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-/**
- * @file LLGLTFLoader.h
- * @brief LLGLTFLoader class definition
- *
- * $LicenseInfo:firstyear=2022&license=viewerlgpl$
- * Second Life Viewer Source Code
- * Copyright (C) 2022, Linden Research, Inc.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation;
- * version 2.1 of the License only.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
- * $/LicenseInfo$
- */
-
-#ifndef LL_LLGLTFLoader_H
-#define LL_LLGLTFLoader_H
-
-#include "tinygltf/tiny_gltf.h"
-
-#include "llglheaders.h"
-#include "llmodelloader.h"
-
-// gltf_* structs are temporary, used to organize the subset of data that eventually goes into the material LLSD
-
-class gltf_sampler
-{
-public:
- // Uses GL enums
- S32 minFilter; // GL_NEAREST, GL_LINEAR, GL_NEAREST_MIPMAP_NEAREST, GL_LINEAR_MIPMAP_NEAREST, GL_NEAREST_MIPMAP_LINEAR or GL_LINEAR_MIPMAP_LINEAR
- S32 magFilter; // GL_NEAREST or GL_LINEAR
- S32 wrapS; // GL_CLAMP_TO_EDGE, GL_MIRRORED_REPEAT or GL_REPEAT
- S32 wrapT; // GL_CLAMP_TO_EDGE, GL_MIRRORED_REPEAT or GL_REPEAT
- //S32 wrapR; // Found in some sample files, but not part of glTF 2.0 spec. Ignored.
- std::string name; // optional, currently unused
- // extensions and extras are sampler optional fields that we don't support - at least initially
-};
-
-class gltf_image
-{
-public:// Note that glTF images are defined with row 0 at the top (opposite of OpenGL)
- U8* data; // ptr to decoded image data
- U32 size; // in bytes, regardless of channel width
- U32 width;
- U32 height;
- U32 numChannels; // range 1..4
- U32 bytesPerChannel; // converted from gltf "bits", expects only 8, 16 or 32 as input
- U32 pixelType; // one of (TINYGLTF_COMPONENT_TYPE)_UNSIGNED_BYTE, _UNSIGNED_SHORT, _UNSIGNED_INT, or _FLOAT
-};
-
-class gltf_texture
-{
-public:
- U32 imageIdx;
- U32 samplerIdx;
- LLUUID imageUuid = LLUUID::null;
-};
-
-class gltf_render_material
-{
-public:
- std::string name;
-
- // scalar values
- LLColor4 baseColor; // linear encoding. Multiplied with vertex color, if present.
- double metalness;
- double roughness;
- double normalScale; // scale applies only to X,Y components of normal
- double occlusionScale; // strength multiplier for occlusion
- LLColor4 emissiveColor; // emissive mulitiplier, assumed linear encoding (spec 2.0 is silent)
- std::string alphaMode; // "OPAQUE", "MASK" or "BLEND"
- double alphaMask; // alpha cut-off
-
- // textures
- U32 baseColorTexIdx; // always sRGB encoded
- U32 metalRoughTexIdx; // always linear, roughness in G channel, metalness in B channel
- U32 normalTexIdx; // linear, valid range R[0-1], G[0-1], B[0.5-1]. Normal = texel * 2 - vec3(1.0)
- U32 occlusionTexIdx; // linear, occlusion in R channel, 0 meaning fully occluded, 1 meaning not occluded
- U32 emissiveTexIdx; // always stored as sRGB, in nits (candela / meter^2)
-
- // texture coordinates
- U32 baseColorTexCoords;
- U32 metalRoughTexCoords;
- U32 normalTexCoords;
- U32 occlusionTexCoords;
- U32 emissiveTexCoords;
-
- // TODO: Add traditional (diffuse, normal, specular) UUIDs here, or add this struct to LL_TextureEntry??
-
- bool hasPBR;
- bool hasBaseTex, hasMRTex, hasNormalTex, hasOcclusionTex, hasEmissiveTex;
-
- // This field is populated after upload
- LLUUID material_uuid = LLUUID::null;
-
-};
-
-class gltf_mesh
-{
-public:
- std::string name;
-
- // TODO add mesh import DJH 2022-04
-
-};
-
-class LLGLTFLoader : public LLModelLoader
-{
- public:
- typedef std::map<std::string, LLImportMaterial> material_map;
-
- LLGLTFLoader(std::string filename,
- S32 lod,
- LLModelLoader::load_callback_t load_cb,
- LLModelLoader::joint_lookup_func_t joint_lookup_func,
- LLModelLoader::texture_load_func_t texture_load_func,
- LLModelLoader::state_callback_t state_cb,
- void * opaque_userdata,
- JointTransformMap & jointTransformMap,
- JointNameSet & jointsFromNodes,
- std::map<std::string, std::string> &jointAliasMap,
- U32 maxJointsPerMesh,
- U32 modelLimit); //,
- //bool preprocess );
- virtual ~LLGLTFLoader();
-
- virtual bool OpenFile(const std::string &filename);
-
-protected:
- tinygltf::Model mGltfModel;
- bool mGltfLoaded;
- bool mMeshesLoaded;
- bool mMaterialsLoaded;
-
- std::vector<gltf_mesh> mMeshes;
- std::vector<gltf_render_material> mMaterials;
-
- std::vector<gltf_texture> mTextures;
- std::vector<gltf_image> mImages;
- std::vector<gltf_sampler> mSamplers;
-
-private:
- bool parseMeshes();
- void uploadMeshes();
- bool parseMaterials();
- void uploadMaterials();
- bool populateModelFromMesh(LLModel* pModel, const tinygltf::Mesh &mesh);
- LLUUID imageBufferToTextureUUID(const gltf_texture& tex);
-
- // bool mPreprocessGLTF;
-
- /* Below inherited from dae loader - unknown if/how useful here
-
- void processElement(gltfElement *element, bool &badElement, GLTF *gltf);
- void processGltfModel(LLModel *model, GLTF *gltf, gltfElement *pRoot, gltfMesh *mesh, gltfSkin *skin);
-
- material_map getMaterials(LLModel *model, gltfInstance_geometry *instance_geo, GLTF *gltf);
- LLImportMaterial profileToMaterial(gltfProfile_COMMON *material, GLTF *gltf);
- LLColor4 getGltfColor(gltfElement *element);
-
- gltfElement *getChildFromElement(gltfElement *pElement, std::string const &name);
-
- bool isNodeAJoint(gltfNode *pNode);
- void processJointNode(gltfNode *pNode, std::map<std::string, LLMatrix4> &jointTransforms);
- void extractTranslation(gltfTranslate *pTranslate, LLMatrix4 &transform);
- void extractTranslationViaElement(gltfElement *pTranslateElement, LLMatrix4 &transform);
- void extractTranslationViaSID(gltfElement *pElement, LLMatrix4 &transform);
- void buildJointToNodeMappingFromScene(gltfElement *pRoot);
- void processJointToNodeMapping(gltfNode *pNode);
- void processChildJoints(gltfNode *pParentNode);
-
- bool verifyCount(int expected, int result);
-
- // Verify that a controller matches vertex counts
- bool verifyController(gltfController *pController);
-
- static bool addVolumeFacesFromGltfMesh(LLModel *model, gltfMesh *mesh, LLSD &log_msg);
- static bool createVolumeFacesFromGltfMesh(LLModel *model, gltfMesh *mesh);
-
- static LLModel *loadModelFromGltfMesh(gltfMesh *mesh);
-
- // Loads a mesh breaking it into one or more models as necessary
- // to get around volume face limitations while retaining >8 materials
- //
- bool loadModelsFromGltfMesh(gltfMesh *mesh, std::vector<LLModel *> &models_out, U32 submodel_limit);
-
- static std::string getElementLabel(gltfElement *element);
- static size_t getSuffixPosition(std::string label);
- static std::string getLodlessLabel(gltfElement *element);
-
- static std::string preprocessGLTF(std::string filename);
- */
-
-};
-#endif // LL_LLGLTFLLOADER_H
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