opengles emulator: support display rotation and resize

Changes the render_api to support re-creating the display
sub-window and the ability to rotate the displayed framebuffer
image.
That currently works only when the renderer runs as a thread
and not as seperate process. Therefore we setup the library
to run the renderer as thread(s) inside the calling process
on *all* platforms for now.

Change-Id: Ifd009db903759042a7edcf89866d3c3fe076cae9

tools/emulator/opengl/host/libs/libOpenglRender/FrameBuffer.h

@@ -43,9 +43,11 @@ struct FrameBufferCaps
 class FrameBuffer
 {
 public:
-    static bool initialize(FBNativeWindowType p_window,
-                           int x, int y,
-                           int width, int height);
+    static bool initialize(int width, int height);
+    static bool setupSubWindow(FBNativeWindowType p_window,
+                                int x, int y,
+                                int width, int height, float zRot);
+    static bool removeSubWindow();
     static void finalize();
     static FrameBuffer *getFB() { return s_theFrameBuffer; }
 
@@ -70,7 +72,8 @@ public:
                            int x, int y, int width, int height,
                            GLenum format, GLenum type, void *pixels);
 
-    bool post(HandleType p_colorbuffer);
+    bool post(HandleType p_colorbuffer, bool needLock = true);
+    bool repost();
 
     EGLDisplay getDisplay() const { return m_eglDisplay; }
     EGLContext getContext() const { return m_eglContext; }
@@ -78,10 +81,16 @@ public:
     bool bind_locked();
     bool unbind_locked();
 
+    void setDisplayRotation(float zRot) {
+        m_zRot = zRot;
+        repost();
+    }
+
 private:
-    FrameBuffer(int p_x, int p_y, int p_width, int p_height);
+    FrameBuffer(int p_width, int p_height);
     ~FrameBuffer();
     HandleType genHandle();
+    bool bindSubwin_locked();
 
 private:
     static FrameBuffer *s_theFrameBuffer;
@@ -100,12 +109,16 @@ private:
 
     EGLSurface m_eglSurface;
     EGLContext m_eglContext;
+    EGLSurface m_pbufSurface;
 
     EGLContext m_prevContext;
     EGLSurface m_prevReadSurf;
     EGLSurface m_prevDrawSurf;
     EGLNativeWindowType m_subWin;
     EGLNativeDisplayType m_subWinDisplay;
+    EGLConfig  m_eglConfig;
+    HandleType m_lastPostedColorBuffer;
+    float      m_zRot;
 
     int m_statsNumFrames;
     long long m_statsStartTime;