opengl.c

video linux conference

        /* Set the perpective */
        glMatrixMode( GL_PROJECTION );
        glLoadIdentity();
        glFrustum( -1.0, 1.0, -1.0, 1.0, 3.0, 20.0 );
        glMatrixMode( GL_MODELVIEW );
        glLoadIdentity();
        glTranslatef( 0.0, 0.0, - 5.0 );
    }

    if( p_sys->p_vout->pf_unlock )
    {
        p_sys->p_vout->pf_unlock( p_sys->p_vout );
    }

    return 0;
}

/*****************************************************************************
 * End: terminate GLX video thread output method
 *****************************************************************************/
static void End( vout_thread_t *p_vout )
{
    vout_sys_t *p_sys = p_vout->p_sys;

    if( p_sys->p_vout->pf_lock &&
        p_sys->p_vout->pf_lock( p_sys->p_vout ) )
    {
        msg_Warn( p_vout, "could not lock OpenGL provider" );
        return;
    }

    glFinish();
    glFlush();

    if( p_sys->p_vout->pf_unlock )
    {
        p_sys->p_vout->pf_unlock( p_sys->p_vout );
    }
}

/*****************************************************************************
 * Destroy: destroy GLX video thread output method
 *****************************************************************************
 * Terminate an output method created by CreateVout
 *****************************************************************************/
static void DestroyVout( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;
    vout_sys_t *p_sys = p_vout->p_sys;

    module_Unneed( p_sys->p_vout, p_sys->p_vout->p_module );
    vlc_object_detach( p_sys->p_vout );
    vlc_object_destroy( p_sys->p_vout );

    /* Free the texture buffer*/
    if( p_sys->pp_buffer[0] ) free( p_sys->pp_buffer[0] );
    if( p_sys->pp_buffer[1] ) free( p_sys->pp_buffer[1] );

    free( p_sys );
}

/*****************************************************************************
 * Manage: handle Sys events
 *****************************************************************************
 * This function should be called regularly by video output thread. It returns
 * a non null value if an error occurred.
 *****************************************************************************/
static int Manage( vout_thread_t *p_vout )
{
    vout_sys_t *p_sys = p_vout->p_sys;
    int i_ret, i_fullscreen_change;

    i_fullscreen_change = ( p_vout->i_changes & VOUT_FULLSCREEN_CHANGE );

    p_sys->p_vout->i_changes = p_vout->i_changes;
    i_ret = p_sys->p_vout->pf_manage( p_sys->p_vout );
    p_vout->i_changes = p_sys->p_vout->i_changes;

#ifdef SYS_DARWIN
    if( p_sys->p_vout->pf_lock &&
        p_sys->p_vout->pf_lock( p_sys->p_vout ) )
    {
        msg_Warn( p_vout, "could not lock OpenGL provider" );
        return i_ret;
    }

    /* On OS X, we create the window and the GL view when entering
       fullscreen - the textures have to be inited again */
    if( i_fullscreen_change )
    {
        InitTextures( p_vout );

        switch( p_sys->i_effect )
        {
            case OPENGL_EFFECT_CUBE:
                glEnable( GL_CULL_FACE );
                break;

            case OPENGL_EFFECT_TRANSPARENT_CUBE:
                glDisable( GL_DEPTH_TEST );
                glEnable( GL_BLEND );
                glBlendFunc( GL_SRC_ALPHA, GL_ONE );
                break;
        }

        if( p_sys->i_effect & ( OPENGL_EFFECT_CUBE |
                    OPENGL_EFFECT_TRANSPARENT_CUBE ) )
        {
            /* Set the perpective */
            glMatrixMode( GL_PROJECTION );
            glLoadIdentity();
            glFrustum( -1.0, 1.0, -1.0, 1.0, 3.0, 20.0 );
            glMatrixMode( GL_MODELVIEW );
            glLoadIdentity();
            glTranslatef( 0.0, 0.0, - 5.0 );
        }
    }

    if( p_sys->p_vout->pf_unlock )
    {
        p_sys->p_vout->pf_unlock( p_sys->p_vout );
    }
#endif

    return i_ret;
}

/*****************************************************************************
 * Render: render previously calculated output
 *****************************************************************************/
static void Render( vout_thread_t *p_vout, picture_t *p_pic )
{
    vout_sys_t *p_sys = p_vout->p_sys;

    /* On Win32/GLX, we do this the usual way:
       + Fill the buffer with new content,
       + Reload the texture,
       + Use the texture.

       On OS X with VRAM or AGP texturing, the order has to be:
       + Reload the texture,
       + Fill the buffer with new content,
       + Use the texture.

       (Thanks to gcc from the Arstechnica forums for the tip)

       Therefore, we have to use two buffers and textures. On Win32/GLX,
       we reload the texture to be displayed and use it right away. On
       OS X, we first render, then reload the texture to be used next
       time. */

    if( p_sys->p_vout->pf_lock &&
        p_sys->p_vout->pf_lock( p_sys->p_vout ) )
    {
        msg_Warn( p_vout, "could not lock OpenGL provider" );
        return;
    }

#ifdef SYS_DARWIN
    int i_new_index;
    i_new_index = ( p_sys->i_index + 1 ) & 1;


    /* Update the texture */
    glBindTexture( VLCGL_TARGET, p_sys->p_textures[i_new_index] );
    glTexSubImage2D( VLCGL_TARGET, 0, 0, 0, p_sys->i_tex_width,
                     p_sys->i_tex_height, VLCGL_FORMAT, VLCGL_TYPE,
                     p_sys->pp_buffer[i_new_index] );

    /* Bind to the previous texture for drawing */
    glBindTexture( VLCGL_TARGET, p_sys->p_textures[p_sys->i_index] );

    /* Switch buffers */
    p_sys->i_index = i_new_index;
    p_pic->p->p_pixels = p_sys->pp_buffer[p_sys->i_index];

#else
    /* Update the texture */
    glTexSubImage2D( GL_TEXTURE_2D, 0, 0, 0,
                     p_vout->render.i_width, p_vout->render.i_height,
                     VLCGL_RGB_FORMAT, VLCGL_RGB_TYPE, p_sys->pp_buffer[0] );
#endif

    if( p_sys->p_vout->pf_unlock )
    {
        p_sys->p_vout->pf_unlock( p_sys->p_vout );
    }
}

/*****************************************************************************
 * DisplayVideo: displays previously rendered output
 *****************************************************************************/
static void DisplayVideo( vout_thread_t *p_vout, picture_t *p_pic )
{
    vout_sys_t *p_sys = p_vout->p_sys;
    float f_width, f_height;

    if( p_sys->p_vout->pf_lock &&
        p_sys->p_vout->pf_lock( p_sys->p_vout ) )
    {
        msg_Warn( p_vout, "could not lock OpenGL provider" );
        return;
    }

    /* glTexCoord works differently with GL_TEXTURE_2D and
       GL_TEXTURE_RECTANGLE_EXT */
#ifdef SYS_DARWIN
    f_width = (float)p_vout->output.i_width;
    f_height = (float)p_vout->output.i_height;
#else
    f_width = (float)p_vout->output.i_width / p_sys->i_tex_width;
    f_height = (float)p_vout->output.i_height / p_sys->i_tex_height;
#endif

    /* Why drawing here and not in Render()? Because this way, the
       OpenGL providers can call pf_display to force redraw. Currently,
       the OS X provider uses it to get a smooth window resizing */

    glClear( GL_COLOR_BUFFER_BIT );

    if( p_sys->i_effect == OPENGL_EFFECT_NONE )
    {
        glEnable( VLCGL_TARGET );
        glBegin( GL_POLYGON );
        glTexCoord2f( 0.5, 0.5 ); glVertex2f( -1.0, 1.0 );
        glTexCoord2f( f_width - 0.5, 0.5 ); glVertex2f( 1.0, 1.0 );
        glTexCoord2f( f_width - 0.5, f_height - 0.5 ); glVertex2f( 1.0, -1.0 );
        glTexCoord2f( 0.5, f_height - 0.5 ); glVertex2f( -1.0, -1.0 );
        glEnd();
    }
    else
    {
        glRotatef( 0.5 * p_sys->f_speed , 0.3, 0.5, 0.7 );

        glEnable( VLCGL_TARGET );
        glBegin( GL_QUADS );

        /* Front */
        glTexCoord2f( 0.5, 0.5 ); glVertex3f( - 1.0, 1.0, 1.0 );
        glTexCoord2f( 0.5, f_height - 0.5 ); glVertex3f( - 1.0, - 1.0, 1.0 );
        glTexCoord2f( f_width - 0.5, f_height - 0.5 ); glVertex3f( 1.0, - 1.0, 1.0 );
        glTexCoord2f( f_width - 0.5, 0.5 ); glVertex3f( 1.0, 1.0, 1.0 );

        /* Left */
        glTexCoord2f( 0.5, 0.5 ); glVertex3f( - 1.0, 1.0, - 1.0 );
        glTexCoord2f( 0.5, f_height - 0.5 ); glVertex3f( - 1.0, - 1.0, - 1.0 );
        glTexCoord2f( f_width - 0.5, f_height - 0.5 ); glVertex3f( - 1.0, - 1.0, 1.0 );
        glTexCoord2f( f_width - 0.5, 0.5 ); glVertex3f( - 1.0, 1.0, 1.0 );

        /* Back */
        glTexCoord2f( 0.5, 0.5 ); glVertex3f( 1.0, 1.0, - 1.0 );
        glTexCoord2f( 0.5, f_height - 0.5 ); glVertex3f( 1.0, - 1.0, - 1.0 );
        glTexCoord2f( f_width - 0.5, f_height - 0.5 ); glVertex3f( - 1.0, - 1.0, - 1.0 );
        glTexCoord2f( f_width - 0.5, 0.5 ); glVertex3f( - 1.0, 1.0, - 1.0 );

        /* Right */
        glTexCoord2f( 0.5, 0.5 ); glVertex3f( 1.0, 1.0, 1.0 );
        glTexCoord2f( 0.5, f_height - 0.5 ); glVertex3f( 1.0, - 1.0, 1.0 );
        glTexCoord2f( f_width - 0.5, f_height - 0.5 ); glVertex3f( 1.0, - 1.0, - 1.0 );
        glTexCoord2f( f_width - 0.5, 0.5 ); glVertex3f( 1.0, 1.0, - 1.0 );

        /* Top */
        glTexCoord2f( 0.5, 0.5 ); glVertex3f( - 1.0, 1.0, - 1.0 );
        glTexCoord2f( 0.5, f_height - 0.5 ); glVertex3f( - 1.0, 1.0, 1.0 );
        glTexCoord2f( f_width - 0.5, f_height - 0.5 ); glVertex3f( 1.0, 1.0, 1.0 );
        glTexCoord2f( 0.5, f_height - 0.5 ); glVertex3f( - 1.0, - 1.0, - 1.0 );
        glTexCoord2f( f_width - 0.5, f_height - 0.5 ); glVertex3f( 1.0, - 1.0, - 1.0 );
        glTexCoord2f( f_width - 0.5, 0.5 ); glVertex3f( 1.0, - 1.0, 1.0 );
        glEnd();
    }

    glDisable( VLCGL_TARGET );

    p_sys->p_vout->pf_swap( p_sys->p_vout );

    if( p_sys->p_vout->pf_unlock )
    {
        p_sys->p_vout->pf_unlock( p_sys->p_vout );
    }
}

int GetAlignedSize( int i_size )
{
    /* Return the nearest power of 2 */
    int i_result = 1;
    while( i_result < i_size )
    {
        i_result *= 2;
    }
    return i_result;
}

/*****************************************************************************
 * Control: control facility for the vout
 *****************************************************************************/
static int Control( vout_thread_t *p_vout, int i_query, va_list args )
{
    vout_sys_t *p_sys = p_vout->p_sys;

    switch( i_query )
    {
    case VOUT_SNAPSHOT:
        return vout_vaControlDefault( p_vout, i_query, args );

    default:
        if( p_sys->p_vout->pf_control )
            return p_sys->p_vout->pf_control( p_sys->p_vout, i_query, args );
        else
            return vout_vaControlDefault( p_vout, i_query, args );
    }
}

static int InitTextures( vout_thread_t *p_vout )
{
    vout_sys_t *p_sys = p_vout->p_sys;
    int i_index;

    glDeleteTextures( 2, p_sys->p_textures );
    glGenTextures( 2, p_sys->p_textures );

    for( i_index = 0; i_index < 2; i_index++ )
    {
        glBindTexture( VLCGL_TARGET, p_sys->p_textures[i_index] );
    
        /* Set the texture parameters */
        glTexParameterf( VLCGL_TARGET, GL_TEXTURE_PRIORITY, 1.0 );
    
        glTexParameteri( VLCGL_TARGET, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
        glTexParameteri( VLCGL_TARGET, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
        
        glTexParameteri( VLCGL_TARGET, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
        glTexParameteri( VLCGL_TARGET, GL_TEXTURE_MIN_FILTER, GL_LINEAR );

        glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );

#ifdef SYS_DARWIN
        /* Tell the driver not to make a copy of the texture but to use
           our buffer */
        glEnable( GL_UNPACK_CLIENT_STORAGE_APPLE );
        glPixelStorei( GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE );
    
#if 0
        /* Use VRAM texturing */
        glTexParameteri( VLCGL_TARGET, GL_TEXTURE_STORAGE_HINT_APPLE,
                         GL_STORAGE_CACHED_APPLE );
#else
        /* Use AGP texturing */
        glTexParameteri( VLCGL_TARGET, GL_TEXTURE_STORAGE_HINT_APPLE,
                         GL_STORAGE_SHARED_APPLE );
#endif
#endif

        /* Call glTexImage2D only once, and use glTexSubImage2D later */
        glTexImage2D( VLCGL_TARGET, 0, 3, p_sys->i_tex_width,
                      p_sys->i_tex_height, 0, VLCGL_FORMAT, VLCGL_TYPE,
                      p_sys->pp_buffer[i_index] );
    }

    return 0;
}

/*****************************************************************************
 * SendEvents: forward mouse and keyboard events to the parent p_vout
 *****************************************************************************/
static int SendEvents( vlc_object_t *p_this, char const *psz_var,
                       vlc_value_t oldval, vlc_value_t newval, void *_p_vout )
{
    return var_Set( (vlc_object_t *)_p_vout, psz_var, newval );
}