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vendor/cgltf/README.md
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vendor/cgltf/README.md
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# :diamond_shape_with_a_dot_inside: cgltf
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**glTF loader and writer**
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(**Single-file/stb-style C glTF loader and writer**)
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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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```odin
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package main
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import "vendor:cgltf"
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main :: proc() {
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options: cgltf.options
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data, result := cgltf.parse_file(&options, "scene.gltf")
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if result != .success {
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/* TODO handle error */
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}
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defer cgltf.free(data)
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/* TODO make awesome stuff */
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}
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```
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Loading from memory:
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```odin
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package main
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import "vendor:cgltf"
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main :: proc() {
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buf: []byte = ... // data to glb or gltf file data
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options: cgltf.options
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data, result := cgltf.parse(&options, raw_data(buf), len(buf))
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if result != .success {
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/* TODO handle error */
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}
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defer cgltf.free(data)
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/* TODO make awesome stuff */
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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 `^clib.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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```odin
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package main
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import "vendor:cgltf"
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main :: proc() {
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options: cgltf.options
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data: ^cgltf.data = /* TODO must be valid data */
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result := cgltf.write_file(&options, "out.gltf", data)
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if result != .success {
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/* TODO handle error */
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}
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}
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```
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Writing to memory:
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```c
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package main
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import "vendor:cgltf"
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main :: proc() {
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options: cgltf.options
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data: ^cgltf.data = /* TODO must be valid data */
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size := cgltf.write(&options, nil, 0, data)
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buf := make([]byte, size)
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written := cgltf.write(&options, raw_data(buf), size, data)
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if written != size {
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/* TODO handle error */
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}
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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_mesh_gpu_instancing
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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_emissive_strength
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- KHR_materials_ior
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- KHR_materials_iridescence
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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_basisu (requires a library like [Binomial Basisu](https://github.com/BinomialLLC/basis_universal) for transcoding to native compressed texture)
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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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## 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 the 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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#include <assert.h> // If asserts are enabled.
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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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