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use VRPose;
use std::mem;
use std::ptr;
// Represents all the information needed to render a single frame of a VR scene
#[derive(Debug, Clone)]
#[cfg_attr(feature = "serde-serialization", derive(Deserialize, Serialize))]
pub struct VRFrameData {
// Monotonically increasing value that allows the author
// to determine if position state data been updated from the hardware
pub timestamp: f64,
// major order column matrix describing the projection to be used for the left eye’s rendering
pub left_projection_matrix: [f32; 16],
// major order column matrix describing the view transform to be used for the left eye’s rendering
pub left_view_matrix: [f32; 16],
// major order column matrix describing the projection to be used for the right eye’s rendering
pub right_projection_matrix: [f32; 16],
// major order column matrix describing the view transform to be used for the right eye’s rendering
pub right_view_matrix: [f32; 16],
// VRPose containing the future predicted pose of the VRDisplay
// when the current frame will be presented.
pub pose: VRPose,
}
impl Default for VRFrameData {
fn default() -> VRFrameData {
VRFrameData {
timestamp: 0f64,
left_projection_matrix: identity_matrix!(),
left_view_matrix: identity_matrix!(),
right_projection_matrix: identity_matrix!(),
right_view_matrix: identity_matrix!(),
pose: VRPose::default(),
}
}
}
impl VRFrameData {
pub fn to_bytes(&self) -> Vec<u8> {
let mut vec = vec![0u8; mem::size_of::<VRFrameData>()];
unsafe {
ptr::copy_nonoverlapping(mem::transmute(self),
vec.as_mut_ptr(),
mem::size_of::<VRFrameData>());
}
vec
}
pub fn from_bytes(bytes: &[u8]) -> VRFrameData {
unsafe {
let mut result: VRFrameData = mem::uninitialized();
ptr::copy_nonoverlapping(bytes.as_ptr(),
mem::transmute(&mut result),
mem::size_of::<VRFrameData>());
result
}
}
}