//
// Copyright (c) 2002-2014 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.cpp: Implements 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.

#include "libANGLE/Surface.h"

#include "libANGLE/Config.h"
#include "libANGLE/Framebuffer.h"
#include "libANGLE/Texture.h"

#include <EGL/eglext.h>

#include <iostream>

namespace egl
{

Surface::Surface(rx::SurfaceImpl *impl,
                 EGLint surfaceType,
                 const egl::Config *config,
                 const AttributeMap &attributes)
    : FramebufferAttachmentObject(),
      mImplementation(impl),
      mDefaultFramebuffer(nullptr),
      mCurrentCount(0),
      mDestroyed(false),
      mType(surfaceType),
      mConfig(config),
      mPostSubBufferRequested(false),
      mFixedSize(false),
      mFixedWidth(0),
      mFixedHeight(0),
      mTextureFormat(EGL_NO_TEXTURE),
      mTextureTarget(EGL_NO_TEXTURE),
      // FIXME: Determine actual pixel aspect ratio
      mPixelAspectRatio(static_cast<EGLint>(1.0 * EGL_DISPLAY_SCALING)),
      mRenderBuffer(EGL_BACK_BUFFER),
      mSwapBehavior(impl->getSwapBehavior())
{
    mPostSubBufferRequested = (attributes.get(EGL_POST_SUB_BUFFER_SUPPORTED_NV, EGL_FALSE) == EGL_TRUE);

    mFixedSize = (attributes.get(EGL_FIXED_SIZE_ANGLE, EGL_FALSE) == EGL_TRUE);
    if (mFixedSize)
    {
        mFixedWidth = attributes.get(EGL_WIDTH, 0);
        mFixedHeight = attributes.get(EGL_HEIGHT, 0);
    }

    if (mType != EGL_WINDOW_BIT)
    {
        mTextureFormat = attributes.get(EGL_TEXTURE_FORMAT, EGL_NO_TEXTURE);
        mTextureTarget = attributes.get(EGL_TEXTURE_TARGET, EGL_NO_TEXTURE);
    }

    mDefaultFramebuffer = createDefaultFramebuffer();
    ASSERT(mDefaultFramebuffer != nullptr);
}

Surface::~Surface()
{
    if (mTexture.get())
    {
        if (mImplementation)
        {
            mImplementation->releaseTexImage(EGL_BACK_BUFFER);
        }
        mTexture->releaseTexImageFromSurface();
        mTexture.set(nullptr);
    }

    SafeDelete(mDefaultFramebuffer);
    SafeDelete(mImplementation);
}

void Surface::setIsCurrent(bool isCurrent)
{
    if (isCurrent)
    {
        mCurrentCount++;
    }
    else
    {
        ASSERT(mCurrentCount > 0);
        mCurrentCount--;
        if (mCurrentCount == 0 && mDestroyed)
        {
            delete this;
        }
    }
}

void Surface::onDestroy()
{
    mDestroyed = true;
    if (mCurrentCount == 0)
    {
        delete this;
    }
}

EGLint Surface::getType() const
{
    return mType;
}

Error Surface::swap()
{
    return mImplementation->swap();
}

Error Surface::postSubBuffer(EGLint x, EGLint y, EGLint width, EGLint height)
{
    return mImplementation->postSubBuffer(x, y, width, height);
}

Error Surface::querySurfacePointerANGLE(EGLint attribute, void **value)
{
    return mImplementation->querySurfacePointerANGLE(attribute, value);
}

EGLint Surface::isPostSubBufferSupported() const
{
    return mPostSubBufferRequested && mImplementation->isPostSubBufferSupported();
}

void Surface::setSwapInterval(EGLint interval)
{
    mImplementation->setSwapInterval(interval);
}

const Config *Surface::getConfig() const
{
    return mConfig;
}

EGLint Surface::getPixelAspectRatio() const
{
    return mPixelAspectRatio;
}

EGLenum Surface::getRenderBuffer() const
{
    return mRenderBuffer;
}

EGLenum Surface::getSwapBehavior() const
{
    return mSwapBehavior;
}

EGLenum Surface::getTextureFormat() const
{
    return mTextureFormat;
}

EGLenum Surface::getTextureTarget() const
{
    return mTextureTarget;
}

EGLint Surface::isFixedSize() const
{
    return mFixedSize;
}

EGLint Surface::getWidth() const
{
    return mFixedSize ? static_cast<EGLint>(mFixedWidth) : mImplementation->getWidth();
}

EGLint Surface::getHeight() const
{
    return mFixedSize ? static_cast<EGLint>(mFixedHeight) : mImplementation->getHeight();
}

Error Surface::bindTexImage(gl::Texture *texture, EGLint buffer)
{
    ASSERT(!mTexture.get());

    texture->bindTexImageFromSurface(this);
    mTexture.set(texture);
    return mImplementation->bindTexImage(texture, buffer);
}

Error Surface::releaseTexImage(EGLint buffer)
{
    ASSERT(mTexture.get());
    mTexture->releaseTexImageFromSurface();
    mTexture.set(nullptr);

    return mImplementation->releaseTexImage(buffer);
}

void Surface::releaseTexImageFromTexture()
{
    ASSERT(mTexture.get());
    mTexture.set(nullptr);
}

gl::Extents Surface::getAttachmentSize(const gl::FramebufferAttachment::Target & /*target*/) const
{
    return gl::Extents(getWidth(), getHeight(), 1);
}

GLenum Surface::getAttachmentInternalFormat(const gl::FramebufferAttachment::Target &target) const
{
    const egl::Config *config = getConfig();
    return (target.binding() == GL_BACK ? config->renderTargetFormat : config->depthStencilFormat);
}

GLsizei Surface::getAttachmentSamples(const gl::FramebufferAttachment::Target &target) const
{
    return getConfig()->samples;
}

GLuint Surface::getId() const
{
    UNREACHABLE();
    return 0;
}

gl::Framebuffer *Surface::createDefaultFramebuffer()
{
    gl::Framebuffer *framebuffer = new gl::Framebuffer(mImplementation);

    GLenum drawBufferState = GL_BACK;
    framebuffer->setDrawBuffers(1, &drawBufferState);
    framebuffer->setReadBuffer(GL_BACK);

    framebuffer->setAttachment(GL_FRAMEBUFFER_DEFAULT, GL_BACK, gl::ImageIndex::MakeInvalid(),
                               this);

    if (mConfig->depthSize > 0)
    {
        framebuffer->setAttachment(GL_FRAMEBUFFER_DEFAULT, GL_DEPTH, gl::ImageIndex::MakeInvalid(),
                                   this);
    }

    if (mConfig->stencilSize > 0)
    {
        framebuffer->setAttachment(GL_FRAMEBUFFER_DEFAULT, GL_STENCIL,
                                   gl::ImageIndex::MakeInvalid(), this);
    }

    return framebuffer;
}
}
