Tony Barbour | 2f18b29 | 2016-02-25 15:44:10 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 Google, Inc. |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 5 | * copy of this software and associated documentation files (the "Software"), |
| 6 | * to deal in the Software without restriction, including without limitation |
| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
| 9 | * Software is furnished to do so, subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice shall be included |
| 12 | * in all copies or substantial portions of the Software. |
| 13 | * |
| 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 17 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 19 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 20 | * DEALINGS IN THE SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #include <cassert> |
| 24 | #include <cmath> |
| 25 | #include <array> |
| 26 | #include <glm/gtc/matrix_transform.hpp> |
| 27 | #include "Simulation.h" |
| 28 | |
| 29 | namespace { |
| 30 | |
| 31 | class MeshPicker { |
| 32 | public: |
| 33 | MeshPicker() : |
| 34 | pattern_({ |
| 35 | Meshes::MESH_PYRAMID, |
| 36 | Meshes::MESH_ICOSPHERE, |
| 37 | Meshes::MESH_TEAPOT, |
| 38 | Meshes::MESH_PYRAMID, |
| 39 | Meshes::MESH_ICOSPHERE, |
| 40 | Meshes::MESH_PYRAMID, |
| 41 | Meshes::MESH_PYRAMID, |
| 42 | Meshes::MESH_PYRAMID, |
| 43 | Meshes::MESH_PYRAMID, |
| 44 | Meshes::MESH_PYRAMID, |
| 45 | }), cur_(-1) |
| 46 | { |
| 47 | } |
| 48 | |
| 49 | Meshes::Type pick() |
| 50 | { |
| 51 | cur_ = (cur_ + 1) % pattern_.size(); |
| 52 | return pattern_[cur_]; |
| 53 | } |
| 54 | |
| 55 | float scale(Meshes::Type type) const |
| 56 | { |
| 57 | float base = 0.005f; |
| 58 | |
| 59 | switch (type) { |
| 60 | case Meshes::MESH_PYRAMID: |
| 61 | default: |
| 62 | return base * 1.0f; |
| 63 | case Meshes::MESH_ICOSPHERE: |
| 64 | return base * 3.0f; |
| 65 | case Meshes::MESH_TEAPOT: |
| 66 | return base * 10.0f; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | private: |
| 71 | const std::array<Meshes::Type, 10> pattern_; |
| 72 | int cur_; |
| 73 | }; |
| 74 | |
| 75 | class ColorPicker { |
| 76 | public: |
| 77 | ColorPicker(unsigned int rng_seed) : |
| 78 | rng_(rng_seed), |
| 79 | red_(0.0f, 1.0f), |
| 80 | green_(0.0f, 1.0f), |
| 81 | blue_(0.0f, 1.0f) |
| 82 | { |
| 83 | } |
| 84 | |
| 85 | glm::vec3 pick() |
| 86 | { |
| 87 | return glm::vec3{ red_(rng_), |
| 88 | green_(rng_), |
| 89 | blue_(rng_) }; |
| 90 | } |
| 91 | |
| 92 | private: |
| 93 | std::mt19937 rng_; |
| 94 | std::uniform_real_distribution<float> red_; |
| 95 | std::uniform_real_distribution<float> green_; |
| 96 | std::uniform_real_distribution<float> blue_; |
| 97 | }; |
| 98 | |
| 99 | } // namespace |
| 100 | |
| 101 | Animation::Animation(unsigned int rng_seed, float scale) |
| 102 | : rng_(rng_seed), dir_(-1.0f, 1.0f), speed_(0.1f, 1.0f) |
| 103 | { |
| 104 | float x = dir_(rng_); |
| 105 | float y = dir_(rng_); |
| 106 | float z = dir_(rng_); |
| 107 | if (std::abs(x) + std::abs(y) + std::abs(z) == 0.0f) |
| 108 | x = 1.0f; |
| 109 | |
| 110 | current_.axis = glm::normalize(glm::vec3(x, y, z)); |
| 111 | |
| 112 | current_.speed = speed_(rng_); |
| 113 | current_.scale = scale; |
| 114 | |
| 115 | current_.matrix = glm::scale(glm::mat4(1.0f), glm::vec3(current_.scale)); |
| 116 | } |
| 117 | |
| 118 | glm::mat4 Animation::transformation(float t) |
| 119 | { |
| 120 | current_.matrix = glm::rotate(current_.matrix, current_.speed * t, current_.axis); |
| 121 | |
| 122 | return current_.matrix; |
| 123 | } |
| 124 | |
| 125 | class Curve { |
| 126 | public: |
| 127 | virtual ~Curve() {} |
| 128 | virtual glm::vec3 evaluate(float t) = 0; |
| 129 | }; |
| 130 | |
| 131 | namespace { |
| 132 | |
| 133 | enum CurveType { |
| 134 | CURVE_RANDOM, |
| 135 | CURVE_CIRCLE, |
| 136 | CURVE_COUNT, |
| 137 | }; |
| 138 | |
| 139 | class RandomCurve : public Curve { |
| 140 | public: |
| 141 | RandomCurve(unsigned int rng_seed) |
| 142 | : rng_(rng_seed), direction_(-0.3f, 0.3f), duration_(1.0f, 5.0f), |
| 143 | segment_start_(0.0f), segment_direction_(0.0f), |
| 144 | time_start_(0.0f), time_duration_(0.0f) |
| 145 | { |
| 146 | } |
| 147 | |
| 148 | glm::vec3 evaluate(float t) |
| 149 | { |
| 150 | if (t >= time_start_ + time_duration_) |
| 151 | new_segment(t); |
| 152 | |
| 153 | pos_ += unit_dir_ * (t - last_); |
| 154 | last_ = t; |
| 155 | |
| 156 | return pos_; |
| 157 | } |
| 158 | |
| 159 | private: |
| 160 | void new_segment(float time_start) |
| 161 | { |
| 162 | segment_start_ += segment_direction_; |
| 163 | segment_direction_ = glm::vec3(direction_(rng_), |
| 164 | direction_(rng_), |
| 165 | direction_(rng_)); |
| 166 | |
| 167 | time_start_ = time_start; |
| 168 | time_duration_ = duration_(rng_); |
| 169 | |
| 170 | unit_dir_ = segment_direction_ / time_duration_; |
| 171 | pos_ = segment_start_; |
| 172 | last_ = time_start_; |
| 173 | } |
| 174 | |
| 175 | std::mt19937 rng_; |
| 176 | std::uniform_real_distribution<float> direction_; |
| 177 | std::uniform_real_distribution<float> duration_; |
| 178 | |
| 179 | glm::vec3 segment_start_; |
| 180 | glm::vec3 segment_direction_; |
| 181 | float time_start_; |
| 182 | float time_duration_; |
| 183 | |
| 184 | glm::vec3 unit_dir_; |
| 185 | glm::vec3 pos_; |
| 186 | float last_; |
| 187 | }; |
| 188 | |
| 189 | class CircleCurve : public Curve { |
| 190 | public: |
| 191 | CircleCurve(float radius, glm::vec3 axis) |
| 192 | : r_(radius) |
| 193 | { |
| 194 | glm::vec3 a; |
| 195 | |
| 196 | if (axis.x != 0.0f) { |
| 197 | a.x = -axis.z / axis.x; |
| 198 | a.y = 0.0f; |
| 199 | a.z = 1.0f; |
| 200 | } else if (axis.y != 0.0f) { |
| 201 | a.x = 1.0f; |
| 202 | a.y = -axis.x / axis.y; |
| 203 | a.z = 0.0f; |
| 204 | } else { |
| 205 | a.x = 1.0f; |
| 206 | a.y = 0.0f; |
| 207 | a.z = -axis.x / axis.z; |
| 208 | } |
| 209 | |
| 210 | a_ = glm::normalize(a); |
| 211 | b_ = glm::normalize(glm::cross(a_, axis)); |
| 212 | } |
| 213 | |
| 214 | glm::vec3 evaluate(float t) |
| 215 | { |
| 216 | return (a_ * (glm::vec3(std::cos(t)) - glm::vec3(1.0f)) + b_ * glm::vec3(std::sin(t))) * |
| 217 | glm::vec3(r_); |
| 218 | } |
| 219 | |
| 220 | private: |
| 221 | float r_; |
| 222 | glm::vec3 a_; |
| 223 | glm::vec3 b_; |
| 224 | }; |
| 225 | |
| 226 | } // namespace |
| 227 | |
| 228 | Path::Path(unsigned int rng_seed) |
| 229 | : rng_(rng_seed), type_(0, CURVE_COUNT - 1), duration_(5.0f, 20.0f) |
| 230 | { |
| 231 | // trigger a subpath generation |
| 232 | current_.end = -1.0f; |
| 233 | current_.now = 0.0f; |
| 234 | } |
| 235 | |
| 236 | glm::vec3 Path::position(float t) |
| 237 | { |
| 238 | current_.now += t; |
| 239 | |
| 240 | while (current_.now >= current_.end) |
| 241 | generate_subpath(); |
| 242 | |
| 243 | return current_.origin + current_.curve->evaluate(current_.now - current_.start); |
| 244 | } |
| 245 | |
| 246 | void Path::generate_subpath() |
| 247 | { |
| 248 | float duration = duration_(rng_); |
| 249 | CurveType type = static_cast<CurveType>(type_(rng_)); |
| 250 | |
| 251 | if (current_.curve) { |
| 252 | current_.origin += current_.curve->evaluate(current_.end - current_.start); |
| 253 | current_.start = current_.end; |
| 254 | } else { |
| 255 | std::uniform_real_distribution<float> origin(0.0f, 2.0f); |
| 256 | current_.origin = glm::vec3(origin(rng_), origin(rng_), origin(rng_)); |
| 257 | current_.start = current_.now; |
| 258 | } |
| 259 | |
| 260 | current_.end = current_.start + duration; |
| 261 | |
| 262 | Curve *curve; |
| 263 | |
| 264 | switch (type) { |
| 265 | case CURVE_RANDOM: |
| 266 | curve = new RandomCurve(rng_()); |
| 267 | break; |
| 268 | case CURVE_CIRCLE: |
| 269 | { |
| 270 | std::uniform_real_distribution<float> dir(-1.0f, 1.0f); |
| 271 | glm::vec3 axis(dir(rng_), dir(rng_), dir(rng_)); |
| 272 | if (axis.x == 0.0f && axis.y == 0.0f && axis.z == 0.0f) |
| 273 | axis.x = 1.0f; |
| 274 | |
| 275 | std::uniform_real_distribution<float> radius_(0.02f, 0.2f); |
| 276 | curve = new CircleCurve(radius_(rng_), axis); |
| 277 | } |
| 278 | break; |
| 279 | default: |
| 280 | assert(!"unreachable"); |
| 281 | curve = nullptr; |
| 282 | break; |
| 283 | } |
| 284 | |
| 285 | current_.curve.reset(curve); |
| 286 | } |
| 287 | |
| 288 | Simulation::Simulation(int object_count) |
| 289 | : random_dev_() |
| 290 | { |
| 291 | MeshPicker mesh; |
| 292 | ColorPicker color(random_dev_()); |
| 293 | |
| 294 | objects_.reserve(object_count); |
| 295 | for (int i = 0; i < object_count; i++) { |
| 296 | Meshes::Type type = mesh.pick(); |
| 297 | float scale = mesh.scale(type); |
| 298 | |
| 299 | objects_.emplace_back(Object{ |
Dustin Graves | 20f5fc0 | 2016-04-06 10:16:05 -0600 | [diff] [blame] | 300 | type, glm::vec3(0.5f + 0.5f * (float)i / object_count), |
| 301 | color.pick(), Animation(random_dev_(), scale), Path(random_dev_()), |
Tony Barbour | 2f18b29 | 2016-02-25 15:44:10 -0700 | [diff] [blame] | 302 | }); |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | void Simulation::set_frame_data_size(uint32_t size) |
| 307 | { |
| 308 | uint32_t offset = 0; |
| 309 | for (auto &obj : objects_) { |
| 310 | obj.frame_data_offset = offset; |
| 311 | offset += size; |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | void Simulation::update(float time, int begin, int end) |
| 316 | { |
| 317 | for (int i = begin; i < end; i++) { |
| 318 | auto &obj = objects_[i]; |
| 319 | |
| 320 | glm::vec3 pos = obj.path.position(time); |
| 321 | glm::mat4 trans = obj.animation.transformation(time); |
| 322 | obj.model = glm::translate(glm::mat4(1.0f), pos) * trans; |
| 323 | } |
| 324 | } |