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ephysics: support disabling stacking based on Z axis 

Since now we support movement on Z axis the evas objects
associated to bodies need to be re-stacked to be below / above
each other.

But if Z axis movement is disabled, no cloth is used, ...,
it can be safely disabled, since evas objects won't overlap.
And it will save performance.



SVN revision: 78491
This commit is contained in:
Bruno Dilly 2012-10-25 21:55:23 +00:00
parent 651b562ebd
commit 829065f97a
2 changed files with 72 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
legacy/ephysics/src/lib/EPhysics.h
View File

@ -1523,6 +1523,50 @@ EAPI void ephysics_world_light_all_bodies_set(EPhysics_World *world, Eina_Bool e
*/
EAPI Eina_Bool ephysics_world_light_all_bodies_get(const EPhysics_World *world);
/**
* @brief
* Enable / disable stacking based on bodies z coordinates.
*
* Evas objects associated to bodies will be restacked when it's enabled.
* So if a body A has coordinates x = 10, y = 10, z = 8 and a body B
* has coordinates x = 10, y = 10, z = 10, the evas object associated to B
* will be displayed below the evas object associated to A.
*
* Evas objects will be restacked at each simulation tick. It's enabled by
* default, and disabling it can lead to wrong scenarios when movement
* on Z axis is enabled or when cloths are used.
*
* But disabling it can save performance, so if you won't face these
* scenarios, it safe to disable it, since no evas object will be moved to
* be below or above others.
*
* @param world The physics world.
* @param enabled If @c EINA_TRUE, stacking based on Z coordinates will be
* enabled, otherwise it will be disabled.
*
* @see ephysics_world_stack_enable_get()
* @see ephysics_body_evas_object_set()
*
* @ingroup EPhysics_World
*/
EAPI void ephysics_world_stack_enable_set(EPhysics_World *world, Eina_Bool enabled);
/**
* @brief
* Get stacking status of world.
*
* Stacking based on bodies z coordinates can be enabled or disabled.
*
* @param world The physics world.
* @return @c EINA_TRUE if it's running, or @c EINA_FALSE if it's paused or on
* error.
*
* @see ephysics_world_stack_enable_set() for more details.
*
* @ingroup EPhysics_World
*/
EAPI Eina_Bool ephysics_world_stack_enable_get(const EPhysics_World *world);
/**
* @}
*/

30
legacy/ephysics/src/lib/ephysics_world.cpp
View File

@ -101,6 +101,7 @@ struct _EPhysics_World {
Eina_Bool outside_front:1;
Eina_Bool outside_back:1;
Eina_Bool pending_simulation:1;
Eina_Bool stacking:1;
};
static int _ephysics_world_init_count = 0;
@ -242,7 +243,8 @@ _ephysics_world_tick(btDynamicsWorld *dynamics_world)
}
}
ephysics_body_evas_objects_restack(world);
if (world->stacking)
ephysics_body_evas_objects_restack(world);
if (camera_moved)
{
@ -752,8 +754,9 @@ ephysics_world_new(void)
INF("Couldn't initialize the collision filter.");
else
world->dynamics_world->getPairCache()->setOverlapFilterCallback(
world->filter_cb);
world->filter_cb);
world->stacking = EINA_TRUE;
world->rate = 30;
world->max_sub_steps = 3;
world->fixed_time_step = 1/60.f;
@ -1627,6 +1630,29 @@ ephysics_world_light_all_bodies_get(const EPhysics_World *world)
return world->light->all_bodies;
}
EAPI void
ephysics_world_stack_enable_set(EPhysics_World *world, Eina_Bool enabled)
{
if (!world)
{
ERR("Can't enable / disable stacking, world wasn't provided.");
return;
}
world->stacking = !!enabled;
}
EAPI Eina_Bool
ephysics_world_stack_enable_get(const EPhysics_World *world)
{
if (!world)
{
ERR("No world, no stacking status for you.");
return EINA_FALSE;
}
return world->stacking;
}
#ifdef __cplusplus
}
#endif