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

use std::collections::HashMap;
use std::io::Read;

use super::Texture;
use crate::network::packet::ResourceData;
use crate::{math::Mat3, math::Vec3, EngineError};
use image::DynamicImage;
use spine::atlas::Atlas;
use spine::skeleton::Skeleton;
use std::convert::TryFrom;
use std::hash::{Hash, Hasher};

#[derive(Debug)]
struct OwnedSpriteState {
    attachment: String,
    transform: [[f32; 3]; 3],
}

pub struct AnimationState {
    /// transformation matrix for the subsprite
    pub transform: Mat3,
    /// attachment id
    pub att_id: u64,
}

pub struct AnimationStates<'a> {
    sprites: std::vec::IntoIter<OwnedSpriteState>,
    atlas: &'a HashMap<u64, Texture>,
}

impl AnimationState {
    fn new(transform: [[f32; 3]; 3], attachment_id: u64) -> Self {
        let tscale = Mat3::scaling(0.5 / 512.0, 0.5 / 512.0);
        let ascale = Mat3::scaling(1.2, 1.2);
        let mat = Mat3::from_vec3(
            Vec3::from(transform[0]),
            Vec3::from(transform[1]),
            Vec3::from(transform[2]),
        );
        Self {
            transform: tscale * mat * ascale,
            att_id: attachment_id,
        }
    }
}

impl<'a> AnimationStates<'a> {
    fn new(
        sprites: std::vec::IntoIter<OwnedSpriteState>,
        atlas: &'a HashMap<u64, Texture>,
    ) -> Self {
        Self { sprites, atlas }
    }
}

impl<'a> Iterator for AnimationStates<'a> {
    type Item = Result<AnimationState, EngineError>;
    fn next(&mut self) -> Option<Self::Item> {
        let sprite = self.sprites.next()?;
        let mut hasher = std::collections::hash_map::DefaultHasher::new();
        sprite.attachment.hash(&mut hasher);
        let att_id = hasher.finish();
        if self.atlas.contains_key(&att_id) {
            Some(Ok(AnimationState::new(sprite.transform, att_id)))
        } else {
            Some(Err(EngineError::ResourceMissing(format!(
                "Could not get sprite attachment \"{}\"",
                sprite.attachment
            ))))
        }
    }
}

pub struct Character {
    skeleton: Skeleton,
    atlas: HashMap<u64, Texture>,
}

impl Character {
    pub fn new<R: Read>(
        texture: DynamicImage,
        skeleton: Skeleton,
        atlas: Atlas<R>,
    ) -> Result<Self, EngineError> {
        let mut segments = HashMap::new();
        for segment in atlas {
            let segment = segment.map_err(|e| {
                EngineError::ResourceFormat(format!("Could not parse atlas \"{}\"", e))
            })?;
            let mut hasher = std::collections::hash_map::DefaultHasher::new();
            segment.name.hash(&mut hasher);
            let (x, y) = segment.xy;
            let (width, height) = segment.size;
            let tex = texture.crop_imm(x as u32, y as u32, width as u32, height as u32);
            if segment.rotate {
                tex.rotate90();
            }
            segments.insert(hasher.finish(), Texture::from_dynamic_image(tex));
        }
        Ok(Self::from_parts(skeleton, segments))
    }

    pub fn from_parts(skeleton: Skeleton, atlas: HashMap<u64, Texture>) -> Self {
        Self { skeleton, atlas }
    }

    pub fn from_memory(
        texture: &[u8],
        animation: &[u8],
        atlas: &[u8],
    ) -> Result<Self, EngineError> {
        let texture = image::load_from_memory_with_format(texture, image::ImageFormat::Png);
        let atlas = spine::atlas::Atlas::from_reader(atlas);
        let skeleton = spine::skeleton::Skeleton::from_reader(animation);
        Character::new(texture?, skeleton?, atlas?)
    }

    pub fn skeleton(&self) -> &Skeleton {
        &self.skeleton
    }

    pub fn atlas(&self) -> &HashMap<u64, Texture> {
        &self.atlas
    }

    pub fn skeleton_mut(&mut self) -> &mut Skeleton {
        &mut self.skeleton
    }

    pub fn atlas_mut(&mut self) -> &mut HashMap<u64, Texture> {
        &mut self.atlas
    }

    pub fn interpolate(&self, time: f32, anim_name: &str) -> Result<AnimationStates, EngineError> {
        let animated_skin = self
            .skeleton
            .get_animated_skin("default", Some(anim_name))?;
        let time = time.rem_euclid(animated_skin.get_duration());
        Ok(AnimationStates::new(
            animated_skin
                .interpolate(time)
                .ok_or_else(|| {
                    EngineError::Animation(format!(
                        "Could not interpolate animation at time {}",
                        time,
                    ))
                })?
                .map(|s| OwnedSpriteState {
                    attachment: s.attachment.to_owned(),
                    transform: s.to_matrix3(),
                })
                .collect::<Vec<_>>()
                .into_iter(),
            &self.atlas,
        ))
    }
}

impl<'a> TryFrom<ResourceData<'a>> for Character {
    type Error = EngineError;
    fn try_from(chr_data: ResourceData<'a>) -> Result<Self, Self::Error> {
        if let ResourceData::CharacterVec {
            texture_len,
            atlas_len,
            animation_len,
            data,
        } = chr_data
        {
            Character::from_memory(
                &data[0..texture_len as usize],
                &data[(texture_len + atlas_len) as usize
                    ..(texture_len + atlas_len + animation_len) as usize],
                &data[texture_len as usize..(atlas_len + texture_len) as usize],
            )
        } else {
            Err(EngineError::ResourceFormat(
                "The given data is not a character variant".into(),
            ))
        }
    }
}