/*
    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.
*/

#include "video.h"
#include <cassert>
#include <stdio.h>

unsigned int *              g_pImg = 0;
int                         g_sizex, g_sizey;
static video *g_video = 0;
static int g_fps = 0;

#if _WIN32 || _WIN64

static DWORD g_msec = 0;
#ifdef _WINDOWS
HINSTANCE video::win_hInstance = 0;
int video::win_iCmdShow = 0;
void video::win_set_class(WNDCLASSEX &wcex) { }
void video::win_load_accelerators(int idc)  { }
#endif //_WINDOWS

#else

#include <sched.h>
#include <sys/time.h>
struct timeval g_time;

#endif //_WIN32||_WIN64

video::video()
    // OpenGL* RGBA byte order for little-endian CPU
    : red_mask(0xff), red_shift(0), green_mask(0xff00),
      green_shift(8), blue_mask(0xff0000), blue_shift(16), depth(24)
{
    assert(g_video == 0);
    g_video = this; title = "Video"; updating = calc_fps = false;
}

bool video::init_window(int x, int y)
{
    g_sizex = x; g_sizey = y;
    g_pImg = new unsigned int[x*y];
    running = true;
    return false;
}

bool video::init_console()
{
    running = true;
    return true;
}

void video::terminate()
{
    if(calc_fps) {
        double fps = g_fps;
#if _WIN32 || _WIN64
        fps /= (GetTickCount()-g_msec)/1000.0;
#else
        struct timezone tz; struct timeval end_time; gettimeofday(&end_time, &tz);
        fps /= (end_time.tv_sec+1.0*end_time.tv_usec/1000000.0) - (g_time.tv_sec+1.0*g_time.tv_usec/1000000.0);
#endif
        printf("%s: %.1f fps\n", title, fps);
  	}
    g_video = 0; running = false;
    if(g_pImg) { delete[] g_pImg; g_pImg = 0; }
}

video::~video()
{
    if(g_video) terminate();
}

//! Count and display FPS count in titlebar
bool video::next_frame()
{
    if(calc_fps){
	    if(!g_fps) {
#if _WIN32 || _WIN64
            g_msec = GetTickCount();
#else
            struct timezone tz; gettimeofday(&g_time, &tz);
#endif
	    }
        g_fps++;
    }
    return running;
}

//! Do standard loop
void video::main_loop()
{
    on_process();
}

//! Change window title
void video::show_title()
{
}

///////////////////////////////////////////// public methods of video class ///////////////////////

drawing_area::drawing_area(int x, int y, int sizex, int sizey)
    : start_x(x), start_y(y), size_x(sizex), size_y(sizey), pixel_depth(24),
    base_index(y*g_sizex + x), max_index(g_sizex*g_sizey), index_stride(g_sizex), ptr32(g_pImg)
{
    assert(x < g_sizex); assert(y < g_sizey);
    assert(x+sizex <= g_sizex); assert(y+sizey <= g_sizey);

    index = base_index; // current index
}

void drawing_area::update() {}