e2r 0.10.0

experimental rendering engine in rust
Documentation 
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

use std::cmp;
use std::marker;

use interface::i_interpolate::*;
use interface::i_load;

use implement::util::loadqueue;

// #[derive(Debug)]
#[derive(Clone)]
pub struct Piecewise< T, V > where T: IInterpolate< V >, V : Clone {
    pub _pieces: Vec< T >,
    _current_piece: u64,
    pub _total_steps: u64,
    pub _phantom: marker::PhantomData< V >,
    pub _load: loadqueue::LoadQueue< V >,
}

impl < T, V > Piecewise< T, V > where T: IInterpolate< V >, V : Clone {
    pub fn init() -> Piecewise< T, V > {
        Piecewise { _pieces: Vec::new(),
                    _current_piece: 0u64,
                    _total_steps: 0u64,
                    _phantom: marker::PhantomData,
                    _load: Default::default(),
        }
    }
    pub fn add( & mut self, s: T ){
        self._total_steps = self._total_steps + s.num_steps();
        self._pieces.push( s );
    }
    pub fn interp_current( & self ) -> V {
        if self._current_piece as usize >= self._pieces.len() {
            self._pieces[ self._pieces.len() - 1 ].interp_current()
        } else {
            self._pieces[ self._current_piece as usize ].interp_current()
        }
    }
    pub fn reset( & mut self ) {
        for i in 0..self._pieces.len() {
            self._pieces[i].reset();
        }
        self._current_piece = 0u64;
    }
}

#[allow(unused_variables)]
impl < T, V > IInterpolate< V > for Piecewise< T, V > where T: IInterpolate< V >, V : Clone {
    fn num_steps( & self ) -> u64 {
        self._total_steps
    }
    fn interp_delta( & mut self, steps: i64 ) -> Option< V > {
        let mut ret = None;
        for i in 0..steps {
            match self.next() {
                Some(x) => {
                    ret = Some( self.interp_current() );
                },
                None => {
                    return ret
                },
            }
        }
        ret
    }
    fn interp_current( & self ) -> V {
        if self._current_piece as usize >= self._pieces.len() {
            self._pieces[ self._pieces.len() - 1 ].interp_current()
        } else {
            self._pieces[ self._current_piece as usize ].interp_current()
        }
    }
    fn interp_is_end( & self ) -> bool {
        (self._current_piece as usize) >= self._pieces.len() ||
            ( ( self._current_piece as usize == ( self._pieces.len() - 1 ) ) && 
                self._pieces[ self._current_piece as usize ].interp_is_end() )
    }
    fn interp_is_start( & self ) -> bool {
        self._current_piece == 0 && self._pieces[ self._current_piece as usize ].interp_is_start()        
    }
    fn reset( & mut self ){
        for i in 0..self._pieces.len() {
            self._pieces[i].reset();
        }
    }
}

/// required trait for IInterpolate
impl < T, V > Iterator for Piecewise< T, V > where T: IInterpolate< V >, V : Clone {
    type Item = V;
    fn next( & mut self ) -> Option< V > {
        if self._current_piece as usize >= self._pieces.len() {
            return None
        } else {
            let n = self._pieces[ self._current_piece as usize ].next();
            match n {
                Some(s) => return Some(s),
                None => {
                    self._current_piece = cmp::min( self._current_piece + 1, self._pieces.len() as _ );
                    if self._current_piece as usize >= self._pieces.len() {
                        return None
                    } else {
                        match self.next() {
                            Some( o ) => Some( o ),
                            None => {
                                if self._current_piece as usize == self._pieces.len() - 1 {
                                    self._current_piece += 1;
                                }
                                None
                            },
                        }
                    }
                }
            }
        }
    }
}

impl < T, V > DoubleEndedIterator for Piecewise< T, V > where T: IInterpolate< V > , V : Clone {
    fn next_back( & mut self ) -> Option< V > {
        unimplemented!();
    }
}


impl < T, V > i_load::ILoad for Piecewise< T, V > where T: IInterpolate< V >, V : Clone {

    type InputType = V;
    
    fn load( & mut self, t: Self::InputType ) -> Result< (), & 'static str > {
        self._load.load( t )?;
        Ok( () )
    }
    fn apply( & mut self ) -> Result< bool, & 'static str > {
        
        let mut count_fetched = 0;

        let mut fetched  = None;
        
        self._load.apply( | x: & Self::InputType | { if count_fetched < 1 {
            fetched = Some( x.clone() );
            count_fetched += 1;
            true
        } else {
            false
        } } )?;

        //todo: do something with fetch

        Ok( true )
    }    
}