mirror of https://gitlab.freedesktop.org/mesa/mesa
531 lines
14 KiB
C
531 lines
14 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.
|
|
*/
|
|
|
|
/**
|
|
* \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( USE_XTHREADS )
|
|
|
|
/* thread safe */
|
|
static GLboolean TSDinitialized = GL_FALSE;
|
|
static xthread_key_t ContextTSD;
|
|
|
|
_X_HIDDEN __GLXcontext *
|
|
__glXGetCurrentContext(void)
|
|
{
|
|
if (!TSDinitialized) {
|
|
xthread_key_create(&ContextTSD, NULL);
|
|
TSDinitialized = GL_TRUE;
|
|
return &dummyContext;
|
|
}
|
|
else {
|
|
void *p;
|
|
xthread_get_specific(ContextTSD, &p);
|
|
if (!p)
|
|
return &dummyContext;
|
|
else
|
|
return (__GLXcontext *) p;
|
|
}
|
|
}
|
|
|
|
_X_HIDDEN void
|
|
__glXSetCurrentContext(__GLXcontext * c)
|
|
{
|
|
if (!TSDinitialized) {
|
|
xthread_key_create(&ContextTSD, NULL);
|
|
TSDinitialized = GL_TRUE;
|
|
}
|
|
xthread_set_specific(ContextTSD, c);
|
|
}
|
|
|
|
|
|
/* Used by the __glXLock() and __glXUnlock() macros */
|
|
_X_HIDDEN xmutex_rec __glXmutex;
|
|
|
|
#elif 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, Bool pre13)
|
|
{
|
|
__GLXdisplayPrivate *const priv = __glXInitialize(dpy);
|
|
__GLXDRIdrawable *pdraw;
|
|
__GLXscreenConfigs *psc;
|
|
XID drawable;
|
|
|
|
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;
|
|
|
|
/* If this is glXMakeCurrent (pre GLX 1.3) we allow creating the
|
|
* GLX drawable on the fly. Otherwise we pass None as the X
|
|
* drawable */
|
|
if (pre13)
|
|
drawable = glxDrawable;
|
|
else
|
|
drawable = None;
|
|
|
|
pdraw = psc->driScreen->createDrawable(psc, drawable,
|
|
glxDrawable, gc->mode);
|
|
if (__glxHashInsert(psc->drawHash, glxDrawable, pdraw)) {
|
|
(*pdraw->destroyDrawable) (pdraw);
|
|
return NULL;
|
|
}
|
|
|
|
return pdraw;
|
|
}
|
|
#endif /* GLX_DIRECT_RENDERING */
|
|
|
|
|
|
/**
|
|
* 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, Bool pre13)
|
|
{
|
|
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;
|
|
}
|
|
|
|
_glapi_check_multithread();
|
|
|
|
#ifdef GLX_DIRECT_RENDERING
|
|
/* Bind the direct rendering context to the drawable */
|
|
if (gc && gc->driContext) {
|
|
__GLXDRIdrawable *pdraw = FetchDRIDrawable(dpy, draw, gc, pre13);
|
|
__GLXDRIdrawable *pread = FetchDRIDrawable(dpy, read, gc, pre13);
|
|
|
|
bindReturnValue =
|
|
(gc->driContext->bindContext) (gc->driContext, pdraw, pread);
|
|
}
|
|
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->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;
|
|
|
|
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;
|
|
|
|
#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, True);
|
|
}
|
|
|
|
PUBLIC
|
|
GLX_ALIAS(Bool, glXMakeCurrentReadSGI,
|
|
(Display * dpy, GLXDrawable d, GLXDrawable r, GLXContext ctx),
|
|
(dpy, d, r, ctx, False), MakeContextCurrent)
|
|
|
|
PUBLIC GLX_ALIAS(Bool, glXMakeContextCurrent,
|
|
(Display * dpy, GLXDrawable d, GLXDrawable r,
|
|
GLXContext ctx), (dpy, d, r, ctx, False),
|
|
MakeContextCurrent)
|