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#include "deimos/core/os.h"
#include "deimos/core/api_registry.h"
#include "deimos/core/allocator.h"
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
namespace deimos
{
gsl::cwzstring Utf8ToUtf16Z(StringView src, Span<wchar_t> buffer)
{
Expects(!buffer.empty() && buffer.size() > src.size());
const int res = ::MultiByteToWideChar(CP_UTF8, 0, src.data(), (int)src.size_bytes(), buffer.data(), (int)buffer.size() - 1);
if (res < 0) { return L"< MBTWC ERROR >"; }
buffer[res] = L'\0';
return buffer.data();
}
class Win32ConsoleApiImpl : public OsConsoleApi
{
HANDLE m_stdout;
HANDLE m_stderr;
constexpr HANDLE Handle(OsConsoleType type) const
{
switch (type)
{
using enum OsConsoleType;
case kStdOut: return m_stdout;
case kStdErr: return m_stderr;
}
}
public:
Win32ConsoleApiImpl() :
m_stdout{::GetStdHandle(STD_OUTPUT_HANDLE)},
m_stderr{::GetStdHandle(STD_ERROR_HANDLE)}
{}
void Write(OsConsoleType type, Span<const std::byte> data) override
{
::WriteConsoleA(Handle(type), data.data(), (DWORD)data.size(), nullptr, nullptr);
}
};
class Win32DllApiImpl : public OsDllApi
{
public:
OsDll* Open(gsl::czstring name) override
{
return std::bit_cast<OsDll*>(::LoadLibraryA(name));
}
void* GetSymbol(OsDll* dll, gsl::czstring name) override
{
return std::bit_cast<void*>(::GetProcAddress(std::bit_cast<HMODULE>(dll), name));
}
};
class Win32VirtualMemoryApiImpl : public OsVirtualMemoryApi
{
public:
gsl::owner<void*> Map(int64_t size) override
{
return ::VirtualAlloc(nullptr, (SIZE_T)size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
}
void Unmap(gsl::owner<void*> ptr) override
{
::VirtualFree(ptr, 0, MEM_RELEASE);
}
gsl::owner<void*> Reserve(int64_t size) override
{
return ::VirtualAlloc(nullptr, (SIZE_T)size, MEM_RESERVE, PAGE_READWRITE);
}
void Commit(void* ptr, int64_t size) override
{
::VirtualAlloc(ptr, (SIZE_T)size, MEM_COMMIT, PAGE_READWRITE);
}
};
struct OsWindow
{
HWND hwnd{};
bool destroyed{};
bool quit_requested{};
};
class Win32WindowApiImpl : public OsWindowApi
{
static constexpr wchar_t kClassName[] = L"Deimos window class";
HINSTANCE m_hinstance;
Allocator* m_allocator;
bool m_class_registered = false;
static LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
if (uMsg == WM_CREATE)
{
const auto* create = (const CREATESTRUCT*)lParam; // NOLINT
::SetWindowLongPtrW(hwnd, GWLP_USERDATA, std::bit_cast<LONG_PTR>(create->lpCreateParams));
return 0;
}
auto* window = std::bit_cast<OsWindow*>(::GetWindowLongPtrW(hwnd, GWLP_USERDATA));
switch (uMsg)
{
case WM_CLOSE:
{
window->quit_requested = true;
::DestroyWindow(hwnd);
return 0;
}
case WM_DESTROY:
{
window->destroyed = true;
::PostQuitMessage(0);
return 0;
}
default:
return ::DefWindowProcW(hwnd, uMsg, wParam, lParam);
}
}
void RegisterClass()
{
Expects(!m_class_registered);
WNDCLASSW wnd_class{};
wnd_class.lpfnWndProc = WindowProc;
wnd_class.hInstance = m_hinstance;
wnd_class.lpszClassName = kClassName;
::RegisterClassW(&wnd_class);
m_class_registered = true;
}
public:
explicit Win32WindowApiImpl(Allocator* allocator) :
m_hinstance{::GetModuleHandleW(nullptr)},
m_allocator{allocator}
{}
StatusOr<gsl::owner<OsWindow*>> Create(gsl::czstring title, int32_t width, int32_t height) override
{
if (!m_class_registered)
{
RegisterClass();
}
Ensures(m_class_registered);
wchar_t title_w_buffer[128]{};
gsl::cwzstring title_w = Utf8ToUtf16Z(title, title_w_buffer);
auto* window = m_allocator->New<OsWindow>();
HWND hwnd = ::CreateWindowExW(
0, kClassName, title_w, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, width, height,
nullptr, nullptr, m_hinstance, window);
if (hwnd == nullptr)
{
return InternalError("Error while creating Win32 window");
}
::ShowWindow(hwnd, SW_SHOW);
window->hwnd = hwnd;
return window;
}
void Update(OsWindow* window) override
{
if (window->destroyed) { return; }
MSG msg;
while (::PeekMessageW(&msg, window->hwnd, 0, 0, PM_REMOVE) != 0)
{
TranslateMessage(&msg);
DispatchMessageW(&msg);
}
}
bool QuitRequested(const OsWindow* window) override
{
return window->quit_requested;
}
#if DEIMOS_OS_WIN32
void* Win32Hwnd(const OsWindow* window) override
{
return std::bit_cast<void*>(window->hwnd);
}
void* Win32Hinstance(const OsWindow*) override
{
return std::bit_cast<void*>(m_hinstance);
}
#endif
};
class Win32OsApiImpl : public OsApi
{
Win32ConsoleApiImpl m_console_api;
Win32DllApiImpl m_dll_api;
Win32VirtualMemoryApiImpl m_virtual_memory_api;
Win32WindowApiImpl m_window_api;
public:
explicit Win32OsApiImpl(Allocator* allocator) :
m_window_api(allocator)
{
console = &m_console_api;
dll = &m_dll_api;
virtual_memory = &m_virtual_memory_api;
window = &m_window_api;
}
};
void RegisterOsApi(ApiRegistry* api_registry)
{
auto* allocator_api = api_registry->Get<AllocatorApi>();
Allocator* allocator = allocator_api->CreateChild(allocator_api->system, "OS");
auto* os_api = allocator_api->system->New<Win32OsApiImpl>(allocator);
api_registry->Set(os_api);
}
} // namespace deimos
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