1 #ifndef DALI_SCENE3D_LOADER_MESH_DEFINITION_H
2 #define DALI_SCENE3D_LOADER_MESH_DEFINITION_H
4 * Copyright (c) 2023 Samsung Electronics Co., Ltd.
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
21 #include <dali/public-api/common/vector-wrapper.h>
25 #include <dali-scene3d/public-api/api.h>
26 #include <dali-scene3d/public-api/loader/blend-shape-details.h>
27 #include <dali-scene3d/public-api/loader/buffer-definition.h>
28 #include <dali-scene3d/public-api/loader/index.h>
29 #include <dali-scene3d/public-api/loader/mesh-geometry.h>
30 #include <dali-scene3d/public-api/loader/utils.h>
32 namespace Dali::Scene3D::Loader
35 * @brief Defines a mesh with its attributes, the primitive type to render it as,
36 * and the file to load it from with the offset and length information for the
37 * individual attribute buffers.
39 struct DALI_SCENE3D_API MeshDefinition
41 using Vector = std::vector<std::pair<MeshDefinition, MeshGeometry>>;
45 INVALID = std::numeric_limits<uint32_t>::max()
50 FLIP_UVS_VERTICAL = NthBit(0),
51 U32_INDICES = NthBit(1), // default is unsigned short
52 U8_INDICES = NthBit(2), // default is unsigned short
53 U16_JOINT_IDS = NthBit(3), // default is floats
54 U8_JOINT_IDS = NthBit(4),
60 POSITIONS = NthBit(1),
62 TEX_COORDS = NthBit(3),
64 LEGACY_BITANGENTS = NthBit(5), // these are ignored; we're calculating them in the (PBR) shader.
66 WEIGHTS_0 = NthBit(7),
70 * @brief Describes raw data in terms of its position and size in a buffer.
75 uint32_t mOffset = INVALID; // the default means that the blob is undefined.
76 uint32_t mLength = 0; // if the blob is undefined, its data may still be generated. This is enabled by setting length to some non-0 value. Refer to MeshDefinition for details.
77 uint16_t mStride = 0; // ignore if 0
78 uint16_t mElementSizeHint = 0; // ignore if 0 or stride == 0
79 std::vector<float> mMin;
80 std::vector<float> mMax;
82 static void ComputeMinMax(std::vector<float>& min, std::vector<float>& max, uint32_t numComponents, uint32_t count, const float* values);
84 static void ApplyMinMax(const std::vector<float>& min, const std::vector<float>& max, uint32_t count, float* values);
88 Blob(const Blob&) = default;
89 Blob& operator=(const Blob&) = default;
91 Blob(Blob&&) = default;
92 Blob& operator=(Blob&&) = default;
94 Blob(uint32_t offset, uint32_t length, uint16_t stride = 0, uint16_t elementSizeHint = 0, const std::vector<float>& min = {}, const std::vector<float>& max = {});
97 * @brief Calculates the size of a tightly-packed buffer for the elements from the blob.
99 uint32_t GetBufferSize() const;
102 * @brief Convenience method to tell whether a Blob has meaningful data.
104 bool IsDefined() const
106 return mOffset != INVALID;
110 * @brief Convenience method to tell whether the elements stored in the blob follow each
111 * other tightly. The opposite would be interleaving.
113 bool IsConsecutive() const
115 return mStride == 0 || mStride == mElementSizeHint;
119 * @brief Computes the min / max of the input value data.
120 * The min and max are stored in mMin and mMax.
122 * @param[in] numComponents number of components of data type. e.g., 3 for Vector3.
123 * @param[in] count The number of data.
124 * @param[in] values Data for the mesh.
126 void ComputeMinMax(uint32_t numComponents, uint32_t count, float* values);
129 * @brief Applies the min / max values, if they're defined in the model
131 * @param[in] count The number of data.
132 * @param[in] values Data for the mesh that min / max values will be applied.
134 void ApplyMinMax(uint32_t count, float* values) const;
138 * @brief A sparse blob describes a change in a reference Blob.
139 * @p indices describe what positions of the reference Blob change and
140 * @p values describe the new values.
144 SparseBlob() = default;
146 SparseBlob(const SparseBlob&) = default;
147 SparseBlob& operator=(const SparseBlob&) = default;
149 SparseBlob(SparseBlob&&) = default;
150 SparseBlob& operator=(SparseBlob&&) = default;
152 SparseBlob(const Blob& indices, const Blob& values, uint32_t count);
153 SparseBlob(Blob&& indices, Blob&& values, uint32_t count);
157 uint32_t mCount = 0u;
163 std::unique_ptr<SparseBlob> mSparse;
164 Index mBufferIdx = INVALID_INDEX;
166 Accessor() = default;
168 Accessor(const Accessor&) = delete;
169 Accessor& operator=(const Accessor&) = delete;
171 Accessor(Accessor&&) = default;
172 Accessor& operator=(Accessor&&) = default;
174 Accessor(const MeshDefinition::Blob& blob,
175 const MeshDefinition::SparseBlob& sparse,
176 Index bufferIndex = INVALID_INDEX);
177 Accessor(MeshDefinition::Blob&& blob,
178 MeshDefinition::SparseBlob&& sparse,
179 Index bufferIndex = INVALID_INDEX);
181 bool IsDefined() const
183 return mBlob.IsDefined() || (mSparse && (mSparse->mIndices.IsDefined() && mSparse->mValues.IsDefined()));
188 * @brief Stores a blend shape.
204 Property::Type mType;
205 uint32_t mNumElements;
206 std::vector<uint8_t> mData;
208 void AttachBuffer(Geometry& g) const;
211 std::vector<uint16_t> mIndices;
212 std::vector<Attrib> mAttribs;
214 unsigned int mBlendShapeBufferOffset{0};
215 Dali::Vector<float> mBlendShapeUnnormalizeFactor;
216 PixelData mBlendShapeData;
219 MeshDefinition() = default;
221 MeshDefinition(const MeshDefinition&) = delete;
222 MeshDefinition& operator=(const MeshDefinition&) = delete;
224 MeshDefinition(MeshDefinition&&) = default;
225 MeshDefinition& operator=(MeshDefinition&&) = default;
228 * @brief Determines whether the mesh definition is that of a quad.
233 * @brief Determines whether the mesh is used for skeletal animation.
235 bool IsSkinned() const;
238 * @brief Whether the mesh has blend shapes.
240 bool HasBlendShapes() const;
243 * @brief Requests normals to be generated.
244 * @note Generation happens in LoadRaw().
245 * @note Must have Vector3 positions defined.
247 void RequestNormals();
250 * @brief Requests tangents to be generated.
251 * @note Generation happens in LoadRaw().
252 * @note Must have Vector3 normals defined.
254 void RequestTangents();
257 * @brief Loads raw geometry data, which includes index (optional) and
258 * attribute buffers, as well as blend shape data. This is then returned.
259 * @note This can be done on any thread.
261 RawData LoadRaw(const std::string& modelsPath, BufferDefinition::Vector& buffers);
264 * @brief Creates a MeshGeometry based firstly on the value of the uri member:
265 * if it is "quad", a textured quad is created; otherwise it uses the
266 * attribute (and index) buffers and blend shape information (if available)
268 * If mFlipVertical was set, the UVs are flipped in Y, i.e. v = 1.0 - v.
270 MeshGeometry Load(RawData&& raw) const;
273 * @brief Retrieves what Components information is in this mesh's BlendShape.
275 * @param[out] hasPositions True if the BlendShape has position components
276 * @param[out] hasNormals True if the BlendShape has normal components
277 * @param[out] hasTangents True if the BlendShape has tangent components
279 void RetrieveBlendShapeComponents(bool& hasPositions, bool& hasNormals, bool& hasTangents) const;
282 std::shared_ptr<RawData> mRawData;
283 uint32_t mFlags = 0x0;
284 Geometry::Type mPrimitiveType = Geometry::TRIANGLES;
285 std::string mUri; // When the mesh data is loaded from embedded resources, this URI is used as a data stream.
288 Accessor mNormals; // data can be generated based on positions
291 Accessor mTangents; // data can be generated based on normals and texCoords (the latter isn't mandatory; the results will be better if available)
294 Property::Type mTangentType{Property::VECTOR3};
296 Blob mBlendShapeHeader;
297 std::vector<BlendShape> mBlendShapes;
298 BlendShapes::Version mBlendShapeVersion = BlendShapes::Version::INVALID;
300 Index mSkeletonIdx = INVALID_INDEX;
301 ModelPrimitive mModelPrimitive;
304 } // namespace Dali::Scene3D::Loader
306 #endif //DALI_SCENE3D_LOADER_MESH_DEFINITION_H