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

use crate::{ext::*, math::*, *};

use std::rc::Rc;

/// Construct a set of [`Sprite`]s from a set of `riddle_image::Image`s which share a texture atlas.

///

/// # Example

///

/// ```no_run

/// # use riddle::{common::Color, image::*, platform::*, renderer::*, math::*, *};

/// # fn main() -> Result<(), RiddleError> {

/// # let rdl =  RiddleLib::new()?;

/// # let window = WindowBuilder::new().build(rdl.context())?;

/// let renderer = Renderer::new_from_window(&window)?;

///

/// let img1 = Image::new(100, 100);

/// let img2 = Image::new(50, 50);

///

/// let mut sprite1 = None;

/// let mut sprite2 = None;

///

/// SpriteAtlasBuilder::new()

///     .with_image(img1, &mut sprite1)

///     .with_image(img2, &mut sprite2)

///     .build(&renderer)?;

///

/// assert!(sprite1.is_some());

/// assert!(sprite2.is_some());

/// # Ok(()) }

/// ```

pub struct SpriteAtlasBuilder<'a> {
    images: Vec<(image::Image, &'a mut Option<Sprite>)>,

    mag_filter: FilterMode,
    min_filter: FilterMode,

    max_height: u32,
    total_width: u32,
}

impl<'a> SpriteAtlasBuilder<'a> {
    /// A new empty atlas builder

    pub fn new() -> Self {
        Self {
            images: vec![],
            max_height: 0,
            total_width: 0,
            mag_filter: Default::default(),
            min_filter: Default::default(),
        }
    }

    /// Add an image to be packed in to the atlas, along with a reference

    /// to the `Option<Sprite>` which will store the sprite when the atlas is built.

    pub fn with_image(mut self, img: image::Image, sprite: &'a mut Option<Sprite>) -> Self {
        self.total_width += img.width();
        self.max_height = self.max_height.max(img.height());
        self.images.push((img, sprite));
        self
    }

    /// Specify the min and mag filters used when rendering the created sprites.

    pub fn with_filter_modes(mut self, mag_filter: FilterMode, min_filter: FilterMode) -> Self {
        self.mag_filter = mag_filter;
        self.min_filter = min_filter;
        self
    }

    /// Construct the atlas texture from the given set of images, and update the

    /// `Option<Sprite>` references.

    pub fn build(self, renderer: &Renderer) -> Result<()> {
        let mut atlas = image::Image::new(self.total_width, self.max_height);
        let mut sprite_bounds = vec![];
        let mut x = 0;
        for (img, sprite) in self.images {
            sprite_bounds.push((
                Rect {
                    location: Vector2 { x: x, y: 0 },
                    dimensions: img.dimensions(),
                },
                sprite,
            ));
            atlas.blit(&img, Vector2 { x, y: 0 }.convert());
            x += img.width();
        }

        let texture = Rc::new(Texture::from_image(
            renderer.wgpu_device().device(),
            renderer.wgpu_device().queue(),
            atlas,
            self.mag_filter,
            self.min_filter,
            TextureType::Plain,
        )?);

        for (bounds, sprite) in sprite_bounds {
            *sprite = Some(Sprite::from_texture_with_bounds(
                renderer,
                &texture,
                bounds.convert(),
            )?);
        }

        Ok(())
    }
}