7d25cbe87f
This commit introduces a few important changes in order to acommodate graphene_ray_t. Most of them are positive changes, so don't panic :) The first very visible change is that neither the actor box nor the clip rectangles are projected before being pushed. This required changing the parameters of the related functions at both ClutterPickContext, and ClutterPickStack, to receive boxes instead of vertices. These rectangles are projected on demand now, so in the best case (first actor picked) only one projection happens; and in the worst case, it projects as much as it does now. The second important change is that there are no more checks for axis-alignment anymore. That's because picking now happens in 3D space, using triangles. Talking about triangles in 3D space, this is what is used now for picking. We break down each actor rectangle in 2 triangles, and check if the projected pick point is inside any one of them, of if the ray intersects any one of them. The same check happens for the clip rectangles. Checking the projected pick point is both an optimization for the 2D case, and a workaround to graphene_ray_t problems with float precision, which is specially visible on edges such as the top bar. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1509
67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
/*
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* Copyright (C) 2020 Endless OS Foundation, LLC
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef CLUTTER_PICK_STACK_PRIVATE_H
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#define CLUTTER_PICK_STACK_PRIVATE_H
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#include <glib-object.h>
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#include "clutter-macros.h"
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#include "clutter-stage-view.h"
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G_BEGIN_DECLS
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#define CLUTTER_TYPE_PICK_STACK (clutter_pick_stack_get_type ())
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typedef struct _ClutterPickStack ClutterPickStack;
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GType clutter_pick_stack_get_type (void) G_GNUC_CONST;
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ClutterPickStack * clutter_pick_stack_new (CoglContext *context);
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ClutterPickStack * clutter_pick_stack_ref (ClutterPickStack *pick_stack);
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void clutter_pick_stack_unref (ClutterPickStack *pick_stack);
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void clutter_pick_stack_seal (ClutterPickStack *pick_stack);
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void clutter_pick_stack_log_pick (ClutterPickStack *pick_stack,
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const ClutterActorBox *box,
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ClutterActor *actor);
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void clutter_pick_stack_push_clip (ClutterPickStack *pick_stack,
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const ClutterActorBox *box);
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void clutter_pick_stack_pop_clip (ClutterPickStack *pick_stack);
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void clutter_pick_stack_push_transform (ClutterPickStack *pick_stack,
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const graphene_matrix_t *transform);
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void clutter_pick_stack_get_transform (ClutterPickStack *pick_stack,
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graphene_matrix_t *out_transform);
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void clutter_pick_stack_pop_transform (ClutterPickStack *pick_stack);
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ClutterActor *
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clutter_pick_stack_search_actor (ClutterPickStack *pick_stack,
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const graphene_point3d_t *point,
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const graphene_ray_t *ray);
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G_END_DECLS
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#endif /* CLUTTER_PICK_STACK_PRIVATE_H */
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