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mesa/src/glx/glxcurrent.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.
*/
/**
* \file glxcurrent.c
* Client-side GLX interface for current context management.
*/
#include <pthread.h>
#include "glxclient.h"
#include "glapi.h"
#include "glx_error.h"
/*
** 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];
static struct glx_context_vtable dummyVtable;
/*
** 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.
*/
struct glx_context dummyContext = {
&dummyBuffer[0],
&dummyBuffer[0],
&dummyBuffer[0],
&dummyBuffer[__GLX_BUFFER_LIMIT_SIZE],
sizeof(dummyBuffer),
&dummyVtable
};
/*
* Current context management and locking
*/
_X_HIDDEN pthread_mutex_t __glXmutex = PTHREAD_MUTEX_INITIALIZER;
# if defined( USE_ELF_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(struct glx_context * 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(struct glx_context * c)
{
pthread_once(&once_control, init_thread_data);
pthread_setspecific(ContextTSD, c);
}
_X_HIDDEN struct glx_context *
__glXGetCurrentContext(void)
{
void *v;
pthread_once(&once_control, init_thread_data);
v = pthread_getspecific(ContextTSD);
return (v == NULL) ? &dummyContext : (struct glx_context *) v;
}
# endif /* defined( USE_ELF_TLS ) */
_X_HIDDEN void
__glXSetCurrentContextNull(void)
{
__glXSetCurrentContext(&dummyContext);
#if defined(GLX_DIRECT_RENDERING)
_glapi_set_dispatch(NULL); /* no-op functions */
_glapi_set_context(NULL);
#endif
}
_GLX_PUBLIC GLXContext
glXGetCurrentContext(void)
{
struct glx_context *cx = __glXGetCurrentContext();
if (cx == &dummyContext) {
return NULL;
}
else {
return (GLXContext) cx;
}
}
_GLX_PUBLIC GLXDrawable
glXGetCurrentDrawable(void)
{
struct glx_context *gc = __glXGetCurrentContext();
return gc->currentDrawable;
}
static Bool
SendMakeCurrentRequest(Display * dpy, GLXContextID gc_id,
GLXContextTag gc_tag, GLXDrawable draw,
GLXDrawable read, GLXContextTag *out_tag)
{
xGLXMakeCurrentReply reply;
Bool ret;
int opcode = __glXSetupForCommand(dpy);
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 {
struct glx_display *priv = __glXInitialize(dpy);
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);
if (ret == 1)
*out_tag = reply.contextTag;
UnlockDisplay(dpy);
SyncHandle();
return ret;
}
static void
SetGC(struct glx_context *gc, Display *dpy, GLXDrawable draw, GLXDrawable read)
{
gc->currentDpy = dpy;
gc->currentDrawable = draw;
gc->currentReadable = read;
}
static Bool
should_send(Display *dpy, struct glx_context *gc)
{
/* always send for indirect contexts */
if (!gc->isDirect)
return 1;
/* don't send for broken servers. */
if (VendorRelease(dpy) < 12006000 || VendorRelease(dpy) >= 40000000)
return 0;
return 1;
}
static Bool
MakeContextCurrent(Display * dpy, GLXDrawable draw,
GLXDrawable read, GLXContext gc_user)
{
struct glx_context *gc = (struct glx_context *) gc_user;
struct glx_context *oldGC = __glXGetCurrentContext();
Bool ret = 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();
__glXLock();
if (oldGC == gc &&
gc->currentDrawable == draw &&
gc->currentReadable == read) {
/* Same context and drawables: no op, just return */
ret = GL_TRUE;
}
else if (oldGC == gc) {
/* Same context and new drawables: update drawable bindings */
if (should_send(dpy, gc)) {
if (!SendMakeCurrentRequest(dpy, gc->xid, gc->currentContextTag,
draw, read, &gc->currentContextTag)) {
goto out;
}
}
if (gc->vtable->bind(gc, gc, draw, read) != Success) {
__glXSetCurrentContextNull();
goto out;
}
}
else {
/* Different contexts: release the old, bind the new */
GLXContextTag oldTag = oldGC->currentContextTag;
if (oldGC != &dummyContext) {
if (--oldGC->thread_refcount == 0) {
if (oldGC->xid != None &&
should_send(dpy, oldGC) &&
!SendMakeCurrentRequest(dpy, None, oldTag, None, None,
&oldGC->currentContextTag)) {
goto out;
}
oldGC->vtable->unbind(oldGC, gc);
if (oldGC->xid == None) {
/* destroyed context, free it */
oldGC->vtable->destroy(oldGC);
oldTag = 0;
} else {
SetGC(oldGC, NULL, None, None);
oldTag = oldGC->currentContextTag;
}
}
}
__glXSetCurrentContextNull();
if (gc) {
/*
* MESA_multithread_makecurrent makes this complicated. We need to
* send the request if the new context is
*
* a) indirect (may be current to another client), or
* b) (direct and) newly being made current, or
* c) (direct and) being bound to new drawables
*/
Bool new_drawables = gc->currentReadable != read ||
gc->currentDrawable != draw;
if (should_send(dpy, gc)) {
if (!gc->isDirect || !gc->thread_refcount || new_drawables) {
if (!SendMakeCurrentRequest(dpy, gc->xid, oldTag, draw, read,
&gc->currentContextTag)) {
goto out;
}
}
}
if (gc->vtable->bind(gc, oldGC, draw, read) != Success) {
__glXSendError(dpy, GLXBadContext, None, X_GLXMakeContextCurrent,
False);
goto out;
}
if (gc->thread_refcount == 0) {
SetGC(gc, dpy, draw, read);
}
gc->thread_refcount++;
__glXSetCurrentContext(gc);
}
}
ret = GL_TRUE;
out:
__glXUnlock();
return ret;
}
_GLX_PUBLIC Bool
glXMakeCurrent(Display * dpy, GLXDrawable draw, GLXContext gc)
{
return MakeContextCurrent(dpy, draw, draw, gc);
}
_GLX_PUBLIC
GLX_ALIAS(Bool, glXMakeCurrentReadSGI,
(Display * dpy, GLXDrawable d, GLXDrawable r, GLXContext ctx),
(dpy, d, r, ctx), MakeContextCurrent)
_GLX_PUBLIC
GLX_ALIAS(Bool, glXMakeContextCurrent,
(Display * dpy, GLXDrawable d, GLXDrawable r,
GLXContext ctx), (dpy, d, r, ctx), MakeContextCurrent)
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