[Xcb] Any xcb glx working examples?
nulleight
nulleight at gmail.com
Sun Jan 13 03:58:15 PST 2008
It doesn't use plain xcb, it uses XGetXCBConnection and not xcb_connect, the
only thing it does is manipulate lists using exisiting connection. As i
understand it Xlib-xcb is a backwards compatible xlib->xcb header. I mean
have anyone tried actually to create a program like in my example with
xcb_connect, then generating ids and creating a glx window? Also trying to
get an error crashes xserver. And the result was the same months back last I
tried it. Anyway i'd gladly take a peek at some code that uses xcb_glx
succesfully. As of now it doesn't seem to work at all.
Jeremy Kolb wrote:
>
> Mesa when compiled with the xcb target and used for indirect rendering
> uses a good chunk of xcb_glx.
>
> On Fri, 11 Jan 2008, nulleight wrote:
>
>>
>> The code still crashes my xserver if i uncomment it. Is there any code
>> that
>> actually uses xcb_glx?
>>
>> Regards, Konstantin.
>>
>>
>> nulleight wrote:
>>>
>>> Hi, I'm a guy who originally wrote this example and I found this forum
>>> while checking out if someone made my or similar code to work. I am
>>> running gentoo ~x86 everything compiled with "-O2 -pipe".
>>> xorg-server is ver. 1.4.0.90 and xcb 1.1. I tried this example also
>>> from
>>> time to time on older versions of xserver and xcb with the same result.
>>> This problem was not critical for me so i stayed with xlib code and It
>>> still works, which is also one of the reasons I haven't tried to debug
>>> xserver(it would take me probably a great deal of time just to become
>>> familiar with it). Anyway it would be interesting if someone from the
>>> more knowledgeble people would try the code out. I swapped out glxflush
>>> for glxfinish and tried to check for glx errors but it didn't change
>>> anything. I will try to uncommend the old code and see if it'll crash my
>>> xserver and report latelty. I'll send the example as an attachment.
>>> There
>>> are also kdevelop project files included.
>>>
>>> http://www.nabble.com/file/p14755626/glxexample.7z glxexample.7z
>>>
>>> Jeremy Kolb wrote:
>>>>
>>>> Adam Burton wrote:
>>>>> Hi,
>>>>> So far the only example I found is this,
>>>>> http://lists.freedesktop.org/archives/xcb/2007-July/002948.html
>>>>> which doesn't appear to work (although I see no reason why). If you
>>>>> look
>>>>> at
>>>>> the source it attempts to get gl errors (commented out) which crashes
>>>>> the
>>>>> XServer, I can confirm the same happens to me (in 1.0 and 1.1), in
>>>>> fact
>>>>> it
>>>>> also happens when using xcb_glx_finish.
>>>>> Using the x.h and x.c of the above example I converted the following
>>>>> ibm
>>>>> glx
>>>>> example to xcb and I run into the same problem (have attached my
>>>>> code).
>>>>> http://publib.boulder.ibm.com/infocenter/systems/index.jsp?topic=/com.ibm.aix.opengl/doc/openglrf/HowRenderXdraw.htm
>>>>>
>>>>> I realise the glx guy is on vacation so I don't expect a speedy
>>>>> response
>>>>> but
>>>>> any assistance is appreciated.
>>>>>
>>>>> Regards,
>>>>> Adam
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------------
>>>>>
>>>>> #include "GL/gl.h"
>>>>> #include "x.h"
>>>>>
>>>>> static int AttributeList[] = { GLX_RGBA, 0 };
>>>>>
>>>>> xcb_glx_context_t glxcontext;
>>>>> xcb_colormap_t xcolormap;
>>>>> xcb_window_t xwindow;
>>>>> xcb_glx_window_t glxwindow;
>>>>> xcb_glx_context_tag_t glxcontext_tag;
>>>>> int32_t screen_number;
>>>>> xcb_connection_t* xconnection;
>>>>> xcb_screen_t* xscreen;
>>>>>
>>>>> void setup_glx13() {
>>>>> /* Find a FBConfig that uses RGBA. Note that no attribute list is */
>>>>> /* needed since GLX_RGBA_BIT is a default attribute.*/
>>>>> uint32_t glxattribs[] = {
>>>>> GLX_DOUBLEBUFFER, 1,
>>>>> GLX_RED_SIZE, 8,
>>>>> GLX_GREEN_SIZE, 8,
>>>>> GLX_BLUE_SIZE, 8,
>>>>> GLX_ALPHA_SIZE, 8,
>>>>> GLX_STENCIL_SIZE, 8,
>>>>> GLX_DEPTH_SIZE, 24,
>>>>> GLX_BUFFER_SIZE, 32,
>>>>> GLX_RENDER_TYPE, GLX_RGBA_BIT,
>>>>> GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT |
>>>>> GLX_PIXMAP_BIT | GLX_PBUFFER_BIT,
>>>>> GLX_X_RENDERABLE, true
>>>>> };
>>>>>
>>>>> xcb_glx_fbconfig_t fbconfig = glx_choose_fbconfig( xconnection,
>>>>> screen_number, glxattribs, sizeof(glxattribs)/2/sizeof(uint32_t));
>>>>> xcb_visualid_t glxvisual = get_attrib_from_fbconfig( xconnection,
>>>>> screen_number, fbconfig, GLX_VISUAL_ID );
>>>>>
>>>>> /* Create a GLX context using the first FBConfig in the list. */
>>>>> xcb_glx_create_new_context( xconnection, glxcontext, fbconfig,
>>>>> screen_number, GLX_RGBA_TYPE, 0, true, 0, 0 );
>>>>>
>>>>> /* Create a colormap */
>>>>> xcb_create_colormap( xconnection , XCB_COLORMAP_ALLOC_NONE,
>>>>> xcolormap,
>>>>> xscreen->root, glxvisual );
>>>>>
>>>>> /* Create a window */
>>>>> uint32_t value_list[2], value_mask = XCB_CW_BACK_PIXEL |
>>>>> XCB_CW_COLORMAP ;
>>>>> value_list[0] = xscreen->white_pixel;
>>>>> value_list[1] = xcolormap;
>>>>>
>>>>> xcb_create_window( xconnection, xscreen->root_depth, xwindow,
>>>>> xscreen->root, 0, 0, 100, 100, 0,
>>>>>
>>>>> XCB_WINDOW_CLASS_INPUT_OUTPUT,
>>>>> glxvisual,
>>>>>
>>>>> value_mask,
>>>>> value_list
>>>>> );
>>>>> xcb_map_window( xconnection, xwindow );
>>>>> /* Create a GLX window using the same FBConfig that we used for the
>>>>> */
>>>>> /* the GLX context.
>>>>> */
>>>>> xcb_glx_create_window( xconnection, screen_number, fbconfig, xwindow,
>>>>> glxwindow, 0, 0);
>>>>> /* Connect the context to the window for read and write */
>>>>> xcb_glx_make_context_current_reply_t* reply_ctx =
>>>>> xcb_glx_make_context_current_reply ( xconnection,
>>>>> xcb_glx_make_context_current( xconnection, 0, glxwindow, glxwindow,
>>>>> glxcontext ), 0);
>>>>> glxcontext_tag = reply_ctx->context_tag;
>>>>> }
>>>>>
>>>>> int main(int argc, char **argv) {
>>>>>
>>>>> xconnection = xcb_connect( NULL, &screen_number );
>>>>>
>>>>> // getting the default screen
>>>>> xscreen = xcb_setup_roots_iterator( xcb_get_setup( xconnection
>>>>> )).data;
>>>>>
>>>>> glxcontext = xcb_generate_id( xconnection );
>>>>> xcolormap = xcb_generate_id( xconnection );
>>>>> xwindow = xcb_generate_id( xconnection );
>>>>> glxwindow = xcb_generate_id( xconnection );
>>>>>
>>>>> setup_glx13();
>>>>> xcb_flush(xconnection);
>>>>> /* clear the buffer */
>>>>> glClearColor(1,1,0,1);
>>>>> glClear(GL_COLOR_BUFFER_BIT);
>>>>> glFlush();
>>>>>
>>>>> //This kills xserver
>>>>> //xcb_glx_finish_reply_t* reply = xcb_glx_finish_reply(xconnection,
>>>>> xcb_glx_finish (xconnection, glxcontext_tag), 0);
>>>>>
>>>>> xcb_glx_swap_buffers( xconnection, glxcontext_tag, glxwindow );
>>>>>
>>>>> /* wait a while */
>>>>> sleep(10);
>>>>> }
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------------
>>>>>
>>>>> _______________________________________________
>>>>> Xcb mailing list
>>>>> Xcb at lists.freedesktop.org
>>>>> http://lists.freedesktop.org/mailman/listinfo/xcb
>>>>
>>>> My guess on the crash is that instead of doing xcb_glx_finish you
>>>> probably need to do glFinish as it probably does things that
>>>> xcb_glx_finish doesn't do. Also what are you using for GL
>>>> (mesa/nvidia/fglrx)? You'll have better luck if you stick to mesa
>>>> indirect rendering, probably compiled xcb support.
>>>>
>>>> Jeremy
>>>> _______________________________________________
>>>> Xcb mailing list
>>>> Xcb at lists.freedesktop.org
>>>> http://lists.freedesktop.org/mailman/listinfo/xcb
>>>>
>>>>
>>>
>>>
>>
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>>
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