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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
#[cfg(feature = "import")]
use std::ops;

use crate::Document;

pub use json::buffer::Target;
#[cfg(feature = "extensions")]
use serde_json::{Map, Value};

/// A buffer points to binary data representing geometry, animations, or skins.
#[derive(Clone, Debug)]
pub struct Buffer<'a> {
    /// The parent `Document` struct.
    #[allow(dead_code)]
    document: &'a Document,

    /// The corresponding JSON index.
    index: usize,

    /// The corresponding JSON struct.
    json: &'a json::buffer::Buffer,
}

/// A view into a buffer generally representing a subset of the buffer.
#[derive(Clone, Debug)]
pub struct View<'a> {
    /// The parent `Document` struct.
    document: &'a Document,

    /// The corresponding JSON index.
    index: usize,

    /// The corresponding JSON struct.
    json: &'a json::buffer::View,

    /// The parent `Buffer`.
    #[allow(dead_code)]
    parent: Buffer<'a>,
}

/// Describes a buffer data source.
#[derive(Clone, Debug)]
pub enum Source<'a> {
    /// Buffer data is contained in the `BIN` section of binary glTF.
    Bin,

    /// Buffer data is contained in an external data source.
    Uri(&'a str),
}

/// Buffer data belonging to an imported glTF asset.
#[cfg(feature = "import")]
#[cfg_attr(docsrs, doc(cfg(feature = "import")))]
#[derive(Clone, Debug)]
pub struct Data(pub Vec<u8>);

#[cfg(feature = "import")]
#[cfg_attr(docsrs, doc(cfg(feature = "import")))]
impl ops::Deref for Data {
    type Target = [u8];
    fn deref(&self) -> &Self::Target {
        self.0.as_slice()
    }
}

impl<'a> Buffer<'a> {
    /// Constructs a `Buffer`.
    pub(crate) fn new(
        document: &'a Document,
        index: usize,
        json: &'a json::buffer::Buffer,
    ) -> Self {
        Self {
            document,
            index,
            json,
        }
    }

    /// Returns the internal JSON index.
    pub fn index(&self) -> usize {
        self.index
    }

    /// Returns the buffer data source.
    pub fn source(&self) -> Source<'a> {
        if let Some(uri) = self.json.uri.as_deref() {
            Source::Uri(uri)
        } else {
            Source::Bin
        }
    }

    /// The length of the buffer in bytes.
    pub fn length(&self) -> usize {
        self.json.byte_length.0 as usize
    }

    /// Optional user-defined name for this object.
    #[cfg(feature = "names")]
    #[cfg_attr(docsrs, doc(cfg(feature = "names")))]
    pub fn name(&self) -> Option<&'a str> {
        self.json.name.as_deref()
    }

    /// Returns extension data unknown to this crate version.
    #[cfg(feature = "extensions")]
    #[cfg_attr(docsrs, doc(cfg(feature = "extensions")))]
    pub fn extensions(&self) -> Option<&Map<String, Value>> {
        let ext = self.json.extensions.as_ref()?;
        Some(&ext.others)
    }

    /// Queries extension data unknown to this crate version.
    #[cfg(feature = "extensions")]
    #[cfg_attr(docsrs, doc(cfg(feature = "extensions")))]
    pub fn extension_value(&self, ext_name: &str) -> Option<&Value> {
        let ext = self.json.extensions.as_ref()?;
        ext.others.get(ext_name)
    }

    /// Optional application specific data.
    pub fn extras(&self) -> &'a json::Extras {
        &self.json.extras
    }
}

impl<'a> View<'a> {
    /// Constructs a `View`.
    pub(crate) fn new(document: &'a Document, index: usize, json: &'a json::buffer::View) -> Self {
        let parent = document.buffers().nth(json.buffer.value()).unwrap();
        Self {
            document,
            index,
            json,
            parent,
        }
    }

    /// Returns the internal JSON index.
    pub fn index(&self) -> usize {
        self.index
    }

    /// Returns the parent `Buffer`.
    pub fn buffer(&self) -> Buffer<'a> {
        self.document
            .buffers()
            .nth(self.json.buffer.value())
            .unwrap()
    }

    /// Returns the length of the buffer view in bytes.
    pub fn length(&self) -> usize {
        self.json.byte_length.0 as usize
    }

    /// Returns the offset into the parent buffer in bytes.
    pub fn offset(&self) -> usize {
        self.json.byte_offset.unwrap_or_default().0 as usize
    }

    /// Returns the stride in bytes between vertex attributes or other interleavable
    /// data. When `None`, data is assumed to be tightly packed.
    pub fn stride(&self) -> Option<usize> {
        self.json.byte_stride.and_then(|x| {
            // Treat byte_stride == 0 same as not specifying stride.
            // This is technically a validation error, but best way we can handle it here
            if x.0 == 0 {
                None
            } else {
                Some(x.0)
            }
        })
    }

    /// Optional user-defined name for this object.
    #[cfg(feature = "names")]
    #[cfg_attr(docsrs, doc(cfg(feature = "names")))]
    pub fn name(&self) -> Option<&'a str> {
        self.json.name.as_deref()
    }

    /// Optional target the buffer should be bound to.
    pub fn target(&self) -> Option<Target> {
        self.json.target.map(|target| target.unwrap())
    }

    /// Returns extension data unknown to this crate version.
    #[cfg(feature = "extensions")]
    #[cfg_attr(docsrs, doc(cfg(feature = "extensions")))]
    pub fn extensions(&self) -> Option<&Map<String, Value>> {
        let ext = self.json.extensions.as_ref()?;
        Some(&ext.others)
    }

    /// Queries extension data unknown to this crate version.
    #[cfg(feature = "extensions")]
    #[cfg_attr(docsrs, doc(cfg(feature = "extensions")))]
    pub fn extension_value(&self, ext_name: &str) -> Option<&Value> {
        let ext = self.json.extensions.as_ref()?;
        ext.others.get(ext_name)
    }

    /// Optional application specific data.
    pub fn extras(&self) -> &'a json::Extras {
        &self.json.extras
    }
}