emulator: opengl: Back-port GLES emulation from the master tree.

The modules here are only built when BUILD_EMULATOR_OPENGL is defined to true
in your environment or your BoardConfig.mk (see tools/emulator/opengl/Android.mk)

Change-Id: I5f32c35b4452fb5a7b4d5f9fc5870ec1da6032e6

tools/emulator/opengl/host/libs/libOpenglRender/NativeLinuxSubWindow.cpp

@@ -0,0 +1,48 @@
+/*
+* Copyright (C) 2011 The Android Open Source Project
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+#include "NativeSubWindow.h"
+
+static Bool WaitForMapNotify(Display *d, XEvent *e, char *arg)
+{
+    if (e->type == MapNotify && e->xmap.window == (Window)arg) {
+	    return 1;
+    }
+    return 0;
+}
+
+static Display *s_display = NULL;
+
+EGLNativeWindowType createSubWindow(FBNativeWindowType p_window,
+                                    EGLNativeDisplayType* display_out,
+                                    int x, int y,int width, int height){
+
+   // The call to this function is protected by a lock
+   // in FrameBuffer so it is safe to check and initialize s_display here
+   if (!s_display) s_display = XOpenDisplay(NULL);
+   *display_out = s_display;
+
+    XSetWindowAttributes wa;
+    wa.event_mask = StructureNotifyMask;
+    Window win = XCreateWindow(*display_out,p_window,x,y, width,height,0,CopyFromParent,CopyFromParent,CopyFromParent,CWEventMask,&wa);
+    XMapWindow(*display_out,win);
+    XEvent e;
+    XIfEvent(*display_out, &e, WaitForMapNotify, (char *)win);
+    return win;
+}
+
+void destroySubWindow(EGLNativeDisplayType dis,EGLNativeWindowType win){
+    XDestroyWindow(dis, win);
+}