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1096
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1 /**
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2 * Copyright (c) 2006-2012 LOVE Development Team
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3 *
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4 * This software is provided 'as-is', without any express or implied
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5 * warranty. In no event will the authors be held liable for any damages
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6 * arising from the use of this software.
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7 *
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8 * Permission is granted to anyone to use this software for any purpose,
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9 * including commercial applications, and to alter it and redistribute it
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10 * freely, subject to the following restrictions:
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11 *
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12 * 1. The origin of this software must not be misrepresented; you must not
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13 * claim that you wrote the original software. If you use this software
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14 * in a product, an acknowledgment in the product documentation would be
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15 * appreciated but is not required.
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16 * 2. Altered source versions must be plainly marked as such, and must not be
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17 * misrepresented as being the original software.
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18 * 3. This notice may not be removed or altered from any source distribution.
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19 **/
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20
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21 #include "ParticleSystem.h"
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22
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23 #include "common/math.h"
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24
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25 #include "GLee.h"
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26 #include <cmath>
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27 #include <cstdlib>
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28
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29 namespace love
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30 {
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31 namespace graphics
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32 {
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33 namespace opengl
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34 {
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35
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36 namespace
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37 {
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38 Colorf colorToFloat(const Color &c)
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39 {
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40 return Colorf((GLfloat)c.r/255.0f, (GLfloat)c.g/255.0f, (GLfloat)c.b/255.0f, (GLfloat)c.a/255.0f);
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41 }
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42 }
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43
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44 float calculate_variation(float inner, float outer, float var)
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45 {
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46 float low = inner - (outer/2.0f)*var;
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47 float high = inner + (outer/2.0f)*var;
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48 float r = (rand() / (float(RAND_MAX)+1));
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49 return low*(1-r)+high*r;
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50 }
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51
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52
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53 ParticleSystem::ParticleSystem(Image *sprite, unsigned int buffer)
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54 : pStart(0)
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55 , pLast(0)
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56 , pEnd(0)
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57 , active(true)
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58 , emissionRate(0)
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59 , emitCounter(0)
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60 , lifetime(-1)
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61 , life(0)
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62 , particleLifeMin(0)
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63 , particleLifeMax(0)
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64 , direction(0)
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65 , spread(0)
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66 , relative(false)
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67 , speedMin(0)
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68 , speedMax(0)
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69 , gravityMin(0)
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70 , gravityMax(0)
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71 , radialAccelerationMin(0)
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72 , radialAccelerationMax(0)
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73 , tangentialAccelerationMin(0)
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74 , tangentialAccelerationMax(0)
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75 , sizeVariation(0)
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76 , rotationMin(0)
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77 , rotationMax(0)
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78 , spinStart(0)
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79 , spinEnd(0)
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80 , spinVariation(0)
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81 , offsetX(sprite->getWidth()*0.5f)
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82 , offsetY(sprite->getHeight()*0.5f)
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83 {
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84 this->sprite = sprite;
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85 sprite->retain();
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86 sizes.push_back(1.0f);
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87 colors.push_back(Colorf(1.0f, 1.0f, 1.0f, 1.0f));
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88 setBufferSize(buffer);
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89 }
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90
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91 ParticleSystem::~ParticleSystem()
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92 {
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93 if (this->sprite != 0)
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94 this->sprite->release();
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95
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96 if (pStart != 0)
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97 delete [] pStart;
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98 }
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99
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100 void ParticleSystem::add()
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101 {
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102 if (isFull()) return;
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103
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104 float min,max;
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105
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106 min = particleLifeMin;
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107 max = particleLifeMax;
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108 if (min == max)
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109 pLast->life = min;
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110 else
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111 pLast->life = (rand() / (float(RAND_MAX)+1)) * (max - min) + min;
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112 pLast->lifetime = pLast->life;
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113
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114 pLast->position[0] = position.getX();
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115 pLast->position[1] = position.getY();
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116
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117 min = direction - spread/2.0f;
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118 max = direction + spread/2.0f;
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119 pLast->direction = (rand() / (float(RAND_MAX)+1)) * (max - min) + min;
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120
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121 pLast->origin = position;
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122
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123 min = speedMin;
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124 max = speedMax;
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125 float speed = (rand() / (float(RAND_MAX)+1)) * (max - min) + min;
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126 pLast->speed = love::Vector(cos(pLast->direction), sin(pLast->direction));
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127 pLast->speed *= speed;
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128
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129 min = gravityMin;
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130 max = gravityMax;
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131 pLast->gravity = (rand() / (float(RAND_MAX)+1)) * (max - min) + min;
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132
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133 min = radialAccelerationMin;
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134 max = radialAccelerationMax;
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135 pLast->radialAcceleration = (rand() / (float(RAND_MAX)+1)) * (max - min) + min;
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136
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137 min = tangentialAccelerationMin;
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138 max = tangentialAccelerationMax;
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139 pLast->tangentialAcceleration = (rand() / (float(RAND_MAX)+1)) * (max - min) + min;
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140
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141 pLast->sizeOffset = (rand() / (float(RAND_MAX)+1)) * sizeVariation; // time offset for size change
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142 pLast->sizeIntervalSize = (1.0f - (rand() / (float(RAND_MAX)+1)) * sizeVariation) - pLast->sizeOffset;
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143 pLast->size = sizes[(size_t)(pLast->sizeOffset - .5f) * (sizes.size() - 1)];
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144
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145 min = rotationMin;
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146 max = rotationMax;
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147 pLast->spinStart = calculate_variation(spinStart, spinEnd, spinVariation);
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148 pLast->spinEnd = calculate_variation(spinEnd, spinStart, spinVariation);
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149 pLast->rotation = (rand() / (float(RAND_MAX)+1)) * (max - min) + min;;
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150
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151 pLast->color = colors[0];
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152
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153 pLast++;
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154 }
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155
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156 void ParticleSystem::remove(particle *p)
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157 {
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158 if (!isEmpty())
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159 {
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160 *p = *(--pLast);
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161 }
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162 }
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163
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164 void ParticleSystem::setSprite(Image *image)
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165 {
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166 if (sprite != 0)
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167 sprite->release();
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168
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169 sprite = image;
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170 sprite->retain();
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171 }
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172
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173 void ParticleSystem::setBufferSize(unsigned int size)
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174 {
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175 // delete previous data
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176 delete [] pStart;
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177
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178 pLast = pStart = new particle[size];
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179
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180 pEnd = pStart + size;
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181 }
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182
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183 void ParticleSystem::setEmissionRate(int rate)
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184 {
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185 emissionRate = rate;
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186 }
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187
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188 void ParticleSystem::setLifetime(float life)
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189 {
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190 this->life = lifetime = life;
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191 }
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192
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193 void ParticleSystem::setParticleLife(float min, float max)
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194 {
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195 particleLifeMin = min;
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196 if (max == 0)
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197 particleLifeMax = min;
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198 else
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199 particleLifeMax = max;
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200 }
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201
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202 void ParticleSystem::setPosition(float x, float y)
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203 {
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204 position = love::Vector(x, y);
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205 }
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206
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207 void ParticleSystem::setDirection(float direction)
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208 {
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209 this->direction = direction;
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210 }
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211
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212 void ParticleSystem::setSpread(float spread)
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213 {
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214 this->spread = spread;
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215 }
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216
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217 void ParticleSystem::setRelativeDirection(bool relative)
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218 {
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219 this->relative = relative;
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220 }
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221
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222 void ParticleSystem::setSpeed(float speed)
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223 {
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224 speedMin = speedMax = speed;
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225 }
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226
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227 void ParticleSystem::setSpeed(float min, float max)
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228 {
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229 speedMin = min;
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230 speedMax = max;
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231 }
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232
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233 void ParticleSystem::setGravity(float gravity)
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234 {
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235 gravityMin = gravityMax = gravity;
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236 }
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237
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238 void ParticleSystem::setGravity(float min, float max)
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239 {
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240 gravityMin = min;
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241 gravityMax = max;
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242 }
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243
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244 void ParticleSystem::setRadialAcceleration(float acceleration)
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245 {
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246 radialAccelerationMin = radialAccelerationMax = acceleration;
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247 }
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248
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249 void ParticleSystem::setRadialAcceleration(float min, float max)
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250 {
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251 radialAccelerationMin = min;
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252 radialAccelerationMax = max;
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253 }
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254
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255 void ParticleSystem::setTangentialAcceleration(float acceleration)
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256 {
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257 tangentialAccelerationMin = tangentialAccelerationMax = acceleration;
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258 }
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259
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260 void ParticleSystem::setTangentialAcceleration(float min, float max)
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261 {
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262 tangentialAccelerationMin = min;
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263 tangentialAccelerationMax = max;
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264 }
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265
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266 void ParticleSystem::setSize(float size)
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267 {
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268 sizes.resize(1);
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269 sizes[0] = size;
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270 }
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271
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272 void ParticleSystem::setSize(const std::vector<float> &newSizes, float variation)
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273 {
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274 sizes = newSizes;
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275 sizeVariation = variation;
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276 }
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277
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278 void ParticleSystem::setSizeVariation(float variation)
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279 {
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280 sizeVariation = variation;
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281 }
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282
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283 void ParticleSystem::setRotation(float rotation)
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284 {
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285 rotationMin = rotationMax = rotation;
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286 }
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287
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288 void ParticleSystem::setRotation(float min, float max)
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289 {
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290 rotationMin = min;
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291 rotationMax = max;
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292 }
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293
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294 void ParticleSystem::setSpin(float spin)
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295 {
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296 spinStart = spin;
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297 spinEnd = spin;
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298 }
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299
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300 void ParticleSystem::setSpin(float start, float end)
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301 {
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302 spinStart = start;
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303 spinEnd = end;
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304 }
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305
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306 void ParticleSystem::setSpin(float start, float end, float variation)
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307 {
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308 spinStart = start;
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309 spinEnd = end;
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310 spinVariation = variation;
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311 }
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312
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313 void ParticleSystem::setSpinVariation(float variation)
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314 {
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315 spinVariation = variation;
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316 }
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317
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318 void ParticleSystem::setColor(const Color &color)
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319 {
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320 colors.resize(1);
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321 colors[0] = colorToFloat(color);
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322 }
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323
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324 void ParticleSystem::setColor(const std::vector<Color> &newColors)
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325 {
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326 colors.resize(newColors.size());
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327 for (size_t i = 0; i < newColors.size(); ++i)
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328 colors[i] = colorToFloat(newColors[i]);
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329 }
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330
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331 void ParticleSystem::setOffset(float x, float y)
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332 {
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333 offsetX = x;
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334 offsetY = y;
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335 }
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336
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337 float ParticleSystem::getX() const
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338 {
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339 return position.getX();
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340 }
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341
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342 float ParticleSystem::getY() const
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343 {
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344 return position.getY();
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345 }
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346
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347 const love::Vector &ParticleSystem::getPosition() const
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348 {
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349 return position;
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350 }
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351
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352 float ParticleSystem::getDirection() const
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353 {
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354 return direction;
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355 }
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356
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357 float ParticleSystem::getSpread() const
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358 {
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359 return spread;
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360 }
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361
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362 float ParticleSystem::getOffsetX() const
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363 {
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364 return offsetX;
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365 }
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366
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367 float ParticleSystem::getOffsetY() const
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368 {
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369 return offsetY;
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370 }
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371
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372 int ParticleSystem::count() const
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373 {
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374 return (int)(pLast - pStart);
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375 }
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376
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377 void ParticleSystem::start()
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378 {
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379 active = true;
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380 }
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381
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382 void ParticleSystem::stop()
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383 {
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384 active = false;
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385 life = lifetime;
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386 emitCounter = 0;
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387 }
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388
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389 void ParticleSystem::pause()
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390 {
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391 active = false;
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392 }
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393
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394 void ParticleSystem::reset()
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395 {
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396 pLast = pStart;
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397 life = lifetime;
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398 emitCounter = 0;
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399 }
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400
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401 bool ParticleSystem::isActive() const
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402 {
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403 return active;
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404 }
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405
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406 bool ParticleSystem::isEmpty() const
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407 {
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408 return pStart == pLast;
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409 }
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410
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411 bool ParticleSystem::isFull() const
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412 {
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413 return pLast == pEnd;
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414 }
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415
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416 void ParticleSystem::draw(float x, float y, float angle, float sx, float sy, float ox, float oy, float kx, float ky) const
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417 {
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418 if (sprite == 0) return; // just in case of failure
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419
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420 glPushMatrix();
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421 glPushAttrib(GL_CURRENT_BIT);
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422
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423 Matrix t;
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424 t.setTransformation(x, y, angle, sx, sy, ox, oy, kx, ky);
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425 glMultMatrixf((const GLfloat *)t.getElements());
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426
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427 particle *p = pStart;
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428 while (p != pLast)
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429 {
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430 glPushMatrix();
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431
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432 glColor4f(p->color.r, p->color.g, p->color.b, p->color.a);
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433 sprite->draw(p->position[0], p->position[1], p->rotation, p->size, p->size, offsetX, offsetY, 0.0f, 0.0f);
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434
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435 glPopMatrix();
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436 p++;
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437 }
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438
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439 glPopAttrib();
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440 glPopMatrix();
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441 }
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442
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443 void ParticleSystem::update(float dt)
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444 {
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445 // Traverse all particles and update.
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446 particle *p = pStart;
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447
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448 // Make some more particles.
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449 if (active)
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450 {
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451 float rate = 1.0f / emissionRate; // the amount of time between each particle emit
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452 emitCounter += dt;
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453 while (emitCounter > rate)
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454 {
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455 add();
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456 emitCounter -= rate;
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457 }
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458 /*int particles = (int)(emissionRate * dt);
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459 for (int i = 0; i != particles; i++)
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460 add();*/
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461
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462 life -= dt;
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463 if (lifetime != -1 && life < 0)
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464 stop();
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465 }
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466
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467 while (p != pLast)
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468 {
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469 // Decrease lifespan.
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470 p->life -= dt;
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471
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472 if (p->life > 0)
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473 {
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474
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475 // Temp variables.
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476 love::Vector radial, tangential, gravity(0, p->gravity);
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477 love::Vector ppos(p->position[0], p->position[1]);
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478
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479 // Get vector from particle center to particle.
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480 radial = ppos - p->origin;
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481 radial.normalize();
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482 tangential = radial;
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483
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484 // Resize radial acceleration.
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485 radial *= p->radialAcceleration;
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486
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487 // Calculate tangential acceleration.
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488 {
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489 float a = tangential.getX();
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490 tangential.setX(-tangential.getY());
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491 tangential.setY(a);
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492 }
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493
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494 // Resize tangential.
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495 tangential *= p->tangentialAcceleration;
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496
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497 // Update position.
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498 p->speed += (radial+tangential+gravity)*dt;
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499
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500 // Modify position.
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501 ppos += p->speed * dt;
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502
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503 p->position[0] = ppos.getX();
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504 p->position[1] = ppos.getY();
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505
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506 const float t = 1.0f - p->life / p->lifetime;
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507
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508 // Rotate.
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509 p->rotation += (p->spinStart * (1.0f - t) + p->spinEnd * t)*dt;
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510
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511 // Change size according to given intervals:
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512 // i = 0 1 2 3 n-1
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513 // |-------|-------|------|--- ... ---|
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514 // t = 0 1/(n-1) 3/(n-1) 1
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515 //
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516 // `s' is the interpolation variable scaled to the current
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517 // interval width, e.g. if n = 5 and t = 0.3, then the current
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518 // indices are 1,2 and s = 0.3 - 0.25 = 0.05
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519 float s = p->sizeOffset + t * p->sizeIntervalSize; // size variation
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520 s *= (float)(sizes.size() - 1); // 0 <= s < sizes.size()
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521 size_t i = (size_t)s;
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522 size_t k = (i == sizes.size() - 1) ? i : i + 1; // boundary check (prevents failing on t = 1.0f)
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523 s -= (float)i; // transpose s to be in interval [0:1]: i <= s < i + 1 ~> 0 <= s < 1
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524 p->size = sizes[i] * (1.0f - s) + sizes[k] * s;
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525
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526 // Update color according to given intervals (as above)
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527 s = t * (float)(colors.size() - 1);
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528 i = (size_t)s;
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529 k = (i == colors.size() - 1) ? i : i + 1;
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530 s -= (float)i; // 0 <= s <= 1
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531 p->color = colors[i] * (1.0f - s) + colors[k] * s;
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532
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533 // Next particle.
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534 p++;
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535 }
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536 else
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537 {
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538 remove(p);
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539
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540 if (p >= pLast)
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541 return;
|
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542 } // else
|
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543 } // while
|
|
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544 }
|
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545
|
|
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546 } // opengl
|
|
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547 } // graphics
|
|
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548 } // love
|
