// Copyright 2018 The SwiftShader Authors. All Rights Reserved.
//
// 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.

// main.cpp: DLL entry point.

#if defined(_WIN32)
#	include "resource.h"
#	include <windows.h>

#	ifdef DEBUGGER_WAIT_DIALOG
static INT_PTR CALLBACK DebuggerWaitDialogProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	RECT rect;

	switch(uMsg)
	{
		case WM_INITDIALOG:
			GetWindowRect(GetDesktopWindow(), &rect);
			SetWindowPos(hwnd, HWND_TOP, rect.right / 2, rect.bottom / 2, 0, 0, SWP_NOSIZE);
			SetTimer(hwnd, 1, 100, NULL);
			return TRUE;
		case WM_COMMAND:
			if(LOWORD(wParam) == IDCANCEL)
			{
				EndDialog(hwnd, 0);
			}
			break;
		case WM_TIMER:
			if(IsDebuggerPresent())
			{
				EndDialog(hwnd, 0);
			}
	}

	return FALSE;
}

static void WaitForDebugger(HINSTANCE instance)
{
	if(!IsDebuggerPresent())
	{
		HRSRC dialog = FindResource(instance, MAKEINTRESOURCE(IDD_DIALOG1), RT_DIALOG);
		DLGTEMPLATE *dialogTemplate = (DLGTEMPLATE *)LoadResource(instance, dialog);
		DialogBoxIndirect(instance, dialogTemplate, NULL, DebuggerWaitDialogProc);
	}
}
#	endif

extern "C" BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, LPVOID reserved)
{
	switch(reason)
	{
		case DLL_PROCESS_ATTACH:
#	ifdef DEBUGGER_WAIT_DIALOG
		{
			char disable_debugger_wait_dialog[] = "0";
			GetEnvironmentVariable("SWIFTSHADER_DISABLE_DEBUGGER_WAIT_DIALOG", disable_debugger_wait_dialog, sizeof(disable_debugger_wait_dialog));

			if(disable_debugger_wait_dialog[0] != '1')
			{
				WaitForDebugger(instance);
			}
		}
#	endif
		break;
		case DLL_THREAD_ATTACH:
		case DLL_THREAD_DETACH:
		case DLL_PROCESS_DETACH:
		default:
			break;
	}

	return TRUE;
}
#endif