerLeaveCount--;
if (glxServerLeaveCount == 0)
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(*__glXenterServerFunc)(rendering);
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}
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void __glXleaveServer(GLboolean rendering)
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{
if (glxServerLeaveCount == 0)
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(*__glXleaveServerFunc)(rendering);
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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;
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/*
** 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;
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}
/*
** Use the opcode to index into the procedure table.
*/
proc = (__GLXdispatchSingleProcPtr) __glXGetProtocolDecodeFunction(& Single_dispatch_info,
opcode,
client->swapped);
if (proc != NULL) {
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GLboolean rendering = opcode <= X_GLXRenderLarge;
__glXleaveServer(rendering);
__pGlxClient = client;
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retval = (*proc)(cl, (GLbyte *) stuff);
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__glXenterServer(rendering);
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}
else {
retval = BadRequest;
}
return retval;
}