1 #ifndef DALI_INTERNAL_SCENE_GRAPH_LAYER_H
2 #define DALI_INTERNAL_SCENE_GRAPH_LAYER_H
5 * Copyright (c) 2022 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/internal/event/common/event-thread-services.h>
23 #include <dali/internal/update/nodes/node.h>
24 #include <dali/public-api/actors/layer.h>
30 // value types used by messages
32 struct ParameterType<Dali::Layer::SortFunctionType>
33 : public BasicType<Dali::Layer::SortFunctionType>
37 struct ParameterType<Dali::Layer::Behavior>
38 : public BasicType<Dali::Layer::Behavior>
47 * Pair of node-renderer
53 mRenderer(RendererKey::INVALID)
57 Renderable(Node* node, RendererKey renderer)
64 RendererKey mRenderer{RendererKey::INVALID};
67 } // namespace SceneGraph
68 } // Namespace Internal
70 /// Enable Renderable to be used as a trivial type in Dali::Vector.
72 struct TypeTraits<Internal::SceneGraph::Renderable> : public Dali::BasicTypes<Internal::SceneGraph::Renderable>
76 IS_TRIVIAL_TYPE = true
85 using RenderableContainer = Dali::Vector<Renderable>;
88 * Layers have a "depth" relative to all other layers in the scene-graph.
89 * Non-layer child nodes are considered part of the layer.
91 * Layers are rendered separately, and by default the depth buffer is cleared before each layer is rendered.
92 * Objects in higher layers, are rendered after (in front of) objects in lower layers.
94 class Layer : public Node
97 using SortFunctionType = Dali::Layer::SortFunctionType;
102 * Construct a new Layer.
103 * @return A smart-pointer to a newly allocated Node
105 static SceneGraph::Layer* New();
113 * From Node, to convert a node to a layer.
116 Layer* GetLayer() override
122 * Sets the sort-function of a layer.
123 * @param [in] function The new sort-function.
125 void SetSortFunction(Dali::Layer::SortFunctionType function);
128 * Retrieve the function used to sort semi-transparent geometry in this layer.
129 * @return The sort function.
131 Dali::Layer::SortFunctionType GetSortFunction() const
133 return mSortFunction;
137 * Sets whether clipping is enabled for a layer.
138 * @param [in] enabled True if clipping is enabled.
140 void SetClipping(bool enabled);
143 * Query whether clipping is enabled for a layer.
144 * @return True if clipping is enabled.
146 bool IsClipping() const
152 * Sets the clipping box of a layer, in window coordinates.
153 * The contents of the layer will not be visible outside this box, when clipping is
154 * enabled. The default clipping box is empty (0,0,0,0).
155 * @param [in] box The clipping box
157 void SetClippingBox(const ClippingBox& box);
160 * Retrieves the clipping box of a layer, in window coordinates.
161 * @return The clipping box
163 const ClippingBox& GetClippingBox() const
169 * Sets the behavior of the layer
170 * @param [in] behavior The behavior of the layer
172 void SetBehavior(Dali::Layer::Behavior behavior);
175 * Retrieves the behavior of the layer.
176 * @return The behavior
178 Dali::Layer::Behavior GetBehavior() const
184 * @copydoc Dali::Layer::SetDepthTestDisabled()
186 void SetDepthTestDisabled(bool disable);
189 * @copydoc Dali::Layer::IsDepthTestDisabled()
191 bool IsDepthTestDisabled() const;
194 * Enables the reuse of the model view matrices of all renderers for this layer
195 * @param[in] updateBufferIndex The current update buffer index.
196 * @param value to set
198 void SetReuseRenderers(BufferIndex updateBufferIndex, bool value)
200 mAllChildTransformsClean[updateBufferIndex] = value;
204 * Checks if it is ok to reuse renderers. Renderers can be reused if ModelView transform for all the renderers
205 * has not changed from previous use.
206 * @param[in] camera A pointer to the camera that we want to use to render the list.
207 * @return True if all children transforms have been clean for two consecutive frames and the camera we are going
208 * to use is the same than the one used before ( Otherwise View transform will be different )
211 bool CanReuseRenderers(const Camera* camera)
213 bool bReturn(mAllChildTransformsClean[0] && mAllChildTransformsClean[1] && camera == mLastCamera);
214 mLastCamera = camera;
220 * @return True if default sort function is used
222 bool UsesDefaultSortFunction()
224 return mIsDefaultSortFunction;
228 * Clears all the renderable lists
230 void ClearRenderables();
234 * Private constructor.
235 * See also Layer::New()
239 // Delete copy and move
240 Layer(const Layer&) = delete;
241 Layer(Layer&&) = delete;
242 Layer& operator=(const Layer& rhs) = delete;
243 Layer& operator=(Layer&& rhs) = delete;
245 public: // For update-algorithms
246 RenderableContainer colorRenderables;
247 RenderableContainer overlayRenderables;
250 SortFunctionType mSortFunction; ///< Used to sort semi-transparent geometry
252 ClippingBox mClippingBox; ///< The clipping box, in window coordinates
253 const Camera* mLastCamera; ///< Pointer to the last camera that has rendered the layer
255 Dali::Layer::Behavior mBehavior; ///< The behavior of the layer
257 bool mAllChildTransformsClean[2]; ///< True if all child nodes transforms are clean,
258 /// double buffered as we need two clean frames before we can reuse N-1 for N+1
259 /// this allows us to cache render items when layer is "static"
260 bool mIsClipping : 1; ///< True when clipping is enabled
261 bool mDepthTestDisabled : 1; ///< Whether depth test is disabled.
262 bool mIsDefaultSortFunction : 1; ///< whether the default depth sort function is used
265 // Messages for Layer
268 * Create a message to set the sort-function of a layer
269 * @param[in] layer The layer
270 * @param[in] function The new sort-function.
272 inline void SetSortFunctionMessage(EventThreadServices& eventThreadServices, const Layer& layer, Dali::Layer::SortFunctionType function)
274 using LocalType = MessageValue1<Layer, Dali::Layer::SortFunctionType>;
276 // Reserve some memory inside the message queue
277 uint32_t* slot = eventThreadServices.ReserveMessageSlot(sizeof(LocalType));
279 // Construct message in the message queue memory; note that delete should not be called on the return value
280 new(slot) LocalType(&layer, &Layer::SetSortFunction, function);
284 * Create a message for enabling/disabling layer clipping
285 * @param[in] layer The layer
286 * @param[in] enabled True if clipping is enabled
288 inline void SetClippingMessage(EventThreadServices& eventThreadServices, const Layer& layer, bool enabled)
290 using LocalType = MessageValue1<Layer, bool>;
292 // Reserve some memory inside the message queue
293 uint32_t* slot = eventThreadServices.ReserveMessageSlot(sizeof(LocalType));
295 // Construct message in the message queue memory; note that delete should not be called on the return value
296 new(slot) LocalType(&layer, &Layer::SetClipping, enabled);
300 * Create a message to set the clipping box of a layer
301 * @param[in] layer The layer
302 * @param[in] clippingbox The clipping box
304 inline void SetClippingBoxMessage(EventThreadServices& eventThreadServices, const Layer& layer, const Dali::ClippingBox& clippingbox)
306 using LocalType = MessageValue1<Layer, Dali::ClippingBox>;
308 // Reserve some memory inside the message queue
309 uint32_t* slot = eventThreadServices.ReserveMessageSlot(sizeof(LocalType));
311 // Construct message in the message queue memory; note that delete should not be called on the return value
312 new(slot) LocalType(&layer, &Layer::SetClippingBox, clippingbox);
316 * Create a message to set the behavior of a layer
317 * @param[in] layer The layer
318 * @param[in] behavior The behavior
320 inline void SetBehaviorMessage(EventThreadServices& eventThreadServices,
322 Dali::Layer::Behavior behavior)
324 using LocalType = MessageValue1<Layer, Dali::Layer::Behavior>;
326 // Reserve some memory inside the message queue
327 uint32_t* slot = eventThreadServices.ReserveMessageSlot(sizeof(LocalType));
329 // Construct message in the message queue memory; note that delete should not be called on the return value
330 new(slot) LocalType(&layer, &Layer::SetBehavior, behavior);
334 * Create a message for disabling/enabling depth test.
336 * @see Dali::Layer::SetDepthTestDisabled().
338 * @param[in] layer The layer
339 * @param[in] disable \e true disables depth test. \e false sets the default behavior.
341 inline void SetDepthTestDisabledMessage(EventThreadServices& eventThreadServices, const Layer& layer, bool disable)
343 using LocalType = MessageValue1<Layer, bool>;
345 // Reserve some memory inside the message queue
346 uint32_t* slot = eventThreadServices.ReserveMessageSlot(sizeof(LocalType));
348 // Construct message in the message queue memory; note that delete should not be called on the return value
349 new(slot) LocalType(&layer, &Layer::SetDepthTestDisabled, disable);
352 } // namespace SceneGraph
354 // Template specialisation for OwnerPointer<Layer>, because delete is protected
356 inline void OwnerPointer<Dali::Internal::SceneGraph::Layer>::Reset()
358 if(mObject != nullptr)
360 Dali::Internal::SceneGraph::Node::Delete(mObject);
364 } // namespace Internal
368 #endif // DALI_INTERNAL_SCENE_GRAPH_LAYER_H