mirror of https://gitlab.freedesktop.org/mesa/mesa
511 lines
14 KiB
C
511 lines
14 KiB
C
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/*
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** License Applicability. Except to the extent portions of this file are
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** made subject to an alternative license as permitted in the SGI Free
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** Software License B, Version 1.1 (the "License"), the contents of this
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** file are subject only to the provisions of the License. You may not use
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** this file except in compliance with the License. You may obtain a copy
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** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
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** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
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**
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** http://oss.sgi.com/projects/FreeB
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**
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** Note that, as provided in the License, the Software is distributed on an
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** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
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** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
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** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
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** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
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**
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** Original Code. The Original Code is: OpenGL Sample Implementation,
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** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
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** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
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** Copyright in any portions created by third parties is as indicated
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** elsewhere herein. All Rights Reserved.
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**
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** Additional Notice Provisions: The application programming interfaces
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** established by SGI in conjunction with the Original Code are The
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** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
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** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
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** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
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** Window System(R) (Version 1.3), released October 19, 1998. This software
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** was created using the OpenGL(R) version 1.2.1 Sample Implementation
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** published by SGI, but has not been independently verified as being
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** compliant with the OpenGL(R) version 1.2.1 Specification.
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**
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*/
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/**
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* \file glxcurrent.c
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* Client-side GLX interface for current context management.
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*/
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#include "glxclient.h"
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#include "glapi.h"
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#include "glheader.h"
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#include "indirect_init.h"
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#ifdef GLX_DIRECT_RENDERING
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#include "xf86dri.h"
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#endif
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/*
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** We setup some dummy structures here so that the API can be used
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** even if no context is current.
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*/
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static GLubyte dummyBuffer[__GLX_BUFFER_LIMIT_SIZE];
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/*
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** Dummy context used by small commands when there is no current context.
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** All the
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** gl and glx entry points are designed to operate as nop's when using
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** the dummy context structure.
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*/
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static __GLXcontext dummyContext = {
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&dummyBuffer[0],
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&dummyBuffer[0],
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&dummyBuffer[0],
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&dummyBuffer[__GLX_BUFFER_LIMIT_SIZE],
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sizeof(dummyBuffer),
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};
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/*
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** All indirect rendering contexts will share the same indirect dispatch table.
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*/
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static __GLapi *IndirectAPI = NULL;
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/*
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* Current context management and locking
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*/
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#if defined( USE_XTHREADS )
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/* thread safe */
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static GLboolean TSDinitialized = GL_FALSE;
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static xthread_key_t ContextTSD;
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_X_HIDDEN __GLXcontext *__glXGetCurrentContext(void)
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{
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if (!TSDinitialized) {
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xthread_key_create(&ContextTSD, NULL);
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TSDinitialized = GL_TRUE;
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return &dummyContext;
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}
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else {
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void *p;
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xthread_get_specific(ContextTSD, &p);
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if (!p)
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return &dummyContext;
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else
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return (__GLXcontext *) p;
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}
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}
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_X_HIDDEN void __glXSetCurrentContext(__GLXcontext *c)
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{
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if (!TSDinitialized) {
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xthread_key_create(&ContextTSD, NULL);
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TSDinitialized = GL_TRUE;
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}
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xthread_set_specific(ContextTSD, c);
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}
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/* Used by the __glXLock() and __glXUnlock() macros */
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_X_HIDDEN xmutex_rec __glXmutex;
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#elif defined( PTHREADS )
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_X_HIDDEN pthread_mutex_t __glXmutex = PTHREAD_MUTEX_INITIALIZER;
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# if defined( GLX_USE_TLS )
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/**
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* Per-thread GLX context pointer.
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*
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* \c __glXSetCurrentContext is written is such a way that this pointer can
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* \b never be \c NULL. This is important! Because of this
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* \c __glXGetCurrentContext can be implemented as trivial macro.
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*/
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__thread void * __glX_tls_Context __attribute__((tls_model("initial-exec")))
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= &dummyContext;
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_X_HIDDEN void __glXSetCurrentContext( __GLXcontext * c )
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{
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__glX_tls_Context = (c != NULL) ? c : &dummyContext;
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}
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# else
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static pthread_once_t once_control = PTHREAD_ONCE_INIT;
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/**
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* Per-thread data key.
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*
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* Once \c init_thread_data has been called, the per-thread data key will
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* take a value of \c NULL. As each new thread is created the default
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* value, in that thread, will be \c NULL.
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*/
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static pthread_key_t ContextTSD;
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/**
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* Initialize the per-thread data key.
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*
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* This function is called \b exactly once per-process (not per-thread!) to
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* initialize the per-thread data key. This is ideally done using the
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* \c pthread_once mechanism.
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*/
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static void init_thread_data( void )
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{
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if ( pthread_key_create( & ContextTSD, NULL ) != 0 ) {
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perror( "pthread_key_create" );
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exit( -1 );
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}
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}
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_X_HIDDEN void __glXSetCurrentContext( __GLXcontext * c )
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{
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pthread_once( & once_control, init_thread_data );
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pthread_setspecific( ContextTSD, c );
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}
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_X_HIDDEN __GLXcontext * __glXGetCurrentContext( void )
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{
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void * v;
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pthread_once( & once_control, init_thread_data );
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v = pthread_getspecific( ContextTSD );
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return (v == NULL) ? & dummyContext : (__GLXcontext *) v;
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}
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# endif /* defined( GLX_USE_TLS ) */
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#elif defined( THREADS )
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#error Unknown threading method specified.
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#else
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/* not thread safe */
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_X_HIDDEN __GLXcontext *__glXcurrentContext = &dummyContext;
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#endif
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_X_HIDDEN void __glXSetCurrentContextNull(void)
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{
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__glXSetCurrentContext(&dummyContext);
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#ifdef GLX_DIRECT_RENDERING
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_glapi_set_dispatch(NULL); /* no-op functions */
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#endif
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}
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/************************************************************************/
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PUBLIC GLXContext glXGetCurrentContext(void)
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{
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GLXContext cx = __glXGetCurrentContext();
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if (cx == &dummyContext) {
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return NULL;
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} else {
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return cx;
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}
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}
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PUBLIC GLXDrawable glXGetCurrentDrawable(void)
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{
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GLXContext gc = __glXGetCurrentContext();
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return gc->currentDrawable;
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}
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/************************************************************************/
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/**
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* Sends a GLX protocol message to the specified display to make the context
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* and the drawables current.
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*
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* \param dpy Display to send the message to.
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* \param opcode Major opcode value for the display.
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* \param gc_id Context tag for the context to be made current.
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* \param draw Drawable ID for the "draw" drawable.
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* \param read Drawable ID for the "read" drawable.
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* \param reply Space to store the X-server's reply.
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*
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* \warning
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* This function assumes that \c dpy is locked with \c LockDisplay on entry.
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*/
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static Bool SendMakeCurrentRequest(Display *dpy, CARD8 opcode,
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GLXContextID gc_id, GLXContextTag gc_tag,
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GLXDrawable draw, GLXDrawable read,
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xGLXMakeCurrentReply *reply)
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{
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Bool ret;
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LockDisplay(dpy);
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if (draw == read) {
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xGLXMakeCurrentReq *req;
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GetReq(GLXMakeCurrent,req);
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req->reqType = opcode;
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req->glxCode = X_GLXMakeCurrent;
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req->drawable = draw;
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req->context = gc_id;
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req->oldContextTag = gc_tag;
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}
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else {
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__GLXdisplayPrivate *priv = __glXInitialize(dpy);
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/* If the server can support the GLX 1.3 version, we should
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* perfer that. Not only that, some servers support GLX 1.3 but
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* not the SGI extension.
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*/
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if ((priv->majorVersion > 1) || (priv->minorVersion >= 3)) {
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xGLXMakeContextCurrentReq *req;
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GetReq(GLXMakeContextCurrent,req);
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req->reqType = opcode;
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req->glxCode = X_GLXMakeContextCurrent;
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req->drawable = draw;
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req->readdrawable = read;
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req->context = gc_id;
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req->oldContextTag = gc_tag;
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}
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else {
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xGLXVendorPrivateWithReplyReq *vpreq;
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xGLXMakeCurrentReadSGIReq *req;
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GetReqExtra(GLXVendorPrivateWithReply,
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sz_xGLXMakeCurrentReadSGIReq-sz_xGLXVendorPrivateWithReplyReq,vpreq);
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req = (xGLXMakeCurrentReadSGIReq *)vpreq;
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req->reqType = opcode;
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req->glxCode = X_GLXVendorPrivateWithReply;
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req->vendorCode = X_GLXvop_MakeCurrentReadSGI;
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req->drawable = draw;
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req->readable = read;
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req->context = gc_id;
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req->oldContextTag = gc_tag;
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}
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}
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ret = _XReply(dpy, (xReply*) reply, 0, False);
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UnlockDisplay(dpy);
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SyncHandle();
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return ret;
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}
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#ifdef GLX_DIRECT_RENDERING
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static __GLXDRIdrawable *
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FetchDRIDrawable(Display *dpy,
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GLXDrawable glxDrawable, GLXContext gc, Bool pre13)
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{
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__GLXdisplayPrivate * const priv = __glXInitialize(dpy);
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__GLXDRIdrawable *pdraw;
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__GLXscreenConfigs *psc;
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XID drawable;
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if (priv == NULL)
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return NULL;
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psc = &priv->screenConfigs[gc->screen];
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if (psc->drawHash == NULL)
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return NULL;
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if (__glxHashLookup(psc->drawHash, glxDrawable, (void *) &pdraw) == 0)
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return pdraw;
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/* If this is glXMakeCurrent (pre GLX 1.3) we allow creating the
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* GLX drawable on the fly. Otherwise we pass None as the X
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* drawable */
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if (pre13)
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drawable = glxDrawable;
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else
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drawable = None;
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pdraw = psc->driScreen->createDrawable(psc, drawable,
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glxDrawable, gc->mode);
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if (__glxHashInsert(psc->drawHash, glxDrawable, pdraw)) {
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(*pdraw->destroyDrawable)(pdraw);
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return NULL;
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}
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return pdraw;
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}
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#endif /* GLX_DIRECT_RENDERING */
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/**
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* Make a particular context current.
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*
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* \note This is in this file so that it can access dummyContext.
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*/
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static Bool MakeContextCurrent(Display *dpy, GLXDrawable draw,
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GLXDrawable read, GLXContext gc,
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Bool pre13)
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{
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xGLXMakeCurrentReply reply;
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const GLXContext oldGC = __glXGetCurrentContext();
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const CARD8 opcode = __glXSetupForCommand(dpy);
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const CARD8 oldOpcode = ((gc == oldGC) || (oldGC == &dummyContext))
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? opcode : __glXSetupForCommand(oldGC->currentDpy);
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Bool bindReturnValue;
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if (!opcode || !oldOpcode) {
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return GL_FALSE;
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}
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/* Make sure that the new context has a nonzero ID. In the request,
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* a zero context ID is used only to mean that we bind to no current
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* context.
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*/
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if ((gc != NULL) && (gc->xid == None)) {
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return GL_FALSE;
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}
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_glapi_check_multithread();
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#ifdef GLX_DIRECT_RENDERING
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/* Bind the direct rendering context to the drawable */
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if (gc && gc->driContext) {
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__GLXDRIdrawable *pdraw = FetchDRIDrawable(dpy, draw, gc, pre13);
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__GLXDRIdrawable *pread = FetchDRIDrawable(dpy, read, gc, pre13);
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bindReturnValue =
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(gc->driContext->bindContext) (gc->driContext, pdraw, pread);
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} else
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#endif
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{
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/* Send a glXMakeCurrent request to bind the new context. */
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bindReturnValue =
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SendMakeCurrentRequest(dpy, opcode, gc ? gc->xid : None,
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((dpy != oldGC->currentDpy) || oldGC->isDirect)
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? None : oldGC->currentContextTag,
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draw, read, &reply);
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}
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if (!bindReturnValue) {
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return False;
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}
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if ((dpy != oldGC->currentDpy || (gc && gc->driContext)) &&
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!oldGC->isDirect && oldGC != &dummyContext) {
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xGLXMakeCurrentReply dummy_reply;
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/* We are either switching from one dpy to another and have to
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* send a request to the previous dpy to unbind the previous
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* context, or we are switching away from a indirect context to
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* a direct context and have to send a request to the dpy to
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* unbind the previous context.
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*/
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(void) SendMakeCurrentRequest(oldGC->currentDpy, oldOpcode, None,
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oldGC->currentContextTag, None, None,
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& dummy_reply);
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}
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#ifdef GLX_DIRECT_RENDERING
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else if (oldGC->driContext) {
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oldGC->driContext->unbindContext(oldGC->driContext);
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}
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#endif
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/* Update our notion of what is current */
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__glXLock();
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if (gc == oldGC) {
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/* Even though the contexts are the same the drawable might have
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* changed. Note that gc cannot be the dummy, and that oldGC
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* cannot be NULL, therefore if they are the same, gc is not
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* NULL and not the dummy.
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*/
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gc->currentDrawable = draw;
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gc->currentReadable = read;
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} else {
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if (oldGC != &dummyContext) {
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/* Old current context is no longer current to anybody */
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oldGC->currentDpy = 0;
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oldGC->currentDrawable = None;
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oldGC->currentReadable = None;
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oldGC->currentContextTag = 0;
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if (oldGC->xid == None) {
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/* We are switching away from a context that was
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* previously destroyed, so we need to free the memory
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* for the old handle.
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*/
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#ifdef GLX_DIRECT_RENDERING
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/* 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;
|
||
|
|
||
|
if (!gc->driContext) {
|
||
|
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);
|
||
|
}
|
||
|
}
|
||
|
else {
|
||
|
gc->currentContextTag = -1;
|
||
|
}
|
||
|
} 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)
|