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/*
Copyright 2005-2014 Intel Corporation. All Rights Reserved.
This file is part of Threading Building Blocks.
Threading Building Blocks is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation.
Threading Building Blocks is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with Threading Building Blocks; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
As a special exception, you may use this file as part of a free software library without restriction. Specifically, if other files instantiate templates or use macros or inline functions from this file, or you compile this file and link it with other files to produce an executable, this file does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU General Public License.*/
/////// Common internal implementation of Windows-specific stuff //////////////
/////// Must be the first included header //////////////
#ifndef __WINVIDEO_H__
#define __WINVIDEO_H__
#ifndef _CRT_SECURE_NO_DEPRECATE
#define _CRT_SECURE_NO_DEPRECATE
#endif
// Check that the target Windows version has all API calls requried.
#ifndef _WIN32_WINNT
# define _WIN32_WINNT 0x0400
#endif
#if _WIN32_WINNT<0x0400
# define YIELD_TO_THREAD() Sleep(0)
#else
# define YIELD_TO_THREAD() SwitchToThread()
#endif
#include "video.h"
#include <fcntl.h>
#include <io.h>
#include <iostream>
#include <fstream>
#pragma comment(lib, "gdi32.lib")
#pragma comment(lib, "user32.lib")
// maximum mumber of lines the output console should have
static const WORD MAX_CONSOLE_LINES = 500;const COLORREF RGBKEY = RGB(8, 8, 16); // at least 8 for 16-bit palette
HWND g_hAppWnd; // The program's window handle
HANDLE g_handles[2] = {0,0};// thread and wake up event
unsigned int * g_pImg = 0; // drawing memory
int g_sizex, g_sizey;static video * g_video = 0;WNDPROC g_pUserProc = 0;HINSTANCE video::win_hInstance = 0;int video::win_iCmdShow = 0;static WNDCLASSEX * gWndClass = 0;static HACCEL hAccelTable = 0;static DWORD g_msec = 0;static int g_fps = 0, g_updates = 0, g_skips = 0;
bool DisplayError(LPSTR lpstrErr, HRESULT hres = 0); // always returns false
LRESULT CALLBACK InternalWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
//! Create window
bool WinInit(HINSTANCE hInstance, int nCmdShow, WNDCLASSEX *uwc, const char *title, bool fixedsize){ WNDCLASSEX wndclass; // Our app's windows class
if(uwc) { memcpy(&wndclass, uwc, sizeof(wndclass)); g_pUserProc = uwc->lpfnWndProc; } else { memset(&wndclass, 0, sizeof(wndclass)); wndclass.hCursor = LoadCursor(NULL, IDC_ARROW); wndclass.lpszClassName = title; } wndclass.cbSize = sizeof(wndclass); wndclass.hInstance = hInstance; wndclass.lpfnWndProc = InternalWndProc; wndclass.style |= CS_HREDRAW | CS_VREDRAW; wndclass.hbrBackground = CreateSolidBrush(RGBKEY);
if( !RegisterClassExA(&wndclass) ) return false; int xaddend = GetSystemMetrics(fixedsize?SM_CXFIXEDFRAME:SM_CXFRAME)*2; int yaddend = GetSystemMetrics(fixedsize?SM_CYFIXEDFRAME:SM_CYFRAME)*2 + GetSystemMetrics(SM_CYCAPTION); if(wndclass.lpszMenuName) yaddend += GetSystemMetrics(SM_CYMENU);
// Setup the new window's physical parameters - and tell Windows to create it
g_hAppWnd = CreateWindowA(wndclass.lpszClassName, // Window class name
title, // Window caption
!fixedsize ? WS_OVERLAPPEDWINDOW : // Window style
WS_OVERLAPPED|WS_CAPTION|WS_SYSMENU|WS_MINIMIZEBOX, CW_USEDEFAULT, // Initial x pos: use default placement
0, // Initial y pos: not used here
g_sizex+xaddend,// Initial x size
g_sizey+yaddend,// Initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL); // Creation parameters
return g_hAppWnd != NULL;}
//! create console window with redirection
static bool RedirectIOToConsole(void){ int hConHandle; size_t lStdHandle; CONSOLE_SCREEN_BUFFER_INFO coninfo; FILE *fp; // allocate a console for this app
AllocConsole();
// set the screen buffer to be big enough to let us scroll text
GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &coninfo); coninfo.dwSize.Y = MAX_CONSOLE_LINES; SetConsoleScreenBufferSize(GetStdHandle(STD_OUTPUT_HANDLE), coninfo.dwSize);
// redirect unbuffered STDOUT to the console
lStdHandle = (size_t)GetStdHandle(STD_OUTPUT_HANDLE); hConHandle = _open_osfhandle(lStdHandle, _O_TEXT); if(hConHandle <= 0) return false; fp = _fdopen( hConHandle, "w" ); *stdout = *fp; setvbuf( stdout, NULL, _IONBF, 0 );
// redirect unbuffered STDERR to the console
lStdHandle = (size_t)GetStdHandle(STD_ERROR_HANDLE); hConHandle = _open_osfhandle(lStdHandle, _O_TEXT); if(hConHandle > 0) { fp = _fdopen( hConHandle, "w" ); *stderr = *fp; setvbuf( stderr, NULL, _IONBF, 0 ); }
// redirect unbuffered STDIN to the console
lStdHandle = (size_t)GetStdHandle(STD_INPUT_HANDLE); hConHandle = _open_osfhandle(lStdHandle, _O_TEXT); if(hConHandle > 0) { fp = _fdopen( hConHandle, "r" ); *stdin = *fp; setvbuf( stdin, NULL, _IONBF, 0 ); }
// make cout, wcout, cin, wcin, wcerr, cerr, wclog and clog
// point to console as well
std::ios::sync_with_stdio(); return true;}
video::video() : red_mask(0xff0000), red_shift(16), green_mask(0xff00), green_shift(8), blue_mask(0xff), blue_shift(0), depth(24){ assert(g_video == 0); g_video = this; title = "Video"; running = threaded = calc_fps = false; updating = true;}
//! optionally call it just before init() to set own
void video::win_set_class(WNDCLASSEX &wcex){ gWndClass = &wcex;}
void video::win_load_accelerators(int idc){ hAccelTable = LoadAccelerators(win_hInstance, MAKEINTRESOURCE(idc));}
bool video::init_console(){ if(RedirectIOToConsole()) { if(!g_pImg && g_sizex && g_sizey) g_pImg = new unsigned int[g_sizex * g_sizey]; if(g_pImg) running = true; return true; } return false;}
video::~video(){ if(g_video) terminate();}
DWORD WINAPI thread_video(LPVOID lpParameter){ video *v = (video*)lpParameter; v->on_process(); return 0;}
static bool loop_once(video *v){ // screen update notify
if(int updates = g_updates) { g_updates = 0; if(g_video->updating) { g_skips += updates-1; g_fps++; } else g_skips += updates; UpdateWindow(g_hAppWnd); } // update fps
DWORD msec = GetTickCount(); if(v->calc_fps && msec >= g_msec+1000) { double sec = (msec - g_msec)/1000.0; char buffer[256], n = _snprintf(buffer, 128, "%s: %d fps", v->title, int(double(g_fps + g_skips)/sec)); if(g_skips) _snprintf(buffer+n, 128, " - %d skipped = %d updates", int(g_skips/sec), int(g_fps/sec)); SetWindowTextA(g_hAppWnd, buffer); g_msec = msec; g_skips = g_fps = 0; } // event processing, including painting
MSG msg; if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)){ if( msg.message == WM_QUIT ) { v->running = false; return false; } if( !hAccelTable || !TranslateAccelerator(msg.hwnd, hAccelTable, &msg) ){ TranslateMessage(&msg); DispatchMessage(&msg); } return true; // try again
} return false;}
//! Do standard event loop
void video::main_loop(){ // let Windows draw and unroll the window
InvalidateRect(g_hAppWnd, 0, false); g_msec = GetTickCount(); // let's stay for 0,5 sec
while(g_msec + 500 > GetTickCount()) { loop_once(this); Sleep(1); } g_msec = GetTickCount(); // now, start main process
if(threaded) { g_handles[0] = CreateThread ( NULL, // LPSECURITY_ATTRIBUTES security_attrs
0, // SIZE_T stacksize
(LPTHREAD_START_ROUTINE) thread_video, this, // argument
0, 0); if(!g_handles[0]) { DisplayError("Can't create thread"); return; } else // harmless race is possible here
g_handles[1] = CreateEvent(NULL, false, false, NULL); while(running) { while(loop_once(this)); YIELD_TO_THREAD(); // give time for processing when running on single CPU
DWORD r = MsgWaitForMultipleObjects(2, g_handles, false, INFINITE, QS_ALLINPUT^QS_MOUSEMOVE); if(r == WAIT_OBJECT_0) break; // thread terminated
} running = false; if(WaitForSingleObject(g_handles[0], 3000) == WAIT_TIMEOUT){ // there was not enough time for graceful shutdown, killing the example with code 1.
exit(1); } if(g_handles[0]) CloseHandle(g_handles[0]); if(g_handles[1]) CloseHandle(g_handles[1]); g_handles[0] = g_handles[1] = 0; } else on_process();}
//! Refresh screen picture
bool video::next_frame(){ if(!running) return false; g_updates++; // Fast but inaccurate counter. The data race here is benign.
if(!threaded) while(loop_once(this)); else if(g_handles[1]) { SetEvent(g_handles[1]); YIELD_TO_THREAD(); } return true;}
//! Change window title
void video::show_title(){ if(g_hAppWnd) SetWindowTextA(g_hAppWnd, title);}
#endif //__WINVIDEO_H__
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