Allow multiple wayland compositor state data per process

When eglBindWaylandDisplayWL is called store the wl_global
created in a list associated with the wayland display.
This allows multiple wayland compositor instances to be
created and used per process. This scenario is common for
applications integrating externl process UI elements
via embedded composition e.g. westeros

Signed-off-by: Jeff Wannamaker <jeff_wannamaker@cable.comcast.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

interface/khronos/common/khrn_client.c

@@ -147,7 +147,7 @@ bool client_process_state_init(CLIENT_PROCESS_STATE_T *process)
 {
    if (!process->inited) {
 #ifdef BUILD_WAYLAND
-      process->wl_global = NULL;
+      process->wlStateMap = NULL;
 #endif
 
       if (!khrn_pointer_map_init(&process->contexts, 64))

interface/khronos/common/khrn_client.h

@@ -170,6 +170,15 @@ static INLINE CLIENT_THREAD_STATE_T *CLIENT_GET_CHECK_THREAD_STATE(void)
    return (CLIENT_THREAD_STATE_T *)platform_tls_get_check(client_tls);
 }
 
+#ifdef BUILD_WAYLAND
+typedef struct WAYLAND_STATE
+{
+   struct WAYLAND_STATE *next;
+   struct wl_display *display;
+   struct wl_global *wl_global;
+} WAYLAND_STATE_T;
+#endif
+
 /*
    per-process state
 
@@ -318,7 +327,7 @@ struct CLIENT_PROCESS_STATE {
    struct wl_event_queue *wl_queue;
 
    /* Compositor-side Wayland state */
-   struct wl_global *wl_global;
+   WAYLAND_STATE_T *wlStateMap;
 #endif
 };
 

interface/khronos/ext/egl_wayland.c

@@ -208,17 +208,38 @@ eglBindWaylandDisplayWL(EGLDisplay dpy, struct wl_display *display)
 {
    CLIENT_THREAD_STATE_T *thread;
    CLIENT_PROCESS_STATE_T *process;
+   WAYLAND_STATE_T *stateIter;
+   WAYLAND_STATE_T *stateNew;
+   struct wl_global *wl_global;
 
    if (!CLIENT_LOCK_AND_GET_STATES(dpy, &thread, &process))
       return EGL_FALSE;
 
-   if (process->wl_global != NULL)
+   stateIter= process->wlStateMap;
+   while( stateIter )
+   {
+      if ( stateIter->display == display )
+         goto error;
+      stateIter= stateIter->next;
+   }
+
+   wl_global = wl_global_create(display, &wl_dispmanx_interface, 1,
+                                NULL, bind_dispmanx);
+   if (wl_global == NULL)
       goto error;
 
-   process->wl_global = wl_global_create(display, &wl_dispmanx_interface, 1,
-                                         NULL, bind_dispmanx);
-   if (process->wl_global == NULL)
+   stateNew= (WAYLAND_STATE_T*)calloc( 1, sizeof(WAYLAND_STATE_T));
+   if (stateNew == NULL )
+   {
+      wl_global_destroy(wl_global);
       goto error;
+   }
+
+   stateNew->next= process->wlStateMap;
+   stateNew->display= display;
+   stateNew->wl_global= wl_global;
+   process->wlStateMap= stateNew;
+   CLIENT_UNLOCK();
 
    return EGL_TRUE;
 
@@ -232,12 +253,29 @@ eglUnbindWaylandDisplayWL(EGLDisplay dpy, struct wl_display *display)
 {
    CLIENT_THREAD_STATE_T *thread;
    CLIENT_PROCESS_STATE_T *process;
+   WAYLAND_STATE_T *stateIter;
+   WAYLAND_STATE_T *statePrev;
 
    if (!CLIENT_LOCK_AND_GET_STATES(dpy, &thread, &process))
       return EGL_FALSE;
 
-   wl_global_destroy(process->wl_global);
-   process->wl_global = NULL;
+   statePrev= NULL;
+   stateIter= process->wlStateMap;
+   while( stateIter )
+   {
+      if ( stateIter->display == display )
+      {
+         wl_global_destroy(stateIter->wl_global);
+         if ( statePrev )
+            statePrev->next= stateIter->next;
+         else
+            process->wlStateMap= stateIter->next;
+         free( stateIter );
+         break;
+      }
+      statePrev= stateIter;
+      stateIter= stateIter->next;
+   }
 
    CLIENT_UNLOCK();