| /* |
| * (C) Copyright IBM Corporation 2004 |
| * 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 |
| * on the rights to use, copy, modify, merge, publish, distribute, sub |
| * license, 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 and this permission notice (including the next |
| * paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL |
| * IBM AND/OR THEIR SUPPLIERS 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. |
| */ |
| |
| /** |
| * \file glx_query.c |
| * Generic utility functions to query internal data from the server. |
| * |
| * \author Ian Romanick <idr@us.ibm.com> |
| */ |
| |
| #include "glxclient.h" |
| |
| /** |
| * GLX protocol structure for the ficticious "GXLGenericGetString" request. |
| * |
| * This is a non-existant protocol packet. It just so happens that all of |
| * the real protocol packets used to request a string from the server have |
| * an identical binary layout. The only difference between them is the |
| * meaning of the \c for_whom field and the value of the \c glxCode. |
| */ |
| typedef struct GLXGenericGetString { |
| CARD8 reqType; |
| CARD8 glxCode; |
| CARD16 length B16; |
| CARD32 for_whom B32; |
| CARD32 name B32; |
| } xGLXGenericGetStringReq; |
| |
| /* These defines are only needed to make the GetReq macro happy. |
| */ |
| #define sz_xGLXGenericGetStringReq 12 |
| #define X_GLXGenericGetString 0 |
| |
| /** |
| * Query the Server GLX string and cache it in the display private. |
| * This routine will allocate the necessay space for the string. |
| */ |
| char * |
| __glXGetStringFromServer( Display * dpy, int opcode, CARD32 glxCode, |
| CARD32 for_whom, CARD32 name ) |
| { |
| xGLXGenericGetStringReq *req; |
| xGLXSingleReply reply; |
| int length; |
| int numbytes; |
| char * buf; |
| |
| |
| LockDisplay( dpy ); |
| |
| |
| /* All of the GLX protocol requests for getting a string from the server |
| * look the same. The exact meaning of the for_whom field is usually |
| * either the screen number (for glXQueryServerString) or the context tag |
| * (for GLXSingle). |
| */ |
| |
| GetReq( GLXGenericGetString, req ); |
| req->reqType = opcode; |
| req->glxCode = glxCode; |
| req->for_whom = for_whom; |
| req->name = name; |
| |
| _XReply( dpy, (xReply *) & reply, 0, False ); |
| |
| length = reply.length * 4; |
| numbytes = reply.size; |
| |
| buf = (char *) Xmalloc( numbytes ); |
| if ( buf != NULL ) { |
| _XRead( dpy, buf, numbytes ); |
| length -= numbytes; |
| } |
| |
| _XEatData( dpy, length ); |
| |
| UnlockDisplay( dpy ); |
| SyncHandle(); |
| |
| return buf; |
| } |