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@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 *
__glXQueryServerString(Display * dpy,int opcode,CARD32 screen,CARD32 name)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 *
__glXGetString(Display * dpy,int opcode,CARD32 contextTag,CARD32 name)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 *
__glXGetStringFromServer(Display * dpy,int opcode,CARD32 glxCode,CARD32 for_whom,CARD32 name)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 *
__glXQueryServerString(Display * dpy,int opcode,CARD32 screen,CARD32 name)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 *
__glXGetString(Display * dpy,int opcode,CARD32 contextTag,CARD32 name)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