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Diffstat (limited to 'src/glx/glxcurrent.c')
| -rw-r--r-- | src/glx/glxcurrent.c | 513 |
1 files changed, 513 insertions, 0 deletions
diff --git a/src/glx/glxcurrent.c b/src/glx/glxcurrent.c new file mode 100644 index 0000000000..c28360bdde --- /dev/null +++ b/src/glx/glxcurrent.c @@ -0,0 +1,513 @@ +/* + * 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" + +/* +** 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 */ + _glapi_set_context(NULL); +#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); + + 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) |