xlib: add support for GLX_ARB_create_context

This adds the glXCreateContextAttribsARB() function for the xlib/swrast
driver.  This allows more piglit tests to run with this driver.

For example, without this patch we get:
$ bin/fbo-generatemipmap-1d -auto
piglit: error: waffle_config_choose failed due to WAFFLE_ERROR_UNSUPPORTED_
ON_PLATFORM: GLX_ARB_create_context is required in order to request an OpenGL
version not equal to the default value 1.0
piglit: error: Failed to create waffle_config for OpenGL 2.0 Compatibility Context
piglit: info: Failed to create any GL context
PIGLIT: {"result": "skip" }

Reviewed-by: Jose Fonseca <[email protected]>
Acked-by: Roland Scheidegger <[email protected]>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/mesa/drivers/x11/glxapi.h b/src/mesa/drivers/x11/glxapi.h
index bd6e97053e6..aff38f7531d 100644
--- a/src/mesa/drivers/x11/glxapi.h
+++ b/src/mesa/drivers/x11/glxapi.h
@@ -201,6 +201,11 @@ struct _glxapi_table {
    void (*BindTexImageEXT)(Display *dpy, GLXDrawable drawable, int buffer,
                            const int *attrib_list);
    void (*ReleaseTexImageEXT)(Display *dpy, GLXDrawable drawable, int buffer);
+
+   /*** GLX_ARB_create_context ***/
+   GLXContext (*CreateContextAttribs)(Display *dpy, GLXFBConfig config,
+                                      GLXContext share_context, Bool direct,
+                                      const int *attrib_list);
 };