/*
 *  Copyright 2019-2021 Diligent Graphics LLC
 *  Copyright 2015-2019 Egor Yusov
 *  
 *  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.
 *
 *  In no event and under no legal theory, whether in tort (including negligence), 
 *  contract, or otherwise, unless required by applicable law (such as deliberate 
 *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
 *  liable for any damages, including any direct, indirect, special, incidental, 
 *  or consequential damages of any character arising as a result of this License or 
 *  out of the use or inability to use the software (including but not limited to damages 
 *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
 *  all other commercial damages or losses), even if such Contributor has been advised 
 *  of the possibility of such damages.
 */

#include "pch.h"

#include "SwapChainGLImpl.hpp"
#include "RenderDeviceGLImpl.hpp"
#include "DeviceContextGLImpl.hpp"
#include "GraphicsAccessories.hpp"

namespace Diligent
{

SwapChainGLImpl::SwapChainGLImpl(IReferenceCounters*       pRefCounters,
                                 const EngineGLCreateInfo& InitAttribs,
                                 const SwapChainDesc&      SCDesc,
                                 RenderDeviceGLImpl*       pRenderDeviceGL,
                                 DeviceContextGLImpl*      pImmediateContextGL) :
    // clang-format off
    TSwapChainGLBase
    {
        pRefCounters,
        pRenderDeviceGL,
        pImmediateContextGL,
        SCDesc
    }
// clang-format on
{
    if (m_DesiredPreTransform != SURFACE_TRANSFORM_OPTIMAL &&
        m_DesiredPreTransform != SURFACE_TRANSFORM_IDENTITY)
    {
        LOG_WARNING_MESSAGE(GetSurfaceTransformString(m_DesiredPreTransform),
                            " is not an allowed pretransform because OpenGL swap chains only support identity transform. "
                            "Use SURFACE_TRANSFORM_OPTIMAL (recommended) or SURFACE_TRANSFORM_IDENTITY.");
    }
    m_DesiredPreTransform        = SURFACE_TRANSFORM_OPTIMAL;
    m_SwapChainDesc.PreTransform = SURFACE_TRANSFORM_IDENTITY;

#if PLATFORM_WIN32
    HWND hWnd = reinterpret_cast<HWND>(InitAttribs.Window.hWnd);
    RECT rc;
    GetClientRect(hWnd, &rc);
    m_SwapChainDesc.Width  = rc.right - rc.left;
    m_SwapChainDesc.Height = rc.bottom - rc.top;
#elif PLATFORM_LINUX
    auto wnd     = InitAttribs.Window.WindowId;
    auto display = reinterpret_cast<Display*>(InitAttribs.Window.pDisplay);

    XWindowAttributes XWndAttribs;
    XGetWindowAttributes(display, wnd, &XWndAttribs);

    m_SwapChainDesc.Width  = XWndAttribs.width;
    m_SwapChainDesc.Height = XWndAttribs.height;
#elif PLATFORM_ANDROID
    auto& GLContext        = pRenderDeviceGL->m_GLContext;
    m_SwapChainDesc.Width  = GLContext.GetScreenWidth();
    m_SwapChainDesc.Height = GLContext.GetScreenHeight();
#elif PLATFORM_MACOS
    //Set dummy width and height until resize is called by the app
    m_SwapChainDesc.Width  = 1024;
    m_SwapChainDesc.Height = 768;
#else
#    error Unsupported platform
#endif

    CreateDummyBuffers(pRenderDeviceGL);
}

SwapChainGLImpl::~SwapChainGLImpl()
{
}

IMPLEMENT_QUERY_INTERFACE(SwapChainGLImpl, IID_SwapChainGL, TSwapChainGLBase)

void SwapChainGLImpl::Present(Uint32 SyncInterval)
{
#if PLATFORM_WIN32 || PLATFORM_LINUX || PLATFORM_ANDROID
    auto* pDeviceGL = m_pRenderDevice.RawPtr<RenderDeviceGLImpl>();
    auto& GLContext = pDeviceGL->m_GLContext;
    GLContext.SwapBuffers(static_cast<int>(SyncInterval));
#elif PLATFORM_MACOS
    LOG_ERROR("Swap buffers operation must be performed by the app on MacOS");
#else
#    error Unsupported platform
#endif

    // Unbind back buffer from device context to be consistent with other backends
    if (auto pDeviceContext = m_wpDeviceContext.Lock())
    {
        auto* pDeviceCtxGl = pDeviceContext.RawPtr<DeviceContextGLImpl>();
        auto* pBackBuffer  = ValidatedCast<TextureBaseGL>(m_pRenderTargetView->GetTexture());
        pDeviceCtxGl->UnbindTextureFromFramebuffer(pBackBuffer, false);
    }
}

void SwapChainGLImpl::Resize(Uint32 NewWidth, Uint32 NewHeight, SURFACE_TRANSFORM NewPreTransform)
{
#if PLATFORM_ANDROID
    auto* pDeviceGL = m_pRenderDevice.RawPtr<RenderDeviceGLImpl>();
    auto& GLContext = pDeviceGL->m_GLContext;
    GLContext.UpdateScreenSize();
    const auto ScreenWidth  = GLContext.GetScreenWidth();
    const auto ScreenHeight = GLContext.GetScreenHeight();

    if (NewWidth == 0)
    {
        NewWidth = ScreenWidth;
    }
    else
    {
        if (NewWidth != ScreenWidth)
        {
            LOG_WARNING_MESSAGE("Requested new swap chain width (", NewWidth, ") does not match GLES surface width (", ScreenWidth,
                                "). This may be the result of calling Resize before the rotation has taken the effect.");
        }
    }

    if (NewHeight == 0)
    {
        NewHeight = ScreenHeight;
    }
    else
    {
        if (NewHeight != ScreenHeight)
        {
            LOG_WARNING_MESSAGE("Requested new swap chain height (", NewHeight, ") does not match GLES surface height (", ScreenHeight,
                                "). This may be the result of calling Resize before the rotation has taken the effect.");
        }
    }
#endif

    TSwapChainGLBase::Resize(NewWidth, NewHeight, NewPreTransform, 0);
}

void SwapChainGLImpl::SetFullscreenMode(const DisplayModeAttribs& DisplayMode)
{
    UNSUPPORTED("OpenGL does not support switching to the fullscreen mode");
}

void SwapChainGLImpl::SetWindowedMode()
{
    UNSUPPORTED("OpenGL does not support switching to the windowed mode");
}

} // namespace Diligent