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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <assert.h>
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4 #include <errno.h>
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5 #include <unistd.h>
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6 #include <sys/select.h>
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7 #include <GL/glew.h>
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8 #include <X11/Xlib.h>
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9 #include <GL/glx.h>
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10
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11 static bool init();
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12 static void cleanup();
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13 static void display();
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14 static void keyb(int key, bool pressed);
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15 static void mouse(int bn, bool pressed, int x, int y);
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16 static void motion(int x, int y);
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17
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18 static Window create_window(const char *title, int xsz, int ysz);
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19 static void process_events();
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20 static int translate_keysym(KeySym sym);
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21
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22 static Display *dpy;
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23 static Window win;
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24 static GLXContext ctx;
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25 static Atom xa_wm_prot, xa_wm_del_win;
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26
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27 static int win_width, win_height;
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28
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29 static bool redisplay_pending;
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30 static bool win_mapped;
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31
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32 int main()
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33 {
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34 if(!init()) {
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35 fprintf(stderr, "X11/OpenGL initialization failed\n");
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36 return 1;
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37 }
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38 atexit(cleanup);
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39
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40 int xfd = ConnectionNumber(dpy);
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41
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42 for(;;) {
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43 fd_set rd;
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44 FD_ZERO(&rd);
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45
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46 FD_SET(xfd, &rd);
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47
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48 while(select(xfd + 1, &rd, 0, 0, 0) == -1 && errno == EINTR);
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49
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50 if(FD_ISSET(xfd, &rd)) {
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51 process_events();
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52 }
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53
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54 if(redisplay_pending) {
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55 display();
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56 redisplay_pending = false;
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57 }
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58 }
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59 return 0;
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60 }
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61
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62 static bool init()
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63 {
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64 if(!(dpy = XOpenDisplay(0))) {
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65 fprintf(stderr, "failed to connect to the X server!\n");
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66 return false;
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67 }
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68
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69 if(!(win = create_window("dummy equeue device", 800, 600))) {
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70 return false;
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71 }
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72
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73 return true;
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74 }
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75
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76 static void cleanup()
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77 {
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78 if(!dpy) return;
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79
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80 if(win) {
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81 XDestroyWindow(dpy, win);
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82 }
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83 XCloseDisplay(dpy);
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84 }
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85
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86 static void display()
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87 {
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88 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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89
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90 glMatrixMode(GL_MODELVIEW);
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91 glLoadIdentity();
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92
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93 glXSwapBuffers(dpy, win);
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94 assert(glGetError() == GL_NO_ERROR);
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95 }
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96
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97 static void reshape(int x, int y)
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98 {
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99 glViewport(0, 0, x, y);
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100
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101 glMatrixMode(GL_PROJECTION);
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102 glLoadIdentity();
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103 gluPerspective(50.0, (float)x / (float)y, 0.5, 500.0);
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104 }
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105
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106 static void keyb(int key, bool pressed)
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107 {
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108 if(pressed) {
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109 switch(key) {
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110 case 27:
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111 exit(0);
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112 }
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113 }
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114 }
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115
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116 static void mouse(int bn, bool pressed, int x, int y)
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117 {
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118 }
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119
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120 static void motion(int x, int y)
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121 {
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122 }
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123
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124 static Window create_window(const char *title, int xsz, int ysz)
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125 {
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126 int scr = DefaultScreen(dpy);
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127 Window root = RootWindow(dpy, scr);
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128
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129 int glxattr[] = {
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130 GLX_RGBA,
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131 GLX_RED_SIZE, 8,
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132 GLX_GREEN_SIZE, 8,
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133 GLX_BLUE_SIZE, 8,
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134 GLX_DEPTH_SIZE, 24,
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135 GLX_DOUBLEBUFFER,
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136 #if defined(GLX_VERSION_1_4) || defined(GLX_ARB_multisample)
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137 GLX_SAMPLE_BUFFERS_ARB, 1,
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138 GLX_SAMPLES_ARB, 1,
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139 #endif
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140 None
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141 };
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142
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143 XVisualInfo *vis = glXChooseVisual(dpy, scr, glxattr);
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144 if(!vis) {
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145 fprintf(stderr, "failed to find a suitable visual\n");
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146 return 0;
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147 }
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148
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149 if(!(ctx = glXCreateContext(dpy, vis, 0, True))) {
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150 fprintf(stderr, "failed to create OpenGL context\n");
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151 XFree(vis);
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152 return -1;
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153 }
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154
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155 XSetWindowAttributes xattr;
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156 xattr.background_pixel = xattr.border_pixel = BlackPixel(dpy, scr);
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157 xattr.colormap = XCreateColormap(dpy, root, vis->visual, AllocNone);
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158 unsigned int xattr_mask = CWColormap | CWBackPixel | CWBorderPixel;
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159
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160 Window win = XCreateWindow(dpy, root, 0, 0, xsz, ysz, 0, vis->depth, InputOutput,
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161 vis->visual, xattr_mask, &xattr);
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162 if(!win) {
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163 fprintf(stderr, "failed to create window\n");
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164 glXDestroyContext(dpy, ctx);
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165 XFree(vis);
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166 return -1;
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167 }
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168 XFree(vis);
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169
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170 unsigned int evmask = StructureNotifyMask | VisibilityChangeMask | ExposureMask |
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171 KeyPressMask | KeyReleaseMask | ButtonPressMask | ButtonReleaseMask |
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172 ButtonMotionMask | PointerMotionMask;
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173 XSelectInput(dpy, win, evmask);
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174
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175 xa_wm_prot = XInternAtom(dpy, "WM_PROTOCOLS", False);
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176 xa_wm_del_win = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
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177 XSetWMProtocols(dpy, win, &xa_wm_del_win, 1);
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178
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179 XClassHint hint;
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180 hint.res_name = hint.res_class = (char*)"equeue_win";
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181 XSetClassHint(dpy, win, &hint);
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182
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183 XTextProperty wm_name;
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184 XStringListToTextProperty((char**)&title, 1, &wm_name);
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185 XSetWMName(dpy, win, &wm_name);
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186 XSetWMIconName(dpy, win, &wm_name);
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187 XFree(wm_name.value);
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188
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189 XMapWindow(dpy, win);
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190 glXMakeCurrent(dpy, win, ctx);
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191
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192 return win;
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193 }
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194
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195 static void process_events()
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196 {
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197 XEvent ev;
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198
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199 while(XPending(dpy)) {
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200 XNextEvent(dpy, &ev);
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201 switch(ev.type) {
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202 case MapNotify:
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203 win_mapped = true;
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204 break;
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205
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206 case UnmapNotify:
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207 win_mapped = false;
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208 break;
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209
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210 case Expose:
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211 if(win_mapped && ev.xexpose.count == 0) {
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212 redisplay_pending = 1;
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213 }
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214 break;
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215
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216 case MotionNotify:
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217 motion(ev.xmotion.x, ev.xmotion.y);
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218 break;
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219
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220 case ButtonPress:
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221 mouse(ev.xbutton.button - 1, true, ev.xbutton.x, ev.xbutton.y);
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222 break;
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223
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224 case ButtonRelease:
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225 mouse(ev.xbutton.button - 1, false, ev.xbutton.x, ev.xbutton.y);
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226 break;
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227
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228 case KeyPress:
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229 {
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230 KeySym sym = XLookupKeysym(&ev.xkey, 0);
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231 keyb(translate_keysym(sym), true);
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232 }
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233 break;
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234
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235 case KeyRelease:
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236 {
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237 KeySym sym = XLookupKeysym(&ev.xkey, 0);
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238 keyb(translate_keysym(sym), false);
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239 }
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240 break;
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241
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242 case ConfigureNotify:
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243 {
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244 int xsz = ev.xconfigure.width;
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245 int ysz = ev.xconfigure.height;
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246
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247 if(xsz != win_width || ysz != win_height) {
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248 win_width = xsz;
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249 win_height = ysz;
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250 reshape(xsz, ysz);
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251 }
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252 }
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253 break;
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254
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255 case ClientMessage:
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256 if(ev.xclient.message_type == xa_wm_prot) {
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257 if((Atom)ev.xclient.data.l[0] == xa_wm_del_win) {
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258 exit(0);
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259 }
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260 }
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261 break;
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262
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263 default:
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264 break;
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265 }
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266
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267 }
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268 }
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269
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270 static int translate_keysym(KeySym sym)
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271 {
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272 switch(sym) {
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273 case XK_BackSpace:
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274 return '\b';
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275 case XK_Tab:
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276 return '\t';
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277 case XK_Linefeed:
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278 return '\r';
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279 case XK_Return:
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280 return '\n';
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281 case XK_Escape:
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282 return 27;
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283 default:
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284 break;
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285 }
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286 return (int)sym;
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287 }
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