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/* Iris - visualization plugin for XMMS
* Copyright (C) 2000-2002 Cdric DELFOSSE (cdelfosse@free.fr)
*
* 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 02111-1307, USA.
*/
/* Transitions on theme change
* TODO : transitions on song change
* new transitions are easy to add
*/
#include <stdlib.h>
#include "iris.h"
extern GLfloat y_angle;
extern GLfloat x_angle;
extern int max_transition_frames;
extern int transition_frames;
int transition = 0;
void
trans_zoom_out (gboolean init)
{
static GLfloat x, y, z;
//only init when starting transition
if (init)
{
x = 1.0;
y = 1.0;
z = 1.0;
return;
}
if (max_transition_frames / 2 < transition_frames)
{
x -= 1.0 / (max_transition_frames / 2);
y -= 1.0 / (max_transition_frames / 2);
z -= 1.0 / (max_transition_frames / 2);
}
else
{
x += 1.0 / (max_transition_frames / 2);
y += 1.0 / (max_transition_frames / 2);
z += 1.0 / (max_transition_frames / 2);
}
glScalef (x, y, z);
}
void
trans_zoom_in (gboolean init)
{
static GLfloat x, y, z;
//only init when starting transition
if (init)
{
x = 1.0;
y = 1.0;
z = 1.0;
return;
}
if (max_transition_frames / 2 < transition_frames)
{
x += 5.0 / (max_transition_frames / 2);
y += 5.0 / (max_transition_frames / 2);
z += 5.0 / (max_transition_frames / 2);
}
else
{
x -= 5.0 / (max_transition_frames / 2);
y -= 5.0 / (max_transition_frames / 2);
z -= 5.0 / (max_transition_frames / 2);
}
glScalef (x, y, z);
}
/* move up to top down look */
void
trans_vertical_view (gboolean init)
{
static GLfloat x_angle_tmp;
if (init)
{
x_angle_tmp = x_angle;
}
if (max_transition_frames / 2 < transition_frames)
{
x_angle += (90.0 - x_angle_tmp) / (max_transition_frames / 2);
}
else
{
x_angle -= (90.0 - x_angle_tmp) / (max_transition_frames / 2);
}
}
void
trans_spin_half_and_back (gboolean cc)
{
if (max_transition_frames / 2 < transition_frames)
{
if (cc)
y_angle -= 180.0 / (max_transition_frames / 2);
else
y_angle += 180.0 / (max_transition_frames / 2);
}
else
{
if (cc)
y_angle += 180.0 / (max_transition_frames / 2);
else
y_angle -= 180.0 / (max_transition_frames / 2);
}
}
void
trans_spin_full (gboolean cc)
{
if (cc)
y_angle -= 360.0 / max_transition_frames;
else
y_angle += 360.0 / max_transition_frames;
}
/* called on themeswitch */
void
init_theme_transition (void)
{
/* don't forget to update after adding new transitions */
transition = (int) ((gfloat) 6 * rand () / (RAND_MAX + 1.0));
/* init/reset transitions that need it */
trans_zoom_in (TRUE);
trans_zoom_out (TRUE);
trans_vertical_view (TRUE);
}
/* called every frame of a transition */
void
theme_transition ()
{
switch (transition)
{
case 0:
trans_zoom_out (FALSE);
break;
case 1:
trans_zoom_out (FALSE);
trans_spin_half_and_back ((int)
((gfloat) 1 * rand () / (RAND_MAX + 1.0)));
break;
case 2:
trans_zoom_in (FALSE);
break;
case 3:
trans_zoom_in (FALSE);
trans_spin_half_and_back ((int)
((gfloat) 1 * rand () / (RAND_MAX + 1.0)));
break;
case 4:
trans_vertical_view (FALSE);
trans_zoom_in (FALSE);
break;
case 5:
trans_vertical_view (FALSE);
trans_zoom_in (FALSE);
trans_spin_full ((int) ((gfloat) 1 * rand () / (RAND_MAX + 1.0)));
break;
}
}
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