i915: use helpers for is_resource_referenced

src/gallium/drivers/i915/i915_context.c

 }
 
 
-/*
- * Is referenced functions
- */
-
-
-static unsigned int
-i915_is_resource_referenced(struct pipe_context *pipe,
-                           struct pipe_resource *texture,
-                           unsigned face, unsigned level)
-{
-   /**
-    * FIXME: Return the corrent result. We can't alays return referenced
-    *        since it causes a double flush within the vbo module.
-    */
-#if 0
-   return PIPE_REFERENCED_FOR_READ | PIPE_REFERENCED_FOR_WRITE;
-#else
-   return 0;
-#endif
-}
-
 
 
 /*
    i915->base.draw_elements = i915_draw_elements;
    i915->base.draw_range_elements = i915_draw_range_elements;
 
-   i915->base.is_resource_referenced = i915_is_resource_referenced;
-
    /*
     * Create drawing context and plug our rendering stage into it.
     */

src/gallium/drivers/i915/i915_resource.c

 void
 i915_init_resource_functions(struct i915_context *i915 )
 {
+   i915->base.is_resource_referenced = u_default_is_resource_referenced;
    i915->base.get_transfer = u_get_transfer_vtbl;
    i915->base.transfer_map = u_transfer_map_vtbl;
    i915->base.transfer_flush_region = u_transfer_flush_region_vtbl;

src/gallium/drivers/i915/i915_resource_buffer.c

 {
    i915_buffer_get_handle,	     /* get_handle */
    i915_buffer_destroy,		     /* resource_destroy */
+   NULL,			     /* is_resource_referenced */
    u_default_get_transfer,	     /* get_transfer */
    u_default_transfer_destroy,	     /* transfer_destroy */
    i915_buffer_transfer_map,	     /* transfer_map */

src/gallium/drivers/i915/i915_resource_texture.c

 {
    i915_texture_get_handle,	      /* get_handle */
    i915_texture_destroy,	      /* resource_destroy */
+   NULL,			      /* is_resource_referenced */
    u_default_get_transfer,	      /* get_transfer */
    u_default_transfer_destroy,	      /* transfer_destroy */
    i915_texture_transfer_map,	      /* transfer_map */