1/*
2 * Copyright (C) 2016 Google, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef SIMULATION_H
18#define SIMULATION_H
19
20#include <memory>
21#include <random>
22#include <vector>
23
24#include <glm/glm.hpp>
25
26#include "Meshes.h"
27
28class Animation {
29   public:
30    Animation(unsigned rng_seed, float scale);
31
32    glm::mat4 transformation(float t);
33
34   private:
35    struct Data {
36        glm::vec3 axis;
37        float speed;
38        float scale;
39
40        glm::mat4 matrix;
41    };
42
43    std::mt19937 rng_;
44    std::uniform_real_distribution<float> dir_;
45    std::uniform_real_distribution<float> speed_;
46
47    Data current_;
48};
49
50class Curve;
51
52class Path {
53   public:
54    Path(unsigned rng_seed);
55
56    glm::vec3 position(float t);
57
58   private:
59    struct Subpath {
60        glm::vec3 origin;
61        float start;
62        float end;
63        float now;
64
65        std::shared_ptr<Curve> curve;
66    };
67
68    void generate_subpath();
69
70    std::mt19937 rng_;
71    std::uniform_int_distribution<> type_;
72    std::uniform_real_distribution<float> duration_;
73
74    Subpath current_;
75};
76
77class Simulation {
78   public:
79    Simulation(int object_count);
80
81    struct Object {
82        Meshes::Type mesh;
83        glm::vec3 light_pos;
84        glm::vec3 light_color;
85
86        Animation animation;
87        Path path;
88
89        uint32_t frame_data_offset;
90
91        glm::mat4 model;
92    };
93
94    const std::vector<Object> &objects() const { return objects_; }
95
96    unsigned int rng_seed() { return random_dev_(); }
97
98    void set_frame_data_size(uint32_t size);
99    void update(float time, int begin, int end);
100
101   private:
102    std::random_device random_dev_;
103    std::vector<Object> objects_;
104};
105
106#endif  // SIMULATION_H
107