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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.
*/
/**
* \file glxcurrent.c
* Client-side GLX interface for current context management.
*/
#include "glxclient.h"
#include "glapi.h"
#include "indirect_init.h"
#ifdef GLX_DIRECT_RENDERING
#include "xf86dri.h"
#endif
/*
** We setup some dummy structures here so that the API can be used
** even if no context is current.
*/
static GLubyte dummyBuffer[__GLX_BUFFER_LIMIT_SIZE];
/*
** Dummy context used by small commands when there is no current context.
** All the
** gl and glx entry points are designed to operate as nop's when using
** the dummy context structure.
*/
static __GLXcontext dummyContext = {
&dummyBuffer[0],
&dummyBuffer[0],
&dummyBuffer[0],
&dummyBuffer[__GLX_BUFFER_LIMIT_SIZE],
sizeof(dummyBuffer),
};
/*
** All indirect rendering contexts will share the same indirect dispatch table.
*/
static __GLapi *IndirectAPI = NULL;
/*
* Current context management and locking
*/
#if defined( PTHREADS )
_X_HIDDEN pthread_mutex_t __glXmutex = PTHREAD_MUTEX_INITIALIZER;
# if defined( GLX_USE_TLS )
/**
* Per-thread GLX context pointer.
*
* \c __glXSetCurrentContext is written is such a way that this pointer can
* \b never be \c NULL. This is important! Because of this
* \c __glXGetCurrentContext can be implemented as trivial macro.
*/
__thread void *__glX_tls_Context __attribute__ ((tls_model("initial-exec")))
= &dummyContext;
_X_HIDDEN void
__glXSetCurrentContext(__GLXcontext * c)
{
__glX_tls_Context = (c != NULL) ? c : &dummyContext;
}
# else
static pthread_once_t once_control = PTHREAD_ONCE_INIT;
/**
* Per-thread data key.
*
* Once \c init_thread_data has been called, the per-thread data key will
* take a value of \c NULL. As each new thread is created the default
* value, in that thread, will be \c NULL.
*/
static pthread_key_t ContextTSD;
/**
* Initialize the per-thread data key.
*
* This function is called \b exactly once per-process (not per-thread!) to
* initialize the per-thread data key. This is ideally done using the
* \c pthread_once mechanism.
*/
static void
init_thread_data(void)
{
if (pthread_key_create(&ContextTSD, NULL) != 0) {
perror("pthread_key_create");
exit(-1);
}
}
_X_HIDDEN void
__glXSetCurrentContext(__GLXcontext * c)
{
pthread_once(&once_control, init_thread_data);
pthread_setspecific(ContextTSD, c);
}
_X_HIDDEN __GLXcontext *
__glXGetCurrentContext(void)
{
void *v;
pthread_once(&once_control, init_thread_data);
v = pthread_getspecific(ContextTSD);
return (v == NULL) ? &dummyContext : (__GLXcontext *) v;
}
# endif /* defined( GLX_USE_TLS ) */
#elif defined( THREADS )
#error Unknown threading method specified.
#else
/* not thread safe */
_X_HIDDEN __GLXcontext *__glXcurrentContext = &dummyContext;
#endif
_X_HIDDEN void
__glXSetCurrentContextNull(void)
{
__glXSetCurrentContext(&dummyContext);
#ifdef GLX_DIRECT_RENDERING
_glapi_set_dispatch(NULL); /* no-op functions */
#endif
}
/************************************************************************/
PUBLIC GLXContext
glXGetCurrentContext(void)
{
GLXContext cx = __glXGetCurrentContext();
if (cx == &dummyContext) {
return NULL;
}
else {
return cx;
}
}
PUBLIC GLXDrawable
glXGetCurrentDrawable(void)
{
GLXContext gc = __glXGetCurrentContext();
return gc->currentDrawable;
}
/************************************************************************/
/**
* Sends a GLX protocol message to the specified display to make the context
* and the drawables current.
*
* \param dpy Display to send the message to.
* \param opcode Major opcode value for the display.
* \param gc_id Context tag for the context to be made current.
* \param draw Drawable ID for the "draw" drawable.
* \param read Drawable ID for the "read" drawable.
* \param reply Space to store the X-server's reply.
*
* \warning
* This function assumes that \c dpy is locked with \c LockDisplay on entry.
*/
static Bool
SendMakeCurrentRequest(Display * dpy, CARD8 opcode,
GLXContextID gc_id, GLXContextTag gc_tag,
GLXDrawable draw, GLXDrawable read,
xGLXMakeCurrentReply * reply)
{
Bool ret;
LockDisplay(dpy);
if (draw == read) {
xGLXMakeCurrentReq *req;
GetReq(GLXMakeCurrent, req);
req->reqType = opcode;
req->glxCode = X_GLXMakeCurrent;
req->drawable = draw;
req->context = gc_id;
req->oldContextTag = gc_tag;
}
else {
__GLXdisplayPrivate *priv = __glXInitialize(dpy);
/* If the server can support the GLX 1.3 version, we should
* perfer that. Not only that, some servers support GLX 1.3 but
* not the SGI extension.
*/
if ((priv->majorVersion > 1) || (priv->minorVersion >= 3)) {
xGLXMakeContextCurrentReq *req;
GetReq(GLXMakeContextCurrent, req);
req->reqType = opcode;
req->glxCode = X_GLXMakeContextCurrent;
req->drawable = draw;
req->readdrawable = read;
req->context = gc_id;
req->oldContextTag = gc_tag;
}
else {
xGLXVendorPrivateWithReplyReq *vpreq;
xGLXMakeCurrentReadSGIReq *req;
GetReqExtra(GLXVendorPrivateWithReply,
sz_xGLXMakeCurrentReadSGIReq -
sz_xGLXVendorPrivateWithReplyReq, vpreq);
req = (xGLXMakeCurrentReadSGIReq *) vpreq;
req->reqType = opcode;
req->glxCode = X_GLXVendorPrivateWithReply;
req->vendorCode = X_GLXvop_MakeCurrentReadSGI;
req->drawable = draw;
req->readable = read;
req->context = gc_id;
req->oldContextTag = gc_tag;
}
}
ret = _XReply(dpy, (xReply *) reply, 0, False);
UnlockDisplay(dpy);
SyncHandle();
return ret;
}
#ifdef GLX_DIRECT_RENDERING
static __GLXDRIdrawable *
FetchDRIDrawable(Display * dpy, GLXDrawable glxDrawable, GLXContext gc)
{
__GLXdisplayPrivate *const priv = __glXInitialize(dpy);
__GLXDRIdrawable *pdraw;
__GLXscreenConfigs *psc;
if (priv == NULL)
return NULL;
psc = &priv->screenConfigs[gc->screen];
if (psc->drawHash == NULL)
return NULL;
if (__glxHashLookup(psc->drawHash, glxDrawable, (void *) &pdraw) == 0)
return pdraw;
pdraw = psc->driScreen->createDrawable(psc, glxDrawable,
glxDrawable, gc->mode);
if (__glxHashInsert(psc->drawHash, glxDrawable, pdraw)) {
(*pdraw->destroyDrawable) (pdraw);
return NULL;
}
return pdraw;
}
#endif /* GLX_DIRECT_RENDERING */
static void
__glXGenerateError(Display * dpy, GLXContext gc, XID resource,
BYTE errorCode, CARD16 minorCode)
{
xError error;
error.errorCode = errorCode;
error.resourceID = resource;
error.sequenceNumber = dpy->request;
error.type = X_Error;
error.majorCode = gc->majorOpcode;
error.minorCode = minorCode;
_XError(dpy, &error);
}
/**
* Make a particular context current.
*
* \note This is in this file so that it can access dummyContext.
*/
static Bool
MakeContextCurrent(Display * dpy, GLXDrawable draw,
GLXDrawable read, GLXContext gc)
{
xGLXMakeCurrentReply reply;
const GLXContext oldGC = __glXGetCurrentContext();
const CARD8 opcode = __glXSetupForCommand(dpy);
const CARD8 oldOpcode = ((gc == oldGC) || (oldGC == &dummyContext))
? opcode : __glXSetupForCommand(oldGC->currentDpy);
Bool bindReturnValue;
__GLXattribute *state;
if (!opcode || !oldOpcode) {
return GL_FALSE;
}
/* Make sure that the new context has a nonzero ID. In the request,
* a zero context ID is used only to mean that we bind to no current
* context.
*/
if ((gc != NULL) && (gc->xid == None)) {
return GL_FALSE;
}
if (gc == NULL && (draw != None || read != None)) {
__glXGenerateError(dpy, gc, (draw != None) ? draw : read,
BadMatch, X_GLXMakeContextCurrent);
return False;
}
if (gc != NULL && (draw == None || read == None)) {
__glXGenerateError(dpy, gc, None, BadMatch, X_GLXMakeContextCurrent);
return False;
}
_glapi_check_multithread();
if (gc != NULL && gc->thread_id != 0 && gc->thread_id != _glthread_GetID()) {
__glXGenerateError(dpy, gc, gc->xid,
BadAccess, X_GLXMakeContextCurrent);
return False;
}
#ifdef GLX_DIRECT_RENDERING
/* Bind the direct rendering context to the drawable */
if (gc && gc->driContext) {
__GLXDRIdrawable *pdraw = FetchDRIDrawable(dpy, draw, gc);
__GLXDRIdrawable *pread = FetchDRIDrawable(dpy, read, gc);
if ((pdraw == NULL) || (pread == NULL)) {
__glXGenerateError(dpy, gc, (pdraw == NULL) ? draw : read,
GLXBadDrawable, X_GLXMakeContextCurrent);
return False;
}
bindReturnValue =
(gc->driContext->bindContext) (gc->driContext, pdraw, pread);
}
else if (!gc && oldGC && oldGC->driContext) {
bindReturnValue = True;
}
else
#endif
{
/* Send a glXMakeCurrent request to bind the new context. */
bindReturnValue =
SendMakeCurrentRequest(dpy, opcode, gc ? gc->xid : None,
((dpy != oldGC->currentDpy)
|| oldGC->isDirect)
? None : oldGC->currentContextTag, draw, read,
&reply);
}
if (!bindReturnValue) {
return False;
}
#ifdef GLX_DIRECT_RENDERING
if ((dpy != oldGC->currentDpy || (gc && gc->driContext)) &&
!oldGC->isDirect && oldGC != &dummyContext) {
#else
if ((dpy != oldGC->currentDpy) && oldGC != &dummyContext) {
#endif
xGLXMakeCurrentReply dummy_reply;
/* We are either switching from one dpy to another and have to
* send a request to the previous dpy to unbind the previous
* context, or we are switching away from a indirect context to
* a direct context and have to send a request to the dpy to
* unbind the previous context.
*/
(void) SendMakeCurrentRequest(oldGC->currentDpy, oldOpcode, None,
oldGC->currentContextTag, None, None,
&dummy_reply);
}
#ifdef GLX_DIRECT_RENDERING
else if (oldGC->driContext && oldGC != gc) {
oldGC->driContext->unbindContext(oldGC->driContext);
}
#endif
/* Update our notion of what is current */
__glXLock();
if (gc == oldGC) {
/* Even though the contexts are the same the drawable might have
* changed. Note that gc cannot be the dummy, and that oldGC
* cannot be NULL, therefore if they are the same, gc is not
* NULL and not the dummy.
*/
gc->currentDrawable = draw;
gc->currentReadable = read;
}
else {
if (oldGC != &dummyContext) {
/* Old current context is no longer current to anybody */
oldGC->currentDpy = 0;
oldGC->currentDrawable = None;
oldGC->currentReadable = None;
oldGC->currentContextTag = 0;
oldGC->thread_id = 0;
if (oldGC->xid == None) {
/* We are switching away from a context that was
* previously destroyed, so we need to free the memory
* for the old handle.
*/
#ifdef GLX_DIRECT_RENDERING
/* Destroy the old direct rendering context */
if (oldGC->driContext) {
oldGC->driContext->destroyContext(oldGC->driContext,
oldGC->psc,
oldGC->createDpy);
oldGC->driContext = NULL;
}
#endif
__glXFreeContext(oldGC);
}
}
if (gc) {
__glXSetCurrentContext(gc);
gc->currentDpy = dpy;
gc->currentDrawable = draw;
gc->currentReadable = read;
gc->thread_id = _glthread_GetID();
#ifdef GLX_DIRECT_RENDERING
if (!gc->driContext) {
#endif
if (!IndirectAPI)
IndirectAPI = __glXNewIndirectAPI();
_glapi_set_dispatch(IndirectAPI);
#ifdef GLX_USE_APPLEGL
do {
extern void XAppleDRIUseIndirectDispatch(void);
XAppleDRIUseIndirectDispatch();
} while (0);
#endif
state = (__GLXattribute *) (gc->client_state_private);
gc->currentContextTag = reply.contextTag;
if (state->array_state == NULL) {
(void) glGetString(GL_EXTENSIONS);
(void) glGetString(GL_VERSION);
__glXInitVertexArrayState(gc);
}
#ifdef GLX_DIRECT_RENDERING
}
else {
gc->currentContextTag = -1;
}
#endif
}
else {
__glXSetCurrentContextNull();
}
}
__glXUnlock();
return GL_TRUE;
}
PUBLIC Bool
glXMakeCurrent(Display * dpy, GLXDrawable draw, GLXContext gc)
{
return MakeContextCurrent(dpy, draw, draw, gc);
}
PUBLIC
GLX_ALIAS(Bool, glXMakeCurrentReadSGI,
(Display * dpy, GLXDrawable d, GLXDrawable r, GLXContext ctx),
(dpy, d, r, ctx), MakeContextCurrent)
PUBLIC
GLX_ALIAS(Bool, glXMakeContextCurrent,
(Display * dpy, GLXDrawable d, GLXDrawable r,
GLXContext ctx), (dpy, d, r, ctx), MakeContextCurrent)
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