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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
use std::collections::HashMap;
use std::path::Path;
use crate::material::Material;
use crate::mesh::Mesh;
use crate::shader::{
Error as ShaderError,
Kind as ShaderKind,
Program as ShaderProgram,
Shader,
};
use crate::texture::{Id as TextureId, Texture};
use crate::transform::Transform;
use crate::vector::Vec3;
use crate::vertex::Vertex;
const VERTEX_SHADER_FILE: &str = "vertex.glsl";
const FRAGMENT_SHADER_FILE: &str = "fragment.glsl";
const SHADER_DIR: &str = "engine";
#[derive(Debug)]
pub struct Object
{
id: Id,
mesh: Mesh,
shader: ShaderProgram,
transform: Transform,
textures: HashMap<TextureId, Texture>,
material: Material,
}
impl Object
{
/// Returns the object ID.
#[must_use]
pub fn id(&self) -> Id
{
self.id
}
#[must_use]
pub fn position(&self) -> &Vec3<f32>
{
self.transform.position()
}
pub fn translate(&mut self, translation: Vec3<f32>)
{
self.transform
.set_position(self.transform.position().clone() + translation);
}
pub fn scale(&mut self, scaling: Vec3<f32>)
{
self.transform.set_scale(scaling);
}
pub fn textures(&self) -> impl Iterator<Item = (&TextureId, &Texture)>
{
self.textures.iter()
}
#[must_use]
pub fn material(&self) -> &Material
{
&self.material
}
#[must_use]
pub fn mesh(&self) -> &Mesh
{
&self.mesh
}
#[must_use]
pub fn shader(&self) -> &ShaderProgram
{
&self.shader
}
pub(crate) fn transform(&self) -> &Transform
{
&self.transform
}
}
/// Object builder.
#[derive(Debug)]
pub struct Builder
{
vertices: Vec<Vertex>,
indices: Option<Vec<u32>>,
textures: HashMap<TextureId, Texture>,
material: Option<Material>,
}
impl Builder
{
/// Returns a new [`Object`] builder.
#[must_use]
pub fn new() -> Self
{
Self {
vertices: Vec::new(),
indices: None,
textures: HashMap::new(),
material: None,
}
}
#[must_use]
pub fn vertices(mut self, vertices: impl IntoIterator<Item = Vertex>) -> Self
{
self.vertices = vertices.into_iter().collect();
self
}
#[must_use]
pub fn indices(mut self, indices: impl IntoIterator<Item = u32>) -> Self
{
self.indices = Some(indices.into_iter().collect());
self
}
#[must_use]
pub fn texture(mut self, id: TextureId, texture: Texture) -> Self
{
self.textures.insert(id, texture);
self
}
#[must_use]
pub fn textures<Textures>(mut self, textures: Textures) -> Self
where
Textures: IntoIterator<Item = (TextureId, Texture)>,
{
self.textures.extend(textures);
self
}
#[must_use]
pub fn material(mut self, material: Material) -> Self
{
self.material = Some(material);
self
}
/// Builds a new [`Object`].
///
/// # Errors
/// Will return `Err` if:
/// - Creating shaders fails
/// - Linking the shader program fails
pub fn build(self, id: Id) -> Result<Object, Error>
{
let mut shader_program = ShaderProgram::new();
shader_program.push_shader(
Shader::read_shader_file(
ShaderKind::Vertex,
&Path::new(SHADER_DIR).join(VERTEX_SHADER_FILE),
)?
.preprocess()?,
);
shader_program.push_shader(
Shader::read_shader_file(
ShaderKind::Fragment,
&Path::new(SHADER_DIR).join(FRAGMENT_SHADER_FILE),
)?
.preprocess()?,
);
let mesh = Mesh::new(self.vertices, self.indices);
let transform = Transform::new();
Ok(Object {
id,
mesh,
shader: shader_program,
transform,
textures: self.textures,
material: self.material.ok_or(Error::NoMaterial)?,
})
}
}
impl Default for Builder
{
fn default() -> Self
{
Self::new()
}
}
/// Object error
#[derive(Debug, thiserror::Error)]
pub enum Error
{
#[error(transparent)]
ShaderError(#[from] ShaderError),
#[error("Object builder has no material")]
NoMaterial,
}
/// Object ID.
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Id
{
id: u16,
}
impl Id
{
/// Returns a new object ID.
#[must_use]
pub fn new(id: u16) -> Self
{
Self { id }
}
}
|
