1 files changed, 102 insertions, 0 deletions
diff --git a/src/glx/x11/glx_query.c b/src/glx/x11/glx_query.c
new file mode 100644
index 0000000000..e93cd2afd4
--- /dev/null
+++ b/src/glx/x11/glx_query.c
@@ -0,0 +1,102 @@
+/*
+ * (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;
+}