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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.size() > 0 && buffer.size() > src.size());
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);
}
};
class Win32WindowApiImpl : public OsWindowApi
{
static constexpr wchar_t kClassName[] = L"Deimos window class";
bool m_class_registered = false;
void RegisterClass()
{
Expects(!m_class_registered);
WNDCLASSW wnd_class{};
wnd_class.lpfnWndProc = ::DefWindowProcW;
wnd_class.hInstance = ::GetModuleHandleW(nullptr);
wnd_class.lpszClassName = kClassName;
::RegisterClassW(&wnd_class);
m_class_registered = true;
}
public:
StatusOr<gsl::owner<OsWindowHandle*>> 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);
HWND hwnd = ::CreateWindowExW(
0, kClassName, title_w, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, width, height,
nullptr, nullptr, ::GetModuleHandle(nullptr), nullptr);
if (hwnd == nullptr)
{
return InternalError("Error while creating Win32 window");
}
::ShowWindow(hwnd, SW_SHOW);
return nullptr;
}
};
class Win32OsApiImpl : public OsApi
{
Win32ConsoleApiImpl m_console_api;
Win32DllApiImpl m_dll_api;
Win32VirtualMemoryApiImpl m_virtual_memory_api;
Win32WindowApiImpl m_window_api;
public:
Win32OsApiImpl()
{
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>();
auto* os_api = allocator_api->system->New<Win32OsApiImpl>();
api_registry->Set(os_api);
}
} // namespace deimos
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