xserver-multidpi/glx/glxext.c
Adam Jackson d8ec33fe05 glx: Use vnd layer for dispatch (v4)
The big change here is MakeCurrent and context tag tracking. We now
delegate context tags entirely to the vnd layer, and simply store a
pointer to the context state as the tag data. If a context is deleted
while it's current, we allocate a fake ID for the context and move the
context state there, so the tag data still points to a real context. As
a result we can stop trying so hard to detach the client from contexts
at disconnect time and just let resource destruction handle it.

Since vnd handles all the MakeCurrent protocol now, our request handlers
for it can just be return BadImplementation. We also remove a bunch of
LEGAL_NEW_RESOURCE, because now by the time we're called vnd has already
allocated its tracking resource on that XID.

v2: Update to match v2 of the vnd import, and remove more redundant work
like request length checks.

v3: Add/remove the XID map from the vendor private thunk, not the
backend. (Kyle Brenneman)

v4: Fix deletion of ghost contexts (Kyle Brenneman)

Signed-off-by: Adam Jackson <ajax@redhat.com>
2018-02-14 17:04:44 -05:00

743 lines
20 KiB
C

/*
* 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 "extinit.h"
#include "glx_extinit.h"
#include "unpack.h"
#include "glxutil.h"
#include "glxext.h"
#include "indirect_table.h"
#include "indirect_util.h"
#include "glxvndabi.h"
/*
** X resources.
*/
static int glxGeneration;
RESTYPE __glXContextRes;
RESTYPE __glXDrawableRes;
static DevPrivateKeyRec glxClientPrivateKeyRec;
#define glxClientPrivateKey (&glxClientPrivateKeyRec)
/*
** Forward declarations.
*/
static int __glXDispatch(ClientPtr);
static GLboolean __glXFreeContext(__GLXcontext * cx);
/*
** 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. If the context is current for a client
* the dispatch layer will have moved the context struct to a fake resource ID
* and cx here will be NULL. Otherwise we really free the context.
*/
static int
ContextGone(__GLXcontext * cx, XID id)
{
if (!cx)
return TRUE;
if (!cx->currentClient)
__glXFreeContext(cx);
return TRUE;
}
static __GLXcontext *glxPendingDestroyContexts;
static __GLXcontext *glxAllContexts;
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, *next;
if (glxPriv->type == GLX_DRAWABLE_WINDOW) {
/* If this was created by glXCreateWindow, free the matching resource */
if (glxPriv->drawId != glxPriv->pDraw->id) {
if (xid == glxPriv->drawId)
FreeResourceByType(glxPriv->pDraw->id, __glXDrawableRes, TRUE);
else
FreeResourceByType(glxPriv->drawId, __glXDrawableRes, TRUE);
}
/* otherwise this window was implicitly created by MakeCurrent */
}
for (c = glxAllContexts; c; c = next) {
next = c->next;
if (c->currentClient &&
(c->drawPriv == glxPriv || c->readPriv == glxPriv)) {
/* flush the context */
glFlush();
/* just force a re-bind the next time through */
(*c->loseCurrent) (c);
lastGLContext = NULL;
}
if (c->drawPriv == glxPriv)
c->drawPriv = NULL;
if (c->readPriv == glxPriv)
c->readPriv = NULL;
}
/* drop our reference to any backing pixmap */
if (glxPriv->type == GLX_DRAWABLE_PIXMAP)
glxPriv->pDraw->pScreen->DestroyPixmap((PixmapPtr) glxPriv->pDraw);
glxPriv->destroy(glxPriv);
return TRUE;
}
Bool
__glXAddContext(__GLXcontext * cx)
{
/* Register this context as a resource.
*/
if (!AddResource(cx->id, __glXContextRes, (void *)cx)) {
return FALSE;
}
cx->next = glxAllContexts;
glxAllContexts = cx;
return TRUE;
}
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.
*/
static GLboolean
__glXFreeContext(__GLXcontext * cx)
{
if (cx->idExists || cx->currentClient)
return GL_FALSE;
__glXRemoveFromContextList(cx);
free(cx->feedbackBuf);
free(cx->selectBuf);
if (cx == lastGLContext) {
lastGLContext = NULL;
}
/* 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) {
cx->destroy(cx);
}
else {
cx->next = glxPendingDestroyContexts;
glxPendingDestroyContexts = cx;
}
return GL_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, void *closure, void *data)
{
NewClientInfoRec *clientinfo = (NewClientInfoRec *) data;
ClientPtr pClient = clientinfo->client;
__GLXclientState *cl = glxGetClient(pClient);
switch (pClient->clientState) {
case ClientStateGone:
free(cl->returnBuf);
free(cl->largeCmdBuf);
free(cl->GLClientextensions);
cl->returnBuf = NULL;
cl->GLClientextensions = NULL;
break;
default:
break;
}
}
/************************************************************************/
static __GLXprovider *__glXProviderStack = &__glXDRISWRastProvider;
void
GlxPushProvider(__GLXprovider * provider)
{
provider->next = __glXProviderStack;
__glXProviderStack = provider;
}
static Bool
checkScreenVisuals(void)
{
int i, j;
for (i = 0; i < screenInfo.numScreens; i++) {
ScreenPtr screen = screenInfo.screens[i];
for (j = 0; j < screen->numVisuals; j++) {
if (screen->visuals[j].class == TrueColor ||
screen->visuals[j].class == DirectColor)
return TRUE;
}
}
return FALSE;
}
static void
GetGLXDrawableBytes(void *value, XID id, ResourceSizePtr size)
{
__GLXdrawable *draw = value;
size->resourceSize = 0;
size->pixmapRefSize = 0;
size->refCnt = 1;
if (draw->type == GLX_DRAWABLE_PIXMAP) {
SizeType pixmapSizeFunc = GetResourceTypeSizeFunc(RT_PIXMAP);
ResourceSizeRec pixmapSize = { 0, };
pixmapSizeFunc((PixmapPtr)draw->pDraw, draw->pDraw->id, &pixmapSize);
size->pixmapRefSize += pixmapSize.pixmapRefSize;
}
}
static void
xorgGlxCloseExtension(const ExtensionEntry *extEntry)
{
lastGLContext = NULL;
}
static int
xorgGlxHandleRequest(ClientPtr client)
{
return __glXDispatch(client);
}
static ScreenPtr
screenNumToScreen(int screen)
{
if (screen < 0 || screen >= screenInfo.numScreens)
return NULL;
return screenInfo.screens[screen];
}
static int
maybe_swap32(ClientPtr client, int x)
{
return client->swapped ? bswap_32(x) : x;
}
static GlxServerVendor *
vendorForScreen(ClientPtr client, int screen)
{
screen = maybe_swap32(client, screen);
return glxServer.getVendorForScreen(client, screenNumToScreen(screen));
}
/* this ought to be generated */
static int
xorgGlxThunkRequest(ClientPtr client)
{
REQUEST(xGLXVendorPrivateReq);
CARD32 vendorCode = maybe_swap32(client, stuff->vendorCode);
GlxServerVendor *vendor = NULL;
XID resource = 0;
int ret;
switch (vendorCode) {
case X_GLXvop_QueryContextInfoEXT: {
xGLXQueryContextInfoEXTReq *req = (void *)stuff;
REQUEST_AT_LEAST_SIZE(*req);
if (!(vendor = glxServer.getXIDMap(maybe_swap32(client, req->context))))
return __glXError(GLXBadContext);
break;
}
case X_GLXvop_GetFBConfigsSGIX: {
xGLXGetFBConfigsSGIXReq *req = (void *)stuff;
REQUEST_AT_LEAST_SIZE(*req);
if (!(vendor = vendorForScreen(client, req->screen)))
return BadValue;
break;
}
case X_GLXvop_CreateContextWithConfigSGIX: {
xGLXCreateContextWithConfigSGIXReq *req = (void *)stuff;
REQUEST_AT_LEAST_SIZE(*req);
resource = maybe_swap32(client, req->context);
if (!(vendor = vendorForScreen(client, req->screen)))
return BadValue;
break;
}
case X_GLXvop_CreateGLXPixmapWithConfigSGIX: {
xGLXCreateGLXPixmapWithConfigSGIXReq *req = (void *)stuff;
REQUEST_AT_LEAST_SIZE(*req);
resource = maybe_swap32(client, req->glxpixmap);
if (!(vendor = vendorForScreen(client, req->screen)))
return BadValue;
break;
}
case X_GLXvop_CreateGLXPbufferSGIX: {
xGLXCreateGLXPbufferSGIXReq *req = (void *)stuff;
REQUEST_AT_LEAST_SIZE(*req);
resource = maybe_swap32(client, req->pbuffer);
if (!(vendor = vendorForScreen(client, req->screen)))
return BadValue;
break;
}
/* same offset for the drawable for these three */
case X_GLXvop_DestroyGLXPbufferSGIX:
case X_GLXvop_ChangeDrawableAttributesSGIX:
case X_GLXvop_GetDrawableAttributesSGIX: {
xGLXGetDrawableAttributesSGIXReq *req = (void *)stuff;
REQUEST_AT_LEAST_SIZE(*req);
if (!(vendor = glxServer.getXIDMap(maybe_swap32(client,
req->drawable))))
return __glXError(GLXBadDrawable);
break;
}
/* most things just use the standard context tag */
default: {
/* size checked by vnd layer already */
GLXContextTag tag = maybe_swap32(client, stuff->contextTag);
vendor = glxServer.getContextTag(client, tag);
if (!vendor)
return __glXError(GLXBadContextTag);
break;
}
}
/* If we're creating a resource, add the map now */
if (resource) {
LEGAL_NEW_RESOURCE(resource, client);
if (!glxServer.addXIDMap(resource, vendor))
return BadAlloc;
}
ret = glxServer.forwardRequest(vendor, client);
if (ret == Success && vendorCode == X_GLXvop_DestroyGLXPbufferSGIX) {
xGLXDestroyGLXPbufferSGIXReq *req = (void *)stuff;
glxServer.removeXIDMap(maybe_swap32(client, req->pbuffer));
}
if (ret != Success)
glxServer.removeXIDMap(resource);
return ret;
}
static GlxServerDispatchProc
xorgGlxGetDispatchAddress(CARD8 minorOpcode, CARD32 vendorCode)
{
/* we don't support any other GLX opcodes */
if (minorOpcode != X_GLXVendorPrivate &&
minorOpcode != X_GLXVendorPrivateWithReply)
return NULL;
/* we only support some vendor private requests */
if (!__glXGetProtocolDecodeFunction(&VendorPriv_dispatch_info, vendorCode,
FALSE))
return NULL;
return xorgGlxThunkRequest;
}
static Bool
xorgGlxServerPreInit(const ExtensionEntry *extEntry)
{
if (glxGeneration != serverGeneration) {
/* Mesa requires at least one True/DirectColor visual */
if (!checkScreenVisuals())
return FALSE;
__glXContextRes = CreateNewResourceType((DeleteType) ContextGone,
"GLXContext");
__glXDrawableRes = CreateNewResourceType((DeleteType) DrawableGone,
"GLXDrawable");
if (!__glXContextRes || !__glXDrawableRes)
return FALSE;
if (!dixRegisterPrivateKey
(&glxClientPrivateKeyRec, PRIVATE_CLIENT, sizeof(__GLXclientState)))
return FALSE;
if (!AddCallback(&ClientStateCallback, glxClientCallback, 0))
return FALSE;
__glXErrorBase = extEntry->errorBase;
__glXEventBase = extEntry->eventBase;
SetResourceTypeSizeFunc(__glXDrawableRes, GetGLXDrawableBytes);
#if PRESENT
__glXregisterPresentCompleteNotify();
#endif
glxGeneration = serverGeneration;
}
return glxGeneration == serverGeneration;
}
static GlxServerVendor *glvnd_vendor = NULL;
static GlxServerVendor *
xorgGlxInitGLVNDVendor(void)
{
if (glvnd_vendor == NULL) {
GlxServerImports *imports = NULL;
imports = glxServer.allocateServerImports();
if (imports != NULL) {
imports->extensionCloseDown = xorgGlxCloseExtension;
imports->handleRequest = xorgGlxHandleRequest;
imports->getDispatchAddress = xorgGlxGetDispatchAddress;
imports->makeCurrent = xorgGlxMakeCurrent;
glvnd_vendor = glxServer.createVendor(imports);
glxServer.freeServerImports(imports);
}
}
return glvnd_vendor;
}
static void
xorgGlxServerInit(CallbackListPtr *pcbl, void *param, void *ext)
{
const ExtensionEntry *extEntry = ext;
int i;
if (!xorgGlxServerPreInit(extEntry)) {
return;
}
if (!xorgGlxInitGLVNDVendor()) {
return;
}
for (i = 0; i < screenInfo.numScreens; i++) {
ScreenPtr pScreen = screenInfo.screens[i];
__GLXprovider *p;
if (glxServer.getVendorForScreen(NULL, pScreen) != NULL) {
// There's already a vendor registered.
LogMessage(X_INFO, "GLX: Another vendor is already registered for screen %d\n", i);
continue;
}
for (p = __glXProviderStack; p != NULL; p = p->next) {
__GLXscreen *glxScreen = p->screenProbe(pScreen);
if (glxScreen != NULL) {
LogMessage(X_INFO,
"GLX: Initialized %s GL provider for screen %d\n",
p->name, i);
break;
}
}
if (p) {
glxServer.setScreenVendor(pScreen, glvnd_vendor);
} else {
LogMessage(X_INFO,
"GLX: no usable GL providers found for screen %d\n", i);
}
}
}
Bool
xorgGlxCreateVendor(void)
{
return AddCallback(glxServer.extensionInitCallback, xorgGlxServerInit, NULL);
}
/************************************************************************/
/*
** 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 = __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 == lastGLContext) {
/* No need to re-bind */
return cx;
}
/* Make this context the current one for the GL. */
if (!cx->isDirect) {
/*
* If it is being forced, it means that this context was already made
* current. So it cannot just be made current again without decrementing
* refcount's
*/
(*cx->loseCurrent) (cx);
lastGLContext = cx;
if (!(*cx->makeCurrent) (cx)) {
/* Bind failed, and set the error code. Bummer */
lastGLContext = NULL;
cl->client->errorValue = cx->id;
*error = __glXError(GLXBadContextState);
return 0;
}
}
return cx;
}
/************************************************************************/
void
glxSuspendClients(void)
{
int i;
for (i = 1; i < currentMaxClients; i++) {
if (glxGetClient(clients[i])->client)
IgnoreClient(clients[i]);
}
glxBlockClients = TRUE;
}
void
glxResumeClients(void)
{
__GLXcontext *cx, *next;
int i;
glxBlockClients = FALSE;
for (i = 1; i < currentMaxClients; i++) {
if (glxGetClient(clients[i])->client)
AttendClient(clients[i]);
}
for (cx = glxPendingDestroyContexts; cx != NULL; cx = next) {
next = cx->next;
cx->destroy(cx);
}
glxPendingDestroyContexts = NULL;
}
static glx_gpa_proc _get_proc_address;
void
__glXsetGetProcAddress(glx_gpa_proc get_proc_address)
{
_get_proc_address = get_proc_address;
}
void *__glGetProcAddress(const char *proc)
{
void *ret = (void *) _get_proc_address(proc);
return ret ? ret : (void *) NoopDDA;
}
/*
** 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 = BadRequest;
opcode = stuff->glxCode;
cl = glxGetClient(client);
/*
** 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 (!cl->client)
cl->client = client;
/* 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 = __glXGetProtocolDecodeFunction(&Single_dispatch_info, opcode,
client->swapped);
if (proc != NULL)
retval = (*proc) (cl, (GLbyte *) stuff);
return retval;
}