st/egl: Add native_display_buffer interface.

The interface is a wrapper to pipe_screen::resource_from_handle and
pipe_screen::resource_get_handle.  A winsys handle is
platform-dependent.

src/gallium/state_trackers/egl/common/native.h

@@ -38,6 +38,7 @@
 extern "C" {
 #endif
 
+#include "native_buffer.h"
 #include "native_modeset.h"
 
 /**
@@ -190,6 +191,7 @@ struct native_display {
                                                    EGLNativePixmapType pix,
                                                    const struct native_config *nconf);
 
+   const struct native_display_buffer *buffer;
    const struct native_display_modeset *modeset;
 };
 

src/gallium/state_trackers/egl/common/native_buffer.h

@@ -0,0 +1,59 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.9
+ *
+ * Copyright (C) 2010 LunarG Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Chia-I Wu <olv@lunarg.com>
+ */
+
+#ifndef _NATIVE_BUFFER_H_
+#define _NATIVE_BUFFER_H_
+
+#include "pipe/p_compiler.h"
+
+struct native_display;
+struct pipe_resource;
+
+/**
+ * Buffer interface of the native display.  It allows native buffers to be
+ * imported and exported.
+ *
+ * Just like a native window or a native pixmap, a native buffer is another
+ * native type.  Its definition depends on the native display.
+ *
+ * For DRM platform, the type of a native buffer is struct winsys_handle.
+ */
+struct native_display_buffer {
+   struct pipe_resource *(*import_buffer)(struct native_display *ndpy,
+                                          const struct pipe_resource *templ,
+                                          void *buf);
+
+   /**
+    * The resource must be creatred with PIPE_BIND_SHARED.
+    */
+   boolean (*export_buffer)(struct native_display *ndpy,
+                            struct pipe_resource *res,
+                            void *buf);
+};
+
+#endif /* _NATIVE_BUFFER_H_ */