opengl.c

uclinux 下的vlc播放器源代码

#       endif
    i_pixel_pitch = 2;
#   endif
#else
    p_vout->output.i_chroma = VLC_FOURCC('R','V','3','2');
#       if defined( WORDS_BIGENDIAN )
    p_vout->output.i_rmask = 0xff000000;
    p_vout->output.i_gmask = 0x00ff0000;
    p_vout->output.i_bmask = 0x0000ff00;
#       else
    p_vout->output.i_rmask = 0x000000ff;
    p_vout->output.i_gmask = 0x0000ff00;
    p_vout->output.i_bmask = 0x00ff0000;
#       endif
    i_pixel_pitch = 4;
#endif

    /* Since OpenGL can do rescaling for us, stick to the default
     * coordinates and aspect. */
    p_vout->output.i_width  = p_vout->render.i_width;
    p_vout->output.i_height = p_vout->render.i_height;
    p_vout->output.i_aspect = p_vout->render.i_aspect;

    p_vout->fmt_out = p_vout->fmt_in;
    p_vout->fmt_out.i_chroma = p_vout->output.i_chroma;

    /* We know the chroma, allocate one buffer which will be used
     * directly by the decoder */
    p_sys->pp_buffer[0] =
        malloc( p_sys->i_tex_width * p_sys->i_tex_height * i_pixel_pitch );
    if( !p_sys->pp_buffer[0] )
    {
        msg_Err( p_vout, "out of memory" );
        return -1;
    }
    p_sys->pp_buffer[1] =
        malloc( p_sys->i_tex_width * p_sys->i_tex_height * i_pixel_pitch );
    if( !p_sys->pp_buffer[1] )
    {
        msg_Err( p_vout, "out of memory" );
        return -1;
    }

    p_vout->p_picture[0].i_planes = 1;
    p_vout->p_picture[0].p->p_pixels = p_sys->pp_buffer[0];
    p_vout->p_picture[0].p->i_lines = p_vout->output.i_height;
    p_vout->p_picture[0].p->i_visible_lines = p_vout->output.i_height;
    p_vout->p_picture[0].p->i_pixel_pitch = i_pixel_pitch;
    p_vout->p_picture[0].p->i_pitch = p_vout->output.i_width *
        p_vout->p_picture[0].p->i_pixel_pitch;
    p_vout->p_picture[0].p->i_visible_pitch = p_vout->output.i_width *
        p_vout->p_picture[0].p->i_pixel_pitch;

    p_vout->p_picture[0].i_status = DESTROYED_PICTURE;
    p_vout->p_picture[0].i_type   = DIRECT_PICTURE;

    PP_OUTPUTPICTURE[ 0 ] = &p_vout->p_picture[0];

    I_OUTPUTPICTURES = 1;

    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 0;
    }

    InitTextures( p_vout );

    glDisable(GL_BLEND);
    glDisable(GL_DEPTH_TEST);
    glDepthMask(GL_FALSE);
    glDisable(GL_CULL_FACE);
    glClearColor( 0.0f, 0.0f, 0.0f, 1.0f );
    glClear( GL_COLOR_BUFFER_BIT );

    /* Check if the user asked for useless visual effects */
    var_Get( p_vout, "opengl-effect", &val );
    if( !val.psz_string || !strcmp( val.psz_string, "none" ))
    {
        p_sys->i_effect = OPENGL_EFFECT_NONE;
    }
    else if( !strcmp( val.psz_string, "cube" ) )
    {
        p_sys->i_effect = OPENGL_EFFECT_CUBE;

        glEnable( GL_CULL_FACE);
    }
    else if( !strcmp( val.psz_string, "transparent-cube" ) )
    {
        p_sys->i_effect = OPENGL_EFFECT_TRANSPARENT_CUBE;

        glDisable( GL_DEPTH_TEST );
        glEnable( GL_BLEND );
        glBlendFunc( GL_SRC_ALPHA, GL_ONE );
    }
    else
    {
#ifdef OPENGL_MORE_EFFECT
		p_sys->i_effect = 3;
        while (( strcmp( val.psz_string, ppsz_effects[p_sys->i_effect]) ) && (pow(2,p_sys->i_effect) < INIFILE))
        {
            p_sys->i_effect ++;
        }
		if (pow(2,p_sys->i_effect) < INIFILE) 
			p_sys->i_effect = pow(2,p_sys->i_effect);
		else if ( strcmp( val.psz_string, ppsz_effects[p_sys->i_effect]))
		{
			msg_Warn( p_vout, "no valid opengl effect provided, using "
					  "\"none\"" );
			p_sys->i_effect = OPENGL_EFFECT_NONE;
		}
#else
        msg_Warn( p_vout, "no valid opengl effect provided, using "
                  "\"none\"" );
        p_sys->i_effect = OPENGL_EFFECT_NONE;
#endif
    }
    if( val.psz_string ) free( val.psz_string );

    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 );
    }
#ifdef OPENGL_MORE_EFFECT
	else 
    {
        /* 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, -3.0 );

		float f_pov_x, f_pov_y, f_pov_z;
		f_pov_x = var_CreateGetFloat( p_vout, "opengl-pov-x");
		f_pov_y = var_CreateGetFloat( p_vout, "opengl-pov-y");
		f_pov_z = var_CreateGetFloat( p_vout, "opengl-pov-z");
		gluLookAt(0, 0, 0, f_pov_x, f_pov_y, f_pov_z, 0, 1, 0);
    }
#endif
    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();

    /* Free the texture buffer*/
    glDeleteTextures( 2, p_sys->p_textures );
    if( p_sys->pp_buffer[0] ) free( p_sys->pp_buffer[0] );
    if( p_sys->pp_buffer[1] ) free( p_sys->pp_buffer[1] );

    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( 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_vout->fmt_out.i_x_offset = p_sys->p_vout->fmt_in.i_x_offset =
        p_vout->fmt_in.i_x_offset;
    p_vout->fmt_out.i_y_offset = p_sys->p_vout->fmt_in.i_y_offset =
        p_vout->fmt_in.i_y_offset;
    p_vout->fmt_out.i_visible_width = p_sys->p_vout->fmt_in.i_visible_width =
        p_vout->fmt_in.i_visible_width;
    p_vout->fmt_out.i_visible_height = p_sys->p_vout->fmt_in.i_visible_height =
        p_vout->fmt_in.i_visible_height;
    p_vout->fmt_out.i_aspect = p_sys->p_vout->fmt_in.i_aspect =
        p_vout->fmt_in.i_aspect;
    p_vout->fmt_out.i_sar_num = p_sys->p_vout->fmt_in.i_sar_num =
        p_vout->fmt_in.i_sar_num;
    p_vout->fmt_out.i_sar_den = p_sys->p_vout->fmt_in.i_sar_den =
        p_vout->fmt_in.i_sar_den;
    p_vout->output.i_aspect = p_vout->fmt_in.i_aspect;

    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 __APPLE__
    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:
#ifdef OPENGL_MORE_EFFECT
			case CYLINDER:
			case TORUS:
			case SPHERE:
			case SQUAREXY:
			case SQUARER:
			case ASINXY:
			case ASINR:
			case SINEXY:
			case SINER:
#endif            
                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 );
        }
#ifdef OPENGL_MORE_EFFECT
		else 
	    {
	        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, -3.0 );
	
			float f_pov_x, f_pov_y, f_pov_z;
			f_pov_x = var_CreateGetFloat( p_vout, "opengl-pov-x");
			f_pov_y = var_CreateGetFloat( p_vout, "opengl-pov-y");
			f_pov_z = var_CreateGetFloat( p_vout, "opengl-pov-z");
			gluLookAt(0, 0, 0, f_pov_x, f_pov_y, f_pov_z, 0, 1, 0);
	    }
#endif        
    }

    if( p_sys->p_vout->pf_unlock )
    {
        p_sys->p_vout->pf_unlock( p_sys->p_vout );
    }
#endif
// to align in real time in OPENGL
	if (p_sys->p_vout->i_alignment != p_vout->i_alignment)
	{
		p_vout->i_changes = VOUT_CROP_CHANGE;		//to force change
    	p_sys->p_vout->i_alignment = p_vout->i_alignment;	
	}
	
    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 __APPLE__
    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_vout->fmt_out.i_width,
                     p_vout->fmt_out.i_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];