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27 * Generic utility functions to query internal data from the server.
29 * \author Ian Romanick <idr@us.ibm.com>
32 #include "glxclient.h"
35 # include <X11/Xlib-xcb.h>
43 * Exchange a protocol request for glXQueryServerString.
46 __glXQueryServerString(Display
* dpy
,
51 xcb_connection_t
*c
= XGetXCBConnection(dpy
);
52 xcb_glx_query_server_string_reply_t
* reply
=
53 xcb_glx_query_server_string_reply(c
,
54 xcb_glx_query_server_string(c
,
59 /* The spec doesn't mention this, but the Xorg server replies with
60 * a string already terminated with '\0'. */
61 uint32_t len
= xcb_glx_query_server_string_string_length(reply
);
62 char* buf
= Xmalloc(len
);
63 memcpy(buf
, xcb_glx_query_server_string_string(reply
), len
);
70 * Exchange a protocol request for glGetString.
73 __glXGetString(Display
* dpy
,
78 xcb_connection_t
*c
= XGetXCBConnection(dpy
);
79 xcb_glx_get_string_reply_t
* reply
=
80 xcb_glx_get_string_reply(c
,
86 /* The spec doesn't mention this, but the Xorg server replies with
87 * a string already terminated with '\0'. */
88 uint32_t len
= xcb_glx_get_string_string_length(reply
);
89 char* buf
= Xmalloc(len
);
90 memcpy(buf
, xcb_glx_get_string_string(reply
), len
);
99 * GLX protocol structure for the ficticious "GXLGenericGetString" request.
101 * This is a non-existant protocol packet. It just so happens that all of
102 * the real protocol packets used to request a string from the server have
103 * an identical binary layout. The only difference between them is the
104 * meaning of the \c for_whom field and the value of the \c glxCode.
106 typedef struct GLXGenericGetString
113 } xGLXGenericGetStringReq
;
115 /* These defines are only needed to make the GetReq macro happy.
117 #define sz_xGLXGenericGetStringReq 12
118 #define X_GLXGenericGetString 0
121 * Query the Server GLX string.
122 * This routine will allocate the necessay space for the string.
125 __glXGetStringFromServer(Display
* dpy
, int opcode
, CARD32 glxCode
,
126 CARD32 for_whom
, CARD32 name
)
128 xGLXGenericGetStringReq
*req
;
129 xGLXSingleReply reply
;
138 /* All of the GLX protocol requests for getting a string from the server
139 * look the same. The exact meaning of the for_whom field is usually
140 * either the screen number (for glXQueryServerString) or the context tag
144 GetReq(GLXGenericGetString
, req
);
145 req
->reqType
= opcode
;
146 req
->glxCode
= glxCode
;
147 req
->for_whom
= for_whom
;
150 _XReply(dpy
, (xReply
*) & reply
, 0, False
);
152 length
= reply
.length
* 4;
153 numbytes
= reply
.size
;
155 buf
= (char *) Xmalloc(numbytes
);
157 _XRead(dpy
, buf
, numbytes
);
161 _XEatData(dpy
, length
);
170 __glXQueryServerString(Display
* dpy
,
175 return __glXGetStringFromServer(dpy
, opcode
,
176 X_GLXQueryServerString
,
181 __glXGetString(Display
* dpy
,
186 return __glXGetStringFromServer(dpy
, opcode
, X_GLsop_GetString
,