egl: Improve driver selection.

The idea is to be able to match a driver using the following order

  try egl_gallium with hw renderer
  try egl_dri2
  try egl_gallium with sw renderer
  try egl_glx

given the module list

  egl_gallium
  egl_dri2
  egl_glx

For that, UseFallback initialization option is added.  The module list
is matched twice: with the option unset and with the option set.  In the
first pass, egl_gallium skips its sw renderer and egl_glx rejects to
initialize since UseFallback is not set.  In the second pass,
egl_gallium skips its hw renderer and egl_dri2 rejects to initialize
since UseFallback is set.  The process stops at the first driver that
initializes the display.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/gallium/state_trackers/egl/common/native.h b/src/gallium/state_trackers/egl/common/native.h
index 654f445fca..6461b5edbd 100644
--- a/src/gallium/state_trackers/egl/common/native.h
+++ b/src/gallium/state_trackers/egl/common/native.h
@@ -226,8 +226,9 @@ native_attachment_mask_test(uint mask, enum native_attachment att)
 struct native_platform {
    const char *name;
 
+   void (*set_event_handler)(struct native_event_handler *handler);
    struct native_display *(*create_display)(void *dpy,
-                                            struct native_event_handler *handler,
+                                            boolean use_sw,
                                             void *user_data);
 };