1 | /*
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2 | * ----------------------------------------------------------------------
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3 | * ParticleSystem.cpp: particle system class
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4 | *
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5 | * ======================================================================
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6 | * AUTHOR: Wei Qiao <qiaow@purdue.edu>
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7 | * Purdue Rendering and Perceptualization Lab (PURPL)
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8 | *
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9 | * Copyright (c) 2004-2006 Purdue Research Foundation
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10 | *
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11 | * See the file "license.terms" for information on usage and
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12 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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13 | * ======================================================================
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14 | */
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15 |
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16 | #include <stdio.h>
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17 | #include <assert.h>
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18 | #include <malloc.h>
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19 | #include <string.h>
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20 |
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21 | #include "ParticleSystem.h"
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22 |
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23 |
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24 | ParticleSystem::ParticleSystem(int w, int h, CGcontext context, NVISid volume, float scale_x,
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25 | float scale_y, float scale_z){
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26 |
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27 | fprintf(stderr, "%f, %f, %f\n", scale_x, scale_y, scale_z);
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28 | scale = Vector3(scale_x, scale_y, scale_z);
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29 |
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30 | psys_width = w;
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31 | psys_height = h;
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32 |
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33 | psys_frame = 0;
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34 | reborn = true;
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35 | flip = true;
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36 | max_life = 500;
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37 |
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38 | data = (Particle*) malloc(w*h*sizeof(Particle));
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39 |
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40 | m_vertex_array = new RenderVertexArray(psys_width*psys_height, 3, GL_FLOAT);
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41 | assert(glGetError()==0);
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42 |
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43 | glGenFramebuffersEXT(2, psys_fbo);
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44 | glGenTextures(2, psys_tex);
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45 |
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46 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, psys_fbo[0]);
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47 |
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48 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, psys_tex[0]);
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49 | glTexParameterf(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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50 | glTexParameterf(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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51 | glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_FLOAT_RGBA32_NV, psys_width, psys_height, 0, GL_RGBA, GL_FLOAT, NULL);
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52 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_RECTANGLE_NV, psys_tex[0], 0);
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53 |
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54 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, psys_fbo[1]);
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55 |
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56 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, psys_tex[1]);
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57 | glTexParameterf(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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58 | glTexParameterf(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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59 | glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_FLOAT_RGBA32_NV, psys_width, psys_height, 0, GL_RGBA, GL_FLOAT, NULL);
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60 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_RECTANGLE_NV, psys_tex[1], 0);
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61 |
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62 | CHECK_FRAMEBUFFER_STATUS();
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63 | assert(glGetError()==0);
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64 |
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65 | //load related shaders
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66 | m_g_context = context;
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67 |
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68 | m_pos_fprog = loadProgram(m_g_context, CG_PROFILE_FP30, CG_SOURCE, "/opt/nanovis/lib/shaders/update_pos.cg");
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69 | m_pos_timestep_param = cgGetNamedParameter(m_pos_fprog, "timestep");
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70 | m_vel_tex_param = cgGetNamedParameter(m_pos_fprog, "vel_tex");
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71 | m_pos_tex_param = cgGetNamedParameter(m_pos_fprog, "pos_tex");
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72 | m_scale_param = cgGetNamedParameter(m_pos_fprog, "scale");
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73 | cgGLSetTextureParameter(m_vel_tex_param, volume);
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74 | cgGLSetParameter3f(m_scale_param, scale_x, scale_y, scale_z);
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75 |
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76 | fprintf(stderr, "init_psys\n");
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77 | }
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78 |
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79 |
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80 | ParticleSystem::~ParticleSystem(){
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81 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, psys_fbo[0]);
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82 | glDeleteTextures(1, psys_tex);
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83 |
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84 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, psys_fbo[1]);
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85 | glDeleteTextures(1, psys_tex+1);
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86 |
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87 | glDeleteFramebuffersEXT(2, psys_fbo);
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88 |
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89 | free(data);
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90 | }
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91 |
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92 |
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93 | void ParticleSystem::initialize(Particle* p){
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94 | //also store the data on main memory for next initialization
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95 | memcpy(data, p, psys_width*psys_height*sizeof(Particle));
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96 |
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97 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, psys_tex[0]);
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98 | glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_FLOAT_RGBA32_NV, psys_width, psys_height, 0, GL_RGBA, GL_FLOAT, (float*)p);
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99 |
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100 | assert(glGetError()==0);
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101 |
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102 | flip = true;
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103 | reborn = false;
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104 |
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105 | //fprintf(stderr, "init particles\n");
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106 | }
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107 |
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108 | void ParticleSystem::reset(){
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109 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, psys_tex[0]);
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110 | glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_FLOAT_RGBA32_NV, psys_width, psys_height, 0, GL_RGBA, GL_FLOAT, (float*)data);
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111 |
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112 | assert(glGetError()==0);
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113 |
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114 | flip = true;
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115 | reborn = false;
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116 | psys_frame = 0;
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117 | }
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118 |
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119 |
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120 | void ParticleSystem::advect(){
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121 | if(reborn) reset();
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122 |
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123 | glDisable(GL_BLEND);
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124 |
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125 | if(flip){
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126 |
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127 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, psys_fbo[1]);
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128 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, psys_tex[0]);
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129 |
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130 | glClear(GL_COLOR_BUFFER_BIT);
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131 |
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132 | glViewport(0, 0, psys_width, psys_height);
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133 | glMatrixMode(GL_PROJECTION);
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134 | glLoadIdentity();
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135 | gluOrtho2D(0, psys_width, 0, psys_height);
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136 | glMatrixMode(GL_MODELVIEW);
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137 | glLoadIdentity();
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138 |
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139 | cgGLBindProgram(m_pos_fprog);
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140 | cgGLSetParameter1f(m_pos_timestep_param, 0.05);
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141 | cgGLEnableTextureParameter(m_vel_tex_param);
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142 | cgGLSetTextureParameter(m_pos_tex_param, psys_tex[0]);
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143 | cgGLEnableTextureParameter(m_pos_tex_param);
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144 |
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145 | cgGLEnableProfile(CG_PROFILE_FP30);
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146 | draw_quad(psys_width, psys_height, psys_width, psys_height);
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147 | cgGLDisableProfile(CG_PROFILE_FP30);
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148 |
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149 | cgGLDisableTextureParameter(m_vel_tex_param);
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150 | cgGLDisableTextureParameter(m_pos_tex_param);
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151 | }
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152 | else
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153 | {
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154 |
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155 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, psys_fbo[0]);
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156 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, psys_tex[1]);
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157 |
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158 | glClear(GL_COLOR_BUFFER_BIT);
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159 |
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160 | glViewport(0, 0, psys_width, psys_height);
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161 | glMatrixMode(GL_PROJECTION);
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162 | glLoadIdentity();
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163 | gluOrtho2D(0, psys_width, 0, psys_height);
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164 | glMatrixMode(GL_MODELVIEW);
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165 | glLoadIdentity();
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166 |
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167 | cgGLBindProgram(m_pos_fprog);
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168 | cgGLSetParameter1f(m_pos_timestep_param, 0.05);
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169 | cgGLEnableTextureParameter(m_vel_tex_param);
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170 | cgGLSetTextureParameter(m_pos_tex_param, psys_tex[1]);
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171 | cgGLEnableTextureParameter(m_pos_tex_param);
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172 |
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173 | cgGLEnableProfile(CG_PROFILE_FP30);
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174 | draw_quad(psys_width, psys_height, psys_width, psys_height);
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175 | cgGLDisableProfile(CG_PROFILE_FP30);
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176 |
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177 | cgGLDisableTextureParameter(m_vel_tex_param);
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178 | cgGLDisableTextureParameter(m_pos_tex_param);
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179 | }
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180 |
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181 | assert(glGetError()==0);
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182 |
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183 | //soft_read_verts();
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184 | update_vertex_buffer();
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185 |
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186 | flip = (!flip);
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187 |
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188 | psys_frame++;
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189 | if(psys_frame==max_life){
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190 | psys_frame=0;
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191 | reborn = true;
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192 | }
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193 |
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194 | //fprintf(stderr, "advect: %d ", psys_frame);
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195 | }
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196 |
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197 |
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198 | void ParticleSystem::update_vertex_buffer(){
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199 | m_vertex_array->Read(psys_width, psys_height);
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200 | //m_vertex_array->LoadData(vert); //does not work??
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201 | assert(glGetError()==0);
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202 | }
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203 |
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204 |
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205 | void ParticleSystem::render(){ display_vertices(); }
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206 |
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207 | void ParticleSystem::display_vertices(){
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208 | glDisable(GL_TEXTURE_2D);
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209 | glDisable(GL_BLEND);
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210 | glEnable(GL_DEPTH_TEST);
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211 |
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212 | glPointSize(1.2);
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213 | glColor4f(.2,.2,.8,1.);
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214 |
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215 | glPushMatrix();
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216 | glScaled(1./scale.x, 1./scale.y, 1./scale.z);
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217 |
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218 | m_vertex_array->SetPointer(0);
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219 | //glEnableVertexAttribArray(0);
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220 | glEnableClientState(GL_VERTEX_ARRAY);
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221 | glDrawArrays(GL_POINTS, 0, psys_width*psys_height);
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222 | //glDisableVertexAttribArray(0);
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223 | glDisableClientState(GL_VERTEX_ARRAY);
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224 |
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225 | glPopMatrix();
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226 |
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227 | glDisable(GL_DEPTH_TEST);
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228 | assert(glGetError()==0);
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229 | }
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230 |
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231 |
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