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Merge pull request #3649 from stenzek/wgl-core-shared 

GLInterface: Implement core and shared context creation for WGL
This commit is contained in:
Stenzek 2016-11-29 22:59:31 +10:00 committed by GitHub
parent eebe4ef1fd 7353cae707
commit aadc77c493
2 changed files with 409 additions and 65 deletions
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464
Source/Core/Common/GL/GLInterface/WGL.cpp
View File

@ -2,6 +2,7 @@
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <array>
#include <string>
#include <windows.h>
@ -9,13 +10,152 @@
#include "Common/Logging/Log.h"
#include "Common/MsgHandler.h"
static HDC hDC = nullptr; // Private GDI Device Context
static HGLRC hRC = nullptr; // Permanent Rendering Context
static HINSTANCE dllHandle = nullptr; // Handle to OpenGL32.dll
// from wglext.h
#ifndef WGL_ARB_pbuffer
#define WGL_ARB_pbuffer 1
DECLARE_HANDLE(HPBUFFERARB);
#define WGL_DRAW_TO_PBUFFER_ARB 0x202D
#define WGL_MAX_PBUFFER_PIXELS_ARB 0x202E
#define WGL_MAX_PBUFFER_WIDTH_ARB 0x202F
#define WGL_MAX_PBUFFER_HEIGHT_ARB 0x2030
#define WGL_PBUFFER_LARGEST_ARB 0x2033
#define WGL_PBUFFER_WIDTH_ARB 0x2034
#define WGL_PBUFFER_HEIGHT_ARB 0x2035
#define WGL_PBUFFER_LOST_ARB 0x2036
typedef HPBUFFERARB(WINAPI* PFNWGLCREATEPBUFFERARBPROC)(HDC hDC, int iPixelFormat, int iWidth,
int iHeight, const int* piAttribList);
typedef HDC(WINAPI* PFNWGLGETPBUFFERDCARBPROC)(HPBUFFERARB hPbuffer);
typedef int(WINAPI* PFNWGLRELEASEPBUFFERDCARBPROC)(HPBUFFERARB hPbuffer, HDC hDC);
typedef BOOL(WINAPI* PFNWGLDESTROYPBUFFERARBPROC)(HPBUFFERARB hPbuffer);
typedef BOOL(WINAPI* PFNWGLQUERYPBUFFERARBPROC)(HPBUFFERARB hPbuffer, int iAttribute, int* piValue);
#endif /* WGL_ARB_pbuffer */
// typedef from wglext.h
#ifndef WGL_ARB_pixel_format
#define WGL_ARB_pixel_format 1
#define WGL_NUMBER_PIXEL_FORMATS_ARB 0x2000
#define WGL_DRAW_TO_WINDOW_ARB 0x2001
#define WGL_DRAW_TO_BITMAP_ARB 0x2002
#define WGL_ACCELERATION_ARB 0x2003
#define WGL_NEED_PALETTE_ARB 0x2004
#define WGL_NEED_SYSTEM_PALETTE_ARB 0x2005
#define WGL_SWAP_LAYER_BUFFERS_ARB 0x2006
#define WGL_SWAP_METHOD_ARB 0x2007
#define WGL_NUMBER_OVERLAYS_ARB 0x2008
#define WGL_NUMBER_UNDERLAYS_ARB 0x2009
#define WGL_TRANSPARENT_ARB 0x200A
#define WGL_TRANSPARENT_RED_VALUE_ARB 0x2037
#define WGL_TRANSPARENT_GREEN_VALUE_ARB 0x2038
#define WGL_TRANSPARENT_BLUE_VALUE_ARB 0x2039
#define WGL_TRANSPARENT_ALPHA_VALUE_ARB 0x203A
#define WGL_TRANSPARENT_INDEX_VALUE_ARB 0x203B
#define WGL_SHARE_DEPTH_ARB 0x200C
#define WGL_SHARE_STENCIL_ARB 0x200D
#define WGL_SHARE_ACCUM_ARB 0x200E
#define WGL_SUPPORT_GDI_ARB 0x200F
#define WGL_SUPPORT_OPENGL_ARB 0x2010
#define WGL_DOUBLE_BUFFER_ARB 0x2011
#define WGL_STEREO_ARB 0x2012
#define WGL_PIXEL_TYPE_ARB 0x2013
#define WGL_COLOR_BITS_ARB 0x2014
#define WGL_RED_BITS_ARB 0x2015
#define WGL_RED_SHIFT_ARB 0x2016
#define WGL_GREEN_BITS_ARB 0x2017
#define WGL_GREEN_SHIFT_ARB 0x2018
#define WGL_BLUE_BITS_ARB 0x2019
#define WGL_BLUE_SHIFT_ARB 0x201A
#define WGL_ALPHA_BITS_ARB 0x201B
#define WGL_ALPHA_SHIFT_ARB 0x201C
#define WGL_ACCUM_BITS_ARB 0x201D
#define WGL_ACCUM_RED_BITS_ARB 0x201E
#define WGL_ACCUM_GREEN_BITS_ARB 0x201F
#define WGL_ACCUM_BLUE_BITS_ARB 0x2020
#define WGL_ACCUM_ALPHA_BITS_ARB 0x2021
#define WGL_DEPTH_BITS_ARB 0x2022
#define WGL_STENCIL_BITS_ARB 0x2023
#define WGL_AUX_BUFFERS_ARB 0x2024
#define WGL_NO_ACCELERATION_ARB 0x2025
#define WGL_GENERIC_ACCELERATION_ARB 0x2026
#define WGL_FULL_ACCELERATION_ARB 0x2027
#define WGL_SWAP_EXCHANGE_ARB 0x2028
#define WGL_SWAP_COPY_ARB 0x2029
#define WGL_SWAP_UNDEFINED_ARB 0x202A
#define WGL_TYPE_RGBA_ARB 0x202B
#define WGL_TYPE_COLORINDEX_ARB 0x202C
typedef BOOL(WINAPI* PFNWGLGETPIXELFORMATATTRIBIVARBPROC)(HDC hdc, int iPixelFormat,
int iLayerPlane, UINT nAttributes,
const int* piAttributes, int* piValues);
typedef BOOL(WINAPI* PFNWGLGETPIXELFORMATATTRIBFVARBPROC)(HDC hdc, int iPixelFormat,
int iLayerPlane, UINT nAttributes,
const int* piAttributes, FLOAT* pfValues);
typedef BOOL(WINAPI* PFNWGLCHOOSEPIXELFORMATARBPROC)(HDC hdc, const int* piAttribIList,
const FLOAT* pfAttribFList, UINT nMaxFormats,
int* piFormats, UINT* nNumFormats);
#endif /* WGL_ARB_pixel_format */
#ifndef WGL_ARB_create_context
#define WGL_ARB_create_context 1
#define WGL_CONTEXT_DEBUG_BIT_ARB 0x00000001
#define WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB 0x00000002
#define WGL_CONTEXT_MAJOR_VERSION_ARB 0x2091
#define WGL_CONTEXT_MINOR_VERSION_ARB 0x2092
#define WGL_CONTEXT_LAYER_PLANE_ARB 0x2093
#define WGL_CONTEXT_FLAGS_ARB 0x2094
#define ERROR_INVALID_VERSION_ARB 0x2095
typedef HGLRC(WINAPI* PFNWGLCREATECONTEXTATTRIBSARBPROC)(HDC hDC, HGLRC hShareContext,
const int* attribList);
#endif /* WGL_ARB_create_context */
#ifndef WGL_ARB_create_context_profile
#define WGL_ARB_create_context_profile 1
#define WGL_CONTEXT_PROFILE_MASK_ARB 0x9126
#define WGL_CONTEXT_CORE_PROFILE_BIT_ARB 0x00000001
#define WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB 0x00000002
#define ERROR_INVALID_PROFILE_ARB 0x2096
#endif /* WGL_ARB_create_context_profile */
#ifndef WGL_EXT_swap_control
#define WGL_EXT_swap_control 1
typedef BOOL(WINAPI* PFNWGLSWAPINTERVALEXTPROC)(int interval);
typedef int(WINAPI* PFNWGLGETSWAPINTERVALEXTPROC)(void);
#endif /* WGL_EXT_swap_control */
// Persistent pointers
static PFNWGLSWAPINTERVALEXTPROC wglSwapIntervalEXT = nullptr;
static PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB = nullptr;
static PFNWGLCHOOSEPIXELFORMATARBPROC wglChoosePixelFormatARB = nullptr;
static PFNWGLCREATEPBUFFERARBPROC wglCreatePbufferARB = nullptr;
static PFNWGLGETPBUFFERDCARBPROC wglGetPbufferDCARB = nullptr;
static PFNWGLRELEASEPBUFFERDCARBPROC wglReleasePbufferDCARB = nullptr;
static PFNWGLDESTROYPBUFFERARBPROC wglDestroyPbufferARB = nullptr;
static void LoadWGLExtensions()
{
wglSwapIntervalEXT = reinterpret_cast<PFNWGLSWAPINTERVALEXTPROC>(
GLInterface->GetFuncAddress("wglSwapIntervalEXT"));
wglCreateContextAttribsARB = reinterpret_cast<PFNWGLCREATECONTEXTATTRIBSARBPROC>(
wglGetProcAddress("wglCreateContextAttribsARB"));
wglChoosePixelFormatARB = reinterpret_cast<PFNWGLCHOOSEPIXELFORMATARBPROC>(
wglGetProcAddress("wglChoosePixelFormatARB"));
wglCreatePbufferARB =
reinterpret_cast<PFNWGLCREATEPBUFFERARBPROC>(wglGetProcAddress("wglCreatePbufferARB"));
wglGetPbufferDCARB =
reinterpret_cast<PFNWGLGETPBUFFERDCARBPROC>(wglGetProcAddress("wglGetPbufferDCARB"));
wglReleasePbufferDCARB =
reinterpret_cast<PFNWGLRELEASEPBUFFERDCARBPROC>(wglGetProcAddress("wglReleasePbufferDCARB"));
wglDestroyPbufferARB =
reinterpret_cast<PFNWGLDESTROYPBUFFERARBPROC>(wglGetProcAddress("wglGetPbufferDCARB"));
}
static void ClearWGLExtensionPointers()
{
wglSwapIntervalEXT = nullptr;
wglCreateContextAttribsARB = nullptr;
wglChoosePixelFormatARB = nullptr;
wglCreatePbufferARB = nullptr;
wglGetPbufferDCARB = nullptr;
wglReleasePbufferDCARB = nullptr;
wglDestroyPbufferARB = nullptr;
}
void cInterfaceWGL::SwapInterval(int Interval)
{
@ -26,14 +166,20 @@ void cInterfaceWGL::SwapInterval(int Interval)
}
void cInterfaceWGL::Swap()
{
SwapBuffers(hDC);
SwapBuffers(m_dc);
}
void* cInterfaceWGL::GetFuncAddress(const std::string& name)
{
void* func = (void*)wglGetProcAddress((LPCSTR)name.c_str());
FARPROC func = wglGetProcAddress(name.c_str());
if (func == nullptr)
func = (void*)GetProcAddress(dllHandle, (LPCSTR)name.c_str());
{
// Using GetModuleHandle here is okay, since we import functions from opengl32.dll, it's
// guaranteed to be loaded.
HMODULE opengl_module = GetModuleHandle(TEXT("opengl32.dll"));
func = GetProcAddress(opengl_module, name.c_str());
}
return func;
}
@ -56,92 +202,268 @@ bool cInterfaceWGL::PeekMessages()
// Call browser: Core.cpp:EmuThread() > main.cpp:Video_Initialize()
bool cInterfaceWGL::Create(void* window_handle, bool core)
{
if (window_handle == nullptr)
if (!window_handle)
return false;
HWND window_handle_reified = reinterpret_cast<HWND>(window_handle);
RECT window_rect = {0};
if (!GetClientRect(window_handle_reified, &window_rect))
RECT window_rect = {};
m_window_handle = reinterpret_cast<HWND>(window_handle);
if (!GetClientRect(m_window_handle, &window_rect))
return false;
// Clear extension function pointers before creating the first context.
ClearWGLExtensionPointers();
// Control window size and picture scaling
int twidth = (window_rect.right - window_rect.left);
int theight = (window_rect.bottom - window_rect.top);
int twidth = window_rect.right - window_rect.left;
int theight = window_rect.bottom - window_rect.top;
s_backbuffer_width = twidth;
s_backbuffer_height = theight;
m_window_handle = window_handle_reified;
static constexpr PIXELFORMATDESCRIPTOR pfd = {
sizeof(PIXELFORMATDESCRIPTOR), // Size Of This Pixel Format Descriptor
1, // Version Number
PFD_DRAW_TO_WINDOW | // Format Must Support Window
PFD_SUPPORT_OPENGL | // Format Must Support OpenGL
PFD_DOUBLEBUFFER, // Must Support Double Buffering
PFD_TYPE_RGBA, // Request An RGBA Format
32, // Select Our Color Depth
0,
0, 0, 0, 0, 0, // Color Bits Ignored
0, // 8bit Alpha Buffer
0, // Shift Bit Ignored
0, // No Accumulation Buffer
0, 0, 0, 0, // Accumulation Bits Ignored
0, // 0Bit Z-Buffer (Depth Buffer)
0, // 0bit Stencil Buffer
0, // No Auxiliary Buffer
PFD_MAIN_PLANE, // Main Drawing Layer
0, // Reserved
0, 0, 0 // Layer Masks Ignored
};
dllHandle = LoadLibrary(TEXT("OpenGL32.dll"));
PIXELFORMATDESCRIPTOR pfd = // pfd Tells Windows How We Want Things To Be
{
sizeof(PIXELFORMATDESCRIPTOR), // Size Of This Pixel Format Descriptor
1, // Version Number
PFD_DRAW_TO_WINDOW | // Format Must Support Window
PFD_SUPPORT_OPENGL | // Format Must Support OpenGL
PFD_DOUBLEBUFFER, // Must Support Double Buffering
PFD_TYPE_RGBA, // Request An RGBA Format
32, // Select Our Color Depth
0,
0, 0, 0, 0, 0, // Color Bits Ignored
0, // 8bit Alpha Buffer
0, // Shift Bit Ignored
0, // No Accumulation Buffer
0, 0, 0, 0, // Accumulation Bits Ignored
0, // 0Bit Z-Buffer (Depth Buffer)
0, // 0bit Stencil Buffer
0, // No Auxiliary Buffer
PFD_MAIN_PLANE, // Main Drawing Layer
0, // Reserved
0, 0, 0 // Layer Masks Ignored
};
int PixelFormat; // Holds The Results After Searching For A Match
if (!(hDC = GetDC(window_handle_reified)))
m_dc = GetDC(m_window_handle);
if (!m_dc)
{
PanicAlert("(1) Can't create an OpenGL Device context. Fail.");
return false;
}
if (!(PixelFormat = ChoosePixelFormat(hDC, &pfd)))
int pixel_format;
if (!(pixel_format = ChoosePixelFormat(m_dc, &pfd)))
{
PanicAlert("(2) Can't find a suitable PixelFormat.");
return false;
}
if (!SetPixelFormat(hDC, PixelFormat, &pfd))
if (!SetPixelFormat(m_dc, pixel_format, &pfd))
{
PanicAlert("(3) Can't set the PixelFormat.");
return false;
}
if (!(hRC = wglCreateContext(hDC)))
if (!(m_rc = wglCreateContext(m_dc)))
{
PanicAlert("(4) Can't create an OpenGL rendering context.");
return false;
}
// WGL only supports desktop GL, for now.
if (s_opengl_mode == GLInterfaceMode::MODE_DETECT)
s_opengl_mode = GLInterfaceMode::MODE_OPENGL;
if (core)
{
// Make the fallback context current, temporarily.
// This is because we need an active context to use wglCreateContextAttribsARB.
if (!wglMakeCurrent(m_dc, m_rc))
{
PanicAlert("(5) Can't make dummy WGL context current.");
return false;
}
// Load WGL extension function pointers.
LoadWGLExtensions();
// Attempt creating a core context.
HGLRC core_context = CreateCoreContext(m_dc, nullptr);
// Switch out the temporary context before continuing, regardless of whether we got a core
// context. If we didn't get a core context, the caller expects that the context is not current.
if (!wglMakeCurrent(m_dc, nullptr))
{
PanicAlert("(6) Failed to switch out temporary context");
return false;
}
// If we got a core context, destroy and replace the temporary context.
if (core_context)
{
wglDeleteContext(m_rc);
m_rc = core_context;
m_core = true;
}
else
{
WARN_LOG(VIDEO, "Failed to create a core OpenGL context. Using fallback context.");
}
}
return true;
}
bool cInterfaceWGL::Create(cInterfaceBase* main_context)
{
cInterfaceWGL* wgl_main_context = static_cast<cInterfaceWGL*>(main_context);
// WGL does not support surfaceless contexts, so we use a 1x1 pbuffer instead.
if (!CreatePBuffer(wgl_main_context->m_dc, 1, 1, &m_pbuffer_handle, &m_dc))
return false;
m_rc = CreateCoreContext(m_dc, wgl_main_context->m_rc);
if (!m_rc)
return false;
m_core = true;
return true;
}
std::unique_ptr<cInterfaceBase> cInterfaceWGL::CreateSharedContext()
{
std::unique_ptr<cInterfaceWGL> context = std::make_unique<cInterfaceWGL>();
if (!context->Create(this))
{
context->Shutdown();
return nullptr;
}
return std::move(context);
}
HGLRC cInterfaceWGL::CreateCoreContext(HDC dc, HGLRC share_context)
{
if (!wglCreateContextAttribsARB)
{
WARN_LOG(VIDEO, "Missing WGL_ARB_create_context extension");
return nullptr;
}
// List of versions to attempt context creation for. (4.5-3.2, geometry shaders is a minimum
// requirement since we're using core profile)
static constexpr std::array<std::pair<int, int>, 8> try_versions = {
{{4, 5}, {4, 4}, {4, 3}, {4, 2}, {4, 1}, {4, 0}, {3, 3}, {3, 2}}};
for (const auto& version : try_versions)
{
// Construct list of attributes. Prefer a forward-compatible, core context.
std::array<int, 5 * 2> attribs = {
WGL_CONTEXT_PROFILE_MASK_ARB,
WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
#ifdef _DEBUG
WGL_CONTEXT_FLAGS_ARB,
WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB | WGL_CONTEXT_DEBUG_BIT_ARB,
#else
WGL_CONTEXT_FLAGS_ARB,
WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
#endif
WGL_CONTEXT_MAJOR_VERSION_ARB,
version.first,
WGL_CONTEXT_MINOR_VERSION_ARB,
version.second,
0,
0};
// Attempt creating this context.
HGLRC core_context = wglCreateContextAttribsARB(dc, nullptr, attribs.data());
if (core_context)
{
// If we're creating a shared context, share the resources before the context is used.
if (share_context)
{
if (!wglShareLists(share_context, core_context))
{
ERROR_LOG(VIDEO, "wglShareLists failed");
wglDeleteContext(core_context);
return nullptr;
}
}
INFO_LOG(VIDEO, "WGL: Created a GL %d.%d core context", version.first, version.second);
return core_context;
}
}
WARN_LOG(VIDEO, "Unable to create a core OpenGL context of an acceptable version");
return nullptr;
}
bool cInterfaceWGL::CreatePBuffer(HDC onscreen_dc, int width, int height, HANDLE* pbuffer_handle,
HDC* pbuffer_dc)
{
if (!wglChoosePixelFormatARB || !wglCreatePbufferARB || !wglGetPbufferDCARB ||
!wglReleasePbufferDCARB || !wglDestroyPbufferARB)
{
ERROR_LOG(VIDEO, "Missing WGL_ARB_pbuffer extension");
return false;
}
static constexpr std::array<int, 7 * 2> pf_iattribs = {
WGL_DRAW_TO_PBUFFER_ARB,
1, // Pixel format compatible with pbuffer rendering
WGL_RED_BITS_ARB,
0,
WGL_GREEN_BITS_ARB,
0,
WGL_BLUE_BITS_ARB,
0,
WGL_DEPTH_BITS_ARB,
0,
WGL_STENCIL_BITS_ARB,
0,
0,
0};
static constexpr std::array<float, 1 * 2> pf_fattribs = {};
int pixel_format;
UINT num_pixel_formats;
if (!wglChoosePixelFormatARB(onscreen_dc, pf_iattribs.data(), pf_fattribs.data(), 1,
&pixel_format, &num_pixel_formats))
{
ERROR_LOG(VIDEO, "Failed to obtain a compatible pbuffer pixel format");
return false;
}
static constexpr std::array<int, 1 * 2> pb_attribs = {};
HPBUFFERARB pbuffer =
wglCreatePbufferARB(onscreen_dc, pixel_format, width, height, pb_attribs.data());
if (!pbuffer)
{
ERROR_LOG(VIDEO, "Failed to create pbuffer");
return false;
}
HDC dc = wglGetPbufferDCARB(pbuffer);
if (!dc)
{
ERROR_LOG(VIDEO, "Failed to get drawing context from pbuffer");
wglDestroyPbufferARB(pbuffer);
return false;
}
*pbuffer_handle = pbuffer;
*pbuffer_dc = dc;
return true;
}
bool cInterfaceWGL::MakeCurrent()
{
bool success = wglMakeCurrent(hDC, hRC) ? true : false;
if (success)
{
// Grab the swap interval function pointer
wglSwapIntervalEXT =
(PFNWGLSWAPINTERVALEXTPROC)GLInterface->GetFuncAddress("wglSwapIntervalEXT");
}
return success;
return wglMakeCurrent(m_dc, m_rc) == TRUE;
}
bool cInterfaceWGL::ClearCurrent()
{
return wglMakeCurrent(hDC, nullptr) ? true : false;
return wglMakeCurrent(m_dc, nullptr) == TRUE;
}
// Update window width, size and etc. Called from Render.cpp
@ -151,28 +473,40 @@ void cInterfaceWGL::Update()
GetClientRect(m_window_handle, &rcWindow);
// Get the new window width and height
s_backbuffer_width = (rcWindow.right - rcWindow.left);
s_backbuffer_height = (rcWindow.bottom - rcWindow.top);
s_backbuffer_width = rcWindow.right - rcWindow.left;
s_backbuffer_height = rcWindow.bottom - rcWindow.top;
}
// Close backend
void cInterfaceWGL::Shutdown()
{
if (hRC)
if (m_rc)
{
if (!wglMakeCurrent(nullptr, nullptr))
if (!wglMakeCurrent(m_dc, nullptr))
NOTICE_LOG(VIDEO, "Could not release drawing context.");
if (!wglDeleteContext(hRC))
if (!wglDeleteContext(m_rc))
ERROR_LOG(VIDEO, "Attempt to release rendering context failed.");
hRC = nullptr;
m_rc = nullptr;
}
if (hDC && !ReleaseDC(m_window_handle, hDC))
if (m_dc)
{
ERROR_LOG(VIDEO, "Attempt to release device context failed.");
hDC = nullptr;
if (m_pbuffer_handle)
{
wglReleasePbufferDCARB(static_cast<HPBUFFERARB>(m_pbuffer_handle), m_dc);
m_dc = nullptr;
wglDestroyPbufferARB(static_cast<HPBUFFERARB>(m_pbuffer_handle));
m_pbuffer_handle = nullptr;
}
else
{
if (!ReleaseDC(m_window_handle, m_dc))
ERROR_LOG(VIDEO, "Attempt to release device context failed.");
m_dc = nullptr;
}
}
FreeLibrary(dllHandle);
}

10
Source/Core/Common/GL/GLInterface/WGL.h
View File

@ -14,6 +14,7 @@ public:
void Swap() override;
void* GetFuncAddress(const std::string& name) override;
bool Create(void* window_handle, bool core) override;
bool Create(cInterfaceBase* main_context) override;
bool MakeCurrent() override;
bool ClearCurrent() override;
void Shutdown() override;
@ -21,6 +22,15 @@ public:
void Update() override;
bool PeekMessages() override;
std::unique_ptr<cInterfaceBase> CreateSharedContext() override;
private:
static HGLRC CreateCoreContext(HDC dc, HGLRC share_context);
static bool CreatePBuffer(HDC onscreen_dc, int width, int height, HANDLE* pbuffer_handle,
HDC* pbuffer_dc);
HWND m_window_handle = nullptr;
HANDLE m_pbuffer_handle = nullptr;
HDC m_dc = nullptr;
HGLRC m_rc = nullptr;
};