//
// Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// Surface.h: Defines the egl::Surface class, representing a drawing surface
// such as the client area of a window, including any back buffers.
// Implements EGLSurface and related functionality. [EGL 1.4] section 2.2 page 3.

#ifndef LIBEGL_SURFACE_H_
#define LIBEGL_SURFACE_H_

#define EGLAPI
#include <EGL/egl.h>

#include "common/angleutils.h"
#include "common/system.h"

namespace gl
{
class Texture2D;
}
namespace rx
{
class Renderer;
class SwapChain;
}

namespace egl
{
class Display;
class Config;
class Surface;

class WindowSubclass
{
  public:
      virtual ~WindowSubclass() {}
      virtual bool getWindowSize(EGLint *width, EGLint *height) = 0;
};

class Surface
{
  public:
    Surface(Display *display, const egl::Config *config, EGLNativeWindowType window, EGLint postSubBufferSupported);
    Surface(Display *display, const egl::Config *config, HANDLE shareHandle, EGLint width, EGLint height, EGLenum textureFormat, EGLenum textureTarget);

    ~Surface();

    bool initialize();
    void release();
    bool resetSwapChain();

    bool hasWindow() const;
    bool compareWindow(EGLNativeWindowType window) const;

    bool swap();
    bool postSubBuffer(EGLint x, EGLint y, EGLint width, EGLint height);

    virtual EGLint getWidth() const;
    virtual EGLint getHeight() const;

    virtual EGLint isPostSubBufferSupported() const;

    virtual rx::SwapChain *getSwapChain() const;

    void setSwapInterval(EGLint interval);
    bool checkForOutOfDateSwapChain();   // Returns true if swapchain changed due to resize or interval update

    virtual EGLenum getTextureFormat() const;
    virtual EGLenum getTextureTarget() const;
    virtual EGLenum getFormat() const;

    virtual void setBoundTexture(gl::Texture2D *texture);
    virtual gl::Texture2D *getBoundTexture() const;

private:
    DISALLOW_COPY_AND_ASSIGN(Surface);

    bool resizeSwapChain(EGLint backbufferWidth, EGLint backbufferHeight);
    bool resetSwapChain(EGLint backbufferWidth, EGLint backbufferHeight);
    bool swapRect(EGLint x, EGLint y, EGLint width, EGLint height);

    static WindowSubclass *createWindowSubclass(Surface *surface, EGLNativeWindowType window);
    WindowSubclass *mWindowSubclass;

    Display *const mDisplay;
    rx::Renderer *mRenderer;

    HANDLE mShareHandle;
    rx::SwapChain *mSwapChain;

    const EGLNativeWindowType mWindow;   // Window that the surface is created for.
    const egl::Config *mConfig;          // EGL config surface was created with
    EGLint mHeight;                      // Height of surface
    EGLint mWidth;                       // Width of surface
//  EGLint horizontalResolution;         // Horizontal dot pitch
//  EGLint verticalResolution;           // Vertical dot pitch
//  EGLBoolean largestPBuffer;           // If true, create largest pbuffer possible
//  EGLBoolean mipmapTexture;            // True if texture has mipmaps
//  EGLint mipmapLevel;                  // Mipmap level to render to
//  EGLenum multisampleResolve;          // Multisample resolve behavior
    EGLint mPixelAspectRatio;            // Display aspect ratio
    EGLenum mRenderBuffer;               // Render buffer
    EGLenum mSwapBehavior;               // Buffer swap behavior
    EGLenum mTextureFormat;              // Format of texture: RGB, RGBA, or no texture
    EGLenum mTextureTarget;              // Type of texture: 2D or no texture
//  EGLenum vgAlphaFormat;               // Alpha format for OpenVG
//  EGLenum vgColorSpace;                // Color space for OpenVG
    EGLint mSwapInterval;
    EGLint mPostSubBufferSupported;
    
    bool mSwapIntervalDirty;
    gl::Texture2D *mTexture;
};
}

#endif   // LIBEGL_SURFACE_H_