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

use crate::core::texture::*;
///
/// A 3D color texture.
///
pub struct Texture3D {
    context: Context,
    id: crate::context::Texture,
    width: u32,
    height: u32,
    depth: u32,
    number_of_mip_maps: u32,
    data_byte_size: usize,
}

impl Texture3D {
    ///
    /// Construcs a new 3D texture with the given data.
    ///
    pub fn new(context: &Context, cpu_texture: &CpuTexture3D) -> ThreeDResult<Self> {
        match cpu_texture.data {
            TextureData::RU8(ref data) => Self::new_with_data(context, cpu_texture, data),
            TextureData::RgU8(ref data) => Self::new_with_data(context, cpu_texture, data),
            TextureData::RgbU8(ref data) => Self::new_with_data(context, cpu_texture, data),
            TextureData::RgbaU8(ref data) => Self::new_with_data(context, cpu_texture, data),
            TextureData::RF16(ref data) => Self::new_with_data(context, cpu_texture, data),
            TextureData::RgF16(ref data) => Self::new_with_data(context, cpu_texture, data),
            TextureData::RgbF16(ref data) => Self::new_with_data(context, cpu_texture, data),
            TextureData::RgbaF16(ref data) => Self::new_with_data(context, cpu_texture, data),
            TextureData::RF32(ref data) => Self::new_with_data(context, cpu_texture, data),
            TextureData::RgF32(ref data) => Self::new_with_data(context, cpu_texture, data),
            TextureData::RgbF32(ref data) => Self::new_with_data(context, cpu_texture, data),
            TextureData::RgbaF32(ref data) => Self::new_with_data(context, cpu_texture, data),
        }
    }

    fn new_with_data<T: TextureDataType>(
        context: &Context,
        cpu_texture: &CpuTexture3D,
        data: &[T],
    ) -> ThreeDResult<Self> {
        let mut texture = Self::new_empty::<T>(
            context,
            cpu_texture.width,
            cpu_texture.height,
            cpu_texture.depth,
            cpu_texture.min_filter,
            cpu_texture.mag_filter,
            cpu_texture.mip_map_filter,
            cpu_texture.wrap_s,
            cpu_texture.wrap_t,
            cpu_texture.wrap_r,
        )?;
        texture.fill(data)?;
        Ok(texture)
    }

    ///
    /// Creates a new empty 3D color texture.
    ///
    pub fn new_empty<T: TextureDataType>(
        context: &Context,
        width: u32,
        height: u32,
        depth: u32,
        min_filter: Interpolation,
        mag_filter: Interpolation,
        mip_map_filter: Option<Interpolation>,
        wrap_s: Wrapping,
        wrap_t: Wrapping,
        wrap_r: Wrapping,
    ) -> ThreeDResult<Self> {
        let id = generate(context)?;
        let number_of_mip_maps =
            calculate_number_of_mip_maps(mip_map_filter, width, height, Some(depth));
        let tex = Self {
            context: context.clone(),
            id,
            width,
            height,
            depth,
            number_of_mip_maps,
            data_byte_size: std::mem::size_of::<T>(),
        };
        tex.bind();
        set_parameters(
            context,
            crate::context::TEXTURE_3D,
            min_filter,
            mag_filter,
            if number_of_mip_maps == 1 {
                None
            } else {
                mip_map_filter
            },
            wrap_s,
            wrap_t,
            Some(wrap_r),
        )?;
        unsafe {
            context.tex_storage_3d(
                crate::context::TEXTURE_3D,
                number_of_mip_maps as i32,
                T::internal_format(),
                width as i32,
                height as i32,
                depth as i32,
            );
        }
        context.error_check()?;
        Ok(tex)
    }

    ///
    /// Fills this texture with the given data.
    ///
    /// # Errors
    /// Returns an error if the length of the data does not correspond to the width, height, depth and format specified at construction.
    /// It is therefore necessary to create a new texture if the texture size or format has changed.
    ///
    pub fn fill<T: TextureDataType>(&mut self, data: &[T]) -> ThreeDResult<()> {
        check_data_length(
            self.width,
            self.height,
            self.depth,
            self.data_byte_size,
            data,
        )?;
        self.bind();
        unsafe {
            self.context.tex_sub_image_3d(
                crate::context::TEXTURE_3D,
                0,
                0,
                0,
                0,
                self.width as i32,
                self.height as i32,
                self.depth as i32,
                format_from_data_type::<T>(),
                T::data_type(),
                crate::context::PixelUnpackData::Slice(to_byte_slice(data)),
            );
        }
        self.generate_mip_maps();
        self.context.error_check()
    }

    /// The width of this texture.
    pub fn width(&self) -> u32 {
        self.width
    }

    /// The height of this texture.
    pub fn height(&self) -> u32 {
        self.height
    }

    /// The depth of this texture.
    pub fn depth(&self) -> u32 {
        self.depth
    }

    fn generate_mip_maps(&self) {
        if self.number_of_mip_maps > 1 {
            self.bind();
            unsafe {
                self.context.generate_mipmap(crate::context::TEXTURE_3D);
            }
        }
    }
    pub(in crate::core) fn bind(&self) {
        unsafe {
            self.context
                .bind_texture(crate::context::TEXTURE_3D, Some(self.id));
        }
    }
}

impl Drop for Texture3D {
    fn drop(&mut self) {
        unsafe {
            self.context.delete_texture(self.id);
        }
    }
}