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use super::streaminginfo::StreamingInfo;
use crate::object::{Value, parser::FromValue};
use anyhow::{Result, anyhow, bail};
use glam::Mat4;
use serde::Serialize;
use std::mem::transmute;
#[derive(Debug, Serialize)]
pub struct Mesh {
pub name: String,
pub bind_pose: Vec<Mat4>,
pub bone_name_hashes: Vec<u32>,
pub index_format: i32,
pub index_buffer: Vec<u8>,
pub sub_meshes: Vec<SubMesh>,
pub stream_data: StreamingInfo,
pub vertex_data: VertexData,
}
#[derive(Debug, Serialize)]
pub struct SubMesh {
pub topology: i32,
pub vertex_count: u32,
pub base_vertex: u32,
pub first_byte: u32,
pub first_vertex: u32,
pub index_count: u32,
}
#[derive(Debug, Serialize)]
pub struct VertexData {
pub channels: Vec<ChannelInfo>,
pub data: Vec<u8>,
pub vertex_count: u32,
}
#[derive(Debug, Serialize)]
pub struct ChannelInfo {
pub dimension: u8,
pub format: VertexFormat,
pub offset: u8,
pub stream: u8,
}
impl FromValue for Mesh {
fn from_value(v: Value) -> Result<Self> {
let mut fields = v.as_class("Mesh")?;
Ok(Mesh {
name: fields.field("m_Name")?,
index_format: fields.field("m_IndexFormat")?,
vertex_data: fields.field("m_VertexData")?,
stream_data: fields.field("m_StreamData")?,
index_buffer: fields
.remove("m_IndexBuffer")
.unwrap()
.as_vector()
.unwrap()
.into_iter()
.map(|e| e.as_u8().unwrap())
.collect(),
sub_meshes: fields
.remove("m_SubMeshes")
.unwrap()
.as_vector()
.unwrap()
.into_iter()
.map(|e| e.parse().unwrap())
.collect(),
bind_pose: fields
.remove("m_BindPose")
.unwrap()
.as_vector()
.unwrap()
.into_iter()
.map(|e| e.parse().unwrap())
.collect(),
bone_name_hashes: fields
.remove("m_BoneNameHashes")
.unwrap()
.as_vector()
.unwrap()
.into_iter()
.map(|e| e.parse().unwrap())
.collect(),
})
}
}
impl Mesh {
pub fn read_indecies(&self) -> Vec<[u32; 3]> {
if self.index_format == 0 {
self.index_buffer
.array_chunks::<2>()
.map(|x| u16::from_le_bytes(*x) as u32)
.array_chunks()
.collect()
} else {
self.index_buffer
.array_chunks::<4>()
.map(|x| u32::from_le_bytes(*x))
.array_chunks()
.collect()
}
}
}
impl FromValue for VertexData {
fn from_value(v: Value) -> Result<Self> {
let mut fields = v.as_class("VertexData")?;
Ok(VertexData {
vertex_count: fields.field("m_VertexCount")?,
data: fields
.remove("m_DataSize")
.ok_or(anyhow!("m_DataSize missing"))?
.as_typeless()
.ok_or(anyhow!("m_DataSize is not typeless"))?,
channels: fields
.remove("m_Channels")
.unwrap()
.as_vector()
.unwrap()
.into_iter()
.map(|e| e.parse().unwrap())
.collect(),
})
}
}
impl VertexData {
/// Returns (offset, stride) for each stream.
pub fn stream_layout(&self) -> Vec<(usize, usize)> {
let stream_count = self.channels.iter().map(|c| c.stream).max().unwrap() + 1;
let mut streams = Vec::new();
let mut offset = 0;
for si in 0..stream_count {
let stride = self
.channels
.iter()
.filter(|c| c.stream == si)
// The modulo operator here is a hack to fix normal with 52 dimensions to 4
.map(|c| (c.dimension as usize % 48) * c.format.component_size())
.sum();
streams.push((offset, stride));
offset += stride * self.vertex_count as usize
}
streams
}
/// Reads a vertex channel and returns dimension count and data converted to floats
pub fn read_channel(&self, channel: VertexDataChannel) -> Option<(usize, Vec<f32>)> {
let channel = &self.channels[channel as u8 as usize];
if channel.dimension == 0 {
return None;
}
let component_offset = channel.offset as usize;
let component_size = channel.format.component_size();
let (offset, stride) = self.stream_layout()[channel.stream as usize];
let mut out = Vec::new();
for vi in 0..self.vertex_count as usize {
for di in 0..channel.dimension as usize {
let off = offset + vi * stride + component_offset + component_size * di;
let e = &self.data[off..];
out.push(match channel.format {
VertexFormat::Float => f32::from_le_bytes([e[0], e[1], e[2], e[3]]),
VertexFormat::Float16 => f16::from_le_bytes([e[0], e[1]]) as f32,
VertexFormat::SInt8 => i8::from_le_bytes([e[0]]) as f32,
VertexFormat::UInt8 => u8::from_le_bytes([e[0]]) as f32,
VertexFormat::SInt16 => i16::from_le_bytes([e[0], e[1]]) as f32,
VertexFormat::UInt16 => u16::from_le_bytes([e[0], e[1]]) as f32,
VertexFormat::SInt32 => i32::from_le_bytes([e[0], e[1], e[2], e[3]]) as f32,
VertexFormat::UInt32 => u32::from_le_bytes([e[0], e[1], e[2], e[3]]) as f32,
VertexFormat::UNorm8 => u8::from_le_bytes([e[0]]) as f32 / 256.,
VertexFormat::SNorm8 => i8::from_le_bytes([e[0]]) as f32 / 128.,
VertexFormat::UNorm16 => u16::from_le_bytes([e[0], e[1]]) as f32 / 65536.,
VertexFormat::SNorm16 => i16::from_le_bytes([e[0], e[1]]) as f32 / 32768.,
})
}
}
Some((channel.dimension as usize, out))
}
}
impl FromValue for ChannelInfo {
fn from_value(v: Value) -> Result<Self> {
let mut fields = v.as_class("ChannelInfo")?;
Ok(ChannelInfo {
dimension: fields.field("dimension")?,
format: fields.field("format")?,
offset: fields.field("offset")?,
stream: fields.field("stream")?,
})
}
}
impl FromValue for SubMesh {
fn from_value(v: Value) -> Result<Self> {
let mut fields = v.as_class("SubMesh")?;
Ok(SubMesh {
topology: fields.field("topology")?,
vertex_count: fields.field("vertexCount")?,
base_vertex: fields.field("baseVertex")?,
first_byte: fields.field("firstByte")?,
first_vertex: fields.field("firstVertex")?,
index_count: fields.field("indexCount")?,
})
}
}
#[repr(u8)]
#[derive(Debug, Serialize, Clone, Copy, PartialEq)]
pub enum VertexDataChannel {
Position,
Normal,
Tangent,
Color,
TexCoord0,
TexCoord1,
TexCoord2,
TexCoord3,
TexCoord4,
TexCoord5,
TexCoord6,
TexCoord7,
BlendWeight,
BlendIndices,
}
#[repr(u8)]
#[derive(Debug, Serialize, Clone, Copy, PartialEq)]
pub enum VertexFormat {
Float,
Float16,
UNorm8,
SNorm8,
UNorm16,
SNorm16,
UInt8,
SInt8,
UInt16,
SInt16,
UInt32,
SInt32,
}
impl FromValue for VertexFormat {
fn from_value(v: Value) -> Result<Self> {
let x = v.as_u8().ok_or(anyhow!("expected u8 vertex format"))?;
if x < 12 {
Ok(unsafe { transmute(x) })
} else {
bail!("unknown vertex format")
}
}
}
impl VertexFormat {
pub fn component_size(&self) -> usize {
use VertexFormat::*;
match self {
Float | UInt32 | SInt32 => 4,
Float16 | UInt16 | SInt16 | UNorm16 | SNorm16 => 2,
UInt8 | SInt8 | UNorm8 | SNorm8 => 1,
}
}
}
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