1 | #include "NBody.hpp" |
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2 | |
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3 | extern int numBodies; // No. of particles; |
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4 | extern void* me; // Pointing to NBody class; |
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5 | |
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6 | bool rotate = false; |
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7 | bool translateW = false; |
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8 | bool translateZ = false; |
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9 | |
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10 | //-------------------------------- |
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11 | // PROTOTIPE FUNCTIONS |
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12 | |
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13 | void GLInit(); |
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14 | void idle(); |
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15 | void reShape(int w,int h); |
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16 | void displayfunc(); |
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17 | void keyboardFunc(unsigned char key, int mouseX, int mouseY); |
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18 | |
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19 | /////////////////////////////////// startOpenGLSimulation Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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20 | // |
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21 | // This function is called to display the simulation in |
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22 | // OpenGL. If "display" variable is not TRUE then the |
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23 | // simulation in OpenGL will not take place. |
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24 | // |
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25 | /////////////////////////////////// startOpenGLSimulation Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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26 | |
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27 | void startOpenGLSimulation(int argc, char * argv[]) |
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28 | { |
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29 | char * windowName = (char*)malloc(1024); |
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30 | |
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31 | sprintf (windowName, "NBody simulation : %d particles", numBodies); |
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32 | |
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33 | |
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34 | if(displayOpenGL) |
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35 | { |
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36 | // Run in graphical window if requested |
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37 | glutInit(&argc, argv); |
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38 | glutInitWindowPosition(100,10); |
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39 | glutInitWindowSize(600,600); |
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40 | glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); |
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41 | glutCreateWindow(windowName); |
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42 | GLInit(); |
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43 | glutDisplayFunc(displayfunc); |
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44 | glutReshapeFunc(reShape); |
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45 | glutIdleFunc(idle); |
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46 | glutKeyboardFunc(keyboardFunc); |
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47 | |
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48 | free(windowName); |
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49 | |
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50 | try { |
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51 | glutMainLoop(); |
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52 | } |
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53 | catch( char * str ) { |
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54 | std::cout << "OpenGL exited." << std::endl; |
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55 | } |
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56 | }else{ |
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57 | free(windowName); |
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58 | } |
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59 | } |
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60 | |
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61 | /////////////////////////////////// GLInit Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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62 | // |
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63 | // Initialize OpenGL related stuff. |
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64 | // |
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65 | /////////////////////////////////// GLInit Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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66 | |
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67 | void GLInit() |
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68 | { |
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69 | glClearColor(0.0 ,0.0, 0.0, 0.0); |
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70 | glClear(GL_COLOR_BUFFER_BIT); |
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71 | glClear(GL_DEPTH_BUFFER_BIT); |
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72 | glMatrixMode(GL_PROJECTION); |
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73 | glLoadIdentity(); |
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74 | } |
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75 | |
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76 | /////////////////////////////////// idle Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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77 | // |
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78 | // Glut Idle function. |
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79 | // |
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80 | /////////////////////////////////// idle Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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81 | |
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82 | void idle() |
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83 | { |
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84 | // If it's time to take a snapshot: |
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85 | if (takeSnapshots == TAKE_SNAPSHOTS){ |
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86 | if (((NBody*)me)->curr_time_step > ((NBody*)me)->curr_snap_time){ |
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87 | ((NBody*)me)->curr_snap_time += ((NBody*)me)->dt_snap; |
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88 | ((NBody*)me)->put_snapshot(); |
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89 | } |
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90 | } |
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91 | |
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92 | // If it's time to take a diagnostication: |
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93 | if (takeDiagnostics == TAKE_DIAGNOSTICS){ |
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94 | if (((NBody*)me)->curr_time_step > ((NBody*)me)->curr_diag_time){ |
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95 | ((NBody*)me)->curr_diag_time += ((NBody*)me)->dt_diag; |
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96 | ((NBody*)me)->write_diagnostics(); |
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97 | //std::cout << "Current time: " << ((NBody*)me)->curr_time_step << std::endl; |
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98 | } |
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99 | |
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100 | // If it's the first step in the simulation compute |
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101 | // the initial total energy of the system: |
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102 | if (((NBody*)me)->taken_steps == 0){ |
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103 | ((NBody*)me)->write_diagnostics(); |
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104 | } |
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105 | } |
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106 | |
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107 | if (((NBody*)me)->curr_time_step > ((NBody*)me)->curr_diag_time){ |
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108 | ((NBody*)me)->curr_diag_time += ((NBody*)me)->dt_diag; |
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109 | std::cout << "Current time: " << ((NBody*)me)->curr_time_step << std::endl; |
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110 | } |
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111 | |
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112 | // If it is not the end of the simulation: |
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113 | if (((NBody*)me)->curr_time_step < ((NBody*)me)->end_time){ |
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114 | |
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115 | // Move one step foreward (a step = delT): |
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116 | ((NBody*)me)->curr_time_step += ((NBody*)me)->delT; |
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117 | |
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118 | // Increase the number of steps by now: |
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119 | ((NBody*)me)->taken_steps++; |
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120 | |
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121 | //if (((NBody*)me)->taken_steps == 1800) |
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122 | // std::cout << "some test beep here \a\n"; |
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123 | |
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124 | //std::cout << |
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125 | |
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126 | }else{ |
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127 | std::cout << std::endl; |
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128 | std::cout << "Simulation ended..." << std::endl; |
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129 | std::cout << std::endl; |
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130 | time ( &rawtime ); |
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131 | timeinfo = localtime ( &rawtime ); |
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132 | std::cout << "End time and date: " << asctime (timeinfo) << std::endl; |
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133 | std::cout << "============================" << std::endl; |
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134 | |
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135 | exit(1); |
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136 | } |
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137 | |
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138 | glutPostRedisplay(); |
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139 | } |
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140 | |
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141 | /////////////////////////////////// reShape Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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142 | // |
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143 | // Glut reshape function. |
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144 | // @param w width of OpenGL window |
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145 | // @param h height of OpenGL window |
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146 | // |
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147 | /////////////////////////////////// reShape Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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148 | |
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149 | void reShape(int w,int h) |
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150 | { |
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151 | glViewport(0,0,w,h); |
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152 | |
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153 | glViewport(0,0,w,h); |
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154 | glMatrixMode(GL_MODELVIEW); |
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155 | glLoadIdentity(); |
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156 | gluPerspective(45.0f,w/h,1.0f,1000.0f); |
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157 | gluLookAt (0.0, 0.0, -2.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0); |
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158 | } |
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159 | |
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160 | /////////////////////////////////// displayfunc Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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161 | // |
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162 | // OpenGL display function. |
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163 | // |
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164 | /////////////////////////////////// displayfunc Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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165 | |
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166 | void displayfunc() |
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167 | { |
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168 | glClearColor(0.0 ,0.0, 0.0, 0.0); |
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169 | glClear(GL_COLOR_BUFFER_BIT); |
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170 | glClear(GL_DEPTH_BUFFER_BIT); |
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171 | |
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172 | glPointSize(1.0); |
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173 | glBlendFunc(GL_SRC_ALPHA, GL_ONE); |
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174 | glEnable(GL_BLEND); |
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175 | glDepthMask(GL_FALSE); |
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176 | |
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177 | glColor3f(1.0f,0.6f,0.0f); |
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178 | |
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179 | //------------------------ |
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180 | // Run the kernel on the choosen device: |
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181 | if (((NBody*)me)->curr_time_step < ((NBody*)me)->end_time){ |
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182 | //Calling kernel for calculatig subsequent positions |
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183 | if (integrator == LEAPFROG){ |
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184 | ((NBody*)me)->runCLKernelLeapfrog(); |
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185 | }else{ |
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186 | ((NBody*)me)->runCLKernels(); |
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187 | } |
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188 | } |
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189 | |
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190 | //------------------------ |
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191 | // After running the kernel we have the new updated positions: |
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192 | |
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193 | if (rotate){ |
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194 | glRotatef(25, 0, 1, 0); |
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195 | rotate = false; |
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196 | } |
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197 | if (translateW){ |
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198 | glTranslatef(0, 0, 1); |
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199 | translateW = false; |
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200 | } |
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201 | |
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202 | if (translateZ){ |
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203 | glTranslatef(0, 0, -1); |
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204 | translateZ = false; |
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205 | } |
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206 | |
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207 | glBegin(GL_POINTS); |
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208 | for(int i=0; i < numBodies; ++i) |
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209 | { |
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210 | //divided by 300 just for scaling |
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211 | glVertex3d( ((NBody*)me)->pos[i*4+ 0]/300, |
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212 | ((NBody*)me)->pos[i*4+1]/300, |
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213 | ((NBody*)me)->pos[i*4+2]/300); |
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214 | } |
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215 | glEnd(); |
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216 | |
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217 | glFlush(); |
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218 | glutSwapBuffers(); |
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219 | } |
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220 | |
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221 | /////////////////////////////////// keyboardFunc Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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222 | // |
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223 | // OpenGL keyboard function. |
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224 | // |
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225 | /////////////////////////////////// keyboardFunc Func \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ |
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226 | |
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227 | void keyboardFunc(unsigned char key, int mouseX, int mouseY) |
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228 | { |
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229 | switch(key) |
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230 | { |
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231 | /* If the user hits escape or Q, then exit */ |
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232 | /* ESCAPE_KEY = 27 */ |
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233 | case 27: |
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234 | case 'r': rotate = true; |
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235 | glutPostRedisplay(); |
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236 | break; |
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237 | case 'w': translateW = true; |
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238 | glutPostRedisplay(); |
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239 | break; |
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240 | case 'z': translateZ = true; |
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241 | glutPostRedisplay(); |
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242 | break; |
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243 | |
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244 | case 'q': |
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245 | case 'Q': |
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246 | { |
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247 | if(((NBody*)me)->cleanup() != 0) // SDK_SUCCESS == 0; |
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248 | exit(1); |
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249 | else |
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250 | exit(0); |
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251 | } |
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252 | default: |
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253 | break; |
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254 | } |
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255 | } |
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256 | |
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