minwebgpu 0.2.0

Minimal WebGPU toolkit for modern graphics programming with compute shaders and rendering pipelines
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

/// Internal namespace.
mod private
{
  use crate::*;

  /// A builder for creating a `web_sys::GpuVertexAttribute`.
  #[ derive( Clone ) ]
  pub struct VertexAttribute
  {
    /// Offset of the attribute. Default: 0.0
    offset : f64,
    /// Location in the shader. Default: 0
    location : u32,
    /// Attribute's format. Default: Float32x3
    format : GpuVertexFormat
  }

  impl VertexAttribute 
  {
    /// Creates a new `VertexAttribute` with default values.
    pub fn new() -> Self
    {
      let offset = 0.0;
      let location = 0;
      let format = GpuVertexFormat::Float32x3;
      VertexAttribute
      {
        offset,
        location,
        format
      }
    }

    /// Sets the location in the shader
    pub fn location( mut self, location : u32 ) -> Self
    {
      self.location = location;
      self
    }

    /// Sets the format of the attribute
    pub fn format( mut self, format : GpuVertexFormat ) -> Self
    {
      self.format = format;
      self
    }

    /// Sets the offset from the size of a type
    pub fn offset< T : Sized >( mut self ) -> Self
    {
      self.offset = std::mem::size_of::< T >() as f64;
      self
    }

    /// Sets the offset from the provided value
    pub fn offset_from_value( mut self, offset : f64 ) -> Self
    {
      self.offset = offset;
      self
    }
  }

  impl From< VertexAttribute > for web_sys::GpuVertexAttribute 
  {
    fn from( value: VertexAttribute ) -> Self {
      let attribute = web_sys::GpuVertexAttribute::new
      (
        value.format, 
        value.offset, 
        value.location
      );

      attribute
    }    
  }

  /// Calculates the size in bytes of a given `GpuVertexFormat`.
  pub fn format_to_size( format : web_sys::GpuVertexFormat ) -> usize
  {
    use web_sys::GpuVertexFormat;
    use std::mem::size_of;
    match format 
    {
      // 8
      GpuVertexFormat::Uint8x2 |
      GpuVertexFormat::Sint8x2 |
      GpuVertexFormat::Unorm8x2 |
      GpuVertexFormat::Snorm8x2 => size_of::< [ u8; 2 ] >(),

      GpuVertexFormat::Uint8x4 |
      GpuVertexFormat::Sint8x4 | 
      GpuVertexFormat::Unorm8x4 |
      GpuVertexFormat::Snorm8x4 => size_of::< [ u8; 4 ] >(),

      // 16
      GpuVertexFormat::Uint16x2 | 
      GpuVertexFormat::Sint16x2 | 
      GpuVertexFormat::Unorm16x2 |
      GpuVertexFormat::Snorm16x2 | 
      GpuVertexFormat::Float16x2 => size_of::< [ u16; 2 ] >(),
      
      GpuVertexFormat::Uint16x4 | 
      GpuVertexFormat::Sint16x4 | 
      GpuVertexFormat::Unorm16x4 |
      GpuVertexFormat::Snorm16x4 | 
      GpuVertexFormat::Float16x4 => size_of::< [ u16; 4 ] >(),

      // 32
      GpuVertexFormat::Float32 | 
      GpuVertexFormat::Uint32  | 
      GpuVertexFormat::Sint32  |
      GpuVertexFormat::Unorm1010102 => size_of::< [ u32; 1 ] >(),

      GpuVertexFormat::Float32x2 | 
      GpuVertexFormat::Uint32x2  | 
      GpuVertexFormat::Sint32x2  => size_of::< [ u32; 2 ] >(),

      GpuVertexFormat::Float32x3 | 
      GpuVertexFormat::Uint32x3  |
      GpuVertexFormat::Sint32x3  => size_of::< [ u32; 3 ] >(),

      GpuVertexFormat::Float32x4 | 
      GpuVertexFormat::Uint32x4  | 
      GpuVertexFormat::Sint32x4  => size_of::< [ u32; 4 ] >(),
      _ => panic!( "Unexpected vertex format")
    }
  }

}

crate::mod_interface!
{
  own use
  {
    format_to_size
  };

  exposed use
  {
    VertexAttribute
  };
}