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 "extinit.h"
#include "glx_extinit.h"
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#include "unpack.h"
#include "glxutil.h"
#include "glxext.h"
#include "indirect_table.h"
#include "indirect_util.h"
/*
** X resources.
*/
RESTYPE __glXContextRes;
RESTYPE __glXDrawableRes;
/*
** Reply for most singles.
*/
xGLXSingleReply __glXReply;
static DevPrivateKeyRec glxClientPrivateKeyRec;
#define glxClientPrivateKey (&glxClientPrivateKeyRec)
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/*
** Forward declarations.
*/
static int __glXDispatch(ClientPtr);
static GLboolean __glXFreeContext(__GLXcontext * cx);
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/*
** Called when the extension is reset.
*/
static void
ResetExtension(ExtensionEntry * extEntry)
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{
lastGLContext = NULL;
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}
/*
** Reset state used to keep track of large (multi-request) commands.
*/
void
__glXResetLargeCommandStatus(__GLXclientState * cl)
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{
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.
*/
static int
ContextGone(__GLXcontext * cx, XID id)
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{
cx->idExists = GL_FALSE;
if (!cx->currentClient) {
__glXFreeContext(cx);
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}
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)
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{
__GLXcontext *c, *next;
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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;
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}
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/* drop our reference to any backing pixmap */
if (glxPriv->type == GLX_DRAWABLE_PIXMAP)
glxPriv->pDraw->pScreen->DestroyPixmap((PixmapPtr) glxPriv->pDraw);
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glxPriv->destroy(glxPriv);
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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;
}
}
}
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/*
** Free a context.
*/
static GLboolean
__glXFreeContext(__GLXcontext * cx)
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{
if (cx->idExists || cx->currentClient)
return GL_FALSE;
__glXRemoveFromContextList(cx);
free(cx->feedbackBuf);
free(cx->selectBuf);
if (cx == lastGLContext) {
lastGLContext = NULL;
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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) {
__glXleaveServer(GL_FALSE);
cx->destroy(cx);
__glXenterServer(GL_FALSE);
}
else {
cx->next = glxPendingDestroyContexts;
glxPendingDestroyContexts = cx;
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}
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)
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{
errorOccured = GL_TRUE;
}
/*
** Clear the error flag before calling the GL command.
*/
void
__glXClearErrorOccured(void)
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{
errorOccured = GL_FALSE;
}
/*
** Check if the GL command caused an error.
*/
GLboolean
__glXErrorOccured(void)
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{
return errorOccured;
}
static int __glXErrorBase;
int __glXEventBase;
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int
__glXError(int error)
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{
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);
__GLXcontext *c, *next;
switch (pClient->clientState) {
case ClientStateRunning:
cl->client = pClient;
break;
case ClientStateGone:
/* detach from all current contexts */
for (c = glxAllContexts; c; c = next) {
next = c->next;
if (c->currentClient == pClient) {
c->loseCurrent(c);
lastGLContext = NULL;
c->currentClient = NULL;
FreeResourceByType(c->id, __glXContextRes, FALSE);
}
}
free(cl->returnBuf);
free(cl->largeCmdBuf);
free(cl->GLClientextensions);
break;
default:
break;
}
}
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/************************************************************************/
static __GLXprovider *__glXProviderStack;
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;
}
}
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/*
** Initialize the GLX extension.
*/
void
GlxExtensionInit(void)
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{
ExtensionEntry *extEntry;
ScreenPtr pScreen;
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int i;
__GLXprovider *p, **stack;
Bool glx_provided = False;
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if (serverGeneration == 1) {
for (stack = &__glXProviderStack; *stack; stack = &(*stack)->next)
;
*stack = &__glXDRISWRastProvider;
}
/* Mesa requires at least one True/DirectColor visual */
if (!checkScreenVisuals())
return;
__glXContextRes = CreateNewResourceType((DeleteType) ContextGone,
"GLXContext");
__glXDrawableRes = CreateNewResourceType((DeleteType) DrawableGone,
"GLXDrawable");
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if (!__glXContextRes || !__glXDrawableRes)
return;
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SetResourceTypeSizeFunc(__glXDrawableRes, GetGLXDrawableBytes);
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) {
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.
*/
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extEntry = AddExtension(GLX_EXTENSION_NAME, __GLX_NUMBER_EVENTS,
__GLX_NUMBER_ERRORS, __glXDispatch,
__glXDispatch, ResetExtension, StandardMinorOpcode);
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if (!extEntry) {
FatalError("__glXExtensionInit: AddExtensions failed\n");
return;
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}
if (!AddExtensionAlias(GLX_EXTENSION_ALIAS, extEntry)) {
ErrorF("__glXExtensionInit: AddExtensionAlias failed\n");
return;
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}
__glXErrorBase = extEntry->errorBase;
__glXEventBase = extEntry->eventBase;
#if PRESENT
__glXregisterPresentCompleteNotify();
#endif
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}
/************************************************************************/
/*
** 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)
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{
__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.
*/
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cx = __glXLookupContextByTag(cl, tag);
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if (!cx) {
cl->client->errorValue = tag;
*error = __glXError(GLXBadContextTag);
return 0;
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}
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;
}
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}
if (cx->wait && (*cx->wait) (cx, cl, error))
return NULL;
if (cx == lastGLContext) {
/* No need to re-bind */
return cx;
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}
/* 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;
}
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}
return cx;
}
/************************************************************************/
void
glxSuspendClients(void)
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{
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)
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{
__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;
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cx->destroy(cx);
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}
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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{
}
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static void
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__glXnopLeaveServer(GLboolean rendering)
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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--;
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if (glxServerLeaveCount == 0)
(*__glXenterServerFunc) (rendering);
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}
void
__glXleaveServer(GLboolean rendering)
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{
if (glxServerLeaveCount == 0)
(*__glXleaveServerFunc) (rendering);
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glxServerLeaveCount++;
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}
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;
}
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/*
** Top level dispatcher; all commands are executed from here down.
*/
static int
__glXDispatch(ClientPtr client)
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{
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.
*/
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if ((cl->largeCmdRequestsSoFar != 0) && (opcode != X_GLXRenderLarge)) {
client->errorValue = stuff->glxCode;
return __glXError(GLXBadLargeRequest);
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}
/* 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 = __glXGetProtocolDecodeFunction(&Single_dispatch_info, opcode,
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client->swapped);
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if (proc != NULL) {
GLboolean rendering = opcode <= X_GLXRenderLarge;
__glXleaveServer(rendering);
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retval = (*proc) (cl, (GLbyte *) stuff);
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__glXenterServer(rendering);
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}
else {
retval = BadRequest;
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}
return retval;
}