This seems tangentially related to the recent MATLAB post on users@.
Obviously this is only a band-aid for the potential general issue
(assuming extensions exist in the 3D X server without actually
checking), but it is maybe the right band-aid, given I've never seen
issues related to this before.
-Nathan
>From cc3c6e1506e212e1163ec2d6c3bd4ffb7873bce8 Mon Sep 17 00:00:00 2001
From: Nathan Kidd <nk...@opentext.com>
Date: Mon, 1 Dec 2014 11:54:07 -0500
Subject: [PATCH 2/8] Only advertise GLX_ARB_create_context* extensions if
available
Avoids Mesa libGL failing with:
[VGL] ERROR: glXCreateContextAttribsARB symbol not loaded
Repo:
Run QT5 hellogl example on Mesa 10.x e.g. Ubuntu 14.04
---
server/faker-glx.cpp | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/server/faker-glx.cpp b/server/faker-glx.cpp
index 028368b..328174b 100644
--- a/server/faker-glx.cpp
+++ b/server/faker-glx.cpp
@@ -1013,15 +1013,24 @@ void glXFreeContextEXT(Display *dpy, GLXContext ctx)
// Since VirtualGL is effectively its own implementation of GLX, it needs to
// properly report the extensions and GLX version it supports.
-static const char *glxextensions=
- "GLX_ARB_get_proc_address GLX_ARB_multisample GLX_EXT_visual_info GLX_EXT_visual_rating GLX_SGI_make_current_read GLX_SGIX_fbconfig GLX_SGIX_pbuffer GLX_SUN_get_transparent_index GLX_ARB_create_context GLX_ARB_create_context_profile GLX_EXT_texture_from_pixmap GLX_EXT_swap_control GLX_SGI_swap_control";
+#define VGL_GLX_EXTENSIONS \
+ "GLX_ARB_get_proc_address GLX_ARB_multisample GLX_EXT_visual_info GLX_EXT_visual_rating GLX_SGI_make_current_read GLX_SGIX_fbconfig GLX_SGIX_pbuffer GLX_SUN_get_transparent_index GLX_EXT_texture_from_pixmap GLX_EXT_swap_control GLX_SGI_swap_control"
+#define VGL_GLX_ARB_CTX_EXTENSIONS \
+ " GLX_ARB_create_context GLX_ARB_create_context_profile"
+static const char *glxextensions=VGL_GLX_EXTENSIONS VGL_GLX_ARB_CTX_EXTENSIONS;
+static const char *glxextensions_no_arb_ctx=VGL_GLX_EXTENSIONS;
+const char *__vgl_glx_extensions(void)
+{
+ return __glXCreateContextAttribsARB ?
+ glxextensions : glxextensions_no_arb_ctx;
+}
const char *glXGetClientString(Display *dpy, int name)
{
// If this is called internally to OpenGL, use the real function
if(is3D(dpy)) return _glXGetClientString(dpy, name);
////////////////////
- if(name==GLX_EXTENSIONS) return glxextensions;
+ if(name==GLX_EXTENSIONS) return __vgl_glx_extensions();
else if(name==GLX_VERSION) return "1.4";
else if(name==GLX_VENDOR) return __APPNAME;
else return NULL;
@@ -1959,7 +1968,7 @@ const char *glXQueryExtensionsString(Display *dpy, int screen)
// If this is called internally to OpenGL, use the real function.
if(is3D(dpy)) return _glXQueryExtensionsString(dpy, screen);
////////////////////
- return glxextensions;
+ return __vgl_glx_extensions();
}
@@ -1970,7 +1979,7 @@ const char *glXQueryServerString(Display *dpy, int screen, int name)
// If this is called internally to OpenGL, use the real function.
if(is3D(dpy)) return _glXQueryServerString(dpy, screen, name);
////////////////////
- if(name==GLX_EXTENSIONS) return glxextensions;
+ if(name==GLX_EXTENSIONS) return __vgl_glx_extensions();
else if(name==GLX_VERSION) return "1.4";
else if(name==GLX_VENDOR) return __APPNAME;
else return NULL;
--
1.9.1
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