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// window.cpp
#include "window.h"
#pragma once
#include <stdio.h>
#ifdef _MSC_VER
#include <stddef.h>
#if (_MSC_VER < 1900)
#define snprintf sprintf_s
#endif
#endif
#if _WIN32
#include <Windows.h>
#else
#error "The slang-graphics library currently only supports Windows platforms"
#endif
namespace slang_graphics {
#if _WIN32
struct OSString
{
OSString(char const* begin, char const* end)
{
_initialize(begin, end - begin);
}
OSString(char const* begin)
{
_initialize(begin, strlen(begin));
}
~OSString()
{
free(mBegin);
}
operator WCHAR const*()
{
return mBegin;
}
private:
WCHAR* mBegin;
WCHAR* mEnd;
void _initialize(char const* input, size_t inputSize)
{
const DWORD dwFlags = 0;
int outputCodeUnitCount = ::MultiByteToWideChar(CP_UTF8, dwFlags, input, int(inputSize), nullptr, 0);
WCHAR* buffer = (WCHAR*)malloc(sizeof(WCHAR) * (outputCodeUnitCount + 1));
::MultiByteToWideChar(CP_UTF8, dwFlags, input, int(inputSize), buffer, outputCodeUnitCount);
buffer[outputCodeUnitCount] = 0;
mBegin = buffer;
mEnd = buffer + outputCodeUnitCount;
}
};
struct ApplicationContext
{
HINSTANCE instance;
int showCommand = SW_SHOWDEFAULT;
int resultCode = 0;
};
/// Run an application given the specified callback and command-line arguments.
int runApplication(
ApplicationFunc func,
int argc,
char const* const* argv)
{
ApplicationContext context;
context.instance = (HINSTANCE) GetModuleHandle(0);
func(&context);
return context.resultCode;
}
int runWindowsApplication(
ApplicationFunc func,
void* instance,
int showCommand)
{
ApplicationContext context;
context.instance = (HINSTANCE) instance;
context.showCommand = showCommand;
func(&context);
return context.resultCode;
}
struct Window
{
HWND handle;
};
static LRESULT CALLBACK windowProc(
HWND windowHandle,
UINT message,
WPARAM wParam,
LPARAM lParam)
{
// TODO: Actually implement some reasonable logic here.
switch (message)
{
case WM_CLOSE:
PostQuitMessage(0);
return 0;
}
return DefWindowProcW(windowHandle, message, wParam, lParam);
}
static ATOM createWindowClassAtom()
{
WNDCLASSEXW windowClassDesc;
windowClassDesc.cbSize = sizeof(windowClassDesc);
windowClassDesc.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
windowClassDesc.lpfnWndProc = &windowProc;
windowClassDesc.cbClsExtra = 0;
windowClassDesc.cbWndExtra = 0;
windowClassDesc.hInstance = (HINSTANCE) GetModuleHandle(0);
windowClassDesc.hIcon = 0;
windowClassDesc.hCursor = 0;
windowClassDesc.hbrBackground = 0;
windowClassDesc.lpszMenuName = 0;
windowClassDesc.lpszClassName = L"SlangGraphicsWindow";
windowClassDesc.hIconSm = 0;
ATOM windowClassAtom = RegisterClassExW(&windowClassDesc);
return windowClassAtom;
}
static ATOM getWindowClassAtom()
{
static ATOM windowClassAtom = createWindowClassAtom();
return windowClassAtom;
}
Window* createWindow(WindowDesc const& desc)
{
Window* window = new Window();
OSString windowTitle(desc.title);
DWORD windowExtendedStyle = 0;
DWORD windowStyle = 0;
HINSTANCE instance = (HINSTANCE) GetModuleHandle(0);
HWND windowHandle = CreateWindowExW(
windowExtendedStyle,
(LPWSTR) getWindowClassAtom(),
windowTitle,
windowStyle,
0, 0, // x, y
desc.width, desc.height,
NULL, // parent
NULL, // menu
instance,
window);
if(!windowHandle)
{
delete window;
return nullptr;
}
window->handle = windowHandle;
return window;
}
void showWindow(Window* window)
{
ShowWindow(window->handle, SW_SHOW);
}
void* getPlatformWindowHandle(Window* window)
{
return window->handle;
}
bool dispatchEvents(ApplicationContext* context)
{
for(;;)
{
MSG message;
int result = PeekMessageW(&message, NULL, 0, 0, PM_REMOVE);
if (result != 0)
{
if (message.message == WM_QUIT)
{
context->resultCode = (int)message.wParam;
return false;
}
TranslateMessage(&message);
DispatchMessageW(&message);
}
else
{
return true;
}
}
}
void exitApplication(ApplicationContext* context, int resultCode)
{
ExitProcess(resultCode);
}
int reportError(char const* message, ...)
{
va_list args;
va_start(args, message);
static const int kBufferSize = 1024;
char messageBuffer[kBufferSize];
vsnprintf(messageBuffer, kBufferSize - 1, message, args);
messageBuffer[kBufferSize - 1] = 0;
va_end(args);
fputs(messageBuffer, stderr);
OSString wideMessageBuffer(messageBuffer);
OutputDebugStringW(wideMessageBuffer);
return 1;
}
#else
// TODO: put an SDL version here
#endif
} // slang_graphics
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