1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165

use gltf_derive::Validate;
use serde::{de, ser};
use serde_derive::{Serialize, Deserialize};
use std::fmt;
use crate::validation::{Checked, Error, Validate};
use crate::{extensions, Extras, Root, Path};

/// All valid camera types.
pub const VALID_CAMERA_TYPES: &'static [&'static str] = &[
    "perspective",
    "orthographic",
];

/// Specifies the camera type.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum Type {
    /// A perspective projection.
    Perspective = 1,

    /// An orthographic projection.
    Orthographic,
}

/// A camera's projection.
///
/// A node can reference a camera to apply a transform to place the camera in the
/// scene.
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Camera {
    /// Optional user-defined name for this object.
    #[cfg(feature = "names")]
    #[cfg_attr(feature = "names", serde(skip_serializing_if = "Option::is_none"))]
    pub name: Option<String>,

    /// An orthographic camera containing properties to create an orthographic
    /// projection matrix.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub orthographic: Option<Orthographic>,

    /// A perspective camera containing properties to create a perspective
    /// projection matrix.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub perspective: Option<Perspective>,

    /// Specifies if the camera uses a perspective or orthographic projection.
    #[serde(rename = "type")]
    pub type_: Checked<Type>,

    /// Extension specific data.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub extensions: Option<extensions::camera::Camera>,

    /// Optional application specific data.
    #[serde(default)]
    #[cfg_attr(feature = "extras", serde(skip_serializing_if = "Option::is_none"))]
    pub extras: Extras,
}

/// Values for an orthographic camera.
#[derive(Clone, Debug, Deserialize, Serialize, Validate)]
pub struct Orthographic {
    /// The horizontal magnification of the view.
    pub xmag: f32,

    /// The vertical magnification of the view.
    pub ymag: f32,

    /// The distance to the far clipping plane.
    pub zfar: f32,

    /// The distance to the near clipping plane.
    pub znear: f32,

    /// Extension specific data.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub extensions: Option<extensions::camera::Orthographic>,

    /// Optional application specific data.
    #[serde(default)]
    #[cfg_attr(feature = "extras", serde(skip_serializing_if = "Option::is_none"))]
    pub extras: Extras,
}

/// Values for a perspective camera.
#[derive(Clone, Debug, Deserialize, Serialize, Validate)]
pub struct Perspective {
    /// Aspect ratio of the field of view.
    #[serde(rename = "aspectRatio")]
    #[serde(skip_serializing_if = "Option::is_none")]
    pub aspect_ratio: Option<f32>,

    /// The vertical field of view in radians.
    pub yfov: f32,

    /// The distance to the far clipping plane.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub zfar: Option<f32>,

    /// The distance to the near clipping plane.
    pub znear: f32,

    /// Extension specific data.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub extensions: Option<extensions::camera::Perspective>,

    /// Optional application specific data.
    #[serde(default)]
    #[cfg_attr(feature = "extras", serde(skip_serializing_if = "Option::is_none"))]
    pub extras: Extras,
}

impl Validate for Camera {
    fn validate<P, R>(&self, root: &Root, path: P, report: &mut R)
        where P: Fn() -> Path, R: FnMut(&dyn Fn() -> Path, Error)
    {
        if self.orthographic.is_none() && self.perspective.is_none() {
            report(&path, Error::Missing);
        }

        self.orthographic.validate(root, || path().field("orthographic"), report);
        self.perspective.validate(root, || path().field("perspective"), report);
        self.type_.validate(root, || path().field("type"), report);
        self.extensions.validate(root, || path().field("extensions"), report);
        self.extras.validate(root, || path().field("extras"), report);
    }
}

impl<'de> de::Deserialize<'de> for Checked<Type> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
        where D: de::Deserializer<'de>
    {
        struct Visitor;
        impl<'de> de::Visitor<'de> for Visitor {
            type Value = Checked<Type>;

            fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
                write!(f, "any of: {:?}", VALID_CAMERA_TYPES)
            }

            fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
                where E: de::Error
            {
                use self::Type::*;
                use crate::validation::Checked::*;
                Ok(match value {
                    "perspective" => Valid(Perspective),
                    "orthographic" => Valid(Orthographic),
                    _ => Invalid,
                })
            }
        }
        deserializer.deserialize_str(Visitor)
    }
}

impl ser::Serialize for Type {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
        where S: ser::Serializer
    {
        match *self {
            Type::Perspective => serializer.serialize_str("perspective"),
            Type::Orthographic => serializer.serialize_str("orthographic"),
        }
    }
}