glx: Implement GLX_EXT_no_config_context

This is the GLX counterpart to EGL_KHR_no_config_context. Contexts may
now be created without reference to an fbconfig, in which case it is
treated as compatible with any fbconfig (and thus any GLX drawable).

Khronos: https://github.com/KhronosGroup/OpenGL-Registry/pull/102
Reviewed-by: Kenneth Graunke <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

1 files changed, 13 insertions, 1 deletions

diff --git a/src/glx/g_glxglvnddispatchfuncs.c b/src/glx/g_glxglvnddispatchfuncs.c
index 0f02ed2d321..78c097febb6 100644
--- a/src/glx/g_glxglvnddispatchfuncs.c
+++ b/src/glx/g_glxglvnddispatchfuncs.c
@@ -160,7 +160,19 @@ static GLXContext dispatch_CreateContextAttribsARB(Display *dpy,
     __GLXvendorInfo *dd;
     GLXContext ret;
 
-    dd = GetDispatchFromFBConfig(dpy, config);
+    if (config) {
+       dd = GetDispatchFromFBConfig(dpy, config);
+    } else if (attrib_list) {
+       int i, screen;
+
+       for (i = 0; attrib_list[i * 2] != None; i++) {
+          if (attrib_list[i * 2] == GLX_SCREEN) {
+             screen = attrib_list[i * 2 + 1];
+             dd = GetDispatchFromDrawable(dpy, RootWindow(dpy, screen));
+             break;
+          }
+       }
+    }
     if (dd == NULL)
         return None;