773 lines
25 KiB
Rust
773 lines
25 KiB
Rust
use crate::tokenizer::Tokenizer;
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use error::SourceFile;
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use miette::{Diagnostic, IntoDiagnostic, Result, SourceSpan, bail, miette};
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use ray_tracing_core::{
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affine_transform::AffineTransform,
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math::{Dir3, Pos3},
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prelude::Float,
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};
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use std::{
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collections::HashMap,
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path::{Path, PathBuf},
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sync::Arc,
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};
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use texture::PbrtTexture;
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use thiserror::Error;
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#[macro_use]
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mod tokenizer;
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mod error;
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mod texture;
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struct Lexer {
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input: Tokenizer,
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}
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impl Lexer {
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fn new(path: impl AsRef<Path>) -> Result<Self> {
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Ok(Self {
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input: Tokenizer::new(path)?,
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})
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}
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}
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#[derive(Debug)]
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enum CameraType {
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Orthographic {
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frame_aspect_ratio: Option<Float>,
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screen_window: Option<Float>,
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lens_radius: Float,
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focal_distance: Float,
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},
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Perspective {
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frame_aspect_ratio: Option<Float>,
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screen_window: Option<Float>,
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lens_radius: Float,
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focal_distance: Float,
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fov: Float,
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},
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}
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#[derive(Debug)]
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struct PbrtCamera {
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camera_type: CameraType,
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shutter_open: Float,
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shutter_close: Float,
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}
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#[derive(Debug)]
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enum Statement {
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AttributeBegin,
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AttributeEnd,
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WorldBegin,
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Camera(PbrtCamera),
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Include(String),
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ConcatTransform(AffineTransform),
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CoordinateSystem(String),
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CoordSysTransform(String),
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Shape(ShapeType, ShapeAlpha),
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Unknown(String, Vec<String>),
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Transform(AffineTransform),
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Texture(String, Arc<dyn PbrtTexture>),
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}
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fn parse_look_at(iter: &mut Tokenizer) -> Result<Statement> {
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let eye = Pos3::new(iter.parse_next()?, iter.parse_next()?, iter.parse_next()?);
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let look_at = Pos3::new(iter.parse_next()?, iter.parse_next()?, iter.parse_next()?);
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let up = Dir3::new(iter.parse_next()?, iter.parse_next()?, iter.parse_next()?);
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Ok(Statement::ConcatTransform(
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AffineTransform::look_at(eye, look_at, up)
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.ok_or(miette!("Unable to calculate inverse of matrix"))?,
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))
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}
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fn parse_shape(iter: &mut Tokenizer) -> Result<Statement> {
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let shape_type = iter.next().ok_or(miette!("unable to get shape type"))??;
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match shape_type.as_str() {
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"\"sphere\"" => {
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let t = parse_dict!(iter =>
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radius, Float, 1.0;
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zmin, Float, {-radius};
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zmax, Float, {radius};
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phimax, Float, 360.0;
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alpha, ShapeAlpha, ShapeAlpha::None
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=>
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radius, "\"float radius\"", iter.parse_parameter()?;
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zmin, "\"float zmin\"", iter.parse_parameter()?;
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zmax, "\"float zmax\"", iter.parse_parameter()?;
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phimax, "\"float phimax\"", iter.parse_parameter()?;
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alpha, "\"float alpha\"", ShapeAlpha::Value(iter.parse_parameter()?);
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alpha, "\"texture alpha\"", ShapeAlpha::Texture(iter.parse_parameter()?)
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);
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Ok(Statement::Shape(
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ShapeType::Sphere {
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radius: t.radius,
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zmin: t.zmin,
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zmax: t.zmax,
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phimax: t.phimax,
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},
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t.alpha,
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))
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}
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"\"trianglemesh\"" => {
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let t = parse_dict!(iter =>
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p, Vec<Pos3>, Vec::new();
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n, Vec<Dir3>, Vec::new();
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s, Vec<Dir3>, Vec::new();
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uv, Vec<[Float; 2]>, Vec::new();
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indices, Vec<usize>, Vec::new();
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alpha, ShapeAlpha, ShapeAlpha::None
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=>
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p, "\"point3 P\"", iter.parse_list_3(Pos3::new)?;
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n, "\"normal N\"", iter.parse_list_3(Dir3::new)?;
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s, "\"normal S\"", iter.parse_list_3(Dir3::new)?;
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uv, "\"point2 uv\"", iter.parse_list_2(|u, v| [u, v])?;
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indices, "\"integer indices\"", iter.parse_list()?;
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alpha, "\"float alpha\"", ShapeAlpha::Value(iter.parse_parameter()?);
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alpha, "\"texture alpha\"", ShapeAlpha::Texture(iter.parse_parameter()?)
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);
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if t.p.len() < 3 {
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bail!("At least 3 points required.")
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}
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if t.indices.is_empty() && t.p.len() != 3 {
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bail!("Indices required for trianglemesh with more than 3 points.")
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}
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if t.indices.len() % 3 != 0 {
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bail!(
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"number of indices must be divisible by 3. num indices: {}",
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t.indices.len()
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)
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}
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if !t.n.is_empty() && t.n.len() != t.p.len() {
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bail!("Number of normals not equal to number of positions.")
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}
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if !t.s.is_empty() && t.s.len() != t.p.len() {
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bail!("Number of tangents not equal to number of positions.")
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}
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if !t.uv.is_empty() && t.uv.len() != t.p.len() {
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bail!("Number of uvs not equal to number of positions.")
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}
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Ok(Statement::Shape(
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ShapeType::TriangleMesh {
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indices: t.indices,
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p: t.p,
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n: t.n,
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s: t.s,
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uv: t.uv,
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},
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t.alpha,
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))
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}
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"\"bilinearmesh\"" => {
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let t = parse_dict!(iter =>
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p, Vec<Pos3>, Vec::new();
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n, Vec<Dir3>, Vec::new();
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uv, Vec<[Float; 2]>, Vec::new();
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indices, Vec<usize>, Vec::new();
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alpha, ShapeAlpha, ShapeAlpha::None
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=>
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p, "\"point3 P\"", iter.parse_list_3(Pos3::new)?;
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n, "\"normal N\"", iter.parse_list_3(Dir3::new)?;
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uv, "\"point2 uv\"", iter.parse_list_2(|u, v| [u, v])?;
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indices, "\"integer indices\"", iter.parse_list()?;
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alpha, "\"float alpha\"", ShapeAlpha::Value(iter.parse_parameter()?);
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alpha, "\"texture alpha\"", ShapeAlpha::Texture(iter.parse_parameter()?)
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);
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if t.p.len() < 4 {
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bail!("At least 4 points required.")
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}
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if t.indices.is_empty() && t.p.len() != 4 {
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bail!("Indices required for trianglemesh with more than 4 points.")
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}
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if t.indices.len() % 4 != 0 {
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bail!(
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"number of indices must be divisible by 4. num indices: {}",
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t.indices.len()
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)
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}
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if !t.n.is_empty() && t.n.len() != t.p.len() {
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bail!("Number of normals not equal to number of positions.")
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}
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if !t.uv.is_empty() && t.uv.len() != t.p.len() {
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bail!("Number of uvs not equal to number of positions.")
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}
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Ok(Statement::Shape(
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ShapeType::BilinearMesh {
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indices: t.indices,
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p: t.p,
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n: t.n,
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uv: t.uv,
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},
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t.alpha,
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))
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}
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"\"loopsubdiv\"" => {
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let t = parse_dict!(iter =>
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levels, u32, 3;
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indices, Vec<usize>, Vec::new();
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p, Vec<Pos3>, Vec::new();
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alpha, ShapeAlpha, ShapeAlpha::None
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=>
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levels, "\"integer levels\"", iter.parse_parameter()?;
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indices, "\"integer indices\"", iter.parse_list()?;
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p, "\"point3 P\"", iter.parse_list_3(Pos3::new)?;
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alpha, "\"float alpha\"", ShapeAlpha::Value(iter.parse_parameter()?);
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alpha, "\"texture alpha\"", ShapeAlpha::Texture(iter.parse_parameter()?)
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);
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if t.indices.is_empty() {
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bail!("indices are a required field")
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}
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if t.p.is_empty() {
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bail!("p is a required field")
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}
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Ok(Statement::Shape(
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ShapeType::LoopSubDiv {
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levels: t.levels,
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indices: t.indices,
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p: t.p,
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},
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t.alpha,
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))
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}
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"\"disk\"" => {
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let t = parse_dict!(iter =>
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height, Float, 0.0;
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radius, Float, 1.0;
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innerradius, Float, 0.0;
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phimax, Float, 360.0;
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alpha, ShapeAlpha, ShapeAlpha::None
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=>
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height, "\"float height\"", iter.parse_parameter()?;
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radius, "\"float radius\"", iter.parse_parameter()?;
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innerradius, "\"float innerradius\"", iter.parse_parameter()?;
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phimax, "\"float phimax\"", iter.parse_parameter()?;
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alpha, "\"float alpha\"", ShapeAlpha::Value(iter.parse_parameter()?);
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alpha, "\"texture alpha\"", ShapeAlpha::Texture(iter.parse_parameter()?)
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);
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Ok(Statement::Shape(
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ShapeType::Disk {
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height: t.height,
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radius: t.radius,
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innerradius: t.innerradius,
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phimax: t.phimax,
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},
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t.alpha,
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))
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}
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"\"plymesh\"" => {
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let t = parse_dict!(iter =>
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filename, String, String::new();
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displacement, Option<String>, None;
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edgelength, Float, 1.0;
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alpha, ShapeAlpha, ShapeAlpha::None
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=>
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filename, "\"string filename\"", iter.parse_parameter()?;
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displacement, "\"string displacement\"", Some(iter.parse_parameter()?);
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edgelength, "\"float edgelength\"", iter.parse_parameter()?;
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alpha, "\"float alpha\"", ShapeAlpha::Value(iter.parse_parameter()?);
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alpha, "\"texture alpha\"", ShapeAlpha::Texture(iter.parse_parameter()?)
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);
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Ok(Statement::Shape(
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ShapeType::PlyMesh {
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filename: t.filename,
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displacement: t.displacement,
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edgelength: t.edgelength,
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},
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t.alpha,
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))
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}
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_ => Err(miette!("Unknown shape {}", shape_type)),
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}
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}
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fn parse_camera(tokenizer: &mut Tokenizer) -> Result<Statement> {
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let camera_type = tokenizer
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.next()
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.ok_or(miette!("unable to get shape type"))??;
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match camera_type.as_str() {
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"\"orthographic\"" => {
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let t = parse_dict!(tokenizer =>
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shutteropen, Float, 0.0;
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shutterclose, Float, 1.0;
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frame_aspect_ratio, Option<Float>, None;
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screen_window, Option<Float>, None;
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lens_radius, Float, 0.0;
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focal_distance, Float, Float::powi(10.0, 30)
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=>
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shutteropen, "\"float shutteropen\"", tokenizer.parse_parameter()?;
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shutterclose, "\"float shutterclose\"", tokenizer.parse_parameter()?;
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frame_aspect_ratio, "\"float frameaspectratio\"", Some(tokenizer.parse_parameter()?);
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screen_window, "\"float screenwindow\"", Some(tokenizer.parse_parameter()?);
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lens_radius, "\"float lensradius\"", tokenizer.parse_parameter()?;
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focal_distance, "\"float focaldistance\"", tokenizer.parse_parameter()?
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);
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Ok(Statement::Camera(PbrtCamera {
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camera_type: CameraType::Orthographic {
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frame_aspect_ratio: t.frame_aspect_ratio,
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screen_window: t.screen_window,
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lens_radius: t.lens_radius,
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focal_distance: t.focal_distance,
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},
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shutter_open: t.shutteropen,
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shutter_close: t.shutterclose,
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}))
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}
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"\"perspective\"" => {
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let t = parse_dict!(tokenizer =>
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shutteropen, Float, 0.0;
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shutterclose, Float, 1.0;
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frame_aspect_ratio, Option<Float>, None;
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screen_window, Option<Float>, None;
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lens_radius, Float, 0.0;
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focal_distance, Float, Float::powi(10.0, 30);
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fov, Float, 90.0
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=>
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shutteropen, "\"float shutteropen\"", tokenizer.parse_parameter()?;
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shutterclose, "\"float shutterclose\"", tokenizer.parse_parameter()?;
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frame_aspect_ratio, "\"float frameaspectratio\"", Some(tokenizer.parse_parameter()?);
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screen_window, "\"float screenwindow\"", Some(tokenizer.parse_parameter()?);
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lens_radius, "\"float lensradius\"", tokenizer.parse_parameter()?;
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focal_distance, "\"float focaldistance\"", tokenizer.parse_parameter()?;
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fov, "\"float fov\"", tokenizer.parse_parameter()?
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);
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Ok(Statement::Camera(PbrtCamera {
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camera_type: CameraType::Perspective {
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frame_aspect_ratio: t.frame_aspect_ratio,
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screen_window: t.screen_window,
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lens_radius: t.lens_radius,
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focal_distance: t.focal_distance,
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fov: t.fov,
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},
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shutter_open: t.shutteropen,
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shutter_close: t.shutterclose,
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}))
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}
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_ => Err(miette!("Unknown camera_type {}", camera_type)),
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}
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}
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impl Lexer {
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fn next(
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&mut self,
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textures: &HashMap<String, Arc<dyn PbrtTexture>>,
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) -> Option<Result<Statement>> {
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match self.input.next() {
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Some(Ok(s)) => match s.as_str() {
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"AttributeBegin" => Some(Ok(Statement::AttributeBegin)),
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"AttributeEnd" => Some(Ok(Statement::AttributeEnd)),
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"Include" => {
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let s = self
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.input
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.next()
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.unwrap()
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.unwrap()
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.trim_matches('"')
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.to_string();
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Some(Ok(Statement::Include(s)))
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}
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"Camera" => Some(parse_camera(&mut self.input)),
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"LookAt" => Some(parse_look_at(&mut self.input)),
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"Identity" => Some(Ok(Statement::ConcatTransform(AffineTransform::identity()))),
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"Translate" => Some(parse_translate(&mut self.input)),
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"Scale" => Some(parse_scale(&mut self.input)),
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"Shape" => Some(parse_shape(&mut self.input)),
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"Rotate" => Some(parse_rotate(&mut self.input)),
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"Transform" => Some(parse_transform(&mut self.input).map(Statement::Transform)),
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"Texture" => Some(
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texture::parse_texture(&mut self.input)
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.map(|(name, texture)| Statement::Texture(name, texture)),
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),
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"ConcatTransform" => {
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Some(parse_transform(&mut self.input).map(Statement::ConcatTransform))
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}
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"CoordinateSystem" => Some(match self.input.parse_parameter() {
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Ok(s) => Ok(Statement::CoordinateSystem(s)),
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Err(e) => Err(e),
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}),
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"CoordSysTransform" => Some(match self.input.parse_parameter() {
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Ok(s) => Ok(Statement::CoordSysTransform(s)),
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Err(e) => Err(e),
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}),
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"WorldBegin" => Some(Ok(Statement::WorldBegin)),
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_ => {
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if s.chars().any(|c| !c.is_ascii_alphabetic()) {
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Some(Err(miette!("malformed identifier")))
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} else {
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let mut v = Vec::new();
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while let Some(p) = self
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.input
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.next_if(|s| !s.starts_with(|c: char| c.is_ascii_alphabetic()))
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{
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match p {
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Ok(c) => v.push(c),
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Err(e) => return Some(Err(e)),
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}
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}
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Some(Ok(Statement::Unknown(s, v)))
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}
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}
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},
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Some(Err(e)) => Some(Err(e)),
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None => None,
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}
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}
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}
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fn parse_transform(input: &mut Tokenizer) -> Result<AffineTransform> {
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if !input
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.next()
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.is_none_or(|p| p.is_ok_and(|p| p.as_str() == "["))
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{
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bail!("expected list.")
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}
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let mut v = [0.0; 16];
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for i in 0..16 {
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v[i] = input
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.next()
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.ok_or(miette!("value expected"))??
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.parse::<Float>()
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.into_diagnostic()?;
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}
|
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if !input
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.next()
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.is_none_or(|p| p.is_ok_and(|p| p.as_str() == "]"))
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{
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bail!("expected list end.")
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}
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if v[3] != 0.0 || v[7] != 0.0 || v[11] != 0.0 || v[15] != 1.0 {
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bail!("invalid transform entry")
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}
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AffineTransform::new([
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[v[0], v[4], v[8], v[12]],
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[v[1], v[5], v[9], v[13]],
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[v[2], v[6], v[10], v[14]],
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])
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.ok_or(miette!("Unable to invert transformation"))
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}
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fn parse_translate(iter: &mut Tokenizer) -> Result<Statement> {
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let pos = Pos3::new(iter.parse_next()?, iter.parse_next()?, iter.parse_next()?);
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Ok(Statement::ConcatTransform(AffineTransform::translation(
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pos,
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)))
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}
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fn parse_scale(iter: &mut Tokenizer) -> Result<Statement> {
|
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Ok(Statement::ConcatTransform(AffineTransform::scale(
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iter.parse_next()?,
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iter.parse_next()?,
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iter.parse_next()?,
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)))
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}
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fn parse_rotate(iter: &mut Tokenizer) -> Result<Statement> {
|
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let angle = iter
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.next()
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.ok_or(miette!("missing argument"))??
|
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.parse()
|
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.into_diagnostic()?;
|
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let dir = Dir3::new(
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iter.next()
|
|
.ok_or(miette!("missing argument"))??
|
|
.parse()
|
|
.into_diagnostic()?,
|
|
iter.next()
|
|
.ok_or(miette!("missing argument"))??
|
|
.parse()
|
|
.into_diagnostic()?,
|
|
iter.next()
|
|
.ok_or(miette!("missing argument"))??
|
|
.parse()
|
|
.into_diagnostic()?,
|
|
);
|
|
|
|
Ok(Statement::ConcatTransform(AffineTransform::rotation(
|
|
angle, dir,
|
|
)))
|
|
}
|
|
struct BytesToChar<I> {
|
|
count: usize,
|
|
iter: I,
|
|
}
|
|
|
|
impl<I> BytesToChar<I> {
|
|
fn new(iter: I) -> Self {
|
|
Self { count: 0, iter }
|
|
}
|
|
}
|
|
|
|
impl<I: Iterator<Item = Result<u8, std::io::Error>>> Iterator for BytesToChar<I> {
|
|
type Item = Result<(usize, char)>;
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
match self.iter.next()? {
|
|
Ok(a) => {
|
|
self.count += 1;
|
|
if a & 0x80 == 0 {
|
|
Some(Ok((self.count - 1, char::from(a))))
|
|
} else {
|
|
todo!()
|
|
}
|
|
}
|
|
Err(e) => Some(Err(e).into_diagnostic()),
|
|
}
|
|
}
|
|
}
|
|
|
|
struct Parser<P> {
|
|
path: P,
|
|
inner: Option<Box<Parser<PathBuf>>>,
|
|
iter: Lexer,
|
|
}
|
|
|
|
impl<P: AsRef<Path> + std::fmt::Debug> Parser<P> {
|
|
fn new(path: P) -> Result<Self> {
|
|
Ok(Self {
|
|
iter: Lexer::new(path.as_ref())?,
|
|
path,
|
|
inner: None,
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<P: AsRef<Path>> Parser<P> {
|
|
fn next(
|
|
&mut self,
|
|
textures: &HashMap<String, Arc<dyn PbrtTexture>>,
|
|
) -> Option<Result<Statement>> {
|
|
if let Some(iter) = &mut self.inner {
|
|
if let Some(statement) = iter.next(textures) {
|
|
return Some(statement);
|
|
}
|
|
self.inner = None;
|
|
}
|
|
|
|
match self.iter.next(textures) {
|
|
Some(Ok(Statement::Include(s))) => {
|
|
let path = self.path.as_ref().parent().unwrap().join(s);
|
|
self.inner = Some(Box::new(Parser::new(path).unwrap()));
|
|
|
|
self.next(textures)
|
|
}
|
|
Some(s) => Some(s),
|
|
None => None,
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
enum ShapeType {
|
|
Sphere {
|
|
radius: Float,
|
|
zmin: Float,
|
|
zmax: Float,
|
|
phimax: Float,
|
|
},
|
|
TriangleMesh {
|
|
indices: Vec<usize>,
|
|
p: Vec<Pos3>,
|
|
n: Vec<Dir3>,
|
|
s: Vec<Dir3>,
|
|
uv: Vec<[Float; 2]>,
|
|
},
|
|
BilinearMesh {
|
|
indices: Vec<usize>,
|
|
p: Vec<Pos3>,
|
|
n: Vec<Dir3>,
|
|
uv: Vec<[Float; 2]>,
|
|
},
|
|
LoopSubDiv {
|
|
levels: u32,
|
|
indices: Vec<usize>,
|
|
p: Vec<Pos3>,
|
|
},
|
|
Disk {
|
|
height: Float,
|
|
radius: Float,
|
|
innerradius: Float,
|
|
phimax: Float,
|
|
},
|
|
PlyMesh {
|
|
filename: String,
|
|
displacement: Option<String>,
|
|
edgelength: Float,
|
|
},
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
enum ShapeAlpha {
|
|
None,
|
|
Value(Float),
|
|
Texture(String),
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct Shape {
|
|
ctm: AffineTransform,
|
|
material: usize,
|
|
obj: ShapeType,
|
|
alpha: ShapeAlpha,
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
pub struct Pbrt {
|
|
settings: PbrtWorldSettings,
|
|
scene: PbrtScene,
|
|
}
|
|
|
|
impl Pbrt {
|
|
fn new(settings: PbrtWorldSettings) -> Self {
|
|
Self {
|
|
settings,
|
|
scene: PbrtScene { shapes: Vec::new() },
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct PbrtWorldSettings {
|
|
camera: PbrtCamera,
|
|
camera_ctm: AffineTransform,
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct PbrtScene {
|
|
shapes: Vec<Shape>,
|
|
}
|
|
|
|
fn inner_parse_pbrt(path: impl AsRef<Path> + std::fmt::Debug) -> Result<Pbrt> {
|
|
// unwrap on context.last() ok because context is never empty
|
|
let mut context_ctm = vec![AffineTransform::identity()];
|
|
|
|
let mut parser = Parser::new(path)?;
|
|
|
|
// parse global settings
|
|
|
|
let mut camera = None;
|
|
|
|
let mut named_transforms = HashMap::new();
|
|
|
|
let mut textures = HashMap::new();
|
|
|
|
loop {
|
|
let p = parser.next(&textures).ok_or_else(|| miette!(""))??;
|
|
// dbg!(&p);
|
|
match p {
|
|
Statement::AttributeBegin => context_ctm.push(*context_ctm.last().unwrap()),
|
|
Statement::AttributeEnd => {
|
|
context_ctm.pop();
|
|
if context_ctm.is_empty() {
|
|
return Err(miette!("Attribute end does not match."));
|
|
}
|
|
}
|
|
Statement::Include(_) => unreachable!(),
|
|
Statement::ConcatTransform(affine_transform) => {
|
|
*context_ctm.last_mut().unwrap() *= affine_transform
|
|
}
|
|
Statement::Transform(affine_transform) => {
|
|
*context_ctm.last_mut().unwrap() = affine_transform
|
|
}
|
|
Statement::Unknown(s, _items) => {
|
|
eprintln!("Unknown statement: {s}")
|
|
}
|
|
Statement::Camera(c) => {
|
|
if camera.is_some() {
|
|
return Err(miette!("The camera can only be set once."));
|
|
}
|
|
camera = Some((c, *context_ctm.last().unwrap()));
|
|
named_transforms.insert(String::from("\"camera\""), *context_ctm.last().unwrap());
|
|
}
|
|
Statement::CoordinateSystem(s) => {
|
|
named_transforms.insert(s, *context_ctm.last().unwrap());
|
|
}
|
|
Statement::CoordSysTransform(s) => {
|
|
*context_ctm.last_mut().unwrap() = *named_transforms
|
|
.get(&s)
|
|
.ok_or_else(|| miette!("unknown transform"))?;
|
|
}
|
|
Statement::WorldBegin => break,
|
|
s => bail!("unexpected statemnet in global settings: {s:?}"),
|
|
}
|
|
}
|
|
|
|
let (camera, camera_ctm) = camera.ok_or(miette!("A camera has to be specified"))?;
|
|
|
|
let mut pbrt = Pbrt::new(PbrtWorldSettings { camera, camera_ctm });
|
|
|
|
let mut context_ctm = vec![AffineTransform::identity()];
|
|
|
|
// let mut context_material = vec![];
|
|
|
|
while let Some(p) = parser.next(&textures).transpose()? {
|
|
match p {
|
|
Statement::AttributeBegin => context_ctm.push(*context_ctm.last().unwrap()),
|
|
Statement::AttributeEnd => {
|
|
context_ctm.pop();
|
|
}
|
|
Statement::Include(_) => unreachable!(),
|
|
Statement::ConcatTransform(affine_transform) => {
|
|
*context_ctm.last_mut().unwrap() *= affine_transform
|
|
}
|
|
Statement::Transform(affine_transform) => {
|
|
*context_ctm.last_mut().unwrap() = affine_transform
|
|
}
|
|
Statement::Shape(shape_type, shape_alpha) => {
|
|
pbrt.scene.shapes.push(Shape {
|
|
ctm: *context_ctm.last().unwrap(),
|
|
material: 0,
|
|
obj: shape_type,
|
|
alpha: shape_alpha,
|
|
});
|
|
}
|
|
Statement::CoordinateSystem(s) => {
|
|
named_transforms.insert(s, *context_ctm.last().unwrap());
|
|
}
|
|
Statement::CoordSysTransform(s) => {
|
|
*context_ctm.last_mut().unwrap() = *named_transforms
|
|
.get(&s)
|
|
.ok_or_else(|| miette!("unknown transform"))?;
|
|
}
|
|
Statement::Unknown(s, _items) => {
|
|
eprintln!("Unknown statement: {s}")
|
|
}
|
|
s => bail!("unexpected statemnet in world settings: {s:?}"),
|
|
}
|
|
}
|
|
|
|
Ok(pbrt)
|
|
}
|
|
|
|
pub fn parse_pbrt_v4(path: impl AsRef<Path> + std::fmt::Debug) -> Result<Pbrt> {
|
|
inner_parse_pbrt(path)
|
|
}
|