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1 // System & parser
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2 #include <string.h>
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3 #include <stdlib.h>
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4 #include <errno.h>
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5 #define _GNU_SOURCE
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6 #include <stdio.h>
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7 #include <sys/types.h>
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8 #include <sys/stat.h>
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9 #include <fcntl.h>
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10 #include <unistd.h>
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11
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12 // OpenGL
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13 #include "GL/glut.h"
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14
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15 #define BUF_SIZE 1024
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16
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17 int fd;
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18 //FILE* f;
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19 char *buf, *ptr;
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20
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21 void draw_poly(char* buf)
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22 {
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23 float f1, f2, f3;
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24
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25 buf += 5;
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26
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27 glBegin(GL_POLYGON);
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28 while(1) {
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29 if (sscanf(buf, "%f %f %f", &f1, &f2, &f3) != 3)
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30 break;
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31 printf("using color: %f %f %f\n", f1, f2, f3);
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32 glColor3f(f1, f2, f3);
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33
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34 if (sscanf(buf, "%f %f %f", &f1, &f2, &f3) != 3)
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35 break;
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36 printf("using vertex: %f %f %f\n", f1, f2, f3);
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37 glVertex3f(f1, f2, f3);
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38 }
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39 glEnd();
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40 }
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41
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42 void display(void)
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43 {
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44 ssize_t r;
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45
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46 do {
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47 if ((ptr) >= (buf + BUF_SIZE))
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48 break;
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49
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50 r = read(fd, ptr, 1);
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51
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52 if ((r == -1) || (r == 0) || (*ptr == '\n')) {
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53 *ptr = '\0';
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54 break;
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55 }
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56
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57 ptr += r;
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58 } while(1);
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59
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60 printf("buf = \"%s\"\n", buf);
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61 fflush(stdout);
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62
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63 /* if (!strncmp(buf, "CLEAR", 5)) {
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64 printf("clearing..\n");
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65 fflush(stdout);*/
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66 glClear(GL_COLOR_BUFFER_BIT);
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67 /* } else if (!strncmp(buf, "FLUSH", 5)) {
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68 printf("flushing..\n"); */
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69 glBegin(GL_POLYGON);
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70 glVertex3f(-0.5, -0.5, 0.5);
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71 glVertex3f(-0.5, 0.5, 0.5);
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72 glVertex3f(0.5, 0.5, 0.5);
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73 glEnd();
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74 glFlush();
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75 /* } else if (!strncmp(buf, "POLY", 4))
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76 draw_poly(buf);*/
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77 /* else {
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78 printf("unknown command\n");
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79 fflush(stdout);
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80 }*/
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81
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82 ptr = buf;
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83
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84 /* clear window */
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85
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86 /* draw unit square polygon */
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87 /*glBegin(GL_POLYGON);
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88 glVertex2f(-0.5, -0.5);
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89 glVertex2f(-0.5, 0.5);
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90 glVertex2f(0.5, 0.5);
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91 glVertex2f(0.5, -0.5);
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92 glEnd();*/
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93
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94 /* flush GL buffers */
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95 }
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96
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97
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98 void init()
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99 {
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100 /* set clear color to black */
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101 glClearColor (0.0, 0.0, 0.0, 0.0);
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102
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103 /* set fill color to white */
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104 glColor3f(1.0, 1.0, 1.0);
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105
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106 /* set up standard orthogonal view with clipping */
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107 /* box as cube of side 2 centered at origin */
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108 /* This is default view and these statement could be removed */
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109 glMatrixMode (GL_PROJECTION);
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110 glLoadIdentity ();
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111 glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
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112 }
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113
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114 #define die() __die(__FILE__, __LINE__);
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115
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116 void __die(char* f, int l)
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117 {
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118 fprintf(stderr, "Error encountered in %s:%d: %s (%d)\n", f, l, strerror(errno), errno);
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119 }
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120
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121 int main(int argc, char** argv)
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122 {
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123 unlink("/tmp/3de.pipe");
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124
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125 if ((buf = (char*) malloc(sizeof(char)*BUF_SIZE)) == NULL) {
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126 die();
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127 }
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128 ptr = buf;
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129
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130 if (mkfifo("/tmp/3de.pipe", 0777) == -1) {
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131 die();
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132 }
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133
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134 if ((fd = open("/tmp/3de.pipe", O_RDONLY | O_NONBLOCK | O_NDELAY)) == -1) {
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135 die();
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136 }
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137
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138 /*if (!(f = fdopen(fd, "r"))) {
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139 die();
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140 }*/
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141
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142 glutInit(&argc,argv);
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143 glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
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144 glutInitWindowSize(800,600);
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145 glutInitWindowPosition(0,0);
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146 glutCreateWindow("3D Engine");
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147 glutDisplayFunc(display);
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148 init();
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149 glutMainLoop();
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150
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151 close(fd);
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152
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153 return 0;
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154 }
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155
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