glwin32.c

video linux conference

/*****************************************************************************
 * glwin32.c: Windows OpenGL provider
 *****************************************************************************
 * Copyright (C) 2001-2004 VideoLAN
 * $Id: glwin32.c 11257 2005-06-02 17:06:00Z fkuehne $
 *
 * Authors: Gildas Bazin <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

#include <errno.h>                                                 /* ENOMEM */
#include <stdlib.h>                                                /* free() */
#include <string.h>                                            /* strerror() */

#include <vlc/vlc.h>
#include <vlc/intf.h>
#include <vlc/vout.h>

#include <windows.h>
#include <ddraw.h>
#include <commctrl.h>

#include <multimon.h>
#undef GetSystemMetrics

#ifndef MONITOR_DEFAULTTONEAREST
#   define MONITOR_DEFAULTTONEAREST 2
#endif

#include <GL/gl.h>

#include "vout.h"

/*****************************************************************************
 * Local prototypes.
 *****************************************************************************/
static int  OpenVideo  ( vlc_object_t * );
static void CloseVideo ( vlc_object_t * );

static int  Init      ( vout_thread_t * );
static void End       ( vout_thread_t * );
static int  Manage    ( vout_thread_t * );
static void GLSwapBuffers( vout_thread_t * );

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
vlc_module_begin();
    set_category( CAT_VIDEO );
    set_subcategory( SUBCAT_VIDEO_VOUT );
    set_shortname( "OpenGL" );
    set_description( _("OpenGL video output") );
    set_capability( "opengl provider", 100 );
    add_shortcut( "glwin32" );
    set_callbacks( OpenVideo, CloseVideo );

    /* FIXME: Hack to avoid unregistering our window class */
    linked_with_a_crap_library_which_uses_atexit( );
vlc_module_end();

#if 0 /* FIXME */
    /* check if we registered a window class because we need to
     * unregister it */
    WNDCLASS wndclass;
    if( GetClassInfo( GetModuleHandle(NULL), "VLC DirectX", &wndclass ) )
        UnregisterClass( "VLC DirectX", GetModuleHandle(NULL) );
#endif

/*****************************************************************************
 * OpenVideo: allocate OpenGL provider
 *****************************************************************************
 * This function creates and initializes a video window.
 *****************************************************************************/
static int OpenVideo( vlc_object_t *p_this )
{
    vout_thread_t * p_vout = (vout_thread_t *)p_this;
    vlc_value_t val;

    /* Allocate structure */
    p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
    if( p_vout->p_sys == NULL )
    {
        msg_Err( p_vout, "out of memory" );
        return VLC_ENOMEM;
    }
    memset( p_vout->p_sys, 0, sizeof( vout_sys_t ) );

    /* Initialisations */
    p_vout->pf_init = Init;
    p_vout->pf_end = End;
    p_vout->pf_manage = Manage;
    p_vout->pf_swap = GLSwapBuffers;

    p_vout->p_sys->p_ddobject = NULL;
    p_vout->p_sys->p_display = NULL;
    p_vout->p_sys->p_current_surface = NULL;
    p_vout->p_sys->p_clipper = NULL;
    p_vout->p_sys->hwnd = p_vout->p_sys->hvideownd = NULL;
    p_vout->p_sys->hparent = p_vout->p_sys->hfswnd = NULL;
    p_vout->p_sys->i_changes = 0;
    p_vout->p_sys->b_wallpaper = 0;
    vlc_mutex_init( p_vout, &p_vout->p_sys->lock );
    SetRectEmpty( &p_vout->p_sys->rect_display );
    SetRectEmpty( &p_vout->p_sys->rect_parent );

    var_Create( p_vout, "video-title", VLC_VAR_STRING | VLC_VAR_DOINHERIT );

    p_vout->p_sys->b_cursor_hidden = 0;
    p_vout->p_sys->i_lastmoved = mdate();

    /* Set main window's size */
    p_vout->p_sys->i_window_width = p_vout->i_window_width;
    p_vout->p_sys->i_window_height = p_vout->i_window_height;

    /* Create the DirectXEventThread, this thread is created by us to isolate
     * the Win32 PeekMessage function calls. We want to do this because
     * Windows can stay blocked inside this call for a long time, and when
     * this happens it thus blocks vlc's video_output thread.
     * DirectXEventThread will take care of the creation of the video
     * window (because PeekMessage has to be called from the same thread which
     * created the window). */
    msg_Dbg( p_vout, "creating DirectXEventThread" );
    p_vout->p_sys->p_event =
        vlc_object_create( p_vout, sizeof(event_thread_t) );
    p_vout->p_sys->p_event->p_vout = p_vout;
    if( vlc_thread_create( p_vout->p_sys->p_event, "DirectX Events Thread",
                           E_(DirectXEventThread), 0, 1 ) )
    {
        msg_Err( p_vout, "cannot create DirectXEventThread" );
        vlc_object_destroy( p_vout->p_sys->p_event );
        p_vout->p_sys->p_event = NULL;
        goto error;
    }

    if( p_vout->p_sys->p_event->b_error )
    {
        msg_Err( p_vout, "DirectXEventThread failed" );
        goto error;
    }

    vlc_object_attach( p_vout->p_sys->p_event, p_vout );

    msg_Dbg( p_vout, "DirectXEventThread running" );

    /* Variable to indicate if the window should be on top of others */
    /* Trigger a callback right now */
    var_Get( p_vout, "video-on-top", &val );
    var_Set( p_vout, "video-on-top", val );

    return VLC_SUCCESS;

 error:
    CloseVideo( VLC_OBJECT(p_vout) );
    return VLC_EGENERIC;
}

/*****************************************************************************
 * Init: initialize video thread output method
 *****************************************************************************/
static int Init( vout_thread_t *p_vout )
{
    PIXELFORMATDESCRIPTOR pfd;
    int iFormat;

    /* Change the window title bar text */
    PostMessage( p_vout->p_sys->hwnd, WM_VLC_CHANGE_TEXT, 0, 0 );

    p_vout->p_sys->hGLDC = GetDC( p_vout->p_sys->hvideownd );

    /* Set the pixel format for the DC */
    memset( &pfd, 0, sizeof( pfd ) );
    pfd.nSize = sizeof( pfd );
    pfd.nVersion = 1;
    pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
    pfd.iPixelType = PFD_TYPE_RGBA;
    pfd.cColorBits = 24;
    pfd.cDepthBits = 16;
    pfd.iLayerType = PFD_MAIN_PLANE;
    iFormat = ChoosePixelFormat( p_vout->p_sys->hGLDC, &pfd );
    SetPixelFormat( p_vout->p_sys->hGLDC, iFormat, &pfd );

    /* Create and enable the render context */
    p_vout->p_sys->hGLRC = wglCreateContext( p_vout->p_sys->hGLDC );
    wglMakeCurrent( p_vout->p_sys->hGLDC, p_vout->p_sys->hGLRC );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * End: terminate Sys video thread output method
 *****************************************************************************
 * Terminate an output method created by Create.
 * It is called at the end of the thread.
 *****************************************************************************/
static void End( vout_thread_t *p_vout )
{
    wglMakeCurrent( NULL, NULL );
    wglDeleteContext( p_vout->p_sys->hGLRC );
    ReleaseDC( p_vout->p_sys->hvideownd, p_vout->p_sys->hGLDC );
    return;
}

/*****************************************************************************
 * CloseVideo: destroy Sys video thread output method
 *****************************************************************************
 * Terminate an output method created by Create
 *****************************************************************************/
static void CloseVideo( vlc_object_t *p_this )
{
    vout_thread_t * p_vout = (vout_thread_t *)p_this;

    msg_Dbg( p_vout, "CloseVideo" );

    if( p_vout->p_sys->p_event )
    {
        vlc_object_detach( p_vout->p_sys->p_event );

        /* Kill DirectXEventThread */
        p_vout->p_sys->p_event->b_die = VLC_TRUE;

        /* we need to be sure DirectXEventThread won't stay stuck in
         * GetMessage, so we send a fake message */
        if( p_vout->p_sys->hwnd )
        {
            PostMessage( p_vout->p_sys->hwnd, WM_NULL, 0, 0);