1 #ifndef DALI_INTERNAL_SCENE_GRAPH_LAYER_H
2 #define DALI_INTERNAL_SCENE_GRAPH_LAYER_H
5 * Copyright (c) 2018 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
22 #include <dali/public-api/actors/layer.h>
23 #include <dali/internal/event/common/event-thread-services.h>
24 #include <dali/internal/update/nodes/node.h>
32 // value types used by messages
33 template <> struct ParameterType< Dali::Layer::SortFunctionType >
34 : public BasicType< Dali::Layer::SortFunctionType > {};
35 template <> struct ParameterType< Dali::Layer::Behavior >
36 : public BasicType< Dali::Layer::Behavior > {};
43 * Pair of node-renderer
52 Renderable( Node* node, Renderer* renderer )
61 typedef Dali::Vector< Renderable > RenderableContainer;
64 * Layers have a "depth" relative to all other layers in the scene-graph.
65 * Non-layer child nodes are considered part of the layer.
67 * Layers are rendered separately, and by default the depth buffer is cleared before each layer is rendered.
68 * Objects in higher layers, are rendered after (in front of) objects in lower layers.
70 class Layer : public Node
74 typedef Dali::Layer::SortFunctionType SortFunctionType;
79 * Construct a new Layer.
80 * @param[in] id The Unique ID of the actor creating the node
81 * @return A smart-pointer to a newly allocated Node
83 static SceneGraph::Layer* New( unsigned int id );
86 * From Node, to convert a node to a layer.
89 virtual Layer* GetLayer()
95 * Sets the sort-function of a layer.
96 * @param [in] function The new sort-function.
98 void SetSortFunction( Dali::Layer::SortFunctionType function );
101 * Retrieve the function used to sort semi-transparent geometry in this layer.
102 * @return The sort function.
104 Dali::Layer::SortFunctionType GetSortFunction() const
106 return mSortFunction;
110 * Sets whether clipping is enabled for a layer.
111 * @param [in] enabled True if clipping is enabled.
113 void SetClipping( bool enabled );
116 * Query whether clipping is enabled for a layer.
117 * @return True if clipping is enabled.
119 bool IsClipping() const
125 * Sets the clipping box of a layer, in window coordinates.
126 * The contents of the layer will not be visible outside this box, when clipping is
127 * enabled. The default clipping box is empty (0,0,0,0).
128 * @param [in] box The clipping box
130 void SetClippingBox( const ClippingBox& box );
133 * Retrieves the clipping box of a layer, in window coordinates.
134 * @return The clipping box
136 const ClippingBox& GetClippingBox() const
142 * Sets the behavior of the layer
143 * @param [in] behavior The behavior of the layer
145 void SetBehavior( Dali::Layer::Behavior behavior );
148 * Retrieves the behavior of the layer.
149 * @return The behavior
151 Dali::Layer::Behavior GetBehavior() const
157 * @copydoc Dali::Layer::SetDepthTestDisabled()
159 void SetDepthTestDisabled( bool disable );
162 * @copydoc Dali::Layer::IsDepthTestDisabled()
164 bool IsDepthTestDisabled() const;
167 * Enables the reuse of the model view matrices of all renderers for this layer
168 * @param[in] updateBufferIndex The current update buffer index.
169 * @param value to set
171 void SetReuseRenderers( BufferIndex updateBufferIndex, bool value )
173 mAllChildTransformsClean[ updateBufferIndex ] = value;
177 * Checks if it is ok to reuse renderers. Renderers can be reused if ModelView transform for all the renderers
178 * has not changed from previous use.
179 * @param[in] camera A pointer to the camera that we want to use to render the list.
180 * @return True if all children transforms have been clean for two consecutive frames and the camera we are going
181 * to use is the same than the one used before ( Otherwise View transform will be different )
184 bool CanReuseRenderers( Camera* camera )
186 bool bReturn( mAllChildTransformsClean[ 0 ] && mAllChildTransformsClean[ 1 ] && camera == mLastCamera );
187 mLastCamera = camera;
193 * @return True if default sort function is used
195 bool UsesDefaultSortFunction()
197 return mIsDefaultSortFunction;
201 * Clears all the renderable lists
203 void ClearRenderables();
208 * Private constructor.
209 * @param[in] id The Unique ID of the actor creating the node
210 * See also Layer::New()
212 Layer( unsigned int id );
223 Layer& operator=(const Layer& rhs);
225 public: // For update-algorithms
227 RenderableContainer colorRenderables;
228 RenderableContainer overlayRenderables;
232 SortFunctionType mSortFunction; ///< Used to sort semi-transparent geometry
234 ClippingBox mClippingBox; ///< The clipping box, in window coordinates
235 Camera* mLastCamera; ///< Pointer to the last camera that has rendered the layer
237 Dali::Layer::Behavior mBehavior; ///< The behavior of the layer
239 bool mAllChildTransformsClean[ 2 ]; ///< True if all child nodes transforms are clean,
240 /// double buffered as we need two clean frames before we can reuse N-1 for N+1
241 /// this allows us to cache render items when layer is "static"
242 bool mIsClipping:1; ///< True when clipping is enabled
243 bool mDepthTestDisabled:1; ///< Whether depth test is disabled.
244 bool mIsDefaultSortFunction:1; ///< whether the default depth sort function is used
248 // Messages for Layer
251 * Create a message to set the sort-function of a layer
252 * @param[in] layer The layer
253 * @param[in] function The new sort-function.
255 inline void SetSortFunctionMessage( EventThreadServices& eventThreadServices, const Layer& layer, Dali::Layer::SortFunctionType function )
257 typedef MessageValue1< Layer, Dali::Layer::SortFunctionType > LocalType;
259 // Reserve some memory inside the message queue
260 unsigned int* slot = eventThreadServices.ReserveMessageSlot( sizeof( LocalType ) );
262 // Construct message in the message queue memory; note that delete should not be called on the return value
263 new (slot) LocalType( &layer, &Layer::SetSortFunction, function );
267 * Create a message for enabling/disabling layer clipping
268 * @param[in] layer The layer
269 * @param[in] enabled True if clipping is enabled
271 inline void SetClippingMessage( EventThreadServices& eventThreadServices, const Layer& layer, bool enabled )
273 typedef MessageValue1< Layer, bool > LocalType;
275 // Reserve some memory inside the message queue
276 unsigned int* slot = eventThreadServices.ReserveMessageSlot( sizeof( LocalType ) );
278 // Construct message in the message queue memory; note that delete should not be called on the return value
279 new (slot) LocalType( &layer, &Layer::SetClipping, enabled );
283 * Create a message to set the clipping box of a layer
284 * @param[in] layer The layer
285 * @param[in] clippingbox The clipping box
287 inline void SetClippingBoxMessage( EventThreadServices& eventThreadServices, const Layer& layer, const Dali::ClippingBox& clippingbox )
289 typedef MessageValue1< Layer, Dali::ClippingBox > LocalType;
291 // Reserve some memory inside the message queue
292 unsigned int* slot = eventThreadServices.ReserveMessageSlot( sizeof( LocalType ) );
294 // Construct message in the message queue memory; note that delete should not be called on the return value
295 new (slot) LocalType( &layer, &Layer::SetClippingBox, clippingbox );
299 * Create a message to set the behavior of a layer
300 * @param[in] layer The layer
301 * @param[in] behavior The behavior
303 inline void SetBehaviorMessage( EventThreadServices& eventThreadServices,
305 Dali::Layer::Behavior behavior )
307 typedef MessageValue1< Layer, Dali::Layer::Behavior > LocalType;
309 // Reserve some memory inside the message queue
310 unsigned int* slot = eventThreadServices.ReserveMessageSlot( sizeof( LocalType ) );
312 // Construct message in the message queue memory; note that delete should not be called on the return value
313 new (slot) LocalType( &layer, &Layer::SetBehavior, behavior );
317 * Create a message for disabling/enabling depth test.
319 * @see Dali::Layer::SetDepthTestDisabled().
321 * @param[in] layer The layer
322 * @param[in] disable \e true disables depth test. \e false sets the default behavior.
324 inline void SetDepthTestDisabledMessage( EventThreadServices& eventThreadServices, const Layer& layer, bool disable )
326 typedef MessageValue1< Layer, bool > LocalType;
328 // Reserve some memory inside the message queue
329 unsigned int* slot = eventThreadServices.ReserveMessageSlot( sizeof( LocalType ) );
331 // Construct message in the message queue memory; note that delete should not be called on the return value
332 new (slot) LocalType( &layer, &Layer::SetDepthTestDisabled, disable );
335 } // namespace SceneGraph
337 // Template specialisation for OwnerPointer<Layer>, because delete is protected
339 void OwnerPointer<Dali::Internal::SceneGraph::Layer>::Reset();
341 } // namespace Internal
345 #endif // DALI_INTERNAL_SCENE_GRAPH_LAYER_H