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#![feature(proc_macro, custom_attribute)]
extern crate serde;
#[macro_use]
extern crate serde_derive;
extern crate serde_json;
use std::fs::File;
use std::io::Read;
use std::path::Path;
use serde_json::from_str;
pub use serde_json::value::{Map, Value};
pub trait Find<T> {
fn find(&self, id: &str) -> Option<&T>;
}
#[derive(Debug)]
pub enum Error {
Io(std::io::Error),
Parse(serde_json::error::Error),
}
impl From<std::io::Error> for Error {
fn from(err: std::io::Error) -> Error {
Error::Io(err)
}
}
impl From<serde_json::error::Error> for Error {
fn from(err: serde_json::error::Error) -> Error {
Error::Parse(err)
}
}
#[derive(Debug, Deserialize, Serialize)]
pub struct Accessor {
#[serde(rename = "bufferView")]
pub buffer_view: String,
#[serde(rename = "byteOffset")]
pub byte_offset: u32,
#[serde(rename = "byteStride")]
pub byte_stride: u32,
#[serde(rename = "componentType")]
pub component_type: u32,
pub count: u32,
#[serde(rename = "type")]
pub data_type: String,
pub extensions: Option<Map<String, Value>>,
pub extras: Option<Map<String, Value>>,
pub max: Option<[f32; 3]>,
pub min: Option<[f32; 3]>,
pub name: Option<String>,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct Buffer {
#[serde(rename = "byteLength")]
pub byte_length: u32,
#[serde(rename = "type")]
pub type_id: String,
pub uri: String,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct BufferView {
pub buffer: String,
#[serde(rename = "byteLength")]
pub byte_length: u32,
#[serde(rename = "byteOffset")]
pub byte_offset: u32,
pub target: u32,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct StateFunctions {
#[serde(rename = "blendColor")]
pub blend_color: Option<[f64; 4]>,
#[serde(rename = "blendEquationSeparate")]
pub blend_equation: Option<[u32; 2]>,
#[serde(rename = "blendFuncSeparate")]
pub blend_function: Option<[bool; 4]>,
#[serde(rename = "colorMask")]
pub color_mask: Option<[bool; 4]>,
#[serde(rename = "cullFace")]
pub cull_face: Option<u32>,
#[serde(rename = "depthFunc")]
pub depth_function: Option<u32>,
#[serde(rename = "depthRange")]
pub depth_range: Option<[f32; 2]>,
#[serde(rename = "frontFace")]
pub front_face: Option<u32>,
#[serde(rename = "lineWidth")]
pub line_width: Option<f32>,
#[serde(rename = "polygonOffset")]
pub polygon_offset: Option<[f32; 2]>,
#[serde(rename = "scissor")]
pub scissor: Option<[u32; 4]>,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct States {
pub enable: Vec<u32>,
pub functions: StateFunctions,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct Material {
pub name: String,
pub technique: String,
pub values: Map<String, Value>,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct Mesh {
pub name: String,
pub primitives: Vec<Primitive>,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct Node {
pub meshes: Vec<String>,
pub name: String,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct Parameter {
pub semantic: Option<String>,
#[serde(rename = "type")]
pub type_id: u32,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct Program {
pub attributes: Vec<String>,
#[serde(rename = "fragmentShader")]
pub fragment_shader: String,
#[serde(rename = "vertexShader")]
pub vertex_shader: String,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct Primitive {
pub attributes: Map<String, String>,
pub indices: Option<String>,
pub material: String,
pub mode: u32,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct Shader {
#[serde(rename = "type")]
pub type_id: u32,
pub uri: String,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct Technique {
pub attributes: Map<String, String>,
pub uniforms: Map<String, String>,
pub parameters: Map<String, Parameter>,
pub program: String,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct Gltf {
pub accessors: Map<String, Accessor>,
#[serde(rename = "buffers")]
pub buffers: Map<String, Buffer>,
#[serde(rename = "bufferViews")]
pub buffer_views: Map<String, BufferView>,
pub materials: Map<String, Material>,
pub meshes: Map<String, Mesh>,
pub programs: Map<String, Program>,
pub shaders: Map<String, Shader>,
pub techniques: Map<String, Technique>,
}
macro_rules! impl_find {
($ident:ident, $ty:ty) => (
impl Find<$ty> for Gltf {
fn find(&self, id: &str) -> Option<&$ty> {
self.$ident
.iter()
.find(|&(entry_id, _)| entry_id == id)
.map(|(_, entry)| entry)
}
}
)
}
impl_find!(accessors, Accessor);
impl_find!(buffers, Buffer);
impl_find!(buffer_views, BufferView);
impl_find!(materials, Material);
impl_find!(meshes, Mesh);
impl_find!(programs, Program);
impl_find!(shaders, Shader);
impl_find!(techniques, Technique);
impl Gltf {
pub fn new<P: AsRef<Path>>(path: P) -> Result<Self, Error> {
let mut file = try!(File::open(path));
let mut json = String::new();
try!(file.read_to_string(&mut json));
match from_str(&json) {
Ok(gltf) => Ok(gltf),
Err(cause) => Err(Error::Parse(cause)),
}
}
pub fn find<T>(&self, id: &str) -> Option<&T>
where Self: Find<T>
{
(self as &Find<T>).find(id)
}
}