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source/engine/thirdparty/cgltf/LICENSE
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source/engine/thirdparty/cgltf/LICENSE
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Copyright (c) 2018-2021 Johannes Kuhlmann
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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source/engine/thirdparty/cgltf/README.md
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# :diamond_shape_with_a_dot_inside: cgltf
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**Single-file/stb-style C glTF loader and writer**
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[![Build Status](https://github.com/jkuhlmann/cgltf/workflows/build/badge.svg)](https://github.com/jkuhlmann/cgltf/actions)
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Used in: [bgfx](https://github.com/bkaradzic/bgfx), [Filament](https://github.com/google/filament), [gltfpack](https://github.com/zeux/meshoptimizer/tree/master/gltf), [raylib](https://github.com/raysan5/raylib), [Unigine](https://developer.unigine.com/en/docs/2.14.1/third_party?rlang=cpp#cgltf), and more!
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## Usage: Loading
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Loading from file:
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```c
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#define CGLTF_IMPLEMENTATION
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#include "cgltf.h"
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cgltf_options options = {0};
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cgltf_data* data = NULL;
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cgltf_result result = cgltf_parse_file(&options, "scene.gltf", &data);
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if (result == cgltf_result_success)
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{
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/* TODO make awesome stuff */
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cgltf_free(data);
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}
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```
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Loading from memory:
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```c
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#define CGLTF_IMPLEMENTATION
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#include "cgltf.h"
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void* buf; /* Pointer to glb or gltf file data */
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size_t size; /* Size of the file data */
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cgltf_options options = {0};
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cgltf_data* data = NULL;
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cgltf_result result = cgltf_parse(&options, buf, size, &data);
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if (result == cgltf_result_success)
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{
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/* TODO make awesome stuff */
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cgltf_free(data);
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}
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```
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Note that cgltf does not load the contents of extra files such as buffers or images into memory by default. You'll need to read these files yourself using URIs from `data.buffers[]` or `data.images[]` respectively.
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For buffer data, you can alternatively call `cgltf_load_buffers`, which will use `FILE*` APIs to open and read buffer files. This automatically decodes base64 data URIs in buffers. For data URIs in images, you will need to use `cgltf_load_buffer_base64`.
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**For more in-depth documentation and a description of the public interface refer to the top of the `cgltf.h` file.**
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## Usage: Writing
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When writing glTF data, you need a valid `cgltf_data` structure that represents a valid glTF document. You can construct such a structure yourself or load it using the loader functions described above. The writer functions do not deallocate any memory. So, you either have to do it manually or call `cgltf_free()` if you got the data by loading it from a glTF document.
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Writing to file:
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```c
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#define CGLTF_IMPLEMENTATION
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#define CGLTF_WRITE_IMPLEMENTATION
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#include "cgltf_write.h"
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cgltf_options options = {0};
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cgltf_data* data = /* TODO must be valid data */;
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cgltf_result result = cgltf_write_file(&options, "out.gltf", data);
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if (result != cgltf_result_success)
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{
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/* TODO handle error */
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}
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```
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Writing to memory:
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```c
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#define CGLTF_IMPLEMENTATION
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#define CGLTF_WRITE_IMPLEMENTATION
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#include "cgltf_write.h"
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cgltf_options options = {0};
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cgltf_data* data = /* TODO must be valid data */;
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cgltf_size size = cgltf_write(&options, NULL, 0, data);
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char* buf = malloc(size);
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cgltf_size written = cgltf_write(&options, buf, size, data);
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if (written != size)
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{
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/* TODO handle error */
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}
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```
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Note that cgltf does not write the contents of extra files such as buffers or images. You'll need to write this data yourself.
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**For more in-depth documentation and a description of the public interface refer to the top of the `cgltf_write.h` file.**
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## Features
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cgltf supports core glTF 2.0:
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- glb (binary files) and gltf (JSON files)
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- meshes (including accessors, buffer views, buffers)
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- materials (including textures, samplers, images)
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- scenes and nodes
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- skins
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- animations
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- cameras
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- morph targets
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- extras data
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cgltf also supports some glTF extensions:
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- EXT_meshopt_compression
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- KHR_draco_mesh_compression (requires a library like [Google's Draco](https://github.com/google/draco) for decompression though)
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- KHR_lights_punctual
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- KHR_materials_clearcoat
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- KHR_materials_ior
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- KHR_materials_pbrSpecularGlossiness
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- KHR_materials_sheen
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- KHR_materials_specular
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- KHR_materials_transmission
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- KHR_materials_unlit
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- KHR_materials_variants
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- KHR_materials_volume
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- KHR_texture_transform
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cgltf does **not** yet support unlisted extensions. However, unlisted extensions can be accessed via "extensions" member on objects.
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## Building
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The easiest approach is to integrate the `cgltf.h` header file into your project. If you are unfamiliar with single-file C libraries (also known as stb-style libraries), this is how it goes:
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1. Include `cgltf.h` where you need the functionality.
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1. Have exactly one source file that defines `CGLTF_IMPLEMENTATION` before including `cgltf.h`.
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1. Use the cgltf functions as described above.
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Support for writing can be found in a separate file called `cgltf_write.h` (which includes `cgltf.h`). Building it works analogously using the `CGLTF_WRITE_IMPLEMENTATION` define.
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## Contributing
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Everyone is welcome to contribute to the library. If you find any problems, you can submit them using [GitHub's issue system](https://github.com/jkuhlmann/cgltf/issues). If you want to contribute code, you should fork the project and then send a pull request.
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## Dependencies
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None.
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C headers being used by implementation:
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```
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <limits.h>
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```
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Note, this library has a copy of the [JSMN JSON parser](https://github.com/zserge/jsmn) embedded in its source.
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## Testing
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There is a Python script in the `test/` folder that retrieves the glTF 2.0 sample files from the glTF-Sample-Models repository (https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0) and runs the library against all gltf and glb files.
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Here's one way to build and run the test:
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cd test ; mkdir build ; cd build ; cmake .. -DCMAKE_BUILD_TYPE=Debug
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make -j
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cd ..
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./test_all.py
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There is also a llvm-fuzz test in `fuzz/`. See http://llvm.org/docs/LibFuzzer.html for more information.
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