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#[cfg(feature = "import")]
use std::ops;
use crate::Document;
pub use json::buffer::Target;
/// 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 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()
}
/// 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 as usize
}
/// Returns the offset into the parent buffer in bytes.
pub fn offset(&self) -> usize {
self.json.byte_offset.unwrap_or(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 {
None
} else {
Some(x 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()
}
/// Optional target the buffer should be bound to.
pub fn target(&self) -> Option<Target> {
self.json.target.map(|target| target.unwrap())
}
/// Optional application specific data.
pub fn extras(&self) -> &'a json::Extras {
&self.json.extras
}
}