1 | // |
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2 | // Lol Engine |
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3 | // |
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4 | // Copyright: (c) 2010-2012 Sam Hocevar <sam@hocevar.net> |
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5 | // This program is free software; you can redistribute it and/or |
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6 | // modify it under the terms of the Do What The Fuck You Want To |
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7 | // Public License, Version 2, as published by Sam Hocevar. See |
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8 | // http://sam.zoy.org/projects/COPYING.WTFPL for more details. |
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9 | // |
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10 | |
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11 | #if defined HAVE_CONFIG_H |
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12 | # include "config.h" |
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13 | #endif |
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14 | |
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15 | #include "core.h" |
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16 | |
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17 | namespace lol |
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18 | { |
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19 | |
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20 | /* |
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21 | * Emitter implementation class |
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22 | */ |
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23 | |
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24 | class EmitterData |
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25 | { |
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26 | friend class Emitter; |
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27 | |
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28 | static const int MAX_PARTICLES = 1000; |
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29 | |
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30 | private: |
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31 | TileSet *tileset; |
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32 | vec3 gravity; |
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33 | int particles[MAX_PARTICLES]; |
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34 | vec3 positions[MAX_PARTICLES]; |
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35 | vec3 velocities[MAX_PARTICLES]; |
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36 | int nparticles; |
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37 | }; |
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38 | |
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39 | /* |
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40 | * Public Emitter class |
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41 | */ |
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42 | |
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43 | Emitter::Emitter(TileSet *tileset, vec3 gravity) |
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44 | : data(new EmitterData()) |
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45 | { |
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46 | data->tileset = tileset; |
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47 | data->gravity = gravity; |
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48 | data->nparticles = 0; |
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49 | } |
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50 | |
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51 | void Emitter::TickGame(float seconds) |
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52 | { |
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53 | for (int i = 0; i < data->nparticles; i++) |
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54 | { |
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55 | vec3 oldvelocity = data->velocities[i]; |
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56 | data->velocities[i] += seconds * data->gravity; |
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57 | data->positions[i] += seconds * 0.5f |
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58 | * (oldvelocity + data->velocities[i]); |
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59 | if (data->positions[i].y < -100) |
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60 | { |
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61 | data->particles[i] = data->particles[data->nparticles - 1]; |
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62 | data->positions[i] = data->positions[data->nparticles - 1]; |
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63 | data->velocities[i] = data->velocities[data->nparticles - 1]; |
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64 | data->nparticles--; |
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65 | } |
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66 | } |
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67 | |
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68 | Entity::TickGame(seconds); |
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69 | } |
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70 | |
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71 | void Emitter::TickDraw(float seconds) |
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72 | { |
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73 | Entity::TickDraw(seconds); |
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74 | |
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75 | for (int i = 0; i < data->nparticles; i++) |
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76 | Scene::GetDefault()->AddTile(data->tileset, data->particles[i], |
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77 | data->positions[i], 0, vec2(1.0f)); |
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78 | } |
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79 | |
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80 | void Emitter::AddParticle(int id, vec3 pos, vec3 vel) |
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81 | { |
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82 | if (data->nparticles >= EmitterData::MAX_PARTICLES) |
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83 | return; |
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84 | |
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85 | data->particles[data->nparticles] = id; |
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86 | data->positions[data->nparticles] = pos; |
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87 | data->velocities[data->nparticles] = vel; |
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88 | data->nparticles++; |
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89 | } |
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90 | |
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91 | Emitter::~Emitter() |
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92 | { |
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93 | delete data; |
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94 | } |
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95 | |
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96 | } /* namespace lol */ |
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97 | |
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