1 /* 2 * (C) Copyright IBM Corporation 2004 3 * All Rights Reserved. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * on the rights to use, copy, modify, merge, publish, distribute, sub 9 * license, and/or sell copies of the Software, and to permit persons to whom 10 * the Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the next 13 * paragraph) shall be included in all copies or substantial portions of the 14 * Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 19 * IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 * DEALINGS IN THE SOFTWARE. 23 */ 24 25 /** 26 * \file glx_query.c 27 * Generic utility functions to query internal data from the server. 28 * 29 * \author Ian Romanick <idr (at) us.ibm.com> 30 */ 31 32 #include "glxclient.h" 33 34 #if defined(USE_XCB) 35 # include <X11/Xlib-xcb.h> 36 # include <xcb/xcb.h> 37 # include <xcb/glx.h> 38 #endif 39 40 #ifdef USE_XCB 41 42 /** 43 * Exchange a protocol request for glXQueryServerString. 44 */ 45 char * 46 __glXQueryServerString(Display * dpy, int opcode, CARD32 screen, CARD32 name) 47 { 48 xcb_connection_t *c = XGetXCBConnection(dpy); 49 xcb_glx_query_server_string_reply_t *reply = 50 xcb_glx_query_server_string_reply(c, 51 xcb_glx_query_server_string(c, 52 screen, 53 name), 54 NULL); 55 56 /* The spec doesn't mention this, but the Xorg server replies with 57 * a string already terminated with '\0'. */ 58 uint32_t len = xcb_glx_query_server_string_string_length(reply); 59 char *buf = Xmalloc(len); 60 memcpy(buf, xcb_glx_query_server_string_string(reply), len); 61 free(reply); 62 63 return buf; 64 } 65 66 /** 67 * Exchange a protocol request for glGetString. 68 */ 69 char * 70 __glXGetString(Display * dpy, int opcode, CARD32 contextTag, CARD32 name) 71 { 72 xcb_connection_t *c = XGetXCBConnection(dpy); 73 xcb_glx_get_string_reply_t *reply = xcb_glx_get_string_reply(c, 74 xcb_glx_get_string 75 (c, 76 contextTag, 77 name), 78 NULL); 79 80 /* The spec doesn't mention this, but the Xorg server replies with 81 * a string already terminated with '\0'. */ 82 uint32_t len = xcb_glx_get_string_string_length(reply); 83 char *buf = Xmalloc(len); 84 memcpy(buf, xcb_glx_get_string_string(reply), len); 85 free(reply); 86 87 return buf; 88 } 89 90 #else 91 92 /** 93 * GLX protocol structure for the ficticious "GXLGenericGetString" request. 94 * 95 * This is a non-existant protocol packet. It just so happens that all of 96 * the real protocol packets used to request a string from the server have 97 * an identical binary layout. The only difference between them is the 98 * meaning of the \c for_whom field and the value of the \c glxCode. 99 */ 100 typedef struct GLXGenericGetString 101 { 102 CARD8 reqType; 103 CARD8 glxCode; 104 CARD16 length B16; 105 CARD32 for_whom B32; 106 CARD32 name B32; 107 } xGLXGenericGetStringReq; 108 109 /* These defines are only needed to make the GetReq macro happy. 110 */ 111 #define sz_xGLXGenericGetStringReq 12 112 #define X_GLXGenericGetString 0 113 114 /** 115 * Query the Server GLX string. 116 * This routine will allocate the necessay space for the string. 117 */ 118 static char * 119 __glXGetStringFromServer(Display * dpy, int opcode, CARD32 glxCode, 120 CARD32 for_whom, CARD32 name) 121 { 122 xGLXGenericGetStringReq *req; 123 xGLXSingleReply reply; 124 int length; 125 int numbytes; 126 char *buf; 127 128 129 LockDisplay(dpy); 130 131 132 /* All of the GLX protocol requests for getting a string from the server 133 * look the same. The exact meaning of the for_whom field is usually 134 * either the screen number (for glXQueryServerString) or the context tag 135 * (for GLXSingle). 136 */ 137 138 GetReq(GLXGenericGetString, req); 139 req->reqType = opcode; 140 req->glxCode = glxCode; 141 req->for_whom = for_whom; 142 req->name = name; 143 144 _XReply(dpy, (xReply *) & reply, 0, False); 145 146 length = reply.length * 4; 147 numbytes = reply.size; 148 149 buf = (char *) Xmalloc(numbytes); 150 if (buf != NULL) { 151 _XRead(dpy, buf, numbytes); 152 length -= numbytes; 153 } 154 155 _XEatData(dpy, length); 156 157 UnlockDisplay(dpy); 158 SyncHandle(); 159 160 return buf; 161 } 162 163 char * 164 __glXQueryServerString(Display * dpy, int opcode, CARD32 screen, CARD32 name) 165 { 166 return __glXGetStringFromServer(dpy, opcode, 167 X_GLXQueryServerString, screen, name); 168 } 169 170 char * 171 __glXGetString(Display * dpy, int opcode, CARD32 contextTag, CARD32 name) 172 { 173 return __glXGetStringFromServer(dpy, opcode, X_GLsop_GetString, 174 contextTag, name); 175 } 176 177 #endif /* USE_XCB */ 178