212 lines
6.1 KiB
C
212 lines
6.1 KiB
C
/*
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* SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
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* Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice including the dates of first publication and
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* either this permission notice or a reference to
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* http://oss.sgi.com/projects/FreeB/
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* shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Except as contained in this notice, the name of Silicon Graphics, Inc.
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* shall not be used in advertising or otherwise to promote the sale, use or
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* other dealings in this Software without prior written authorization from
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* Silicon Graphics, Inc.
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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 <pthread.h>
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#include "glxclient.h"
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#include "glapi.h"
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#include "glx_error.h"
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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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static struct glx_context_vtable dummyVtable;
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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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struct glx_context 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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&dummyVtable
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};
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/*
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* Current context management and locking
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*/
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_X_HIDDEN pthread_mutex_t __glXmutex = PTHREAD_MUTEX_INITIALIZER;
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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_INITIAL_EXEC void *__glX_tls_Context = &dummyContext;
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_X_HIDDEN void
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__glXSetCurrentContext(struct glx_context * c)
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{
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__glX_tls_Context = (c != NULL) ? c : &dummyContext;
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}
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_X_HIDDEN void
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__glXSetCurrentContextNull(void)
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{
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__glXSetCurrentContext(&dummyContext);
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#if defined(GLX_DIRECT_RENDERING)
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_glapi_set_dispatch(NULL); /* no-op functions */
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_glapi_set_context(NULL);
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#endif
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}
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_GLX_PUBLIC GLXContext
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glXGetCurrentContext(void)
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{
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struct glx_context *cx = __glXGetCurrentContext();
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if (cx == &dummyContext) {
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return NULL;
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}
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else {
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return (GLXContext) cx;
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}
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}
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_GLX_PUBLIC GLXDrawable
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glXGetCurrentDrawable(void)
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{
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struct glx_context *gc = __glXGetCurrentContext();
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return gc->currentDrawable;
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}
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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
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MakeContextCurrent(Display * dpy, GLXDrawable draw,
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GLXDrawable read, GLXContext gc_user,
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int opcode)
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{
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struct glx_context *gc = (struct glx_context *) gc_user;
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struct glx_context *oldGC = __glXGetCurrentContext();
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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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__glXLock();
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if (oldGC == gc &&
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gc->currentDrawable == draw && gc->currentReadable == read) {
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__glXUnlock();
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return True;
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}
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/* can't have only one be 0 */
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if (!!draw != !!read) {
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__glXUnlock();
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__glXSendError(dpy, BadMatch, None, opcode, True);
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return False;
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}
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if (oldGC != &dummyContext) {
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oldGC->vtable->unbind(oldGC, gc);
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oldGC->currentDpy = NULL;
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}
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if (gc) {
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/* Attempt to bind the context. We do this before mucking with
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* gc and __glXSetCurrentContext to properly handle our state in
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* case of an error.
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*
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* If an error occurs, set the Null context since we've already
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* blown away our old context. The caller is responsible for
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* figuring out how to handle setting a valid context.
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*/
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if (gc->vtable->bind(gc, oldGC, draw, read) != Success) {
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__glXSetCurrentContextNull();
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__glXUnlock();
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__glXSendError(dpy, GLXBadContext, None, opcode, False);
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return GL_FALSE;
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}
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gc->currentDpy = dpy;
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gc->currentDrawable = draw;
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gc->currentReadable = read;
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__glXSetCurrentContext(gc);
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} else {
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__glXSetCurrentContextNull();
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}
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if (oldGC->currentDpy == NULL && oldGC != &dummyContext && 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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oldGC->vtable->destroy(oldGC);
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}
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__glXUnlock();
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return GL_TRUE;
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}
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_GLX_PUBLIC Bool
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glXMakeCurrent(Display * dpy, GLXDrawable draw, GLXContext gc)
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{
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return MakeContextCurrent(dpy, draw, draw, gc, X_GLXMakeCurrent);
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}
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_GLX_PUBLIC Bool
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glXMakeContextCurrent(Display *dpy, GLXDrawable d, GLXDrawable r,
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GLXContext ctx)
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{
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return MakeContextCurrent(dpy, d, r, ctx, X_GLXMakeContextCurrent);
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}
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_GLX_PUBLIC Bool
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glXMakeCurrentReadSGI(Display *dpy, GLXDrawable d, GLXDrawable r,
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GLXContext ctx)
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{
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return MakeContextCurrent(dpy, d, r, ctx, X_GLXvop_MakeCurrentReadSGI);
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}
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