1 | /* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */ |
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2 | /* |
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3 | * Copyright (c) 2004-2013 HUBzero Foundation, LLC |
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4 | * |
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5 | * Authors: |
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6 | * Wei Qiao <qiaow@purdue.edu> |
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7 | */ |
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8 | |
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9 | #include <assert.h> |
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10 | #include <string.h> |
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11 | #include <stdlib.h> |
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12 | |
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13 | #include <GL/glew.h> |
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14 | |
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15 | #include <vrmath/Color4f.h> |
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16 | |
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17 | #include "ParticleRenderer.h" |
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18 | #include "define.h" |
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19 | #include "Trace.h" |
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20 | |
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21 | using namespace nv; |
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22 | |
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23 | ParticleAdvectionShader *ParticleRenderer::_advectionShader = NULL; |
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24 | ParticleAdvectionShaderInstance shaderInstance; |
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25 | |
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26 | ParticleRenderer::ParticleRenderer(int w, int h) : |
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27 | _initPosTex(0), |
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28 | _data(NULL), |
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29 | _psysFrame(0U), |
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30 | _reborn(true), |
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31 | _flip(true), |
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32 | _maxLife(500U), |
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33 | _particleSize(1.2), |
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34 | _vertexArray(NULL), |
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35 | _scale(1, 1, 1), |
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36 | _origin(0, 0, 0), |
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37 | _activate(false), |
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38 | _slicePos(0.0), |
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39 | _sliceAxis(AXIS_Z), |
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40 | _color(0.2, 0.2, 1.0, 1.0), |
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41 | _psysWidth(w), |
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42 | _psysHeight(h) |
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43 | { |
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44 | _data = new Particle[w * h]; |
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45 | memset(_data, 0, sizeof(Particle) * w * h); |
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46 | |
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47 | _vertexArray = new RenderVertexArray(_psysWidth * _psysHeight, 3, GL_FLOAT); |
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48 | |
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49 | assert(CheckGL(AT)); |
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50 | |
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51 | glGenFramebuffersEXT(2, _psysFbo); |
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52 | glGenTextures(2, _psysTex); |
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53 | |
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54 | int fboOrig; |
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55 | glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &fboOrig); |
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56 | |
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57 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _psysFbo[0]); |
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58 | |
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59 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _psysTex[0]); |
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60 | glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
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61 | glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
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62 | |
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63 | #ifdef HAVE_FLOAT_TEXTURES |
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64 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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65 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, NULL); |
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66 | #else |
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67 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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68 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, NULL); |
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69 | #endif |
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70 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, |
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71 | GL_TEXTURE_RECTANGLE_ARB, _psysTex[0], 0); |
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72 | |
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73 | CHECK_FRAMEBUFFER_STATUS(); |
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74 | |
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75 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _psysFbo[1]); |
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76 | |
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77 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _psysTex[1]); |
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78 | glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
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79 | glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
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80 | #ifdef HAVE_FLOAT_TEXTURES |
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81 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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82 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, NULL); |
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83 | #else |
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84 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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85 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, NULL); |
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86 | #endif |
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87 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, |
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88 | GL_TEXTURE_RECTANGLE_ARB, _psysTex[1], 0); |
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89 | |
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90 | CHECK_FRAMEBUFFER_STATUS(); |
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91 | |
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92 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboOrig); |
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93 | |
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94 | glGenTextures(1, &_initPosTex); |
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95 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _initPosTex); |
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96 | glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
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97 | glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
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98 | #ifdef HAVE_FLOAT_TEXTURES |
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99 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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100 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, NULL); |
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101 | #else |
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102 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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103 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, NULL); |
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104 | #endif |
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105 | |
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106 | if (_advectionShader == NULL) { |
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107 | _advectionShader = new ParticleAdvectionShader(); |
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108 | } |
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109 | } |
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110 | |
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111 | ParticleRenderer::~ParticleRenderer() |
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112 | { |
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113 | glDeleteTextures(1, &_initPosTex); |
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114 | |
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115 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _psysFbo[0]); |
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116 | glDeleteTextures(1, _psysTex); |
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117 | |
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118 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _psysFbo[1]); |
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119 | glDeleteTextures(1, _psysTex+1); |
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120 | |
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121 | glDeleteFramebuffersEXT(2, _psysFbo); |
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122 | |
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123 | delete _vertexArray; |
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124 | delete [] _data; |
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125 | } |
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126 | |
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127 | void |
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128 | ParticleRenderer::initializeDataArray() |
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129 | { |
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130 | size_t n = _psysWidth * _psysHeight * 4; |
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131 | memset(_data, 0, sizeof(float)* n); |
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132 | |
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133 | int index; |
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134 | bool particle; |
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135 | float *p = (float *)_data; |
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136 | for (int i = 0; i < _psysWidth; i++) { |
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137 | for (int j = 0; j < _psysHeight; j++) { |
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138 | index = i + _psysHeight*j; |
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139 | particle = (rand() % 256) > 150; |
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140 | if (particle) { |
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141 | //assign any location (x,y,z) in range [0,1] |
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142 | switch (_sliceAxis) { |
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143 | case 0: |
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144 | p[4*index] = _slicePos; |
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145 | p[4*index+1] = j/float(_psysHeight); |
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146 | p[4*index+2] = i/float(_psysWidth); |
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147 | break; |
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148 | case 1: |
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149 | p[4*index] = j/float(_psysHeight); |
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150 | p[4*index+1] = _slicePos; |
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151 | p[4*index+2] = i/float(_psysWidth); |
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152 | break; |
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153 | case 2: |
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154 | p[4*index] = j/float(_psysHeight); |
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155 | p[4*index+1] = i/float(_psysWidth); |
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156 | p[4*index+2] = _slicePos; |
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157 | break; |
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158 | default: |
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159 | p[4*index] = 0; |
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160 | p[4*index+1] = 0; |
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161 | p[4*index+2] = 0; |
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162 | p[4*index+3] = 0; |
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163 | } |
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164 | |
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165 | //shorter life span, quicker iterations |
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166 | p[4*index+3] = rand() / ((float) RAND_MAX) * 0.5 + 0.5f; |
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167 | } else { |
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168 | p[4*index] = 0; |
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169 | p[4*index+1] = 0; |
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170 | p[4*index+2] = 0; |
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171 | p[4*index+3] = 0; |
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172 | } |
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173 | } |
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174 | } |
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175 | } |
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176 | |
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177 | void |
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178 | ParticleRenderer::initialize() |
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179 | { |
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180 | initializeDataArray(); |
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181 | |
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182 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _psysTex[0]); |
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183 | #ifdef HAVE_FLOAT_TEXTURES |
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184 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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185 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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186 | #else |
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187 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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188 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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189 | #endif |
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190 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0); |
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191 | |
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192 | _flip = true; |
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193 | _reborn = false; |
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194 | |
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195 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _initPosTex); |
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196 | #ifdef HAVE_FLOAT_TEXTURES |
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197 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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198 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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199 | #else |
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200 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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201 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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202 | #endif |
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203 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0); |
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204 | |
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205 | TRACE("Leave"); |
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206 | } |
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207 | |
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208 | void |
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209 | ParticleRenderer::reset() |
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210 | { |
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211 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _psysTex[0]); |
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212 | #ifdef HAVE_FLOAT_TEXTURES |
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213 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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214 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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215 | #else |
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216 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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217 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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218 | #endif |
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219 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0); |
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220 | _flip = true; |
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221 | _reborn = false; |
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222 | _psysFrame = 0U; |
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223 | } |
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224 | |
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225 | void |
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226 | ParticleRenderer::advect() |
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227 | { |
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228 | if (_reborn) |
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229 | reset(); |
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230 | |
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231 | glPushAttrib(GL_VIEWPORT_BIT | GL_ENABLE_BIT); |
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232 | |
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233 | int fboOrig; |
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234 | glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &fboOrig); |
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235 | |
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236 | glDisable(GL_BLEND); |
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237 | glDisable(GL_DEPTH_TEST); |
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238 | |
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239 | int fbo, tex; |
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240 | if (_flip) { |
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241 | fbo = 1; |
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242 | tex = 0; |
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243 | } else { |
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244 | fbo = 0; |
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245 | tex = 1; |
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246 | } |
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247 | |
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248 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _psysFbo[fbo]); |
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249 | glEnable(GL_TEXTURE_RECTANGLE_ARB); |
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250 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _psysTex[tex]); |
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251 | |
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252 | glClear(GL_COLOR_BUFFER_BIT); |
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253 | |
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254 | glViewport(0, 0, _psysWidth, _psysHeight); |
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255 | glMatrixMode(GL_PROJECTION); |
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256 | glPushMatrix(); |
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257 | glLoadIdentity(); |
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258 | //gluOrtho2D(0, _psysWidth, 0, _psysHeight); |
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259 | glOrtho(0, _psysWidth, 0, _psysHeight, -10.0f, 10.0f); |
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260 | glMatrixMode(GL_MODELVIEW); |
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261 | glPushMatrix(); |
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262 | glLoadIdentity(); |
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263 | |
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264 | _advectionShader->bind(_psysTex[tex], _initPosTex); |
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265 | |
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266 | draw_quad(_psysWidth, _psysHeight, _psysWidth, _psysHeight); |
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267 | |
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268 | _advectionShader->unbind(); |
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269 | |
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270 | glMatrixMode(GL_PROJECTION); |
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271 | glPopMatrix(); |
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272 | |
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273 | glMatrixMode(GL_MODELVIEW); |
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274 | glPopMatrix(); |
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275 | |
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276 | glDisable(GL_TEXTURE_RECTANGLE_ARB); |
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277 | |
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278 | updateVertexBuffer(); |
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279 | |
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280 | _flip = (!_flip); |
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281 | |
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282 | _psysFrame++; |
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283 | if (_psysFrame == _maxLife) { |
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284 | _psysFrame = 0U; |
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285 | // _reborn = true; |
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286 | } |
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287 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboOrig); |
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288 | |
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289 | glPopAttrib(); |
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290 | } |
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291 | |
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292 | void |
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293 | ParticleRenderer::updateVertexBuffer() |
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294 | { |
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295 | _vertexArray->read(_psysWidth, _psysHeight); |
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296 | |
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297 | //_vertexArray->loadData(vert); //does not work?? |
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298 | //assert(glGetError()==0); |
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299 | } |
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300 | |
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301 | void |
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302 | ParticleRenderer::render() |
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303 | { |
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304 | glPushAttrib(GL_ENABLE_BIT); |
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305 | glDisable(GL_TEXTURE_2D); |
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306 | glDisable(GL_BLEND); |
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307 | glEnable(GL_DEPTH_TEST); |
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308 | |
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309 | glEnable(GL_COLOR_MATERIAL); |
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310 | |
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311 | glMatrixMode(GL_MODELVIEW); |
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312 | glPushMatrix(); |
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313 | |
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314 | glTranslatef(_origin.x, _origin.y, _origin.z); |
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315 | glScaled(_scale.x, _scale.y, _scale.z); |
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316 | |
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317 | glPointSize(_particleSize); |
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318 | glColor4f(_color.x, _color.y, _color.z, _color.w); |
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319 | |
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320 | glEnableClientState(GL_VERTEX_ARRAY); |
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321 | _vertexArray->setPointer(0); |
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322 | glDrawArrays(GL_POINTS, 0, _psysWidth * _psysHeight); |
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323 | glDisableClientState(GL_VERTEX_ARRAY); |
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324 | |
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325 | glPopMatrix(); |
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326 | glPopAttrib(); |
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327 | } |
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328 | |
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329 | void |
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330 | ParticleRenderer::setVectorField(unsigned int texID, const vrmath::Vector3f& origin, |
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331 | float scaleX, float scaleY, float scaleZ, |
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332 | float max) |
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333 | { |
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334 | _origin = origin; |
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335 | _scale.set(scaleX, scaleY, scaleZ); |
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336 | _advectionShader->setScale(_scale); |
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337 | _advectionShader->setVelocityVolume(texID, max); |
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338 | } |
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339 | |
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340 | void |
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341 | ParticleRenderer::setSliceAxis(FlowSliceAxis axis) |
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342 | { |
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343 | _sliceAxis = axis; |
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344 | initializeDataArray(); |
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345 | } |
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346 | |
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347 | void |
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348 | ParticleRenderer::setSlicePosition(float pos) |
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349 | { |
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350 | _slicePos = pos; |
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351 | initializeDataArray(); |
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352 | } |
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