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Diffstat (limited to 'src/glx/glx_query.c')
-rw-r--r-- | src/glx/glx_query.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/src/glx/glx_query.c b/src/glx/glx_query.c new file mode 100644 index 00000000000..efad13d376e --- /dev/null +++ b/src/glx/glx_query.c @@ -0,0 +1,177 @@ +/* + * (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 <[email protected]> + */ + +#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, int opcode, 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, int opcode, 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, int opcode, CARD32 screen, CARD32 name) +{ + return __glXGetStringFromServer(dpy, opcode, + X_GLXQueryServerString, screen, name); +} + +char * +__glXGetString(Display * dpy, int opcode, CARD32 contextTag, CARD32 name) +{ + return __glXGetStringFromServer(dpy, opcode, X_GLsop_GetString, + contextTag, name); +} + +#endif /* USE_XCB */ |