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Diffstat (limited to 'src/glx/x11/glxcurrent.c')
| -rw-r--r-- | src/glx/x11/glxcurrent.c | 518 |
1 files changed, 518 insertions, 0 deletions
diff --git a/src/glx/x11/glxcurrent.c b/src/glx/x11/glxcurrent.c new file mode 100644 index 00000000000..0d0c419a846 --- /dev/null +++ b/src/glx/x11/glxcurrent.c @@ -0,0 +1,518 @@ +/* +** License Applicability. Except to the extent portions of this file are +** made subject to an alternative license as permitted in the SGI Free +** Software License B, Version 1.1 (the "License"), the contents of this +** file are subject only to the provisions of the License. You may not use +** this file except in compliance with the License. You may obtain a copy +** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 +** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: +** +** http://oss.sgi.com/projects/FreeB +** +** Note that, as provided in the License, the Software is distributed on an +** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS +** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND +** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A +** PARTICULAR PURPOSE, AND NON-INFRINGEMENT. +** +** Original Code. The Original Code is: OpenGL Sample Implementation, +** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, +** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. +** Copyright in any portions created by third parties is as indicated +** elsewhere herein. All Rights Reserved. +** +** Additional Notice Provisions: The application programming interfaces +** established by SGI in conjunction with the Original Code are The +** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released +** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version +** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X +** Window System(R) (Version 1.3), released October 19, 1998. This software +** was created using the OpenGL(R) version 1.2.1 Sample Implementation +** published by SGI, but has not been independently verified as being +** compliant with the OpenGL(R) version 1.2.1 Specification. +** +*/ + +/** + * \file glxcurrent.c + * Client-side GLX interface for current context management. + */ + +#include "glxclient.h" +#include "glapi.h" +#include "glheader.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; + + + 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 + + __GLXattribute *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) |