[Xcb] Any xcb glx working examples?
nulleight
nulleight at gmail.com
Fri Jan 11 06:02:17 PST 2008
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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