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On 06/10/15 23:52, Jorge Fernandez Monteagudo wrote:<br>
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<pre wrap="">Hi,
I'm trying to share the main EGL context from my application and the glimagesink element
from the pipeline I'm implementing, using the 'other-context' field. I'm trying to paint the
texture with the video frame with my code.
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<br>
glimagesink in 1.6 does not have an 'other-context' property anymore
and so that information needs to be provided with GstContext. See <a
href="http://ystreet00.blogspot.com.au/2015/09/gstreamer-16-and-opengl-contexts.html"><a class="moz-txt-link-freetext" href="http://ystreet00.blogspot.com.au/2015/09/gstreamer-16-and-opengl-contexts.html">http://ystreet00.blogspot.com.au/2015/09/gstreamer-16-and-opengl-contexts.html</a></a>
for the details.<br>
<br>
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<pre wrap="">Now I have the next vars initialized ok (I can paint using gl commands)
EGLDisplay dpy;
EGLSurface surface;
EGLContext context;
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<br>
The question is if you can actually simply use the EGLDisplay
without first going through the winsys, wayland/X11/dispmanx/etc.
Android is the only platform that I know of that will allow using
the EGLDisplay natively without first having an existing display
connection. Essentially you must pass the winsys display handle if
you have it over the EGLDisplay handle.<br>
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<pre wrap="">and the 'eglMakeCurrent(dpy, surface, surface, context)' call returns success.
Then I set up the pipeline and the glimagesink with:
GstGLDisplay *glDisplay;
GstGLContext *glContext;
...
// Set glimagesink gl context.
eglMakeCurrent( dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT );
glDisplay = (GstGLDisplay *)gst_gl_display_egl_new_with_egl_display( dpy );
glContext = gst_gl_context_new_wrapped( glDisplay, (guintptr) context, GST_GL_PLATFORM_EGL, GST_GL_API_GLES1 );</pre>
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<br>
Just a note that we don't actually support the GST_GL_API_GLES1
API. If you're actually using GLES1-only api calls I'm afraid this
will not work at all.<br>
<br>
That should help you along the way.<br>
<br>
Cheers<br>
-Matt<br>
<br>
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<pre wrap=""> g_object_set( G_OBJECT(glimagesink), "other-context", glContext, NULL );
eglMakeCurrent( dpy, surface, surface, context );
printf( "glDisplay=%p glContext=%p\n", glDisplay, glContext );
When I run the code I see the printf trace
glDisplay=0x24c78 glContext=0x255848
and the backtrace
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x713fc460 (LWP 15929)]
__glInitFramebufferStates (gc=gc@entry=0x37b2ec) at src/glcore/gc_es_fbo.c:998
998 src/glcore/gc_es_fbo.c: No such file or directory.
(gdb) bt
#0 __glInitFramebufferStates (gc=gc@entry=0x37b2ec) at src/glcore/gc_es_fbo.c:998
#1 0x768cba1c in __glInitContextState (gc=gc@entry=0x37b2ec) at src/glcore/gc_es_context.c:702
#2 0x768cc048 in __glCreateContext (clientVersion=<optimized out>, imports=0x713fbc88, sharedCtx=0x22e974) at src/glcore/gc_es_context.c:1043
#3 0x76d1b504 in _CreateApiContext (Thread=Thread@entry=0x262204, Context=Context@entry=0x37b1cc, Config=0x1b5f0c, Config@entry=0x31be, SharedContext=0x22e974)
at gc_egl_context.c:593
#4 0x76d1bdf4 in eglCreateContext (Dpy=0x1b4204, config=<optimized out>, SharedContext=0x1b77dc, attrib_list=0x713fbd6c) at gc_egl_context.c:1385
Backtrace stopped: Cannot access memory at address 0x302a
Any hint?
Regards
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