https://bugs.freedesktop.org/show_bug.cgi?id=32285
--- Comment #2 from Jammy Zhou <jammy.z...@linaro.org> 2010-12-09 23:44:34 PST --- (In reply to comment #1) Thanks for the quick response and detailed explanation. > Created an attachment (id=40980) View: https://bugs.freedesktop.org/attachment.cgi?id=40980 Review: https://bugs.freedesktop.org/review?bug=32285&attachment=40980 > hack to work > > It may depend on your setup and the dynamic linker, but this patch to > renderer_info.c may "fix" the issue, even with the "failed to remap ..." > messages. Or alternatively, you can try linking to libGL.so directly when > compiling and call glGetString directly. With this patch, both GL and GLESv2 renderer info can be got successfully now. But this seems a little tricky, and in this case the dispatch table of GLESv2 is also used for OpenGL/GLX context. I am curious why "dlclose(gles2_handle);" didn't clean libGLESv2.so out of the address space? By the way, because I want to make my application independent of both libGL and libGLESv2, I cannot link it directly to libGL.so or libGLESv2.so. > > The bug here is that there are two copies of glapi: one in libGL.so and the > other in libGLESv2.so. One of the things that glapi does is to manage the > dispatch table of the current context. When the OpenGL ES context is first > made current, the dispatch table in libGLESv2.so is updated. Calling > glGetString from libGLESv2.so gives the correct result. > > But when the OpenGL context is made current, the dynamic linker decides to > update the dispatch table in libGLESv2.so again. If you call glGetString from > libGL.so, it will be no-op since the dispatch table in libGL.so is never > updated. > > For the same reason, when the OpenGL context is created, the remap table in > libGLESv2.so is updated. Since OpenGL has much more entry points than > libGLESv2.so can handle, you will see the "failed to remap ..." messages after > the entry points in libGLESv2.so run out. Hmm... resonable > > 16ee7a55ae26 only fixed core mesa (src/mesa/). It will only work when an app > links to either one of libGL.so or libGLESv2.so, and use eglGetProcAddress to > get the addresses of the entry points that are not statically available. > > But when both libGL.so and libGLESv2.so are used, the app will be affected by > this bug. A fix to glapi (src/mapi/glapi/) is required. -- Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
