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 /*
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 Open Asset Import Library (assimp)
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 Copyright (c) 2006-2024, assimp team
 
 All rights reserved.
 
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 with or without modification, are permitted provided that the following
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   following disclaimer.
 
 * Redistributions in binary form must reproduce the above
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 * Neither the name of the assimp team, nor the names of its
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 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
 
 /** @file scene.h
  *  @brief Defines the data structures in which the imported scene is returned.
  */
 #pragma once
 #ifndef AI_SCENE_H_INC
 #define AI_SCENE_H_INC
 
 #ifdef __GNUC__
 #   pragma GCC system_header
 #endif
 
 #include <assimp/types.h>
 #include <assimp/texture.h>
 #include <assimp/mesh.h>
 #include <assimp/light.h>
 #include <assimp/camera.h>
 #include <assimp/material.h>
 #include <assimp/anim.h>
 #include <assimp/metadata.h>
 
 #ifdef __cplusplus
 #  include <cstdlib>
 extern "C" {
 #endif
 
 #ifdef __GNUC__
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wattributes"
 #endif
 
 // -------------------------------------------------------------------------------
 /**
  * A node in the imported hierarchy.
  *
  * Each node has name, a parent node (except for the root node),
  * a transformation relative to its parent and possibly several child nodes.
  * Simple file formats don't support hierarchical structures - for these formats
  * the imported scene does consist of only a single root node without children.
  */
 // -------------------------------------------------------------------------------
 struct ASSIMP_API aiNode {
     /** The name of the node.
      *
      * The name might be empty (length of zero) but all nodes which
      * need to be referenced by either bones or animations are named.
      * Multiple nodes may have the same name, except for nodes which are referenced
      * by bones (see #aiBone and #aiMesh::mBones). Their names *must* be unique.
      *
      * Cameras and lights reference a specific node by name - if there
      * are multiple nodes with this name, they are assigned to each of them.
      * <br>
      * There are no limitations with regard to the characters contained in
      * the name string as it is usually taken directly from the source file.
      *
      * Implementations should be able to handle tokens such as whitespace, tabs,
      * line feeds, quotation marks, ampersands etc.
      *
      * Sometimes assimp introduces new nodes not present in the source file
      * into the hierarchy (usually out of necessity because sometimes the
      * source hierarchy format is simply not compatible). Their names are
      * surrounded by @verbatim <> @endverbatim e.g.
      *  @verbatim<DummyRootNode> @endverbatim.
      */
     C_STRUCT aiString mName;
 
     /** The transformation relative to the node's parent. */
     C_STRUCT aiMatrix4x4 mTransformation;
 
     /** Parent node. nullptr if this node is the root node. */
     C_STRUCT aiNode* mParent;
 
     /** The number of child nodes of this node. */
     unsigned int mNumChildren;
 
     /** The child nodes of this node. nullptr if mNumChildren is 0. */
     C_STRUCT aiNode** mChildren;
 
     /** The number of meshes of this node. */
     unsigned int mNumMeshes;
 
     /** The meshes of this node. Each entry is an index into the
       * mesh list of the #aiScene.
       */
     unsigned int* mMeshes;
 
     /** Metadata associated with this node or nullptr if there is no metadata.
       *  Whether any metadata is generated depends on the source file format. See the
       * @link importer_notes @endlink page for more information on every source file
       * format. Importers that don't document any metadata don't write any.
       */
     C_STRUCT aiMetadata* mMetaData;
 
 #ifdef __cplusplus
     /** Constructor */
     aiNode();
 
     /** Construction from a specific name */
     explicit aiNode(const std::string& name);
 
     /** Destructor */
     ~aiNode();
 
     /**
      *  @brief Searches for a node with a specific name, beginning at this
      *  nodes. Normally you will call this method on the root node
      *  of the scene.
      *
      *  @param name Name to search for
      *  @return nullptr or a valid Node if the search was successful.
      */
     inline const aiNode* FindNode(const aiString& name) const {
         return FindNode(name.data);
     }
 
     inline aiNode* FindNode(const aiString& name) {
         return FindNode(name.data);
     }
 
     /**
      * @brief Will search for a node described by its name.
      * @param[in] name  The name for the node to look for.
      * @return Pointer showing to the node or nullptr if not found.
      */
     const aiNode* FindNode(const char* name) const;
     aiNode* FindNode(const char* name);
 
     /**
      * @brief   Will add new children.
      * @param   numChildren  Number of children to add.
      * @param   children     The array with pointers showing to the children.
      */
     void addChildren(unsigned int numChildren, aiNode **children);
 #endif // __cplusplus
 };
 
 #ifdef __GNUC__
 #pragma GCC diagnostic pop
 #endif
 
 // -------------------------------------------------------------------------------
 /**
  * Specifies that the scene data structure that was imported is not complete.
  * This flag bypasses some internal validations and allows the import
  * of animation skeletons, material libraries or camera animation paths
  * using Assimp. Most applications won't support such data.
  */
 #define AI_SCENE_FLAGS_INCOMPLETE   0x1
 
 /**
  * This flag is set by the validation postprocess-step (aiPostProcess_ValidateDS)
  * if the validation is successful. In a validated scene you can be sure that
  * any cross references in the data structure (e.g. vertex indices) are valid.
  */
 #define AI_SCENE_FLAGS_VALIDATED    0x2
 
 /**
  * This flag is set by the validation postprocess-step (aiPostProcess_ValidateDS)
  * if the validation is successful but some issues have been found.
  * This can for example mean that a texture that does not exist is referenced
  * by a material or that the bone weights for a vertex don't sum to 1.0 ... .
  * In most cases you should still be able to use the import. This flag could
  * be useful for applications which don't capture Assimp's log output.
  */
 #define AI_SCENE_FLAGS_VALIDATION_WARNING   0x4
 
 /**
  * This flag is currently only set by the aiProcess_JoinIdenticalVertices step.
  * It indicates that the vertices of the output meshes aren't in the internal
  * verbose format anymore. In the verbose format all vertices are unique,
  * no vertex is ever referenced by more than one face.
  */
 #define AI_SCENE_FLAGS_NON_VERBOSE_FORMAT   0x8
 
  /**
  * Denotes pure height-map terrain data. Pure terrains usually consist of quads,
  * sometimes triangles, in a regular grid. The x,y coordinates of all vertex
  * positions refer to the x,y coordinates on the terrain height map, the z-axis
  * stores the elevation at a specific point.
  *
  * TER (Terragen) and HMP (3D Game Studio) are height map formats.
  * @note Assimp is probably not the best choice for loading *huge* terrains -
  * fully triangulated data takes extremely much free store and should be avoided
  * as long as possible (typically you'll do the triangulation when you actually
  * need to render it).
  */
 #define AI_SCENE_FLAGS_TERRAIN 0x10
 
  /**
  * Specifies that the scene data can be shared between structures. For example:
  * one vertex in few faces. \ref AI_SCENE_FLAGS_NON_VERBOSE_FORMAT can not be
  * used for this because \ref AI_SCENE_FLAGS_NON_VERBOSE_FORMAT has internal
  * meaning about postprocessing steps.
  */
 #define AI_SCENE_FLAGS_ALLOW_SHARED         0x20
 
 // -------------------------------------------------------------------------------
 /** The root structure of the imported data.
  *
  *  Everything that was imported from the given file can be accessed from here.
  *  Objects of this class are generally maintained and owned by Assimp, not
  *  by the caller. You shouldn't want to instance it, nor should you ever try to
  *  delete a given scene on your own.
  */
 // -------------------------------------------------------------------------------
 struct ASSIMP_API aiScene {
     /** Any combination of the AI_SCENE_FLAGS_XXX flags. By default
     * this value is 0, no flags are set. Most applications will
     * want to reject all scenes with the AI_SCENE_FLAGS_INCOMPLETE
     * bit set.
     */
     unsigned int mFlags;
 
     /** The root node of the hierarchy.
     *
     * There will always be at least the root node if the import
     * was successful (and no special flags have been set).
     * Presence of further nodes depends on the format and content
     * of the imported file.
     */
     C_STRUCT aiNode* mRootNode;
 
     /** The number of meshes in the scene. */
     unsigned int mNumMeshes;
 
     /** The array of meshes.
     *
     * Use the indices given in the aiNode structure to access
     * this array. The array is mNumMeshes in size. If the
     * AI_SCENE_FLAGS_INCOMPLETE flag is not set there will always
     * be at least ONE material.
     */
     C_STRUCT aiMesh** mMeshes;
 
     /** The number of materials in the scene. */
     unsigned int mNumMaterials;
 
     /** The array of materials.
     *
     * Use the index given in each aiMesh structure to access this
     * array. The array is mNumMaterials in size. If the
     * AI_SCENE_FLAGS_INCOMPLETE flag is not set there will always
     * be at least ONE material.
     */
     C_STRUCT aiMaterial** mMaterials;
 
     /** The number of animations in the scene. */
     unsigned int mNumAnimations;
 
     /** The array of animations.
     *
     * All animations imported from the given file are listed here.
     * The array is mNumAnimations in size.
     */
     C_STRUCT aiAnimation** mAnimations;
 
     /** The number of textures embedded into the file */
     unsigned int mNumTextures;
 
     /** The array of embedded textures.
     *
     * Not many file formats embed their textures into the file.
     * An example is Quake's MDL format (which is also used by
     * some GameStudio versions)
     */
     C_STRUCT aiTexture** mTextures;
 
     /** The number of light sources in the scene. Light sources
     * are fully optional, in most cases this attribute will be 0
         */
     unsigned int mNumLights;
 
     /** The array of light sources.
     *
     * All light sources imported from the given file are
     * listed here. The array is mNumLights in size.
     */
     C_STRUCT aiLight** mLights;
 
     /** The number of cameras in the scene. Cameras
     * are fully optional, in most cases this attribute will be 0
         */
     unsigned int mNumCameras;
 
     /** The array of cameras.
     *
     * All cameras imported from the given file are listed here.
     * The array is mNumCameras in size. The first camera in the
     * array (if existing) is the default camera view into
     * the scene.
     */
     C_STRUCT aiCamera** mCameras;
 
     /**
      *  @brief  The global metadata assigned to the scene itself.
      *
      *  This data contains global metadata which belongs to the scene like
      *  unit-conversions, versions, vendors or other model-specific data. This
      *  can be used to store format-specific metadata as well.
      */
     C_STRUCT aiMetadata* mMetaData;
 
     /** The name of the scene itself.
      */
     C_STRUCT aiString mName;
 
     /**
      *
      */
     unsigned int mNumSkeletons;
 
     /**
      *
      */
     C_STRUCT aiSkeleton **mSkeletons;
 
 #ifdef __cplusplus
 
     //! Default constructor - set everything to 0/nullptr
     aiScene();
 
     //! Destructor
     ~aiScene();
 
     //! Check whether the scene contains meshes
     //! Unless no special scene flags are set this will always be true.
     inline bool HasMeshes() const {
         return mMeshes != nullptr && mNumMeshes > 0;
     }
 
     //! Check whether the scene contains materials
     //! Unless no special scene flags are set this will always be true.
     inline bool HasMaterials() const {
         return mMaterials != nullptr && mNumMaterials > 0;
     }
 
     //! Check whether the scene contains lights
     inline bool HasLights() const {
         return mLights != nullptr && mNumLights > 0;
     }
 
     //! Check whether the scene contains textures
     inline bool HasTextures() const {
         return mTextures != nullptr && mNumTextures > 0;
     }
 
     //! Check whether the scene contains cameras
     inline bool HasCameras() const {
         return mCameras != nullptr && mNumCameras > 0;
     }
 
     //! Check whether the scene contains animations
     inline bool HasAnimations() const {
         return mAnimations != nullptr && mNumAnimations > 0;
     }
 
     bool hasSkeletons() const {
         return mSkeletons != nullptr && mNumSkeletons > 0;
     }
 
     //! Returns a short filename from a full path
     static const char* GetShortFilename(const char* filename) {
         const char* lastSlash = strrchr(filename, '/');
         const char* lastBackSlash = strrchr(filename, '\\');
         if (lastSlash < lastBackSlash) {
             lastSlash = lastBackSlash;
         }
         const char* shortFilename = lastSlash != nullptr ? lastSlash + 1 : filename;
         return shortFilename;
     }
 
     //! Returns an embedded texture
     const aiTexture* GetEmbeddedTexture(const char* filename) const {
         return GetEmbeddedTextureAndIndex(filename).first;
     }
 
     //! Returns an embedded texture and its index
     std::pair<const aiTexture*, int> GetEmbeddedTextureAndIndex(const char* filename) const {
         if (nullptr==filename) {
             return std::make_pair(nullptr, -1);
         }
         // lookup using texture ID (if referenced like: "*1", "*2", etc.)
         if ('*' == *filename) {
             int index = std::atoi(filename + 1);
             if (0 > index || mNumTextures <= static_cast<unsigned>(index)) {
                 return std::make_pair(nullptr, -1);
             }
             return std::make_pair(mTextures[index], index);
         }
         // lookup using filename
         const char* shortFilename = GetShortFilename(filename);
         if (nullptr == shortFilename) {
             return std::make_pair(nullptr, -1);
         }
 
         for (unsigned int i = 0; i < mNumTextures; i++) {
             const char* shortTextureFilename = GetShortFilename(mTextures[i]->mFilename.C_Str());
             if (strcmp(shortTextureFilename, shortFilename) == 0) {
                 return std::make_pair(mTextures[i], static_cast<int>(i));
             }
         }
         return std::make_pair(nullptr, -1);
     }
 #endif // __cplusplus
 
     /**  Internal data, do not touch */
 #ifdef __cplusplus
     void* mPrivate;
 #else
     char* mPrivate;
 #endif
 
 };
 
 #ifdef __cplusplus
 }
 #endif //! extern "C"
 
 #endif // AI_SCENE_H_INC

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