Add hw.gpu.enabled hardware property

This patch adds a new hardware property to enable GPU emulation
(named hw.gpu.enabled). It is currently disabled by default.

It also modifies the UI code to display the GL output properly
inside the UI window. And sets the kernel parameter qemu.gles
to either 0 or 1 to indicate to the guest system's GLES libraries
whether to use GPU emulation or fallback to the software renderer.

A future patch will also add auto-detection of desktop GL capabilities.
For example, if the emulator is started on a headless server without
an X11/GL display, hw.gpu.enabled will be forced to 'no', forcing the
guest to use the software renderer.

Another patch will allow to change the property from the command-line
for debugging purpose.

NOTE: If you want to test GPU emulation, change the default value of
      the property in android/avd/hardware-properties.ini from 'no'
      to 'yes'. You will need to run a ToT master AOSP tree with
      the following pending patches applied:

      https://review.source.android.com/25797
      https://review.source.android.com/25154
      https://review.source.android.com/25759

Change-Id: I1fa3512be24395244fd5068f2bf59ad54db5c7d5

1 files changed, 37 insertions, 0 deletions

diff --git a/android/opengles.h b/android/opengles.h
new file mode 100644
index 0000000..b31ce11
--- /dev/null
+++ b/android/opengles.h
@@ -0,0 +1,37 @@
+/* Copyright (C) 2011 The Android Open Source Project
+**
+** This software is licensed under the terms of the GNU General Public
+** License version 2, as published by the Free Software Foundation, and
+** may be copied, distributed, and modified under those terms.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+** GNU General Public License for more details.
+*/
+#ifndef ANDROID_OPENGLES_H
+#define ANDROID_OPENGLES_H
+
+#define ANDROID_OPENGLES_BASE_PORT  22468
+
+/* Call this function to initialize the hardware opengles emulation.
+ * This function will abort if we can't find the corresponding host
+ * libraries through dlopen() or equivalent.
+ */
+int android_initOpenglesEmulation(void);
+
+/* Tries to start the renderer process. Returns 0 on success, -1 on error.
+ * At the moment, this must be done before the VM starts.
+ */
+int android_startOpenglesRenderer(int width, int height);
+
+int android_showOpenglesWindow(void* window, int x, int y, int width, int height, float rotation);
+
+int android_hideOpenglesWindow(void);
+
+void android_redrawOpenglesWindow(void);
+
+/* Stop the renderer process */
+void android_stopOpenglesRenderer(void);
+
+#endif /* ANDROID_OPENGLES_H */