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/*
* (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"
#if defined(USE_XCB)
# include <X11/Xlib-xcb.h>
# include <xcb/xcb.h>
# include <xcb/glx.h>
#endif
#ifdef USE_XCB
/**
* Exchange a protocol request for glXQueryServerString.
*/
char *
__glXQueryServerString(Display* dpy,
CARD32 screen,
CARD32 name)
{
xcb_connection_t *c = XGetXCBConnection(dpy);
xcb_glx_query_server_string_reply_t* reply =
xcb_glx_query_server_string_reply(c,
xcb_glx_query_server_string(c,
screen,
name),
NULL);
/* The spec doesn't mention this, but the Xorg server replies with
* a string already terminated with '\0'. */
uint32_t len = xcb_glx_query_server_string_string_length(reply);
char* buf = Xmalloc(len);
memcpy(buf, xcb_glx_query_server_string_string(reply), len);
free(reply);
return buf;
}
/**
* Exchange a protocol request for glGetString.
*/
char *
__glXGetString(Display* dpy,
CARD32 contextTag,
CARD32 name)
{
xcb_connection_t *c = XGetXCBConnection(dpy);
xcb_glx_get_string_reply_t* reply =
xcb_glx_get_string_reply(c,
xcb_glx_get_string(c,
contextTag,
name),
NULL);
/* The spec doesn't mention this, but the Xorg server replies with
* a string already terminated with '\0'. */
uint32_t len = xcb_glx_get_string_string_length(reply);
char* buf = Xmalloc(len);
memcpy(buf, xcb_glx_get_string_string(reply), len);
free(reply);
return buf;
}
#else
/**
* 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.
* This routine will allocate the necessay space for the string.
*/
static 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;
}
char *
__glXQueryServerString(Display* dpy,
CARD32 screen,
CARD32 name)
{
GLXContext gc = __glXGetCurrentContext();
return __glXGetStringFromServer(dpy, gc->majorOpcode,
X_GLXQueryServerString,
screen, name);
}
char *
__glXGetString(Display* dpy,
CARD32 contextTag,
CARD32 name)
{
GLXContext gc = __glXGetCurrentContext();
return __glXGetStringFromServer(dpy, gc->majorOpcode, X_GLsop_GetString,
contextTag, name);
}
#endif /* USE_XCB */
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