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, 11 insertions, 3 deletions

diff --git a/src/gallium/state_trackers/egl/fbdev/native_fbdev.c b/src/gallium/state_trackers/egl/fbdev/native_fbdev.c
index 1b5ea8bf9d5..a1e91ba701c 100644
--- a/src/gallium/state_trackers/egl/fbdev/native_fbdev.c
+++ b/src/gallium/state_trackers/egl/fbdev/native_fbdev.c
@@ -459,9 +459,16 @@ fbdev_display_create(int fd, struct native_event_handler *event_handler,
    return &fbdpy->base;
 }
 
+static struct native_event_handler *fbdev_event_handler;
+
+static void
+native_set_event_handler(struct native_event_handler *event_handler)
+{
+   fbdev_event_handler = event_handler;
+}
+
 static struct native_display *
-native_create_display(void *dpy, struct native_event_handler *event_handler,
-                      void *user_data)
+native_create_display(void *dpy, boolean use_sw, void *user_data)
 {
    struct native_display *ndpy;
    int fd;
@@ -476,7 +483,7 @@ native_create_display(void *dpy, struct native_event_handler *event_handler,
    if (fd < 0)
       return NULL;
 
-   ndpy = fbdev_display_create(fd, event_handler, user_data);
+   ndpy = fbdev_display_create(fd, fbdev_event_handler, user_data);
    if (!ndpy)
       close(fd);
 
@@ -485,6 +492,7 @@ native_create_display(void *dpy, struct native_event_handler *event_handler,
 
 static const struct native_platform fbdev_platform = {
    "FBDEV", /* name */
+   native_set_event_handler,
    native_create_display
 };