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/WindowSurface.h

@@ -0,0 +1,72 @@
+/*
+* 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.
+*/
+#ifndef _LIBRENDER_WINDOWSURFACE_H
+#define _LIBRENDER_WINDOWSURFACE_H
+
+#include "ColorBuffer.h"
+#include "RenderContext.h"
+#include "FBConfig.h"
+#include "SmartPtr.h"
+#include "FixedBuffer.h"
+#include <EGL/egl.h>
+#include <GLES/gl.h>
+
+enum SurfaceBindType {
+    SURFACE_BIND_READ,
+    SURFACE_BIND_DRAW,
+    SURFACE_BIND_READDRAW
+};
+
+class WindowSurface
+{
+public:
+    static WindowSurface *create(int p_config, int p_width, int p_height);
+    ~WindowSurface();
+    EGLSurface getEGLSurface() const { return m_eglSurface; }
+
+    void setColorBuffer(ColorBufferPtr p_colorBuffer);
+    void flushColorBuffer();
+    void bind(RenderContextPtr p_ctx, SurfaceBindType p_bindType);
+
+private:
+    WindowSurface();
+
+    void copyToColorBuffer();  // copy pbuffer content with readback+download
+    void blitToColorBuffer();  // copy pbuffer content with texload and blit
+    bool resizePbuffer(unsigned int p_width, unsigned int p_height);
+
+private:
+    GLuint m_fbObj;   // GLES Framebuffer object (when EGLimage is used)
+    GLuint m_depthRB;
+    GLuint m_stencilRB;
+    EGLSurface m_eglSurface;
+    ColorBufferPtr m_attachedColorBuffer;
+    RenderContextPtr m_readContext;
+    RenderContextPtr m_drawContext;
+    GLuint m_width;
+    GLuint m_height;
+    GLuint m_pbufWidth;
+    GLuint m_pbufHeight;
+    bool m_useEGLImage;
+    bool m_useBindToTexture;
+    FixedBuffer m_xferBuffer;
+    FixedBuffer m_xUpdateBuf;
+    const FBConfig *m_fbconf;
+};
+
+typedef SmartPtr<WindowSurface> WindowSurfacePtr;
+
+#endif