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annotate src/th06/interpolator.rs @ 745:90e907859bae

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examples: Simplify PNG load functions.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sat, 18 Jan 2020 16:27:57 +0100
parents 5016c09e5d7c
children
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1 //! Animation runner.
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2
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3 #[derive(Debug, Clone, Copy, PartialEq)]
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4 pub(crate) enum Formula {
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5 Linear,
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6 Power2,
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7 InvertPower2,
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8 }
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9
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10 impl Formula {
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11 fn apply(&self, x: f32) -> f32 {
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12 match self {
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13 Formula::Linear => x,
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14 Formula::Power2 => x * x,
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15 Formula::InvertPower2 => 2. * x - x * x,
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16 }
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17 }
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18 }
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19
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20 macro_rules! generate_interpolator {
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21 ($name:ident, $n:tt) => {
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22 #[derive(Debug, Clone)]
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23 pub(crate) struct $name<T> {
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24 start_values: [T; $n],
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25 end_values: [T; $n],
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26 start_frame: u32,
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27 end_frame: u32,
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28 formula: Formula,
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29 }
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30
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31 impl<T> $name<T>
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32 where f32: From<T>,
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33 T: From<f32>,
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34 T: std::ops::Sub<Output = T>,
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35 T: std::ops::Add<Output = T>,
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36 T: Copy,
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37 T: Default,
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38 {
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39 pub fn new(start_values: [T; $n], start_frame: u32, end_values: [T; $n], end_frame: u32, formula: Formula) -> $name<T> {
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40 $name {
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41 start_values,
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42 end_values,
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43 start_frame,
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44 end_frame,
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45 formula,
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46 }
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47 }
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48
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49 pub fn set_start(&mut self, frame: u32, values: [T; $n]) {
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50 self.start_values = values;
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51 self.start_frame = frame;
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52 }
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53
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54 pub fn set_end(&mut self, frame: u32, values: [T; $n]) {
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55 self.end_values = values;
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56 self.end_frame = frame;
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57 }
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58
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59 pub fn set_end_values(&mut self, values: [T; $n]) {
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60 self.end_values = values;
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61 }
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62
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63 pub fn set_end_frame(&mut self, frame: u32) {
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64 self.end_frame = frame;
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65 }
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66
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67 // XXX: Make it return [T; $n] instead, we don’t want to only do f32 here.
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68 pub fn values(&self, frame: u32) -> [f32; $n] {
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69 if frame + 1 >= self.end_frame {
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70 // XXX: skip the last interpolation step.
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71 // This bug is replicated from the original game.
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72 //self.start_frame = self.end_frame;
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73 //self.end_values
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74 let mut values: [f32; $n] = [Default::default(); $n];
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75 for (i, value) in self.end_values.iter().enumerate() {
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76 values[i] = f32::from(*value);
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77 }
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78 values
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79 } else {
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80 let mut coeff = (frame - self.start_frame) as f32 / (self.end_frame - self.start_frame) as f32;
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81 coeff = self.formula.apply(coeff);
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82 let mut values: [f32; $n] = [Default::default(); $n];
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83 for (i, (start, end)) in self.start_values.iter().zip(&self.end_values).enumerate() {
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84 values[i] = f32::from(*start + T::from(coeff * f32::from(*end - *start)));
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85 }
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86 values
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87 }
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88 }
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89 }
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90 };
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91 }
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92
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93 generate_interpolator!(Interpolator1, 1);
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94 generate_interpolator!(Interpolator2, 2);
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95 generate_interpolator!(Interpolator3, 3);
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96 //generate_interpolator!(Interpolator4, 4);