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
|
use std::collections::hash_map::DefaultHasher;
use std::fs::read_to_string;
use std::hash::{Hash, Hasher};
use std::path::{Path, PathBuf};
use crate::shader_preprocessor::{Error as ShaderPreprocessorError, ShaderPreprocessor};
/// Shader program
#[derive(Debug, Clone, PartialEq, Eq, Hash, Default)]
pub struct Program
{
shaders: Vec<Shader>,
}
impl Program
{
#[must_use]
pub fn new() -> Self
{
Self { shaders: Vec::new() }
}
pub fn push_shader(&mut self, shader: Shader)
{
self.shaders.push(shader);
}
pub fn append_shaders(&mut self, shaders: impl IntoIterator<Item = Shader>)
{
self.shaders.extend(shaders);
}
#[must_use]
pub fn shaders(&self) -> &[Shader]
{
&self.shaders
}
pub(crate) fn u64_hash(&self) -> u64
{
let mut hasher = DefaultHasher::new();
self.hash(&mut hasher);
hasher.finish()
}
}
#[derive(Debug, Clone, Hash, PartialEq, Eq)]
pub struct Shader
{
kind: Kind,
source: String,
file: PathBuf,
}
impl Shader
{
/// Reads a shader from the specified source file.
///
/// # Errors
/// Will return `Err` if:
/// - Reading the file fails
/// - The shader source is not ASCII
pub fn read_shader_file(kind: Kind, shader_file: &Path) -> Result<Self, Error>
{
let source = read_to_string(shader_file).map_err(|err| Error::ReadFailed {
source: err,
shader_file: shader_file.to_path_buf(),
})?;
if !source.is_ascii() {
return Err(Error::SourceNotAscii);
}
Ok(Self {
kind,
source,
file: shader_file.to_path_buf(),
})
}
/// Preprocesses the shaders.
///
/// # Errors
/// Returns `Err` if preprocessing fails.
pub fn preprocess(self) -> Result<Self, Error>
{
let shader_preprocessor = ShaderPreprocessor::new(
self.file
.parent()
.ok_or(Error::SourcePathHasNoParent)?
.to_path_buf(),
);
let source_preprocessed = shader_preprocessor
.preprocess(self.source, &self.file)
.map_err(|err| Error::PreprocessFailed {
source: err,
shader_file: self.file.clone(),
})?;
Ok(Self {
kind: self.kind,
source: source_preprocessed,
file: self.file.clone(),
})
}
#[must_use]
pub fn kind(&self) -> Kind
{
self.kind
}
#[must_use]
pub fn source(&self) -> &str
{
&self.source
}
}
/// Shader kind.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum Kind
{
Vertex,
Fragment,
}
/// Shader error
#[derive(Debug, thiserror::Error)]
pub enum Error
{
#[error("Failed to read shader {}", shader_file.display())]
ReadFailed
{
#[source]
source: std::io::Error,
shader_file: PathBuf,
},
#[error("Shader source is not ASCII")]
SourceNotAscii,
#[error("Failed to preprocess shader {}", shader_file.display())]
PreprocessFailed
{
#[source]
source: ShaderPreprocessorError,
shader_file: PathBuf,
},
#[error("Shader source path has no parent")]
SourcePathHasNoParent,
}
|
